青年群体社会责任感影响因素的实证研究

本文旨在以60后、70后、80后青年群体作为研究对象,采用广义矩估计GMM模型的研究方法,对影响中国青年社会责任感的各方面因素进行剖析。研究结果显示,国家教育环境、青年受教育程度、青年就业状况与青年社会责任感之间存在正相关关系,而精神信仰缺失度与其存在负相关关系,但影响因素在不同时期的显著性水平存在差异。     

电枢磁动势谐波对转子涡流损耗的影响分析

永磁电机多采用变频器供电,变频器输出的电流中除包含基波电流外还存在谐波电流,由其产生的电枢磁动势空间谐波会在转子中产生涡流损耗。基于对各次电枢磁动势空间谐波幅值及其相对于转子交变频率的详细分析,提出涡流损耗强度的概念,用于评估不同的电枢磁动势空间谐波对转子涡流损耗的影响程度。对采用整数槽和分数槽绕组的永磁电机转子涡流损耗做了解析对比和有限元分析,证明了利用涡流损耗强度评估电枢磁动势谐波对转子涡流损耗影响的有效性。     

多点成形数值模拟中的基本体成形曲面造型方法

基本体群成形面曲面造型是多点成形数值模拟中的关键问题之一。本文给出了基本体群成形面造型方法，并开发了相关程序。在此基础上，对多点成形中球面件的起皱缺陷及马鞍面的成形力进行了数值分析。     

Cutting forces modeling considering the effect of tool thermal property—application to CBN hard turning

Force modeling in metal cutting is important for a multitude of purposes, including thermal analysis, tool life estimation, chatter prediction, and tool condition monitoring. Numerous approaches have been proposed to model metal cutting forces with various degrees of success. In addition to the effect of workpiece materials, cutting parameters, and process configurations, cutting tool thermal properties can also contribute to the level of cutting forces. For example, a difference has been observed for cutting forces between the use of high and low CBN content tools under identical cutting conditions. Unfortunately, among documented approaches, the effect of tool thermal property on cutting forces has not been addressed systemically and analytically. To model the effect of tool thermal property on cutting forces, this study modifies Oxley’s predictive machining theory by analytically modeling the thermal behaviors of the primary and the secondary heat sources. Furthermore, to generalize the modeling approach, a modified Johnson–Cook equation is applied in the modified Oxley’s approach to represent the workpiece material property as a function of strain, strain rate, and temperature. The model prediction is compared to the published experimental process data of hard turning AISI H13 steel (52 HRc) using either low CBN content or high CBN content tools. The proposed model and finite element method (FEM) both predict lower thrust and tangential cutting forces and higher tool–chip interface temperature when the lower CBN content tool is used, but the model predicts a temperature higher than that of the FEM.     

液磁增力离心式离合器

介绍了采用液压及电磁增力的离心式离合器，说明了其工作原理，给出输出力和输出转矩、接合角速度和接合转速。额定角速度和额定转速、弹簧最大工作载荷的计算公式。其结构紧凑，输出转矩的能力提高非常显著，将离合器设计作为设备电控系统子系统综合考虑是研制发展的方向。     

薄壁钢管切割夹具设计

针对薄壁钢管加工过程中存在的装夹效率低、加工精度差等问题,设计一种从钢管内部夹紧、加工范围大、一次装夹可实现多次多段切割的新型夹具,分析夹具整体结构特点和受力情况,对于提高钢管切割效率、保证切割精度、优化工艺过程起到了积极作用。     

关于硬质合金中铁对矫顽磁力影响的研究

本文应用数理统计的方法，揭示硬质合金中铁对矫顽磁力的内在联系，采用现代磁性理论对其机理进行探讨，进而利用两者关系，修正矫顽磁力值，使之标准化，达到正确使用矫顽磁力控制合金组织结构的目的．     

Increasing Efficiency of Force-Controlled Robotic Assembly: -Design of Damping Control Parameters Considering Cycle Time-

Parameter tuning of force control to achieve operations efficiently in robotic assembly is essential but time-consuming. In this paper, an optimal set of parameters for damping control is computed, which can reduce the cycle time of an assembly operation. The proposed method is formulated as a nonlinear optimization using a dynamic simulator based on 3D geometric model of assembled parts. The method is applied to clutch assembly for practical use. The results verify how the operations can be sped up using the obtained parameters. The proposed method enables users to introduce force control agilely.     

船用力反馈两级电液比例阀的设计研究

根据船舶操舵仪及舵机系统的工作要求，分析其液压控制元件的应用情况，研究设计力反馈两级电液比例阀。     

Abdominal sensory equipment involved in external host discrimination in a solitary parasitoid wasp

Already parasitized hosts are often of poorer quality than healthy hosts. It is therefore usually advantageous for parasitoid females to recognize and reject them. Parasitized hosts can be identified on the basis of various physical or chemical marks present on the surface or inside the hosts or their surroundings in the case of concealed host. Here we studied host discrimination behaviors of females of a certain population of Pachycrepoideus vindemmiae, a solitary ectoparasitoid, which are known to reject large-sized parasitized hosts after an abdominal examination of their surface. We first investigated females' recognition behaviors of host parasitism status when confronted to small-sized hosts (Drosophila melanogaster pupae) as host size may influence the use of different cues for host selection. We showed that, in such a situation, females also discriminate parasitized hosts after an external host exploration with the tip of their ovipositor sheath (third valvulae). We then described the sense organs present on the different parts of the ovipositor by means of scanning and transmission electron microscopy analysis. As the extremity of the third valvulae bears only one type of sensilla that appears to be chemoreceptors, we considered these sensilla as highly likely to be involved in host discrimination in P. vindemmiae. To our knowledge, this is the first time that receptors located on the ovipositor sheath are described as implicated in host discrimination in parasitoid wasps. We discuss potential chemical markers that might be detected by these receptors.