β′－12H复相陶瓷界面结构研究

用气压烧结工艺制备β′－１２Ｈ复相陶瓷，并在高分辨电镜下对其界面结构进行研究．结果表明，β′与１２Ｈ相之间具有良好的界面结合，在晶界区域没有反应层和其它结构缺陷，界面上也几乎没有晶界玻璃相．在β′－β′晶界，三晶界处的玻璃相能渗入两晶界，在界面上总是存在１～２ｎｍ的非晶层．     

cDNA cloning and gene mapping of human homologs for Schizosaccharomyces pombe rad17, rad1, and hus1 and cloning of homologs from mouse, Caenorhabditis elegans, and Drosophila melanogaster

Mutations in DNA repair/cell cycle checkpoint genes can lead to the development of cancer. The cloning of human homologs of yeast DNA repair/cell cycle checkpoint genes should yield candidates for human tumor suppressor genes as well as identifying potential targets for cancer therapy. The Schizosaccharomyces pombe genes rad17, rad1, and hus1 have been identified as playing roles in DNA repair and cell cycle checkpoint control pathways. We have cloned the cDNA for the human homolog of S. pombe rad17, RAD17, which localizes to chromosomal location 5q13 by fluorescence in situ hybridization and radiation hybrid mapping; the cDNA for the human homolog of S. pombe rad1, RAD1, which maps to 5p14-p13.2; and the cDNA for the human homolog of S. pombe hus1, HUS1, which maps to 7p13-p12. The human gene loci have previously been identified as regions containing tumor suppressor genes. In addition, we report the cloning of the cDNAs for genes related to S. pombe rad17, rad9, rad1, and hus1 from mouse, Caenorhabditis elegans, and Drosophila melanogaster. These include Rad17 and Rad9 from D. melanogaster, hpr-17 and hpr-1 from C. elegans, and RAD1 and HUS1 from mouse. The identification of homologs of the S. pombe rad checkpoint genes from mammals, arthropods, and nematodes indicates that this cell cycle checkpoint pathway is conserved throughout eukaryotes.     

Li2B4O7晶体的比热,导温和导热性能

用ＤＳＣ和激光热导人义分别测定了Ｌｉ２Ｂ４Ｏ７（ＬＢＯ）晶体３５０－９７０Ｋ范围内的比热和６３０－９７０Ｋ范围内不同主晶轴方向的导温系数，并由此了导热系数和声子平均自由程。     

Neutrophils stimulated with a variety of chemoattractants exhibit rapid activation of p21-activated kinases (Paks): separate signals are required for activation and inactivation of paks

Activation of the p21-activated protein kinases (Paks) was compared in neutrophils stimulated with a wide variety of agonists that bind to receptors coupled to heterotrimeric G proteins. Neutrophils stimulated with sulfatide, a ligand for the L-selectin receptor, or the chemoattractant fMet-Leu-Phe (fMLP), platelet-activating factor, leukotriene B4, interleukin-8, or the chemokine RANTES exhibited a rapid and transient activation of the 63- and 69-kDa Paks. These kinases exhibited maximal activation with each of these agonists within 15 s followed by significant inactivation at 3 min. In contrast, neutrophils treated with the chemoattractant and anaphylatoxin C5a exhibited a prolonged activation (>15 min) of these Paks even though the receptor for this ligand may activate the same overall population of complex G proteins as the fMLP receptor. Addition of fMLP to neutrophils already stimulated with C5a resulted in the inactivation of the 63- and 69-kDa Paks. Optimal activation of Paks could be observed at concentrations of these agonists that elicited only shape changes and chemotaxis in neutrophils. While all of the agonists listed above triggered quantitatively similar activation of the 63- and 69-kDa Paks, fMLP was far superior to the other stimuli in triggering activation of the c-Jun N-terminal kinase (JNK) and the p38 mitogen-activated protein kinase (MAPK). These data indicate that separate signals are required for activation and inactivation of Paks and that, in contrast to other cell types, activated Pak does not trigger activation of JNK or p38-MAPK in neutrophils. These results are consistent with the recent hypothesis that G-protein-coupled receptors may initiate signals independent of those transmitted by the alpha and betagamma subunits of complex G proteins.     

Analysis of Planar Dielectric Waveguide with Mirror-Conjugate Chiralities in the Core and the Cladding

The propagation characteristics of a planar waveguide with mirror-conjugate chiralities filled in the core and the cladding (mirror-conjugate chirality waveguide) are presented. The effects of chirality on cutoff, dispersion and field distribution characteristics of the waveguide are studied. The results show that the waveguide with desired features can be made by appropriately selecting the chiralities of the core and the cladding, because the core chirality and cladding chirality have different influences on waveguide propagation characteristics.     

PLC-5/40C在烧结机上的应用

利用PLC-5／40C和6200编程软件，对50m^2烧结机进行了改造，实现了过程控制和顺序控制，并应用RSView监控软件进行人机界面设计，实现了系统的动态监控。     

基于分离度的图象特征提取与识别方法

对于图象中不同类别（以其统计分布函数一表征）的可识别性，分离度的统计定义可做出定量的描述。根据分离度在一一对应映射变换下的不变性，应用Ｋａｒｈｕｎｅｎ－Ｌｏｅｖｅ变换对两类分布撮识别特征，发现分离度只依赖于特征值最大和最小的两个特征向量。而且，分离度的大小依赖于特征值怀某个定定值的偏差。由此我们提出一个识别模型，使每次分类后的样本集的特征值都趋近于两上定值，从而得到最佳的识别效果。由该模型设计的     

图书馆局域网的建设和管理

文章介绍了图书馆局域网的建设概况，主要探讨了网络硬件和系统软件的选购、配置和网络安全及其对策等问题．     

三峡水库泥沙淤积预估

 在三峡工程可行性论证阶段，利用泥沙数学模型对三峡水库各种蓄水方案库区泥沙冲淤变化进行了预估。本文根据大量计算成果对三峡水库不同蓄水位方案的库区泥沙淤积量、淤积沿程分布、排沙率、保留库容、洪水位抬高等主要问题进行了论述，并分析了水库运用过程中泥沙冲淤变化特点。     

自动交换工作台

在通用机床两侧配置可自动交换的工作台，可使切削加工和辅助装卸工作同步进行，提高机床的有效利用率，降低生产成本。