机械合金化金属间化合物Ni3Al研究现状

本文综述了用机械合金化法制备金属间化合物Ni3AI的研究现状和发展情况。介绍了Ni3AI的机械合金化过程和影响因素，以及Ni3AI机械合金化后粉体的成形烧结工艺及性能。展望了金属间化合物Ni3Al机械合金化的发展前景。     

用刚塑性有限元法求解二辊轧管时轧制压力

根据二辊斜轧穿孔变形的特点,对变形区进行了适当的简化,并建立了几何模型,在应用刚塑性有限元法对其稳态轧制变形区的力学特性进行分析基础上,建立了斜轧穿孔过程的泛函、初始速度场,处理了边界条件,求解了轧制压力,并且得到了较高的精度。     

宝钛股份2005年生产经营状况及2006年目标

通过对宝钛股份两年来主要经济利润指标的比较、对公司在完成生产经营目标中所采取的策略与措施及近期公司技改方面的情况介绍，说明宝钛股份2005年的生产经营状况及2006年规划。     

基于冗余容错技术的高炉鼓风机自动化特护系统

通过采用冗余容错、冷风保安拨风子系统、风机特殊仪表自适应性、动态实时监控和跟踪等技术对运行的风机机组自控系统进行优化改造,建立了高炉鼓风机自动化特护系统,提高了整个自控系统的稳定性和可靠性。     

Design and testing of micro fluidic chemical analysis chip integrated with micro valveless pump

Micro fluidic analysis technology has been developed rapidly since the 1990s. The essentials of the technology are fabricating the micron structure (usually net channels, 20―100 μm wide and 10―30 μm deep) in chips by micro processing, and analyzing the fluids of samples or reagents chemically when they are controlled to flow and to be mixed in the micro structures. The occurrence of the technology makes the miniaturiza-tion, integration and portability of chemical detecting devices possibl…     

唐宋陶瓷与时代风尚

唐宋是中国封建社会文明高度繁荣时期.这一时期的中国古代陶瓷在技术上日渐成熟.唐宋陶瓷成为我们了解唐宋社会面貌的一个窗口.从四个方面探讨唐宋陶瓷与唐宋时期社会生活、时代风尚之间的关系.     

Analysis and evaluation of effects of processing steps on dimensional tolerance of PIM parts

The factors affecting the dimensional tolerance of powder injection molding (PIM), such as the selection of the powder and binder, the feedstock homogeneity, the feedstock thermal properties, the feedstock rheologic behavior, the debinding schedule and atmosphere and sintering temperature gradient were discussed. An attempt was made to develop a model to estimate the influence of important variables. The results show that a better understanding of these factors can provide some useful theoretical instructions for large scale production.     

Simulation Research of Magnetic Constriction Effect and Controlling by Axial Magnetic Field of Vacuum Arc

Based on magnetohydrodynamic (MHD) model of vacuum arc, the computer simulation of vacuum arc was carried out in this paper. In the MHD model, mass conservation equation, momentum conservation equations, energy conservation equations, generalized ohm‘s law and Maxwell equation were considered. MHD equations were calculated by numerical method, and the distribution of vacuum arc plasma parameters and current density were obtained. Simulation results showed that the magnetic constriction effect of vacuum arc is primarily caused by the Hall effect. In addition, the inhibition of axial magnetic field (AMF) on constriction of vacuum arc was calculated and analyzed.     

热电模块应用的几个相关问题分析

提出了一种解决热电模块参数的方法.给出了可获得较大制冷系数的条件.热电器件冷却采用最小电流控制技术可获得较高的制冷效率,该技术已成功地应用在某热电控制的微通道换热系统中.     

同步发电机励磁系统中PWM控制的仿真研究

优良的励磁控制系统不仅可以保证发电机运行的可靠性和稳定性，而且可有效地提高发电机和电力系统技术指标。同步发电机励磁系统采用了PWM整流技术，实现励磁电流低谐波和励磁功率单元高功率因数转换，提高了发电机供电质量，并用MATLAB对设计系统做出仿真验证，证明该设计对改善发电机输出电压、提高功率单元电能利用率有明显效果。