The hypereutectic aluminium-silicon alloys AlSi25Cu4Cr and AlSi25Cu5Cr are heat treated T5, T6 T7. quenching of the was carried out under same conditions. Artificial aging at T5 a temperature 180º C for 2, 4 6h, 8, 10, 12 14h. artificial studied compositions T7 370º 20, 40 60 min. influence treatment on size, shape distribution primary eutectic silicon crystals in alloy structure investigated. ...

background physical activity is an important component of health in old age that provides personal independence, physical ability, and quality of life. objectives the current study aimed to evaluate physical activity and associated factors among the elderly population in kashan, iran. patients and methods this is a descriptive cross-sectional study. the sample was 400 elderly people (aged more ...

Introduction: Crosslinking of polyethylene has been known for decades to improve the abrasion resistance of the polymer for industrial applications. However, only three applications of this technology have been reported in use in total hip replacements in the orthopaedics literature by Grobbelaar et. al. [1], Oonishi et. al. [2], and Wroblewski et. al. [3]. Recently, the interest in highly cros...