Molecular Dynamics Simulation of Micro Mechanisms in Slip Deformation Theory of Crystals

Based on the discussion that there should be a micromechanism that causes a macroscopic slip of mono-crystal copper, molecular dynamics simulations with the analytical displacement feld around a crack tip have been carried out. The result of the simulation shows that macroscopic shear slip in an f.c.c. mono-crystal copper occurs as discrete time events. This is because cross-slips occur in many places in a material such that a macroscopic shear slip is blocked until some critical state of deformation. A macroscopic shear slip then occurs suddenly at the critical state in which the area of disordered atomic arrangement has stretched from one end of a crystal to the other end. The reason why macroscopic shear slips occur in the directions of the slip planes of a crystal is attributed to the fact that the areas of disordered atomic arrangement develop only along those directions.     

汽车制动性能自动检测系统的研制

介绍了一种基于AT89S52芯片的汽午滚筒反压式汽车制动力测试台的系统结构，进行了测试台主机的软硬件设计以及工业环境下的抗干扰设计。该系统操作简便，具有良好的可靠性和稳定性，而且测量精度高、制动迅速，已在实际中应用。     

交流电量的实时检测技术及实现

针对电力参数的实时高精度检测难题，介绍了一种用于交流电量(电压、电流、有功功率、功率因数、频率等)的采用双速率同步交流采样算法的实时自动检测技术。该系统基于16位单片机，以交流电量为检测对象，通过对工频的跟踪检测和双速率同步交流采样算法，提高系统的检测精度。文中阐述了该技术的原理、硬件实现和软件设计。经过实践证明，该技术在电力系统的智能检测中有很大的应用前景。     

X6125铣床数控化改造

通过对我院教学实习基地的一台X6125铣床结构和性能的研究，针对盘式凸轮加工的特点，并结合现有条件，确定了铣床的数控化改造方案，介绍了滚珠丝杠、步进电动机的选择设计以及数控系统软硬件的设计。改造后的铣床可提高生产效率，保证产品质量和减轻工人的劳动强度。     

白油加氢装置技术改造

对抚顺石油化工分公司石化三厂白油加氢装置进行技术改造，通过调整加氢工艺，采用一段加氢工艺生产高品级的加氢尾油，再经分馏系统生产出多种优级品的白油，满足了市场需求，并创造了可观的经济效益和社会效益。     

用兰纳-琼斯位能和单参数Wilson方程预测汽液平衡

根据兰纳-琼斯位能提出计算Wilson方程中同类分子间能量参数gii的一个简便方法,用于单参数Wilson方程可成功地预测二元体系气液平衡,预测精度与已有方法相当,且仅需要纯物质的Tc,Pc,Zc数据。     

单螺杆挤出过程的数值模拟

以三段七区物理模型为基础，采用面向对象程序设计语言VisualC ，对整个单螺杆挤出过程进行了数值模拟。所得压力。温度等工艺参数的模拟结果与实验值吻合较好，说明采用数学模型的正确性和数值算法的可行性。     

Measurement of the particle movement in the fountain region of a Wurster type bed

A non-intrusive technique to follow single particles in the fountain region of a spouted bed with draft tube, the Wurster coater, is developed and tested. Compared to other techniques found in literature, the measurement technique presented here is easy to handle, inexpensive and suitable for particles with a diameter down to 500 μm. The measurements are performed in a laboratory scale Wurster bed constructed of Plexiglas to allow optical access to the flow. A small quantity of the particles in the bed are marked with fluorescence. A UV lamp is used to excite the fluorescence and the marked particles are followed with a high-speed video camera equipped with an optical filter. A single marked particle in the fountain can be followed in 5-30 images in sequence at a frame rate of 125 fps. The particle position and velocity are calculated. The distribution of the particle trajectories maximum height is studied for different particle loading, jet air velocity and position of the Wurster tube. The technique can be used for the characterization of differences in process dynamics due to different operating conditions.     

Pulse height defect in pCVD and scCVD diamond based detectors

Polycrystalline (pCVD) and single crystal (scCVD) diamond films grown from Chemical Vapour Deposition (CVD), if sufficiently pure at Raman analysis, are very good materials for beam or flux monitors inside accelerators or nuclear reactors. This is because they are very hard to damage in high radiation fields and very resistant to high temperatures. Films of pCVD diamond are, however, not so good as spectroscopy detectors due to inhomogeneities induced by their growth in grains with the consequent presence of grain boundaries which worsen their energy resolution. The latter can be significantly improved by growing scCVD diamond films onto HPHT synthetic diamond substrates. We have shown that it is possible to measure the density of defects inside diamond specimens using as probes suitable penetrating nuclear radiations. With the preliminary results reported here we'll show that, bombarding CVD diamond films grown at Roma “Tor Vergata” with energetic protons and ⁴He, ⁶Li and ¹²C ions produced in the accelerators of Catania laboratories, the pulse height defects are higher than those in silicon detectors and likewise well described by a power law in the deposited energy. Furthermore, we'll show that pulse heights for the same particles seem to depend on the duration of the measurement, thus exhibiting a sort of depolarization of the insulator when exposed to the electric voltage which makes it a particle detector.     

模拟三相流化床中颗粒尺寸对单气泡传质系数的影响

本文在模拟三相流化床中,测量了单气泡的传质系数,实验结果表明颗粒直径对气-液传质系数影响显著。颗粒直径较大时,传质系数有明显提高。