多芯片组件中时钟线无时延偏差的改进四通孔(v4R)算法

由于多芯片组件(MCM)布线中所使用的四通孔(v4R)算法在时钟线网布线中不考虑其无时延偏差的特殊布线要求，会使同步功能失控。针对这一缺陷，对MCM的时钟布线提出了一种新的方法。通过引入MMM(Method of Meansand Medians)方法，使得自动布线结果中，时钟源点到各作用单元的时延相等，从而改进了v4R算法。     

CD44v6、E-cadherin和ki-67蛋白质与腮腺多形性腺瘤的生物学行为相关性研究

为检测腮腺多形性腺瘤中CD44v6、E-cadherin和ki-67蛋白表达,以探讨其与腮腺多形性腺瘤生物学行为的相关性。应用免疫组织化学SP法染色检测腮腺多形性腺瘤组、多形性腺瘤恶变组和瘤旁非瘤组织组各组间CD44v6、Ecadherin和ki-67蛋白表达。结果显示,(1)CD44v6、E-cadherin和ki-67在腮腺多形性腺瘤组中的阳性表达率分别为100%、96%和73.8%;(2)E-cadherin和ki-67在腮腺多形性腺瘤组、多形性腺瘤恶变组和瘤周非瘤组织间的阳性表达率均有差异,其表达与腮腺多形性腺瘤的浸润转移有关;(3)CD44v6在腮腺多形性腺瘤组与瘤周非瘤组织组,多形性腺瘤恶变组与瘤周非瘤组织组中的表达有统计学差异。由此可知,E-cadherin和ki-67与腮腺多形性腺瘤的生物学行为有关,可作为新的肿瘤标志物,其表达对判断预后有一定的价值。     

垂直主振系冲击消振运动过程分析及仿真研究

提出一种垂直主振系冲击消振力学模型，在此基础上对该模型的典型运动过程进行了定性分析，并使用MATLAB的Simulink组件建立了仿真模型，对系统的运动性状进行的初步研究，为以后的相关理论研究打下了一定基础。     

几种特殊图类的圈权估计

本文证明了设Ｇ为２－连通简单权图．若对任一ｕｖ∈Ｅ（Ｇ），ｗ（ｕ）＋ｗ（ｖ）＞ｋ；且满足下列 条件之一：（ｉ）Ｇ为二部图，且任一ｅ∈Ｅ（Ｇ），ｗ（ｅ）＞０；（ｉｉ）Ｇ的连通度为２；（ｉｉｉ）Ｇ为阶数不小 于６的３正则图；（ｉｖ）Ｇ为阶数不小于６的轮形图，则Ｇ含圈Ｃ使ｗ（ｃ）＞ｋ．另外，本文还找到 了一些２－连通权图Ｇ．对任一ｕｖ∈Ｅ（Ｇ）．ｗ（ｕ）＋ｗ（ｖ）＞ｋ，但Ｇ不含权至少为ｋ的圈，且其最优 圈不都是Ｈａｍｉｌｔｏｎ圈．     

独立随机变量平方和的极限定理

设X_1,X_2,…为相互独立的随机变量序列,EX_k=0。EX_k~2=μσ_k~2.k=1.2,…B_n=sum from k=1 to n (σ_k~2),X_n~2=sum from k=1 to n(X_h~2)。若各X_k再满足一些条件,则我们有     

Isolation of human epidermal stem cells by adherence and the reconstruction of skin equivalents

The isolation of human epidermal stem cells is critical for their clinical applications. In the present study, we isolated three populations of epidermal keratinocytes according to their ability to adhere to collagen type IV: i.e., rapidly adhering (RA), slowly adhering (SA), and non-adhering (NA) cells. The aim of this study was to characterize RA cells and to investigate the possibility of using these cells for epidermis reconstruction. To identify RA cells, flow cytometric analysis was performed using anti-₆ integrin and anti-CD71 antibodies. RA cells express high levels of ₆ integrin and low levels of CD71, which are considered as markers of an epidermal stem cell nature. Furthermore, electron microscopy showed that RA cells are small and have a high nuclear to cytoplasmic ratio, whereas SA and NA cells have well-developed cellular organelles and abundant tonofilaments. Western blot analysis showed that RA cells are slow cycling and express p63, a putative epidermal stem cell marker, whereas SA and NA cells express c-Myc, which is known to regulate stem cell fate. To compare epidermal regenerative abilities, skin equivalents (SEs) were made using RA, SA, and NA cells. The epidermis constructed from RA cells was well formed compared to those formed from SA or NA cells. In addition, only SEs with RA cells expressed ₆ integrin and ₁ integrin at the basal layer. These results indicate that RA cells represent epidermal stem cells and are predominately comprised of stem cells. Therefore, the isolation of RA cells using a simple technique offers a potential route to their clinical application, because they are easily isolated and provide a high yield of epidermal stem cells.Received 2 July 2004; received after revision 20 August 2004; accepted 10 September 2004     

洛仑兹力公式中v的寓意剖析

在电磁场量统一性的基础上，指出了洛仑兹力公式中的速度ｖ是电荷相对观察者的运动速度，顺便述及安培力的成因。     

垢层对碳钢腐蚀影响探究

通过测定比较碳酸钙（分析纯）、碳酸钡（化学纯）、三氧化二铁（分析纯）、皂土（化学纯），四氧化三铁（化学纯）和滤渣几种垢层的自腐蚀电位，偶接后的电偶电流来研究它们对Ａ３碳钢腐蚀的影响。     

VA族元素杂苯研究现状

本文综述了VA族元素杂苯,吡啶、磷杂苯、砷杂苯、锑杂苯和铋杂苯的研究现状,包括它们的合成、波谱、结构和反应。     

支持向量机在云检测中的应用

针对地球观测系统/中分辨率成像光谱仪影像资料中的云检测工作,提出了基于支持向量机SVMs(support vector machines)的遥感影像分类方法.分析了云检测过程中的特征提取和选择,建立了基于支持向量机的遥感影像分类模型,并针对陆地、海洋2种不同的下垫面进行了云检测试验.云检测结果中,云与陆地、水体、积雪准确地区分开来.结果表明,特征选择对云检测起到了积极的作用,同时也证明了支持向量机方法在遥感影像分类中的优势.