盒形件侧壁冲孔模设计

盒形件侧壁冲孔模设计甘肃工业大学（甘肃兰州７３００５０）李定图１所示盒形零件，材料为１０钢，毛坯经过前几道工序的拉伸、切边后，剩下的最后工序是冲制侧壁上的４个孔和４个槽。由于该件属于大批量生产，因此为了提高工效，采用一次冲出的工艺。图１盒形零件１水平...     

磷块岩浮选机的放大方法研究(Ⅲ)——8米~3工业浮选机的设计与试验

根据扩试和半工业性试验确定的按传质系数相似的放大准则,在进一步验证的基础上,设计了8米~3磷块岩浮选机的主要结构参数和操作条件。按此条件比照选矿工业试验结果,证明放大方法是成功的,为工业浮选机开发和选型探索出了一条新途径。     

用于化学振荡研究的便携仪器

研制了适用于化学振荡研究的便携仪器，采用二种方法，动态跟踪化学反应振荡体系中某些状态量的变化。文中介绍了二种方法的基本原理，主要线路，最后还给出了某些应用的实际例子。     

The Modified Friction and Diffusion Coefficients of Fokker-Planck Equation and Relaxation Rates for Non-Maxwellian Scattering

In this paper, a new method to derive the Fokker-Planck coefficients defined by a non-Maxwellian velocity distribution function for the field particles is presented. The three- fold integral and the new Debye cutoff parameter, which were introduced by CHANG and LI, are applied. Therefore, divergence difficulties and the customary replacement of relative velocity g by thermal velocity vth are naturally avoided. The probability function P（v, Av） for non- Maxwellian scattering is derived by the method of choosing velocity transfer Av, which is a true measure of collision intensity, as an independent variable. The method enables the difference between small-angle scattering and small-momentum-transfer collisions of the inverse-square force to be well clarified. With the help of the probability function, the Fokker-Planck coefficients are obtained by a normal original Fokker-Planck approach. The friction and diffusion coefficients of the Fokker-Planck equation are modified for non-Maxwellian scattering and are used to investigate the relaxation processes for the weakly coupled plasma. The profiles of the relaxation rates show that the slowing down and deflection processes are weakened in the conditions of non-Maxwellian scattering.