手征性向列相液晶的电光效应

本实验是将介电各向异性正负不同的向列相液晶作为主体,混入手征性向列相液晶与胆甾相液晶,制取了向列相——手征性向列相混合液晶和向列相——胆甾相混合液晶,并比较了它们的电光效应。将手征性向列相液晶混入介电分散型向列相液晶时截止频率提高,但将胆甾相液晶混入介电分散型向列相液晶时截止频率却没有变化。以介电各向异性为正的向列相液晶作为主体的混合液晶中,混入手征性向列相液晶的混合液晶能降低ch—N相变电压。介电各向异性为负的向列相液晶和手征性向列相液晶的混合液晶系中,其介电各向异性要依赖于手征性向列相液晶的重量比,重量比的增加导致混合液晶的介电各向异性由负变正。本文也讨论了向列相——手征性向列相混合液晶的电光效应,以及这种特性在显示装置上的应用等问题。     

"类流态"现象与裂纹形成

实验发现调质处理和高温淬火的45^#钢试样的裂纹周围均出现了“类流态”胞区,测定了胞区与基体的显微硬度,发现裂纹周围的“类流态”胞区比基体软,利用原子间结合力及薛罗根方程分析了裂纹形成与“类流态”现象相互促进的关系。     

聚合松香接枝功能基化合物的合成研究

采用常规加热法分别得到聚合松香接枝苏氨酸，酒石酸和柠檬酸的功能基化合物，并讨论了其合成条件．对软化点和红外进行了分析．聚合松香的接枝化舍物酸值增加，软化点降低，溶解度较大，还不适合做功能基高分子。需增大聚合松香接枝功能基化舍物的分子量和交联度．酸性强弱顺序与接枝的小分子酸酸性强弱相同，接枝酒石酸和柠檬酸化合物在有机溶剂中易溶，水中难溶．接枝苏氨酸化合物可以吸附铜铁钙三种金属离子．     

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.     

书名术语知多少

书籍的命名形式种类繁多,编著者通常依据书籍的内容、编写方式等赋名,术语较多,现将主要术语集录如下。文选　选录的文章,如《中华活页     

板坯连铸结晶器及振动装置的研究

从传热学和结构力学角度，分析了结晶器的温度场和应力场，采用解析法和有限元法计算了结晶器的热应力和变形。针对原来的正弦振动机构存在的问题，提出了改进方案：采用椭圆齿轮变速器实现非正弦振动，并分析了改造后的结晶器的振动规律。同时，对结晶器与板坯之间的摩擦力加以分析。采用非正弦振动使负滑脱时间短，正滑脱时间长，结晶器向上运动速度与铸坯运动速度差较小。振痕深度大为减轻，减少坯壳与结晶器的摩擦力，减少粘结漏钢，提高连铸机拉坯速度，铸坯表面质量明显提高。     

压力注浆技术在大直径灌注桩中的应用

随着城市高层和小高层建筑物的大量兴建，大直径灌注桩因其具有承载力高、无挤土、无振动、能贴近已建建筑物施工、适应性强等优点，已在桩基工程中得到广泛应用，但是大直径灌注桩的质量事故时常发生，严重影响了其承载力的发挥。近几年发展起来的桩端注浆技术在处理桩基质量事故时，不仅可以提高大直径灌注桩承载力，而且当设计合理、施工得当时能确保其质量稳定可靠，具有相当广阔的前景。     

基于时间轴小波变换的运动对象分割算法研究

对时间轴一维小波变换的视频运动对象分割算法进行了研究。将视频序列进行时间轴一维小波变换，利用变换后的高频帧信息提取出初步的运动掩模图像；进行数学形态学后处理，以消除各种噪声的影响和对象的不连通性，得到理想的运动掩模图像。实验结果表明该方法分割效果较好，分割出的运动对象可直接应用于基于对象的视频编码，且算法耗时较少。     

磁性音像档案的保管

磁性音像档案保护是新世纪声像档案工作的重中之重,也是做好各项基础工作的前提。本文从磁性音像档案的构成入手,在分析了其内部结构基础上,详细说明了影响其保管寿命的外界因素,提出了磁性音像档案保护的措施,最后指出了利用现代化保管方式对库房内的各个环境因素进行适时监测,为音像档案妥善保管与有效利用打下了坚实的物质基础。     

A Layered Zone Routing Algorithm in Ad Hoc Network Based on Matrix of Adjacency Connection

The hybrid routing protocol has received more attention recently than the proactive and the reactive, especially for large-scale and highly dynamic connection, in mobile ad hoc network. A crucial reason is that zone-layered is being utilized in the complex systems. A hybrid routing algorithm which is layered zone based on adjacency connection（LZBAC） is put forward under the background of a few members in network with steady position and link. The algorithm modifies storage structure of nodes and improves routing mechanism. The theoretical analysis and simulation testing testify that the algorithm costs shorter time of route finding and less delay than others.