RUNNING SHOE

In a block copolymer, a long segment made from one monomer is followed by a segment formed from the other monomer. One example is the block copolymer formed from styrene and butadiene. Pure polystyrene is a transparent, brittle material that is easily broken polybutadiene is a synthetic rubber that is very resilient, but soft and opaque. A block copolymer of the two monomers produces high-impact polystyrene, a material that is a durable, strong, yet transparent plastic. A different formulation of the two polymers produces styrene-butadiene rubber (SBR), which is used mainly for automobile tires and running shoes, but also in chewing gum. 

Sneakers and running shoes are not appropriate unless the employee s duties require excessive walking or stand-up work, or when required by medical or health issues. Management shall retain the right to make specific exceptions as necessary. 

For the EVA foam midsoles of running shoes, the durability for repeated impact appears to improve with increased density. However the polymer conhibution to the impact response reduces after simulated (and real) use (a. 18), since wrinkles and some holes appear in the cell walls. Consequently these applications require high density foams. 

Some foam products are subjected to up to 10 major impacts in their lives, therefore a foam may need to be selected so that the performance is still adequate. Products, subjected to hundreds of thousands of impacts as in running shoe midsoles, were dealt with under fatigue. It appears that the higher density HDPE (419) and PP foams loose a significant amount of their protection after several impacts, but nevertheless it may be possible to use sufficient foam thickness to provide the required protection. If low density EVA foams are used, the impact energy densities are much lower, as the majority of the resistance is from compressing the cell gas. Ankrah and co-workers (33) performed multiple impacts on LDPE/ESI blend foams, and found... 

No.2, 2001, p.79-100 MODELING THE GAS-LOSS CREEP MECHANISM IN EVA FOAM FROM RUNNING SHOES... 

Kraton, the yellow rubber-like material often found on the bottom of running shoes, is a copolymer whose structural information is known. It is formed from a group of styrene units, i.e., a block of polystyrene, attached to a group of butadiene units, or a block of... 

Caproic acid, the substance responsible for the aroma of dirty gym socks and running shoes, contains carbon, hydrogen, and oxygen. On combustion analysis, a 0.450 g sample of caproic acid gives 0.418 g of H20 and 1.023 g of C02. What is the empirical formula of caproic acid If the molecular mass of caproic acid is 116.2 amu, what is the molecular formula ... 

This amount is analogous to the pressure exerted by spiked heels vs. running shoes on a sidewalk. 

What do tires and chewing gum have in common They are both made of elastomers any substance you can pull or flex. Elastomer molecules can be crosslinked, or chemically linked, to produce rubber that retains its shape. You can find elastomers and/or rubber in many everyday products, such as running shoes, tires, underwear, and bubble gum. 

She dropped it as realization swept over her. Not a trainer, but a running shoe. A woman s. 

The ancient Chinese proverb that a journey of one thousand miles begins with a single step has special meaning for people who want to get their blood pressure down. In fact, the worst thing an unfit person could do would be to put on a pair of running shoes and go out for a five-mile jog. Start slowly but surely. 

How would you like it if you were a doctor and a little old lady in Adidas running shoes asked you, "Hey, Doc, what about hydrogen peroxide in the treatment of myocardial infarction, cerebro-vascular accidents, and Clostridium Welchi septicemia " (You d probably punch her out.)... 

Making decisions about the quality of texts and events. (Ricky appreciates the beauty of the illustrations and appeal of the characters in The Lion, the Witch and the Wardrobe. Lisa rejects the subtle persuasion of a running shoe commercial.)... 

The value-based approach presumes that quality can be defined in terms of costs and prices. Garvin (1984b, p. 28) uses the following example to clarify this perspective [A] 500 running shoe, no matter how well constructed, could not be a quality product, for it would find few buyers. Reeves and Bednar (1994) emphasize that this definition of quality forces firms to concentrate on internal efficiency ( internal conformance to specifications ) and external effectiveness ( the extent to which external customer expectations are met ). However, this approach mixes two distinct, though related, concepts quality and value (Reeves and Bednar 1994). Because of its hybrid nature, this concept lacks definitional clarity and might result in incompatible designs when implemented in practice. 

This chapter contains three case studies. The first one on climbing rope illustrates the technology of fibre production and rope construction to meet specific mechanical property targets. There are some similarities between rope and the much smaller scale braided sutures used in surgery. Further sport case studies, on polymer foam protective gear and materials in running shoes, are mentioned in the Further Reading section. 

Mills, N. J., Running Shoe Materials, in Jenkins, M. J., Ed., Sport Materials, Woodhead, Cambridge, pp. 65-99, Chapter 4, 2003. 

Hunter, B., 2012. Nike Flyknit a seamlessly knitted running shoe. http //www.knittingindustry. com/nike-flyknit-a-seamlessly-knitted-runnmg-shoe-(accessed 20.12.13.). 

Orthotic support in this context is the mechanical support, or orthosis, that enables the range of motion of a given joint or joints, but limiting movement beyond the norm. Such support can be found in the ankle detail of a walking boot or running shoe. Issues that must be addressed when using an orthotic component are ... 

Caproic acid is the ehemieal name for the substance that is responsible for the eharacteristie odor of gym socks and old running shoes. Analysis of a sample of caproic acid reveals that it eontains 62.04% C, 10.41% H, and 27.55% O by mass. Another test shows that the molar mass of caproic acid is between 100 and 125 g/mol. Find the molecular formula for caproic acid. 

Now China makes, the world takes. Migrant workers cannot afford the jeans, jackets, running shoes, tennis rackets, and a seemingly endless assembly line of luxury goods exported to the west. But some see the humor in it. One worker in the film holds up a pair of jeans with a 40-inch waist. He grins. You can fit two people into these jeans. Only America can wear 40-inch waists. Says another worker, rocking back and forth on his train ride home Here is the difference between America and China. In China, if you make... 

Allergic contact dermatitis occurs most commonly from nickel-containing objects, plants (such as Rhus)y rubber, adhesives, or dyes in athletic tape, gear, or running shoes, and topical medicaments. Reactions are induced or elicited by the athlete s perspiration, which leaches the chemical allergens from their gear (Cronin 1980). Table 6 lists common contact allergens in the athlete and their recommended patch-test concentrations (Marks and DeLeo 1997). 

Running shoes and athletic gear contain rubber additives, accelerators, and antioxidants, which are common causes of contact allergy. Among the potential allergens are thioureas, thiurams, N-isopro-pyl-N-phenyl-p-phenylenediamine (IPPD), and me-... 

As mentioned earlier, warp-knitted spacer fabrics are used in most shoes. From the classic running shoe to more specialized barefoot-shoes, stability is the most important attribute. The connection between fashion and functionality can be implemented particularly well by the warp-knitted spacer fabrics. The sporting goods manufacturer Nike Inc., in Beaverton, Oregon, was the first to successfully establish a shoe with portions of warp-knitted spacer fabric and marketed it in the year 2002. 

The prototype monomer is a monosubstituted olefin with a substituent that can stabilize a negative charge. Typical monomers include butadiene, styrene, acrylonitrile, and methyl methacrylate. Mixtures of styrene and butadiene are used in running shoes, and described... 

Living Polymers for Better Running Shoes 795 Using C NMR Spectroscopy to Evaluate Polymer Stereochemistry 797... 

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