计算机辅助装配规划研究综述

装配规划是影响产品装配质量和成本的重要因素,作为并行工程和计算机集成制造的关键支撑技术,计算机辅助装配规划涉及计算机、人工智能、自动化和机器人等领域。对目前该领域国内外的研究现状进行了综述,总结和剖析了经典方法、虚拟现实方法、软计算方法和协同方法等4 种具有代表性的装配规划技术,并对今后计算机辅助装配规划的发展方向和研究趋势进行了分析。     

Migration of 17 Photoinitiators from Printing Inks and Cardboard into Packaged Food – Results of a Belgian Market Survey

Photoinitiators are widely used to cure ink on packaging materials used in food applications such as carton boards and can contaminate the food by migrating into the food. In this contribution, a fast and reliable confirmation method for the determination of photoinitiators in dry foodstuffs is described: benzophenone (BP), 4,4′‐bis(diethylamino)benzophenone (DEAB), 2‐chloro‐9H‐thioxanthen‐9‐one (CTX), 1‐chloro‐4‐ropoxy‐9H‐thioxanthen‐9‐one (CPTX), 2,2‐dimethoxy‐ 2‐phenyl acetophenone (DMPA), 4‐(dimethylamino)benzophenone (DMBP), 2‐ethylanthraquinone (EA), 2‐ethylhexyl‐4‐dimethylaminobenzoate (EDB), ethyl‐4‐dimethylaminobenzoate (EDMAB), 4‐hydroxybenzophenone (4‐HBP), 1‐hydroxycyclohexyl phenyl ketone (HCPK), 2‐hydroxy‐4‐methoxybenzophenone (HMBP), 2‐hydroxy‐4′‐(2‐hydroxyethoxy)‐2‐methylpropiophenone (HMMP), 2‐isopropyl‐9H‐thioxanthen‐9‐one (ITX), 4‐methylbenzophenone (MBP), 4,4′‐bis(dimethylamino)benzophenone (MK) and 4‐phenylbenzophenone (PBZ). Dry foodstuffs were extracted using acetonitrile, followed by the addition of inorganic salts to precipitate fatty residues. After filtration, the extract was analysed using ultra‐performance liquid chromatography in combination with tandem mass spectrometry (UPLC‐MS/MS). Quantification was carried out using benzophenone‐d₁₀ (BP‐d₁₀) as internal standard. The presented method was successfully validated in‐house. Afterwards, the procedure was applied in a marketing study, investigating 97 dry foodstuffs purchased on the Belgian market. In 89% of the samples, at least one photoinitiator was detected. The photoinitiators BP, EDMA and DMPA were most frequently found, while some photoinitiators (CPTX, DEAB, DMBP, HCPK, HMBP and MK) were never detected. Copyright © 2016 John Wiley & Sons, Ltd.     

Nonresponse analysis and adjustment in a mail survey on car accidents

Statistical accident data plays an important role for traffic safety development involving the road system, vehicle design, and driver education. Vehicle manufacturers use data from accident mail surveys as an integral part of the product development process. Low response rates has, however, lead to concerns on whether estimates from a mail survey can be trusted as a source for making strategic decisions.     

大面阵数字航测相机像移补偿的实现

航空拍摄时,由于飞机与地面景物存在相对速度等原因的存在,发生像移是难免的。为了提高航拍图像的成像质量及相机分辨率,大面阵数字航测相机设计开发了像移补偿装置。采用了由步进电机驱动凸轮机构从而推动CCD平动的像移补偿方法。依据相应的补偿原理,得出航拍过程中的理论像移量。经过航拍实验验证,设计的补偿装置实际补偿后的地物位移量小于1/3像元。     

海洋能调查与评估工作术语标准化问题研究

术语标准化工作是标准体系建立的主要内容之一.我国在海洋能相关标准化工作方面已经取得了一定的成绩,但随着海洋能开发利用技术水平的提高,相关术语定义的内容和数量都已无法满足目前的要求:已有术语定义的不统一、不规范,并且缺少部分术语的定义.需要完善术语标准的概念体系、加大政策支持和资金投入力度、广泛开展合作交流和人才培养,以加快术语标准化工作的进度,为行业的发展提供科学依据.     

我国黄金地质勘查取得新进展

介绍了我国黄金地质勘查取得新进展。文中从我国重点矿区深部勘探取得突破、在西部地区发现了一批大型、特大型金矿。新的找矿理论、找矿方法广泛应用,地质投入增加以及勘查机制创新等方面探讨对我国黄金地质勘查产生的巨大推动作用。     

基于AutoCAD用VB二次开发零件测绘CAD系统

以模块化设计思想为指导,以Visual Basic为开发工具,对AutoCAD软件进行二次开发,研制出了用户界面友好的机械零件测绘CAD系统.该系统实现了计算绘图一体化,能显著提高测绘效率.     

正余弦定理在经纬仪导线非已知点设站的探讨

针对现场经常出现两测点被破坏的情况,利用数学原理解决此类测量问题,对煤矿生产有实际的指导意义。     

煤巷锚杆支护的矿压监测

随着锚杆支护技术的不断推广应用,人们已经认识到矿压监测的重要性和必要性。因此对锚杆支护的矿区进行比较全面、系统的监测,并使监测工作走向正规化、日常化已势在必行。文章对矿压监测的方法及注意事项进行了论述。     

煤矿6 kV供电系统单相接地时零序电流及零序功率相位角的测量

在分析煤矿6 kV系统单相接地(漏电)保护原理的基础上,重点介绍了煤矿6 kV供电系统单相接地试验时零序电流及零序功率相位角的测量和测量结论。