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超高分子量聚乙烯的应用及改性研究进展 总被引:7,自引:0,他引:7
介绍了超高分子量聚乙烯(UHMWPE)的性能和用途,综述了提高UHMWPE加工性能和物理性能的物理改性、化学改性、聚合物填充改性以及自增强改性方法的研究进展,指出了其今后的发展方向. 相似文献
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为提高钛氧膜表面官能团密度,改善其血液相容性,特在其表面原位构建多羟基树状分子。本文通过合成11-羟基十一烷基膦酸(HUPA)后在钛氧膜表面进行自组装,通过依次重复利用传统的亲核取代反应等,制备三代端羟基树状表面。选用红外(FTIR)对HUPA的合成进行定性表征,利用扫描电子显微镜(SEM)进一步观察材料表面形貌并检测制备于氧化钛薄膜端羟基树状表面润湿性的改变,通过血小板粘附实验考量改性后钛氧膜的抗血小板粘附与激活的能力。采用纤维蛋白原粘附实验进一步测试改性材料的血液相容性。实验结果表明端羟基树状表面的制备有效改善了氧化钛薄膜的抗凝血性能,同时提高了材料表面的官能团数量,为后续的组装改性提供了条件。 相似文献
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近年来,黄冈职业技术学院机电一体化技术专业在加强硬件和软件建设的同时,形成了"做中学,做中教,教学做合一"模式,效果显著。本文主要讲述了在学校现有的条件下,如何开展一体化,来完成华中数控系统标准PLC的修改与调试。 相似文献
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随着工作面功率的加大,矿井电压过低造成设备启动困难或不启动现象,甚至造成欠电压跳闸,因此1140V电压等级升高到3300V将是煤矿发展的前进方向。 相似文献
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This paper is a critical analysis of behavioral modification techniques as tools for performance enhancement in the Nigerian Banking Industry. The overriding objective of the study was to determine the impact of behavior modification techniques on performance enhancement in the Nigerian banking industry. The specific focus was on selected banks in the Makurdi metropolis, Benue State. The study employed a simple empirical survey method with a view to eliciting relevant data for analytical purpose so as to answer several questions and to obtain the objectives of the study. Both primary and secondary sources were explored in a bid to attain data which were considered to be highly germaine to the investigation under reference. Five-point Likert scale rating questionnaire was used in obtaining the views and opinions of respondents (i.e. strongly agree-5, agree-4, undecided-3, disagree-2, and strongly disagree--l). Two hypotheses were formulated and tested. Non-parametric tools including simple percentages and Pearson Chi-square statistics were used due to their analytical simplicity and relevance. The study found that banks in Makurdi utilized behavior modification strategies translated to high organizational success or enhancement in a comparative sense. This was evident from the fact that the banks net profitability trends were observed to be upwards generically. In the light of the findings of the study, it is hereby recommended that proactive behavior modifications strategies rules guideline and the like be tailored along lines with greatest organizational profitability trends and performance enhancement profiles, both potential and actual. This will require rewarding productive behaviors that detect/report fraudulent acts with cash gifts, meritawards, prizes and discouraging unproductive behaviors such as fraudulent activities, absenteeism, drug abuse, alcoholic influences and lateness to work amongst others with punishment, extinction, and negative reinforcement. 相似文献
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对直接染料耐酸大红进行了接枝环氧丙基改性及染色研究,结果表明:改性后耐酸大红染料可以在酸性条件下对丝绸上染,上染率和固色率大幅度上升。在pH3,上染率和固色率达到83.23%和63.50%。最佳固色温度:90℃,最佳固色时间:40min,水洗牢度达到4~5级。表明对直接染料进行环氧丙基改性对提高丝绸的上染率和固色率以及色牢度具有良好的效果。 相似文献
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结合小型面粉厂短粉路工艺改造,强调完善清理设备和辅助设备的双重作用;对小型面粉厂改造必须考虑渣磨系统与清粉系统的设置与配合作用,实现联合精选物料,为前路心磨系统最大限度提供量多质优的纯净胚乳。 相似文献