压接电缆制作工艺研究

对复合材料压接型电连接器电缆的制作过程、工艺方法进行了研究，解决了压接电缆制作过程中的关键技术，对压接电缆的制作工艺和质量保证措施进行了探讨。     

高硬度薄壁筒形件数控车加工工艺

以典型零件加工为例,通过探讨高硬度薄壁零件在数控车床加工中存在的易变形、零件尺寸及表面粗糙度不易保证、断续切削时刀具易破损等技术问题,对加工难点进行分析,给出了工艺路线和加工方案,通过优化、完善夹具设计、加工程序和切削参数,使用新型刀具,并打破硬态切削的一些常规做法,从而有效解决高硬度薄壁类零件的车削加工难题。     

M/G/1排队系统性能梯度估计的非标准分析法

如何估计系统性能梯度是离散事件动态系统研究中的一个重要问题.系统性能对于概率参数的梯度无法用传统的摄动分析法来估计,我们从非标准分析的角度提出了一种基于Dirac δ函数的摄动分析算法,分析了相应估计量的强相合性和渐近无偏性.新算法在实现过程中需要用样条函数来近似δ函数,但可以同时估计M/G/1排队系统中顾客期望系统时间和忙期期望长度对概率参数的梯度.数值实验结果表明估计量的相对误差和无偏性检验值都比较小,新算法能够很好地估计M/G/1排队系统的性能梯度.     

美国机动工程协会(SAE)简介

概述美国机动工程协会(SAE)成立的背景和成员的组成,介绍SAE业务范围和标准制定过程以及SAE的现状与合作伙伴的情况.     

航空制造业对刀具的新要求

目前国内在切削刀具的全寿命监控和管理方面刚刚处于起步阶段,在未来一定时期内,自行设计、制造和使用好高效切削工具,促进我国早日实现从制造大国向创造大国的飞跃,无论对于中国的切削工具制造业还是航空制造业,都是必须面对和尽快解决的问题。     

混杂系统的双测度稳定性及应用

近年来混杂系统的性质一直为人们所关注.系统的稳定性是衡量一个系统的重要指标.主要讨论了混杂系统的双测度稳定性,给出混杂系统双测度稳定性的判别准则.最后,介绍了甘油连续方式发酵1.3-丙二醇的动力系统,并借助上面的版别准则说明此动力系统是双测度稳定的.     

基于资源共享的高校战略联盟研究

从资源共享视角,指出高校战略联盟是解决教育资源日显稀缺的一条重要途径。高校联盟过程中可以通过制定和实施资源共享发展战略,建立资源共享运行机制与相关制度,成立协调管理组织机构,建设网络共享环境等多种途径实现资源共享。     

2012–2014 China's Earth Observation and Earth Science Development

Human beings are now facing global and regional sustainable development challenges.In China, Earth observation data play a fundamental role in Earth system science research. The support given by Earth observation data is required by many studies, including those on Earth's limited natural resources, the rapid development of economic and social needs, global change, extreme events, food security, water resources, sustainable economic and urban development, and emergency response. Application operation systems in many ministries and departments in China have entered a stage of sustainable development, and the State Key Project of High-Resolution Earth Observation Systems has been progressing since 2006. Earth observation technology in China has entered a period of rapid development.     

清代丛书汇辑小学著作论略

清代小学研究发达,丛书收录小学著作的数量非常可观。综合性丛书收录小学著作,自《四库全书》以后,较明代有了较大发展。专科丛书在《说文》学著作和音韵学著作的汇辑上最为突出。此外,由于清代辑佚学的兴盛,辑佚类丛书中收录小学著作的数量也比较多。清代丛书汇集小学著作,对清代以来的语言学及语言学史研究,是重要的文献基础,具有很高的学术价值。     

Effect of nickel introduced by electroplating on pyrocarbon deposition of carbon-fiber preforms

In order to improve the deposition rate and microstructure of pyrocarbon, nickel was introduced by electroplating on carbon fibers and used as a catalyst during the deposition of pyrocarbon at 1000 C using methane as a precursor gas. The distribution of nickel catalyst and the microstructure of pyrocarbon were characterized by scanning electron microscopy（SEM）, energy dispersive spectroscopy（EDS）, X-ray diffraction（XRD）, and Raman micro-spectrometry. Results show that nano-sized nickel particles could be well distributed on carbon fibers and the pyrocarbon deposited catalytically had a smaller d002 value and a higher graphitization degree compared with that without catalyst. In addition, the deposition rate of pyrocarbon in each hour was measured.The deposition rate of pyrocarbon in the first hour was more than 10 times when carbon cloth substrates were doped with nickel catalysts as compared to the pure carbon cloths. The pyrocarbon gained by rapid deposition may include two parts, which are generation directly on the nickel catalyst and formation with the carbon nanofibers as crystal nucleus.