A CASE STUDY ON THE EVOLUTION OF MOSQUITO REPELLENTS By:- Rajdeep Laha Calcutta Business School PGDM 2010-12 OVERVIEW Traditionally‚ various types of substances have been used to repel mosquitos. These include such things as smoke‚ plant extracts‚ oils‚ tars‚ and muds. As insect repellent technology became more sophisticated‚ individual compounds were discovered and isolated. This allowed the formulation of new‚ more efficient forms of mosquito repellents. The first truly effective
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(MMCs) Ceramic matrix composites (CMCs) 1.1.1 Advantages of composite materials • Low inert mass • Stiffness and strength tailored to application • Reduced manufacturing cost and improved fatigue resistance compared to metal structure. • Corrosion resistance • Availability for all tactical applications. 1.1.2 Application of Composite Materials The use of advanced materials‚ including composites‚ can result in significant weight and lifetime cost savings. Some of the applications as follows:
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Rebuttal: Should Animal Testing Be Banned (Pros): My fellow classmates‚ there are various emotional and factual reasons by animal testing in the United States should be banned. Many animals such as rats‚ hamsters‚ rabbits‚ cats‚ dogs‚ and primates languish in pain. For all you know the pet that you adopted could have been sent to a laboratory to undergo extremely agonizing tests. Many of these creatures are locked inside cold‚ barren cages in laboratories across the country. Much of these animals
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Boiler Basics Design and operation A boiler is an enclosed vessel that provides a means for combustion heat to be transferred into water until it becomes heated water or steam. The hot water or steam under pressure is then usable for transferring the heat for the steam requirements of process industries or for power generation. Combustion boilers are designed to use the chemical energy in fuel to raise the energy content of water so that it can be used for heating and power applications. Many fossil
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Imperfections Diffusion; Mechanical Properties Strengthening Mechanisms; Failure Phase Diagrams Phase Transformations Applications & Processing of Metal Alloys Struc.‚ Prop.‚ Proc.‚ Applic. of Ceramics Struc.‚ Prop. of Polymers; Composites Corrosion; Elec. & Thermal Prop. Magnetic & Optical Prop. Econ. & Envir. Issues Chapter 1‚2 3‚4 5‚6 7‚8 9 10 11 12‚13 14‚15‚16 17‚18‚19 20‚21 22 Lectures: will highlight important portions of each chapter. Chapter 1 - 3 Chapter 1 -
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alloys zinc has is brass. Like zinc brass dose not rust. It slightly loses its color sometimes‚ but it can regain it by being washed. The process of making zinc has a name. It is called Galvanization. Galvanization is when an object is put into corrosion‚ and is given a coating of molten zinc by dipping it into it. Galvanization is the process that turns other metals into zinc. A metal can be changed into zinc so it could be more efficient than what it already is. Zinc is one of the most common used
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officer take a paint sample from the exact part of the vehicle upon which the damage occurred. In reference to hit and run investigations‚ paint samples should be taken near the point of impact‚ but should not be taken from areas where there is corrosion or rust. This procedure can be done by the investigator by removing a painted section with a clean scalpel or knife blade. It is important for the knife or scraping instrument used to be clean in order to avoid any form of cross contamination
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Executive Summary The following is a thermal‚ mechanical and hydraulic design response report to a heat exchanger problem where ethylene glycol and a poor quality feed of water are put through a shell and tube exchanger with the objective of cooling the ethylene glycol feed. A shell and tube exchanger was chosen over several other exchangers due to its high efficient performance and its relative ease of maintenance in processing these fluids. From the data given and specific heat capacity researched
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Section A Multiple choice (17 marks) Do NOT Write on this section of the paper. Answer ALL questions in the table provided at the start of Section B Question 1. Which of the following best describes the structure of metals? A lattice of A. alternating positive and negative ions B. positive ions surrounded by freely moving electrons C. molecules held together by covalent bonds D. atoms held together by covalent bonds Question 2. Which of the following is not a property of most metals
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Machine and Equipment Monitoring Type of Maintenance | Advantage | Disadvantage | Corrective | 1. Good effectiveness | 1. Need expert | (Design-Out) | 2. Long life cycle of equipment | 2. High cost‚ and need time to study and develop equipment | Breakdown | 1. Good for equipment which is cheap and easy to fix | 1. No sign | (On-Failure) | 2. Used when the other types of maintenance cannot be used | 2. No planned shutdown | | | 3. Need inventory of parts | |
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