老式选矿厂带式输送机电气系统的改造

分析了某老式选矿厂带式输送机电气系统在启动方式、运行方式、联锁系统三个方面存在的问题,介绍了改造后的带式输送机电气系统在这三个方面采取的具体解决办法。实际应用表明,改造后的带式输送机电气系统运行稳定、可靠。     

Soft Surface Nanostructure with Semi-Free Polyionic Components for Sustainable Antimicrobial Plastic

Surface antimicrobial materials are of interest as they can combat the critical threat of microbial contamination without contributing to issues of environmental contamination and the development drug resistance. Most nanostructured surfaces are prepared by post fabrication modifications and actively release antimicrobial agents. These properties limit the potential applications of nanostructured materials on flexible surfaces. Here, we report on an easily synthesized plastic material with inherent antimicrobial activity, demonstrating excellent microbicidal properties against common bacteria and fungus. The plastic material did not release antimicrobial components as they were anchored to the polymer chains via strong covalent bonds. Time-kill kinetics studies have shown that bactericidal effects take place when bacteria come into contact with a material for a prolonged period, resulting in the deformation and rupture of bacteria cells. A scanning probe microscopy analysis revealed soft nanostructures on the submicron scale, for which the formation is thought to occur via surface phase separation. These soft nanostructures allow for polyionic antimicrobial components to be present on the surface, where they freely interact with and kill microbes. Overall, the new green and sustainable plastic is easily synthesized and demonstrates inherent and long-lasting activity without toxic chemical leaching.     

形状记忆聚氨酯

论述了形状记忆聚氨酯的理论模型和数学模型,分析了形状记忆聚氨酯的合成条件和制备技术,介绍了形状记忆聚氨酯的性能、用途及其研究现状,并指出了该材料的不足之处,对今后的研究方向提出了建议。     

Cu(II)‐incorporated,histidine‐containing,magnetic‐metal‐complexing beads as specific sorbents for the metal chelate affinity of albumin

N‐Methacryloyl‐(L )‐histidine methyl ester (MAH) was synthesized from metharyloyl chloride and histidine. Spherical beads with an average size of 150–250 μm were obtained by the suspension polymerization of ethylene glycol dimethacrylate and MAH in an aqueous dispersion medium. Magnetic poly(ethylene glycol dimethacrylate‐co‐N‐Methacryloyl‐(L )‐histidine methyl ester) [m‐p(EGDMA‐co‐MAH)] microbeads were characterized with swelling tests, electron spin resonance, elemental analysis, and scanning electron microscopy. The specific surface area of the beads was 80.1 m²/g. m‐p(EGDMA‐co‐MAH) microbeads with a swelling ratio of 40.2% and 43.9 μmol of MAH/g were used for the adsorption of bovine serum albumin (BSA) in a batch system. The Cu(II) concentration was 4.1 μmol/g. The adsorption capacity of BSA on the Cu(II)‐incorporated beads was 19.2 mg of BSA/g. The BSA adsorption first increased with the BSA concentration and then reached a plateau, which was about 19.2 mg of BSA/g. The maximum adsorption was observed at pH 5.0, which was the isoelectric point of BSA. The BSA adsorption increased with decreasing temperature, and the maximum adsorption was achieved at 4°C. High desorption ratios (>90% of the adsorbed BSA) were achieved with 1.0M NaSCN (pH 8.0) in 30 min. The nonspecific adsorption of BSA onto the m‐p(EGDMA‐co‐MAH) beads was negligible. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 2669–2677, 2004     

手性化合物及其高效液相色谱分离影响因素

本文简要介绍了手性化合物,并对手性化合物的高效液相色谱拆分机理及影响拆分的实验因素进行了讨论。     

羧甲基壳聚糖-聚乙烯醇渗透汽化膜分离乙醇-水的性能

本文制备了羧甲基壳聚糖-聚乙烯醇渗透汽化膜,研究了羧甲基壳聚糖和聚乙烯醇配比、戊二醛交联时间以及操作温度和乙醇浓度等因素对膜分离乙醇-水性能的影响。实验结果表明,当乙醇含量较低（10（wt）%）时,该膜优先透醇,羧甲基壳聚糖与聚乙烯醇的比例1∶1时,膜的分离因子达到最大16.45（wt）%的乙醇溶液）;随着戊二醛交联时间的增加,膜的渗透通量减小而分离因子增大;操作温度升高,膜的渗透通量增大,而分离因子降低。     

杆式破甲弹风洞试验研究

对杆式头部破甲弹气动分析和风洞试验，可弄清杆形头部的作用机理，获得可靠的气动数据，并可了解杆形头部的结构、形状、尺寸对气动力及稳定性的影响，为选取弹丸最佳外形提供了依据。     

基于偏时域相干分析的频谱混叠信号分离方法

提出一种基于偏时域相干分析的频谱混叠信号分离方法。该方法依据参考信号,利用偏时域相干函数,通过对信号分量与混合信号的功率比进行定量分析得到信号的瞬时混叠模型,最后按照瞬时混叠的逆过程分离出各信号分量。该方法与自适应分离方法的输入信号模型等价,且概念、算法简明。典型信号条件下的仿真实验表明在其功能与自适应分离方法基本相同的情况下,信号分离的准确度优于自适应方法。     

邻、对氯甲苯的精馏分离计算

计算了精馏分离对于不同的邻,对氯甲苯的分离要民需的理论板数,比较了两塔流程与三塔流程的优缺点,选择三塔流程进行手工计算和ASPEN PLUS计算机程序计算,得出了满意的结论。     

载重斜交轮胎肩空的原因分析及改进措施

载重斜交轮胎肩空故障的解剖分析表明,肩空主要发生在轮胎使用的中期,大部分是由于生热引起的热肩空,主要集中在胎面和缓冲层之间、缓冲层端点附近,而且肩空轮胎胎肩基部胶一般较厚。肩空的改进措施主要是合理设定断面水平轴高度,改进胎肩花纹设计,减小胎肩基部胶厚度,调整缓冲层及优化轮胎胎面胶料、缓冲层胶料的配方设计等。