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Search Results: 1 - 10 of 379696 matches for " br>朱志刚 "
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ANALYSIS AND TREATMENT OF A QUALITY PROBLEM OF COMPOSITE FOUNDATION OF CFG PILES FOR BUILDING 4 IN XIZHAOSI RESIDENTIAL AREA
北京夕照寺小区4#住宅楼CFG桩复合地基质量问题分析处理

ZHU Zhi-gang,<br>
岩石力学与工程学报 , 2005,
Abstract: Data obtained from composite foundation monitoring showed that the allowable bearing load of some cement flyash gravel(CFG) piles for building No.4 in Xizhaosi residential area did not meet the requirements of engineering design. After re-exploration and careful analysis,it was found that the sand soil under the bottom of the pile and around the pile was disturbed during the construction of CFG piles. This paper aims at reminding engineers and technicians of elaborate design and construction of CFG pile to ensure quality in composite foundation design and construction.
AN APPROACH TO ANALYZING NATURE OF COMMUNITY STRUCTURE: WITH EXAMPLES OF ALPINE MEADOW AND ALPINE BUSHLAND
群落结构特性的分析方法探讨——以高寒草甸和高寒灌丛为例

Zhu Zhi-hong,<br>,
植物生态学报 , 1996,
Abstract: 从种-多度关系和物种多样性对高寒草甸和高寒灌丛在不同放牧强度下群落结构特性的分析表明,种在群落中的相对重要性发生了变化,种相对多度的分布模式符合对数正态分布,并随放牧强度的变化显示出有规律的改变;同时,表示群落结构特性的指数(Simpson多样性指数λ、Shannon信息多样性指数H'、McIntosh多样性指数Dmo、均匀性指数E和物种丰富度指数R)值在各放牧强度群落间却未表现出统计学上的显著差异(P>0.05)。这表明在有些情况下单纯对物种多样性等指数值的比较并不一定能准确地反映出群落结构上的变化,同时也证实了West关于多样性指数值保持不变或近似但群落结构可能发生变化的推断。
Comparison of indentation-induced deformation and fracture of several kinds of semiconductor single crystals
几种单晶半导体材料在压痕下的变形与断裂行为比较

YAO Zhigang,ZHU Xiaofei,ZHANG Guangping,<br>尧,晓飞,张广平
材料研究学报 , 2009,
Abstract: Micro-indentation method was used to study deformation and fracture behavior of Si, Ge, GaAs, InP single crystals. In-plane microhardness, critical indentation size and fracture toughness of the 100] oriented crystals were measured to analyze anisotropic mechanical properties of these materials. The results show that under the indentation load, Si and Ge deformed through the formation of shear faults, while the activation of slip systems accommodated the deformation of GaAs and InP. The microhardness, elastic modulus and fracture toughness exhibit anisotropic at different extent. The relationship between crack length and indent size shows that the critical indent size and the linearly-fitted slope of the crack length vs. indent size of Si and Ge single crystals are smaller than that of GaAs and InP. The variations of the critical indent size and the linear slope are consistent with that of the hardness and fracture toughness.
An Indirect Hybrid Adaptive Pole Placement Scheme for Plant with Unmodeled Dynamics
一种对象具有未建模动态时的间接式混合自适应极点配置方案

Zhu Zhigang,Li Yanjun,Qiang Wenxin,<br>,李言俊,强文鑫
自动化学报 , 1993,
Abstract: In this paper, we propose an indirect hybrid adaptive pole placement scheme for plant with numodeled dynamics. Normalization technique and covariance reset least square method with forgetting factor are used for parameter estimation. We design the discrete adaptive control law directly from continuous plant, which guarantees the robust stability of the closed-loop system. Theoretical analysis and digital simulation results show that this scheme is superior to similar continuous scheme and discrete scheme.
Automatic Traffic Monitoring System Using ZD Spatio-temporal Images
自动交通监测系统的二维时空图象方法

Zhu Zhigang,Xu Guangyou,Yang Bo,<br>,杨波
中国图象图形学报 , 1996,
Abstract: Automatic traffic monitoring plays an important role in the truly Intelligent Vehicle/Highway System(IVHS). Vision-based approach is promising since it requires no pavement adjustments and has more potential advantages such as larger detection areas and more flexible functions. However traffic flow raises interesting but difficult problems for image processing. The various light conditions, as the result of variety of weather, places a strong need on the robust algorithms, which require a great amount of computational power to meet the real-time operations of the traffic monitoring system. Great research efforts have been put on this topic all over the world, but most of the current commercial traffic monitoring image systems are cost expensive.In this paper we present a novel approach using 2D spatio-temporal images. The TV camera is mounted above the highway. The traffic is monitored and analyzed through two slice windows for each lane the vehicle detection window is along the 2D spatio - temporal (ST) images: the panoramic view image (PVI) and the epipolar plane image (EPI). The primary problem, The separation and counting of vehicles and identifying their class(size) and speed,is solved through analyzing these two ZD ST images. The problem of camera settings, ST image calibration and rectification, data integration in vehicle detection, accurate speed estimation, background updating are discussed in the paper.The features and advantages of the proposed ST approach are: (1) Adaptive signal selection. Only the vital information which is enough for the given tasks is selected. (2) Computational efficiency. Only a few scan lines are processed in each frame, and ST images are more generic and simple than frame images in this special application. (3) Information completeness. Narrow spatial viewing windows are compensatedby dense temporal sequences, and the partially-viewed large vehicles in a single frame can be reconstructed by using ST images. (4)Accurate speed estimation. Speed is estimated from the loci of the front and rear instead of the locations at two single instants. (5) Easy background updating. Updating of the background estimation is very important in dealing with the changing weather conditions, which can be done easily according to the information from the few scan lines in the ST image method. (6) COmpact representation.PVI is a compressed and visually explicit representation for the traffic flow. So PVI can be saved on the hard disk and takes the place of the traditional video tapes. We have built up a prototype system using the methods presented in the paper.
Natural Environment Image Segmentation Based on The Fractal Characters
基于分形特征的自然景物图象分割方法

Yang Bo,Xu Guangyou,Zhu Zhigang,<br>杨波,
中国图象图形学报 , 1999,
Abstract: 提出了一种基于分形特征分割自然景物图象的方法。分割的主要目标是找出景物中的人造物体。首先构造了一组分形纹理特征,给出了图象不同部分的粗糙度及纹理基地大小、方向特性的描述,以此为基础进行图象分割。此外,通过对盒维数方法中的参数拟合性能的分析,对维数估计方法进行优化,理论和实验表明,在自然环境中,该方法能够区 的纹理区域及人造目标,达到满意的分割结果。
THE PROBABILITY AND STATISTIC METHOD AND ITS APPLICATION TO BRITTLE FRACTURE
脆性断裂的概率统计方法

FAN Shuqun,LI Yongchi,WANG Zhiliang,<br>范书群,李永池,
力学与实践 , 2007,
Abstract: In this paper,a probability and statistic equation for brittle fracture is proposed based on the concept of individual cumulative fracture probability.It is related to the defect density and the cumulative fracture probability,as well as the stresses.Some previous fracture probability and statistic equations are shown to be special cases of this equation and the defect density and the cumulative fracture probability play an important role.The number and the distribution of the fragments are obtained from the equation and the related probability and statistics.
Hierarchical responses to grazing defoliation in a clonal plant Kobresia humilis
克隆植物矮嵩草对放牧的等级性反应

ZHU Zhi-Hong,WANG Gang,WANG Xiao-An,<br>,,王孝安
生态学报 , 2006,
Abstract: 对高寒草甸克隆植物矮嵩草(Kobresio humilis)基株、分株片断和分株3个层次构件单元的数量、生物量性状及其变异系数在不同放牧强度处理间以及构件等级间的变化进行了研究。研究工作于1999年至2001年在中国科学院海北高寒草甸生态系统定位站矮嵩草草甸内进行。家畜放牧实验设4个放牧强度水平。研究结果显示,3a中矮嵩草克隆等级基株层次只有分株数和叶数在放牧处理间表现出显著差异(F(3.56)〉F0.05,P〈0.05),而死亡分株百分数、死亡叶片百分数、基株大小以及繁殖分配4个性状在3a中未表现出显著差异(F(3.56)〈F0.05,P〉0.05),占被测性状的57.1%;与此同时,分株片断和分株两个层次在第1年就有50%以上的性状达到显著差异,到第3年时全部被测性状都表现出显著差异(F(3.56)〉F0.05,P〈0.05)。放牧第3年时,基株、分株片断和分株层次达到显著差异的性状数分别为42%、100%和100%。性状的变异系数在等级间的变化均表现为分株〉分株片断〉基株层次或分株〉分株片断的顺序。被测性状的变异系数在放牧强度间无显著差异,在放牧第1、第2和第3年,变异系数在等级间有显著差异的性状比例分别为42%、71%和85%。这说明克隆植物矮嵩草基株、分株片断和分株各层次被测性状在放牧强度处理问表现出的差异性不同,具有显著差异的性状比例在基株层次少,在分株片断和分株层次高,相同性状在处理间的差异可能先出现在分株和分株片断层次,后出现在基株层次。放牧强度不影响性状的相对变异,但长期持续的放牧扰动使性状在等级间变异性逐渐增大。这些结果说明矮嵩草构件等级对放牧扰动具有明显的等级性反应,并可概括为“分株层次〉分株片断层次〉基株层次”的等级反应模式。研究结果证实我们关于克隆植物等级选择模式的推断。
OIL MIGRATION DIRECTION OF DALUHU OILFIELD IN DONGYIN DEPRESSION
根据原油的含氮化合物判断东营凹陷大芦湖油田油气运移方向

ZHENG You-heng,<br>郑有恒,黄海平,,陈永峤,建辉
天然气地球科学 , 2004,
Abstract: Pyrrolic nitrogen compounds are used as tracers for investigating oil migration of Daluhu oilfield in Dongyin depression. The results of analyses on some prarmeters of pyrrolic nitrogen compounds in oils indicate that migration effects are obvious. It is suggested that oils likely move from north to south.
Surface shape control of the workpiece in a double-spindle triple-workstation wafer grinder
双主轴三工位硅片磨床的工件磨削面型控制的研究

Zhu Xianglong,Kang Renke,Dong Zhigang,Feng Guang,<br>祥龙,康仁科,,冯光
半导体学报 , 2011,
Abstract: 双主轴三工位(DSTW)超精密磨床主要应用于集成电路制造生产线中大直径(≥300mm)硅片的前道制备和背面减薄加工。通过调整DSTW磨床的主轴和工作台的倾角控制磨后的硅片面型的研究很重要,但尚未充分研究。本文分析了DSTW硅片磨床的砂轮主轴和工作台倾斜角度调整的要求。 提出了DSTW硅片磨床对砂轮主轴和工作台的合理配置方案。在此基础上,提出了DSTW硅片磨床的砂轮主轴和工作台倾角调整的方法。推导出粗磨轴和精磨轴的硅片面型与倾角调整量关系的数学模型。提出的磨床倾角配置方案和调整方法将给予DSTW晶圆磨床设计提供参考指导。
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