Lattice Boltzmann Simulation of Sedimentation of a Single Charged Elastic Dumbbell in a Newtonian Fluid

Based on the lattice Boltzmann method, the sedimentations of elastic dumbbells with different charges in a Newtonian fluid under the same and different initial conditions are simulated. Due to the polarizing effects, there are Coulomb forces exerted on the charged elastic dumbbells during their sedimentations, which change their original motions significantly. All of the numerical results show that, if the charged elastic dumbbells are released at offset-centreline positions with zero velocity and settle under gravity, they fall down vertically off the centreline and their orientations tend to be the horizontal finally, and the distances apart from the centreline increase with the increasing charges of the elastic dumbbells.     

影响未来生活的科技

强劲PC只有手掌大小,家电控制尽在掌握,把显示器像报纸一样卷起来带走,连电子表都可以接收信息……这一切你可能连想都想不到,但是在不久的将来,这些可能就是你生活中随处可见的东西。     

ACM12864J液晶显示器在自动控制仪表中的应用

液晶显示技术重要而且实用，以液晶的光电效应制作的液晶显示器件是信息处理及显示的手段之一。本文重点介绍了ACM12864J显示器及其驱动器HD61202，并给出了一个应用实例。     

Field Emission of SiCN Thin Films Bombarded by Ar^＋ Ions

SiCN thin films were synthesized by a radio frequency chemical vapor deposition (RFCVD) system on P-type Si (1 0 0) wafers using C2H4, SiH4 and N2 as raw materials.In order to get rid of the oxygen absorbed on the surface and improve the characteristics of electron field emission, Ax^ ions of low energy were used to bombard the samples. The field emission characteristics of SiCN thin films before and after Ar^ bombardment were studied in the super vacuum environment of 10^-6 Pa. It was showed that the turn-on field (defined as the point where the current-voltage curve shows a sharp increase in the current density) decreased from 38 V/μm before bombardment to 25 V/μm after bombardment. And the maximum emission current density increased from 159. 2 to 267. 4 μA/cm^2. The composition before and after Ar^ bombardment was compared using X-ray photoelec-tron spectroscopy (XPS). Our results illustrated that the field emission characteristics were improved after the bombardment of Ar^ .