Digital Design and Manufacture of Spatial Cams

1 Introduction Since spatial cam mechanisms have excellent kinematic and dynamic characteristics ,they are widely usedinmany types of automatic machines such as automatic assembly machinery, machine tools ,printing presses ,in-ternal combustionengines andtextile machines[1].The excellent dynamic and dynamic characteristics of the spa-tial cam mechanisms are ensured by the precise contour surfaces ,therefore the elements of spatial cam mecha-nisms must have higher machining accuracy.As a practi…     

间歇分度凸轮机构传动装置CAD应用软件的研究与开发

在对间歇分度凸轮机构现有运动学分析的基础上，建立了比较完善的间歇凸轮传动装置ＣＡＤ应用软件系统；给出了该软件的主要内容及设计方法；采用了软件结构化设计的ＳＤ方法和ｊａｃｋｓｏｎ方法，大大提高了ＣＡＤ应用软件的结构质量，给软件的维护和使用带来很大方便。     

固体酸催化剂WO3/TiO2催化合成丁酸异戊酯

本制备WO3为活性组分,TiO2为载体的双金属匿体酸酯化催化剂WO3/TiO2,采用IR测试技术对催化剂进行了表征.将该催化剂用于正丁酸与异戊醇进行酯化反应合成了丁酸异戊酯.考察了催化剂用量、n(异戊醇):n(正丁酸)、反应时间、带水剂种类和催化剂重复使用性等因素对醋化率的影响.实验结果表明.该催化剂催化合成丁酸异戊醣...     

高分子敏感材料及其应用

叙述了高分子敏感材料的物理、化学特征及制造方法,阐述了在各个领域的应用情况。     

粘接-电刷镀复合技术在镗床导轨修复中的应用

叙述了T6112卧式镗床粘接-电刷镀复合技术方案的确定、修复工艺及使用效果。     

Monte Carlo simulation of nano-particle sintering

This paper uses a multi-state Potts model to simulate the sintering of nano-particles by boundary migration and evaporation-condensation. The variables in this simulation are the reduced temperature, a next-nearest neighbour weighting and the ratio of interfacial to surface energy. The effect of these parameters on simulation of sintering of two and three-particle clusters is systematically explored as a basis for the study of more complex aggregates.     

Syntax-Based Aspect Sentiment Quad Prediction by Dual Modules Neural Network for Chinese Comments

Aspect-Based Sentiment Analysis (ABSA) is one of the essential research in the field of Natural Language Processing (NLP), of which Aspect Sentiment Quad Prediction (ASQP) is a novel and complete subtask. ASQP aims to accurately recognize the sentiment quad in the target sentence, which includes the aspect term, the aspect category, the corresponding opinion term, and the sentiment polarity of opinion. Nevertheless, existing approaches lack knowledge of the sentence’s syntax, so despite recent innovations in ASQP, it is poor for complex cyber comment processing. Also, most research has focused on processing English text, and ASQP for Chinese text is almost non-existent. Chinese usage is more casual than English, and individual characters contain more information. We propose a novel syntactically enhanced neural network framework inspired by syntax knowledge enhancement strategies in other NLP studies. In this framework, part of speech (POS) and dependency trees are input to the model as auxiliary information to strengthen its cognition of Chinese text structure. Besides, we design a relation extraction module, which provides a bridge for the overall extraction of the framework. A comparison of the designed experiments reveals that our proposed strategy outperforms the previous studies on the key metric F1. Further experiments demonstrate that the auxiliary information added to the framework improves the final performance in different ways.     

极高支承应力煤巷锚索桁架控制机理与实践

针对某矿在褶曲断层区的孤岛煤柱中开掘巷道时遇到支承应力大、煤岩体破碎、巷道断面大等技术难题,基于预应力锚索桁架支护系统可以改变巷道围岩受力状态的特征,结合该矿现场条件,设计并优化了联合控制方案中的锚索桁架支护参数。现场实施结果表明,以锚索桁架为主的联合控制技术能够解决极高应力作用下大断面煤巷支护难题。     

催化氧化环己酮合成己二酸研究进展

综述了近年来国内外以环己酮为底物,分别采用空气、氧气和双氧水为绿色氧化剂,催化氧化合成己二酸的研究进展。     

雷电监测系统探测性能动态试验方法研究

雷电监测系统可以实时监测雷电区域并给出雷电定位信息。文章介绍了雷电监测系统技术的发展状况,主要对系统雷电定位技术进行了阐述和分析,并对雷电监测系统的探测性能动态试验方法进行了探讨研究。