MSE 313 Department of Materials Science and Engineering Spring 2005 Laboratory 7 Creep of Polymers Objective The aim of this laboratory is to demonstrate the phenomenon of creep in materials and its effect on the long term mechanical performance of materials. YOU MUST READ ASTM STANDARD D2990-01 BEFORE THE LAB Introduction Most of the materials experience time dependent permanent deformation as a function of time at a constant stress and this phenomenon is called creep
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cost and with greater accuracy. Relative humidity was once determined by measuring the change in moisture absorption in silk‚ human hair‚ and later‚ nylon and synthetics. Mechanical methods for measuring RH were introduced in the 1940s. Recently‚ polymer-based resistive and capacitive sensors have been developed Sensor Types and Technologies Recent developments in semiconductor technology have made possible humidity sensors that are highly accurate‚ durable‚ and cost effective. The most common
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Chemistry and cosmetics Cosmetics have been around since almost the beginning of time. Egyptian women used kohl to darken their eyelids‚ Cleopatra was even said to have bathed in milk to achieve a soft smooth completion. In Greece‚ women used lead carbonate (a white powder) to obtain a pale complexion‚ which probably wasn’t worth it seeing how it cost them their lives! Anyway‚ cosmetics are no modern phenomenon! Today it is a big business‚ making about $12 billion
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Water Treatment Plant Process- Chlorination or Ultraviolet Radiation By Shreya Shah Surface waters necessitate water treatment before consumption to guarantee no health risk is present to the user. Poor quality water which consists of dissolved and suspended particles‚ can impact and cause health risks to consumers. The most important contamination is the microbiological contamination as it leads to infectious diseases (Water Treatment‚ 1994). Chemicals such as nitrates and cyanide when contaminate
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I) INTRODUCTION * Industrial Chemistry deals with the preparation of products from raw materials through the agency of chemical change * Chemistry is important to Industry by: * Regulating manufacturing processes * Quality Control * Research and Development * Sources of raw materials from the natural environment 1) Lithosphere –Earth’s Crust 2) Hydrosphere – Marine and Oceanic Environment 3) Atmosphere – Air 4) Plants – Biosphere * Classification of Natural
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Indian Guar Gum Market ▪ India has been a major player in the context of guar and guar gum in the global market. ▪ India’s production contributes to 80% of the world’s total production figuring up to 6 lakh tons. ▪ Rajasthan wholly retains the credit for India’s position producing 70% of the production itself. ▪ Guar is largely consumed as a vegetable in the Indian subcontinent. It is also used in making pickles. ▪ 25000 tons of the total production in the country constitutes
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OPTION: BIODEGRADABLE Plastics Biodegradable plastic is plastic that has been treated to be easily broken down by microorganisms and return to nature. Many technologies exist today that allow for such treatment. Currently there are some synthetic polymers that can be broken down by microorganisms such as polycaprolactone‚ others are polyesters and aromatic-aliphatic esters‚ due to their ester bonds being susceptible to attack by water. Some examples of these are the natural poly-3-hydroxybutyrate
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its growth. SWOT ANALYSIS OF INDIAN PLASTIC INDUSTRY STRENGHTS | WEAKNESS | * Strong base in polymer * Low cost labour * High percentage of recycled plastic | * Low scale production * High cost of plastic for end-use application * Obsolete machinery * Poor industry image * Industry not focussed on exports | | | * Rising crude oil prices * Threat of polymer import from middle east * Strong processing industries in neighbouring countries * Environmental concern
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organic compounds are carbohydrates‚ lipids‚ proteins‚ and nucleic acids. These are monomers and they link together into long chains that form polymers. Different reagents can be used to find the presence of these macromolecules. Proteins are made of carbon‚ hydrogen‚ oxygen‚ nitrogen‚ and sometimes sulfur. Proteins are covalently bonded in chains as polymers of amino acids. These bonds are called peptide bonds. Amino acids linked together form a polypeptide called a protein. Some proteins are
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Connor Shortall AP Biology Vocabulary List for Chapters 1-5 Chapter 1 Properties of life a. Order: Molecules in living things are arranged in specific structures. b. Reproduction: Organisms will reproduce their own kind; life comes from life c. Growth & Development - DNA directs the pattern of growth and development‚ producing an organism that is characteristic of its species d. Energy Processing- Organisms take in energy though various methods and make it usable e. Response to the Environment -
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