工业机器人的标准工时测定方法研究

随着生产智能化的发展,生产一线的劳动者逐渐变为工业机器人.针对工业机器人工作特点,提出单个工业机器人完成一道工序的标准工时构成要素;基于可靠性理论,分别推导出单个工业机器人在单故障和多故障下平均故障维修时间(MTTR)和平均保障延误时间(MLDT)的数学模型.通过案例分析显示该方法具有可行性,能够为企业正确核算生产能力、提高生产效率提供理论基础.     

顶空气相色谱法测定制药工业污水中的甲苯

采用顶空气相色谱法测定制药工业污水中的甲苯含量.顶空瓶中的制药工业污水样品在顶空仪上加热平衡后,其顶空气体进入气相色谱仪中分离和检测.方法的检出限为0.002 mg/mL,测定结果的相对标准偏差为3.27%～9.26%(n=5),回收率为92.7%～97.0%.与GB/T 11890-1989相比,本方法操作简便快速、检测限低,具有较高的进样稳定性,结果计算更加科学准确.     

国防科技工业应用化学一级计量站 全国化工标准物质委员会标准物质研究开发中心

<正>国防科技工业应用化学一级计量站(原国防科工委化学计量一级站)是1986年建于中国兵器工业第五三研究所的专业计量技术机构,同时也是兵器非金属材料理化检测中心、国家进出口商品非金属材料认可实验室、国防计量2501校准实验室、全国化工标准物质委员会标准物质研究开发中心。目前,专门从事化学计量的人员196人,其中研究员15人、高级工程师32人。拥有各种分析测试仪器150余台,建有国防计量最高标准30余项。主要承担国防科工委化学计量科研任务;国防系统化学量值传递,计量标准的考核、复查、人员培训;国防大型试验基地现场计量保证;标准物质的研制、定值、发放;进出口非金属材料检验;化学产品测试及未知样品的剖析等。先后完成计量科研课题40余项,有20余项达到国     

“变色冰火球”趣味实验的设计过程与思考

用乙酸钙、酒精和酚酞设计成"变色冰火球"趣味实验。介绍了该实验的设计缘由以及实验的原理、操作方法等,并探讨了"冰火球"变色的一些原因。最后,对中学化学实验教学提出了几点思考。     

Novel correction method for X-ray beam energy fluctuation of high energy DR system with a linear detector

A high energy digital radiography (DR) testing system has generated diverse scientific and technological interest in the field of industrial non-destructive testing. However, due to the limitations of manufacturing technology for accelerators, an energy fluctuation of the X-ray beam exists and leads to bright and dark streak artifacts in the DR image. Here we report the utilization of a new software-based method to correct the fluctuation artifacts. The correction method is performed using a high pass filtering operation to extract the high frequency information that reflects the X-ray beam energy fluctuation, and then subtracting it from the original image. Our experimental results show that this method is able to rule out the artifacts effectively and is readily implemented on a practical scanning system.     

“问诊”卷烟企业预算管理

最近几年,卷烟工业企业对全面预算管理工作日益重视,并结合企业自身情况进行了大量探索,全面预算管理的成绩显著,已成为卷烟工业企业集团管理的重要工具,但依然存在着不少问题,需要加以改进,以促使全面预算管理工作水平得到大幅提升。     

Ultrasonic guided wave inspection with array sensors

Ultrasonic guided wave becomes one of promising tool for monitoring various types of structures such as large steel plates, vessels, and pipes in oil, chemical or nuclear industry, because guided waves have ability to travel wide range of the target structure in a single position. However, analysis of guided wave signals acquired from structure is difficult on account of low S/N ratio and its dispersive nature. To improve S/N ratio and overcome dispersion effect, focusing techniques for guided waves are needed. Thus, in this study, focusing techniques for guided waves were developed in order to improve long range inspection ability, and performance of the developed techniques was verified by experiments.     

Nonlinear properties of quantum dot semiconductor optical amplifiers at 1.3 μm： errata

The authors regret that one of the coauthors was inadvertently omitted in the previous paper. E. Varene was a member of the Institut fur Festk6rperphysik at the Technische Universitat Berlin and contributed to the results on cross-phase modulation.     

Instructions for contributions

Applied Mathematics-A Journal of Chinese Universities,Series B(Appl.Math.J.Chinese Univ.,Ser.B)is a comprehensive applied mathematics journal jointly sponsored by Zhejiang University,China Society for Industrial and Applied Mathematics,and Springer-Verlag.It is a quarterly journal with the first issue published in 1993.It is not a translation of Applied Mathematics-A Journal of Chinese Universities,Series A,which is in Chinese.