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The fracture toughness and uniaxial tensile yield strengths of unmodified and CTBN-rubbermodified epoxies were measured under hydrostatic pressure. The purpose of these experiments was to learn how suppressing cavitation in rubber particles affects the deformation mechanisms and the fracture toughness of rubber-modified epoxy. It was found that the cavitation of CTBN-rubber could be suppressed ...

Single screw compressors (SSCs) have been used in many fields. Compared with other kinds of compressors, the SSC should have many advantages due to its symmetrical structure and well balanced radial gas pressure on the screw rotor. However, its durability is not as good as expected. After operating for several thousand hours, its flow rate often decreases sharply. The essential reason is that t...

A total of 24 subjects with diagnosis of spina bifida, 24 subjects (females, n= 12), ages 17 to 72 years, participated in a one-time arm ergometry exercise stress test. The aim of this study was to investigate the construct and concurrent validity of two rating of perceived exertion scales, the Borg 6-20 Scale and a newly designed WHEEL Scale in adolescents and adults with spina bifida. The res...

Fungi are the most frequently observed pathogens of mite populations, helping to control them on different crops. Twenty-five samples of leaves were collected from rubber tree plantations adjacent to two fragments of Cerrado vegetation. Each rubber tree plantation had 25 plants selected for sampling and seven leaves from around each tree top were collected up to seven to eight meters above grou...

Child running and jumping sound are one of the major noise sources in heavy structured apartment building. It was reported that physical characteristics of rubber ball (heavy/soft impact sound) was similar with child's running and jumping. As a standard impact source, rubber ball was standardized in ISO 10140 series and ISO 16283-2. However, evaluation method of rubber ball was not proposed in ...