Application of CO2 laser heating zone drawing and zone annealing to nylon 6 fibers

Nlon 6 fibers were zone drawn and zone annealed by using a continuous wave carbon dioxide laser to develop their mechanical properties. A laser‐heating zone drawing was carried out under a applied tension of 35.4 MPa at a power density of 9.65 W · cm^?2, and then the zone‐drawn fiber was annealed. A laser‐heating zone annealing was carried out in two steps at a power density of 9.65 W · cm^?2; the first step was carried out under 423 MPa and the second under 517 MPa. The treating temperature of the fiber heated by the CO₂ laser was measured by using an infrared thermographic camera equipped with a magnifying lens. The treating temperature at the zone drawing is 138°C, and those at the first and the second zone annealing are 121 and 125°C, respectively. The second laser‐heated zone‐annealed fiber has a birefringence of 65.2 × 10^?3, a degree of crystallinity of 54%, and a storage modulus of 21 GPa at 25°C. Wide‐angle X‐ray diffraction patterns for the laser‐heated zone‐drawn and the zone‐annealed fibers show (200) reflection and (002/202) doublet due to only an α form on the equator. The laser‐heated zone‐drawn fiber has a melting endotherm peaking at 216°C and a trace of shoulder on the higher temperature side of its peak, and the laser‐heated zone‐annealed fibers have a single melting endotherm peaking at 216°C. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 1711–1716, 2002     

骨组织工程支架材料

寻找理想的支架材料是目前骨组织工程研究的热点。本文对用于骨组织工程支架材抖的天然生物衍生材料、聚合物类材料、陶瓷材料及其复合材料等的研究现状进行综述，分析了这些材料的优缺点，并对骨组织工程支架材料发展趋势进行了展望。     

磷渣制备高C3S熟料的烧成机理研究

利用ICP、DTA、XRD、SEM和EDXA测试方法,研究了磷渣在制备高C3_S熟料过程中的作用机理。研究结果表明,磷渣对高C_3S熟料烧成的促进作用主要是由于磷渣中CaSiO_3的“晶核作用”。     

基于CDIO理念的《软件工程》课程建设研究

为实现面向能力的人才培养,在CDIO工程教育理论的指导下,从《软件工程》的工程性特点着手,讨论如何全面实施CDIO人才培养理念,以CDIO能力培养大纲为依据,以CDIO的人才培养模式指导课程建设,建立理论与实践相结合,多维度、立体化的《软件工程》课程内容体系,为培养具有国际竞争力的软件工程师奠定坚实基础。     

基于3dsMax与VRP镂空植物效果制作

针对在3dsMax中制作镂空植物因建模文件容量过大以及使用常用的镂空贴图方法而致使导人到VRP中的模型运行速度过慢,或出现图片数据丢失情况问题,简单介绍利用Photoshop软件图片处理功能,并结合3dsMax进行镂空材质贴图设置．设计一种将图片导入到VRP中最终实现植物镂空效果的制作方法,该方法可简化建模的制作过程,缩小图片对空间容量的占用,并能较好地逼真还原。     

案例教学方法在《土木工程CAD》教学中的应用

基于对《土木工程CAD》教学中案例教学方法存在的问题的分析,结合《土木工程CAD》课程教学内容,通过精心选择案例,在课堂教学、实训教学和课程考核中应用教学案例,改善课程教学效果。教学实践表明,案例教学方法的应用明确课程的学习内容,激发学生的学习兴趣,保证课程教学效果,提高学生分析和解决问题的能力。     

重组铜绿假单胞菌外毒素A工程菌发酵及表达产物的纯化

目的建立稳定、高效表达重组铜绿假单胞菌外毒素A(rEPA)的工程菌发酵及表达产物纯化工艺。方法规模化发酵表达rEPA的重组大肠杆菌rPE553D,离心收集菌体,渗透压调解使菌体周质间隙蛋白释放后,高速离心收集蛋白溶液。经DEAESepharoseFF、PhenylSepharose6FF疏水层析和SOURCE30Q强离子交换层析,超滤浓缩纯化rEPA。用HPLC、SDS-PAGE和Westernblot等方法检定生化和免疫学特性,并用小鼠和Vero细胞检定毒性。结果每55L培养基中rEPA产量超过4g,纯度在95%以上,细胞毒性降低了至少32000倍。其余各项指标均符合《中国生物制品规程》要求。结论已建立了收率高、纯度好、稳定、适合规模化生产rEPA的工艺。     

INNOVATIVE APPLICATIONS OF IONIC LIQUIDS AS “GREEN” ENGINEERING LIQUIDS

Over the past decade, ionic liquids (ILs) have become one of the fastest growing “green” media for chemists and engineers due to their superb physicochemical properties. The applications of these remarkable salts in reactions and extraction processes have been extensively investigated and reviewed. This review, however, highlights recent advances of ILs as versatile “green” engineering liquids in a variety of industrial applications including heat transfer fluids, azeotrope-breaking liquids, lubricants, electrolytes, liquid crystals, supported IL membranes, plasticizers, and more. This review is not intended to be comprehensive, but rather to discuss the potentials of ILs for diverse industrial applications.     

1991—1992国外工程塑料进展

介绍了1991～1992年国外工程塑料研究和生产概况。论述了通用工程塑料、特种工程塑料和聚合物合金的研究开发、改性和应用方面的进展。且指出工程塑料发展趋势和特点;对复合材料技术进展作了较详尽的分析与阐述。