Heterocoagulation behavior of carbon black with surface encapsulation through emulsion polymerization

Nanocomposite microspheres containing styrene–acrylate resin, wax, and carbon black (CB) with desired CB dispersion were prepared through heterocoagulation. The CB surface was modified using conventional anionic emulsifier and anionic dispersants with different lengths of nonionic chains and reactivities or through polymer encapsulation via emulsion polymerization to regulate the dispersion and concentration of CB in the microspheres. Experimental results showed that anionic dispersants with long nonionic chains effectively dispersed and stabilized CB particles. Polystyrene (PS) was then encapsulated on the CB surface by using a reactive dispersant and a water‐soluble initiator of polymerization. The CB particles exhibited comparable pH stability with other heterocoagulation components. Overall, encapsulation through emulsion polymerization can be used to obtain not only high CB content but also improved CB distribution in the resulting microspheres. High coagulation efficiency can also be achieved using polystyrene‐encapsulated dispersed CB because of its high affinity to emulsifiers and reactive dispersants during dispersion. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43516.     

Measurement uncertainty evaluation of conicity error inspected on CMM

The cone is widely used in mechanical design for rotation, centering and fixing. Whether the conicity error can be measured and evaluated accurately will directly influence its assembly accuracy and working performance. According to the new generation geometrical product specification(GPS), the error and its measurement uncertainty should be evaluated together. The mathematical model of the minimum zone conicity error is established and an improved immune evolutionary algorithm(IIEA) is proposed to search for the conicity error. In the IIEA, initial antibodies are firstly generated by using quasi-random sequences and two kinds of affinities are calculated. Then, each antibody clone is generated and they are self-adaptively mutated so as to maintain diversity. Similar antibody is suppressed and new random antibody is generated. Because the mathematical model of conicity error is strongly nonlinear and the input quantities are not independent, it is difficult to use Guide to the expression of uncertainty in the measurement(GUM) method to evaluate measurement uncertainty. Adaptive Monte Carlo method(AMCM) is proposed to estimate measurement uncertainty in which the number of Monte Carlo trials is selected adaptively and the quality of the numerical results is directly controlled. The cone parts was machined on lathe CK6140 and measured on Miracle NC 454 Coordinate Measuring Machine(CMM). The experiment results confirm that the proposed method not only can search for the approximate solution of the minimum zone conicity error(MZCE) rapidly and precisely, but also can evaluate measurement uncertainty and give control variables with an expected numerical tolerance. The conicity errors computed by the proposed method are 20%-40% less than those computed by NC454 CMM software and the evaluation accuracy improves significantly.     

颗粒状石英砂熄弧性能的对比研究

本文用在直流条件下开断相应于最大电弧能量电流(I_2)的方法,对几种熔断器中常用的石英砂进行了熄弧性能的对比试验,并提出了熔断器填料熄弧性能的评审参数。试验结果表明:在开断大电流情况下,大林砂特别是大林2砂的熄弧性能较其它砂类优越。最后,对采用大林砂后熔断器发生炸裂问题提出了新的看法。     

基于功能仿真的RTL级低功耗优化

针对复杂集成电路设计中的功耗问题,提出了基于典型功能仿真和代码解析通过逻辑重组、操作隔离、预计算等技术实现寄存器传输级(RTL)低功耗的优化方法,该方法工作在RTL级,只需得到HDL仿真工具的支持。实验结果表明采用文章所提出的优化方法可显著降低电路功耗。     

基于Web的电力信息检索系统的设计与实现

文章在详细讨论动态Web数据库访问中间件技术ASP以及ADO组件与SQLServer结合的基础上,具体介绍了一个网上电力信息检索系统的设计与实现方法。该系统以WindowsNT为服务器平台、SQLServer2000数据库为后台、ASP技术编程,具有较好的安全性、可移植性和可扩充性。     

力觉临场感系统中环境动力学的遗传神经网络模型

针对环境的本质非线性特征，提出了一种新的基于遗传神经网络的力觉临场感系统中环境动力学模型的建立方法，阐述了其建模机理和建模算法，并通过实验验证其有效性。本文的论述对力觉临场感系统控制结构和控制算法的设计具有重要意义。     

焊后热处理对2091铝锂合金接头组织的影响

本文通过金相显微分析，透电镜观察及硬度测试，研究了２０９１铝锂合金焊后固溶时效处理对焊接接头显微组织的影响。结果表明，２０９１铝锂合金焊接接头中强化析析出数量少是接头弱化的根本原因；采用焊后固溶时效处理，可以改善合金接头组织，获得均匀分布的纱散强化相。     

ACTIG焊机引弧,稳弧电路的探讨

在分析ACTIG焊机电路的基础上,根据焊机原电路存在稳弧效果不理想和电阻热损耗大等问题,提出了两种新的改进方案,试验结果表明,改进方案简单可行。     

新型矿用LPTC陶瓷温度传感器

利用复合方法研制出一种ＬＰＴＣ电子陶瓷材料,并经作温度敏感元件,研制出适合井下恶劣环境,精度高、寿命长的温度传感器。并对探头包封和响应时间以及传感器的动、静态特性进行了测量。