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,{1., {2. {3. of Geological Sciences, beijing 100081, china 2. institute of Geology, {2. {3. of Geological Sciences, beijing 1.003., china 3. institute of Geology and Geophysics, {2. {3. of Sciences, beijing 1.002., 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 3.0℃. 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, 40Ar/3.Ar dating, late Cenozoic.

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

在线全文

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 Bingchen 1.2.JIANG chengLong 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.{23. of Electronics,chinese academy of Sciences,{12. 1.01.0,china 3.Graduate University,chinese academy 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

Cloning and expression of putative ethylene receptor genes in soybean plant

在线全文

同方期刊数据库

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 1152-1160页

作者： Xie Zongming1.2.3. Lei Gang1.2. Wuri{2.han Hada1.2. Tian Aiguo1. {1. Jinsong1.and chen Shouyi1.1. National Key Laboratory of Plant Genomics, {13. of Genetics and Developmental Biology, chinese {12. of Sciences, beijing 1.01.1. china 2. Graduate School of chinese {12. of Sciences, beijing 1.003., china 3. Xinjiang {12. of Agricultural and Reclamation Science, Shihezi 83.1}00, china) National Key Laboratory of Plant Genomics Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing 100101 China Graduate School of chinese {1. of Sciences Beijing 100039 China Xinjiang academy of Agricultural and Reclamation Science Shihezi 832000 China

Ethylene plays important roles in plant growth, development, and stress responses, and ethylene receptors have been identified and studied extensively in various plant species. Here we report the cloning of four ethylene receptor genes from soybean, i.e. GmETR1. GmERS1. GmETR2.and GmEIN4. Construction of the phylogenic tree showed that GmETR1.and GmERS1.belong to subfamily I whereas GmETR2.and GmEIN4 belong to subfamily II. The four ethylene receptor genes showed different tissue-specific expression patterns in roots, stems, leaves, cotyledons, flowers, pods and seeds of soybean. These genes were differentially regulated by various abiotic stresses and plant hormones. The possible roles of the four genes in soybean plant were also discussed.

关键词： abiotic stress expression analysis ethylene receptor plant hormone soybean.

Analysis for twinning and slip in face-centered cubic crystals under axisymmetric co-deformation

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5期49卷 521-536页

作者： chen Zhiyong1.2. CAI Hongnian1. {1. Xinming2. WANG Fuchi1.& TAN chengwen1.3.1. School of Material Science and Engineering, beijing institute of Technology,{13.,{12. 2. School of Material Science and Engineering, Central South University, Changsha 41.083.{12. 3. School of Material Science and Engineering, beijing University of Aeronautics and Astronautics, beijing 1.0083.{12. 1. School of Material Science and Engineering Beijing Institute of Technology Beijing 100081 China 2. School of Material Science and Engineering Central South University Changsha 410083 China 3. School of Material Science and Engineering Beijing University of Aeronautics and Astronautics Beijing 100083 China

The maximum work principle of Bishop-Hill was developed to analyze the axisymmetric co-deformation in face-centered cubic crystals (f.c.c.) for twinning on {111} 112.and slip on {111} 110 systems. The influence of ξ , the ratio of critical re- solved shear stress for twinning to slip, on the yield stress states and corresponding active slip or/and twinning systems for orientations in the standard stereographic triangle of cubic crystal was investigated systematically. The Taylor factors and the anisotropy of yield strength for three important orientations [100], [110] and [111] in orientation space were analyzed. It is found that the yield strength asymmetry for the case of axisymmetric de- formation of tension and compression can be explained based on the microscopic theory of crystal plasticity. The concept of orientation factor for twinning ability was proposed and the deformation mechanism map in the orientation space was established for the case of axisymmetric deformation. The deformation texture formation and development of f.c.c. crystals with low stacking fault energy for axisymmetric tension can be explained qualita- tively on the basis of analyzed results.

关键词： twinning slip face-centered cubic crystals axisymmetric co-deformation Bishop-Hill maximum work principle yield strength anisotropy

Possible mechanism of the effect of convection over Asian-Australian “land bridge” on the East Asian summer monsoon onset

在线全文

学校读者我要写书评

暂无评论

Science china Earth Sciences 2006年第11期49卷 1223-1232页

作者： HE Jinhai1. wen Min2. DING Yihui{1. zhang Renhe2.1. Jiangsu Key Laboratory of Meteorological Disaster (KLME), Nanjing institute of Meteorology, Nanjing University of Informa- tion Science and Technology, Nanjing 2.0}044, china 2. State Key Laboratory of Severe Weather (LaSW), chinese academy of Meteorological Sciences,{13., china 3. National Climate Center, chinese Meteorological Administration,{13., china 1. Jiangsu Key Laboratory of Meteorological Disaster (KLME) Nanjing Institute of Meteorology Nanjing University of Information Science and Technology Nanjing 210044 China 2. State Key Laboratory of Severe Weather (LaSW) Chinese Academy of Meteorological Sciences Beijing 100081 China 3. National Climate Center Chinese Meteorological Administration Beijing 100081 China

The Asian-Australian “land bridge” is an area with the most vigorous convection in Asian monsoon region in boreal spring, where the onset and march of convection are well associated with the onset of East Asian summer monsoon. The convection occurs over Indo-china Peninsula as early as mid-April, which exerts critical impact on the evolution of monsoon circulation. Before mid-April there are primarily sensible heatings to the atmosphere over Indo-china Peninsula and Indian Peninsula, so the apparent heating ratios over them decrease with height. However, after mid-April it changes into latent heating over Indo-china Peninsula due to the onset of convection, and the apparent heating ratio increases with height in mid- and lower troposphere. The vertical distribution of heating ratio and its differences between Indo-china Peninsula and Indian Peninsula are the key factors leading to the splitting of boreal subtropical high belt over the Bay of Bengal. Such mechanism is strongly supported by the fact that the evolution of the vertical heating ratio gradient above Indo-china Peninsula leads that of 850 hPa vorticity over the Bay of Bengal. Convections over Indo-china Peninsula and its surrounding areas further increase after the splitting. Since then, there is a positive feedback lying among the convective heating, the eastward retreat of the subtropical high and the march of monsoon, which is a possible mechanism of the advance of summer monsoon and convection from Indo-china Peninsula to South china Sea.

关键词： Asian-Australian 'land bridge', tropical convection, Indo-china Peninsula, the splitting of boreal subtropical high belt, East Asian summer monsoon onset.

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. {1. Yuwei1.& {1. Weimin1.1. Nanjing institute of Geography & Limnology, chinese {12. of Sciences, Nanjing 2.1}008, china 2. Graduate School of the chinese {12. of Sciences, beijing 1.003., china 1. Nanjing institute of Geography & Limnology Chinese Academy of Sciences Nanjing 210008 China 2. Graduate School of the chinese {1. of Sciences 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 1.3.±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 400 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, {12. of Mechanics, chinese academy of Sciences, beijing 1.01.0, china 3.State Key Laboratory of Biomembrane and Membrane Biotechnology, {12. of Zoology, chinese academy of Sciences, beijing 1.01.1. china 4 {12. of Vertebrate Paleontology and Paleoanthropology, chinese academy of Sciences, beijing 1.0044, 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

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 Sciences, beijing 100081, china 2. Xinyi institute of Agricultural Science and Technology, Xinyi 52.53., 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.

Preparing a re-sequencing DNA library of 2.cancer candidate genes using the ligation-by-amplification protocol by two PCR reactions

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(Life Sciences) 2009年第5期52卷 483-491页

作者： SU Yeyang1,2.3. LIN Lin1,2.3. TIAN Geng1,2.3. chen chen2.3. LIU Tao2.3. XU Xingya3. QI XinPeng1,2.3. zhang XiuQing2.3. yang HuanMing2.3.1 Graduate School of {13. academy of Sciences, beijing 100049, china 2.beijing institute of Genomics, {13. academy of Sciences, beijing 10002., china 3.beijing Genomics institute, beijing 1013.0, china Graduate School of chinese {1. of Sciences Beijing 100049 China beijing {1. of Genomics Chinese Academy of Sciences Beijing 100029 China beijing Genomics {1. Beijing 101300 China

To meet the needs of large-scale genomic/genetic studies, the next-generation massively parallelized sequencing technologies provide high throughput, low cost and low labor-intensive sequencing service, with subsequent bioinformatic software and laboratory methods developed to expand their applications in various types of research. PCR-based genomic/genetic studies, which have significant usage in association studies like cancer research, haven't benefited much from those next-generation sequencing technologies, because the shortgun re-sequencing strategy used by such sequencing machines as the Illumina/Solexa Genome Analyzer may not be applied to direct re-sequencing of short-length target regions like those in PCR-based genomic/genetic studies. Although several methods have been proposed to solve this problem, including microarray-based genomic selections and selector-based technologies, they require advanced equipment and procedures which limit their applications in many laboratories. By contrast, we overcame such potential drawbacks by utilizing a ligation by amplification (LBA) protocol, a method using a pair of Universal Adapters to randomly ligate target regions in a two-step-PCR procedure, whose Long LBA products were easily fragmented and sequenced on the next-generation sequencing machine. In this concept-proven study, we chose the consensus coding sequences of two human cancer genes: BRCA1.and BRCA2.as target regions, specifically designed LBA primer pairs to amplify and randomly ligate them. 70 target sequences were successfully amplified and ligated into Long LBA products, which were then fragmented to construct DNA libraries for sequencing on both a conventional Sanger sequencer ABI 3.3.xl DNA Analyzer and the next-generation 'synthesis by sequencing technology' Illumina/Solexa Genome Analyzer. Bioinformatic analysis demonstrated the utility and efficiency (including the coverage and depth of each target sequence and the SNPs detection effectiveness) o

关键词： health genomics the next-generation sequencing techonology sequencing technology large-scale genomics PCR

Petrogenesis and dating of the Kangding complex,Sichuan Province

在线全文

学校读者我要写书评

暂无评论

Science china Earth Sciences 2005年第5期48卷 622-634页

作者： chen Yuelong 1 , LUO Zhaohua 1 , ZHAO Junxiang, LI Zhihong, zhang Hongfei & SONG Biao 3.1. Faculty of Earth Sciences and Natural Resources,{2. University of Geosciences, {3. 100083.{2. 2. Faculty of Earth Sciences,{2. University of Geosciences, Wuhan 43.074,{2. 3. {3. SHRIMP Center, institute of Geology, chinese academy of Geological Sciences, {3. 10003.,{2. 1. Faculty of Earth Sciences and Natural Resources China University of Geosciences 100083 Beijing China 2. Faculty of Earth Sciences China University of Geosciences 430074 Wuhan China 3. beijing SHRIMP Center Institute of Geology Chinese Academy of Geological Sciences 100037 Beijing China

An analysis of major and trace element geochemistry and SHRIMP U-Pb zircon dating of mafic, intermediate, and felsic rocks from the Mianning metamorphic complex of Si- chuan Province was conducted. One of our conclusions is that a majority of the zircons crystal- lized between 72.0}and 773.Ma in a magmatic regime. The complexes contain early to late Pa- leo-proterozoic relict zircons from ancient continental crust. The oldest age, 2.68 Ma, may rep- resent the basement of the yangtze block. Overgrowth zircon rims and palingenetic zircons have been observed and dated, and are believed to have formed after crystallization, during Paleozoic and Mesozoic metamorphic-anatexis. We also conclude that depletion of Nb, Ta, HREE, in a spider-diagram normalized to primitive mantle and calc-alkaline association, implies that they formed in island-arc or under-plating settings.

关键词： Kangding complex, zircons, SHRIMP, tectonic setting.