Effects of curing condition of solution cast Nafion® membranes on PEMFC performance Korean J. Chem. Eng.26(3)‚ 679-684 (2009) Thickness of membrane ~ 50µm There are some disadvantages of the solution casting method that the cold cast films are generally mechanically weak‚ susceptible to crack formation and soluble in many polar solvents‚ especially in water at room temperature. Generally‚ the annealed films undergo morphological changes when heated above the glass transition temperature (Tg=109oC
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Marriott Corporation Evaluating the cost of capital 1. What is the weighted average cost of capital for Marriott Corporation? 1 (a) What risk-free rate and risk premium did you use to calculate the cost of equity? R (f)‚ or risk free rate used for calculating cost of equity was the Geometric Mean (GM) for LT US govt. bond returns (Exhibit 4). We used the overall GM of 1926-1987 of 4.27%. This is because this is the period that Marriott has been in operation and would be a good reflection
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Explain TPS‚ OSS‚ KWS‚ DSS‚ MIS‚ ESS‚ find information related to these systems from Internet and find how many companies provide such kind of system around the globe. Name top 5 companies who provide such systems also enlist the capabilities of these systems. Compare different vendors who provide each type of systems with respect to the functionalities and capabilities of these systems. Information systems (IS) is the study of complementary networks of hardware and software that people and organizations
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apply VSM systems case study: ABF Analysis of five internal VSM systems within ABF‚ gives me a clear view that these five internal VSM systems could help a company to manage complexity. The five internal VSM systems within ABF organization are: System 1: Operations There are there are three operational unites identified: Warehouse‚ transport and manufacturing unites of food products. System 2: Stability It is completely absent that the food market is filled with other competitors who
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Fundamentals of Information Systems Fourth Edition Chapter 2 Hardware and Software Principles and Learning Objectives • Information system users must work closely with information system professionals to define business needs‚ evaluate options‚ and select the hardware and software that provide a costeffective solution to those needs – Identify and discuss the role of the essential hardware components of a computer system – List and describe popular classes of computer systems and discuss the role
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In system theory‚ an open system is a system which continuously interacts with its environment or surroundings. The interaction can take the form of information‚ energy‚ or material transfers into or out of the system boundary‚ depending on the discipline which defines the concept. An open system is contrasted with the concept of an isolated system which exchanges neither energy‚ matter‚ nor information with its environment. The concept of an open system was formalized within a framework that enabled
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scientists like Dr Sivaramakrishna Chandrashekhar and Dr Subramaniam Chandrashekhar won laurels and recognition abroad and not in India. A typical example of bureaucratic interference in India is regarding the technology of growing ultra pure silicon crystals to make solar and other silicon cells that convert light into electricity. Two Indian Institute of Science scientists had developed the technology. In the early 80s‚ Mettur Chemicals (MetChem) in Mettur near Salem tried to install a pilot plant to
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Crystal Cave of Giants The Naica mine is located in Chihuahua‚ Mexico and was first discovered in 1794. The mines primary interest was silver and gold until about the 1900’s when a large-scale mining began as Zinc and Lead become more valuable resources. This is the largest mine in the country that produces lead‚ zinc and silver‚ among other minerals. The entrance is located 1385 m above sea level in the north of the 12km.-long sierra Naica. In April of 2000‚ brothers Elroy and Javier Delgado
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MATSE 259 Solutions to homework #2 1. For the HCP crystal structure‚ show that the ideal c/a ratio is 1.633. We are asked to show that the ideal c/a ratio for HCP is 1.633. A sketch of one third of an HCP unit cell is shown below. a c M L J K a Consider the tetrahedron labeled as JKLM‚ which is reconstructed as M L H J K The atom at point M is midway between the top and bottom faces of the unit cell __ that is MH = c/2. And‚ since atoms at points J‚ K‚ and
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ENGG250 MATERIALS ASSIGNMENT 1 20 marks DUE: 20 MARCH 2015 These are the sort of questions you can expect in the Class Test on 23 March. Completing this assignment should therefore be considered part of your preparation for the Class Test. (The Class Test will cover more material than the assignment). When you have completed the questions‚ make an electronic file from your answers (you can put together an electronic file‚ or scan your handwritten copy – as long as it is legible). Create a cover
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