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Search Results: 1 - 10 of 23361 matches for " SHI Anchi "
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Characteristics and Mechanism of Deformation of High Rock Solpe of the Three Gorges Project Shiplock
三峡工程永久船闸高边坡岩体变形特征与机理分析

Shi Anchi,Zhao Minghua,Xue Guofu,
石安池
,赵明华,薛果夫

岩石力学与工程学报 , 2001,
Abstract: The deformation monitoring results of high rock slope of the Three Gorges Project shiplock show that the deformation of rock mass which is identified as 3 different zones obviously is mainly caused by excavation and unloading of ground stress. The deformation of the fresh and slightly weathered rock mass is achieved by the opening of joints, which causes the cracking of surface concrete and shotcret. The range and process of the rock mass deformation are related to the geological conditions, blasting, and cable anchoring.
REINFORCEMENT EFFECT ANALYSIS AND GLOBAL SAFETY EVALUATION OF ARCH DAM AND ABUTMENT OF BAIHETAN HYDROPOWER STATION
白鹤滩水电站拱坝及坝肩加固效果分析及整体 安全度评价

NING YU,XU Weiya,ZHENG Wentang,SHI Anchi,WU Guanye,
宁 宇
,徐卫亚,郑文棠,石安池,吴关叶

岩石力学与工程学报 , 2008,
Abstract: 白鹤滩水电站拱坝左侧坝肩断层及层间、层内错动带发育,拱推力作用下易发生剪切变形.坝基柱状节理层发育,变形模量等力学指标相对较低,表现出显著的各向异性力学特性.由于以上地质缺陷的影响,设计采取沿拱推力方向设置抗剪洞及扩挖坝基处柱状节理层岩体设置垫座的工程处理措施,以期对坝肩、坝基岩体的抗剪、传力等进行改善.采用三维非线性数值分析方法,根据实际地质信息建立三维数值模型,模拟白鹤滩中坝址主要地质现象及相关工程措施,通过坝肩、坝基岩体及坝体的应力、位移对比,定量分析主要地质缺陷的影响以及工程处理措施的效果.采用超载法、强度折减法及点安全系数法评价下坝线拱坝的安全度,为该水电站坝线比选提供技术依据和科研成果支撑.
EXPLANATION AND APPLICATION OF DATA OBTAINED IN DEFORMATION TEST OF CENTRAL HOLE
中心孔变形试验资料的解释与应用

ZHANG Yihu,SHI Anchi,ZHOU Huoming,ZHONG Zuowu,XIONG Shihu,
张宜虎
,石安池,周火明,钟作武,熊诗湖

岩石力学与工程学报 , 2008,
Abstract: 现场岩体变形试验时,试验点部位岩体由于受卸荷、松弛影响,表层岩体变形性能与深部未扰动岩体变形性能存在差异.由表面测点变形计算出的岩体变形参数,反映的是包含松动圈在内的整个岩体的综合变形性能,而不是未扰动岩体变形性能.中心孔变形试验能采集深部岩体变形,为研究未扰动岩体变形参数创造可能.由于介质条件和荷载作用过程的复杂性,中心孔变形试验资料应如何合理解释及应用,仍然是困扰广大试验研究人员的难题.综合采用理论分析和数值模拟手段,就此问题展开深入研究,研究结果表明:将深部未扰动岩体变形代入规程中有关公式,计算出的变形参数能准确反映未扰动岩体的变形性能.建议在现场试验时,首先通过声波测试大致确定松动圈厚度,然后将深部测点尽量布设在未扰动岩体内,同时在试验点表面布置测点;数据处理时,先将深部测点数据代入解析公式计算未扰动岩体变形参数,然后再依据表面测点变形和已计算出的未扰动岩体参数,通过数值模拟反算松动圈内岩体变形参数.
3D GEOLOGICAL VISUALIZATION AND NUMERICAL MODELING OF COMPLICATED SLOPE
复杂边坡三维地质可视化和数值模型构建

ZHENG Wentang,XU Weiya,TONG Fuguo,SHI Anchi,
郑文棠
,徐卫亚,童富果,石安池

岩石力学与工程学报 , 2007,
Abstract: The construction of the 3D visualization model and the numerical model of rock slope is critical in geotechnical,hydroelectric and hydropower projects. The 3D visualization model not only illustrates the spatial combination of structural plane in slope,but also discloses the macroscopic failure mode of slope. The combination and transition between the visualization model and the numerical model can indicate the simulation and dynamic modification of geological information. Based on AutoCAD platform,AutoLisp program and interpolation method of MLSM are used to generate the 3D visualization model. Moreover,the interface to the numerical model is discussed. This technique well combines the excellent graphic manipulation of AutoCAD and the general numerical softwares FLAC3D and 3DEC of ITASCA Ltd.. Besides,the model can adapt the technique to change the geological information. Combined with the discrete element method for deformable bodies,the technique has been well applied to the water intake high slope in Baihetan Hydropower Station. FISH program in 3DEC and AutoLISP program in AutoCAD are combined to improve the functions of preprocessing and post processing of 3DEC. The anchorage method in 3DEC,visualization of contour chart and nephogram of 3D displacement and plastic zone are discussed.
STUDY OF RANDOM SIMULATION OF COLUMNAR JOINTED ROCK MASS AND ITS REPRESENTATIVE ELEMENTARY VOLUME SCALE
柱状节理岩体随机模拟及其表征单元体尺度研究

NING YU,XU Weiya,ZHENG Wentang,MENG Guotao,SHI Anchi,WU Guanye,
宁 宇
,徐卫亚,郑文棠,孟国涛,石安池,吴关叶

岩石力学与工程学报 , 2008,
Abstract: 柱状节理岩体地质成因特殊,地质结构特点与常见岩体有很大不同,成规则或不规则柱状排列,其裂隙统计及节理的随机模拟方法也与常见岩体采用的方法不尽相同.根据白鹤滩水电站柱状节理岩体的地质构造特点及现场统计资料,以其中最为常见的一类柱状节理为例,引入Voronoi方法对其进行随机模拟,并将随机模型导入3DEC,生成三维随机柱状节理模型进行数值试验,得出其表征单元体(REV)尺度约为典型节理迹长的3~4倍.同时数值试验结果表明,平行于柱轴向(y方向)与垂直于柱轴向(x-z方向)的弹性模量及泊松比值相差较大,柱状节理显示有强烈的各向异性.x-z方向弹性模量及泊松比值相差较小,在REV尺度下可近似认为x-z方向材料性质相同,将柱状节理视为横观各向同性体进行计算和分析.
An Integrated Micro- and Macroarchitectural Analysis of the Drosophila Brain by Computer-Assisted Serial Section Electron Microscopy
Albert Cardona,Stephan Saalfeld,Stephan Preibisch,Benjamin Schmid,Anchi Cheng,Jim Pulokas,Pavel Tomancak,Volker Hartenstein
PLOS Biology , 2012, DOI: 10.1371/journal.pbio.1000502
Abstract: The analysis of microcircuitry (the connectivity at the level of individual neuronal processes and synapses), which is indispensable for our understanding of brain function, is based on serial transmission electron microscopy (TEM) or one of its modern variants. Due to technical limitations, most previous studies that used serial TEM recorded relatively small stacks of individual neurons. As a result, our knowledge of microcircuitry in any nervous system is very limited. We applied the software package TrakEM2 to reconstruct neuronal microcircuitry from TEM sections of a small brain, the early larval brain of Drosophila melanogaster. TrakEM2 enables us to embed the analysis of the TEM image volumes at the microcircuit level into a light microscopically derived neuro-anatomical framework, by registering confocal stacks containing sparsely labeled neural structures with the TEM image volume. We imaged two sets of serial TEM sections of the Drosophila first instar larval brain neuropile and one ventral nerve cord segment, and here report our first results pertaining to Drosophila brain microcircuitry. Terminal neurites fall into a small number of generic classes termed globular, varicose, axiform, and dendritiform. Globular and varicose neurites have large diameter segments that carry almost exclusively presynaptic sites. Dendritiform neurites are thin, highly branched processes that are almost exclusively postsynaptic. Due to the high branching density of dendritiform fibers and the fact that synapses are polyadic, neurites are highly interconnected even within small neuropile volumes. We describe the network motifs most frequently encountered in the Drosophila neuropile. Our study introduces an approach towards a comprehensive anatomical reconstruction of neuronal microcircuitry and delivers microcircuitry comparisons between vertebrate and insect neuropile.
An Integrated Micro- and Macroarchitectural Analysis of the Drosophila Brain by Computer-Assisted Serial Section Electron Microscopy
Albert Cardona,Stephan Saalfeld,Stephan Preibisch,Benjamin Schmid,Anchi Cheng,Jim Pulokas,Pavel Tomancak,Volker Hartenstein
PLOS Biology , 2010, DOI: 10.1371/journal.pbio.1000502
Abstract: The analysis of microcircuitry (the connectivity at the level of individual neuronal processes and synapses), which is indispensable for our understanding of brain function, is based on serial transmission electron microscopy (TEM) or one of its modern variants. Due to technical limitations, most previous studies that used serial TEM recorded relatively small stacks of individual neurons. As a result, our knowledge of microcircuitry in any nervous system is very limited. We applied the software package TrakEM2 to reconstruct neuronal microcircuitry from TEM sections of a small brain, the early larval brain of Drosophila melanogaster. TrakEM2 enables us to embed the analysis of the TEM image volumes at the microcircuit level into a light microscopically derived neuro-anatomical framework, by registering confocal stacks containing sparsely labeled neural structures with the TEM image volume. We imaged two sets of serial TEM sections of the Drosophila first instar larval brain neuropile and one ventral nerve cord segment, and here report our first results pertaining to Drosophila brain microcircuitry. Terminal neurites fall into a small number of generic classes termed globular, varicose, axiform, and dendritiform. Globular and varicose neurites have large diameter segments that carry almost exclusively presynaptic sites. Dendritiform neurites are thin, highly branched processes that are almost exclusively postsynaptic. Due to the high branching density of dendritiform fibers and the fact that synapses are polyadic, neurites are highly interconnected even within small neuropile volumes. We describe the network motifs most frequently encountered in the Drosophila neuropile. Our study introduces an approach towards a comprehensive anatomical reconstruction of neuronal microcircuitry and delivers microcircuitry comparisons between vertebrate and insect neuropile.
A High Efficiency Spread Spectrum Scheme Using Approximate Orthogonal Complex Sequences  [PDF]
Xiaohong SHI
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2010, DOI: 10.4236/ijcns.2010.31011
Abstract: This paper presents a high efficiency spread spectrum scheme using approximate orthogonal complex (AOC) sequences. In this scheme, the 64 AOC sequences picked up from 84 complex sequences space are employed for spreading spectrum. In modulation, 6 input bits is used to select one AOC sequence, and the selected sequence is then phase-rotated by another 2 input bits. In demodulator, a complex correlator detects the transmitted AOC sequence. Simulation results show that the proposed scheme has better BER performance than the existing complementary code keying (CCK) modulation scheme. For AOC, additional processing gain of 1.79dB can be obtained when the sequence length is 8.
Foundations of Intelligence Science  [PDF]
Zhongzhi Shi
International Journal of Intelligence Science (IJIS) , 2011, DOI: 10.4236/ijis.2011.11002
Abstract: In order to make significant progress toward achievement of human level machine intelligence a paradigm shift is needed. More specifically, the natural intelligence and artificial intelligence should be closely interacted in Intelligence Science study, instead of separate from each other. In order to reach the paradigm, brain science, cognitive science, artificial intelligence and others should cross-research together. Brain science explores the essence of brain, research on the principle and model of natural intelligence in molecular, cell and behavior level. Cognitive science studies human mental activity, such as perception, learning, memory, thinking, consciousness etc. Artificial intelligence attempts simulation, extension and expansion of human intelligence using artificial methodology and technology. All together pursue to explore the mechanism and principle of intelligence which is the engine of advanced science and technology. The paper will give the definition of intelligence and discuss ten big issues of Intelligence Science. The conclusion and perspective will be given in last section.
Numerical Study of Initial Soil Moisture Impacts on Regional Surface Climate  [PDF]
Xueli Shi
Atmospheric and Climate Sciences (ACS) , 2011, DOI: 10.4236/acs.2011.14019
Abstract: In this paper, the impacts of initial soil moisture (SM) over the Huaihe River Basin of China on the summertime climate have been investigated with a regional climate model. Three fourth-month-long simulations are made for two summers, the abnormal flooding in 2003 and normal climate in 2004. Besides control simulations (noted as CTL), sensitivity experiments have been conducted by assigning the initial soil moisture equals to 50% and 150% of the simulated soil moisture while keeping the others unchanged, which are noted as SM50 and SM150, respectively.The results show that effects of initial SM anomalies at late spring can last for the whole summer, and the increase of initial soil moisture (SM150) has more significant effects than the decreased one (SM50). The differences between sensitivity experiments and CTL mainly appear at surface and near-surface atmosphere. When increasing the initial SM, the latent heat flux and surface soil moisture are increased, correspondingly the sensible heat flux, temperature and radiation are all decreased. The changes of rainfall are not distinct between SM50 and SM150, which might be related to the processes within atmosphere, especially the humidity pattern.
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