检索结果-南通市图书馆

Oxygen isotopic (^(17)O-^(18)O) heterogeneity in Archaean continental nucleus, North China Craton

在线全文

学校读者我要写书评

暂无评论

chinese Science Bulletin 1999年第24期44卷 2267-2269页

作者： liu Jianzhong, ZHANG Fuqin, li chunlai and WANG Shijie {3. of geochemistry ,{3. , guiyang 550002 , China {3. of Geophysics ,{3. , Beijing 100101 , China institute of geochemistry Chinese Academy of Sciences Guiyang China institute of Geophysics Chinese Academy of Sciences Beijing China

The oxygen isotopic data for amphibolites from Archaean continental nucleus, North China Craton indicate that ( i ) the evolving lines structured by the data are parallel to the geoselenic evolving line, which means that the parent materials of these continental nucleus o-riginated from solar matter; ( ii ) different intercepts for these evolving lines manifest that oxy-

关键词： North China Craton oxygen isotope (I7O-18O ) heterogeneity.

Regulation mechanism of EM parameters in natural ferrite and its application in microwave absorbing materials

在线全文

学校读者我要写书评

暂无评论

Science China(Technological sciences) 2006年第1期49卷 38-49页

作者： ZHENG Yongchun1,2, WANG Shijie2, FENG Junming2, li chunlai1, OUYANG Ziyuan1,2, liu Jianzhong1 & li Xiaobiao2 1. National Astronomical Observatories, chinese academy of sciences, Beijing 100012, China 2. State Key Laboratory of Environmental geochemistry, {3. of geochemistry, chinese academy of sciences, guiyang 550002, China 1. National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China 2. State Key Laboratory of Environmental geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China

Electromagnetic (EM) parameters (ε ′, ε ″, μ ′, μ″ ) of several M2+Fe2O4 and Fe2O3.type natural ferrites with different geological occurrences are measured in this pa-per. The measurement results show that EM parameters of a magmatic-occurring natural ferrite is very different from other types occurring from sedimentary-metamorphic iron deposit, hydrothermal vein iron deposit, outer contact of magmatic iron deposit. It has potential to be used as magnetic absorbent in microwave absorbing materials. After min-eral separation and concentration, this magmatic-occurring natural ferrite was processed into type A ferrite absorbent. Type A natural ferrite absorbent is a kind of magnetic material with low dielectric constants, high magnetic conductivity and high EM loss. Its EM pa-rameters are ε ′ = 58.60, ε ″ = 10.0, μ ′ = 1.2-1.5, μ ″ = 1.0-1.2, respectively. In order to illuminate the regulation mechanism of EM parameters, we studied the chemical and mineral composition of type A ferrite absorbent. There is high concentration of natural impurities, which regulate the EM parameters of type A ferrite greatly. For comparison, the other types of natural ferrite, single-phase magnetite and two-phase iron minerals (ilmen-ite and magnetite), have few impurity. Thus regulation mechanism of EM parameters was absent in these ferrites. As a result, the regulation of EM parameters is advantageous to develop type A natural ferrite as excellent absorbent, lowers the reflectivity coefficients and enhances the absorbing efficiency of MAM made from it. Furthermore, the impurities in type A natural ferrite and its effects on EM parameters are very difficult to simulate in the synthesize ferrite. The carbonyl-iron powder is another kind of absorbent that is used ex-tensively in MAM. To compare the absorbing properties of these two absorbent, type A natural ferrite and carbonyl-iron powder were mixed with rubber and processed into mi-crowave absorbing sheets with the same procedures and tec

关键词： natural impure ferrite, complex permittivity, complex permeability, microwave absorbing materials.

Primary scientific results of Chang'E-1 lunar mission

在线全文

学校读者我要写书评

暂无评论

Science China Earth sciences 2010年第11期53卷 1565-1581页

作者： OUYANG ZiYuan1,2, li chunlai1, ZOU Yongliao1, ZHANG HongBo1, Lü Chang1, {3. JianZhong1, liu jianjun1, ZUO Wei1, SU Yan1, WEN WeiBin1, BIAN Wei1, ZHAO BaoChang3. WANG JianYu4, YANG JianFeng3. CHANG Jin5, WANG HuanYu6, ZHANG XiaoHui7, WANG ShiJin7, WANG Min1, REN Xin1, MU lingli1, KONG DeQing1, WANG XiaoQian1, WANG Fang1, GENG liang1, ZHANG ZhouBin1, ZHENG Lei1, ZHU XinYing1, ZHENG YongChun1, li JunDuo1, ZOU XiaoDuan1, XU Chun1, SHI ShuoBiao1, GAO YiFei1 & GAO GuanNan1 1 National Astronomical Observatories, chinese academy of sciences, Beijing 100012, China 2 {3. of geochemistry, chinese academy of sciences,{13., China 3.Xi’an {3. of Optics and Precision Mechanics, chinese academy of sciences, Xi’an 710119, China 4 Shanghai {3. of Technical Physics, chinese academy of sciences, Shanghai 200083. China 5 Purple Mountain Observatory, chinese academy of sciences, Nanjing 210008, China 6 {3. of High Energy Physics, chinese academy of sciences, Beijing 100049, China 7 Center for Space Science and Applied Research, chinese academy of sciences, Beijing 100190, China 1. National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China2. Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China3. Xi’an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Xi’an 710119 China4. Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China5. Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210008 China6. Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China7. Center for Space Science and Applied Research Chinese Academy of Sciences Beijing 100190 China

The strategic plan for the development of the unmanned chinese Lunar Exploration Program is characterized by three distinct stages: "orbiting around", "landing on" and "returning from" the Moon. The first chinese lunar probe, Chang'E-1, which was successfully launched on October 24th, 2007 at Xichang Satellite Launch Center, and guided to crash on the Moon on March 1st, 2009, at 52.3.°E, 1.50°S, in the north of Mare Fecunditatis, is the first step towards the "orbiting around" stage. The Chang'E-1 mission lasted 495 days, exceeding the expected life-span by about four months. A total of 1.3. TB raw data was received from Chang'E-1. It was then processed into 4 TB scientific data products at various levels. Many scientific results have been obtained by analyzing these data, including especially the "global lunar image from the first chinese lunar explora- tion mission". All scientific goals of Chang'E-1 have been achieved. It provides much useful materials for further advances of lunar {3. and planetary chemistry. Meanwhile, these results will serve as a firm basis for future chinese lunar missions.

关键词： lunar orbiter Chang’E-1 scientific data results

Triaxial ellipsoid models of the Moon based on the laser altimetry data of Chang'E-1

在线全文

学校读者我要写书评

暂无评论

Science China Earth sciences 2010年第11期53卷 1594-1601页

作者： WANG WenRui1,2,3. li Fei1, liu jianjun1, REN Xin2, ZOU XiaoDuan2,3. MU lingli2, YAN JianGuo1, ZOU Yongliao2, ZHANG HongBo2, Lü Chang2, liu JianZhong2, ZUO Wei2, SU Yan2, WEN WeiBin2, BIAN Wei2, WANG Min2, li chunlai2 & OUYANG ZiYuan2 1 School of Geodesy and Geomatics, Wuhan University, Wuhan 43.079, China 2 National Astronomical Observatory of chinese academy of sciences, Beijing 100012, China 3.Graduate School of chinese academy of sciences, Beijing 100049, China 1. School of Geodesy and Geomatics Wuhan University Wuhan 430079 China2. National Astronomical Observatory of Chinese Academy of Sciences Beijing 100012 China3. Graduate School of Chinese Academy of Sciences Beijing 100049 China

Lunar geodetic parameters, which play an important role in lunar exploration, can be calculated from the gravity and topography data. With the CE-1 altimetry data and LP gravity model, we calculate such geodetic parameters as the principle moment of inertia, the principle inertia axes, equatorial radius, polar radius, mean radius, flattening and offset between center of mass and center of figure (DCOM-COF). According to the CE-1 altimetry data and the above geodetic parameters, a tri-axial ellipsoid (CE-1-LAM-GEO) and a tri-axial level ellipsoid (CE-1-LAM-LEVEL) are calculated individually, providing mass center and figure center offset (DCOM-COF) and parameters more reliable in direction and magnitude.

关键词： Chang’E-1 laser altimetry data lunar ellipsoid lunar gravity

Innovative developments in lunar and planetary science promoted by China's lunar exploration

在线全文

学校读者我要写书评

暂无评论

Science China Earth sciences 2023年第11期66卷 2399-2418页

作者： chunlai li Wei YAN jianjun {3. Ziyuan OUYANG Key Laboratory of Lunar and Deep Space Exploration National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China institute of geochemistry Chinese Academy of SciencesGuiyang 550002China

As the only natural satellite of the earth, the Moon has always been the first choice for human exploration of the solar system. China's lunar exploration project(Chang'e project) was launched in 2004. At present, it has created a perfect end to the three phases of “orbiting, landing and returning”. A series of remarkable research achievements have been made on the basic issues of current lunar scientific research, such as the Earth-Moon space environment, lunar surface material, morphology,geological structure, lunar subsurface and internal structure, and the origin and evolution of the Moon, further deepening the human understanding of the Moon. This paper briefly reviews the development process of China's lunar exploration project,summarizes the main research results and scientific understanding, and finally prospects to the future development of China's lunar and planetary exploration.

关键词： Lunar exploration Lunar science Chang'e project Scientific achievements Future prospects

在线全文

学校读者我要写书评

暂无评论

小空间碎片数据库的设计与实现

计算机工程与应用 2004年第2期40卷 177-179页

作者：左维李春来刘剑刘建军中国科学院地球化学研究所中国科学院国家天文台北京100012

空间碎片对航天器的安全具有巨大的威胁,且其数量随着人类航天活动的开展仍在高速增长,空间碎片对太空的污染已经成为一个引人瞩目的环境问题。空间碎片信息源的不断丰富以及研究的进一步深入,对碎片信息的管理和共享机制提出了迫切的... 详细信息

空间碎片对航天器的安全具有巨大的威胁,且其数量随着人类航天活动的开展仍在高速增长,空间碎片对太空的污染已经成为一个引人瞩目的环境问题。空间碎片信息源的不断丰富以及研究的进一步深入,对碎片信息的管理和共享机制提出了迫切的要求。因此,建立一个开放的、易于管理和使用的小空间碎片数据库,实现数据的集成共享和规范管理是十分必要的。论文从系统的体系结构、软硬件配置、数据库结构和系统的功能实现等方面,阐述了基于3.B/S计算模式的小空间碎片数据库管理系统的设计和实现。系统运行稳定可靠,具有良好的可扩充性和维护性。该库的建立为空间碎片的研究、防护和数值建模提供了良好的数据服务,使碎片数据得到了充分而广泛的利用,进一步丰富了关于空间碎片的知识。

关键词：空间碎片数据库 B/S计算模式 ASP/ADO

在线全文

学校读者我要写书评

暂无评论

“天问二号”任务科学目标和有效载荷配置

深空探测学报（中英文） 2024年第3期11卷 304-310页

作者：李春来刘建军任鑫严韦张舟斌李海英欧阳自远中国科学院月球与深空探测重点实验室北京100101 中国科学院国家天文台北京100101

回顾了近3.年国际上小行星探测任务的科学目标和载荷配置。在总结小行星探测主要科学问题的基础上,对中国行星探测工程“天问二号”探测任务的对象选择、科学目标和有效载荷配置进行了论述。围绕实现科学目标探测,并提出了相应的科学研... 详细信息

回顾了近3.年国际上小行星探测任务的科学目标和载荷配置。在总结小行星探测主要科学问题的基础上,对中国行星探测工程“天问二号”探测任务的对象选择、科学目标和有效载荷配置进行了论述。围绕实现科学目标探测,并提出了相应的科学研究内容和有效载荷技术指标。

关键词：天问二号小行星探测科学目标有效载荷

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 sciences 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, China 2 Xi’an {3. 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 1:2.5 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 1:2.5 million. The relative geometric positioning precision of the global image is better than 240 m, and the absolute geometric positioning precision is slightly better than that of the ULCN2005 and Clementine lunar basemap (V2.0). The plane positioning precision is approximately 100-1500 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

Laser altimetry data of Chang'E-1 and the global lunar DEM model

在线全文

学校读者我要写书评

暂无评论

Science China Earth sciences 2010年第11期53卷 1582-1593页

作者： li chunlai1, REN Xin1, liu jianjun1, ZOU XiaoDuan1, MU lingli1, WANG JianYu2, SHU Rong2, ZOU Yongliao1, ZHANG HongBo1, Lü Chang1, liu JianZhong1, ZUO Wei1, SU Yan1, WEN WeiBin1, BIAN Wei1, WANG Min1, XU Chun1, KONG DeQing1, WANG XiaoQian1, WANG Fang1, GENG liang1, ZHANG ZhouBin1, ZHENG Lei1, ZHU XinYing1, li JunDuo1 & OUYANG ZiYuan1 1 National Astronomical Observatories, chinese academy of sciences, Beijing 100012, China 2 Shanghai {3. of Technical Physics, chinese academy of sciences, Shanghai 200083. China 1. National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China2. Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China

The Laser AltiMeter (LAM), as one of the main payloads of Chang'E-1 probe, is used to measure the topography of the lunar surface. It performed the first measurement at 02:22 on November 28th, 2007. Up to December 4th 2008, the total number of measurements was approximately 9.12 million, covering the whole surface of the Moon. Using the LAM data, we constructed a global lunar Digtal Elevation Model (DEM) with 3.km spatial resolution. The model shows pronounced morphological characteristics, legible and vivid details of the lunar surface. The plane positioning accuracy of the DEM is 445 m (1σ), and the vertical accuracy is 60 m (1σ). From this DEM model, we measured the full range of the altitude difference on the lunar sur-face, which is about 19.807 km. The highest point is 10.629 km high, on a peak between crater Korolev and crater Dirichlet-Jackson at (158.656°W, 5.441°N) and the lowest point is -9.178 km in height, inside crater Antoniadi (172.413.W, 70.3.8°S) in the South Pole-Aitken Basin. By comparison, the DEM model of Chang'E-1 is better than the USA ULCN2005 in accuracy and resolution and is probably identical to the DEM of Japan SELENE, but the DEM of Chang'E-1 reveals a new lowest point, clearly lower than that of SELENE.

关键词： Chang’E-1 laser altimetry lunar DEM topographic tops of the Moon