液压支架底座的有限元分析

利用Pro/E软件对液压支架底座进行三维建模,用ANSYS软件对液压支架底座在各种工况下的受力情况进行有限元分析和研究,从而为设计高质量液压支架提供一定的理论依据。     

单纵模激光器中三台阶快脉冲技术的研究

详细介绍了高压电平及台阶宽度可调的三台阶快脉冲产生的技术方案,实现了快脉冲的台阶电平200~700 V范围内可调,台阶宽度100μs范围内可调。实验结果表明该技术方案能输出满意的脉冲波形。以此台阶脉冲信号为单纵模激光器提供驱动,调节三台阶快脉冲的幅度和持续时间,单纵模激光器可以获得平滑稳定、低抖动的输出波形。该技术可应用于高功率固体激光驱动器以及其他需要多台阶高压可调快脉冲发生器的设计中。     

掺杂离子在LHPG单晶光纤中的分布

用电子能量色散谱（ＥＤＳ）分析了Ｎｄ＾３＾＋，Ｅｒ＾３＾＋和Ｃｒ＾３＾＋等掺杂离子在ＹＡＧ单晶光纤中的分布，实验发现：掺杂离子的分凝系数不同，其分布规律也不同，根据晶体的溶液生长理论，导出了掺杂离子分布方程，它与实验结果相符较好。     

Nb2O5-Based Oxide Ceramics and Single Crystals-Investigation of Dielectric Properties

The behavior of enhancements of dielectric constant of Nb₂O₅ through small substituents of TiO₂ is of interest. The ceramics of these solid solutions were prepared by the conventional mixed oxide method. Single crystal fibers were grown by the Lase r-Heated Pedestal Growth (LHPG) technique, which is considered to be a powerful tool for rapid growth of high-melting temperature oxides and incongruent melting compositions. The dielectric properties as function of temperature (-180°C to 180°C) and frequency (1 KHz to 1 MHz) were measured. The direct-current (dc) electric field dependence of the dielectric constant has been studied. The results show the strong dielectric dispersion which exists in a large frequency range which implies that the relaxation process involved is not of a Debye type. A relaxation distribution can be therefore expected. The influence of the cluster size dispersion is one assumption. Thus, the data of dc bias field dependence of the dielectric constant has been analyzed by the modified Devonshire relation including a cluster term giving the fitted parameters: cluster sizes distribution and their polar cluster polarization.

^aOn leave from the Petroleum and Petrochemical College, Chulalongkorn University, Thailand.     

MCGS和PLC在医用废料自动处理系统中的应用

针对高温高压粉碎销毁医用废料的医用标准，具体分析了医用废料的自动处理的整个过程，利用组态软件MCGS和可编程控制器PLC，对医用废料自动处理系统进行了研究和设计，并在实际中实现了该系统。     

小型车载卫通天线座的结构设计

根据车载卫通天线座的主要技术指标,以小型化和模块化设计为指导思想,选取新型传动型式——钢丝绳摩擦传动,并选择碟型弹簧作为传动系统的张紧装置。设计了一种小型转台式天线座,该天线座体积小,重量轻,满足了系统可靠性和机动性要求。     

Growth and dielectric properties of Ta_2O_5 single crystals grown by laser heated pedestal growth technique

Ta2O5 single crystals have been grown by the laser heated pedestal growth (LHPG) technique up to several centimeters length with diameter of 1.1 mm. The crystal, characterized by X-ray diffraction, dielectric measurement, and thermal expansion analysis, has Htri-Ta2O5 symmetry. Dielectric permittivity, loss tangent along [001] and [110] direction were investigated over the temperature range from -80 ℃ to 100 ℃. Large dielectric anisotropy in Ta2O5 single crystal was observed. At room temperature, the dielectric permittivities (1 MHz) along [001] and [110] are 33.2 and 231.9, respectively. The reason of dielectric enhancement in Ta2O5 crystal grown by LHPG was also discussed.     

雷达天线座水平误差的一种测量方法

对雷达设备安装过程中,天线座水平精度的保证及其测量方法加以讨论。从雷达天线座水平误差的计算分析、水平误差的测量和调整方法以及具体的实例来说明雷达天线座水平精度的保证方法和测量、调整、再测量的天线座水平误差的标定过程。     

复杂支座挤压成形工艺研究

建立了支座零件成形工艺的刚粘塑性有限元模型，采用三维有限元法对支座成形的两种工艺进行了模拟分析，确定了合理的成形工艺。基于模拟分析的结果，设计出结构合理的成形模具。     

色散渐减光纤环形腔镜非等比耦合传输特性研究

利用光纤环形镜对脉冲进行压缩有着消除脉冲基座的优势而被广泛采用。传统的色散递减光纤构成的环形腔构成都采用50∶50的耦合器,本文通过对不同脉冲宽度及不同类型色散递减光纤构成的环形腔镜研究,分析发现采用60∶40的非等比耦合器较50∶50的耦合器构成的环形腔镜能够获得更高压缩质量的输出脉冲。