The damage characteristics of dry sand erosion of fiber in a hot environment are important for bag filters for garbage incinerators. In this study, we use a newly developed measuring device and evaluation method to investigate the erosion resistance of three types of fiber used for bag filters at a site in a hot environment. We found that the erosion resistance of all three types of fiber decreased as the ambient temperature increased. The erosion resistance of fiber in a hot environment is largely influenced by the decrease in fiber strength in such an environment.

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The polyimide nanofiber superior in heat resistance was made by the electrospinning process. We tried this nanofiber as reinforced material of the thermoplastic polyurethane elastomer (TPU elastomer). For comparison, commercial polyimide microfibers were examined by using them as reinforced material. We evaluated test materials composed of nanofibers of 450nm mean diameter made from 13wt% polyimide solution and those composed of nanofibers of 300nm mean diameter made from 10wt% polyimide solution. The improvement in both elastic modulus and breaking strength was confirmed for TPU elastomer composites reinforced by 1wt% polyimide nanofibers using a kneading method.

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In this paper, university female students′ opinions on consciousness towards choice of clothes for boys and girls were studied. The results were obtained by factor analysis and multiple regression analysis as follows: 1) The factor structure of female university students′ consciousness toward Boy′s wear is interpreted as (F 1) my taste, (F 2) individuality, (F 3) comfortable, (F 4) durability, (F 5) brand, (F 6) choice of boy, and (F 7) economics. 2) The factor structure of female university students′ consciousness toward Girl′s wear is interpreted as (FA 1) brand, (FA 2) individuality, (FA 3) comfortable, (FA 4) durability, (FA 5) fashionable, (FA 6) choice of girl, (FA 7) street clothes by brand, and (F 8) economics. 3) The results showed that those who value brand name clothes when purchasing their own clothes tend to choose brand name clothes for their daughters, too. However, they tend to go by their own preference when they choose clothes for their sons. 4) The results also showed that those who value ease of care and comfort when they purchase their own clothes tend to value comfort and durability when they choose children′s clothes, too.

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