The Recycling Of Metals Engineering Essay

The Recycling Of Metals Engineering Essay In our report we are discussing about recycling of metals and why we go in for recycling it. Also we have chosen five metals namely steel, aluminum, copper, lead, and tungsten which are recycled efficiently during the recycling process and discuss about the method of processing and benefits of recycling process. Metals play an important part in modern societies and have historically been linked with industrial development and improved living standards. Society can draw on metal resources from Earths crust as well as from metal discarded after use in the economy [1]. Metals are highly recyclable materials because their intrinsic properties dont change much on repeated recycling. If we increase their reuse and recycling the metals have a potential to improve resource productivity, and to reduce energy use, some emissions, and waste disposal. Improper recovery of metals from the economy increases reliance on primary resources and can impact nature by increasing the dispersion of metals in ecosystems. What is metal recycling? Metal recycling is the process of reusing old metal material, mainly aluminum and steel, to make new products. Recycling old metal products uses 95% less  energy  than manufacturing it from new materials [2]. Why metal recycling? It is easy and cost-effective to recycle metal, and metal can be recycled continuously without losing its properties. Therefore recycling metal reduces the environmental impacts associated with metal mining and production.   2. Materials and Methods a. Aluminum Aluminum is the most abundant metal in the world and also one of the most recycled a fact that can be attributed to the strong price it commands in worldwide commodities markets. It is estimated that over 50% of aluminum cans produced will be recycled, with some countries having a recovery rate of greater than 90%. Aluminum is a sustainable metal because of its high recovery rate and recyclability, with 2/3 of all the aluminum ever produced in use today. i. Applications of aluminum Electrical conductors, transport, packaging, building and architecture, miscellaneous applications such as high pressure gas cylinders, machined components, sporting equipment, road barriers and signs and lithographic plates ii. Recycling of Aluminum The recycling of aluminum provides many environmental and economic benefits. Aluminum recycling saves a substantial amount of energy. Aluminum is a sustainable metal and can be recycled repeatedly for any number of times. It is also the most valuable recycled product that we humans consume. The marketing of aluminum enables the municipalities to reduce some of the cost of recycling of other less valuable products, which provides an economic necessity to recycle. In these days, it is cheaper, faster and more energy saving and also efficient to recycle aluminum than the olden days. Aluminum, being 100 percent recyclable can be recycled indefinitely. The process of recycling aluminum cans is described below [3]; Aluminum cans and other such wastes are collected from house wastes and by municipal garbage. Using a device called eddy current separator, the wastes are sorted when it arrives to company. The eddy current electrically charges and causes it to repel from the device in to a sorting stream and then is passed on in to an awaiting bin. Then these are condensed into highly dense, briquettes weighing 30-pound or bales of 1,200-pound. This is then shipped off to aluminum companies for melting and further processing. Once the condensed briquettes and bales arrives to the aluminum companies, it is shredded, crushed and torn off of their inside and outside decorations through a simple process of burning. Then, these palm sized pieces of aluminum are loaded into furnaces for melting, where the recycled metal is blended along with the new, virgin aluminum. Aluminum is melted and then poured ingot moulds and is cast in to ingots. It is then arranged in to 25-foot long ingots that weigh over 30,000 pounds. These ingots are then fed into rolling mills which reduce the thickness of the metal from about 20 inches into sheets that are about 10/1,000 of an inch thick. These metal sheets are then coiled and shipped to can makers that produce cans and other related products. These processed cans are then delivered for the filling of beverages to companies. Molten furnaceThe filled cans are then distributed to stores and supermarkets for sales. The consumers then consume it and is then put in to bins or collecting centres. Then the cans enter the recycling cycle and the whole process repeated. A used can gets back in to the stores shelves in as little as 60 days. Reverse mill products aluminum Aluminum plant plant Aliuminum plant process scrap Used aluminum products Aluminum ingot output Ingot cast Molten aluminum Aluminum scrap are collected iii. Applications of recycled aluminum Transportation Equipment, Containers and Packaging, Construction Materials, Durable Goods iv. Benefits of recycling aluminum [4] Conserves energy Manufacturing aluminum from virgin ore consumes a huge amount of energy in each and every step from metallurgy to casting which increases our dependence on fossil fuels. Recycling aluminum saves 92 percent of the energy needed to produce aluminum from bauxite ore. A single aluminum can, when recycled saves the amount of energy that is equivalent to the energy that is needed to power a television set for 3 hours. Conserves raw material Main source for the aluminum industry is the aluminum scrap because of its recycling nature. The recycled aluminum saves 4 tons of bauxite ore and 1,500 pounds of petroleum coke and pitch for every ton of re-melted aluminum instead of extracting. Reduces Pollution Recycling aluminum requires only less energy than manufacturing so, it means reduced greenhouse emissions. Also it reduces secondary effects on the environment, such as global warming and acid rain. Therefore recycling aluminum instead of extracting virgin ore eliminates nearly about 95 percent of air pollution and 97 percent of water pollution. b. Copper Copper is the ancient and most used metal by man. After iron and aluminum, copper is the most leading metal produced in the market. Copper is very commonly used in electrical and plumbing applications. Since number of electrical components are used in our day to day life, the application of copper increases day by day. Copper is used directly or as an alloy with iron (Bronze). Many ancient aircrafts are made of bronze. Most of the raw materials have alloys added to their base metal. i. Applications of copper Comparing to other metals, copper is more often used in its pure form than alloys. Copper have high resistance to corrosion and high electrical and thermal conductivity in the pure form which makes it suitable for most of the electrical, heating and plumbing applications. ii. Recycling of copper Casting the molten metal Temp 11600C into billets Molten furnace 99% pure Cu Extrusion process into tubes Collection and sorting of the scrap In Europe, 41% of copper for its applications are obtained from recycling [5]. Recycling of copper is done by the following steps. The scraps rich in copper are waste electrical and electronic equipments, old taps, plumbing pipes and scraps from copper/copper alloy production and manufacturing. So these scraps are first collected, sized and sorted. These sorted scraps are then melted, casted and then made into new copper products. When the copper scraps are received for recycling, it is first visually inspected, graded and analyzed chemically if necessary. Loose scraps are baled and stored until processed. High grade copper scraps are melted directly, but in some cases it is brought to higher purity when it is in a molten state while refining. It is then followed by deoxidization and then casted into billets or ingots for further production process. Temperature is reduced to 6000C optimal extrusion Wired into different diameters for several applications iii. Benefits of copper recycling [5] Environment Continuous mining may reduce the strength of the soil. The refining process will emit some dust particles along with some waste gases such as sulphur dioxide etc which will have some harmful effects on the environment. Even though many copper producers are involved in minimizing these harmful effects (sulphur dioxide is captured and used to make sulphuric acid) it is not possible to eliminate them completely. So the recycling process will enhance for this as a whole. Landfill costs If the used materials are not recycled, it will be sent for landfills. It is same in the case of copper where the non recycled copper materials are dumped as a whole in the earth called landfill. Once if we are continuously involved in increasing the content of landfill, it becomes very difficult to dispose those materials if it becomes full. Energy saving In general, the energy required for extracting one ton of copper from its ore is approximately 100GJ. But the energy required for producing same amount of copper from recycling is only 10GJ, which is only 10% of the energy needed for extraction. This results in saving a number of valuable reserves such as coal, natural gas etc. Conservation Currently 12% of known copper resources have been mined. However the number is finite and it makes sense to conserve these ores by recycling. The recycling efficiency of copper is about 40 to 60%. Economics Recycling copper is very economical compared to mine and extract new copper. Recycled copper saves 90% of the cost of the original copper which obviously helps to keep the cost of copper products down. c. Steel Steel  is an alloy mostly consists of  iron and carbon  content between 0.2% and 2.1% by weight [7]. Steel is normally produced by smelting iron ore which is a commercial process where it contains more carbon and to become steel, it must be melted and reprocessed to reduce the amount of carbon and other elements are added, the liquid is then  continuously cast  into long slabs or  cast  into  ingots .Steel is mostly used in engineering and construction materials. It is very friendly to the environment and completely recyclable due to high durability, less energy consumption. i. Applications of steel Iron and steel are most widely used in the construction of roads, railways, other infrastructure appliances and buildings.Steel is used in variety of other  construction  materials, such as bolts,  nails, and  screws [10]. ii. Recycling of steel The unique magnetic properties of steel make it an easy material to recover from the waste so it can be recycled. The properties of the steel remain unchanged no matter how many times they are recycled. Steel recycling saves 75 percent of the energy which would be used to create steel from raw materials, enough to power 18 million homes. Over 65 percent of the steel produced in the U.S. is recycled into new steel every year. Steel is recycled in the following process. Collecting: The steel scraps are collected first from the companies; households etc†¦Then are taken to the recycling industry. Shredding: After it has reached the recycling plant the collected scraps are shredded into pieces. Magnetic Separation: The shredded pieces reach the magnetic separation process where the steel is attracted to magnet and gets separated from other metals. De tinning:   Steel cans normally have a layer of tin on them, where tin can is recycled on its own. This is usually carried out in specialized steel company, such as a steel mill or a scrap dealer. Melting: The separated steels scarps are the kept in a furnace for melting and hence the melted steel is casted and rolled into flat sheets.   Reformation:   Once the steel is in sheet form, it can be molded into products such as new steel cans, car parts or construction materials. Steel can be recycled infinitely without losing its strength or quality. iii. Applications of Recycled steel The recycled steel are used in appliances, Bridges Cans, Cars/trucks, Construction materials, Desks, File cabinets, Fire hydrants, Guard rails, Utility poles. iv. Benefits of recycling steel [9] Conservation of Natural Resources The recycling process in less expensive when compared with the manufacturing and also ecofriendly. Therefore using scrap steel helps preserve natural resources and energy. According to the Steel Recycling Institute, for every ton of steel recycled, 2,500 pounds of iron ore, 1,400 pounds of coal and 120 pounds of limestone are conserved. By recycling, the steel industry also conserves a huge amount of energy, thus the energy can be used for other useful purposes. Landfill Space Recycling steel helps in saving landfill space by diverting steel from the waste stream. Reduces Air and water pollution Manufacturing steel from its virgin ore involves the emission of greenhouse gases, which contribute to global warming. Therefore using recycled steel generates 85 percent fewer emissions. Using scrap steel as a raw material in a steel mill can diminish water pollution by 76 percent and its mining waste by 97 percent said by Institute of Scrap Recycling Industries. Economically Advantageous Recycling the old steel into new steel than manufacturing steel completely from virgin ore is more profitable. d. Lead Lead is an element with a symbol Pb and has an atomic number of 82. It is very soft and malleable in nature. It comes under the category of heavy metals. Lead as a metal has a bluish-white color when it is freshly cut, but the color soon tarnishes to a dull grayish color when it is exposed to air. Lead forms in to a shiny chrome-silver luster when it is melted into a liquid. Melting point of lead is 327.46 degree Celsius and a boiling point of 1749 degree Celsius. It is also known for its density which is 11.34g/cubic meter. Another important property of lead is that it is resistant to corrosion [11] i. Applications of lead Lead is used in ballast keel of sailboats and also in scube diving belts due to its property of high density. It is also used to cast small arms and ammunition and shotgun pellets. Lead is also used in printing. Since it is a non corrosion metal it suitable for outdoor applications when in contact with water. It is used in statues and sculptures and also in construction industry. Apart from all these, more than half of the worldwide lead production is used as electrodes in the lead-acid battery used extensively as a car battery. ii. Recycling of lead [13] Following are the recycling process. Receiving Batteries and recyclable raw materials are unloaded, weighed and sent to raw material processing center. Separation Batteries are broken apart in the hammer mill, and separated into three main components-leads, plastic and acid-by screening and gravity separation. Each component moves into a separate processing stream. Containment After initial processing, recovered lead and other lead wastes are stored in a specially designed containment building with a double-lined floor and leak-detection system. Purification The Waste water purification and treatment system neutralizes, purifies and converts the sulphuric acid into a pH- neutral liquid that is safely released into the sewer system. Smelting and refining After the lead is melted in blast furnaces, we mix the reclaimed lead with other materials to produce lead alloys. Casting Refined lead is poured into molds and cooled. Ingot molds come in three size large blocks (hogs), rectangular bars (pigs), and tube-shaped (billets). iii. Benefits of recycling lead Mining of lead requires energy of about 1000 TJ whereas recovering of lead from batteries and other sources requires only about 12.9 TJ. We clearly see that we save nearly 77 times the energy in the recovering process. Recycling lead also releases less amount of carbon dioxide when compared to the process of mining of lead from ore. To be accurate, recycling process gives 1.5Kt CO2 while the mining process gives 163Kt CO2 .This clearly shows the reduction in the amount of emission of green house gases to more than 100 times. Mineral resources are saved. Land resources are also saved from making it in to landfills. Lead recycling gives almost 100% efficiency. e. Tungsten recycling [14] Tungsten is a chemical element with a chemical symbol W and an atomic weight of 74. Tungsten is a whitish-gray metal and is one of the heaviest metals that have the highest melting point of any element except carbon; excellent high-temperature mechanical properties. The average concentration of tungsten in the Earths crust is estimated to be approximately0.0001%. The available ores for extracting tungsten are Scheelite (CaWO4) and Wolframite [(Fe, Mn) WO4].The leading use was as tungsten carbide in cemented carbides are use to make cutting tools and also as wear-resistant components by the construction, metalworking, mining, and oil drilling industries. Tungsten alloy or pure tungsten metal contacts, electrodes, and wires are used in electrical, electronic, heating, lighting, and welding applications. Tungsten alloys and composites are used as a substitute for lead in bullets and shot. Tungsten chemicals are used to make catalysts, corrosion-resistant coatings, dyes and pigments, fir e-resistant compounds, high-temperature lubricants, and phosphors. As on today, the market rate for the tungsten ore is $16.25 per pound. This clearly shows the demand and the necessity for the metal. We have seen previously that only 0.0001 percent of ore is present over the earths crust and the price too being very expensive brings about the necessity of recovering and recycling from used mediums. This can save a lot of resources, energy required for mining ores and its processing to get the metal. Thus we clearly see recycling and recovering serves a great way for saving tungsten recourses. i. Recycling process Recycling of tungsten has been done since early 90s. We evidently are having a good progress in this recycling process. There are many ways to recycle the metal. But it depends on the type of scrap we choose to recover it from. The types of scraps are given below: Old scrap It consists of tungsten-bearing products that are worn out. Used cemented carbide parts like metal cutting tools, some tungsten metal and tungsten alloy parts from electrical equipments. Old super alloy scrap includes used turbine blades and other parts removed from jet engines. It also includes some tool steel components. New scrap It is generated during the processing of tungsten concentrates, scrap, and chemicals to make metal powder and during the fabrication of tungsten products from these materials. This includes hard scrap consisting of solid pieces, such as sub specification alloy parts and cemented carbide parts, soft scrap consists of fine particles, such as bag house dust from steel and alloy manufacture. Unrecovered scrap It represents tungsten in scrap that has not been recycled. Some of its examples include burned out lamps and lighting fixtures, electrical contact disks, land filled spent catalysts and low-grade grinding swarfs, non collectable carbide parts, tungsten carbide hard facing materials, and welding electrode stubs. Processing of alloy scraps The oxidation-reduction process is the preferred method for recycling tungsten heavy metal alloy turnings and powders. In this direct recycling process, the scrap is oxidized by heating it in air at 800 ° C, milled and screened, hydrogen reduced between 900 ° to 1,000 °C, screened, blended, and then mixed with virgin heavy metal alloy powder to make a ready-to-press powder for the production of new products. Processing of cemented carbide scrap Cemented carbide producers supply scrap directly to converters, who return recycled powders to them for reuse. The processing method involves oxidation followed by alkali leaching. Cemented carbide scrap could be recycled by semi direct methods, such as acid leaching, bloating followed by leaching, electrolysis, or leach-milling. Processing of pure tungsten powder scraps Pure tungsten metal scrap could be recycled by using the following method. Electrolysis, which uses the scrap as an anode in an electrolytic solution, then chemical processing in which melting is followed by oxidation-reduction. Processing of thoriated tungsten scrap Thoriated tungsten electrodes are also used in a variety of high-performance and special application lighting products, such as high-intensity discharge lamps. The scrap is oxidized in air and then either reduced with iron by using a silicothermic or aluminothermic process to make ferrotungsten or processed chemically to make APT. The thorium oxide, which ends up in the slag in the production process is sent to a low-level radiation depository. Cleaned thoriated tungsten powders, solids, and turnings, which are generated as new scrap during the production of thoriated tungsten products or, in the case of solids, as old scrap by consumers, are processed by using the oxidation-reduction method. ii. Benefits of recycling tungsten †¢Recovering tungsten this way enables us to save two-third of energy we spend for mining new tungsten from the ore. That is we spend only one-third of energy for recovering Tungsten when compared to mining. †¢Recycle efficiency of tungsten is 66% †¢CO2 emission is sustained there by contributing its merit to green house effect. †¢Saves mineral resource i.e 0.0001% of tungsten in earths crust What are the Benefits of metal recycling? Get paid for you give to scrap metal recycling facilities. Emission of green house gases gets reduced. Aluminum and steel can be recycled repeatedly. Decreases environmental damage caused by mining Conserves land and water resource. Things to be done The secondary metal production is been affected by environmental regulation through laws that control emissions and govern the classification and treatment of metal-loaded wastes. Also industry must develop better technology to isolate and recover maximum value from metals in waste streams, and governments must institute policies that remove barriers to their economically and environmentally. Only through a cooperative effort can society recover a maximum amount of metal from the industrial/social system to benefit the environment. Conclusions Recycling of metals helps us to make sustained use of metals. It conserves energy, natural resources, therefore reduces pollution. Due to the unique valuable properties metals will remain an integral part of future industrial society. Decades of increased productivity and more efficient technologies for metals production and use has decreased the share claimed by the primary and secondary metals industries. Many recycling techniques should be carried out so that the environmental benefits gets increasing on the reliance on secondary metal production include conserving energy, landscapes, and natural resources, and reducing toxic and nontoxic waste streams. If every country embraces it, a global impact will be achieved.

Modifying Aerodynamics Around Tall Buildings

Modifying Aeromechanicss Around Tall Buildings Abstractions:Wind is a really powerful and unpredictable force impacting tall edifices worldwide. Its burden additions with tallness and is more frequently sudden and in altering waies. Additionally it creates immense force per unit area differences on different sides of the edifice. It is going progressively hard to defy its force by construction entirely. A better option is to understand the aeromechanicss around it and plan the signifier of the edifice in such a manner that air current can bring on the least impact. So today we can see that by utilizing wind tunnel engineering and other advanced engineerings, the edifice signifiers are altering from consecutive rectangular blocks to more curving and streamlined signifiers. The rule behind this is to debar or steer as much air current as possible to cut down its impact on the construction of edifice. This can be achieved by corner alterations, tapering and reverses, supplying gaps through the edifice or by sculpting the tops. Somet imes the aerodynamic survey of the site helps in placement of the edifice as in instance of Burj Khalifa. Not merely this survey helps to extenuate the force on windward side but besides reduces whirls on the leeward side therefore minimising air current shadow zone. Besides attention should be taken that the design does non bring forth perpendicular air current impetuss which can do prosaic accidents. There are some proposals for steering these high velocity air currents at such highs to power the edifice. So the following coevals skyscrapers will be an interdisciplinary merchandise of architectural, structural and aerospace technology Fieldss. This is a new construct and is being successfully used in design of today tallest edifices. ( ILGIN, 2006 ) KEYWORDS:Aeromechanicss, Wind Tunnel Engineering, Vortices, Tall Building, Wind Excitation. Table OF CONTENTS ABSTRACT†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦1 DECLARATION†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦2 ACKNOWLEDGEMENTS†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ †¦ .3 Table OF CONTENTS†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦4 List OF FIGURES†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦6 CHAPTERS†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦7IMPORTANCE OF AERODYNAMIC MODIFICATIONS †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.7Introduction to aerodynamic modifications†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦..7Research question†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦..9Aims†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦..9Aims †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â ‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦9Scope †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦10Restrictions †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦10Research model †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦10TALL BUILDINGS †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦11Definition of tall edifice. †¦Ã¢â‚ ¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.11Development of tall edifices †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦..11WIND LOADS †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦..15Wind lading on construction †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.15Nature of air current †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦16Variation of air current velocity with tallness †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦16Vortex-shedding phenomenon †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦17Along wind gesture †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦18Across air current gesture †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.18Cladding force per unit areas †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦18Wind tunnel technology †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦19Wind tunnel trials †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.20Pedestrian air current surveies †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦..†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦21AERODYNAMIC MODIFICATIONS AGAINST WIND EXCITATION †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦..24Sculpted edifice tops.†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.24Tapered signifier†¦ †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦..25Corner alterations †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦25Addition of gaps through construction †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.25CASE STUDIES †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ . 26Burj Khalifa: secondary instance survey †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.. 26Wind clime survey †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ . 28Wind lading on chief construction †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ . 29Pedestrian air current environment †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ . 30Co nclusions†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ . 30Taipei 101: secondary instance survey †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.. 31151 Incheon tower: secondary instance survey †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ . 33CONCLUSIONS †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ . 35BIBLIOGRAPHY †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ . 36 PLAGIARISM REPORT †¦ †¦ †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ 38 List OF FIGURES Figure 2.1. Monadnock Building, Chicago, USA. †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ 11 Figure 2.2.Impact of air current along the tallness of the edifice †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ 12 Figure 2.3.Structural systems with increasing tallness. †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦..13 Figure 2.4. Fluid flow form around different basic forms †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦14 Figure 3.1. Weave force per unit area around a edifice †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦15 Figure 3.2. Variation of air current velocity with tallness †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦17 Figure 3.3. Weave pattern around rectangular edifice †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦17 Figure 3.4. Weave pattern around rectangular edifice –vortex†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦18 Figure 3.5. Wind Tunnel Testing Of Petronas Towers †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.. 20 Figure 3.6.a Vortex Excitation on Tapered Spire –Mode1†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ 21 Figure 3.6.b. Vortex Excitation on Tapered Spire –Mode1 †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦..†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ 21 Figure 3.7. Design considerations for prosaic air current surveies: ( a ) downwash to street degree ; ( B ) high air current countries at the ground-level corners ; ( degree Celsius ) a big canopy ; ( vitamin D ) big daiss ; ( vitamin E ) recessed entry ; ( degree Fahrenheit ) an arcade or an unfastened columned place under a edifice ; ( g ) corner entry †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ 23 Figure 4.1. Corner alterations †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ 25 Figure 5.1. Burj Khalifa †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦..†¦ 26 Figure 5.2. Plan View of Burj Khalifa Tower †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦..†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ . 28 Figure 5.3. Vortex Formation around the Tower †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.. 29 Figure 5.4. Taipei 101 tower †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ 30 Figure 5.5. Plan View of Taipei 101 †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.. 31 Figure 5.6. Tuned Mass Damper in Taipei 101 Tower †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.. 32 Figure 5.7. Full Rendered View of Incheon Tower †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ 34IntroductionIntroduction to aerodynamic alterationsWorlds have ever competed with each other to demo their domination, power, endowment, etc. in different Fieldss with different types of looks. One such marked look is by edifices monumental edifices which have ever grown vertically to mean their importance. Every progress in tallness comes with a new set of jobs. Everytime a new engineering or thought is required to traverse the hurdle and each clip it happens that a new harvest of such constructions utilizing such engineering are raised wherever economic system licenses. Earlier the tall and monumental edifices were meant for the intent of idolizing ( temple and cathedrals ) , garnering ( public halls ) and other intents ( like pyramids for entombment ) . So the considerations were that of structural stableness. But today, they are even used f or commercial every bit good as residential intents, so the challenges like the residents comfort have added to the list. ‘As Grecian temples and Gothic cathedrals are the representative edifice types of their several periods, tall edifices and skyscrapers are seen as the best representative illustrations of industrialised society. They have compounded the human inherent aptitude to construct of all time higher, self-importance and competition, and the economic demands of get bying with the denseness of urbanization.’ ( ILGIN, 2006 ) . In today’s clip, it is merely impossible to conceive of any major metropolis without tall edifices determining its skyline. They are most celebrated landmarks of metropoliss ( besides because they can be located from far off ) , laterality of human inventiveness over natural universe, assurance in engineering and a grade of national pride ; and besides these, the importance of tall edifices in the modern-day universe is without uncertainty of all time increasing despite their several undeniable negative effects on the quality of urban life. The feasibleness and desirableness of tall edifices have ever depended on the available stuffs, the degree of building engineering, and the province of development of the services necessary for the usage of the edifice. Therefore, advances in structural design constructs, analytical techniques, and a more sophisticated building industry, in concurrence with the high-strength lightweight stuffs have made it possible to build really tall, much more slender and lightweight edifices at a surprisingly low cost premium compared to conventional building. ( ILGIN, 2006 ) However, every progress in tallness comes with a new trouble and therefore the race toward new highs has its ain challenges. Intelligibly, the increased flexibleness and decreased weight make non supply sufficient anchorage and makes modern-day tall edifices much more vulnerable to environmental excitements such as air current, which leads to horizontal quiver. Since air current can make inordinate edifice gesture, the dynamic nature of air current is a critical issue, negatively impacting tenancy comfort and serviceableness. Excessive edifice gesture can, make noise and cleft dividers, damage non-structural elements such as drape walls, cause spectacless to interrupt, cut down fatigue life, malfunction of the lifts and equipment, and consequence in structural amendss or even prostration. Therefore, the utmost quiver is a greater concern for both users every bit good as interior decorators of modern tall edifices, and inordinate acceleration experienced at the top floors during frequent windstorms should be kept within acceptable bounds to minimise uncomfortableness for the edifice residents and to avoid these sorts of unwanted events. Many researches and surveies have been done in order to extenuate such an excitement and better the public presentation of tall edifices against air current tonss. Hence, different design methods and alterations are possible, runing from alternate structural systems to the add-on of muffling systems in order to guarantee the functional public presentation of flexible constructions and command the air current induced gesture of tall edifices. An highly of import and effectual design attack among these methods is aerodynamic alterations in architecture. It comes into drama when the structural portion of the edifice can no longer defy sidelong air current forces without any major structural alterations and design and at the same clip without significantly increasing the cost of the undertaking. Aerodynamic alterations include alterations of building’s cross-sectional form and its corner geometry, sculptured edifice tops, horizontal and perpendicular gaps through-building to let air current to flux past the edifices with effects on the edifice construction and tegument. In this survey we will look on some of tall edifices and how their design was modified by aerodynamic surveies. By altering the flow form around the edifice, i.e. an appropriate pick of edifice signifier, moderates wind responses when compared to original edifice form. Equally far as air current burden and resulting gestures are concerned, for tall and slender edifices, the form is critical and a regulating factor in the architectural design. Intelligibly, tall edifice design requires a alone coaction peculiarly between the designer and the applied scientist. This interdisciplinary attack to deciding edifice planning, building, and usage issues plays a critical function. Furthermore, wind safe tall edifice design begins with the designer, and so, the influence of the air current action must be considered from the really beginning of the architectural design procedure of tall edifices. Designs created by the designer should be such that it allows for the aerodynamic alterations to take topographic point without compromising other facets of design particularly its country. Therefore, skyscrapers of the following coevals should be the merchandises of coaction, in peculiar between the architectural, structural and aerospace technology Fieldss without victimising the architectural design. But first we will understand the nature of air current and its importance at higher degrees from the land and besides some basic rules of fluid kineticss ( as air current is a fluid ) .

The Hidden Gem of Ielts Essay Bad Samples

The Hidden Gem of Ielts Essay Bad Samples Your writing also needs to be quite easy to read and all facets of it are managed properly so as to guarantee Coherence and Cohesion. Take a look at the questions and become familiarized with topics you would get on the true exam. At this point you discover that you cannot continue the program. You've got a full-time job and you're also doing a part-time evening program. Ok, I Think I Understand Ielts Essay Bad Samples, Now Tell Me About Ielts Essay Bad Samples! Basically however, the concept is to refrain from making assumptions that very few or no acceptable folks would make. Another reason teachers are needed is as they can teach young people important abilities and values. When selecting a definition, remember that there are many kinds of ethical arguments and that the manner in which you argue for your specific claim depends in large part on how you define your terms. The very first portion of making this kind of argument is no rmally establishing that we have a tendency to care about and sympathize with different humans. It's unquestionable there are several added benefits of advertising. The use of rather expensive advertising media is additionally an awful advertising strategy that results in low high quality promoting essay. It surely has a very important role in our lives. Firstly, virtual friendships that are formed online might not be genuine. From that point, you would attempt to demonstrate that the action which you're claiming to be unethical somehow violates that moral obligation. Mind-independent obligations are often known as objective obligations. You would then have to supply an argument which demonstrates that a specific mind-independent moral obligation exists. You would have to first provide an argument for the presence of mind-independent moral obligations. Ielts Essay Bad Samples Quite simply, an ethical argument tries to prove that a particular issue is either morally right or wrong. Please remember that the subsequent examples only represent a small section of the distinct ethical arguments that philosophers have made throughout time. On the flip side, you may make a particular statement. Not all points need to be covered in the identical quantity of words, but at least mention them. So you've got to compose an essay for whichever one that you pick, but the other part is different based on which module you're taking. Another thing to bear in mind about assumptions is that the number of assumptions you're in a position to make depends in large part on the scope and duration of your paper. There's a general description at the start and end of the answer. At the conclusion of the sections you also get a while to look at your answers. There are plenty of advantages to playing computer games. Many people discover that it's hard to be considering learning new things. The more the media gives attention to a specific topic, more are its odds of getting attention by the usual person. On the positive side, travel is the easiest way for individuals to experience a new culture and find out how other folks live. The New Angle On Ielts Essay Bad Samples Just Released The author acknowledges it is a simultaneous submission. You don't need to discover some complicated ideas. You ought to use words that aren't typical in an everyday conversation. The Foolproof Ielts Essay Bad Samples Strategy From a personal perspective, computers can help young individuals to learn more regarding the world. In summary, it's obvious that computers are now part of our normal life. In the present modern world, computers are an indispensable part of normal life. As they are becoming a common tool for teaching, teachers should be more aware of their role as guides in the acquisition of knowledge rather than transmitters of facts. Utilizing a computer every single day can have more negative than positive consequences on children. Physical activity is vital for the general development of children. Children who may use the computer when they're young have more confidence than other children. What You Should Do to Find Out About Ielts Essay Bad Samples Before You're Left Behind General Task 1 questions are composed of 3 unique components. To know where you're making mistakes, you can take advantage of Writing Correction Service. You've got to demonstrate how well you're able to summarise factual details. Media must function as a watchdog.

Forensic Science and Miscarriages of Justice Article Review - Free Essay Example

Sample details Pages: 9 Words: 2720 Downloads: 8 Date added: 2017/06/26 Category Law Essay Type Argumentative essay Level High school Did you like this example? Forensic Science and Miscarriages of Justice: Some Lessons from Comparative experiences Introduction à ¢Ã¢â€š ¬Ã…“Forensic Science and Miscarriages of Justice: Some lessons from Comparative experiencesà ¢Ã¢â€š ¬Ã‚  It is written by Kent Roach, is Professor of Law at University of Toronto. He is former Director of Research for the Inquiry into Pediatric Forensic Pathology in Ontario (2008). The article is a critical analysis of NRC report[1] with comparative experience[2] of administration of Forensic Science in United Kingdom, Canada and Australia. Don’t waste time! Our writers will create an original "Forensic Science and Miscarriages of Justice Article Review" essay for you Create order The NRC report mainly focused on its recommendation of federal regulation of the forensic labs, which is governed by state governments and police departments. This article pointed out some issues related to effects of not taking contemporary other systems of regulations of forensic sciences in consideration for comparative study as it might have revealed some unique challenges which may be faced by United States, as challenges related to radical decentralization of administration of criminal justice system and forensic sciences and another challenges related to disciplinary defragmentation of the forensic science without taking scientific and regulatory issues in account. Limitations This article review is mainly focused on the issue of miscarriage of justice which may take place due to this novel and ever developing science. As present article has some limitations in research pertaining to Indian scenario, this article is mainly focused on system and regulation of forensic sci ences and criminal justice system in United States whereas, my study and research is inclined toward administration of forensic sciences and criminal justice system in India. In this article review I have tried to make a comparative analysis of U.S. criminal justice system and forensic science with India Chapter -1 Administration of forensic Sciences in India and a comparative analysis with United States and United Kingdom In this article recommendations of the NRC report[3] and their relevance, some observations of authorà ¢Ã¢â€š ¬Ã¢â€ž ¢s himself and effects of some changes which are recommended by this report are critically analyzed in four parts. In the first part this article author examined the issues related to fragmentation of forensic science discipline by discipline and jurisdiction by jurisdiction. As administration of forensic sciences in The United States is taken care by the State authorities not by the federation, which is as suggested, are required to be go verned by federal government. A common regulation system of forensic sciences and monitoring is recommended by this NRC report. The monitoring structure not only includes the quality assurance but also monitoring of courtroom testimony and languages used in those proceedings. In India the administration of forensic sciences is done by central government as well as by State governments. For this purpose four major Central Forensic Science Laboratories were established and later on three other laboratories were also established. Four out of these seven laboratories handles different disciplines of the sciences. Six laboratories are governed by Directorate of Forensic Sciences Services under Ministry of Home Affairs and one i.e. CFSL Delhi is controlled by Central bureau of Investigation.[4] States in India also have their own forensic science laboratories governed by state government itself under control of Police organization[5]. The major criticism faced by Indian system of regul ation of forensic is that it is in tutelage of police organizations and as criticized by Dr. T.R. Baggi former Director of Hyderabad CFSL that, à ¢Ã¢â€š ¬Ã…“police used and continue to use forensic science if it suits themà ¢Ã¢â€š ¬Ã‚ .[6] There is no access of expert science to the accused and this may cause prejudices to the justice. A requirement of monitoring is always felt. It is necessary to understand the need of court and what is being supplied to the court. In this field a few steps are taken. In United Kingdom For the purpose of quality assurance better resources, training, research governance and independence of the science lab appointment of Forensic Science regulator was made who is not only be responsible for quality assurance but also for hearing the complains regarding the same. This mechanism does not provide for the continues monitoring of courtroom testimony including the misleading languages. In India Directorate of Forensic Science Services in responsibl e for quality assurance as well as grievance redressal but there is no third independent body to monitor the use of sciences. Chapter à ¢Ã¢â€š ¬Ã¢â‚¬Å" 2 Impediments to the development of Forensic sciences in India A very rhetoric comment made by Dr. T.R. Baggi[7] that forensic science in India is an ornamental and cosmetic utility of the investigation agencies[8]. It is very much true with regard to Indian Forensic science administration system and criminal justice system that it is mainly used to support the prosecution story. It is not being utilized in its own right with the full thrust to help the investigating law enforcement agencies and the criminal justice system. It is showcased and remembered only when major and sensational crime occur to satisfy the inquisitive and demanding media and citizens Forensic Science became a very isolated stream of science which has some specific sections as Ballistics, Chemistry, Physics, Toxicology, Computer sciences etc. This k ind of Disciplinary fragmentation, which is common in many countries like U.S., U.K., Australia and India, resulted in stagnation. Because of the improper vision, outlook and obsolete policies forensic science has failed to progress when compared to other disciplines of pure and applied sciences.[9] There is a requirement of giving freedom, encouragement and better infrastructure to this field of science and by this it can develop as other branches of pure and applied science as computer science, space science, atomic science etc. In the NRC report also more emphasis is given on avoiding disciplinary fragmentation and rejoining this stream with applied science. Forensic Science in India is suffering from lack of resources, man power, poor infrastructure, and absence of proper national policies and support. Poor infrastructure and lack of better career opportunities became reasons for forensic labs not being able to attract talented scientists. There is requirement to provide huma n resources to this field and for this purpose forensic science education system has to be revived.[10] In the field of forensic science education only two universities were offering masters, research and Ph.D. programmes till 2008[11]. These institution were in tutelage of police organizations and administration due to which not exposed to the scientific culture and due to that these institutions couldnà ¢Ã¢â€š ¬Ã¢â€ž ¢t develop like scientific organization. In the Perspective plan for Indian forensics presented to Ministry of Home Affairs in 2010[12], some suggestions as to development of forensic science in India were made and accepted by government also. For the purpose of infrastructural development three new FSLs[13] were established in Bhopal, Guwahati and Pune. These labs are suffering from lack of infrastructure and depleted manpower. In that particular report one suggestion as to the privatization of the forensic laboratories was made. This suggestion was made by looki ng at developed nations, but the issue remains that it is perilous and any compromise will jeopardize the whole criminal justice system in the country. Private sector in developed nation is being used to the minimum extent, as their own systems and labs are fully developed which is not the case with India.[14] Chapter à ¢Ã¢â€š ¬Ã¢â‚¬Å" 3 Importance of adopting foreign experiences Two cases firstly Daubert and secondly Paul Morin cases raises some very fundamental questions before the criminal justice system that, what should be admissible and what is not? And another is up to what extent court can rely on those testimonies. Forensic science work as aid to the criminal justice system increases the quality of evidence produced and certainty of proof but there always remains a chance of error. Up to what extent this error is acceptable and up to what extent injustice is acceptable. Such cases produce challenges in application of sciences before every nation where science is b eing used as an aid to justice. Indian Forensic Science stream is suffering from both lack of technological advancement and infrastructural development. In such system there are greater chances of errors and it may jeopardise whole criminal justice system in country. In this situation it is very much required to utilize the foreign experiences and find ways to minimize error in administration. In the fourth part of the paper relevance of the Daubert v. Merrell dow Pharmacuticals Inc.[15] case was examined. A à ¢Ã¢â€š ¬Ã‹Å"comparative experienceà ¢Ã¢â€š ¬Ã¢â€ž ¢ of adoption of principles laid down in this case by Canada, is examined with respect to United States, which is reluctantly accepting the contribution of principles laid down in Daubert case[16]. In this case two persons Jeson Daubert and Eric Schuller who were born with some birth defects of limb reduction. The birth defects were caused due to their mother who had taken a particular drug which was prescribed for morn ing sickness (Bendectin). They offered expert testimony at trial. That particular testimony had not been published and the research had only been done after the beginning of litigation. Whatever decided by the court is known as Daubert Guidelines. This case gave some effective and precautionary guidelines for the admissibility and strict assessment of expert opinion and proposed witness. These guidelines were though very strict but very necessary to remove slightest possibility of wrongful conviction. Court observed that prior to the admission of expert opinion it should be ascertained that derivation of findings must be based on scientifically valid principles, it has been generally accepted in scientific community, it has been and can be tested, and it must be peer reviewed and published and the most important of these guidelines is that whether known or potential rate of error acceptable? Author in the second part of the article pointed out some questions on quantification of error rate and reliability of expert opinion. As NRC report suggested the establishment of quantifiable measures of reliability and accuracy of forensic analysis and quantifiable measures of uncertainty in the conclusion of forensic analysis.[17] This was questioned previously in Ontario Pathology Report by Justice Stephen Goudge.[18] He put some precise question that how would Pathologists quantify and express the degree of certainty behind their opinion about cause of death?[19] He also pointed out that legal standard of proof beyond a reasonable doubt has no relation with science and medicine. This report explores the difficulties of subjecting forensic pathology to the quantifiable measures of reliability and uncertainty that the NRC recommends be developed for all the forensic sciences.[20] Justice Stephen Gaudge recommended for a multidisciplinary work to be done for better understanding and accuracy. This NRC report gave two reasons for its pessimistic view on Daubert case[21 ], firstly that appellate court defer to admissibility decision made by trial judges and secondly that stricter admissibility standards, when applied in criminal cases, generally excludes expert testimony offered by accused.[22] This threshold reliability of expert requires assessment of (i) reliability of the proposed witness; (ii) the field of science, (iii) opinion offered in particular case with the attention paid to the limits of the proposed witnessà ¢Ã¢â€š ¬Ã¢â€ž ¢s expertise and the language used to express opinion. This type of strict assessment is generally applied in case of novel scientific development and leading cases in which evidence produced by the accused. A wrongful conviction is more grave injustice than wrongful acquittal. As forensic science is a novel stream and this ever developing technology explores not only future horizons but also strikes down the old technologies and their conclusions. In Paul Morinà ¢Ã¢â€š ¬Ã¢â€ž ¢s case[23], Guy Paul Morin was convicted for the charge of rape and murder of a 9 year old girl in 1984. At the trial court he was acquitted but later on convicted by appellate court. The appellate court gave importance to the expert testimony of hair and fiber analysis which found from Morinà ¢Ã¢â€š ¬Ã¢â€ž ¢s car with the deceased girl and solely on that basis he was convicted. Later on new DNA profiling technique developed and he on his own expenses got tests done and produced report in court. On this development court observed that previously used technology was very much irrelevant and not competent to be admitted as evidence in the court. DNA test conclusively made clear that DNA of girl and hair recovered from Paulà ¢Ã¢â€š ¬Ã¢â€ž ¢s car does not match. He was acquitted. Guy Paul Morinà ¢Ã¢â€š ¬Ã¢â€ž ¢s case was an example that how a peer reviewed research can also be misused or misinterpreted. It is not only lack of research but misinterpretation can also lead to wrong conclusion. As author of hair an d fiber analysis research testified in this case that their study had no relevance with the Paul Morinà ¢Ã¢â€š ¬Ã¢â€ž ¢s case. We can find that the same forensic science which is used as aid to criminal justice, in this way can works against the system. Later on Kaufmann commission[24] found that Forensic Centerà ¢Ã¢â€š ¬Ã¢â€ž ¢s role in conviction of Paul was substantial. The findings of the analysts were overstated and misunderstood by police, prosecutors, and the courts. Contamination problems were not disclosed. Later on it was accepted that such error rate should be used only for acquittal not for the conviction Chapter à ¢Ã¢â€š ¬Ã¢â‚¬Å" 4 Conclusion Forensic Science as an aid to the criminal justice system is very useful but any kind of error can also in this science can lead to injustice also. It was suggested in NRC report about defragmentation of disciplines of the forensic science and use of multidisciplinary disciplinary work to reduce error rate. It was sugge sted for reconciliation of this isolated stream of science with applied science. By this reconciliation of streams path for the new developments and new research will be opened and science as a whole become aid to the justice system. It is required that any testimony given as an expert opinion must be based completely scientifically established principles. For this purpose both court and prosecution must be aware about developing technologies, their uses and misuses. Some administrative changes in this field also can help in minimizing the chance of error. Such administrative changes are as Unified administration of Forensic science labs, establishment of monitoring mechanism for quality assurance. Some problem in forensic sciences are common to all systems and in such situations it is very important to observe experiences of others and learn lessons from them, because in this system there are no chances of commission of mistakes. Page | 1 [1] National Research Council Report, à ¢Ã¢â€š ¬Ã…“Strengthening the Forensic Science in the United States: A path forwardà ¢Ã¢â€š ¬Ã‚ 2009. Authored by Committee on Identifying the Needs of the Forensic Sciences Community, National Research Council [2] Comparative experiences refers to the similarities and differences revealed by the study of comparative law or jurisprudence. [3] Committee on Identifying the Needs of the Forensic Sciences Community, National Research Council Strengthening Forensic Science in the United States: A Path Forward available on https://www.nap.edu/catalog/12589.html [4] Central Forensic Science Laboratory (CBI) New Delhi (April 15 2014) https://cbi.nic.in/cfsl/about.htm [5] T. R. BAGGI à ¢Ã¢â€š ¬Ã‹Å"Revamping forensic science in Indiaà ¢Ã¢â€š ¬Ã¢â€ž ¢ The Hindu (May 24, 2008) This point was also inferred from official websites of various state forensic science laboratories Andhra Pradesh à ¢Ã¢â€š ¬Ã¢â‚¬Å" forensic science lab is in direct control of Director General of Police (15/4/2014 at 8.36 AM) https://www.apfsl.gov.in/organisation.html Madhya Pradesh forensic science lab is in direct control of Director General of Police (15/4/2014 at 8.36 AM) https://www.mppolice.gov.in/static/Fslsagar.aspx [6] Dr. T.R. Baggi à ¢Ã¢â€š ¬Ã…“Why is forensic Science is stunted and static in India?à ¢Ã¢â€š ¬Ã‚  The Hindu Sept. 11, 2011 https://www.thehindu.com/todays-paper/tp-features/tp-openpage/why-is-forensic-science-stunted-and-static-in-india/article2443599.ece [7] Former Director of Hyderabad CFSL [8] Supra note 6 [9] T. R. BAGGI à ¢Ã¢â€š ¬Ã‹Å"Revamping forensic science in Indiaà ¢Ã¢â€š ¬Ã¢â€ž ¢ The Hindu (May 24, 2008) [10] Supra note 9 [11] After 2008 few other universities also started offering courses in Forensic science as Panjab University, Banaras Hindu University, Gujarat forensic Science university etc. [12] Dr. Gopal Ji Misra Dr. C. Damodaran à ¢Ã¢â€š ¬Ã…“PERSPECTIVE PLAN for INDIAN FORENSICSà ¢Ã¢â€š ¬Ã‚  Final Report presented to the Ministry of Home Affairs Government of India JULY 2010 (April 15,2014) https://www.mha.nic.in/hindi/sites/upload_files/mhahindi/files/pdf/IFS(2010)-FinalRpt.pdf [13] Forensic Science Laboratory [14] Supra note 6 [15] Daubert et ux., individually and as guardians ad litem for Daubert, et al. Vs. Merrell dow pharmaceuticals, inc. 509 U.S. 579 (1993 ) [16] Ibid. [17] Supra note 3 pp 80 [18] Commissioner Stephen T. Gaudge Inquiry in to Pediatric Forensic Pathology in Ontario (April 13 2014) https://www.attorneygeneral.jus.gov.on.ca/inquiries/goudge/report/v1_en_pdf/Vol_1_Eng.pdf [19] Ibid. [20] Supra note 2 [21] Ibid. [22] Supra note 5, pp. 87 [23] R. v. Morin [1988] 2 S.C.R. 345 [24] Fred Kaufman, Report of the Kaufman Commission on Proceedings Involving Guy Paul Morin (1998)