Effect of Ion Dose on Growth of Relaxed SiGe Layer on Ion Implantation Si Substrate

Thin strain-relaxed Si0.8Ge0.2 films (57.6 nm) on the 30 keV Ar ion implantation Si substrates for different dose (1 × 1014, 5 × 1014, 3 × 1015 cm-2) were grown by ultra high vacuum chemical vapor deposition (UHVCVD) system.Rutherford backscattering/ion channeling (RBS/C), high resolution X-ray diffraction (HRXRD), Raman spectra as well as atomic force microscopy (AFM) were used to characterize these SiGe films. Investigations by RBS/C as well as HRXRD demonstrate that these thin Sio.8Geo.2 films could indeed epitaxially grow on the Ar ion implantation Si substrates. Under low dose ( 1 × 1014 cm-2) and medium dose (5 × 1014 cm-2) implantation conditions, the relaxation extents of SiGe films are 60.6% and 63.6%, respectively. However, high dose implantation (3 × 1015 cm-2) prompt the strain in epitaxial SiGe film to be close to full relaxation status (relaxation extent of 96.6% ). On the other hand, determinations of RBS/C also indicate the crystalline quality of SiGe film grown on high dose implantation Si substrate is nearly identical to that grown on low dose (1 × 1014 cm-2) implantation Si substrate.     

Compositional Optimum Design and Experimental Investigation of Rare Earth Containing Ceramic Composite

Based on the Al2O3/(W,Ti) C ceramic material, optimum design of the material compositions were carried out, which includes the theoretical calculation of the critical volume fraction of the reinforcement phase, and the optimum design based on the impact resistance, thermal shock resistance and wear resistance, etc. It is found that the optimum volume fraction of (W,Ti)C is 31.2%, 32.8% and 34%, respectively, which is corresponding with the best impact resistance, thermal shock resistance and wear resistance. After comprehensive consideration, the optimum volume fraction of (W,Ti)C in Al2O3/( W, Ti)C ceramic material is finally determined to be 30%. Then, effects of the content of rare earth yttrium on the mechanical property of the Al2O3/30vol% (W,Ti)C ceramic material were investigated experimentally. It indicates that when the content of yttrium is 0.25% ～ 0.5%, both flexural strength and fracture toughness of the rare earth containing ceramic material are further improved with the increment of approximately 10% ～16%.     

使用MCNP程序调整和优化启明星实验装置设计方案

用蒙特卡罗程序(MCNP)对验证ADS系统的启明星实验装置的设计方案进行了有效增殖因数(Keff)计算,并对与Keff密切相关的热区燃料元件栅距和热区厚度进行了最优参数的计算。结果表明,启明星实验装置的Keff能够达到设计的目标。     

用Pro/E实现对离子阱的结构仿

简述了三维四极离子阱的基本结构和工作原理。探讨了用Pro/E设计三维四极离子阱基本结构模型的一种简要方法,用参数方程建立基准辅助双曲线,得到了三维四极离子阱的一般实体模型图。     

载人两足步行机器人研究现状及其关键技术

鉴于在诸如医疗、福利等众多领域广泛的应用前景,载人两足步行机器人的研发逐渐成为机器人学领域的一个新的热点。介绍了目前载人两足步行机器人的研究现状和相关成果。然后,对该研究的关键内容——步态稳定控制、安全保护和减震系统等作了介绍和分析。     

皮革智能排样系统的开发

随着计算机技术的飞速发展，计算机智能技术也逐渐的被用到皮革生产的排样系统中。介绍了皮革智能排样系统的核心功能模块及其实现。提出了一种新的算法，来处理在不规则和有瑕疵的母板中对不规则形状的样片进行排样的问题。涉及了图形离散化算法、最优匹配算法和碰撞检测算法，并且给出了最终的排样效果图。     

Three-dimensional porous composite framework assembled withCuO microspheres as anode current collector for lithium-ionbatteries

The surface structure and material composition of current collectors have significant effects on the electrochemical performances of lithium-ion batteries(LIBs). In this work, a three-dimensional(3D) porous composite framework is applied as the anode current collector in LIBs. This unique 3D skeleton is composed of conductive carbon fiber/Cu core/shell fibrous structure. With an oxidation treatment upon the copper shell, the porous framework is assembled with CuO microspheres. Using mesocarbon microbead(MCMB) graphite powders as the active material, the cell with this 3D porous composite current collector shows an improved reversible discharge-charge capacity of 415 mAh g~(–1) at a current rate of 0.1 C after 50 cycles, which is much higher than that of the cell with a flat Cu foil(127 mAh g~(–1)). It is demonstrated that this unique fibrous network of the 3D current collector coupled with the morphological effects of the CuO microspheres greatly improve the cell performance in terms of electrical conductivity, reversible capacity and cycling stability.     

基于CFX的大型聚光光伏跟踪器动力设计

根据聚光光伏系统的设计参数,确定了CPV组件数目和布置形式。基于系统安装地点的历史风速和系统预期寿命,按照风速计算理论计算了跟踪器的设计风速。利用CFX对组件风压进行数值模拟,获得了动力设计需要的方位力矩和仰俯力矩。在此基础上,对跟踪器进行了动力设计,并讨论了方案的选择方法。     

基于3S不可移动文物管理系统的实现

提出对文物保护单位传统管理方式进行革新,将数据库技术、计算机网络技术、3S技术(地理信息系 统、遥感和全球定位系统)融为一体,基于GIS平台建立统一的内蒙古自治区不可移动文物信息管理系统,实现了自 治区文物数据完全共享的信息化管理和网络展示模式,为政府机关、文物机构的管理保护工作提供科学依据和决策 支持。     

基于小波神经网络的刀具切削状态特征识别

利用小波分析技术提取刀具状态信号特征量,用神经网络技术对信号的特征量进行训练仿真。结果表明,该方法实现了对刀具切削状态的特征识别。