Electrodeposition of Ni-Co-Fe2O3 composite coatings

Ni-Co-Fe₂O₃ composite coatings were electrodeposited using cetyltrimethylammonium bromide (CTAB)-modified Watt’s nickel bath with Fe₂O₃ particles dispersed in it. The effects of the plating parameters on the chemical composition, structural and morphological characteristics of the electrodeposited Ni-Co-Fe₂O₃ composite coatings were investigated by energy dispersive X-ray (EDS) spectroscopy, X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The results reveal that Fe₂O₃ particles can be codeposited in the Ni-Co matrix. The codeposition of Fe₂O₃ particles with Ni-Co is favoured at high Fe₂O₃ particle concentration and medium stirring, and the deposition of Co is favoured at high concentration of CTAB. Moreover, the study of the textural perfection of the deposits reveals that the presence of particles leads to the worsening of the quality of the observed 〈220〉 preferred orientation. Composites with high concentration of embedded particles exhibit a preferred crystal orientation of 〈111〉. The more the embedded Fe₂O₃ particles in the metallic matrix, the smaller the sizes of the crystallite for the composite deposits.     

EFT/B interference transmission model and method of anti-interference in a coal mine monitoring substation

Coal mining monitoring system has been enforcing tests for the immunity of Electromagnetic Compatibility (EMC) since 2006.However,not all monitoring substations can pass the Electrical Fast Transient/Burst (EFT/B) immunity test and the explosion-proof test simultaneously.In order to enhance EMC,the EFT/B interfere transmission model was presented at the substation power port,after the EFT/B test method was used to analyze the monitoring substation power ports.Hence,a low-pass filter was designed by using the simulation software PIPICE and an anti-jamming method was proposed by way of a parallel connection of the discharge interfere circuit and the low-pass filter.The improved complex EMI filter was made up of an interference discharge device and a filter.The dynamic equivalent circuit was proposed for the EFT/B immunity test.As a result,the monitoring substation has passed the EFT/B immunity and explosion-proof tests with the complex filter.It is concluded that the complex EMI filter has significantly enhanced the immunity of the coal mining monitoring system.     

基于PC/104的转塔控制系统CAN总线接口设计

在复杂的电磁环境下,采用CAN总线作为实时通讯总线是一个很好的选择。基于PC/104的某转塔控制系统CAN总线的接口设计采用经典的SJA1000作为CAN总线控制器,82C250作为CAN总线收发器,提出了一种采用CPLD实现PC/104总线和SJA1000总线间的读写时序转换的实用技术,并在通信通道上采用光电隔离技术,从而实现了系统的CAN通讯接口设计。该设计简洁可靠,可以很容易地移植到其它嵌入式系统中,并且设计已在某型转塔的调试中得到反复验证。     

Ca—Mg系复合凝聚剂富集分离造纸法烟草薄片废水处理及资源化研究

采用制备的Ca—Mg系复合凝聚剂,对造纸法烟草薄片废水进行高效固-液分离,以大大降低后续生化处理负荷。获得的污泥固体富含烟碱类物质而进一步提取,用于生物源杀虫剂的活性成份;提取后的污泥固体用作粉状杀虫剂的载附剂,完全达到资源化利用。采用该法单级分离COD去除率可达到70％-80％,具有一定实用价值。     

Pro/Engineer在模具制造中应用

本文Pro／Engineer是由美国PTC公司开发并且发展成为目前最普及、最优秀的CAD／CAM／CAE软件。结合笔者近年的教学工作和实践经验,简单介绍Pro／Engineer软件的特点和在模具设计前的准备,以及Pro／Engineer软件在模具制造中的应用。     

基于Pscad/Emtdc电网合环仿真的研究

本文以抚州金巢变电站10kV配电网合环为例,基于电磁暂态仿真软件PSCAD/EMTDC准确地搭建了系统仿真模型,以解决配电网合环操作过程中可能出现的涌流现象引起保护误动作。提出在合环点两侧相位差较小时候合环,或者通过调整变压器分接头以减小合环点两端母线电压差,从而减小合环电流。     

4-甲基苯甲酸催化加氢合成4-甲基环己基甲酸的研究

以钌/炭为催化剂,在氢氧化钠水溶液介质中,4-甲基苯甲酸(4-MPA)催化加氢制备4-甲基环己基甲酸(4-MHA).实验条件下,无脱羧副反应产生,4-甲基环己基甲酸的选择性为100%.碱液种类对转化率有一定影响,与氢氧化钠水溶液相比,氢氧化钾水溶液具有较高的转化率;碱液浓度对转化率有较大影响,当n(氢氧化钠):n(4-甲基苯甲酸)大于等于1.25时,转化率达到最大值,120℃,2 MPa条件下,反应95 min后,4-甲基苯甲酸转化率为97.82%.反应速率随载体比表面积的增大而增大.     

负载型复合载体对Ni基催化剂催化性能的影响

将ZrO2直接负载在MxOy（Al2O3,SiO2,CeO2）上组成负载型ZrO2/MxOy复合载体,并以此负载型复合载体制备Ni基催化剂,用BET、XRD、TPR和TPD等对催化剂的比表面积、晶相结构、还原性能等进行了表征,同时以CO2重整CH4为探针考察了催化剂的活性和稳定性。结果表明,复合载体对Ni基催化剂的性能有较大的影响：Ni/ZrO2/SiO2具有较好的初活性,但反应5 h后明显下降;Ni/ZrO2/Al2O3在反应50 h后CO2和CH4的转化率基本保持不变。     

脂肪醇生物活性和理化性质的QSAR/QSPR研究

为了研究脂肪醇结构-性质(活性)的定量关系,用相对键长取代拓扑距离,结合距离矩阵,提出了距离调和拓扑指数Te,Te和醇的许多理化性质和生物活性具有良好的相关性.用Te及δ(醇中和羟基相连的碳原子的支化度)与脂肪醇的溶解度、辛醇/水分配系数、急性生物毒性、蒸发热、摩尔磁化率关联,复相关系数分别为0.9955,0.9951,0.9941,0.9964,0.9968,优于文献.同时与脂肪醇的气相色谱保留指数也相关得很好,相关系数为0.9956.结果表明,Te指数可用于醇多种理化性质和生物活性的预测.     

Evaluation of PLGA/chitosan/HA conduits for nerve tissue reconstruction

A micro-envioment for nerve cells and tissue growth were designed and constructed via surface modification of poly(L-lactide-co-glycolide)(PLGA) with chitosan and hydroxyapatite(HA). The poly(L-lactide-co-glycolide)/chitosan/hydroxyapatite (PLGA/chitosan/HA) conduits were manufactured by a combined solvent casting and particulate leaching technique. The conduits were highly porous with an interconnected pore structure and 76.5% porosity. Micropores with 50–100 micrometer diameter were formed in the conduits. In vivo application of PLGA/chitosan/HA conduits for reconstruction of 10 mm sciatic nerve defect was assessed by the walking track analysis, the quantifying of the wet weight of tibialis anterior muscle and the histological assessment. The conduits in host rats in vivo can not only be an effective in promoting regenerating of nerves but can also lead to favorable nerve functional recovery. Funded by the National Natural Science Foundation of China(No.50774096)