基于XPE的嵌入式DVR系统的设计与实现

介绍了一种基于XPE的嵌入式DVR系统的设计与实现方法.该系统采用英特尔凌动处理器作为硬件平台,采用Windows XP Embedded with SP2作为软件平台,能有效克服目前嵌入式DVR处理性能有限而PC式DVR配机繁琐与兼容性问题及不稳定因素.详细介绍了XPE操作系统的开发过程以及FBWF写保护功能的原理和实现方法.基于该方案设计的嵌入式DVR系统经过实际测试,达到了预期的设计效果.     

Development of a reference strain approach for assessment of fracture response of reeled pipelines

As a result of recent increase in exploitation of hydrocarbon resources in harsher environments and also installation techniques which utilize the materials plastic deformation capacity, accurate assessment of fracture response of pipelines subject to large plastic strains (e.g., typical of reeled pipes) has attracted particular interest nowadays. In this paper, an approach, based on the evaluation of the J-integral, is developed for assessing the integrity of such pipelines, manifested in a model of a pipeline with a circumferential part-through crack subjected to plastic bending. The proposed approach is an extension of the reference strain method developed earlier by other researchers, and takes advantage of the displacement controlled loading nature in such pipes (thus being suitable for Strain Based Design methodologies), and the resulting high strain levels, which often cause fracture response of the material in the plastic regime. The developed formulation relates the fracture response of the pipe (in terms of the non-dimensionalized J-integral) as a linear function of the axial strain in the pipe at its uncracked state. A series of 300 3D nonlinear finite element models using the ABAQUS software were analyzed in preparation of the equation that could assess the fracture response of such pipes with great accuracy. The resulting equation, calibrated by the finite element results, can predict the fracture response of pipes with a maximum error of 2% for a practical uncracked material strain range of 1.5% ? ε_unc ? 4%.     

铁铝红颜料的研制与生产探讨

铁铝红是一种发色鲜艳、生产稳定、价格低廉的颜料，为提高该颜料在基础釉中的适应性，文章通过对比实验数据分析，对颜料的配方和生产方法进行了探讨，并提出了实际性的生产方案。     

PROFINET CBA组件的应用实现

PROFINET是基于工业以太网的开放标准,PROFINET基于组件的自动化（CBA）技术通过采用标准自动化组件实现了分布式自动化系统简单高效的互联。本文研究了PROFINET CBA的通信原理、模型,基于PI组织的PROFINET CBA Runtime Source代码开发了PROFINET CBA自动化组件,实现了PROFINET CBA组件之间的实时通信,对于构建基于PROFINET CBA的分布式通信系统具有一定的工程意义。     

跨校教学在建筑系研究生班设计课程中的应用

本文提倡以人的终身教育为目标的教育思想;结合香港社会和经济特点,介绍了以课题为核心和以网站为基础的高等 教育改革的思想。最后介绍了香港大学建筑系研究生一年级与清华大学和柏林艺术大学的一项合作设计。     

电解金属锰废渣返土还真的试验研究

介绍了电解金属锰废渣专用基示范工程测产验收情况，着重对电锰渣返土还真立论依据及技术要点进行了分析。     

An Improved Particle Swarm Optimization Algorithm Based on Ensemble Technique

An improved particle swarm optimization （PSO） algorithm based on ensemble technique is presented. The algorithm combines some previous best positions （pbest） of the particles to get an ensemble position （Epbest）, which is used to replace the global best position （gbest）. It is compared with the standard PSO algorithm invented by Kennedy and Eberhart and some improved＇PSO algorithms based on three different benchmark functions. The simulation results show that the improved PSO based on ensemble technique can get better solutions than the standard PSO and some other improved algorithms under all test cases.     

Al2O3基纳米复合陶瓷刀具切削不锈钢的实验研究

实验研究了Al2O3基纳米复合陶瓷刀具ASs与LTN连续干切削奥氏体不锈钢1Cr18Ni9Ti时的切削性能。结果表明,在相对较高的切削速度下,两种刀具表现出较好的切削性能,其中ASs刀具的主要磨损机制是粘结磨损和微崩刃,而LTN刀具则主要是粘着剥落;在相对低速下切削时,两种刀具都发生粘结破损失效。     

SCION系列GC-MS的创新技术及其在检测分析中的应用

SCION SQTM单四极杆质谱和SCION TQTM三重四极杆质谱为分析工作者提供了专为气相色谱设计的GC-MS平台。SCION系列气质联用系统设计简单易用,灵敏度可靠高,性能稳固稳定耐用,通过精巧的设计和人性化的软件接口,可以方便的完成食品分析与检测、环境分析、法医学/毒理学、运动医学/兴奋剂检测、石油/燃料与碳氢化合物等众多领域的分析工作。为了评估仪器性能,我们使用SCION TQ三重四极杆质谱建立了258种农药残留的分析方法。方法建立过程中使用了软件中新的基于化合物的筛查（CBS）功能大大提高了分析效率。同时使用基质添加标准品溶液进行校正,显示出了SCION TQ优异的灵敏度,良好的线性范围及精密度。     

Reliability-based design optimization of knuckle component using conservative method of moving least squares meta-models

This paper discusses reliability-based design optimization (RBDO) of an automotive knuckle component under bump and brake loading conditions. The probabilistic design problem is to minimize the weight of a knuckle component subject to stresses, deformations, and frequency constraints in order to meet the given target reliability. The initial design is generated based on an actual vehicle specification. The finite element analysis is conducted using ABAQUS, and the probabilistic optimal solutions are obtained via the moving least squares method (MLSM) in the context of approximate optimization. For the meta-modeling of inequality constraint functions, a constraint-feasible moving least squares method (CF-MLSM) is used in the present study. The method of CF-MLSM based RBDO has been shown to not only ensure constraint feasibility in a case where the meta-model-based RBDO process is employed, but also to require low expense, as compared with both conventional MLSM and non-approximate RBDO methods.