美国打造"全攻全守"太空战系统

美打造的地基激光系统、机载激光系统、太空拦截系统等太空战系统具备陆、空、太全程盯防对方导弹和全面威慑其他国家的能力。提起激光武器,多少让人觉得有些科幻色彩。但美国正一步步把激光武器变为现实,并准备应用到未来的太空战中。     

国产"太行"发动机性能优于苏-27

不论是军用还是民用飞机,发动机都是最关键的“心脏”部位。过去中国战机落后,首要因素是发动机制造水平低,最近一个局面已有改观。国产“太行”航空发动机的研制成功,称其具有“里程碑”意义。胡锦涛、温家宝及中央军委其他领导人都向参研单位和研发人员表示热烈祝贺,这在中国兵器发展史上是少见的。     

Healthy Functions and Mechanisms of Bamboo-Charcoal Modified Polyesters

In this paper, healthy fuactions and mechanismof bamboo-charcoal modified polyesters arc studied. Theresults show that there are five healthy functionsincorporated effectively in bamboo-charcoal modifiedpolyesters, such as good far-lnfrared radiation, good UVprotection, certain negative ion emission, certain anti-bacteria and good absorption functions. The metal elementsand carburets are mainly responsible for far-infrared,negative ion emission functions. UV prevention functionresults mainly from the carbon elements. The absorbabilityand bacteriostasis functions lie in the porous structures.     

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.     

Study on Wet Permeability Models of Yarns and Knitted Fabrics

Water transport through the pore structure of the knitted fabric can occur only in place where the fiber-water surface attraction force is greater than the water weight in the capillary. To investigate wet permeability of the knitted yarn in the fabric, a liquid transport model is established. The main factors which have significant influences on the liquid transport have been analyzed. It is derived from the argument that the optimal design for the knitted fabric with quick sweat transport property can be obtained.     

Differential Capillary Effect Model of Fabric and Its Application

The concept of the differential capillary effect was presented by foreign scholars several years ago, and the principle was used to design sportswear fabrics with good wet permeability and good drying functions for famous sports teams. Because the differential capillary effect model was not established in theory, it was impossible to fulfill the best functions. In this paper, by setting up the differential capillary effect of fabric, the factors to influence wet permeability and drying functions of the model is discussed in theory, and the means to optimize the design of the fabric is presented and proven practically by the experiment. The optimum fabric with good permeability and good drying functions can be designed using the model at last.     

对我国城市儿童户外活动空间配置研究的思考

通过统计分析1989-2018年间国内城市儿童户外活动空间配置标准、配置评价及配置优化等相关研究,探讨城市儿童户外活动空间配置领域的研究现状,发现我国现阶段相关领域缺乏对城市儿童户外活动空间配置的规范引领,缺乏空间配置影响因素的研究,空间配置研究方法有待优化,空间设计缺少与宏观规划的结合考虑等问题,为保障我国城市儿童户外活动空间的合理配置,满足儿童对开放空间的需求,提出相关建议,为未来展开深入的研究提供参考.     

金属丝网减振器的建模与参数识别研究

针对金属丝网减振器的滞迟特性和非线性关系,利用金属丝网减振器的静态特性试验得到载荷-位移曲线,并由此建立了金属丝网减振器的滞迟恢复力模型,将恢复力gn分解为无记忆部分g0和记忆部分z(t),并分别用间接Fourier展开法和直接Chebyshev展开法对减振器双折线本构关系进行级数展开和参数辨识,通过参数识别数值模拟得出Chebyshev级数展开识别法的精度略胜一筹,为建立金属丝网减振器非线性泛函本构关系与动力学模型提供了坚实的实验基础和理论指导。     

光电材料的合成方法与功能

 中国科协第378次青年科学家论坛--光电材料的合成方法与功能于2019年9月7日在吉林省长春市举办。此次论坛由吉林省科学技术协会承办。本刊摘录部分学者的主要观点，以飨读者。     

浅析医疗纠纷产生的原因及防范

近年来医疗纠纷呈日益递增趋势,随着医学知识的普及和人们法制观念的增强,医患之间的矛盾不断激化,引起了社会的广泛关注。医疗纠纷对于医患双方均造成较大危害,已成为整个社会亟待解决的问题。为了加强医患之间的沟通,有效地防止医疗纠纷的发生,笔者主要分析医疗纠纷的现状及其产生的原因,并针对其原因进行理论探讨,进一步提出预防医疗纠纷的对策建议。