强捻纱线织物的服用性能测试分析

采用强捻纱线以平纹组织和斜纹组织进行小样试织,与一般棉织物透气性和耐磨性作对比测试分析。结果表明,强捻纱线织物的透气性和耐磨性都优于普通棉织物;纱线线密度和捻度,织物组织及经纬密度直接影响织物的透气性和耐磨性。     

大扭曲度整体涡轮叶片展成电解加工成形规律及试验研究

根据大扭曲度整体涡轮结构特点与加工难点，提出用展成电解方式实现其叶片加工；分析、研究大扭曲度整体涡轮展成电解加工叶片型面成形规律；根据其成形特点，进行多轴联动数控编程的优化；合理设计阴极及流场，对叶背二次腐蚀、出口短路及叶背余量去除等关键工艺问题进行分析讨论并提出有效解决措施；进行整体涡轮叶片展成电解加工试验，可稳定达到型面精度加工要求，为大扭曲度整体涡轮展成电解加工的应用创造了条件。     

Tribochemical behaviour of the selected mesogenic additive in n-hexadecane

Summary Tribochemical behaviour of the selected mesogenic compound (4-butylcyclohexanoic acid p-hexaoxyphenyl ester) was investigated by means of ball-on-disk machine at ambient and elevated temperatures. To selection of the thermal conditions of tribological tests DSC technique was used and to analyse tribochemical products layered on the wear tracks—SEM/EDS, FTIRM and XPS ones. Obtained results show that the mesogen dissolved in n-hexadecane is an effective antiwear additive which decreases temperature of the lubricant. This is favoured mainly by tribochemical processes.     

Visual Appearance of Chiral Nematic Cellulose‐Based Photonic Films: Angular and Polarization Independent Color Response with a Twist

Hydroxypropyl cellulose (HPC) is a biocompatible cellulose derivative capable of self‐assembling into a lyotropic chiral nematic phase in aqueous solution. This liquid crystalline phase reflects right‐handed circular polarized light of a specific color as a function of the HPC weight fraction. Here, it is demonstrated that, by introducing a crosslinking agent, it is possible to drastically alter the visual appearance of the HPC mesophase in terms of the reflected color, the scattering distribution, and the polarization response, resulting in an exceptional matte appearance in solid‐state films. By exploiting the interplay between order and disorder, a robust and simple methodology toward the preparation of polarization and angular independent color is developed, which constitutes an important step toward the development of real‐world photonic colorants.     

Cephalopod-Inspired Stretchable Self-Morphing Skin Via Embedded Printing and Twisted Spiral Artificial Muscles

Cutaneous muscles drive the texture-modulation behavior of cephalopods by protruding several millimeters out of the skin. Inspired by cephalopods, a self-morphing, stretchable smart skin containing embedded-printed electrodes and actuated by Twisted Spiral Artificial Muscles (TSAMs) is proposed. Electrothermally actuated TSAMs are manufactured from inexpensive polymer fibers to mimic the papillae muscles of cephalopods. These spirals can produce strains of nearly 2000% using a voltage of only 0.02 V mm⁻¹. Stretchable and low-resistance liquid metal electrodes are embedded-printed inside the self-morphing skin to facilitate the electrothermal actuation of TSAMs. Theoretical and numerical models are proposed to describe the embedded printing of low-viscosity Newtonian liquid metals as conductive electrodes in a soft elastomeric substrate. Experimental mechanical tests are performed to demonstrate the robustness and electrical stability of the electrodes. Two smart skin prototypes are fabricated to highlight the capabilities of the proposed self-morphing system, including a texture-modulating wearable soft glove and a waterproof skin that emulates the texture-modulation behavior of octopi underwater. The proposed self-morphing stretchable smart skin can find use in a wide range of applications, such as refreshable Braille displays, haptic feedback devices, turbulence tripping, and antifouling devices for underwater vehicles.     

扭曲扁管管内流动与传热的三维数值研究

利用计算流体力学和数值传热学的方法,对扭曲扁管三维模型的流动与传热性能进行了数值模拟计算和理论分析,研究了管内流体的Re,Pr以及管子几何尺寸对其流动与传热性能的影响,结果表明,扭曲扁管具有较好的强化传热效果,在管内流体具有高Pr低Re数的条件下,其强化传热效果尤为明显。根据数值计算的结果数据,拟合出了努塞德数和阻力系数的准则公式,对扭曲扁管工程实际应用具有一定的参考价值。     

高速LVDS收发器的设计及硬件实现

该文实现了一种基于5类双绞线高速传输低电压差分信号的设计方案.LVDS采用差分传输和低电压摆幅技术,能够在实现很高的传输速率的同时消耗较低的功率.驱动器芯片clc001和自适应均衡器芯片clc012可以对百米双绞线上传输的LVDS信号做驱动和均衡,提高信号完整性,从而完成LVDS发送器和接收器的设计和硬件实现.     

加筋格宾挡墙地震反应与动土压力分析

本文通过大型的模型试验,研究了以红砂岩为填料在水平地震作用下加筋格宾挡土墙的地震反应。输入不同类型和幅值的地震波激励,探讨地震作用下模型挡墙的动力特性与动力响应规律。试验结果表明,加筋格宾结构为优良的抗震结构,其墙内对输入加速度有明显的放大效应。沿墙高方向水平加速度放大倍数的增量坡度比较平缓,随着墙高的增大,水平加速度有增大的趋势。墙内各质点对ELCE＿NS地震波的水平加速度放大倍数为1～1.88倍,对HACHI＿EW地震波的放大倍数为1～2.78倍。墙面板的水平加速度放大倍数随振幅增大呈现明显的递减趋势,变化基本上为线性的。竖向加速度峰值响应在墙面及墙顶显著增大,可达到台面水平加速度峰值的44%~56%。推导了加筋格宾挡墙在水平地震荷载作用下的竖向动土压力的振动方程。     

Weyl代数上模的几点注记

主要给出了n阶Weyl代数An上有限生成torsion模和维数之间等价关系.证明了An上有限生成模M是torsion模,当且仅当其维数d(M)≤2n-1;其次,给出了局部化模k[X,P-1]的一类twisted模的同构分类.     

冷轧扭钢筋粘结锚固性能的试验研究

冷轧扭钢筋的拉拔试验及构件试验结果表明，该种钢筋具有较好的锚固延性，即在很大的变形滑移下仍可保持相当的锚固强度。试验也为有关规程的修订提供了依据。