检索结果-南通市图书馆

The global image of the Moon obtained by the Chang'E-1.Data processing and lunar cartography

在线全文

学校读者我要写书评

暂无评论

Science china Earth {1. 2010年第8期53卷 1091-1102页

作者： LI ChunLai1, LIU JianJun1, REN Xin1, MOU LingLi1, ZOU YongLiao1, zhang HongBo1, Lü Chang1, LIU JianZhong1, ZUO Wei1, SU Yan1, WEN WeiBin1, BIAN Wei1, ZHAO BaoChang2. YANG JianFeng2. ZOU XiaoDuan1, wang Min1, XU Chun1, KONG DeQing1, wang XiaoQian1, wang Fang1, GENG liang1, zhang ZhouBin1, ZHENG lei1, ZHU XinYing1, LI JunDuo1 & OUYANG ZiYuan11 National Astronomical Observatories, chinese academy of sciences, beijing 100012.{2. 2.Xi’an institute of Optics and Precision mechanics, chinese academy of sciences, Xi’an 710119, china 1. National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China2. Xi’an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Xi’an 710119 China

The global lunar image of the first phase of chinese Lunar Exploration Program is the first image that covered all over the surface of the Moon. It will serve as a critical foundation for succeeding exploration and scientific research. In this paper, the acquisition, characteristics, and data quality of Chang'E-1.CCD image data are described in detail. Also described are the methodology and procedure of data processing. According to rule of planetary cartography, the image data have been processed, geometrically corrected, and then mosaicked and merged in a scale of 1.{1.5 million. The results of data processing and charting show that the image data of Chang'E-1.CCD and their geometric precision meet the demand of charting a map in the scale of 1.{1.5 million. The relative geometric positioning precision of the global image is better than {1.0 m, and the absolute geometric positioning precision is slightly better than that of the ULCN{1.05 and Clementine lunar basemap (V{1.0). The plane positioning precision is approximately 1.0-1.00 m. This global image proves to be the best global image of the Moon so far in terms of space coverage, image quality, and positioning precision.

关键词： Chang’E-1 lunar CCD data processing lunar image position lunar global image

Genomic data and ecological niche modeling reveal an unusually slow rate of molecular evolution in the Cretaceous Eupteleaceae

在线全文

学校读者我要写书评

暂无评论

Science china(Life {1.) 2024年第4期67卷 803-816页

作者： Kun-Li Xiang Sheng-Dan Wu lian lian Wen-Chuang He Dan Peng Huan-Wen Peng Xiao-Ni {2. Hong-lei Li Jia-Yu Xue Hong-Yan Shan Gui-Xia Xu Yang Liu Zhi-Qiang Wu Wei wang State Key Laboratory of Plant Diversity and Specialty Crops Institute of BotanyChinese Academy of SciencesBeijing 100093China Shenzhen Branch Guangdong Laboratory of Lingnan Modern AgricultureKey Laboratory of Synthetic BiologyLaboratory of the Ministry of Agriculture and Rural AffairsAgricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhen 518120China china National Botanical Garden Beijing 100093China State Key Laboratory of Grassland Agro-Ecosystems and College of Ecology Lanzhou UniversityLanzhou 730000China University of chinese academy of sciences Beijing 100049China College of Landscape Architecture and Life Science/institute of Special Plants Chongqing University of Arts and SciencesChongqing 402160China College of Horticulture Academy for Advanced Interdisciplinary StudiesNanjing Agricultural UniversityNanjing 210095China Fairylake Botanical Garden Shenzhen&Chinese Academy of SciencesShenzhen 518004China

Living fossils are evidence of long-term sustained ecological ***,whether living fossils have little molecular changes remains poorly known,particularly in ***,we have introduced a novel method that integrates phylogenomic,comparative genomic,and ecological niche modeling analyses to investigate the rate of molecular evolution of Eupteleaceae,a Cretaceous relict angiosperm family endemic to East *** assembled a high-quality chromosome-level nuclear genome,and the chloroplast and mitochondrial genomes of a member of Eupteleaceae(Euptelea pleiosperma).Our results show that Eupteleaceae is most basal in Ranunculales,the earliest-diverging order in eudicots,and shares an ancient whole-genome duplication event with the other *** document that Eupteleaceae has the slowest rate of molecular changes in the observed *** unusually low rate of molecular evolution of Eupteleaceae across all three independent inherited genomes and genes within each of the three genomes is in association with its conserved genome architecture,ancestral woody habit,and conserved niche *** findings reveal the evolution and adaptation of living fossil plants through large-scale environmental change and also provide new insights into early eudicot diversification.

关键词： conservation genomics eudicots evolutionary rates niche conservatism phylogenomics

Analytical method of radiation by a wave energy device with dual rectangular floating bodies

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2010年第3期29卷 106-115页

作者： wang Wensheng YOU Yage {1. Yunqiu WU Bijun YE Yin Guangzhou institute of Energy Conversion Chinese Academy of Sciences Guangzhou 510640 China Key Laboratory of Renewable Energy and Gas Hydrate Chinese Academy Sciences Guangzhou 510640 China Graduate University Chinese Academy of Sciences Beijing 100049 China

The system with one floating rectangular body on the free surface and one submerged rectangular body has been applied to a wave energy conversion device in water of finite depth. The radiation problem by this device on a plane incident wave is solved by the use of an eigenfunction expansion method, and a new analytical expression for the radiation velocity potential is obtained. The wave excitation force is calculated via the known incident wave potential and the radiation potential with a theorem of Haskind employed. To verify the correctness of this method, an example is computed respectively through the bound element method and analytical method. Results show that two numerical methods. are in good agreement, which shows that the present method is applicable. In addition, the trends of hydrodynamic coefficients and wave force are analyzed under different conditions by use of the present analytical method.

关键词： wave energy device hydrodynamic coefficients wave force analytical method

Experimental Analysis of Shear Strength of Undisturbed Soil in Leucaena Forest in Jiangjia Ravine,Yunnan,china

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2010年第4期7卷 386-395页

作者： JIAO Zhen Key Laboratory of Mountain Hazards and earth surfaceprocesses ChineseAcademy of Sciences Chengdu 610041 China Graduate University of chinese{1. of {2. Beijing I ooo49 China institute of Mountain Hazards and Environment Chinese Academy of Science Chengdu 61oo41 China

Five leucaena trees of similar age were chosen in Jiangjia Ravine of Dongchuan,Yunnan Province,china,near which the soil samples were collected by digging profiles {1. in depth and 1. in *** each section,soil samples at different depths were taken for direct shear experiments to determine the root amount and mechanical *** is found that the cohesion and internal friction angle of the undisturbed soil are related to the root amount,depth,clay content and breccias *** correlates negatively with root content,a finding that differs from that of other *** addition,internal friction angle correlates positively with all these factors.

关键词： Jiangjia Ravine Leucaena Undisturbedsoil Shear strength Impact factors

THz spectrum of reduced glutathione

在线全文

学校读者我要写书评

暂无评论

Science china(Physics,{1. & Astronomy) 2005年第5期48卷 585-592页

作者： wang Weining1. YAN Haitao1. YUE Weiwei1. ZHAO Guozhong1. {1. Cunlin1. LIU Haibo{2. {1. Xicheng2.1. Department of Physics, Capital Normal University, beijing 1.0037, china 2. Center for Terahertz Research, Rensselaer Polytechnic institute, Tory, NY, USA 1. Department of Physics Capital Normal Univesity 100037 Beijing China 2. Center for Terahertz Research Rensselaer Polytechnic Institute Tory NY USA

The optical characteristics of reduced glutathione molecules between 0.2.THz and 2.4 THz have been investigated by THz time-domain spectroscopy (THz-TDS). The absorption characteristics and optical parameters of the reduced glutathione purged with Nitrogen at room temperature were obtained experimentally. The measured results were fitted well with the theoretical results computed by using Density Functional Theory (DFT) in far-infrared range. Also the conformation of the reduced glutathione molecule was simulated by Gaussian 03. This work has demonstrated significantly that THz-TDS spectroscopy can further be used to study other biological molecules in biological and biomedical engineering.

关键词： THz time domain spectroscopy, reduced glutathione, absorption spectrum, biological engineering.

Insights into Euphorbia diversity: Probing the contrasts between Euphorbia fischeriana Steud and Euphorbia ebracteolata Hayata

在线全文

学校读者我要写书评

暂无评论

Journal of Pharmaceutical Analysis 2024年第5期14卷 775-779页

作者： Kaicheng Du Yi zhang {1. Sun Muke Tao Tiantian Zuo Yumeng {2. Zhengfeng zhang Dali Meng School of Traditional chinese Materia Medica Shenyang Pharmaceutical UniversityShenyang110016China NMPA Key Laboratory for Quality Monitoring of Narcotic Drugs and Psychotropic Substances Chongqing Institute for Food and Drug ControlChongqing401121China National institutes for Food and Drug Control Beijing100050China

In traditional chinese medicine(TCM),Euphorbia fischeriana Steud(***)and Euphorbia ebracteolata Hayata(***),commonly referred to as“Langdu”,are widely extensively utilized for treating lymphatic tuberculosis and ringworm[1..Both plant species are perennial herbaceous plants mainly distributed in northeastern{1.,Mongolia,Russia(Siberia),and Republic of Korea[2..There have been many reports on the chemical constituents and pharmacological effects of the two plant species,which has made more and more researchers realize that there may be differences between *** and *** some cases,long-term improper use of herbal medicines can even lead to life-threatening conditions[3,4].Therefore,it is essential to employ an effective technology to differentiate between these two plants based on their chemical constituents and biological activities,so as to reduce the harm caused by the mixing and misuse of medicinal ***,the present paper describes a study of the differences between *** and ***,using untargeted plant metabolomics and biological activity *** study aims to provide valuable insight into their equivalence and potential interchangeability in TCM and clinical medication.

关键词： Euphorbia Siberia northeastern

Gas formation mechanism of marine carbonate source rocks in china

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

Science china Earth {1. 2005年第4期48卷 441-453页

作者： ZHAO Wenzhi1, wang Zhaoyun1, HE Haiqing2. zhang Mingjie3, wang Hongjun1, wang Yunpeng4 & QIN Yong5 1. Research institute of Petroleum Exploration & Development, Petrochina, beijing 100083, china 2. Petrochina Exploration & Production, beijing 100011, china 3. Department of Geology, Lanzhou University, Lanzhou 730000, china 4. Guangzhou Geochemical institute, chinese academy of sciences, Guangzhou 510640, china 5. china University of Mining and Technology, Xuzhou 2.1000, china 1. Research institute of Petroleum Exploration & Development 100083 PetroChinaBeijin China 2. Petro{1. Exploration & Production 100011 Beijing China 3. Department of Geology Lanzhou University 730000 Lanzhou China 4. Guangzhou Geochemical institute Chinese Academy of Sciences 510640 Guangzhou China 5. china University of Mining and Technology 221000 Xuzhou China

By breaking through the conventional ideology on the study of gas-formation mechanism of source rocks which focused on merely the characteristics of source rocks them- selves, and based on the development and distribution characteristics of marine carbonate source rocks in the medium-to-bottom parts of the chinese superimposed sedimentary basins as well as various processes in the course of gas generation and reservoir forming, the complex hydrocarbon-generating model of carbonates is established. Such a model concerns not only the “three-stage” gas formation characteristics of carbonates, but also the gas generation process due to a thermal cracking of oil and the re-generation process of gas from heated secondary organic matters during the gas-generation and reservoir-forming course. The high-quality hy- drocarbon generating matter of marine carbonate source rocks determined a high gas-oil ratio and tended to form paleo-oil-reservoirs, representing an enrichment process of organic matters. The thermal cracking of oil in palaeo-oil-reservoirs is an important means for the effective forma- tion of gas reservoirs. The secondary organic matters in carbonate reservoirs may regenerate gas after a secondary deep burial, thus becoming an effective gas source.

关键词： carbonate, three-stage hydrocarbon generation, inhibitive effect of maturity, oil-cracking gas, second-ary asphalt gas.

Effect of high-multiple water injection on rock pore structure and oil displacement efficiency

在线全文

学校读者我要写书评

暂无评论

Energy Geoscience 2024年第1期5卷 234-238页

作者： Xiao lei Chunpeng Zhao Qiao{1.g {2. Panrong wang Runfu Xiong Zhanjiang Branch Company CNOOCZhanjiang524057GuangdongChina SINOPEC Petroleum Exploration and Production Research institute Beijing100083China

Experimental methods,including mercury pressure,nuclear magnetic resonance(NMR)and core(wateroil)displacement,are used to examine the effects of high-multiple water injection(*** injection with high injected pore volume)on rock properties,pore structure and oil displacement efficiency of an oilfield in the western South china *** results show an increase in the permeability of rocks along with particle migration,an increase in the pore volume and the average pore throat radius,and enhanced heterogeneity after high-multiple water *** with normal water injection methods,a high-multiple water injection is more effective in improving the oil displacement *** degree of recovery increases faster in the early stage due to the expansion of the swept area,and the transition from oil-wet to *** degree of recovery increases less in the late stage due to various factors,including the enhancement of heterogeneity in the *** both the economic aspect and the production limit of water flooding,it is recommended to adopt other technologies to further enhance oil recovery after 300 PV water injection.

关键词： High multiple Water injection Rock permeability Pore structure Oil displacement efficiency

Mechanisms of the pancake vortex and vortex line movement in the high T_c superconductors Bi_2.r_2.aCu_2._8+δ and La_(1.93)Sr0.0_7CuO_4+δ

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

Science china(Physics,{1. & Astronomy) 2007年第2期50卷 240-248页

作者： wang WeiXian1,ZHOU Fang2.TAN Shun1,WU Huan1 & zhang YuHeng1 1 National High Magnetic Field Laboratory,University of Science and Technology of{2.,Hefei 2.002.,china 2.National Laboratory for Superconductivity,lnstitute of Physics and the Center for Condensed Matter Physics,chinese academy of sciences,beijing 100080,china 1. National High Magnetic Field Laboratory University of Science and Technology of China Hefei 230026 China 2. National Laboratory for Superconductivity Institute of Physics and the Center for Condensed Matter Physics Chinese Academy of Sciences Beijing 100080 China

In the strict sense, it is not very clear why with magnetic field increasing, the normal-superconductive (NS) transition becomes broad for Bi2.r2.aCu2.8+δ(Bi2.1.0} while the NS transitions are almost parallel for La1.3Sroo7Cu04+δ(La2.4). In this paper, R-T relations are measured by the six-probe method. We propose a moving mechanism of the pancake vortex and vortex line for Bi2.1.0} The theoretical curves fit the experiment data well.

关键词： superconductivity superconductive pancake vortex dynamics