检索结果-南通市图书馆

Reconstructing mean maximum temperature of growing season from the maximum density of the Schrenk Spruce in Yili,Xinjiang,china

引用

chinese Science Bulletin 2009年第13期54卷 2300-2308页

作者： CHEN Jin1,2,3,WANG LiLi1,4,5,ZHU HaiFeng1 & WU Pu1 1 Institute of Geographic sciences and Natural Resources Research,chinese academy of sciences,beijing 100101,china 2 graduate university of chinese academy of sciences,beijing 100049,china 3 Institute of Vertebrate Paleontology and Paleoanthropology,chinese academy of sciences,beijing 100044,china 4 Institute of Tibetan Plateau Research,chinese academy of sciences,beijing 100085,china 5 Institute of Desert and Meteorology,china Meteorological Administration,ürümqi 830002,china Institute of Geographic sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China graduate university of chinese academy of sciences Beijing 100049 China Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of Sciences Beijing 100044 China Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100085 China Institute of Desert and Meteorology China Meteorological Administration Ürümqi 830002 China

To study the historical temperature variation in Yili of Xinjiang,the tree-ring chronologies of maximum density(MXD) and tree-ring width(TRW) were established with the Schrenk Spruce(Picea schrenkiana *** Mey) collected from six sites to analyze the characteristics and ability of response to climate *** results suggest that the MXD chronology of the Schrenk Spruce from different sampling sites responded to climate change well and were positively correlated with the mean maximum temperature and the mean temperature from April to August in the study *** mean maximum temperature anomaly from April to August,spanning the years from 1848 to 2000,was reconstructed by three MXD chronologies which were selected by stepwise *** reconstructed function was stable and explained 56.2% of the *** reconstructed results indicated a cold span of 153 years in spring and summer from the beginning of the 1950s to the beginning of the 1970s in the Yili *** strongly increasing tendency was detected in the mean maximum temperature anomaly from April to August during this reconstructed period.

关键词：平均最高气温伊犁谷地最大密度云杉胡杨生长季节新疆树木年轮宽度

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

Orbit determination and prediction accuracy analysis for a regional tracking network

引用

Science china(Physics,Mechanics & Astronomy) 2010年第6期53卷 1130-1138页

作者： ZHOU ShanShi 1,2,3 ,HU XiaoGong 1 & WU Bin 1 1 Shanghai Astronomical Observatory,chinese academy of sciences,Shanghai 200030,china 2 graduate university of chinese academy of sciences,beijing 100049,china 3 Research Center of GNSS,Wuhan 430079,china Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai China graduate university of chinese academy of sciences Beijing China Research Center of GNSS Wuhan China

china's COMPASS satellite navigation system relies on a regional tracking network to provide navigation services. Limited by its geographic border,the regional network is able to cover only 30% of the medium-earth-orbits(MEO). Accuracy of determined and predicted orbits is not able to satisfy system requirements if the tracking data processing strategy for global tracking network processing is used for the regional network. Two major error sources for orbital prediction are accuracy of initial orbital elements and dynamical modeling. To achieve better prediction accuracy,we propose a two-step orbit determination and prediction strategy. For step 1,only solar radiation pressure(SRP) parameters are estimated along with the orbital elements and other parameters; for step 2,all parameters are estimated but the SRP parameters are tightly constrained to their step 1 estimates. Experimenting with data from a regional GPS network,we conclude for orbital prediction using the proposed two-step strategy,the average user range error(URE) for 24-h prediction arcs is better than 0.6 m.

关键词： orbit determination and prediction regional tracking network URE

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

Genomic organization and sequence analysis of the vomeronasal receptor V2R genes in mouse genome

引用

chinese Science Bulletin 2007年第3期52卷 336-342页

作者： YANG Hui1,2 & Zhang YaPing1,3 1 Laboratory of Cellular and Molecular Evolution, Kunming Institute of Zoology, chinese academy of sciences, Kunming 650223, china 2 graduate university of the chinese academy of sciences, beijing 100049, china 3 Laboratory for Conservation and Utilization of Bio-resources, Yunnan university, Kunming 650091, china Laboratory of Cellular and Molecular Evolution Kunming Institute of Zoology Chinese Academy of Sciences Kunming 650223 China graduate university of the chinese academy of sciences Beijing 100049 China Laboratory for Conservation and Utilization of Bio-resources Yunnan University Kunming 650091 China

Two multigene superfamilies, named V1R and V2R, encoding seven-transmembrane-domain G-protein coupled receptors (GPCRs) have been identified as pheromone receptors in mammals. Three V2R gene families have been described in mouse and rat. Here we screened the updated mouse genome se- quence database and finally retrieved 63 putative functional V2R genes including three newly identified genes which formed a new additional family. We described the genomic organization of these genes and also characterized the conservation of mouse V2R protein sequences. These genomic and se- quence information we described are useful as part of the evidence to speculate the functional domain of V2Rs and should give aid to the functionality study in the future.

关键词：大白鼠基因组犁鼻受体2 多基因超家族序列分析

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 revision of Elaeagnus L. (Elaeagnaceae) in china's mainland

引用

Journal of Systematics and Evolution 2010年第5期48卷 356-390页

作者： 1,2 Miao SUN 1Qi LIN 1(State Key Laboratory of Systematic and Evolutionary Botany,Institute of Botany,chinese academy of sciences,beijing 100093,china) 2(graduate university of chinese academy of sciences,beijing 100049,china)

A revision of Elaeagnus *** china’s mainland is provided based on field observations and herbarium ***-two morphological characters are selected and coded,then the matrix is prepared following cluster *** characters and species delimitation are re-evaluated resulting in the recognition of 36 species,one subspecies and five varieties in china’s *** species names and three variety names are regarded as new *** information covers full synonyms,type information,description,taxonomic remarks,distribution range,occupied habitats,examined specimens,relevant illustrations,and references to selected published illustrations and reports.A key for whole species determination is *** lectotypification of Elaeagnus magna(Serv.)*** been designated.

关键词： cluster analysis Elaeagnaceae Elaeagnus relationships synonymy taxonomic revision.

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

An ID-based authenticated dynamic group key agreement with optimal round

引用

Science china(Information sciences) 2012年第11期55卷 2542-2554页

作者： TENG JiKai1,2,WU ChuanKun1 & TANG ChunMing3 1State Key Laboratory of Information Security,Institute of Software of chinese academy of sciences,beijing 100090,china 2graduate university of chinese academy of sciences,beijing 100049,china 3Faculty of Mathematic and Information Science,Guangzhou university,Guangzhou 510006,china State Key Laboratory of Information Security Institute of Software of Chinese Academy of Sciences Beijing China graduate university of chinese academy of sciences Beijing China Faculty of Mathematic and Information Science Guangzhou University Guangzhou China

Group key agreement protocols are crucial for achieving secure group *** are designed to provide a set of users with a shared secret key to achieve cryptographic goal over a public *** group membership changes,the session key should be refreshed efficiently and *** previous group key agreement protocols need at least two rounds to establish or refresh session *** this paper,a dynamic authenticated group key agreement(DAGKA) protocol based on identity-based cryptography is *** making use of the members' values stored in previous sessions,our Join and Leave algorithms reduce the computation and communication costs of *** the proposed protocol,Setup and Join algorithms need one *** session key can be refreshed without message exchange among remaining users in Leave algorithm,which makes the protocol more *** security is proved under decisional bilinear Diffie-Hellman(DBDH) assumption in random oracle model.

关键词： identity-based cryptography dynamic group key agreement provably secure admissible pairing

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Characterization of GLUT4-containing vesicles in 3T3-L1 adipocytes by total internal reflection fluorescence microscopy

引用

Science china(Life sciences) 2009年第7期52卷 665-671页

作者： WANG Yan1,2,ZHANG JinZhong1,2,CHEN Yu1,2,JIANG Li1,2,JI Wei1,2 & XU Tao1 1 National Laboratory of Biomacromolecules,Institute of Biophysics,chinese academy of sciences,beijing 100101,china 2 graduate university of chinese academy of sciences,beijing 100049,china National Laboratory of Biomacromolecules Institute of Biophysics Chinese Academy of Sciences Beijing China graduate university of chinese academy of sciences Beijing China

Insulin-responsive GLUT4(glucose transporter 4) translocation plays a major role in regulating glucose uptake in adipose tissue and *** or not there is a specialized secretory GSV(GLUT4 storage vesicle) pool,and more importantly how GSVs are translocated to the PM(plasma membrane) under insulin stimulation is still under *** the present study,we systematically analyzed the dynamics of a large number of single GLUT4-containing vesicles in 3T3-L1 adipocytes by TIRFM(total internal reflection fluorescence microscopy).We found that GLUT4-containing vesicles can be classified into three groups according to their mobility,namely vertical,stable,and lateral GLUT4-containing *** these groups,vertical GLUT4-containing vesicles exclude transferrin receptors and move towards the PM specifically in response to insulin stimulation,while stable and lateral GLUT4-containing vesicles contain transferrin receptors and show no insulin *** data demonstrate that vertical GLUT4-containing vesicles correspond to specialized secretory GSVs,which approach the PM directly and bypass the constitutive recycling pathway.

关键词： GLUT4 IRAP-pHluorin GSV transferring TIRFM

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 fast onboard star-extraction algorithm optimized for the SVOM Visible Telescope

引用

Science china(Physics,Mechanics & Astronomy) 2010年第S1期53卷 51-55页

作者： WANG TianZhou1,2,QIU YuLei1,CAI HongBo1 & DENG JingSong1 1 National Astronomical Observatories,chinese academy of sciences,beijing 100012,china 2 graduate university of chinese academy of sciences,beijing 100049,china chinese academy of sciences National Astronomical Observatories Beijing China (GRID:grid.9227.e) (ISNI:***) graduate university of chinese academy of sciences Beijing China (GRID:grid.458514.9) chinese academy of sciences National Astronomical Observatories Beijing China (GRID:grid.9227.e) (ISNI:***)

The Space multi-band Variable Object Monitor(SVOM) is a proposed chinese astronomical satellite,dedicated to the detection,localization and measurement of gamma-ray bursts(GRBs) on a cosmological *** efficient algorithm is developed for the purpose of onboard star extraction from the CCD images obtained with the Visible Telescope(VT) onboard the *** CCD pixel coordinates of the reference stars will be used to refine the astronomical position of the satellite,which will facilitate triggering rapid ground-based follow-up observations of the *** this algorithm,the image is divided into a number of grid cells and the "global" pixel-value maximum within each cell is taken as the first-guess position of a "bright" *** correct center position of a star is then computed using a simple iterative *** two additional strategies,i.e.,scanning the image only by even(or odd) lines or in a black-white chess board mode,we propose to further reduce the time to extract the *** examine the efficiency of the above algorithms,we applied them to the experimental images obtained with a ground-based *** find that the accuracy of the astronomical positioning achieved by our method is comparable to that derived by using the conventional star-extraction method,while the former needs about 25 times less CPU time than the *** will significantly improve the performance of the SVOM VT mission.

关键词： gamma-ray burst(GRBs) SVOM VT on board computation

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

Three-dimensional decomposition method of global atmospheric circulation

引用

Science china Earth sciences 2008年第3期51卷 386-402页

作者： LIU HaiTao1,2,3, HU ShuJuan4, XU Ming5 & CHOU JiFan6,7 1 State Key Laboratory of Numerical Modeling for Atmospheric sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, chinese academy of sciences, beijing 100029, china 2 graduate university of chinese academy of sciences, beijing 100049, china 3 beijing Climate Center, beijing 100089, china 4 Department of Mathematics, Lanzhou university, Lanzhou 730000, china 5 Shanghai Typhoon Institute, Shanghai 200030, china 6 Department of Atmospheric sciences, Lanzhou university, Lanzhou 730000, china 7 china Meteorological Administration Training Center, beijing 100089, china State Key Laboratory of Numerical Modeling for Atmospheric sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China graduate university of chinese academy of sciences Beijing China beijing Climate Center Beijing China Department of Mathematics Lanzhou University Lanzhou China Shanghai Typhoon Institute Shanghai China Department of Atmospheric sciences Lanzhou University Lanzhou China china Meteorological Administration Training Center Beijing China

By adopting the idea of three-dimensional Walker, Hadley and Rossby stream functions, the global atmospheric circulation can be considered as the sum of three stream functions from a global perspective. Therefore, a m... 详细信息

关键词： three-dimensional decomposition of the global atmospheric circulation generalized Walker Hadley and Rossby stream functions existence and uniqueness vertical motion

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

Electronic structure and magnetism of Fe-doped SiC nanotubes

引用

Science china(Physics,Mechanics & Astronomy) 2010年第9期53卷 1582-1589页

作者： ZHANG WeiHu1,2,3,ZHANG FuChun3,ZHANG ZhiYong4,LU ShuYuan5 & YANG YanNing3 1 Xi’an Institute of Optics and Precision Mechanics,chinese academy of sciences,Xi’an 710068,china 2 graduate university of chinese academy of sciences,beijing 100049,china 3 College of Physics and Electronic Information,Yan’an university,Yan’an 716000,china 4 Information Science and Technology Institution,Northwest university,Xi’an 710127,china 5 Department of Telecommunications,Xi’an Institute of Posts and Telecommunications,Xi’an 710121,china Xi"an Institute of Optics and Precision Mechanics Chinese Academy of Sciences graduate university of chinese academy of sciences College of Physics and Electronic Information Yan"an University Information Science and Technology Institution Northwest

The electronic structure and magnetic properties of Fe-doped SiC nanotubes are investigated by using the first-principles method based on density functional theory(DFT) in the local spin density approximation(LSDA).The calculation results indicate that the SiC nanotube of Fe substitution for C exhibits antiferromagnetism while ferromagnetism features prominently when Fe substitutes *** is a kind of half-metal magnetic *** formation energy calculation results show that the formation energy of ferromagnetic structure is 3.2 eV lower than that of antiferromagnetic *** atoms are more likely to replace Si ***-orbit coupling induces electron spin polarization in the ground ***,the doping Fe atoms make relaxation towards the outside of the tube to some extent and larger geometric distortion occurs when Fe substitutes C,but the whole geometric structure of SiC nanotubes is not damaged due to the *** is revealed in the calculation of energy band structure and density of states that more dispersed distribution of energy levels is produced near the Fermi *** Fe substitution for Si,obviously there are spin-split and intense p-d hybrid effects by Si 3p electron spins and Fe 3d electron spins localized at the exchanging interactions between magnetic transitional metal(TM) *** electronic density results indicate that system magnetic moments are mainly generated by the unpaired 3d electrons of Fe *** these results show that the transition metal doping SiC nanotube could be a potential route to fabricating the promising magnetic materials.

关键词： SiC nanotube the first-principles doped magnetic properties

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 and characterization of LiCo_(1/3)Ni_(1/3)Mn_(1/3)O_2 prepared by Pechini process

引用

Rare Metals 2006年第z1期25卷 7-11页

作者： LI Zhigang WANG Tiandiao KANG Xueya Xinjiang Technical Institute of Physics and Chemistry Chinese Academy of Sciences Urumuqi 830011 China graduate university of chinese academy of sciences Beijing 100049 China Xinjiang Technical Institute of Physics and Chemistry Chinese Academy of Sciences Urumuqi 830011 China Xinjiang Technical Institute of Physics and Chemistry Chinese Academy of Sciences Urumuqi 830011 China

Layered cathode material LiCo1/3Ni1/3Mn1/3O2 was synthesized by Pechini process, and investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM) and galvanostatic charge/discharge cycling. The sample is well-crystallized and has a phase-pure a-NaFeO2 structure. The particle sizes are uniform, and distributed in the range of 20-200 nm. The initial discharge capacity of the Li/LiCo1/3Ni1/3Mn1/3O2 cell was about 149 mAh·g-1 when it was cycled at a voltage range of 4.5-2.3 V with a specific current of 0.25 mA. The result is better in comparison with solid-state solution method. The synthetic procedure was discussed. Three major reactions: chelation, esterification, and polymerization successively occurred.

关键词： layered cathode material LiCo_(1/3)Ni_(1/3)Mn_(1/3)O_2 Pechini method structure morphology electrochemical properties

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：