一种二维三温辐射热传导方程组SFVEM格式的并行预条件子

在三角形剖分下,针对二维三温辐射热传导方程组的SFVEM离散系统,设计了一类基于块对角逆的预条件,给出了条件数的理论估计式.在此基础上,设计了相应的PCG算法.数值实验验证了理论结果的正确性.     

In-vitro assessments of micro arc oxidized ceramic films on AZ31 magnesium implant : Degradation and cell-surface response

In this research,phosphate and silicate based ceramic flms were synthesized via micro arc oxidation(MAO) method on the surface of the magnesium alloy.With the aim of orthopedic application of these coatings,corrosion behavior of them was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy in simulated body fuid(SBF) environment.The results indicated better corrosion resistance of the phosphate flm compared to the silicate flm.Moreover,based on immersion tests,less pH and weight changes were obtained for the phosphate coating.Osteosarchoma(G292) Cell response of the coated specimens showed better cell morphology on the surface of the phosphate flm than silicate flm after 6 and 24 h of culture.This was related to the more surface roughness and less degradation rate of the phosphate flm compared with silicate coating.     

准噶尔盆地重32井区齐古组油藏主控因素

 在分析地层、构造、沉积、储层及流体特征基础上,从不整合和断裂两方面对准噶尔盆地重32井区齐古组油藏主控因素进行分析。结果表明：齐古组油藏类型为发育在不整合半风化岩石带内的浅层地层-断块型超稠油油藏,成藏模式为侏罗纪末—白垩纪源外-不整合-断控次生油气藏成藏;不整合-断裂是油气运聚的主要运聚体系;白垩系/侏罗系不整合风化黏土层普遍发育,但其封盖能力差,是稠油形成的重要原因;多期构造运动及断裂-不整合复合输导体系是研究区齐古组稠油油藏形成的主控因素。     

Liver esterase abnormalities in hereditary neurological diseases of mice

Zusammenfassung Alle von uns in Mäusen untersuchten vererblichen neurologischen Erkrankungen stellen entweder primäre oder sekundäre gesamtkörperliche Prozesse dar. Verschiedene allelische Substitutionen produzieren spezifische Leber-Esterase-Isozym-Defekte.

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This work was supported in part by NIH research grant No. NB 06448 from the National Institute of Neurological Diseases nad Stroke, a grant from the National Foundation for Neuromuscular Diseases, Inc., a grant from the Health Research Fund, United Fund of Schenectedy County, Inc., and an allocation from NIH General Research Support Grant No. RR 05545 from the Division of Research Resources to The Jackson Laboratory.

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The principles of laboratory animal care as promulgated by the National Society for Medical Research are observed in this Laboratory.     

基于GPU的大规模基因片段并行匹配的方法

后缀树和后缀数组广泛用于生物信息学领域中,特别是通过启发式算法在对DNA基因片段进行匹配的阶段.本文提出了在GPU的平台下,利用多核和超多核体系构成的后缀树以及后缀数组并行匹配大规模基因片段,从而加速基因搜索匹配过程.相对于后缀树,后缀数组二分搜素算法具有内存占用少,缓存使用率高等优点.在GPU的性能评估中,后缀数组执行效率明显超过后缀树,后缀数组占用的空间仅为后缀树的20%~30%.相对于CPU的串行实现,后缀树组达到了约99倍的加速比.实验结果表明在基因片段匹配的过程中,基于GPU的后缀数组二分搜索是一种高效且实用的方法.     

一种面向域的高效倒排索引结构及实时更新

倒排索引是搜索引擎的核心组成部分,对搜索的效率与质量有着较大的影响.在一些主题搜索引擎中,关键词被划分为多个域以提高检索质量,针对这种特点,本文提出了一种新的面向域的高效倒排索引结构,以及实时更新倒排索引的算法.实验结果表明,在每个域内索引词项个数接近词典大小的情况下,本文提出的倒排索引结构可以有效地提高搜索引擎的检索效率.     

Rough law energy and measurement of ■-decomposition rough law

By employing function one-direction S-rough sets and rough law generation method based on function S-rough sets, ■-decomposition law and ■-decomposition rough law are proposed, and the measurement of rough law variation in the process of rough law ■-decomposition is researched. The concepts of law energy and attribute ■-interference degree are presented, which make the variation of rough law become measurable. ■-decomposition law energy characteristic theorem, ■-decomposition law energy inequality theorem,■...     

Fault detection filter design for linear discrete time-varying systems with multiplicative noise

The problem of fault detection for linear discrete timevarying systems with multiplicative noise is dealt with.By using an observer-based robust fault detection filter(FDF) as a residual generator,the design of the FDF is formulated in the framework of H ∞ filtering for a class of stochastic time-varying systems.A sufficient condition for the existence of the FDF is derived in terms of a Riccati equation.The determination of the parameter matrices of the filter is converted into a quadratic optimization problem,and an analytical solution of the parameter matrices is obtained by solving the Riccati equation.Numerical examples are given to illustrate the effectiveness of the proposed method.     

油气场站自动化巡检机器人系统设计

油气场站存储的物质由于具有可燃性,需要高频率的进行巡检。针对油气场站分布较广,占用面积较大,人工巡检费时费力,需要携带各种传感器进行采集与分析数据的问题,设计了一套油气场站自动化巡检机器人系统。该巡检系统包括自主移动平台、底层控制及传感器、自主导航算法、传感器检测算法、数据处理与预警平台。通过设计的被动式底盘和自主导航算法,该系统能够在油气场站的非结构化路面上进行快速巡检;通过设计的传感器检测及处理预警平台,该系统能够对油气场站的甲烷等易燃气体进行自主分析并数据回传,使得检测流程更加简洁高效。经实验测试,本油气场站全自动化巡检机器人系统能够完成灵活的越过各种障碍物,在危险环境下进行巡检,自主建立环境地图并导航,环境异常检测并回传数据,数据分析并报警等复杂任务,能够广泛的运用在油气场站的自动化巡检任务中。     

Hamilton半群的自同态半群

 Hamilton半群是一种重要的代数结构。针对Hamilton半群的特点,利用其半群性质和图论结果对其自同态的结构进行了研究。首先定义了其自同态的一种乘法运算,并证明了Hamilton半群的自同态也构成一个Hamilton半群。其次,在引入半序关系之后,给出了Hamilton半群的自同态半群的一个图论表示,即关于半序关系的覆盖图是有向森林。