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An Energy Gradient Fracture Criterion Based on Virtual Crack Vector Model with Application to T-Stress Problem

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An Energy Gradient Fracture Criterion Based on Virtual Crack...

中国科学院地质与地球物理研究所2004学术年会

作者： D.A Liu~1,L.Y.Li~2 Q.F.Yuan~3 and D.X.Cheng~1 1 Key Laboratory of Engineering Geomechanics,Institute of Geology and Geophysics, chinese academy of sciences,beijing 100029,P.R.china 2 china university of Mining and Technology(beijing Campus),beijing 100083,P.R.china 3 university of Science and Technology beijing,beijing 100083 P.R.china

A virtual crack vector model is proposed in this paper to simulate the branched crack propagation and simplify its calculation of energy release *** energy gradient fracture criterion is constructed based on this *** can take account of the effects of biaxial loads or T-stress on brittle mixed mode fracture and agrees well with the test data of biaxial tensile fracture and the specially conducted experiment of the influences ofσ on the mixed mode fracture of *** its advantage of predicting initial propagation angle and critical fracture stress independently without the determination of the core region radius,it can be used as a practical fracture criterion for brittle mixed mode fracture under biaxial tension.

关键词： Fracture criterion Energy release rate Energy gradient Virtual crack vector Biaxial Loading experiment T-stress Branched crack propagation

DRAV model and its application in assessing groundwater vulnerability in arid area:a case study of pore phreatic water in Tarim Basin,Xinjiang,Northwest china

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DRAV model and its application in assessing groundwater vuln...

中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： Jinlong Zhou·Guomin Li·Feng Liu·Yiping Wang·Xiaojing Guo Institute of Geology and Geophysics, chinese academy of sciences,100029 beijing,china College of Water Conservancy and Civil Engineering, Xinjiang Agricultural university,830052 Urumqi,china School of Environmental Science,china university of Geosciences,430074 Wuhan,china

According to the characteristics of groundwater in arid area,this paper proposes DRAV model for groundwater vulnerability assessment,where D is groundwater depth,R is the net recharge of aquifer,A is the aquifer characteristics,and V is the lithology of vadose *** a case study,the paper assesses the vulnerability of pore phreatic water in Tarim Basin of Xinjiang,china by using the DRAV *** results indicate that the areas of phreatic water with vulnerability index ranges of 2-4,4-6,6-8 and>8 accounting for 10.1,80.4,9.2 and 0.2%of the total plain area of the Tarim Basin respectively, and the areas with the latter two vulnerability ranges (6-8 and>8)are mainly located in the irrigation districts with thin soil layer(20-30 cm thick surface soil of vadose zone,mainly with underlying sandy gravel)and with silty and fine sand *** vadose zone generally lacks sandy loam and clayey soil and has larger recharge by infiltration of irrigation water.

关键词： Groundwater Vulnerability DRAV model Tarim Basin

Progressive transformation of immortalized esophageal epithelial cells

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World Journal of Gastroenterology 2002年第6期8卷 976-981页

作者： Zhong-Ying Shen Li-Yan Xu Min-Hua Chen Jian Shen WeiJia Cai,Department of Tumor Pathology Medical College of Shantou university,Shantou 515031,Guangdong Province,china Yi Zeng,Institute of Virology,chinese academy of Preventive Medicine.beijing 100052,china Department of Tumor Pathology Medical College of Shantou University Guandong Province China. zhongyingshen@***

AIM: To investigate the progressive transformation of immortal cells of human fetal esophageal epithelium induced by human papillomavirus, and to examine biological criteria of sequential passage of cells, including cellular phenotype, proliferative rate, telomerase, chromosome and ***: The SHEE cell series consisted of immortalized embryonic esophageal epithelium which was in malignant transformation when cultivated over sixty passages without co-carcinogens. Cells of the 10th, 31st, 60th and 85th passages were present in progressive development after being transfected with HPV. Cells were cultivated in a culture flask and 24-hole cultural plates. Progressive changes of morphology, cell growth, contact-inhibition, and anchoragedependent growth characteristics were examined by phase contrast microscopy. The cell proliferation rate was assayed by flow cytometry. The modal number of chromosomes was analyzed. HPV18E6E7 was detected by Western blot methods and activities of telomerase were analyzed by *** of cells was detected with soft agar plates cultivated and with tumor formation in SCID ***: In morphological examination the 10th passage cells were in good differentiation, the 60th and 85th passages cells were in relatively poor differentiation, and the 31st passage cells had two distinct differentiations. The characteristics of the 85th and 60th passage cells were weakened at contact-inhibition and anchorage-dependent growth. Karyotypes of four stages of cells belonged to hyperdiploid or hypotriploid, and bimodal distribution of chromosomes appeared in the 31st and 60th passage cells. All of these characteristics combined with a increasing trend. The activities of telomerase were expressed in the latter three passages. Four fourths of SCID mice in the 85th passage cells and one fourth of SCID mice in the 60th passage cells developed tumors, but the cells in the 10th and 31st passage displayed no tumor ***

关键词：人胚食管上皮细胞进行性转化细胞遗传学变化端粒酶肿瘤发生

Experimental Analysis and Evaluation for Bacteria in microbial enhanced oil recovery

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Experimental Analysis and Evaluation for Bacteria in microbi...

2010 3rd International Conference on Future BioMedical Information Engineering (FBIE 2010)

作者： Xiu Jianlong and Yu Li Institute of Porous Flow & Fluid Mechanics Research Institute of Petroleum exploitation and development graduate university of chinese academy of sciences china National Petroleum Company Langfang, Hebei 065007,china Sui Ningbo Xianhe Oil Recovery Plant Shengli oil Field, SINOPEC, Dongying Shandong 257061,china

The experimental analysis and evaluation of Bacteria （CY2, CQ2, LC and JH） from Research Institute of Huabei oilfield were conducted according to Ba51 Unit and fluids properties. The metabolism, emulsification and reduction of oil viscosity by the four bacteria were analyzed. Our study showed that CY2 has little effect on oil while CQ2 can produce gases during the cultivation. The bio-surfactants produced by LC and JH can decrease the interfacial tension and viscosity of oil. The study of physical simulation showed that LC and JH have a significant effect on enhancing oil recovery, and the data of physical simulation were identical to the experimental results of emulsification and reduction viscosity. In sand package physical simulation experiments, residual oil recovery was employed to reduce the errors for experimental evaluation. The Study suggests that strain LC and JH have a potential application in Ba51 Unit.

关键词： Evaluation of bacteria physical simulation enhanced oil recovery residual oil recovery.

THEORETICAL　STUDIES　ON　THE　CYCLOADDITION　REACTION　OF　FLUOROKETENE　WITH　ETHYLIDENIMINE

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chinese Chemical Letters 1995年第4期6卷 311-314页

作者： Zhen Feng XU De Cai FANG Xiao Yuan FU(Department of Chemistry, beijing Normal university, beijing, 100875) beijing Normal Univ Dept Chem Beijing 100875 Peoples R China

The stereospecific rule of the cycloaddition reaction of ketene and imine has been treated theoretically in this Paper. By comparing the barrier heights, it can be seen that for trans imine the reaction will give cis ... 详细信息

关键词：颍

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辽宁绒山羊杂交改良子午岭黑山羊的效果及遗传分析

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畜牧兽医学报 1992年第1期23卷 39-43页

作者：马月辉蒋英中国农业科学院畜牧研究所北京农业大学畜牧系

本文对用辽宁绒山羊杂交改良子午岭山羊的生长发育、生产性能、绒纤维品质及遗传规律进行了分析,结果表明各代杂种羊的各个指标均较子午岭山羊有提高。杂种羊体重比子午岭山羊体重提高10％以上,子午岭成年母羊产绒量为115克,杂种一、二... 详细信息

本文对用辽宁绒山羊杂交改良子午岭山羊的生长发育、生产性能、绒纤维品质及遗传规律进行了分析,结果表明各代杂种羊的各个指标均较子午岭山羊有提高。杂种羊体重比子午岭山羊体重提高10％以上,子午岭成年母羊产绒量为115克,杂种一、二、三代分别为282、330、355克,产绒量显著提高(P62、0.138、0.455。产绒量与体重、绒纤维的长度的遗传相关分别为0.674、0.882。绒纤维细度与体重的遗传相关为-0.086。根据估测的遗传参数,结合生产实际,提出选择指数I_8=-0.00425x_1+0.1898x_2+0.8785x_3,其中x_1=产绒量(克);x_2=体重(千克);x_3=细度(微米),可在生产中试用。

关键词：绒山羊绒纤维遗传参数山羊

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Reflective Fourier CGH with 16 phase levels

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chinese Journal of Lasers 1992年第5期 53-57页

作者： Pin Long, Dahsiung Hsu (Applied Physics Department, beijing university of Posts & Telecommunications,beijing 100088, china)Minxian Wu, Kuofan Chin(Dept. Precise Instruments, Tsinghua university,beijing 1000084, china)Shiping Gao (Microelectronic Research Center,china Science academy)

This paper reports design and fabrication of reflective Fourier computer generat-ed hologram(CGH) with 16 phase *** CGH converts a single beam to a 5×5 *** measured diffraction efficiency is 76.16％. The size of the ... 详细信息

关键词： computer generated hologram array generator optimization simulated annealing

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百色盆地浅层气成藏机制分析

天然气工业 2004年第11期24卷 11-14页

作者：黄绍甫朱扬明中国地质大学研究生院浙江大学理学院地球科学系

百色盆地是一个典型的陆相第三系残留型盆地。浅层气的分布,在盆地东部坳陷围绕生烃中心呈环带状分布,区带上沿主干断裂呈珠状出现;在盆地西部主要分布在南斜坡的江泽地区并沿断层呈带状分布。含气层位主要是始新统百岗组和渐新统伏平组... 详细信息

百色盆地是一个典型的陆相第三系残留型盆地。浅层气的分布,在盆地东部坳陷围绕生烃中心呈环带状分布,区带上沿主干断裂呈珠状出现;在盆地西部主要分布在南斜坡的江泽地区并沿断层呈带状分布。含气层位主要是始新统百岗组和渐新统伏平组,次为始新统那读组,埋深一般小于1500 m,大部分气层埋深在300-700 m之间。浅层气在地球化学特征上大多数呈现为甲烷含量高(超过95％,干气)、甲烷碳同位素组成轻(-55‰^-70‰)典型的生物气特征,其成因类型可划分为生物气、生物气-热解气及油层菌解气三类。其成藏机制与烃源岩的早、晚两期生物气的形成作用有关(成岩作用早期和构造运动抬升后的晚期),并以晚期复合成藏为主。

关键词：百色盆地浅层气成藏机制生物气主干断裂气层坳陷生烃油层区带

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Thermodynamic calculation and modeling of the CH4-H2O fluid inclusions

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Thermodynamic calculation and modeling of the CH4-H2O fluid ...

中国矿物岩石地球化学学会第13届学术年会

作者： MAO Shi-de~1,DUAN Zhen-hao~2 1.State Key Laboratory of Geological Processes and Mineral Resources,and School of Earth sciences and Resources,china university of Geosciences,beijing,100083,china 2.Key Laboratory of the Earth’s Deep Interior,Institute of Geology and Geophysics,chinese academy of sciences,beijing 100029, china

This work reports in detail the application of thermodynamic models or equations of state to the CH-HO fluid inclusions.A general method is presented to calculate the compositions of the CH-HO inclusions using the volume fractions and the dissolution temperatures of CH *** calculate the homogenization pressures and isolines of the CH-HO inclusions,an improved activity-fugacity model is developed to predict the vapor-liquid phase *** phase equilibrium model can predict methane solubility in liquid phase and water content in vapor phase from 273 K to 623 K and from 1 bar to 1000 bar(up to 2000 bar for the liquid phase),within or close to experimental *** to a lot of reliable experimental phase equilibrium data,an average deviation of the water content in the vapor phase and methane solubility in the liquid phase is 4.29%and 3.63%,

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