圆柱壳体振动陀螺谐振子的品质因数研究

品质因数是衡量陀螺振动特性的重要指标,它决定了陀螺的检测灵敏度.首先从理论上分析了影响圆柱壳体振动陀螺谐振子品质因数的主要因素.然后针对各种因素进行一系列的实验研究,包括谐振子的材料、形状以及尺寸等因素对于陀螺谐振子品质因数的影响.研究结果表明,谐振子的品质因数在很大程度上决定于谐振子材料、谐振环的形状及外径尺寸.材料...     

New Algorithm for FMS Scheduling Based on Multiagent System Architecture

Redefined benefit-driven function is used to study the dynamic scheduling of FMS based on multiagent architecture. Each agent is dedicated to a work center, i.e. a set of the manufacturing system. In one hand, each agent selects locally and dynamically the dispatching rule(DR) that seems to be most suited to the operating conditions, production objectives and current shop status. On the other hand, each task should bring certain amount of benefit for the manufacturer. So, it is reasonable to have the dynamic scheduling of FMS relying upon multiagent architecture using the benefit-driven function as a strategy. Well, today's manufacturing corporation, especially the high & new technology one and deep machining one, the cost of their products is mainly determined by how much the knowledge is input From this viewpoint, we redefined the benefit-driven function, hi the end, this approach is compared with other existing DRs on a job-shop problem, already used in other research works.     

基于计算机优化的锻造工艺节材节能技术研究

分析了传统锻造工艺，指出了传统锻造工艺金属材料利用率和加热的能源利用率低的根源，提出了基于计算机优化的锻造工艺节材节能的设计方法和技术，并运用该技术进行了锻造工艺改造，节约金属原材料和能源1／4左右。     

Sol-gel synthesis and photoluminescence of LaPO_4:Eu~(3+) nanorods

Monoclinic LaPO4 nanostructures with uniform rod shape have been successfully synthesized by a simple sol-gel method.The procedure involves formation of homogeneous,transparent,metal-citrate-EDTA gel precursors,followed by calcination to promote thermal decomposition of the gel precursors to yield the LaPO4 nanoparticles.Their morphologies and structures were characterized by XRD,TEM,TG-DSC and HRTEM.The results indicate that single monoclinic phase LaPO4 nanorods are readily obtained at 800 ℃ within 3 h.Furthermore,photoluminescence(PL) characterization of the Eu3+-doped LaPO4 nanocrystals was carried out.The effects of calcination temperatures and Eu3+ doping content on the PL properties were elaborated in detail.Room-temperature photoluminescence(PL) characterization reveals that the optical brightness as well as the intensity ratio of 5D0-7F1 to 5D0-7F2 is highly dependent on the calcination temperature,and the Eu0.05La0.95PO4 nanophosphor shows the relatively promising PL performance with the most intense emission.     

Cross-sectional distortion behaviors of thin-walled rectangular tube in rotary-draw bending process

The cross-sectional distortion usually appears during rotary-draw bending process of thin-walled rectangular tube with small bending radius.To study the cross-sectional distortion of the tube,a three-dimensional finite-element model of the process was developed based on ABAQUS/Explicit code and its reliability was validated by experiment.Then,the cross-sectional distortion behaviors of the tube were investigated.The results show that a zone of larger circumferential stress appears on the tube when bending angle reaches 30°.And in the larger circumferential stress zone,the sagging phenomenon is produced obviously.The maximum cross-sectional distortion is located in the larger circumferential stress zone and the angle between the plane of maximum cross-sectional distortion and the bending reference plane is about 50°.The position of the maximum cross-sectional distortion keeps almost unchanged with the variation of the clearances between dies and tube.     

Application of ionic liquids in hydrometallurgy of nonferrous metals

Ionic liquids as green solvents have shown important application in the extraction and separation of nonferrous metals.The new application perspective,the important fundamental and the applied studies of the extraction and separation of nonferrous metals in ionic liquids,including the dissolution and corrosion of metal and metal oxide,hydrometallurgy of chalcopyrite and metallic oxidized ore,and extraction and separation of metal ions,are introduced.     

采用薄型气环提高内燃机机械效率

本文提出采用降低气环高度以提高内燃机机械效率的方法,并进行了理论分析,及引用有关试验结果证明之,对内燃机节能降耗研究有一定参考意义。     

马氏体相变的弹性波促发形核

使用Gleeble-1500型热模拟机，对30CrMnSiMoV超高强度钢在奥氏体状态下预应变。而后分三种工艺淬火：预应变结束后不卸载立即喷雾冷却；预应变结束后卸载，并于960℃保温5min后再喷雾冷却；预应变后不卸载，重新加热至1050℃，并保温5min，发生再结晶后再喷雾冷却。经对其马氏体组织进行分析发现：处于释放状态的弹性应变能会促发马氏体相变均匀形核；而塑性应变对马氏体的生长有限制作用，可间接影响马氏体的相变形核。两者的恰当配合，可显著细化马氏体，使其板条平均宽度接近纳米量级水平（平均宽度为120nm）。在此基础上，提出了一种马氏体的软模弹性波动形核机制。可解释所获得的实验结果。     

氯化锂在甲醇-水溶剂中的稀释热测定及关联

使用 L KB2 1 0 7型微量热计 -微机数据采集系统测量了 2 88.1 5K、2 98.1 5K、30 8.1 5K下 Li Cl- CH3OH-H2 O体系在不同混合溶剂浓度下的稀释热。测量结果用扩展的 Debye- Hückl方程、Pitzer模型和单参数模型关联。计算了方程中的参数和溶液无限稀释热 -ΔH∞D( m Li Cl=1 mol/ kg)。结果表明 :相同混合溶剂浓度下 ,-Δ H∞D 随温度增加而增加 ;同一温度下 ,- ΔH∞D 随溶剂浓度 x2 ′的增大而增大。