Radial Yarn Movement in Yarn Duct of Interlacer

In order to find the relations between the production performonce of interlacer and its cross-sectional Shapcs of yarn duct,radial yarnsd movement in varions yarn ducts of interlacer and its effect on performance of interlaced yarn were studied in this paper. Seven interlacers,which were diffcrent in the cross- sectional shape of yarn duct,were made. Yarn motion in yarn duct of interlace was observed with optical fibers and photo- sensors. Performance of the interlaced yarn was evaluated by the number and the strength of tangles. Experfmental results disclose the relations between the yarn motions and the properties of the interlaced yarn. The interlacer with round yarn duct is capable of producing an interlaced yarn with bigger number of tangles,since It can make yarn transverse frequently the axis of air jet issuing from air jet nozzle. The interlacer with cornered shape of yarn duct makes yarn subjected to the action of compressed air for a longer time,which results in larger strength of tangles.     

后奥运时代提升体育产业软实力的研究

后奥运时代是我国体育产业跨越式发展的良好契机,提升其软实力将是体育产业发展的关键所在.从体育软实力的基本概念出发,分析了我国产业中的软实力存在的现状和问题,并由此得出了体育提升软实力的途径:植入"文化"因素、完善体育赛事商业模式、扶植和培养体育明星和挖掘我国传统体育文化.     

多目标规划下伪不变凸函数的性质

从广义凸性的角度,首先引入了两种新的不变凸函数,考虑了向量关键点,并且在多目标规划下,证明了每个向量关键点均是有效解这一重要性质.     

信息化环境下高校《中国古代史》教学的思考

如何进行信息化环境下高校《中国古代史》教学,可以从两个方面进行思考：首先教师素质要提高,既要有传统功力,又必须与时俱进,兼备现代信息技术的熟练使用;其次,除了要提高自身素质外,教师在教学中亦须转变教学理念,要在教学中探索和实施研究性教学,这种研究性教学应从两方面变革和突破,即教师研究性教学和学生研究性学习。     

鸿都门学设立的原因及其文学思想史意义

汉末两次党锢之祸加剧了经学的式微,士人普遍表现出一种疏离政权的倾向,朝廷以经学取士的方式无法正常进行,灵帝在此际设立鸿都门学即是对选举制度所作的一次改革。当时社会围绕鸿都门学的争论映照出不同的文学观念:汉灵帝及鸿都诸生皆以书法辞赋作为利禄之途,是功利主义文学观;以杨赐、阳球为代表的正直士大夫主张罢除鸿都门学,对文学持否定的态度,是功利主义文学观的极端发展;蔡邕则从反对鸿都门学的角度认识到了文学的审美娱乐功能。三者皆反映出文学独立于经学的事实,因此鸿都门学的设立在文学思想发展过程中具有转折意义。     

低温氧漂活化剂的制备与应用

为解决纯棉针织物练漂温度高、能耗大等问题,制备了能用于低温漂白的锰配合物MnⅡ(L) (ClO4)2(其中L为1,4,7,10-四氮杂环十二烷),并研究了双氧水用量、配合物浓度、NaOH用量、练漂温度和练漂时间共5个工艺因素对漂白效果的影响.通过单因素试验和正交试验,得到优化的工艺条件:DM-1361用量为0.5 g/L,DM-1408用量为1 g/L,H2O2(35％)用量为8g/L,NaOH用量为6 g/L,配合物浓度为20 μmol/L,练漂温度为70℃,练漂时间为50 min,浴比为1∶10.结果表明:低温优化工艺整理后织物的白度和毛效略差于传统工艺,但达到服用要求；顶破强力与织物失重率均优于传统工艺.     

基于CCD图像处理方法自动定焦仪的研究

实验室测透镜焦距的传统方法是由测量人员在光具座上观测、记录、数据分析和计算结果,而用肉眼观察和判别往往容易产生差错。该文提出了一种基于CCD的数字图像处理方法自动测量透镜焦距的新设计——自动定焦仪,自动聚焦系统利用图像清晰度评价函数,由单片机控制马达转动镜头至对焦清楚的位置,实现数字化测量。     

面向对象的活塞CAD/CAM述评

介绍了活塞CAD/CAM技术及其发展现状。该技术主要包括在三维有限元的基础上 ,采用面向对象的技术和专家知识型的数据库建立活塞的实体模型 ,并在进行有限元的剖分和边界条件的确立后对分析结果优化设计 ,最后将设计好的实体通过在计算机自动生成NC程序。活塞CAD/CAM是一套在三维实体建模基础上的CAD/CAM一体化系统     

Influence of Spinning Technology on Dye Uptake of Modified Polypropylene Fiber

By adding small amount of olefin polymer additive, the dyeability of polypropylene fiber can be improved. Research results show that the improvement of dyeing performance of modified PP fiber is mainly due to the formation of looser structure of PP matrix and the micro-channels among additive particles in blended fiber. The dye uptake of drawn fibers decreases with drawing ratios obviously and changes with temperature of heat plate and heat roller a little.     

Wet Permeability and Moisture Vapor Transmission Characteristics of Soybean Knitted Fabrics

Wet permeability of fibrous assembly is mainly influenced by the properties of liquid and the configurations of the fiber which consist of diameter of fiber, twist angle and fiber alignment in a yarn. It can be seen from experimental results that the knitted fabric made of soybean (SB) fiber has good properties both in wet permeability and vapor transmission so that the knitting technology and fabric characteristics can be improved.