High Oil-absorptive Composites Prepared from Non-woven Fiber and Sponges with 4-tert- buty1styrene-EPDM-divinylbenzene Graft Polymer

4-tert-butylstyrene-EPDM-divinylbenzene graft terpolymer (PBED) was prepared by graft cross-polymerization in toluene using BPO as an initiator. The gel-PBED and solPBED were isolated from extraction of tetrahydrofuran (THF), and then they were identified by IR spectroscopy. The maximum oil-absorptivity of gel-PBED produced from the optinum reaction conditions was 8 420% but its swelling rate was very low. The highest oil-absorptivity of photocrosslinked sol-PBED film was 5 800%. Although its oil absorbency was not as high as gel-PBED' s, swelling rate was higher than that of gelPBED and was suitable for commercial purpose. After swelling in oil, neither gel PBED nor photocrosslinked sol-PBED film having high oil-absorptivity had sufficient mechanical strength to be taken out of oil wholly. As is known, composite technique is one of the useful methods for reinforcing them. Fibers, sponges and non-woven cloths were used as reinforcers or supporters in this work. Oil-absorptivities and swelling kinetics were evaluated by method ASTM (F726 - 81 ) and an experimental equation. The mechanical properties and the morphologies of some composites were measured by tensile tester and SEM , respectively.     

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液力变矩器性能特性的数学模型

通过对液力变矩器的性能特性进行分析，提出了多种形式的液力变矩器性能特性的数学模型，并以实例加以说明。     

光子计数的微比光自动测量系统

设计了一套用于实现极弱光实验过程中光强的自动检测系统，该系统地光子计数器和计算机接品同步触发，使每个计数循环后，光子计数器的模输出被计算机接口并进行模数转换以及数据贮存，然后自动开始新的循环。该系统了现 利用光子计数器中的人工记录的缺点。     

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如何减轻中小学生课业负担,给他们宽松的时间和空间,开展丰富多彩的体育活动,加强课外体育锻炼,使青少年健康成长,增强体质、提高身心健康水平,是为终生体育打基础的需要,是全面推行素质教育的需要。