piece of equipment with a flat‚ roughly triangular surface that‚ when heated‚ is used to press clothes to remove creases. It is named for the metal of which the device is commonly made‚ and the use of it is generally called ironing. Ironing works by loosening the ties between the long chains of molecules that exist in polymer fiber materials. With the heat and the weight of the ironing plate‚ the fibers are stretched and the fabric maintains its new shape when cool. Some materials‚ such as cotton
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Corrosion of Metals Introduction Have you ever had a bike that went rusty‚ figure 1? If the paint is scratched and the rust allowed to spread‚ it is very difficult to repair the frame so it looks as good as new again. Rusting costs us millions of pounds each year‚ either through replacing things or through trying to prevent it happening in the first place. Figure 1: Bike rusting. In this booklet you learn about rusting and ways of stopping it‚ followed by a look at another metal‚ aluminium that
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ability to identify metals is an extremely important one. With this ability‚ we can correctly assign different traits‚ and use the metal in its most suitable environment. This is important to many industries‚ where metals play an increasingly large role. Determining the identity of the metal is paramount to determining what conditions to use the metal under. This seemly simple task is‚ however‚ can be quite complex‚ as there are many ways by which one can identify a metal‚ each with varying amounts
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ca CAPACITY AND DEMAND MANAGEMENT Capacity can be defined as ‘the maximum level of value added activity over a period of time that the service process can achieve under normal operating conditions’. (Johnston and Clark‚ 2001) The essential task of capacity management is to look at the current performance of a service identify any bottle necks‚ understand the workload places on it and the underlying business drivers that may affects future traffic. The next task is to access the workload growth
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BEARING CAPACITY OF SOIL Dr. S. K. Prasad Professor of Civil Engineering S. J. College of Engineering‚ Mysore 7.0 Syllabus 1. Definition of ultimate‚ net and safe bearing capacities‚ Allowable bearing pressure 2. Terzaghi’s and Brinch Hansen’s bearing capacity equations – Assumptions and Limitations 3. Bearing capacity of footings subjected to eccentric loading 4. Effect of ground water table on bearing capacity 5. Plate load test‚ Standard Penetration Test‚ Cone Penetration
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Resources‚ Conservation and Recycling 21 (1997) 145–173 Metals recycling: economic and environmental implications Robert U. Ayres * INSEAD‚ Boule6ard de Constance‚ F-77305‚ Fontainebleau‚ France Received 17 July 1997; accepted 27 July 1997 Abstract We are in a period of economic transition. The ‘cowboy economy’ of the past is obsolescent‚ if not obsolete. Environmental services are no longer free goods‚ and this fact is driving major changes. Recycling is the wave of the (immediate) future
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Carrying Capacity 1. The carrying capacity is the size of a population that can live indefinitely using the resources available where that population lives 2. For example‚ consider an island onto which is dropped a colony of rabbits. As long as there is an adequate supply of food and water‚ the rabbits will not only survive but they will reproduce and the colony will get larger. 3. The rabbit population can continue to grow as long as food and water are adequate. However‚ if at some point‚ there
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Lure of precious metals: Precious metals were a major pull factor for the west because everybody was looking for the opportunity to become wealthy individuals which was known as the American dream at that time. Gold and silver was the metals that every single person was looking for in the westward expansion‚ immigrants and citizens were willing to kill to get their hands on any gold or silver mine. The killing‚ weirdly enough‚ was mostly was the removal of Indians. The India wars: War was inedible
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Heat transfer is a discipline of thermal engineering that concerns the generation‚ use‚ conversion‚ and exchange of thermal energy and heat between physical systems. Heat transfer is classified into various mechanisms‚ such as thermal conduction‚ thermal convection‚ thermal radiation‚ and transfer of energy by phase changes. Engineers also consider the transfer of mass of differing chemical species‚ either cold or hot‚ to achieve heat transfer. While these mechanisms have distinct characteristics
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Heat exchanger A heat exchanger is a device that is used to transfer thermal energy (enthalpy) between two or more fluids‚ between a solid surface and a fluid‚ or between solid particulates and a fluid‚ at different temperatures and in thermal contact. In heat exchangers‚ there are usually no external heat and work interactions. Typical applications involve heating or cooling of a fluid stream of concern and evaporation or condensation of single- or multicomponent fluid streams. In a few heat exchangers
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