Illiteracy as Third World Problem Essay

It is true that illiteracy is becoming a serious problem in industrialised nations. This is surprising as most people think that this is a problem only in under-developed nations such as in parts of Africa and India. Illiteracy is related to many other problems such as poverty, over-population and governmental corruption. Let us take a more detailed look at the causes of this growing problem in many Western nations. One of the most obvious reasons for the increase in illiteracy is the advent of television. Children no longer have to read to obtain information. Neither do they have to read to relax. Today children get home from school and go straight to â€Å"the box† to watch their favorite program. Watching television is much easier and more exciting than reading. Another reason for the increase in illiteracy is the fact that so many women work. This means that children are often alone at home and so they are unsupervised. When parents get home they are often too tired to spend quality time whit their children. It is also true that many people blame schools for the decline in illiteracy. In many countries there has been a move away from teaching basic skills such as reading and writing. There are many effects of this growing illiteracy rate. The most obvious is unemployment. This may in turn lead to alcohol and drug abuse. Ultimately the economy of the country begins to suffer and there is a drop in living standards. To address this problem, parents need to become more aware of their responsibilities and schools need to consider a change in their teaching methods. If this worsening trend is not reversed, the problem of illiteracy will become very serious.

Street Light

INDEX |S.NO |TITLE |PAGE NO | |1 |Introduction |1 | |2 |Solar Energy |4 | |3 |Photovoltaics |24 | |4 |Solar Cell |28 | |5 |Solar Roadway |51 | |6 |Component description |55 | |7 |Working of Project |82 | |8 |Conclusion |86 | |9 |Images |91 | |10 |Bibliography |93 | INTRODUCTION INTRODUCTION: Solar energy, radiant light and heat from the sun, has been harnessed by humans since ancient times using a range of ever-evolving technologies.Solar energy technologies include solar heating, solar photovoltaics, solar thermal electricity and solar architecture, which can make considerable contributions to solving some of the most urgent energy problems the world now faces. Solar power is the conversion of sunlight into electricity, either directly using photovoltaic (PV), or indirectly using concentrated solar power (CSP). Concentrated solar power systems use lenses or mirrors and tracking systems to focus a large area of sunlight into a small beam. Photovoltaics convert light into electric cur rent using the photoelectric effect. A Street light, lamppost, street lamp, light standard, or lamp standard is a raised source of light on the edge of a road or walkway, which is turned on or lit at a certain time every night.Modern lamps may also have light-sensitive photocells to turn them on at dusk, off at dawn, or activate automatically in dark weather. In older lighting this function would have been performed with the aid of a solar dial. It is not uncommon for street lights to be on posts which have wires strung between them; such as on telephone poles or utility poles. New street lighting technologies, such as LED or induction lights, emit a white light that provides high levels of scotopic lumens allowing street lights with lower wattages and lower photopic lumens to replace existing street lights. Photovoltaic-powered LED luminaires are gaining wider acceptance.Preliminary field tests show that some LED luminaires are energy-efficient and perform well in testing environme nts. This project is a LED based Solar Lights is an automatic street lightening system using a LDR and 6V/5W solar panel. During day time, the internal rechargeable battery receives charging current from the connected solar panel. Here IC 555 is wired as a medium current inverting line driver, switched by an encapsulated light detector (LDR). When ambient light dims, the circuits drive the white LEDs. When the ambient light level restores, circuit returns to its idle state and light(s) switched off by the circuit. Block Diagram: SOLAR ENERGY SOLAR ENERGYSolar energy, radiant light and heat from the sun, has been harnessed by humans since ancient times using a range of ever-evolving technologies. Solar energy technologies include solar heating, solar photovoltaics, solar thermal electricity, solar architecture and artificial photosynthesis, which can make considerable contributions to solving some of the most urgent energy problems the world now faces. Solar technologies are broadly characterized as either passive solar or active solar depending on the way they capture, convert and distribute solar energy. Active solar techniques include the use of photovoltaic panels and solar thermal collectors to harness the energy.Passive solar techniques include orienting a building to the Sun, selecting materials with favorable thermal mass or light dispersing properties, and designing spaces that naturally circulate air. In 2011, the International Energy Agency said that â€Å"the development of affordable, inexhaustible and clean solar energy technologies will have huge longer-term benefits. It will increase countries’ energy security through reliance on an indigenous, inexhaustible and mostly import-independent resource, enhance sustainability, reduce pollution, lower the costs of mitigating climate change, and keep fossil fuel prices lower than otherwise. These advantages are global.Hence the additional costs of the incentives for early deployment should be co nsidered learning investments; they must be wisely spent and need to be widely shared†. The Earth receives 174 petawatts (PW) of incoming solar radiation (insolation) at the upper atmosphere. Approximately 30% is reflected back to space while the rest is absorbed by clouds, oceans and land masses. The spectrum of solar light at the Earth's surface is mostly spread across the visible and near-infrared ranges with a small part in the near-ultraviolet. Earth's land surface, oceans and atmosphere absorb solar radiation, and this raises their temperature. Warm air containing evaporated water from the oceans rises, causing atmospheric circulation or convection.When the air reaches a high altitude, where the temperature is low, water vapor condenses into clouds, which rain onto the Earth's surface, completing the water cycle. The latent heat of water condensation amplifies convection, producing atmospheric phenomena such as wind, cyclones and anti-cyclones. Sunlight absorbed by the o ceans and land masses keeps the surface at an average temperature of 14  °C. By photosynthesis green plants convert solar energy into chemical energy, which produces food, wood and the biomass from which fossil fuels are derived. The total solar energy absorbed by Earth's atmosphere, oceans and land masses is approximately 3,850,000 exajoules (EJ) per year. In 2002, this was more energy in one hour than the world used in one year.Photosynthesis captures approximately 3,000 EJ per year in biomass. The technical potential available from biomass is from 100–300 EJ/year. The amount of solar energy reaching the surface of the planet is so vast that in one year it is about twice as much as will ever be obtained from all of the Earth's non-renewable resources of coal, oil, natural gas, and mined uranium combined. Solar energy can be harnessed at different levels around the world, mostly depending on distance from the equator. [pic] Average insolation showing land area (small black dots) required to replace the world primary energy supply with solar electricity. 18 TW is 568 Exajoule (EJ) per year.Insolation for most people is from 150 to 300 W/m2 or 3. 5 to 7. 0 kWh/m2/day. Solar energy refers primarily to the use of solar radiation for practical ends. However, all renewable energies, other than geothermal and tidal, derive their energy from the sun. Solar technologies are broadly characterized as either passive or active depending on the way they capture, convert and distribute sunlight. Active solar techniques use photovoltaic panels, pumps, and fans to convert sunlight into useful outputs. Passive solar techniques include selecting materials with favorable thermal properties, designing spaces that naturally circulate air, and referencing the position of a building to the Sun.Active solar technologies increase the supply of energy and are considered supply side technologies, while passive solar technologies reduce the need for alternate resources and are g enerally considered demand side technologies. APPLICATIONS OF SOLAR TECHNOLOGY Average  insolation  showing land area (small black dots) required to replace the world primary energy supply with solar electricity. 18 TW is 568 Exajoule (EJ) per year. Insolation for most people is from 150 to 300 W/m2  or 3. 5 to 7. 0 kWh/m2/day. Solar energy refers primarily to the use of  solar radiation  for practical ends. However, all renewable energies, other than  geothermal  and  tidal, derive their energy from the sun. Solar technologies are broadly characterized as either passive or active depending on the way they capture, convert and distribute sunlight.Active solar techniques use photovoltaic panels, pumps, and fans to convert sunlight into useful outputs. Passive solar techniques include selecting materials with favorable thermal properties, designing spaces that naturally circulate air, and referencing the position of a building to the Sun. Active solar technologies incr ease the supply of energy and are considered  supply side technologies, while passive solar technologies reduce the need for alternate resources and are generally considered demand side technologies ARCHITECTURE AND URBAN PLANNING [pic] Darmstadt University of Technology  in Germany  won the 2007  Solar Decathlon  in Washington, D. C. with this  passive house designed specifically for the humid and hot subtropical climate.Sunlight has influenced building design since the beginning of architectural history. Advanced solar architecture and urban planning methods were first employed by the  Greeks  and  Chinese, who oriented their buildings toward the south to provide light and warmth. The common features of  passive solar  architecture are orientation relative to the Sun, compact proportion (a low surface area to volume ratio), selective shading (overhangs) and  thermal mass. When these features are tailored to the local climate and environment they can produce well-lit spaces that stay in a comfortable temperature range. Socrates'  Megaron House is a classic example of passive solar design.The most recent approaches to solar design use computer modeling tying together  solar lighting,  heating  and  ventilation  systems in an integrated  solar design  package. Active solar equipment such as pumps, fans and switchable windows can complement passive design and improve system performance. Urban heat islands (UHI) are metropolitan areas with higher temperatures than that of the surrounding environment. The higher temperatures are a result of increased absorption of the Solar light by urban materials such as asphalt and concrete, which have lower  albedos  and higher  heat capacities  than those in the natural environment. A straightforward method of counteracting the UHI effect is to paint buildings and roads white and plant trees.Using these methods, a hypothetical â€Å"cool communities† program in  Los Ang eles  has projected that urban temperatures could be reduced by approximately 3  Ã‚ °C at an estimated cost of US$1  billion, giving estimated total annual benefits of US$530  million from reduced air-conditioning costs and healthcare savings. [23] AGRICULTURE AND HORTICULTURE [pic] Greenhouses  like these in the Westland municipality of the  Netherlands  grow vegetables, fruits and flowers. Agriculture  and  horticulture  seek to optimize the capture of solar energy in order to optimize the productivity of plants. Techniques such as timed planting cycles, tailored row orientation, staggered heights between rows and the mixing of plant varieties can improve crop yields. [24][25]  While sunlight is generally considered a plentiful resource, the exceptions highlight the importance of solar energy to agriculture.During the short growing seasons of the  Little Ice Age, French and  English  farmers employed fruit walls to maximize the collection of solar energ y. These walls acted as thermal masses and accelerated ripening by keeping plants warm. Early fruit walls were built perpendicular to the ground and facing south, but over time, sloping walls were developed to make better use of sunlight. In 1699,  Nicolas Fatio de Duillier  even suggested using a  tracking mechanism  which could pivot to follow the Sun. [26]  Applications of solar energy in agriculture aside from growing crops include pumping water, drying crops, brooding chicks and drying chicken manure. [27][28]  More recently the technology has been embraced by vinters, who use the energy generated by solar panels to power grape presses. [29]Greenhouses  convert solar light to heat, enabling year-round production and the growth (in enclosed environments) of specialty crops and other plants not naturally suited to the local climate. Primitive greenhouses were first used during Roman times to produce  cucumbers  year-round for the Roman emperor  Tiberius. [30]à ‚  The first modern greenhouses were built in Europe in the 16th century to keep exotic plants brought back from explorations abroad. [31]  Greenhouses remain an important part of horticulture today, and plastic transparent materials have also been used to similar effect in  polytunnels  and  row covers. TRANSPORT AND RECONNAISSANCE [pic] Australia hosts the  World Solar Challengewhere solar cars like the Nuna3 race through a 3,021  km (1,877  mi) course from Darwin to Adelaide.Development of a solar powered car has been an engineering goal since the 1980s. The  World Solar Challenge  is a biannual solar-powered car race, where teams from universities and enterprises compete over 3,021 kilometres (1,877  mi) across central Australia from  Darwin  to  Adelaide. In 1987, when it was founded, the winner's average speed was 67 kilometres per hour (42  mph) and by 2007 the winner's average speed had improved to 90. 87 kilometres per hour (56. 46  mph). [32]à ‚  The  North American Solar Challenge  and the planned  South African Solar Challenge  are comparable competitions that reflect an international interest in the engineering and development of solar powered vehicles. [33][34]Some vehicles use solar panels for auxiliary power, such as for air conditioning, to keep the interior cool, thus reducing fuel consumption. [35][36] In 1975, the first practical solar boat was constructed in England. [37]  By 1995, passenger boats incorporating PV panels began appearing and are now used extensively. [38]  In 1996,  Kenichi Horie  made the first solar powered crossing of the Pacific Ocean, and the  sun21  catamaran made the first solar powered crossing of the Atlantic Ocean in the winter of 2006–2007. [39]  There are plans to circumnavigate the globe in 2010. [40] [pic] Helios UAV  in solar powered flight. In 1974, the unmanned  AstroFlight Sunrise  plane made the first solar flight.On 29 April 1979, the  Sol ar Riser  made the first flight in a solar powered, fully controlled, man carrying flying machine, reaching an altitude of 40 feet (12  m). In 1980, the  Gossamer Penguin  made the first piloted flights powered solely by photovoltaics. This was quickly followed by the  Solar Challenger  which crossed the English Channel in July 1981. In 1990  Eric Scott Raymond  in 21 hops flew from California to North Carolina using solar power. [41]  Developments then turned back to unmanned aerial vehicles (UAV) with the  Pathfinder  (1997) and subsequent designs, culminating in the  Helios  which set the altitude record for a non-rocket-propelled aircraft at 29,524 metres (96,864  ft) in 2001. 42]  The  Zephyr, developed by  BAE Systems, is the latest in a line of record-breaking solar aircraft, making a 54-hour flight in 2007, and month-long flights are envisioned by 2010. [43] A  solar balloon  is a black balloon that is filled with ordinary air. As sunlig ht shines on the balloon, the air inside is heated and expands causing an upward  buoyancy  force, much like an artificially heated  hot air balloon. Some solar balloons are large enough for human flight, but usage is generally limited to the toy market as the surface-area to payload-weight ratio is relatively high. [44] DAYLIGHTING [pic] Daylighting features such as this  oculusat the top of the  Pantheon, in  Rome, Italy have been in use since antiquity.The history of lighting is dominated by the use of natural light. The Romans recognized a  right to light  as early as the  6th century  and English law echoed these judgments with the Prescription Act of 1832. [45][46]  In the 20th century artificial  lighting  became the main source of interior illumination but daylighting techniques and hybrid solar lighting solutions are ways to reduce energy consumption. Daylighting  systems collect and distribute sunlight to provide interior illumination. This pass ive technology directly offsets energy use by replacing artificial lighting, and indirectly offsets non-solar energy use by reducing the need for  air-conditioning. 47]  Although difficult to quantify, the use of  natural lighting  also offers physiological and psychological benefits compared to  artificial lighting. [47]  Daylighting design implies careful selection of window types, sizes and orientation; exterior shading devices may be considered as well. Deciduous trees at the east and west ends of buildings offer shade in the summer and do not block the sun in the winter. [48]  Individual features include sawtooth roofs,  clerestory windows, light shelves,  skylights  and  light tubes. They may be incorporated into existing structures, but are most effective when integrated into a  solar design  package that accounts for factors such as  glare, heat flux and  time-of-use.When daylighting features are properly implemented they can reduce lighting-rel ated energy requirements by 25%. [49] Hybrid solar lighting  (HSL) is an  active solar  method of providing interior illumination. HSL systems collect sunlight using focusing mirrors that  track the Sun  and use  optical fibers  to transmit it inside the building to supplement conventional lighting. In single-story applications these systems are able to transmit 50% of the direct sunlight received. [50] Solar lights that charge during the day and light up at dusk are a common sight along walkways. [51]  Solar-charged lanterns have become popular in developing countries where they provide a safer and cheaper alternative to kerosene lamps. [52]Although  daylight saving time  is promoted as a way to use sunlight to save energy, recent research reports contradictory results: several studies report savings, but just as many suggest no effect or even a net loss, particularly when  gasoline  consumption is taken into account. Electricity use is greatly affected by g eography, climate and economics, making it hard to generalize from single studies. [53] SOLAR THERMAL Solar thermal technologies can be used for water heating, space heating, space cooling and process heat generation. [54] WATER HEATING [pic] Solar water heaters facing the  Sun  to maximize gain. Solar hot water systems use sunlight to heat water.In low geographical latitudes (below 40  degrees) from 60 to 70% of the domestic hot water use with temperatures up to 60  Ã‚ °C can be provided by solar heating systems. [55]  The most common types of solar water heaters are evacuated tube collectors (44%) and glazed flat plate collectors (34%) generally used for domestic hot water; and unglazed plastic collectors (21%) used mainly to heat swimming pools. [56] As of 2007, the total installed capacity of solar hot water systems is approximately 154  GW. [57]  China is the world leader in their deployment with 70  GW installed as of 2006 and a long term goal of 210  GW by 2 020. [58]  Israel  and  Cyprus  are the per capita leaders in the use of solar hot water systems with over 90% of homes using them. 59]  In the United States, Canada and Australia heating swimming pools is the dominant application of solar hot water with an installed capacity of 18  GW as of 2005. [18] HEATING, COOLING AND VENTILATION [pic] Solar House #1 of  Massachusetts Institute of Technology  in the United States, built in 1939, used  Seasonal thermal energy storage (STES)  for year-round heating. In the United States,  heating, ventilation and air conditioning  (HVAC) systems account for 30% (4. 65  EJ) of the energy used in commercial buildings and nearly 50% (10. 1  EJ) of the energy used in residential buildings. [49][60]  Solar heating, cooling and ventilation technologies can be used to offset a portion of this energy.Thermal mass is any material that can be used to store heat—heat from the Sun in the case of solar energy. Common therm al mass materials include stone, cement and water. Historically they have been used in arid climates or warm temperate regions to keep buildings cool by absorbing solar energy during the day and radiating stored heat to the cooler atmosphere at night. However they can be used in cold temperate areas to maintain warmth as well. The size and placement of thermal mass depend on several factors such as climate, daylighting and shading conditions. When properly incorporated, thermal mass maintains space temperatures in a comfortable range and reduces the need for auxiliary heating and cooling equipment. [61]A solar chimney (or thermal chimney, in this context) is a passive solar ventilation system composed of a vertical shaft connecting the interior and exterior of a building. As the chimney warms, the air inside is heated causing an  updraft  that pulls air through the building. Performance can be improved by using glazing and thermal mass materials[62]  in a way that mimics green houses. Deciduous  trees and plants have been promoted as a means of controlling solar heating and cooling. When planted on the southern side of a building, their leaves provide shade during the summer, while the bare limbs allow light to pass during the winter. [63]  Since bare, leafless trees shade 1/3 to 1/2 of incident solar radiation, there is a balance between the benefits of summer shading and the corresponding loss of winter heating. 64]  In climates with significant heating loads, deciduous trees should not be planted on the southern side of a building because they will interfere with winter solar availability. They can, however, be used on the east and west sides to provide a degree of summer shading without appreciably affecting winter solar gain. [65] WATER TREATMENT [pic] Solar water disinfection  in  Indonesia [pic] Small scale solar powered sewerage treatment plant. Solar distillation can be used to make  saline  or  brackish water  potable. The firs t recorded instance of this was by 16th century Arab alchemists. [66]  A large-scale solar distillation project was first constructed in 1872 in the  Chilean  mining town of Las Salinas. 67]  The plant, which had solar collection area of 4,700  m2, could produce up to 22,700  L  per day and operated for 40  years. [67]  Individual  still  designs include single-slope, double-slope (or greenhouse type), vertical, conical, inverted absorber, multi-wick, and multiple effect. [66]  These stills can operate in passive, active, or hybrid modes. Double-slope stills are the most economical for decentralized domestic purposes, while active multiple effect units are more suitable for large-scale applications. [66] Solar water  disinfection  (SODIS) involves exposing water-filled plastic  polyethylene terephthalate  (PET) bottles to sunlight for several hours. 68]  Exposure times vary depending on weather and climate from a minimum of six hours to two days dur ing fully overcast conditions. [69]  It is recommended by theWorld Health Organization  as a viable method for household water treatment and safe storage. [70]  Over two million people in developing countries use this method for their daily drinking water. [69] Solar energy may be used in a water stabilisation pond to treat  waste water  without chemicals or electricity. A further environmental advantage is thatalgae  grow in such ponds and consume  carbon dioxide  in photosynthesis, although algae may produce toxic chemicals that make the water unusable. [71][72] COOKING [pic]The Solar Bowl in  Auroville,  India, concentrates sunlight on a movable receiver to produce  steam  for  cooking. Solar cookers use sunlight for cooking, drying and  pasteurization. They can be grouped into three broad categories: box cookers, panel cookers and reflector cookers. [73]  The simplest solar cooker is the box cooker first built by  Horace de Saussure  in 1767. [7 4]  A basic box cooker consists of an insulated container with a transparent lid. It can be used effectively with partially overcast skies and will typically reach temperatures of 90–150  Ã‚ °C. [75]Panel cookers use a reflective panel to direct sunlight onto an insulated container and reach temperatures comparable to box cookers.Reflector cookers use various concentrating geometries (dish, trough, Fresnel mirrors) to focus light on a cooking container. These cookers reach temperatures of 315  Ã‚ °C and above but require direct light to function properly and must be repositioned to track the Sun. [76] The  solar bowl  is a concentrating technology employed by the Solar Kitchen at  Auroville, in  Tamil Nadu,  India, where a stationary spherical reflector focuses light along a line perpendicular to the sphere's interior surface, and a computer control system moves the receiver to intersect this line. Steam is produced in the receiver at temperatures reaching 150   Ã‚ °C and then used for process heat in the kitchen. [77]A reflector developed by  Wolfgang Scheffler  in 1986 is used in many solar kitchens. Scheffler reflectors are flexible parabolic dishes that combine aspects of trough and power tower concentrators. Polar tracking  is used to follow the Sun's daily course and the curvature of the reflector is adjusted for seasonal variations in the incident angle of sunlight. These reflectors can reach temperatures of 450–650  Ã‚ °C and have a fixed focal point, which simplifies cooking. [78]  The world's largest Scheffler reflector system in Abu Road,  Rajasthan, India is capable of cooking up to 35,000 meals a day. [79]As of 2008, over 2,000 large Scheffler cookers had been built worldwide. [80] PROCESS HEATSolar concentrating technologies such as parabolic dish, trough and Scheffler reflectors can provide process heat for commercial and industrial applications. The first commercial system was the  Solar Total Energy Project  (STEP) in Shenandoah, Georgia, USA where a field of 114 parabolic dishes provided 50% of the process heating, air conditioning and electrical requirements for a clothing factory. This grid-connected cogeneration system provided 400  kW of electricity plus thermal energy in the form of 401  kW steam and 468  kW chilled water, and had a one hour peak load thermal storage. [81] Evaporation ponds are shallow pools that concentrate dissolved solids through  evaporation. The use of evaporation ponds to obtain salt from sea water is one of the oldest applications of solar energy.Modern uses include concentrating brine solutions used in leach mining and removing dissolved solids from waste streams. [82] Clothes lines,  clotheshorses, and clothes racks dry clothes through evaporation by wind and sunlight without consuming electricity or gas. In some states of the United States legislation protects the â€Å"right to dry† clothes. [83] Unglazed transpired collecto rs (UTC) are perforated sun-facing walls used for preheating ventilation air. UTCs can raise the incoming air temperature up to 22  Ã‚ °C and deliver outlet temperatures of 45–60  Ã‚ °C. [84]  The short payback period of transpired collectors (3 to 12  years) makes them a more cost-effective alternative than glazed collection systems. 84]  As of 2003, over 80 systems with a combined collector area of 35,000  m2  had been installed worldwide, including an 860  m2  collector in  Costa Rica  used for drying coffee beans and a 1,300  m2  collector in  Coimbatore, India used for drying marigolds. [28] ELECTRICITY PRODUCTION [pic] The  PS10  concentrates sunlight from a field of heliostats on a central tower. Solar power is the conversion of sunlight into  electricity, either directly using  photovoltaics  (PV), or indirectly using  concentrated solar power  (CSP). CSP systems use lenses or mirrors and tracking systems to focus a large area of sunlight into a small beam. PV converts light into electric current using the  photoelectric effect. Commercial CSP plants were first developed in the 1980s. Since 1985 the eventually 354 MW  SEGS  CSP installation, in the Mojave Desert of California, is the largest solar power plant in the world.Other large CSP plants include the 150 MW  Solnova Solar Power Station  and the 100 MWAndasol solar power station, both in Spain. The 250 MW  Agua Caliente Solar Project, in the United States, and the 214 MW  Charanka Solar Park  inIndia, are the  world’s largest  photovoltaic plants. Solar projects exceeding 1 GW are being developed, but most of the deployed photovoltaics are in small rooftop arrays of less than 5 kW, which are grid connected using net metering and/or a feed-in tariff. [85] Concentrated solar power Concentrating Solar Power (CSP) systems use lenses or mirrors and tracking systems to focus a large area of sunlight into a small beam. The concen trated heat is then used as a heat source for a conventional power plant.A wide range of concentrating technologies exists; the most developed are the parabolic trough, the concentrating linear fresnel reflector, the Stirling dish and the solar power tower. Various techniques are used to track the Sun and focus light. In all of these systems a  working fluid  is heated by the concentrated sunlight, and is then used for power generation or energy storage. [86] PHOTOVOLTAICS PHOTOVOLTAICS A solar cell, or photovoltaic cell (PV), is a device that converts light into electric current using the photoelectric effect. The first solar cell was constructed by Charles Fritts in the 1880s. In 1931 a German engineer, Dr Bruno Lange, developed a photo cell using silver selenite in place of copper oxide.Although the prototype selenium cells converted less than 1% of incident light into electricity, both Ernst Werner von Siemens and James Clerk Maxwell recognized the importance of this discove ry. Following the work of Russell Ohl in the 1940s, researchers Gerald Pearson, Calvin Fuller and Daryl Chapin created the silicon solar cell in 1954. These early solar cells cost 286 USD/watt and reached efficiencies of 4. 5–6%. By 2012 available efficiencies exceed 20% and the maximum efficiency of research photovoltaics is over 40%. OTHERS Besides concentrated solar power and photovoltaics, there are some other techniques used to generated electricity using solar power. These include: †¢Dye-sensitized_solar_cells, Luminescent solar concentrators (a type of concentrated photovoltaics or CPV technology), †¢Biohybrid solar cells, †¢Photon Enhanced Thermionic Emission systems. Development, deployment and economics Beginning with the surge in coal use which accompanied the Industrial Revolution, energy consumption has steadily transitioned from wood and biomass to fossil fuels. The early development of solar technologies starting in the 1860s was driven by an exp ectation that coal would soon become scarce. However development of solar technologies stagnated in the early 20th century in the face of the increasing availability, economy, and utility of coal and petroleum. [109]The 1973 oil embargo and 1979 energy crisis caused a reorganization of energy policies around the world and brought renewed attention to developing solar technologies. Deployment strategies focused on incentive programs such as the Federal Photovoltaic Utilization Program in the US and the Sunshine Program in Japan. Other efforts included the formation of research facilities in the US (SERI, now NREL), Japan (NEDO), and Germany (Fraunhofer Institute for Solar Energy Systems ISE). Commercial solar water heaters began appearing in the United States in the 1890s. These systems saw increasing use until the 1920s but were gradually replaced by cheaper and more reliable heating fuels.As with photovoltaics, solar water heating attracted renewed attention as a result of the oil crises in the 1970s but interest subsided in the 1980s due to falling petroleum prices. Development in the solar water heating sector progressed steadily throughout the 1990s and growth rates have averaged 20% per year since 1999. [57] Although generally underestimated, solar water heating and cooling is by far the most widely deployed solar technology with an estimated capacity of 154 GW as of 2007. The International Energy Agency has said that solar energy can make considerable contributions to solving some of the most urgent problems the world now faces: The development of affordable, inexhaustible and clean solar energy technologies will have huge longer-term benefits.It will increase countries’ energy security through reliance on an indigenous, inexhaustible and mostly import-independent resource, enhance sustainability, reduce pollution, lower the costs of mitigating climate change, and keep fossil fuel prices lower than otherwise. These advantages are global. Hence the additional costs of the incentives for early deployment should be considered learning investments; they must be wisely spent and need to be widely shared. In 2011, the International Energy Agency said that solar energy technologies such as photovoltaic panels, solar water heaters and power stations built with mirrors could provide a third of the world’s energy by 2060 if politicians commit to limiting climate change. The energy from the sun could play a key role in de-carbonizing the global economy alongside improvements in energy efficiency and imposing costs on greenhouse gas emitters. The strength of solar is the incredible variety and flexibility of applications, from small scale to big scale†. We have proved †¦ that after our stores of oil and coal are exhausted the human race can receive unlimited power from the rays of the sun. —Frank Shuman, New York Times, July 2, 1916 SOLAR CELL SOLAR CELL A solar cell made from amonocrystalline silicon wafer Sola r cells can be used devices such as this portable monocrystalline solar charger. A solar cell (also called a photovoltaic cell) is an electrical device that converts the energy of light directly into electricity by the photovoltaic effect. It is a form of photoelectric cell (in that its electrical characteristics—e. g. urrent, voltage, or resistance—vary when light is incident upon it) which, when exposed to light, can generate and support an electric current without being attached to any external voltage source. The term â€Å"photovoltaic† comes from the Greek (phos) meaning â€Å"light†, and from â€Å"Volt†, the unit of electro-motive force, the volt, which in turn comes from the last name of the Italian physicist Alessandro Volta, inventor of the battery (electrochemical cell). The term â€Å"photo-voltaic† has been in use in English since 1849. Photovoltaics is the field of technology and research related to the practical application of photovoltaic cells in producing electricity from light, though it is often used specifically to refer to the generation of electricity from sunlight.Cells can be described as photovoltaic even when the light source is not necessarily sunlight (lamplight, artificial light, etc. ). In such cases the cell is sometimes used as a photodetector (for example infrared detectors), detecting light or other electromagnetic radiationnear the visible range, or measuring light intensity. The operation of a photovoltaic (PV) cell requires 3 basic attributes: 1. The absorption of light, generating either electron-hole pairs or excitons. 2. The separation of charge carriers of opposite types. 3. The separate extraction of those carriers to an external circuit. In contrast, a solar thermal collector collects heat by absorbing sunlight, for the purpose of either direct heating or indirect electrical power generation. Photoelectrolytic cell† (photoelectrochemical cell), on the other hand, refe rs either a type of photovoltaic cell (like that developed by A. E. Becquerel and modern dye-sensitized solar cells) or a device that splits water directly into hydrogen and oxygen using only solar illumination. FURTHER IMPROVEMENTS In the time since Berman's work, improvements have brought production costs down under $1 a watt, with wholesale costs well under $2. â€Å"Balance of system† costs are now more than the panels themselves. Large commercial arrays can be built at below $3. 40 a watt,[12][13]  fully commissioned. As the semiconductor industry moved to ever-larger boules, older equipment became available at fire-sale prices.Cells have grown in size as older equipment became available on the surplus market; ARCO Solar's original panels used cells with 2 to 4  inch (51 to 100  mm) diameter. Panels in the 1990s and early 2000s generally used 5  inch (125  mm) wafers, and since 2008 almost all new panels use 6  inch (150  mm) cells. This material has less e fficiency, but is less expensive to produce in bulk. The widespread introduction of  flat screen televisions  in the late 1990s and early 2000s led to the wide availability of large sheets of high-quality glass, used on the front of the panels. In terms of the cells themselves, there has been only one major change. During the 1990s, polysilicon cells became increasingly popular.These cells offer less efficiency than their monosilicon counterparts, but they are grown in large vats that greatly reduce the cost of production. By the mid-2000s, poly was dominant in the low-cost panel market, but more recently a variety of factors has pushed the higher performance mono back into widespread use. CURRENT EVENTS Other technologies have tried to enter the market. First Solar  was briefly the largest panel manufacturer in 2009, in terms of yearly power produced, using a thin-film cell sandwiched between two layers of glass. Since then silicon panels reasserted their dominant position bo th in terms of lower prices and the rapid rise of Chinese manufacturing, resulting in the top producers being Chinese.By late 2011, efficient production in China, coupled with a drop in European demand due to budgetary turmoil had dropped prices for crystalline solar-based modules further, to about $1. 09[13]  per watt in October 2011, down sharply from the price per watt in 2010. A more modern process, mono-like-multi, aims to offer the performance of mono at the cost of poly, and is in the process of being introduced in 2012[citation needed]. APPLICATIONS [pic] Polycrystalline  photovoltaic cells laminated to backing material in a module [pic] [pic] Polycrystalline photovoltaic cells Solar cells are often electrically connected and encapsulated as a  module. Photovoltaic modules often have a sheet of glass on the front (sun up) side, allowing light to pass while protecting the emiconductor  wafers  from abrasion and impact due to wind-driven debris,  rain,  hail, etc . Solar cells are also usually connected in  series  in modules, creating an additive  voltage. Connecting cells in parallel will yield a higher current; however, very significant problems exist with parallel connections. For example, shadow effects can shut down the weaker (less illuminated) parallel string (a number of series connected cells) causing substantial power loss and even damaging the weaker string because of the excessive  reverse bias  applied to the shadowed cells by their illuminated partners. Strings of series cells are usually handled independently and not connected in parallel, special paralleling circuits are the exceptions.Although modules can be interconnected to create an  array  with the desired peak DC voltage and loading current capacity, using independent MPPTs (maximum power point trackers) provides a better solution. In the absence of paralleling circuits, shunt diodes can be used to reduce the power loss due to shadowing in arrays with ser ies/parallel connected cells. To make practical use of the solar-generated energy, the electricity is most often fed into the electricity grid using inverters (grid-connected  photovoltaic systems); in stand-alone systems, batteries are used to store the energy that is not needed immediately. Solar panels can be used to power or recharge portable devices. THEORYThe solar cell works in three steps: 1. Photons  in  sunlight  hit the solar panel and are absorbed by semiconducting materials, such as silicon. 2. Electrons  (negatively charged) are knocked loose from their atoms, causing an electric potential difference. Current starts flowing through the material to cancel the potential and this electricity is captured. Due to the special composition of solar cells, the electrons are only allowed to move in a single direction. 3. An array of solar cells converts solar energy into a usable amount of  direct current  (DC) electricity. EFFICIENCY Solar panels on the Internatio nal Space Station absorb light from both sides.These Bifacial cells are more efficient and operate at lower temperature than single sided equivalents. The efficiency of a solar cell may be broken down into reflectance efficiency, thermodynamic efficiency, charge carrier separation efficiency and conductive efficiency. The overall efficiency is the product of each of these individual efficiencies. A solar cell usually has a voltage dependent efficiency curve, temperature coefficients, and shadow angles. Due to the difficulty in measuring these parameters directly, other parameters are measured instead: thermodynamic efficiency, quantum efficiency,integrated quantum efficiency, VOC ratio, and fill factor.Reflectance losses are a portion of the quantum efficiency under â€Å"external quantum efficiency†. Recombination losses make up a portion of the quantum efficiency, VOC ratio, and fill factor. Resistive losses are predominantly categorized under fill factor, but also make up minor portions of the quantum efficiency, VOC ratio. The fill factor is defined as the ratio of the actual maximum obtainable power to the product of the open circuit voltage and short circuit current. This is a key parameter in evaluating the performance of solar cells. Typical commercial solar cells have a fill factor ; 0. 70. Grade B cells have a fill factor usually between 0. 4 to 0. 7. 14] Cells with a high fill factor have a low equivalent series resistance and a high equivalent shunt resistance, so less of the current produced by the cell is dissipated in internal losses. Single p–n junction crystalline silicon devices are now approaching the theoretical limiting power efficiency of 33. 7%, noted as the Shockley–Queisser limit in 1961. In the extreme, with an infinite number of layers, the corresponding limit is 86% using concentrated sunlight. [pic] Reported timeline of solar cell energy conversion efficiencies (from National Renewable Energy Laboratory (USA)) MATERIALS [pic] [pic] The  Shockley-Queisser limit  for the theoretical maximum efficiency of a solar cell. Semiconductors with  band gapbetween 1 and 1. eV, or near-infrared light, have the greatest potential to form an efficient cell. (The efficiency â€Å"limit† shown here can be exceeded by  multijunction solar cells. ) Various materials display varying efficiencies and have varying costs. Materials for efficient solar cells must have characteristics matched to the spectrum of available light. Some cells are designed to efficiently convert wavelengths of solar light that reach the Earth surface. However, some solar cells are optimized for light absorption beyond Earth's atmosphere as well. Light absorbing materials can often be used in  multiple physical configurations  to take advantage of different light absorption and charge separation mechanisms.Materials presently used for photovoltaic solar cells include  monocrystalline silicon,  polycrystalline sil icon,  amorphous silicon,  cadmium telluride, andcopper indium selenide/sulfide. [25][26] Many currently available solar cells are made from bulk materials that are cut into  wafers  between 180 to 240  micrometers thick that are then processed like other semiconductors. Other materials are made as  thin-films  layers, organic  dyes, and organic  polymers  that are deposited on  supporting substrates. A third group are made from  nanocrystals  and used as  quantum dots  (electron-confined  nanoparticles). Silicon remains the only material that is well-researched in both  bulkand  thin-film  forms. CRYSTALLINE SILICON [pic]Basic structure of a silicon based solar cell and its working mechanism. By far, the most prevalent bulk material for solar cells is crystalline silicon (abbreviated as a group as c-Si), also known as â€Å"solar grade silicon†. Bulk silicon is separated into multiple categories according to crystallinity and crystal siz e in the resulting ingot, ribbon, orwafer. 1. monocrystalline silicon (c-Si): often made using the Czochralski process. Single-crystal wafer cells tend to be expensive, and because they are cut from cylindrical ingots, do not completely cover a square solar cell module without a substantial waste of refined silicon. Hence most c-Si panels have uncovered gaps at the four corners of the cells. 2. olycrystalline silicon, or multicrystalline silicon, (poly-Si or mc-Si): made from cast square ingots — large blocks of molten silicon carefully cooled and solidified. Poly-Si cells are less expensive to produce than single crystal silicon cells, but are less efficient. United States Department of Energy data show that there were a higher number of polycrystalline sales than monocrystalline silicon sales. 3. ribbon silicon is a type of polycrystalline silicon: it is formed by drawing flat thin films from molten silicon and results in a polycrystalline structure. These cells have lower efficiencies than poly-Si, but save on production costs due to a great reduction in silicon waste, as this approach does not require sawing from ingots. 4. ono-like-multi silicon: Developed in the 2000s and introduced commercially around 2009, mono-like-multi, or cast-mono, uses existing polycrystalline casting chambers with small â€Å"seeds† of mono material. The result is a bulk mono-like material with poly around the outsides. When sawn apart for processing, the inner sections are high-efficiency mono-like cells (but square instead of â€Å"clipped†), while the outer edges are sold off as conventional poly. The result is line that produces mono-like cells at poly-like prices. Analysts have predicted that prices of polycrystalline silicon will drop as companies build additional polysilicon capacity quicker than the industry's projected demand. On the other hand, the cost of producing upgraded metallurgical-grade silicon, also known as UMG Si, can potentially be one- sixth that of makingpolysilicon.Manufacturers of wafer-based cells have responded to high silicon prices in 2004–2008 prices with rapid reductions in silicon consumption. According to Jef Poortmans, director of IMEC's organic and solar department, current cells use between eight and nine grams of silicon per watt of power generation, with wafer thicknesses in the neighborhood of 0. 200 mm. At 2008 spring's IEEEPhotovoltaic Specialists' Conference (PVS'08), John Wohlgemuth, staff scientist at BP Solar, reported that his company has qualified modules based on 0. 180 mm thick wafers and is testing processes for 0. 16 mm wafers cut with 0. 1 mm wire. IMEC's road map, presented at the organization's recent annual research review meeting, envisions use of 0. 08 mm wafers by 2015. Gallium arsenide multijunction:High-efficiency multijunction cells were originally developed for special applications such as satellites and space exploration, but at present, their use in terrestrial conc entrators might be the lowest cost alternative in terms of $/kWh and $/W. [35] These multijunction cells consist of multiple thin films produced using metalorganic vapour phase epitaxy. A triple-junction cell, for example, may consist of the semiconductors: GaAs, Ge, and GaInP2. [36] Each type of semiconductor will have a characteristic band gap energy which, loosely speaking, causes it to absorb light most efficiently at a certain color, or more precisely, to absorb electromagnetic radiation over a portion of the spectrum.Combinations of semiconductors are carefully chosen to absorb nearly the entire solar spectrum, thus generating electricity from as much of the solar energy as possible. GaAs based multijunction devices are the most efficient solar cells to date. In October 15, 2012, triple junction metamorphic cell reached a record high of 44%. [37] Tandem solar cells based on monolithic, series connected, gallium indium phosphide (GaInP), gallium arsenide GaAs, and germanium Ge p–n junctions, are seeing demand rapidly rise. Between December 2006 and December 2007, the cost of 4N gallium metal rose from about $350 per kg to $680 per kg. Additionally, germanium metal prices have risen substantially to $1000–1200 per kg this year.Those materials include gallium (4N, 6N and 7N Ga), arsenic (4N, 6N and 7N) and germanium, pyrolitic boron nitride (pBN) crucibles for growing crystals, and boron oxide, these products are critical to the entire substrate manufacturing industry. Triple-junction GaAs solar cells were also being used as the power source of the Dutch four-time World Solar Challenge winners Nuna in 2003, 2005 and 2007, and also by the Dutch solar carsSolutra (2005), Twente One (2007) and 21Revolution (2009). The Dutch Radboud University Nijmegen set the record for thin film solar cell efficiency using a single junction GaAs to 25. 8% in August 2008 using only 4  µm thick GaAs layer which can be transferred from a wafer base to glass or pl astic film. THIN FILMS [pic]Market share of the different PV technologies  In 2010 the market share of thin film declined by 30% as thin film technology was displaced by more efficient crystalline silicon solar panels (the light and dark blue bars). Thin-film technologies reduce the amount of material required in creating the active material of solar cell. Most thin film solar cells are sandwiched between two panes of glass to make a module. Since silicon solar panels only use one pane of glass, thin film panels are approximately twice as heavy as crystalline silicon panels. The majority of film panels have significantly lower conversion efficiencies, lagging silicon by two to three percentage points. 31]  Thin-film solar technologies have enjoyed large investment due to the success of First Solar and the largely unfulfilled promise of lower cost and flexibility compared to wafer silicon cells, but they have not become mainstream solar products due to their lower efficiency and corresponding larger area consumption per watt production. Cadmium telluride  (CdTe),  copper indium gallium selenide  (CIGS) and  amorphous silicon  (A-Si) are three thin-film technologies often used as outdoor photovoltaic solar power production. CdTe technology is most cost competitive among them. [32]  CdTe technology costs about 30% less than CIGS technology and 40% less than A-Si technology in 2011. CADMIUM TELLURIDE SOLAR CELLA cadmium telluride solar cell uses a cadmium telluride (CdTe) thin film, a  semiconductor  layer to absorb and convert sunlight into electricity. Solarbuzzhas reported that the lowest quoted thin-film module price stands at US$0. 84 per  watt-peak, with the lowest crystalline silicon (c-Si) module at $1. 06 per watt-peak. [33] The  cadmium  present in the cells would be toxic if released. However, release is impossible during normal operation of the cells and is unlikely during ? res in residential roofs. [34]  A square meter of CdTe contains approximately the same amount of Cd as a single C cell  Nickel-cadmium battery, in a more stable and less soluble form. [34]COPPER INDIUM GALLIUM SELENIDE Copper indium gallium selenide (CIGS) is a  direct band gap  material. It has the highest efficiency (~20%) among thin film materials (see  CIGS solar cell). Traditional methods of fabrication involve vacuum processes including co-evaporation and sputtering. Recent developments at  IBM  and  Nanosolar  attempt to lower the cost by using non-vacuum solution processes. GALLIUM ARSENIDE MULTIJUNCTION High-efficiency multijunction cells were originally developed for special applications such as  satellites  and  space exploration, but at present, their use in terrestrial concentrators might be the lowest cost alternative in terms of $/kWh and $/W. 35]  These multijunction cells consist of multiple thin films produced using  metalorganic vapour phase epitaxy. A triple-junction cell, for example, may consist of the semiconductors:  GaAs,  Ge, and  GaInP2. [36]  Each type of semiconductor will have a characteristic  band gap  energy which, loosely speaking, causes it to absorb light most efficiently at a certain color, or more precisely, to absorb  electromagnetic radiation  over a portion of the spectrum. Combinations of semiconductors are carefully chosen to absorb nearly all of the solar spectrum, thus generating electricity from as much of the solar energy as possible. GaAs based multijunction devices are the most efficient solar cells to date.In October 15, 2012, triple junction metamorphic cell reached a record high of 44%. [37] Tandem solar cells based on monolithic, series connected, gallium indium phosphide (GaInP), gallium arsenide GaAs, and germanium Ge p–n junctions, are seeing demand rapidly rise. Between December 2006 and December 2007, the cost of 4N gallium metal rose from about $350 per kg to $680 per kg. Additionally, germanium metal p rices have risen substantially to $1000–1200 per kg this year. Those materials include gallium (4N, 6N and 7N Ga), arsenic (4N, 6N and 7N) and germanium, pyrolitic boron nitride (pBN) crucibles for growing crystals, and boron oxide, these products are critical to the entire substrate manufacturing industry.Triple-junction GaAs solar cells were also being used as the power source of the Dutch four-time  World Solar Challenge  winners  Nuna  in 2003, 2005 and 2007, and also by the Dutch solar carsSolutra (2005),  Twente One (2007)  and 21Revolution (2009). The Dutch  Radboud University Nijmegen  set the record for thin film solar cell efficiency using a single junction GaAs to 25. 8% in August 2008 using only 4  Ã‚ µm thick GaAs layer which can be transferred from a wafer base to glass or plastic film. Light-absorbing dyes (DSSC) Dye-sensitized solar cells  (DSSCs) are made of low-cost materials and do not need elaborate equipment to manufacture, so they can be made in a  DIY  fashion, possibly allowing players to produce more of this type of solar cell than others. In bulk it should be significantly less expensive than older  solid-state  cell designs.DSSC's can be engineered into flexible sheets, and although its  conversion efficiency  is less than the best  thin film cells, its  price/performance ratio  should be high enough to allow them to compete with  fossil fuel electrical generation. Typically a  ruthenium  metalorganic  dye  (Ru-centered) is used as a  monolayer  of light-absorbing material. The dye-sensitized solar cell depends on a  mesoporous  layer of  nanoparticulate  titanium dioxide  to greatly amplify the surface area (200–300 m2/g TiO2, as compared to approximately 10 m2/g of flat single crystal). The photogenerated electrons from the  light absorbing dye  are passed on to the  n-type  TiO2, and the holes are absorbed by an  electrolyte  on the other side of the dye.The circuit is completed by a redox couple in the electrolyte, which can be liquid or solid. This type of cell allows a more flexible use of materials, and is typically manufactured by  screen printing  or use of  Ultrasonic Nozzles, with the potential for lower processing costs than those used for  bulk  solar cells. However, the dyes in these cells also suffer from  degradation  under heat and  UV  light, and the cell casing is difficult to  seal  due to the solvents used in assembly. In spite of the above, this is a popular emerging technology with some commercial impact forecast within this decade. The first commercial shipment of DSSC solar modules occurred in July 2009 from G24i Innovations. [38] Quantum Dot Solar Cells (QDSCs)Quantum dot solar cells  (QDSCs) are based on the Gratzel cell, or  dye-sensitized solar cell, architecture but employ low  band gap  semiconductor  nanoparticles, fabricated with such small crystallite sizes th at they form  quantum dots  (such as  CdS,  CdSe,  Sb2S3,  PbS, etc. ), instead of organic or organometallic dyes as light absorbers. Quantum dots (QDs) have attracted much interest because of their unique properties. Their size quantization allows for the  band gap  to be tuned by simply changing particle size. They also have high  extinction coefficients, and have shown the possibility of  multiple exciton generation. [39] In a QDSC, a  mesoporous  layer of  titanium dioxide  nanoparticles forms the backbone of the cell, much like in a DSSC.This TiO2  layer can then be made photoactive by coating with semiconductor quantum dots using  chemical bath deposition,  electrophoretic deposition, or successive ionic layer adsorption and reaction. The electrical circuit is then completed through the use of a liquid or solid  redox couple. During the last 3–4 years, the efficiency of QDSCs has increased rapidly[40]  with efficiencies over 5% show n for both liquid-junction[41]  and solid state cells. [42]  In an effort to decrease production costs of these devices, the  Prashant Kamat  research group[43]  recently demonstrated a solar paint made with TiO2  and CdSe that can be applied using a one-step method to any conductive surface and have shown efficiencies over 1%. [44] Organic/polymer solar cellsOrganic solar cells  are a relatively novel technology, yet hold the promise of a substantial price reduction (over thin-film silicon) and a faster return on investment. These cells can be processed from solution, hence the possibility of a simple roll-to-roll printing process, leading to inexpensive, large scale production. Organic solar cells and  polymer solar cells  are built from thin films (typically 100  nm) of  organic semiconductors  including polymers, such as  polyphenylene vinylene  and small-molecule compounds like copper phthalocyanine (a blue or green organic pigment) and  carbon ful lerenes  and fullerene derivatives such as  PCBM. Energy conversion efficiencies achieved to date using conductive polymers are low compared to inorganic materials.However, it has improved quickly in the last few years and the highest  NREL  (National Renewable Energy Laboratory) certified efficiency has reached 8. 3% for the  Konarka  Power Plastic. [45]  In addition, these cells could be beneficial for some applications where mechanical flexibility and disposability are important. These devices differ from inorganic semiconductor solar cells in that they do not rely on the large built-in electric field of a PN junction to separate the electrons and holes created when photons are absorbed. The active region of an organic device consists of two materials, one which acts as an electron donor and the other as an acceptor.When a photon is converted into an electron hole pair, typically in the donor material, the charges tend to remain bound in the form of an  exciton, a nd are separated when the exciton diffuses to the donor-acceptor interface. The short exciton diffusion lengths of most polymer systems tend to limit the efficiency of such devices. Nanostructured interfaces, sometimes in the form of bulk heterojunctions, can improve performance. [46] In 2011, researchers at the Massachusetts Institute of Technology and Michigan State University developed the first highly efficient transparent solar cells that had a power efficiency close to 2% with a transparency to the human eye greater than 65%, achieved by selectively absorbing the ultraviolet and near-infrared parts of the spectrum with small-molecule compounds. 47]  [48]Researchers at UCLA more recently developed an analogous polymer solar cell, following the same approach, that is 70% transparent and has a 4% power conversion efficiency. [49]  The efficiency limits of both opaque and transparent organic solar cells were recently outlined. [50]  [51]  These lightweight, flexible cells can be produced in bulk at a low cost, and could be used to create power generating windows. Silicon thin films Silicon thin-film cells  are mainly deposited by  chemical vapor deposition  (typically plasma-enhanced, PE-CVD) from  silane  gas and  hydrogen  gas. Depending on the deposition parameters, this can yield:[52] 1. Amorphous silicon  (a-Si or a-Si:H) 2. Protocrystalline  silicon or 3. Nanocrystalline silicon  (nc-Si or nc-Si:H), also called microcrystalline silicon.It has been found that protocrystalline silicon with a low volume fraction of nanocrystalline silicon is optimal for high open circuit voltage. [53]  These types of silicon present dangling and twisted bonds, which results in deep defects (energy levels in the bandgap) as well as deformation of the valence and conduction bands (band tails). The solar cells made from these materials tend to have lower  energy conversion efficiency  than  bulk  silicon, but are also less expensive to p roduce. The  quantum efficiency  of thin film solar cells is also lower due to reduced number of collected charge carriers per incident photon. An amorphous silicon (a-Si) solar cell is made of amorphous or microcrystalline silicon and its basic electronic structure is the  p-i-n  junction. -Si is attractive as a solar cell material because it is abundant and non-toxic (unlike its CdTe counterpart) and requires a low processing temperature, enabling production of devices to occur on flexible and low-cost substrates. As the amorphous structure has a higher absorption rate of light than crystalline cells, the complete light spectrum can be absorbed with a very thin layer of photo-electrically active material. A film only 1 micron thick can absorb 90% of the usable solar energy. [54]  This reduced material requirement along with current technologies being capable of large-area deposition of a-Si, the scalability of this type of cell is high.However, because it is amorphous, i t has high inherent disorder and dangling bonds, making it a bad conductor for charge carriers. These dangling bonds act as recombination centers that severely reduce the carrier lifetime and pin the Fermi energy level so that doping the material to n- or p- type is not possible. Amorphous Silicon also suffers from the Staebler-Wronski effect, which results in the efficiency of devices utilizing amorphous silicon dropping as the cell is exposed to light. The production of a-Si thin film solar cells uses glass as a substrate and deposits a very thin layer of silicon by  plasma-enhanced chemical vapor deposition  (PECVD).A-Si manufacturers are working towards lower costs per watt and higher conversion efficiency with continuous research and development on  Multijunction solar cells  for solar panels. Anwell Technologies Limited  recently announced its target for mul

Burj Khalifa Assignment Example | Topics and Well Written Essays - 750 words

Burj Khalifa - Assignment Example From the outset, we decided a leader and set about delegating tasks and dividing labor to be more productive (Murphy, pg.12). Someone was assigned to draw the schematic that we were to follow. Another pair was assigned to make the measurements and do the adequate research to ensure accurate replication. Moreover, assignments were made to ensure that there were a few people that were dedicated solely to the actual building of the tower, while someone was delegated the task of painting the tower, and finally, the most diligent of us all was selected to make final measurements and check to see whether everything has been up to par. Delegation of tasks really helped us save time, while allow each individual to focus on one task, making the whole project efficiently done throughout (Lussier & Achua, pg. 194). We started by drawing out a schematic picture of the tower, as we wanted to build it. This stage involved a lot of work as every line and angle had to be accurately drawn, as it woul d be the blue print we would be working against. Pictures of the tower were downloaded, and much research was done to get the images of the inside of the tower, with its floors, ceilings, and curvatures. Those of our team that were the best with a pencil got to work, and drew a good, detailed and revealing picture of the tower, with exact dimensions and angles. ... We used rulers, setsquares, and many protractors while building the erect tower. The base of the hotel was built using plaster of Paris hard clay that was left to dry overnight to give the model a hard, sturdy texture. The plaster was shaped into the curved "sail" that the hotel is often compared to by building it upright by adding layer upon layer of the plaster and making minute changes as it grew taller and took on its final shape. The final, top most portion of the tower, which was pointy was the hardest bit, and was made using a blade and a softer plaster to allow for finesse that is more delicate. Finally, after leaving the figure to dry, the rough edges of the top layer of the tower were scraped off with a blade, leaving a smooth, tall tower behind, that appeared majestic, even without being coloured into. Once the base of the tower and the building itself had been made, the painter got to work by painting the tower, adding details such as windows and lights that gave the towe r a realistic look. To ensure the colors were close to the actual building, we used color charts and different shades of paint. Finally, last measurements were made using the finest of rulers and vernier calipers to check whether the plan was adequately followed, and that the tower was really a miniature version of the hotel we had set out to replicate. Even though this was a very hard project, we were pleased with what we had achieved, although it was not without challenges. For example, during our planning stages we had not allowed enough time for the Plaster to dry up and harden, and so, once we continued to mold it after letting it stand for a few hours, we felt it give.

Business Etiquette and Elevator Pitch Activities Essay

Business Etiquette and Elevator Pitch Activities - Essay Example However, if the elevator pitch is a failure, the conversation will die just as the elevator ride stops. Successful business people are always prepared with their elevator pitch speech because they know that one missed shot will cost them quite a lot. (Mike Gunderloy, 2004). In the chosen airline industry, the concept of elevator pitch is very important. All employees of an airline serves as the company’s ambassadors because whatever they will communicate through their actions and words would actually help people create a positive or negative image of the airline in their minds (Chris Westfall, 2012). If a flight attendant does not treat a customer in a friendly and polite manner, it is likely that he will never travel with the same airline ever in his life and might also used the ‘word of mouth’ to discourage others. A flight attendant must always be prepared for an elevator pitch speech because every day or so he is interacting with people who are really interested in knowing about their experience, skills and association with the airline company. If a flight attendant is unable to communicate the elevator pitch speech to the other person, it is likely that his skills will be doubted because a flight attendant is assumed to be very confident, quick and rational. The elevator pitch speech of a flight attendant has to be very interesting, catchy and memorable. He first needs to identify his goal so that he knows where he is directing all his efforts. A very important step in the creation of an effective pitch is that you need to be aware of what you do, what kind of soft skills you possess and what you have learned from all the years you have served in the airline as a flight attendant. Once this step is accomplished, you need to select exactly what part of the identified information could be shared. This will help you define yourself in a

Tourism Essay Example | Topics and Well Written Essays - 2500 words - 2

Tourism - Essay Example After this point the paper will give some insight as to the overall trends in the international community specifically in the United States. Next an in depth analysis will be conducted as to how the UK travel industry has been affected by the recession and provide insight as to what strategies some organizations have opted to utilize in effort to combat the recession specifically focusing on strategies such as offering new low cost options or increased advertising. Building on these points this paper will argue that many of these changes may simply be short term strategies designed to adjust to temporary changes in consumer preferences and how some strategies are designed to be coherent long term strategies. In an article published by the Suffolk City Council (2008) a number of different groups were identified as being the most likely to be affected by the current recession. Primarily identified were in terms of individuals were people with low incomes such as those people with fixed incomes, and those people unable to cope with rising costs such as those heavily in debt. In regards to manufacturers and service providers the research summary identified that companies manufacturing durable consumer goods such as washing machines or cars will be severely negatively affected by the recession owing to the fact that consumers are reluctant to make big purchases in times of economic uncertainty. More importantly to this topic the Suffolk City Council (2008) identifies that the service sector will be the most negatively affected sector insofar as retail, financial services leisure has already seen some of its biggest decrease in output levels since the mid nineties. The reasoning behind this d ecrease in the service sector (Specifically the leisure sector) is because of the falling consumer confidence in the overall economy. According to Barbaro and Uchitelle (2008) it is the case that in the American context consumer confidence in the strength of

Proposal Argument Assignment Example | Topics and Well Written Essays - 1750 words

Proposal Argument - Assignment Example Data in support of more bicycle lanes V. The Safety Aspect of Bicycling a. How street bike lanes make city biking safer for all concerned b. The â€Å"Safety Numbers† effect VI. Conclusion More Bicycle Lanes Will Make Street Biking Safer and Reduce Street Biking Accidents Bicycles have been a standard mode of transportation for people far longer than the cars have been in existence. These bone shakers were the preferred method of the early Americans when it came to getting around their neighborhood on errands and trips to visit friends. It has always been considered one of the most cost - effective, if not the most cost effective ways of transportation because of the method by which the mode of transport works, it does not require the use of gasoline. Health experts have argued and defended the positive effects of bicycling on the health of people. Environmentalists have pointed out the advantages of bicycling in terms of nature preservation and reduction of gas emissions into the atmosphere. Yet with all of these expert opinions abounding, it seems that the local governments have chosen to turn a deaf ear to the fact that our city would greatly benefit from the expansion of the current number of bicycle lanes in the city to a number that would actually have a positive impact on the traffic situation in the city, and address the growing concern for the safety of the increasing number of cyclists in our city streets. We have grown up in a â€Å"car culture† society. This means that we looks towards our automotive vehicles as our primary and only mode of transport. our culture saw bike riders as a danger to the â€Å"open door† situation of cars that were parked along the curb of sidewalks where bicycles were relegated to in the absence of actual bicycle lanes. There was a real fear that the cyclists would damage the car doors by slamming into them and causing a serious roadside accident. But, according to the Boston Cyclists Union (â€Å"Bi ke Lanes, The Reasoning Behind Them and a Bit of Boston History†) ; A typical argument from this anti-bike-lane crew is that bike lanes put riders closer to or inside the door zone. The city of Cambridge’s 2005 Hampshire Street Study has been called the â€Å"nail in the coffin† of that argument. Instead of moving into the door zone after a new bike lane was installed, people moved further away from it... The average distance away from the cars increased by only 2.4 inches. But the distribution of distances narrowed, so far fewer riders rode really close to the doors and about 8 percent of riders moved completely out of the door zone. Typical biking accidents include off-road riding, trick riding or racing. Due to the fact that there are only limited bike lanes available in the city, cyclists have to battle for street space with the cars. Due to the nature of the vehicle, not much protection is offered to the cyclist in the event of an accident. Gathered informat ion about biking accidents from 2008-2009 show that in the city of Toronto, There were 2, 335 injured cyclists admitted to their emergency rooms (Badger, Emily â€Å"Dedicated Bike Lanes Can Cut Cycling Injuries in Half†). The results of the study in Canada which were published in the American Journal of Public Health further explained that these injuries were sustained on 14 different types of streets lanes. These street paths included (Schmitt, Angie â€Å"Study: Protected Bike Lanes Reduce Injury Risk Up to 90 Percent†

Financial modelling Lab Report Example | Topics and Well Written Essays - 1500 words

Financial modelling - Lab Report Example For a given value of expected return, MPT tends to explain how one can select a portfolio with the least possible risk. Standard deviation is the most commonly and widely used measure of spread and thus it measures the potential variability, volatility and risk. Standard deviation (ÏÆ'i ) can be used as a good measure of relative risk between two investments that have the same expected rate of return. It can be calculated for each and every individual shares, portfolios of shares and for the market as a whole. A larger value of ÏÆ'i implies a lower probability that actual returns will be closer to the expected returns. We first calculated standard deviation, covariance matrix and expected return. The standard deviation and expected return were calculated by applying the Excel STDEV and AVERAGE functions to the historic monthly percentage returns data. Table 1 below shows the correlation matrix, standard deviations, and the average returns for the rates of return on the stock index. After we input Table 1 into our spreadsheet as shown, we created the covariance matrix in Table 2 using the relationship . The curved line represents the return values and risks that result from combination of various shares. It is also known as the efficient frontier and it represents efficient portfolios of shares that is, portfolios that give the minimum risk for a given level of return or maximum return for a given level of risk. On the other hand, the straight line is known as capital allocation line and it represents the expected return and standard deviation from various combinations of the risk-free asset and the optimal risky portfolio. It starts at the risk-free return of 4% and is perpendicular to the curved line. It represents the highest ratio of risk premium to standard deviation (Sharpe Ratio). For our computations if we invest in a free risk with 10% portfolio we get

Aspects of the Fundamentals of Speech Class in APA Style Essay

Aspects of the Fundamentals of Speech Class in APA Style - Essay Example The exchange of thoughts, messages, or information by speech is very crucial in our daily lives.The American Heritage Dictionary of the English Language states that communication is â€Å"The art and technique of using words effectively to impart information or ideas†. Speech is used in our everyday lives, whether or not we realize it. It is not something that we learn in school and will never implement in real life. One who can communicate more effectively will more likely gain better success in all areas-personal, academic, and professional of life. Speech, or public speaking, involves organizing ideas, researching these ideas, and presenting them to others. We all have many, many ideas about what we would like to speak about. The difficult part is narrowing it all down to one idea, or topic. The best way to do this is to choose a topic that you are familiar with and interested in. Use resources such as magazine articles, books, newspapers, television shows, conversations with people, etc. to help gain ideas. Knowing how to choose the best topic, narrowing it down, and researching (learning more about various subjects) are skills that can improve my daily communication such as talking with a friend, discussing a topic with a professor, or trying to land a job with an employer. employer. Fundamentals of Speech 3 Determine what the purpose of your speech. Will you be speaking to inform and to offer information or will you be writing to try and persuade Informing is to give facts and information without adding personal opinion. Persuading is to try and change the attitudes and thoughts of your listeners in order to get them to act upon what you have said in your speech. The skill of delivering information in a manner that is interesting yet informative and the power of persuasions helps my listeners to believe what I say. Speech helps me to be a better storyteller and makes me more social in my personal life. As I can communicate better verbally, I am more secure about myself and others want to listen. Professionally and academically this knowledge of delivering information and to be able to persuade others using speech is an extremely effective tool that will lead to my success whether I am in class, at an entry level position, or an executive position in the workplace. The best speeches contain your own experience and knowledge of the chosen topic. Use information from materials such as books, magazines, reference materials, etc. from various sources. Libraries contain a wealth of information. Interviews, the internet and visiting various locations can provide the necessary information. Be sure to take good notes and to give credit to the author of the information that you will be using. Researching and listing references (or where you got the material) will add credibility to your speech especially if you are doing a persuasive speech. Learning more about various subjects helps me to be able to relate to almost anyone. I can appreciate what they are talking about since I am familiar with their conversation. Researching is a skill that is required in speech, which helps me be more open-minded and knowledgeable. As I am Fundamentals of Speech 4 can relate to others better, they will open up and can relate to me more for they know that I am interested in what they are saying. Academically and professionally, I will also do well since I will know my roles/job better. If I have a problem, I can research it and if I still cannot find the answers, I am able to communicate my issues more effectively. If there is a conflict, I can work my way through it by delivering my point of view better without stuttering, showing anger, confusion, etc. This will build up my self esteem and I will feel more secure and it will

Critically discuss the the extend to which attitudes towards the Essay

Critically discuss the the extend to which attitudes towards the mentally ill improved during the nineteenth century - Essay Example This responsibility slowly occurred during the early and mid-1800s. This new treatment of psychologically unstable patients marked the beginning of a new recognition that irregular psychological states and behaviour patterns were the outcomes of possibly treatable illnesses. The following paper critically discusses the degree to which attitudes towards the mentally ill improved in the nineteenth century UK. To understand this degree, the paper will begin by briefly discussing the attitude of the UK health industry and society towards the mentally ill several decades before 1800. The 1800s saw the slow emergence of a humane attitude towards the mentally unstable, but geographic and institutional separation would persist in the treatment of mental disorders. Before the nineteenth century, the United Kingdom health department, together with society, did not take psychological illnesses seriously. Before the deployment of ‘mad doctors,’ there were no medical facilities for the mentally ill. As a result, doctors often isolated a psychologically unstable patient from the rest by ensuring the patient was homebound.1 Another indication of the unserious treatment of mentally unstable patients was their relatives’ denial of the illness. Physicians who recommended mentally ill patients to remain at home often fuelled this denial by family members. In spite of a more compassionate attitude called ‘moral treatment’ having arisen between 1790 and 1800, the entire UK health department was far from treating the mentally ill morally.2 The construction of asylums did not assist in improving this attitude either. Instead, asylums simply showed society that the government had recognised mental problems as treatable issues , but not through conventional methods. The main purpose of moral treatment was to diminish external, bodily coercion, which was not evident until the onset of the

Killology Essay Example for Free

Killology Essay Do violence in the media and interactive entertainment, such as video games and movies, influence children to have the will to kill? According to Lt. Col. Dave Grossman, an expert on the psychology of killing, both play a big role in child murders. There are several methods to this madness by which people can actually motivate themselves to take another human life, such as, operant conditioning, classical conditioning, brutalization, and role models. These practices are used in the military to train soldiers to kill, just as the media is doing to our children. Monday, December 1st, 1997 began like any other day for the students of Heath High School in Paducah, Kentucky. Student Michael Carneal rode to school with his sister, carrying with him, what he claimed to be, an art project. As his fellow classmates gathered that morning in the lobby of the school, holding a prayer group, he fired eight rounds from a . 22 caliber pistol. Out of those eight rounds he landed five head shots and three upper torso shots, killing three teenagers. Not only did he land all eight shots, but the shots were so precise that elite military and law enforcement agencies were stunned by his expertise. The fact that he had never fired a real gun in his life was something that disturbed authorities even more. Nowhere in the records of military or law enforcement history could the â€Å"equivalent† achievement be found. So what was it that made this young man so violent and deadly at such a young age? (The shooting, 2010, para. 1) It’s one of the methods used by the military to train their soldiers called operant conditioning, a powerful procedure of stimulus-response training techniques that attempt to influence behavior by manipulating reinforcers. They learn to fire at realistic figures that pop up in the field. The stimulus is the target, and the response is, shooting to kill. This procedure is repeated over and over, hundreds of times, until their natural response when someone pops up on the battlefield is to kill. Research has suggested that violent video games played a big role in the choice Michael made that day. He was trained through operant conditioning just as the soldiers are, except his was through violent video games. Following the shooting there was a $130-million law suit filed against the video game manufacturers in that case. This case is said to be working its way through the appeals system of the courts. (Metcalf, Stubblefield, Ettinger, 2011, p. 152) Violent video games train our children to kill, glorify violence, desensitize them to suffering, and trivialize violence. Every time a child plays an interactive video game, he or she is learning the exact same conditioned reflex skills as a soldier or police officer in training. Kids are playing more and more violent video games that are rated for a mature audience. So, ask yourself this question; how do fourteen year old teenagers obtain video games that are rated â€Å"Mature? † Better yet, why are they allowed by their parents to play the evil, sadistic games? Parents should replace the violent video games with non-violent, stimulating, and educational games; those which enhance knowledge, creativity and imagination. The violent crime rate is at a phenomenally high level, not just in America, but worldwide. According to Interpol, the per capita assault rate increased nearly fivefold in Norway and Greece between the years of 1977 and 1993. In Mexico and Brazil, the numbers are skyrocketing, and in Japan juvenile crime went up by thirty percent in 1997 alone. (Metcalf, Stubblefield, Ettinger, 2011, p. 150). The virus of violent crime is occurring worldwide, and the explanation for it has to be some new factor that is occurring in all of these countries. There are many factors involved in the action of violent crime, and we must never downplay any of them. There is only one new variable present in each of these nations, and it is that media violence is now being presented as a viable entertainment option for children. Metcalf et al. , 2011, p. 150) Another method used by the Japanese, in World War II, which we also see done with the media, is classical conditioning. This technique is best remembered as Pavlovian conditioning, associating a stimulus with a response according to a specific reinforcement schedule, such as violence linked to pleasure. As Pavlov did with the dog, by associating the bell with food and eventually the dog could not hear the bell without salivating, the media does with the children. How often do we watch the news and learn of something good that has happened in the world? They are always focusing on all of the violence that is going on in the world. Our children see this as well, and they learn to associate death with pleasure. To better understand the role that violence and the media inherit, in the entertainment complex, plays in the increase of murders among the young and impressionable. We must first look at the methods by which killers can be made. Though such a difficult subject cannot be completely explained by these factors alone, it is important to note the contribution each one makes. Throughout the course of human history, it is thought that healthy members of most species have a natural resistance to killing their own kind. However, when human beings are overwhelmed with anger and fear, thought processes become primitive. We slam head-on into that hardwired resistance against killing. One of the methods that shift this natural resistance is what is commonly known as brutalization. Quite similar to a military boot camp, brutalization is a forced shift in values. The subject is made to conform to a new set of rules, abandoning all sense of individuality. They are trained relentlessly in a total immersion environment and the end result is a person who not only embraces the violence and the discipline, but accepts them as normal and an essential survival skill in a new and increasingly brutal world. (Metcalf et al. , 2011, p. 151) A very similar thing is happening to our children through violence in the media. At eighteen months old, a child can begin to understand and mimic what they see on television, and up until the ages of six or seven they are physically, developmentally, and psychologically unable to distinguish the difference between fantasy and reality. When they see an instance of rape, murder or degradation on the television or in the media, to them it is real. Some of them welcome the violence and accept it as a normal and vital survival skill in a cruel, new world. In nations, regions and cities where television is a constant source of entertainment, there is an immediate eruption of playground violence, and within fifteen years, there is a doubling of the murder rate, but why fifteen years? That’s how long it takes for a desensitized toddler to reach their â€Å"prime crime† years. Metcalf et al. , 2011, p. 151) By the time the brutalized toddlers have reached their teenage years, they have developed role models. Today, violence in the media is providing our children with role models. When the images of young killers are broadcast on television, they become role models. The media has every right and responsibility to tell the story, but they have no right to glorify the killers by presenting their images on television. (Grossman, 2000, p. ) The ultimate achievement for our children is to get their picture on television, and with such vulnerable, young minds they are willing to do whatever it takes to achieve that. I say it is time for the world to stop televising such violence and let law enforcement deal with it. If they know who the killer is then why does it have to be broadcast for our children to see? I truly believe that the media is highly responsible for a lot of killings in this world, along with the violent video games, and I pray that one day there will be something done to stop it.

Construction Essays | Value Management Risk

Construction Essays | Value Management Risk Value Management Risk Rationale for Study Throughout my 4th year of the Honours Degree Quantity Surveying Programme, I found the Value and Risk Appraisal module very interesting especially the topic of Value Management. I had never really come across this topic before and only heard the term used a few times but didn’t really know what was involved. From undertaking that specific module, it seems that Value Management is mostly used as a tool to achieve Value for Money for Clients. Working for a Contractor for 4 and a half years now, I have only ever seen Value Management used on one Construction Project and this is the one that I am currently based on just now. From my experience, I feel that Value Management has a lot of advantages for Contractors as well as Clients and I wanted to find out why it is not being used to a great extent by Contractors. Get help with your essay from our expert essay writers Indicative Title Value Management: A Contractors Perspective 1.3 The Aim To determine the reasons as to why Value Management is not being greatly used by Contractors in the Construction Industry. 1.4 The Main Objectives In order to achieve the above aim the following objectives must be met: To identify the key principles and elements of Value Management. To identify techniques and working practices adopted and to identify the benefits of Value Management. Examine the reason as to why Value Management is not widely used in the Construction Industry. Critical analysis of the views of Main Contractors about the benefits or short comings of Value Management. To propose recommendations for improved implementation of Value Management for Contractors. CHAPTER 2 LITERATURE REVIEW VALUE MANAGEMENT 2.1.1A Definition â€Å"Value Management is a style of management particularly dedicated to motivating people, developing skills and promoting synergies and innovation, with the aim of maximizing the overall performance of an organization.† The Institute of Value Management [online] http://www.ivm.org.uk/vm_whatis.htm Accessed on 18 July 2007. Value Management is a team based â€Å"process-driven† methodology. Its incentive is to deliver a product, service or project at â€Å"optimum whole life performance and cost without detriment to quality.† By using teams of experts in the Construction Industry, this allows the Value Management process to identify â€Å"design and construction solutions which offer the best value for money with regard to the functional requirements of the Client† Kelly, J. Male, S. (1988) A Study of Value Management and Quantity Surveying Practice Value Management plays a key role in the Construction Industry for continuous improvement and innovation. The Background Concept Value Management originated in the United States of America in the late 1940’s and the process was originally used in the manufacturing industry. This was soon adopted by the Construction Industry in the UK by the start of the 1990’s as various studies highlighted â€Å"between 36% and 45% savings on estimated construction cost to the Client† Kelly, J. Male, S. (1988) A Study of Value Management and Quantity Surveying Practice The concept of ‘Value Analysis’ was introduced by Lawrence Miles in the 1940’s. Miles, a Purchase Engineer working for the General Election, had to find ways to tackle the material shortages which was due to the Second World War. Miles sought to find alternative materials that would provide the same function. This proved effective as Miles found that many of the alternative products he was finding were of an equal, if not better quality than that originally proposed. In addition to this he found that many of these alternatives were at a lower cost. Dallas (2006) states that a short while later, people realised that not only did the technique provide a way to substitute alternative materials but it was also an excellent way to reduce costs while still maintaining the necessary functionality. This system would involve ‘value’ and ‘analysis’ and based on this Miles developed the definition of ‘Value Analysis’. â€Å"An organised approach to providing the necessary functions at the lowest cost.† Kelly, J.R. Male, S.P. Graham, D. (2004) Value Management of Construction Projects. To further enhance this Miles provides further definition: â€Å"Value Analysis is an organised approach to the identification and elimination of unnecessary cost.† Kelly, J.R. Male, S.P. Graham, D. (2004) Value Management of Construction Projects. Key Principles of Value Management The institute of Value Management states that the key principles of Value Management are different from other styles of management in that they include attributes that are not normally found together: Management Style Emphasis on teamwork and communication A focus on what things do, rather than what they are (functional approach) An atmosphere that encourages creativity and innovation A focus on customer’s requirements A requirement to evaluate options qualitatively to enable robust comparisons of option Positive Human Dynamics Teamwork – encouraging people to work together towards a common solution Satisfaction – recognizing and giving credit Communication – bringing people together by improving communication between them Fostering better common understanding and providing better group decision support Encouraging change – challenging the status quo and bringing about beneficial change Ownership – the assumption of ownership of the outcomes of Value Management activities by those responsible for implementing them Consideration of External and Internal Environment External conditions – taking account of pre-existing conditions external to the organisation over which managers may have little influence Internal conditions – within the organisation there will be existing conditions which managers may or may not be able to influence Degrees of Freedom – the external and internal conditions will dictate the limits of potential outcomes and should be quantified. Effective Use of Methods and Tools Means of achieving outcomes The Institute of Value Management [online} http://www.ivm.org.uk/vm_whatis.htm Accessed on 18 July 2007 From this we can see that Value Management brings Construction teams together and gets them to communicate more effectively with each other, this in turn will have a beneficial effect on the Project. The functionality of a Project will be more focused on being able to achieve Value for Money. Value Management Techniques Function Analysis ‘Function Analysis is a powerful technique in the identification of the principal functional requirements of a project’ Seeley, I. (1997) Quantity Surveying Practice. Second Edition. Function analysis is basically a brain storming session with all people involved in the construction project and is used to determine the main needs of a project in order to focus on alternative options that are less expensive although still achieving the functionality as required. FAST Diagrams Seeley (1997) states that the FAST (Functional Analysis System Technique) has evolved from the functional analysis approach as it establishes a hierarchy of functions in order of importance. FAST diagrams are a more effective way of showing the main important functions and needs of a project. Bolton (2002) stated that function analysis was key to success in a workshop and always uses a FAST diagram. Pasquire and Mauro (2001) cite Norton and McElligott (1995) who suggest that the use of FAST may provide more benefit in the early stages of a project but not so much in the construction phases. It is also highlighted that FAST diagramming requires experience and training on the part of the facilitator to ensure it accurately depicts the function of the project. Another constraining factor is the time required to complete FAST diagrams. Hunter, K. Kelly, J. (2006) Is One Day Enough? The Argue for Shorter VM/VE Studies. Value Management Workshops Value Management Workshops are one of the main techniques of Value Management. This will be discussed in greater detail in Chapter 2.2. Benefits of Value Management After several post-project reviews with Contractors and Consultants, Kelly Male identify various positive aspects of the Value Management process. The most significant of these are: Proof that the initial design was indeed the best Peace of mind to the owner that he was receiving good value for money Introduction to higher quality products Best up-to-date technology at least cost A clear focus on project objectives An alternative view of the design Improved project programmes Improved site management structures An opportunity for a detailed analysis of the required project Kelly, J. Male, S. (1988) A Study of Value Management and Quantity Surveying Practice. The Institute of Value Management indicates that Value Management has already been successful in achieving Value for Money for such Clients as BP, British Airways, Pfizer, Stanhope and various water and rail companies. This has resulted in the public sector adopting Value Management techniques in order to cut down construction costs and achieve better Value for Money. Benefits of Value Management according to the Institute of Value Management focus on greater communication and understanding within the Construction team but do not seem to focus on the cost benefits; Better business decisions by providing decision makers a sound basis for their choice Improved products and services to external customers by clearly understanding and giving due priority to their real needs Enhanced competitiveness by facilitating technical and organisation innovation A common value culture thus enhancing every member’s understanding of the organisation’s goals Improved internal communication and common knowledge of the main success factors for the organisation Simultaneously enhanced communication and efficiency by developing multidisciplinary and multitask teamwork Decisions which can be supported by the stakeholders The Institute of Value Management [online} http://www.ivm.org.uk/vm_whatis.htm Accessed on 18 July 2007 ‘Sir Michael Latham’s report ‘Constructing the Team’ (1994) states the benefits of Value Management and includes Value Management as a factor which is critical to the success of projects in providing the basis for improving value for money in construction.’ Hogg, K. (1999) Value Management: A Failing Opportunity? Nottingham, The Nottingham Trent University. Value Management is still not being used to a great extent in the construction industry despite the great number of benefits. ‘The reasons for the apparent hesitance of the industry to adopt Value Management on a greater scale are unclear since the benefits of Value Management appear to be widely recognised and the practice continues to be promoted at a high level.’ Hogg, K. (1999) Value Management: A Failing Opportunity? Nottingham, The Nottingham Trent University. Value Management Workshops ‘Before a VM workshop commences information has to be gathered to determine its objectives and deliverables and therefore what shape and form the workshop will take.’ Male, S. Kelly, J. et al (1998) The Value Management Benchmark: A Good Practice Framework for Clients and Practitioners Value Management Workshop Structure Kelly (1996), details the key stages involved in a Value Management Workshop; Value Management workshops are characterised by a three stage process: The Orientation and Diagnostic Phase in which the value manager prepares for the study by: meeting with the project sponsor and key players who will be involved in the study, reviewing documents, conducting interviews and briefings and preparing the agenda for the Workshop Stage. The Workshop Stage is where alternative or complementary views on the value problem are brought together through a structured team based activity facilitated by a value manager and progressed through the application of specific team based techniques. Innovative ideas are brought forward to satisfy the functional requirements identified against a backdrop of the value criteria uncovered. A workshop report will be produced including an Action Plan to ensure that value solutions and options will be implemented in the post workshop phase. The Implementation Phase in which the Action Plan is followed through by those responsible for the investigation and implementation of ideas. Kelly, J. (1996) Value Risk Appraisal Lecture Notes The International Benchmarking Study (1998) identifies the Implementation Phase as one of the key areas in which Value Management fails. At this stage the Value Management team have identified and adopted various approaches to ensure that the Value Problem is minimised as far as possible through various meetings and workshops in the previous phases. At this point an implementation strategy will be discussed with the relevant parties and if possible those involved in the implementation will be interviewed and identified in the action plan at the close of the workshop phase. Value Management Intervention Points There are three main stages of Value Management workshops and they all produce a great deal of information that is discussed between the Construction parties to find alternatives ways of constructing the building and focusing on achieving Value for Money. These stages are described on the next page. Strategic Briefing The Strategic Briefing stage deals with identifying the broad scope and purpose of the project and its important parameters. The focus is on determining the strategic needs and wants, and the role and purpose of the project for the Client. Project Brief The Project Brief translates the Strategic Brief into construction terms, specifying performance requirements for each of the elements of the project including spatial relationships and details: ‘A summary of the relevant parts of the Strategic Brief document The aim of the design. This would include priorities for project objectives The site, including details of accessibility and planning The size and configuration of activities Outline specifications of general and specific areas A cost centred budget for all aspects of the project including all elements of the construction project Servicing options and specification implications e.g. security, deliveries, access, etc.’ Kelly, J. (1996) Value Risk Appraisal Lecture Notes Outline Sketch Design The Outline Sketch Design (OSD) workshop is a value review of the initial plans, elevations, sections, specification and cost plan of the proposed building using the signed off Project Brief as a reference point. Kelly (1996) explains what should be involved in an OSD Workshop: ‘As statement of the design direction The site layout and access, identifying ground conditions and planning constraints A detailed cost plan and schedule of activities Dimensioned plans, elevations and sections An outline specification for environmental systems The risks and a risk management strategy The procurement plan The project execution plan with key milestones Performance measure.’ Kelly, J. (1996) Value Risk Appraisal Lecture Notes Benefits of Value Management Workshops This is an extract from a journal that describes the benefits from an actual Value Management workshop that took place: ‘All team members confirmed their commitment to continuous improvement. Only three did not feel that it had been as a result of the workshops. The team unanimously believed that more options had been explored within the team and all agreed to that being as a result of the workshops. A principal finding under the section of workshop effectiveness agreed to by all members of the team, was that the workshop provided a good basis for teamwork, created and atmosphere of equality, ensured open and frequent communication and focused the participants on action and achieving results. The team members that indicated team working, cultures and communications as issues prior to the workshops agreed that they had all been resolved through the facilitated workshops.’ Hunter, K. Kelly, J. (2006) Value Management Workshops and Partnering Conundrums. From this extract we can see that there is a great deal of benefits for all parties by using Value Management workshops. There are also advantages to a VM workshop if the environment is isolated, these include: It focuses the team on ‘the project’ Gestation occurs during the workshop process It commits the team Militates against partial attendance Continuity is ensured. Male, S. Kelly, J. et al (1998) The Value Management Benchmark: Research Results of an International Benchmarking Study RDT Pacific (2007) stated that there are other advantages of Value Management and Workshops. ‘Value Management consistently provides significant improvements to projects: Average capital cost savings of 14% (NSW Government Research) The forging of dedicated, synergistic project teams Auditing on the project brief and the decision making process Provision of additional functionality within existing budget allocations Development of a structured process to move projects efficiently to the next stage and ultimately completion.’ RDT Pacific [online] http://www.rdtpacific.co.nz/services/servicesportfolio/valuemanagement.shtml Accessed on 5 October 2007 From this research we can see that there is a great deal of benefits of using Value Management for all parties involved in a Construction Project. It is the intention of this research paper to find out why Value Management is not being used a great deal by Contractors and therefore this research will provide beneficial when it comes to interviewing Contractors on their views of Value Management workshops. A comparison will be made between the benefits and disadvantages of Value Management in the Research Analysis chapter in order to suggest suitable implementation of this process for Contractors. CHAPTER 3 RESEARCH METHODOLOGY 3.1 Secondary Method of Research The Secondary Research Method proposed includes investigating historic papers and publications to assess the extent to which Value Management is used in the Construction Industry. Information will be obtained from books, journals, websites and lecture notes. The Glasgow Caledonian Library will be used to obtain books. The RICS (Royal Institute of Chartered Surveyors) and various websites will be used to obtain journals and information on Value Management. These methods of research are being used as they are readily available. About 6 books from the Glasgow Caledonian Library were used for research and a lot of information was found, however, the negative aspect of using books is that the information may not be up to date. Lecture notes from the Value and Risk Appraisal were used for the Literature Review in order to explain the processes of Value Management. They were produced by Professor John Kelly who either wrote the notes from his own experience or took extracts from books. A great amount of information was found from the internet on Value Management and this was also used to prepare the Literature Review. Information from the internet can be up to date although the disadvantage is that it can be someone’s opinion and may not be entirely true. Journals on Value Management were found on the RICS website, Athens and also on the Construction and Building News websites. Some journal information was also taken from the Glasgow Caledonian Library. The advantage of Journals is that there was a lot of information available and people’s views are expressed which is helpful for determining any problems that exist in Value Management. This research will increase the author’s knowledge and understanding of Value Management and will also give an insight into the varying views on the subject. 3.2 Primary Method of Research The initial Primary Research Method proposed for this paper is to use actual Construction Project Case Studies in an attempt to find out how beneficial Value Management was for those projects. A few case studies were found on Projects that have used Value Management and they will be used to determine whether Value Management has been a success or not for the Project. Case Studies are useful for this research as they can be used to compare and also get people’s views on Value Management. A second Primary Research Method proposed for this paper will involve interviews with relevant Construction Industry personnel to gain their views and perspectives of Value Management in Construction Projects. Suitable candidates will be mainly Contractors who have worked with Value Management on their previous Construction Projects and also the Chairman of the IVM (Institute of Value Management) in order to achieve the objectives of this paper. The purpose of these interviews is to gain a greater insight into the Value Management process and how there can be an improved implementation for Contractors. It is important to choose the correct questions to collect data to prepare a relevant analysis. Interviews are better for communicating as you are face to face to a person and the interviewer is responsible for getting the quality of information that is required. A disadvantage of interviews however can be arranging meetings with the suitable candidates as they may not always be available when you are. To control this, contacting the interviewees at the earliest opportunity is always recommended. 3.3 Research Methodologies Rejected Having chosen the above methods for research it is important to note that alternative options such as questionnaires and electronic surveys were considered for potential sources of information. However, it was felt that these options would not provide the quality of response and feedback that the other methods would for this research. Questionnaires and electronic surveys would require time to fill in and most construction personnel would probably not have the time required to complete them or would simply disregard the emails or paper copies as they would feel it would be too time consuming. Another disadvantage of these research methods is that the questions could be interpreted the wrong way or the quality of answers could not be as good as asking someone in person. CHAPTER 4 PROGRESS TO DATE PLANNED FUTURE WORK Progress to Date At this stage, the indicative title, main aim and main objectives have been agreed. Research was undertaken throughout the summer on the topic of Value Management and the relevant materials were collected. Books, journals, case studies and website information were read and notes taken from each to form the basis for the literature review. The literature review has now been completed and also most of the information for the Date Analysis Chapter in the Final Dissertation report has been collected, such as books, journals, website information and journals. Everything required for the Dissertation Interim Report is now complete. 4.2Research Methodology The final piece of methodology to be collected will be from interviews with Construction personnel which are still to be agreed and also the interview questions need to be created. These are both due to happen at the start of the New Year and the planned interviews should take place towards the end of January 2008 at the latest. 4.3Research Analysis and Results Once the interviews have been conducted, an in depth analysis of the views will be undertaken, along with analysis of the information of other Construction personnel from the data collected via journals, case studies and books. This section will be undertaken from February 2008 4.4 Conclusions and Recommendations At this stage, it will now be time to come to a conclusion and give recommendations on how to implement Value Management for Contractors. This section will be undertaken near the end of March 2008. 4.5 Structure of the Final Dissertation Below is the structure proposed for the final Dissertation document to be submitted in April 2008. Chapter 1 – Introduction Chapter 1 introduces the rationale for study of the dissertation topic and the indicative title. It also determines the main aims and objectives, the research methodologies to be used and a structured breakdown of each chapter. Chapter 2 – Value Management Chapter 2 will focus on the background of Value Management and mainly on the key principles, techniques and advantages and disadvantages of this topic in the Construction Industry. Chapter 3 – Value Management Workshops Chapter 3 will focus on value management workshops in the Construction Industry and highlight the main advantages and disadvantages of this approach for Contractors. Chapter 4 – Value Management in Previous Construction Projects Chapter 4 will focus on case studies of previous construction projects that have used Value Management. They will be used to determine whether Value Management has been beneficial or not in the completion of the Projects. Chapter 5 – Research Analysis and Results Chapter 5 will analyse the information and feedback obtained from the interviews to be conducted. Chapter 5 will also compare the responses to identify the differences in opinion. Chapter 6 – Conclusions and Recommendations Chapter 6 will set out the conclusions that have been established with reference to previous chapter literature research and the interview feedback responses. Chapter 6 will also discuss to what extent the aim and objectives have been achieved in this research paper. The author will finally give recommendations for improved implementation of Value Management for Contractors. References This section provides a list of all references used for this research which are quoted within the paper and will also provide readers with the sources of views and opinions expressed as a follow-up or extended research on the topic. Bibliography This section will provide a list of all other references used in preparation of the paper but not directly quoted. Appendices The appendices section shall provide the reader with supplementary information to that provided within Chapters 1 to 5. Programme of Future Work Produce research questions for interviews – Start January 2008 Conduct research interviews – End January 2008 Data Analysis of interview results other research methods – February 2008 Conclusions and recommendations – End of March 2008 Final Dissertation hand in – April 2008 LIST OF REFERENCES Dallas, M.F. (2006) Value Risk Management: A Guide to Best Practice Hogg, K. (1999) Value Management: A Failing Opportunity? Nottingham, The Nottingham Trent University. Hunter, K. Kelly, J. (2006) Is One Day Enough? The Argue for Shorter VM/VE Studies. Hunter, K. Kelly, J. (2006) Value Management Workshops and Partnering Conundrums. Kelly, J. Male, S. (1988) A Study of Value Management and Quantity Surveying Practice Kelly, J. (1996) Value Risk Appraisal Lecture Notes Kelly, J.R. Male, S.P. Graham, D. (2004) Value Management of Construction Projects. Male, S. Kelly, J. et al (1998) The Value Management Benchmark: Research Results of an International Benchmarking Study RDT Pacific [online] http://www.rdtpacific.co.nz/services/servicesportfolio/valuemanagement.shtml Accessed on 5 October 2007 Seeley, I. (1997) Quantity Surveying Practice. Second Edition. The Institute of Value Management [online] http://www.ivm.org.uk/vm_whatis.htm Accessed on 18 July 2007. BIBLIOGRAPHY Adam, E. (1993) Value Management: Cost Reduction Strategies for the 1990s Dallas, M.F. (2006) Value Risk Management: A Guide to Best Practice Hogg, K. The Nottingham Trent University (1999) Value Management: A Failing Opportunity? Kelly, J. Male, S. (1988) A Study of Value Management and Quantity Surveying Practice Male, S. Kelly, J. Fernie, S. Gronqvist, M. Bowles, G. (1998) The Value Management Benchmark: A Good Practice Framework for Clients and Practitioners Male, S. Kelly, J. Fernie, S. Gronqvist, M. Bowles, G. (1998) The Value Management Benchmark: Research Results of an International Benchmarking Study Seeley, I.H. (1997) Quantity Surveying Practice The Institute of Value Management [online] http://www.ivm.org.uk/vm_whatis.htm Accessed on 18 July 2007.