检索结果-南通市图书馆

The deformation pattern and fault rate in the Tianshan Mountains inferred from GPS observations

science china Earth sciences 2008年第8期51卷 1064-1080页

作者： yang shaomin1,2, li jie1,3.& wang qi2,1 1 research center of space science and technology, china university of geosciences, wuhan 43.074, china 2 Institute of Seismology, china Earthquake Administration, wuhan 430071, china 3 Earthquake Administration of Xinjiang Uygur Autonomous Region, Urumqi 830011, china research center of space science and technology China University of Geosciences Wuhan China Institute of Seismology China Earthquake Administration Wuhan China Earthquake Administration of Xinjiang Uygur Autonomous Region Urumqi China

Based on GPS measurements conducted from 1992 to 2006, we present the current crustal movement velocity field for approximately 400 sites in the Tianshan Mountains and their adjacent areas, and estimate slip rates on the major faults using a 2-D elastic dislocation model. Our studies show slip rates within the range of 1―4 mm/a on the NW-SE trending strike-slip faults (such as Talas-Fergana fault) in the Tianshan Mountains. We also found the slip rates on the approximately WE-SN trending gently-dipping detachment fault vary from 10―13 mm/a for the southwest Tianshan Mountains to 2―5 mm/a for the eastern Tianshan Mountains, and to 6―12 mm/a for the Kyrgrz Tianshan. The GPS velocity field reveals that the total convergence is not uniformly distributed across the Tianshan Mountains, with 80%―90% of the N-S shortening absorbed along the southern and northern edges, and relatively little deformation accommodated within the interior. This first-order feature of strain pattern is explained best by underthrusting of adjacent blocks beneath the Tianshan Mountains along a basal detachment fault. We found the occurrence of historical M7―8 earthquakes somewhere in the locked ramp that connects the creeping and locking segments of the detachment, thereby resulting in elastic strain concentration and accumulation around it. The elastic strain confined in the upper crustal layer above the detachment ultimately releases through infrequent great earthquakes in the Tianshan Mountains, resulting in considerable folding and faulting at their margins. The Tianshan Mountains propagated outward and rose progressively as a wedge-shaped block.

关键词： Tianshan Mountains GPS slip rates tectonic deformation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Sm-Nd and zircon SHRIMP U-Pb dating of Huilanshan mafic granulite in the Dabie Mountains and its zircon trace element geochemistry

引用

science china Earth sciences 2005年第12期48卷 2081-2091页

作者： HOU Zhenhui1, li Shuguang1, CHEN Nengsong2, li qiuli1 & liU Xiaoming3 1. School of Earth and space sciences, university of science and technology of china, Hefei 230026, china 2. The Key Laboratory of Continental Dynamics of the Ministry of Education, Northwest university, Xi’an 710069, china 3. Faculty of Earth sciences, china university of geosciences, wuhan 43.074, china School of Earth and space sciences University of Science and Technology of China Hefei China The Key Laboratory of Continental Dynamics of the Ministry of Education Northwest University Xi’an China Faculty of Earth sciences China University of Geosciences Wuhan China

The mafic granulites from Huilanshan are outcropped on the center of the Luotian dome in the northern Dabie Mountains. The Sm-Nd isochron defined by granulite-facies meta-morphic minerals (garnet + clinopyroxene + hypersthene) yields an age of 136 ± 18 Ma indicating the early Cretaceous granulite-facies metamorphism. The cathodoluminescence (CL) images of zircons from the granulite show clearly core-mantle-rim structures. The zircon cores are charac-terized by typical oscillatory zoning and highly HREE enriched patterns, which suggests their magma origin. Some zircon cores among them with little Pb loss give SHRIMP U-Pb ages rang-ing from 753 to 780 Ma, which suggests that the protolith of Huilanshan granulite is Neopro-terozoic mafic rocks. The zircon mantles usually cut across the oscillatory zone of the zircon cores have 3―10 times lower REE, Th, U, Y, Nb and Ta contents than the igneous zircon cores but have high common Pb contents. These characteristics suggest that they were formed by hydrothermal alteration of the igneous zircons. The part of zircon mantles with little Pb loss give a similar SHRIMP U-Pb age (716―780 Ma) to the igneous zircon cores, which implies that the hydrothermal events occurred closely to the magmatic emplacement. In view of the strong early Cretaceous magmatism in the Luotian dome, consequently, the Huilanshan mafic granulite was formed by heating of the Neoproterozoic mafic rocks in mid-low crust, which caused the granu-lite-facies metamorphism underneath the Dabie Mountains. The similarity between the granulite metamorphic age (136 ± 18 Ma) defined by Sm-Nd isochron and K-Ar age of 123―127 Ma given by amphible from the gneiss in Luotian dome suggests a rapid uplifting of the Luotian dome, which may result in further exhumation of the ultrahigh pressure metamorphic rocks in the Dabie Mountains.

关键词： Dabie orogen, granulite, zircon U-Pb ages, Sm-Nd age.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Lunar surface dielectric constant,regolith thickness, and ~3He abundance distributions retrieved from the microwave brightness temperatures of CE-1 Lunar Microwave Sounder

引用

science china Earth sciences 2010年第9期53卷 1365-1378页

作者： wang ZhenZhan1, li Yun1,2, JIANG JingShan1 & li DiHui1 1 National Microwave Remote Sensing Laboratory, center for space science and Applied research, Chinese Academy of sciences, Beijing 100190, china 2 Graduate university of Chinese Academy of sciences, Beijing 100049, china National Microwave Remote Sensing Laboratory Center for Space Science and Applied Research Chinese Academy of Sciences Beijing China Graduate university of Chinese Academy of sciences Beijing China

Lunar regolith parameters, such as physical temperature, thickness and dielectric constant, are important in studying regolith features, distribution of lunar resources and evolution of the Moon. There had been no measurement obtained by lunar-orbit-borne microwave radiometer applied to evaluate the properties of lunar regolith before CE-1 Lunar Microwave Sounder (CELMS) being launched. CEMLS is the first passive microwave radiometer in the world to sound the surface of the Moon. The brightness temperatures (TB) sensed by CELMS include complicated information on the above geophysical parameters. In this paper, algorithms of retrieving dielectric constant, regolith thickness, and 3He content from CELMS brightness temperatures are developed, and the results are compared with those from literature. The results show that the regolith thicknesses are mostly in the range of 4.0-6.0 m, and 43% of them are bigger than 5.0 m. The content of 3He evaluated by retrieved regolith thickness is about 1.03 million tons.

关键词： CE-1 Lunar Microwave Sounder (CELMS) lunar regolith dielectric constant lunar regolith thickness 3He retrieval

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

research on the reconstruction method of porous media using multiple-point geostatistics

引用

science china(Physics,Mechanics & Astronomy) 2010年第9期53卷 122-134页

作者： ZHANG Ting 1,2,3, li DaoLun 1,2 , LU DeTang 1,2 & yang Jiaqing 1,2 1 Department of Modern Mechanics, university of science and technology of china, Hefei 230027, china 2 research center of Oil and Natural Gas, university of science and technology of china, Hefei 230027, china 3 The 28th research Institute, china Electronics technology Group Corporation, Nanjing, 210007, china Department of Modern Mechanics University of Science and Technology of China Hefei China research center of Oil and Natural Gas University of Science and Technology of China Hefei China The 28th research Institute China Electronics Technology Group Corporation Nanjing China

The pore structural characteristics have been the key to the studies on the mechanisms of fluids flow in porous media. With the development of experimental technology, the modern high-resolution equipments are capable of capturing pore structure images with a resolution of microns. But so far only 3D volume data of millimeter-scale rock samples can be obtained losslessly. It is necessary to explore the way of virtually reconstructing larger volume digital samples of porous media with the representative structural characteristics of the pore space. This paper proposes a reconstruction method of porous media using the structural characteristics captured by the data templates of multiple-point geostatistics. In this method, the probability of each structural characteristic of a pore space is acquired first, and then these characteristics are reproduced according to the probabilities to present the real structural characteristics in the reconstructed images. Our experimental results have shown that: (i) the deviation of LBM computed permeability respectively on the virtually reconstructed sandstone and the original sample is less than 1.2%; (ii) the reconstructed sandstone and the original sample have similar structural characteristics demonstrated by the variogram curves.

关键词： porous media reconstruction multiple-point geostatistics pore space training image variogram data template

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A study on the simulation of carbon and water fluxes of Dangxiong alpine meadow and its response to climate change

引用

Atmospheric and Oceanic science Letters 2024年第5期17卷 22-27页

作者： lingyun He Lei Zhong Yaoming Ma Yuting qi jie liu Peizhen li School of Earth and space sciences University of Science and Technology of ChinaHefeiChina CAS center for Excellence in Comparative Planetology HefeiChina Jiangsu Collaborative Innovation center for Climate Change NanjingChina Key Laboratory of Tibetan Environment Changes and Land Surface Processes Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijingChina College of Earth and Planetary sciences University of Chinese Academy of SciencesBeijingChina College of Atmospheric sciences Lanzhou UniversityLanzhouChina Qomolangma Atmospheric and Environmental Observation and research Station TingriChina Kathmandu center for research and Education Chinese Academy of Sciences-Tribhuvan UniversityBeijingChina china-Pakistan Joint research center on Earth sciences IslamabadPakistan

The alpine meadow ecosystem accounts for 27%of the total area of the Tibetan Plateau and is also one of the most important vegetation *** Dangxiong alpine meadow ecosystem,located in the south-central part of the Tibetan Plateau,is a typical *** understand the carbon and water fluxes,water use efficiency(WUE),and their responses to future climate change for the alpine meadow ecosystem in the Dangxiong area,two parameter estimation methods,the Model-independent Parameter Estimation(PEST)and the Dynamic Dimensions Search(DDS),were used to optimize the Biome-BGC ***,the gross primary productivity(GPP)and evapotranspiration(ET)were *** results show that the DDS parameter calibration method has a better *** annual GPP and ET show an increasing trend,while the WUE shows a decreasing ***,ET and GPP reach their peaks in July and August,respectively,and WUE shows a“dual-peak”pattern,reaching peaks in May and ***,according to the simulation results for the next nearly 100 years,the ensemble average GPP and ET exhibit a significant increasing trend,and the growth rate under the SSP5–8.5 scenario is greater than that under the SSP2–4.5 *** shows an increasing trend under the SSP2–4.5 scenario and a significant increasing trend under the SSP5–8.5 *** study has important scientific significance for carbon and water cycle prediction and vegetation ecological protection on the Tibetan Plateau.

关键词： Carbon and water flux Water use efficiency Alpine meadow Biome-BGC model Climate change

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Study on NDVI-T_s space by combining LAI and evapotranspiration

引用

science china Earth sciences 2006年第7期49卷 747-754页

作者： HAN lijuan1,2,3, wang Pengxin4, yang Hua1,2,3, liU shaomin1,2,3.& wang Jindi1,2,3 1. research center for Remote Sensing and GIS, School of Geography, Beijing Normal university, Beijing 100875, china 2. State Key Laboratory of Remote Sensing science, Beijing 100875, china 3. Beijing Key Laboratory for Remote Sensing of Environment and Digital Cities, Beijing 100875, china 4. Department of Information Management, College of Information and Electronic Engineering, china Agricultural university, Beijing 100083, china research center for Remote Sensing and GIS School of Geography Beijing Normal University Beijing China State Key Laboratory of Remote Sensing science Beijing China Beijing Key Laboratory for Remote Sensing of Environment and Digital Cities Beijing China Department of Information Management College of Information and Electronic Engineering China Agricultural University Beijing China

This paper focuses on interpreting the different spatial relationships between NDVI and Ts, a triangular or a trapezoid, and on analyzing transformation conditions, the physical and ecological meanings of the vegetation index-surface temperature space as well. Further, we use the Tempera-ture-Vegetation Dryness Index (TVDI) to explain the existent meaning of a triangular space after NDVI reaches its saturated state by employing the relationships between NDVI, LAI and evapotranspiration. The specific relations between NDVI and Ts are useful for describing, validating and updating land surface models.

关键词： NDVI, land surface temperature, evapotranspiration, leave area index.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthesis of tetrahedrally coordinated CoO for higher alcohol synthesis directly from syngas

引用

Frontiers of Chemical science and Engineering 2024年第8期18卷 99-109页

作者： Zhuoshi li Han yang Xiaofeng Pei Jiahui li Jing Lv Shouying Huang Yue wang Xinbin Ma Key Laboratory for Green Chemical technology of Ministry of Education Collaborative Innovation Center of Chemical Science and EngineeringSchool of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Joint School of National university of Singapore and Tianjin university International Campus of Tianjin UniversityBinhai New CityFuzhou 350207China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China

Higher alcohol synthesis directly from syngas is highly desirable as one of the efficient non-petroleum energy conversion ***0–Co^(O)catalysts showed great potential for this reaction,but the alcohol selectivity still needs to be improved and the crystal structure effect of Co^(O)on catalytic behaviors lacks ***,a series of tetrahedrally coordinated Co^(O)polymorphs were prepared by a thermal decomposition method,which consisted of wurtzite CoO and zinc blende CoO with varied *** diluting with SiO_(2),the catalyst showed excellent performance for higher alcohol synthesis with ROH selectivity of 45.8%and higher alcohol distribution of 84.1 wt%under the CO conversion of 38.0%.With increasing the content of wurtzite CoO,the Co^(0)/Co^(2+)ratio gradually increased in the spent catalysts,while the proportion of highly active hexagonal close packed cobalt in Co^(0)decreased,leading to first decreased then increased CO ***,the higher content of zinc blende CoO in fresh catalyst facilitated the retention of more Co^(2+)sites in spent catalysts,promoting the ROH selectivity but slightly decreasing the distribution of higher *** catalyst with 40%wurtzite CoO obtained the optimal performance with a space time yield toward higher alcohols of 7.9 mmol·gcat^(-1)·h^(-1).

关键词： higher alcohol synthesis CO hydrogenation wurtzite CoO zinc blende CoO hexagonal-closest-packed Co

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Global view of Hopf bifurcations of a van der Pol oscillator with delayed state feedback

引用

science china(Technological sciences) 2010年第3期53卷 595-607页

作者： ZHANG li1,wang HuaiLei1 & HU HaiYan1,2 1 MOE Key Lab of Mechanics and Control of Aerospace Structures,Nanjing university of Aeronautics and Astronautics,Nanjing 210016,china 2 School of Aerospace Engineering,Beijing Institute of technology,Beijing 100081,china MOE Key Lab of Mechanics and Control of Aerospace Structures Nanjing University of Aeronautics and Astronautics Nanjing China School of Aerospace Engineering Beijing Institute of Technology Beijing China

This paper presents both analytical and numerical studies on the global view of Hopf bifurcations of a van der Pol oscillator with delayed state *** on a detailed analysis of the stability switches of the trivial equilibrium of the system,the stability charts are given in a parameter space consisting of the time delay and the feedback *** center manifold reduc-tion and the normal form method are used to study Hopf bifurcations with respect to the time *** gain an insight into the persistence of a Hopf bifurcation as the time delay varies farther away from its critical value,the method of multiple scales is used to obtain the global view of Hopf bifurcations with respect to the time *** the analytical results of Hopf bifurca-tions and global view of those bifurcations are validated via a collocation scheme implemented on *** most important discovery in this paper is the well-structured global view of Hopf bifurcations for the system of concern,showing the generality of the persistence of Hopf bifurcations.

关键词： Hopf bifurcation global view center manifold reduction method of multiple scales collocation scheme

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of space flight on DNA mutation and secondary metabolites of licorice (Glycyrrhiza uralensis Fisch.)

引用

science china(life sciences) 2009年第10期52卷 977-981页

作者： GAO WenYuan1, li KeFeng1, YAN Shuo1, GAO XiuMei2 & HU liMin2 1 School of Pharmaceuticals science and technology, Tianjin university, Tianjin 300072, china 2 research center of Traditional Chinese Medicine, Tianjin university of Traditional Chinese Medicine, Tianjin 300193, china School of Pharmaceuticals science and technology Tianjin University Tianjin 300072 China. pharmgao@***

licorice (Glycyrrhiza uralensis Fisch.) seeds were flown on a recoverable satellite for 18 days(the average radiation dose in the flight recovery module was 0.102 mGy/d, the distance from flight apogee to earth was 350 km, gravity 10-6). After returning to earth, the seeds were germinated and grown to maturity. The parallel ground-based seeds were also planted under the same conditions. The leaves of licorice were used for inter-simple sequence repeat (ISSR) analysis and the two main secondary me-tabolites in one-year-old roots were analyzed by high performance liquid chromatography (HPLC). Among 22 random primers used in this experiment, 6 primers generated different DNA band types. Analysis of HPLC showed that the content of glycyrrhizic acid (GA) and liquiritin (LQ) in the roots from seeds flown in space was respectively 2.19, 1.18 times higher than that of the control group. The results demonstrated that the extraterrestrial environment induced mutagenic effects on licorice and affected its secondary metabolites. These changes indicated that extraterrestrial orbit is possible means of breeding of licorice so as to preserve this endangered medicinal plant.

关键词： licorice space flight ISSR DNA mutation secondary metabolites

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Bioinformatics analyses for signal transduction networks

引用

science china(life sciences) 2008年第11期51卷 994-1002页

作者： liU Wei1,2, li Dong2, ZHU YunPing2 & HE FuChu1,2 1 College of Mechanical & Electronic Engineering and Automatization, National university of Defense technology, Changsha 410073, china 2 State Key Laboratory of Proteomics, Beijing Proteome research center, Beijing Institute of Radiation Medicine, Beijing 102206, china College of Mechanical & Electronic Engineering and Automatization National University of Defense Technology Changsha China State Key Laboratory of Proteomics Beijing Proteome Research Center Beijing Institute of Radiation Medicine Beijing China

research in signaling networks contributes to a deeper understanding of organism living activities. With the development of experimental methods in the signal transduction field, more and more mechanisms of signaling pathways have been discovered. This paper introduces such popular bioin-formatics analysis methods for signaling networks as the common mechanism of signaling pathways and database resource on the Internet, summerizes the methods of analyzing the structural properties of networks, including structural Motif finding and automated pathways generation, and discusses the modeling and simulation of signaling networks in detail, as well as the research situation and tendency in this area. Now the investigation of signal transduction is developing from small-scale experiments to large-scale network analysis, and dynamic simulation of networks is closer to the real system. With the investigation going deeper than ever, the bioinformatics analysis of signal transduction would have immense space for development and application.

关键词： signal transduction structural motif automated pathways regeneration dynamics simulation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：