检索结果-南通市图书馆

Science China Earth sciences 2004年第9期47卷 794-803页

作者： zhang yueqiao1, chen wen2. 3.& yang nong1 1. institute of geomechanics, {2. academy of Geological {4., beijing 100081, China 2. institute of Geology, {2. academy of Geological {4., beijing 100037, China 3. institute of Geology and Geophysics, {2. academy of {4., beijing 10002., China institute of {1. Chinese Academy of Geological Sciences Beijing 100081 China institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China

Based on field geological survey, structural measurements and classical Ar/Ar dating of mica, biotite and K-feldspar, we obtain cooling ages for Miocene left-lateral shear along the Xianshuihe fault zone. The results document two thermal events during the sinistral shear. The early event (1.-1. Ma) corresponds to rapid cooling of the Zheduoshan granitic massif from above 700℃ to below 350℃. The late event (5-3.5 Ma) corresponds to cooling of granites intruded along the eastern side of the fault zone. These dating results provide important thermochronological constraint on the timing of late Cenozoic eastward extrusion of the Chuan-Dian Block in the SE Tibetan margin.

关键词： Xianshuihe fault zone, Zheduoshan granitic massif, sinistral shear deformation, 4.Ar/39Ar dating, late Cenozoic.

Temporal-spatial variations of euphotic depth of typical lake regions in Lake Taihu and its ecological environmental significance

在线全文

学校读者我要写书评

暂无评论

Science China Earth sciences 2006年第4期49卷 431-442页

作者： zhang Yunlin1, 2. QIN Boqiang1, HU Weiping1, WANG Sumin1, chen Yuwei1 & chen Weimin1 1. Nanjing {4. of Geography & Limnology, {4. academy of sciences, Nanjing 2.0008, China 2. Graduate School of the {4. academy of sciences, beijing 100039, China 1. Nanjing institute of Geography & Limnology Chinese Academy of Sciences Nanjing 210008 China 2. Graduate School of the chinese {1. of {2. Beijing 100039 China

By using the data of underwater irradiance measured in the different lakeregions of Lake Taihu during 1.98—2.04.and total suspended solids (TSS), wind speeds of the total1. stations in typical lake regions during 1.93—2.03, this paper analyzes the factors ofinfluencing on PAR (pho-tosynthetically available radiation) attenuation, euphotic depth, andpresents the temporal and spatial variations of euphotic depth of typical lake regions in LakeTaihu, and the spectral distributions of euphotic depth at station 2. The results show that theconcentration of TSS is the most important factor impacting PAR attenuation, followed by chlorophylla; chromophoric dissolved organic matter (CDOM) has little impact on the PAR euphotic depth. During1.93—2.03, the mean yearly PAR euphotic depths of the typical lake regions ranged from 1.04.to1.95 m with a mean value of 1.35±0.2. m. The PAR euphotic depth fell into 3 spatial zone types:Type Ⅰ, the lowest, including the lake center and the inflows of rivers; Type Ⅱ, intermediate,including Meiliang Bay, Wulihu Lake and Gonghu Bay; Type Ⅲ, the greatest, including the East LakeTaihu; corresponding mean depths were approximately 1.1. 1.4. 2.0 m, respectively. The seasonalvariations of euphotic depths were not quite the same in different lake regions. In the lake center,the mean values of PAR euphotic depth in summer and autumn were significantly greater than those inwinter and spring; in the Meiliang Bay, winter means were significantly greater than in the otherthree seasons; in the East Lake Taihu, winter means were significantly less than in the other threeseasons. However, no distinct seasonal change was recorded in the Wulihu Lake, Gonghu Bay and theinflows of rivers. The spectral distributions of euphotic depth present a minimal value at the bluelight wave band of 4.0 nm, and a peak at the green light wave band of around 580 nm. In 1.98 and1.99, based on the seasonal many-day continuous measurements, the PAR euphotic depths at station 2.

关键词： lake taihu euphotic depth diffuse attenuation coefficient total suspendedsolid ecological

Dynamics of morphological changes for mitochondrial fission and fusion

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2010年第4期53卷 680-689页

作者： WANG ShiQi 1.2.4., FU ChangLiang 1.2., {2. Yan 1.2., {1. Quan 3.& LONG Mian 1.2.1.Key Laboratory of Microgravity (National Microgravity Laboratory), beijing 1.01.0, China 2.Center for Biomechanics and Bioengineering, institute of Mechanics, {12. academy of sciences, beijing 1.01.0, China 3 State Key Laboratory of Biomembrane and Membrane Biotechnology, institute of Zoology, {12. academy of sciences, beijing 1.01.1. China 4.institute of Vertebrate Paleontology and Paleoanthropology, {12. academy of sciences, beijing 1.004., China 1. Key Laboratory of Microgravity (National Microgravity Laboratory) Beijing 100190 China2. Center for Biomechanics and Bioengineering Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China4. Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of Sciences Beijing 100044 China3. State Key Laboratory of Biomembrane and Membrane Biotechnology Institute of Zoology Chinese Academy of Sciences Beijing 100101 China

Mitochondria experience continuous fusion and fission in a living cell, but their dynamics remains poorly quantified. Here a theoretical model was developed, upon a simplified population balance equation (PBE), to predict the morphological changes induced by mitochondrial fission and fusion. Assuming that both fission and fusion events are statistically independent, the survival probability of mitochondria staying in the fission or fusion state was formulated as an exponentially-decayed function with time, which depended on the time-dependent distribution of the mitochondrial volume and the fission and fusion rates. Parametric analysis was done for two typical volume distributions. One was Gamma distribution and the other was Gaussian distribution, derived from the measurements of volume distribution for individual mitochondria in a living cell and purified mitochondria in vitro. The predictions indicated that the survival probability strongly depended on morphological changes of individual mitochondria and was inversely correlated to the fission and fusion rates. This work provided a new insight into quantifying the mitochondrial dynamics via monitoring the evolution of the mitochondrial volume.

关键词： mitochondria morphology fission fusion dynamics modeling

Estimation on dynamic release of phosphorus from wind-induced suspended particulate matter in Lake Taihu

在线全文

学校读者我要写书评

暂无评论

Science China Earth sciences 2004年第8期47卷 710-719页

作者： FAN chengxin1, zhang Lu1,2. QIN Boqiang1, WANG Sumin1, HU Weiping1 & zhang chen1 1. Taihu Lake Laboratory for Ecosystem Research, Nanjing {4. of Geography & Limnology, chinese academy of sciences, Nanjing 2.0008, China 2. Graduate School of chinese academy of sciences, {14. 100039, China 1. Taihu Lake Laboratory for Ecosystem Research Nanjing Institute of Geography & Limnology Chinese Academy of Sciences 210008 Nanjing China 2. Graduate School of chinese {1. of {2. 100039 Beijing China

Through man-made disturbance experiments, the corresponding relationships be-tween suspended particulate matter (SPM) and wind speed in different lake areas were simu-lated, the physicochemical formal transformation and biological mineralizing and decaying processes of phosphorus in SPM were studied, the contribution of phosphorus transformation to phosphorus loading of the water of Lake Taihu was quantitatively estimated. The results show that about 0.4. t·a-1.loading in Lake Taihu mainly comes from phosphorus-releasing action of SPM in physicochemical transformed to soluble reactive phosphorus (SRP), and the contribution mainly from biological mineralizing and decaying was about 4.1}.8 t·a-1. which is equal to 1..0% of the total external loading of Lake Taihu, namely 4.7—7.5 times as much as SRP loading en-tering the lake by the rivers; thus it is the important source in dynamical internal loading of the lake. The determining factors for dynamical internal loading in lakes are organic phosphorus content in suspended solid and its biological transition availability.

关键词： phosphorus release,wind wave disturbance,particulate decaying,dynamical loading,Lake Taihu.

Transformation of GbSGT1.gene into banana by an Agrobacterium-mediated approach

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2007年第10期17卷 1241-1243页

作者： Li Shengjun1. wen Ruiming2. Pei Xinwu1. {1. Shikai2. Li Weimin and Jia Shirong1.1. Biotechnology institute, chinese academy of Agricultural {4., beijing 100081, China 2. Xinyi institute of Agricultural Science and Technology, Xinyi 52.530, China) Biotechnology institute Chinese Academy of Agricultural Sciences Beijing 100081 China Xinyi institute of Agricultural Science and Technology Xinyi 523530 China

SGT1.is a homologue of the yeast ubiquitin ligase-associated protein. It controls some protein degradation and activates defense pathway in plants. Cotton GbSGT1.gene (Gossypium barbadense) has been isolated and characterized in previous work. In this study, the plant expression vector pBSGT1.with bar gene as a selection agent was constructed and transgenic banana was obtained via Agrobacterium-mediated transformation with the assistance of particle bombardment and screened with PCR and Basta spreading on banana plant leaves. Estimating of transgenic banana plants for resistance to Panama wilt is in progress.

关键词： transgenic banana Agrobacterium-mediated GbSGT1.

Influence factors of sparse microwave imaging radar system performance:approaches to waveform design and platform motion analysis

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Information sciences) 2012年第10期55卷 2301-2317页

作者： zhang Zhe 1.2.3,zhang Bing{4. 1.2.JIANG {4.gLong 1.2.3,XIANG Yin 1.2.HONG wen 1.2.& WU YiRong 1.2.1.Science and Technology on Microwave Imaging Laboratory,{12. 1.01.0,China 2.institute of Electronics,chinese {24. of sciences,{12. 1.01.0,China 3 Graduate University,chinese {24. of sciences,{12. 1.01.0,China 1. Science and Technology on Microwave Imaging Laboratory Beijing 100190 China 2. institute of Electronics Chinese Academy of Sciences Beijing 100190 China 3. Graduate University Chinese Academy of Sciences Beijing 100190 China

Sparse microwave imaging radar is a newly developed concept of microwave imaging system,which tries to combine the traditional radar imaging system with sparse signal processing theories,achieving the aim of reducing the complexity of microwave imaging systems and enhancing the system *** this paper,we introduce some basic concepts of sparse signal processing theory,and then apply it to the traditional radar imaging system to get the mathematical model of sparse microwave imaging *** analyze the factors that determine the performance of sparse microwave imaging radar,including scene,waveform and *** to the radar model,we analyze how these factors influence the radar system and how to optimize *** results of the sparse microwave imaging radar system are also provided.

关键词： sparse microwave imaging radar synthetic aperture radar compressive sensing Lq regularization waveform design

Characteristics of InGaN multiple quantum well blue-violet laser diodes

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological sciences) 2006年第6期49卷 727-732页

作者： LI Deyao1. zhang Shuming1. WANG Jianfeng1. {1. Jun1. {1. Lianghui2. CHONG Ming2. ZHU Jianjun1. ZHAO Degang1. LIU Zongshun1. yang Hui1.& LIANG Junwu1.1. State Key Laboratory of Integrated Optoelectronics, {4. of Semiconductors, chinese academy of sciences, beijing 1.0083, China 2. Nano-Optoelectronics Laboratory, {4. of Semiconductors, chinese academy of sciences, beijing 1.0083, China State Key Laboratory of Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China Nano-Optoelectronics Laboratory Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China

Studies on InGaN multiple quantum well blue-violet laser diodes have been reported. Laser structures with long-period multiple quantum wells were grown by metal-organic chemical vapor deposition. Triple-axis X-ray diffraction (TAXRD) measurements show that the multiple quantum wells were high quality. Ridge waveguide laser diodes were fabricated with cleaved facet mirrors. The laser diodes lase at room temperature under a pulsed current. A threshold current density of 3.3 kA/cm[2.; a characteristic temperature T 0 of 1.5 K were observed for the laser diode.

关键词： metalorganic chemical vapor deposition (MOCVD), GaN-based laser diodes, multiple quantum well, ridge waveguide, threshold current.

Simulating the impacts of climate variation and land-cover changes on basin hydrology: A case study of the Suomo basin

在线全文

学校读者我要写书评

暂无评论

Science China Earth sciences 2005年第9期48卷 1501-1509页

作者： chen Junfeng1.2. LI Xiubin2.& {1. Ming2.1. institute of Remote Sensing & GIS, Peking University, beijing 1.0871. China 2. institute of Geographical sciences and Natural Resources Research, {14. academy of sciences, beijing 1.01.1. China 1. institute of Remote Sensing & GIS Peking University 100871 Beijing China 2. institute of Geographical {1. and Natural Resources Research Chinese Academy of Sciences 100101 Beijing Chin

Impacts of land cover changes on watershed hydrology have been a long-term academic concern with acute dispute. But little attention has been paid to such effects on mesoscale river basins, where the society has a closer link to river hydrology. The present study focuses on a mesoscale river basin, the Suomo Basin that is located on the upper reaches of the yangtze River. Land covers in the basin in the years 1.70, 1.86 and 1.99 were mapped. A lumped hydrologic model, CHARM, and a distributed hydrologic model, SWAT, were used to model the impacts of both land-cover change and climate variation on river runoff during the past four decades. The results show that the contribution of climate variation to the change of runoff regime makes up 60%―80%, while that of land cover changes only {4.%.

关键词： climate variation, land-cover changes, Suomo Basin, CHARM model, SWAT model.

Quantitative prediction model for the depth limit of oil accumulation in the deep carbonate rocks:A case study of Lower Ordovician in Tazhong area of Tarim Basin

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2024年第1期21卷 115-124页

作者： wen-{1. Wang Xiong-Qi Pang Ya-Ping Wang {2.-Xin chen Fu-Jie Jiang Ying chen State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing102249China College of Geosciences China University of Petroleum(Beijing)Beijing102249China Research institute of Exploration and Development PetroChina Southwest Oil&Gas Field CompanyChengdu610041SichuanChina Chemical and Petroleum Engineering Schulich School of EngineeringUniversity of CalgaryCalgaryT2N 1N4Canada

With continuous hydrocarbon exploration extending to deeper basins,the deepest industrial oil accumulation was discovered below 8,2.0 m,revealing a new exploration ***,the extent to which oil exploration can be extended,and the prediction of the depth limit of oil accumulation(DLOA),are issues that have attracted significant attention in petroleum *** it is difficult to characterize the evolution of the physical properties of the marine carbonate reservoir with burial depth,and the deepest drilling still cannot reach the ***,the DLOA cannot be predicted by directly establishing the relationship between the ratio of drilling to the dry layer and the *** this study,by establishing the relationships between the porosity and the depth and dry layer ratio of the carbonate reservoir,the relationships between the depth and dry layer ratio were obtained *** depth corresponding to a dry layer ratio of 1.0%is the *** on this,a quantitative prediction model for the DLOA was finally *** results indicate that the porosity of the carbonate reservoir,Lower Ordovician in Tazhong area of Tarim Basin,tends to decrease with burial depth,and manifests as an overall low porosity reservoir in deep *** critical porosity of the DLOA was 1.8%,which is the critical geological condition corresponding to a 1.0%dry layer ratio encountered in the *** depth of the DLOA was 9,000 *** study provides a new method for DLOA prediction that is beneficial for a deeper understanding of oil accumulation,and is of great importance for scientific guidance on deep oil drilling.

关键词： Deep layer Tarim Basin Hydrocarbon accumulation Depth limit of oil accumulation Prediction model

Evaluation of the Interfacial Adhesion between Brittle Coating and Ductile Substrate by Cross-Sectional Indention

在线全文

学校读者我要写书评

暂无评论

材料热处理学报 2004年第5B期25卷 1187-1190页

作者： SUJian-yu zhangKun {1.Guang-nan instituteofMechanics ChineseAcademyofSciencesBeijingChina／／GraduateSchooloftheChineseAcademyofSciencesBeijingChina instituteofMechanics ChineseAcademyofSciencesBeijingChina

The cross-sectional indentation method is extended to evaluate the interfacial adhesion between brittle coating and ductile substrate. The experimental results on electroplated chromium coating/steel substrate show that the interfacial separation occurs due to the edge chipping of brittle coating. The corresponding models are established to elucidate interfacial separation processes. This work further highlights the advantages and potential of this novel indentation method.

关键词：分界面附着刻痕可锻衬底应力涂层铬钢