Behavior of MC3T3-E1 Osteoblast Cultured on Chitosan Modified with Polyvinylpyrrolidone

The physical and chemical properties of four kinds of modified chitosan materials made by blending chitosan with polyvinylpyrrolidone （PVP） were investigated. All four of these modified chitosan materials were hydrophilic with water contact angles ranging from 59°to 69°. Fourier transform-infrared spectra of the modified materials showed a new band at 1288 cm^-1, implying formation of a surface physical interpenetrating network structure. Enzyme linked immunosorbent assay results indicated that much less fibronectin was adsorbed on the modified materials than on only chitosan. The viability of MC3T3-E1 osteoblasts cultured on the materials was assessed by 3-（4,5-dimethyl-2-thiazolyl）-2,5-diphenyl- 2H-tetrazolium bromide assay. The results show that adding PVP10000 into the chitosan promotes adhesion of MC3T3-E1 osteoblasts on the modified materials, but has no effect on cell growth and proliferation; while adding PVP40000 reduces cell adhesion, growth, and proliferation. The results suggest that the increased hydrophilicity of the material surface does not always improve its biocompatibility, which will influence the selection and design of biomaterials.     

BaCO3和SrCO3对水泥生料固硫行为的影响

针对水泥窑工艺，以合山东矿煤和贵州六盘水煤为研究对象，水泥生料为固硫剂，BaCO3和SrCO3为添加剂，进行燃烧固硫的试验研究，在讨论添加剂对水泥生料固硫效率影响的同时，借助XRD测试手段研究BaCO3和SrCO3对灰渣产物矿相组成的影响规律，并结合灰渣扫描电镜分析，探讨高温段添加剂对水泥生料的固硫效果的作用机理．结果表明：水泥生料中添加BaCO3和SrCO3后，在较低温度下促使SOx的析出量增加，水泥生料固硫效率降低．但是随着温度的升高，添加剂的加入，促使灰渣结构更为密实，从而更好地抑制CaSO4的高温分解，固硫效果改善．其中钙与添加剂的质量比为7时效果最好，但对于不同煤来说，最佳添加剂比例不同．     

Unusual discrepancy between TOMS and ground-based measurements of the total ozone in 2002—2003

Monitoring the atmospheric ozone is one of the key projects in the atmospheric and environmental sciences, and the decrease of ozone in stratosphere has aroused the interests of governments and public in the world. Mainly two methods are used to measure the total atmospheric ozone in the globe: ground-based observation mainly including Dobson and Brewer ozone instruments, and satellite measurement. The popular satellite products are the Total Ozone Mapping Spectrometer (TOMS) data provided by the National Aeronautics and Space Administration (NASA) of the United States of America.     

Research advances in the catalysts for the selective oxidation of ethane to aldehydes

Selective oxidation of ethane to aldehydes is one of the most difficult processes in the catalysis researches of low alkanes. The development of selective oxidation of ethane to aldehydes (formaldehyde, acetaldehyde and acrolein) is discussed. The latest progress of the catalysts, including bulk or supported metal oxide catalysts, highly dispersed and isolated active sites catalysts, and the photo-catalytic ethaneoxidation catalysts, partial oxidation of ethane in the gas phase, and the proposed reaction pathways from ethane to aldehydes are involved.     

THz time-domain spectroscopy of amino acids

The optical characteristics of four kinds of amino acids （tyrosine, arginine, histidine and glutamine） filled with nitrogen at room temperature were studied by THz time-domain spectroscopy （THz-TDS）. Well-resolved absorption and refractive spectrums between 0.I and 2.8 THz were obtained based on the physical model for extracting the optical parameters of materials in THz range. The results not only fill up the spectra gap of amino acids in far-infrared range, supply data for amino acid molecular identification and conformation analysis, but also demonstrate significantly potential to promote the research and application of biological materials in bio-chemical and medical fields by THz-TDS.     

Synthesis, characterization and properties of diamidodisilanes and azocyclosilane

Organosilicon compounds have been widely researched and have the maximum species besides hydrocarbons. In the progress of the research work, many scientists pay attention to the organic silicon compounds that have vari-ety reactive functional groups[1,2]. The difunctional disi-lanes are very active; they could react with not only the compounds containing reactive hydrogen atoms, but also the reactive polymers. Therefore, the disilanes with di-functional groups could be used as disilane substit…     

晋华宫矿高产高效矿井建设

晋华宫矿为大同煤矿集团公司特大型矿井之一。近年来，围绕“双高”矿井建设，针对现有的客观不利条件．积极采用煤体松动和人工强制放顶技术，并结合管理创新。加快“双高”矿井建设步伐，使全矿安全、生产、效益等方面取得了良好效果。     

利用Tsuprem4和Medici对200伏VDMOS进行虚拟制造

通过将已知工艺参数与工艺模拟软件Tsuprem4结合起来，将模拟结果直接导入器件模拟软件Medici，对击穿电压及阈值电压，终端保护环进行了模拟计算，获得了具体的设计参数，并对利用这两个软件进行虚拟制造的过程中需要注意的问题进行了阐述．     

硫酸盐还原菌及其在工业和矿山废水治理中的应用

介绍了硫酸盐还原菌（SRB）的分类、代谢机理和生长影响因子，并就SRB在工业废水和酸性矿山废水（AMD）厌氧生物修复方面的研究进展进行了综述，最后提出这方面研究尚存在的问题。     

丝履的社会功能及文化内涵研究

研究丝履的历史发展及其在服饰中特殊的地位,分析其社会功能及文化内涵.研究表明,丝履的社会功能着重体现在其等级性与标识性,是等级、身份和财富的象征;其文化内涵主要表现在材料的特殊性和我国传统的人文思想和审美取向.丝履在我国鞋文化的研究中最具代表性,在我国服饰史上有着重要的地位.