We need to stop and think before we open the bottle and drink. Plastic water bottles and plastic in general, is destroying our environment. Here are some simple facts to help you see my point. In 2012 32 million tons of plastic waste was generated in the U.S., and that represents close to 13 percent of the total MSW (municipal solid waste) (U.S. Environmental Protection Agency, 2014). Out of the 32 million tons of plastic waste that was created in 2012 only 9% was recycled (U.S. Environmental Protection
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LIQUID METAL EMBRITTLEMENT (LME) RAGHAV MOHAN Graduate Student M.S in Technical Entrepreneurship and Management University of Rochester INTRODUCTION Liquid metal embrittlement (LME) is a phenomenon of practical importance, where certain ductile metals experience drastic loss in tensile ductility or undergo brittle fracture when tested in the presence of specific liquid metals. Generally, a tensile stress or a residual stress is needed to induce embrittlement. Many mechanisms
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English Grammar : Conditionals Quiz Fill in the blanks using the most appropriate conditional type. ------------------------------------------------- Principio del formulario 1. If he (have) more time, he (finish) decorating the baby's room before she was born. 2. Both parents and teachers (feel) pleased if students studied harder and got higher grades. 3. Even if I (do) well on the test tomorrow, I don't think I (pass) , for the teacher underevaluates my papers. 4. If the United
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of testing the tensile strength of various polymers. These tests were done to determine the material properties, such as modulus of elasticity and the ultimate strength. The polymers that were tested were an acrylic and a nylon sample. Each specimen was placed in a tensile test machine and placed under load until failure. This is an important test because polymers are very lightweight and strong materials and it allows uses for them to be discovered by knowing their tensile strength. After the testing
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stress and strain for various materials. The Stress-Strain Apparatus stretches (and in some cases breaks) a test coupon while it measures the amount of stretch and force experienced by the test coupon. Software is used to generate a plot of stress versus strain, which allows Young's Modulus, the elastic region, the plastic region, the yield point, and the break point to be ascertained. Theory The ratio of the force (F) applied to the cross-sectional area (A) of a material is called the stress:
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* Type 1 Polyethylene Terephthalate (PET, PETE) Uses: Soft drink, water and salad dressing bottles; peanut butter, and jam jars. * Type 2 High Density Polyethylene (HDPE) Uses: Water pipes; Hula-Hoop (children’s game) rings; milk, juice, and water bottles; the occasional shampoo / toiletry bottle. * Type 3 Polyvinyl Chloride (PVC) Uses: Juice bottles; cling films; PVC piping. * Type 4 Low Density Polyethylene (LDPE) Frozen food bags; squeezable bottles, e.g. honey, mustard; cling
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variable in this study was the number of times a product was chosen. The moderating variable in this study was the product type. A typical product can be classified into 2 general categories: geometric and material. A geometric object’s most dominant attribute is size or shape (eg. a book) whereas a material object’s most dominant attribute is texture, roughness, hardness, weight, temperature or part (eg. a cotton shirt). The researchers submitted a total of 4 hypotheses. The first 3 hypotheses were for
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MATS1101 Materials Strand/MATS9520 INTRODUCTION TO MATERIALS ENGINEERING Dislocations Ashby & Jones, Volume 1, Chapter 9 Ideal Strength of Materials Last week we saw that the slope of the interatomic force-distance curve at equilibrium spacing is proportional to Young's Modulus, E. Interatomic forces become negligible for r > 2r0. F ~2Fmax Fmax Attraction 0 Repulsion r0 2r0 r0 r0 ~1.25r0 2r0 r Figure 8 Interatomic force-distance curve The maximum in the force-distance
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Grading system and reporting Name: Institution: Course: Lecturer: Date: Question 1 Advantages of letter grading system • Concise and convenient • Grades are easily averaged • Easy to predict future achievements of students Disadvantages • Proportion of students achieved each grade varies from teacher to teacher • Does not indicate student’s specific strength and weaknesses in learning • Are a combination of achievement, effort, work habits and good behavior Advantages of pass-fail
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obtienen de estas combinaciones son superiores a la de los materiales que los forman por separado, lo que hace que su utilización cada vez sea más imponente sobre todo en aquellas piezas en las que se necesitan propiedades combinadas, en la que un material (polímero, metal o cerámico) por sí solo no nos puede brindar. Las propiedades que se obtienen son un producto de la combinación de los refuerzos que se utilicen y de la matriz que soporta al refuerzo en los materiales compuestos, el cual también
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