旋转翼—身—尾组合体非对称涡效应的数值模拟与计算

研究了旋转弹在超音速大攻角下，非对称涡的产生、发展以及气动力和力矩的数值模拟算法。以Ｆ．Ａ．Ｗｏｏｄｗａｒｄ等人的有限基本解方法为基础，计及了旋转对弹体脱落涡、弹翼前缘涡、侧缘涡和后缘涡等诸涡系生成、发展的影响。计算结果表明，所提出的方法反应了旋转飞行器超音速、大攻角的气动特性。     

大麻纤维的可纺性能及其研究进展

介绍了大麻纤维的化学组成及大麻纤维的结构、性能，分析了大麻纺纱各种方法的利弊，提出了提高大麻纤维可纺性、改善纱线质量的方法。     

Influence of Dispersion of Nano-ZnO Particles in Polymer Matrices on Properties of Relevant Nano Composite Fibers

IntroductionIt is well knownthat nanoparticles have rich propertiesand are useful for functional composites . The nanometricsize ,leading to huge specific surface area up to or morethan1 000m2/g ,andtheir unique properties have attractedintensive interests . Thus many articles have elucidated thepreparation of polymer matrix nanocomposites( PMNC)[1 6]. Polymers are very i mportant matricesbecause of their flexibility and easy processing .Nanoparticles i mpart larger-size congeries because of…     

新型药物释放材料褐藻酸盐纤维的制备研究

利用湿法纺丝钙离子交联的方法制备褐藻酸盐纤维,并将牛血清清蛋白包埋入纤维中,研究了制备条件对纤维性能的影响.用扫描电镜观察纤维的微观形貌;并测试了纤维的力学性能、溶胀性能;测定了蛋白质的包埋效率,以及蛋白质的释放速率.结果表明,湿法纺丝凝固浴的CaCl2浓度影响纤维的力学性能、溶胀性能及蛋白质的释放.     

超精密大理石车床主轴回转精度动态测试的误差分析

分析了影响超精密大理石车床主轴回转精度测试结果的误差因素，提出了相应的抑制方法．实验结果表明误差抑制效果及测试精度良好．     

武汉市星级饭店布局的影响因素分析

以武汉市的110家星级饭店为研究对象,运用GIS空间分析工具,分析和探讨了其规模结构、空间布局特征和规律.结果表明武汉市星级饭店在等级规模上表现为纺锤形结构,在空间分布上呈现出核心—边缘结构.具体为向主干道和商贸发达地区集聚.得出了武汉市星级饭店空间布局影响因素为人口密度、交通区位条件、商贸发达程度和旅游景点的分布.     

数控车床主轴组件的新工艺

介绍了数控车床主轴组件采用过盈连接的新结构,取代了键连接、锁紧螺母固定的传统结构,并介绍了过盈配合的选择与计算、主轴组件的热套装配工艺及过盈配合的油压拆卸工艺.     

可溶PVA伴纺高支纯棉色织面料的生产工艺路线

对用可溶性维纶(PVA)伴纺生产高支高密纯棉色织面料的两种工艺路线("纱线染色、织造、退维"和"纱线退维、染色、织造")进行分析和试验研究.研究结果表明:采用"先退维、后染织"的工艺路线,退维股线的强力较低,可织性差,进行产业化生产的难度较大;采用"先染织、后退维"的工艺路线,织造效率和布面质量能得到保证,可应用于产业化生产;色织布退维后,织物的白度降低,颜色变浅,但无明显沾色现象.     

Additional Twists of Yarn Produced by System of Compact Spinning with Lattice Apron

Based on the flow simulation in the condensing zone of compact spinning with lattice apron and a bead-elastic rod dynamic model of the flexible fiber,trajectories of fibers with different negative pres...     

STUDY ON MECHANISM OF FIBRE DEPOSITION IN OE FRICTION SPINNING

This paper deals with the mechanism of fibre deposition in OE friction spinning.A fibremodel has been established to analize and evaluate fibre.straightness after deposition.Exper-iments have been done on the measurement of air flow speed at the entrance and exit of thefeed duct which is mounted in an experimental friction spinning unit.Conclusion has beendrawn:the weakness of friction spun yarn is mainly due to its poor fibre straigthness after dep-osition.