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. Academy of Geological Sciences,{3., china 2. institute of Geology, {2. Academy of Geological Sciences, beijing 1.003., china 3. institute of Geology and Geophysics, {2. Academy 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.

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

在线全文

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

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

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

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 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, beijing 100081, china 3. National Climate Center, chinese Meteorological Administration, beijing 100081, 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.

Cloning and expression of putative ethylene receptor genes in soybean plant

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 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 Academy of Sciences, {12. 1.01.1. china 2. Graduate School of chinese Academy of Sciences, {12. 1.003., china 3. Xinjiang Academy 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 Academy 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.

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

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 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.

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

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 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 Academy of Sciences, Nanjing 2.1}008, china 2. Graduate School of the chinese Academy 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 Academy 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

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, chinese Academy of Sciences, beijing 1.01.1. china 1. institute of Remote Sensing & GIS Peking University 100871 Beijing China 2. institute of Geographical Sciences 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 2.%.

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

Numerical simulation of topography effects on the “00.7” severe rainfall in beijing

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2005年第9期15卷 818-826页

作者： zhang Chaolin1.*, JI Chongping1. KUO Yinghwa{3. FAN Shuiyong1. XUAN Chunyi3.and {1. Min1.1. institute of Urban Meteorology, china Meteorological Administration, beijing 1.0089, china {3. Mesoscale and Microscale Meteorology Division, National Center for Atmospheric Research, Boulder, CO 803.7-3.00, USA 3. beijing Meteorological Bureau, beijing 1.0089, china) institute of Urban Meteorology China Meteorological Administration Beijing 100089 China. Mesoscale and Microscale Meteorology Division National Center for Atmospheric Research Boulder CO 80307-3000 USA. beijing Meteorological Bureau Beijing 100089 China

In an effort to study the severe rainfall event of 4—5th July 2.00 in beijing (with 2.h accumulated precipitation of 2.0 mm), we perform numerical simulations to investigate this event using the MM5v3.6 model. The model is initialized with the MM5/WRF 3.VAR analysis, which incorporates the ground-based GPS precipitable water vapor, automatic and conventional meteorological observations in its assimilation step. For 2. h accumulated precipitation forecast, the threat scores are 0.72. 0.76, 0.67 and 0.63. for thresholds of 1. 5, 1., and 2. mm, respectively. Holding other factors unchanged, sensitivity experiments were conducted with different topographic resolutions of 1.0, 50 and 3.7 km to investigate the topographic effects on precipitation over the beijing area. In these sensitivity experiments, we attempt to preserve the realistic orographic distribution in the model topography under the condition of keeping the dynamic-thermodynamic consistency of the initial model atmosphere to the extent possible. Results indicate that the unique topographic distribution and variations in the beijing area play an important role in determining the location, distribution and intensity of heavy precipitation.

关键词： topography heavy rainfall 3.VAR ground-based GPS numerical simulation.

Research progress in the inner surface modification of metal tubes by plasma processing

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 2006年第11期16卷 1119-1126页

作者： zhang Guling~ 1,2.**, WU Xingfang~1, GU Weichao~2. {3. Guangliang~2. FENG {2.ran~2. NIU Erwu~2. LI Li~2. L Guohua~2. {3. Huan~2. FAN Songhua~2. LIU Chizi~2.and yang Size~2.1. School of Material Science and Engineering, University of Science and Technology beijing, beijing 100083. china 2. beijing National Laboratory for Condensed Matter Physics, institute of Physics, chinese Academy of Sciences, beijing 100080, china) School of Material Science and Engineering University of Science and Technology Beijing Beijing 100083 China beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100080 China

The recent progress in inner surface hardening of tubes by plasma processing is summerized. Several techniques of inner surface plasma source ion implantation and deposition are introduced, and their advantages and disadvantages are discussed. The basic principles, technical features and new progress of inner surface plasma source ion implantation methods for metal tubes, which were developed in our laboratory, are described in detail. And perspectives of the future technical development for inner surface ion implantation of tubes are presented.

关键词： PSII metal tubes inner surface surface modification.