高堆积密度壳聚糖的制备及其理化性质

通过半湿研磨法制备出堆积密度〉0．50g／mL的壳聚糖，其堆积密度提高60％～90％。此方法操作简单、无污染、成本低廉，同时处理后的壳聚糖不仅没有失去其碱性多糖的特点，而且溶解范围加宽、溶解速度加快、溶液黏度提高若干倍和味道香甜，是一种较理想的医药、食品添加剂。     

导电高分子吸波材料制备方法研究进展

作为一种新型的多功能材料,导电高分子吸波材料成为近年来研究的热点.重点阐述了近年来国内外导电高分子吸波材料的制备方法,包括纳米管、纳米线高分子吸波材料的模板法、电纺丝技术法等以及复合型导电高分子吸波材料的制备方法,并展望了导电高分子吸波材料的发展前景.     

对硝基苯胺制备实验的改进

在分析诸如酸度、温度等影响对硝基苯胺制备的因素的基础上,对实验教材中的酸用量和实验步骤作了适当调整;从效果上看,该调整不但能帮助学生在实验中较好地控制实验条件,同时也能获得满意的实验制备效果.     

Proteomic analysis of the kidney filtration barrier—Problems and perspectives

Diseases of the glomerular filter of the kidney are a leading cause of end-stage renal failure. The kidney filter is localized within the renal glomeruli, small microvascular units that are responsible for ultrafiltration of about 180 liters of primary urine every day. The renal filter consists of three layers, fenestrated endothelial cells, glomerular basement membrane, and the podocytes, terminally differentiated, arborized epithelial cells. This review demonstrates the use of proteomics to generate insights into the regulation of the renal filtration barrier at a molecular level. The advantages and disadvantages of different glomerular purification methods are examined, and the technical limitations that have been significantly improved by in silico or biochemical approaches are presented. We also comment on phosphoproteomic studies that have generated considerable molecular-level understanding of the physiological regulation of the kidney filter. Lastly, we conclude with an analysis of urinary exosomes as a potential filter-derived resource for the noninvasive discovery of glomerular disease mechanisms.     

大型输水工程阀门监造招标文件的编制

本文针对某工程阀门监造招标文件的编制进行了详尽的分析。该招标文件是在水利工程监理招标文件范本的基础上,参考其他行业监造合同范本,并针对其工程特点修改而成。文中阐述了招标文件中商务部分、技术文件、监造大纲、评标标准及方法的编制,以期为其他类似工程项目招标文件编制提供借鉴。     

基于ASP的植物生理图片系统的实现

为了满足我院《植物生理》理论教学和实践教学中图片展示的需要,弥补理论教学的不足,并为远程网络教学提供网络资源;从植物生理图片的管理出发,分析了《植物生理》教学的要求,以教学满足教学要求为目的,采用B/S架构,针对植物切片扫描成的图片进行数字化管理的要求,开发出一套适合切片图片管理的系统.系统实现了切片图片的存储、管理、...     

TiO2纳米管的制备方法及其改性

本文对TiO2纳米管制备技术、特点等进行了综述，且探讨了TiO2纳米管的改性方法及存在问题，并对今后的发展方向予以展望。     

新型耐腐蚀不饱和聚酯树脂的制备

根据高分子化学和材料腐蚀理论，设计耐腐蚀不饱和树脂的化学结构，并依据其特对树脂的化学结构进行优化，确定了新型耐腐蚀不饱和树脂的生产配方和工艺，经测试其耐腐蚀性能优良。     

Preparation method for supported metal catalysts using w/o microemulsion: Study on immobilization conditions of metal particles by hydrolysis of alkoxide

It was previously found that the silica-supported rhodium catalyst prepared using water-in-oil microemulsion had rhodium particles partly, or wholly, embedded in silica. In this work, consequently, we investigated the effect of hydrolysis conditions of tetraethylorthosilicate, employed as the source of silica, on the atomic ratio of surface rhodium in contact with the gas phase, to total surface rhodium of nanoparticles. This ratio is denoted as R in this paper. R became higher when the catalyst was prepared under the following hydrolysis conditions: a shorter hydrolysis time and a smaller amount of tetraethylorthosilicate. On the other hand, R showed the minimum value when the water content in the preparation solution was 33 vol%. From these results, it is demonstrated that it was important to form silica as early as possible in hydrolysis of TEOS in order to increase R values. In addition, the effect of R on the catalytic behavior in CO hydrogenation was investigated. At R values below 30%, the turnover frequencies increased with a decrease in R.     

Preferential grain growth and improved fatigue endurance in Sr substituted PZT thin films on Pt(1 1 1)/TiOx/SiO2/Si substrates

Pb(Zr_0.5Ti_0.5)O₃ and (Pb_0.9Sr_0.1)(Zr_0.5Ti_0.5)O₃ thin films were grown on Pt/TiO_x/SiO₂/Si substrates by chemical solution deposition. 10% Sr substituted PZT film showed high degree of (0 0 1) type preferential grain growth. Surface morphology revealed a clear correlation between preferred grain orientation and grain size. Room temperature dielectric constant was 1200 and 700 for the PZT and PSZT films, respectively. Dielectric loss reduced with Sr substitution. PZT film showed severe fatigue, and hence the polarization reduced to 20% of the initial value (24 μC/cm²) after 10⁸ cycles where as PSZT showed less fatigue, 75% of the initial polarization (12 μC/cm²) was retained after 10⁸ switching cycles.