检索结果-南通市图书馆

A one-dimensional heat transfer model of the Antarctic Ice Sheet and modeling of snow temperatures at Dome A, the summit of Antarctic Plateau

在线全文

学校读者我要写书评

暂无评论

Science china Earth sciences 2010年第5期53卷 763-772页

作者： CHEN BaiLian1,3, ZHANG RenHe2. SUN ShuFen1, BIAN LinGen2. XIAO CunDe4,2.& ZHANG TingJun5 1 institute of Atmospheric physics, Chinese {2. of sciences, beijing 10002., china 2.Chinese {2. of Meteorological sciences, beijing 100081, china 3 Graduate University of Chinese {2. of sciences, {12., china 4 Cold and Arid Regions Environmental and Engineering Research institute, Chinese {2. of sciences, Lanzhou 730000, china 5 The National Snow and Ice Data Center, University of Colorado, Boulder, CO 80309-0449, USA institute of Atmospheric physics Chinese Academy of Sciences Beijing China Graduate University of Chinese academy of sciences Beijing China Chinese academy of Meteorological sciences Beijing China Cold and Arid Regions Environmental and Engineering Research institute Chinese Academy of Sciences Lanzhou China The National Snow and Ice Data Center University of Colorado Boulder USA

A vertical one-dimensional numerical model for heat transferring within the near-surface snow layer of the Antarctic Ice Sheet was developed based on simplified parameterizations of associated physical processes for the atmosphere, radiation, and snow/ice systems. Using the meteorological data of an automatic weather station (AWS) at Dome A (80°2.′S, 70°2.′E), we applied the model to simulate the seasonal temperature variation within a depth of 2. m. Comparison of modeled results with observed snow temperatures at 4 measurement depths (0.1, 1, 3, 10 m) shows good agreement and consistent seasonal variations. The model results reveal the vertical temperature structure within the near-surface snow layer and its seasonal variance with more details than those by limited measurements. Analyses on the model outputs of the surface energy fluxes show that: 1) the surface energy balance at Dome A is characterized by the compensation between negative net radiation and the positive sensible fluxes, and 2. the sensible heat is on average transported from the atmosphere to the snow, and has an evident increase in spring. The results are considered well representative for the {2.est interior Antarctic Plateau.

关键词： Antarctic Ice Sheet near-surface layer energy transfer numerical model

Progress in multi-waveband observations of supernova remnants

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2008年第9期18卷 1057-1062页

作者： Xuejuan Yang a,b, Fangjun Lua, Wenwu Tian c,d,* a Particle Astrophysics Center, institute of {2. energy physics, Chinese academy of sciences, beijing 100049, china b Department of Astronomy, beijing Normal University, beijing 100875, china c National Astronomical Observatories, Chinese academy of sciences, 2.A Datun Road, Chaoyang District, CAS, beijing 100012. china d Department of physics & Astronomy, University of Calgary, Alberta, Canada T2. 1N4 Particle Astrophysics Center Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Department of Astronomy Beijing Normal University Beijing 100875 China National Astronomical Observatories Chinese Academy of Sciences 20A Datun Road Chaoyang District CAS Beijing 100012 China Department of physics & Astronomy University of Calgary Alberta Canada T2N 1N4

The development of observational techniques has enriched our knowledge of supernova remnants. In this paper, we review the main progresses in the last decade, including new discoveries of supernova remnants and the associated (rare type of) pulsars, nucleosynthesis, the interaction between supernova remnants and molecular clouds, dust in the supernova remnants, shock physics, and cosmic ray accelerations.

关键词： Supernova remnant Observations

Investigation into the rotational bands of ^(185)Pt with the particle-rotor model

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(physics,Mechanics & Astronomy) 2011年第S1期54卷 114-118页

作者： LI GuangShun1,2. ZHOU XiaoHong1,2. ZHANG ShuangQuan3, ZHANG YuHu1 & MENG Jie3 1 institute of Modern physics, Chinese {2. of sciences, Lanzhou 730000, china 2.Graduate University of Chinese {2. of sciences, beijing 100049, china 3 School of physics and SK Laboratory of Nuclear physics & Technology, Peking University, beijing 100871, china institute of Modern physics Chinese Academy of Sciences Lanzhou China Graduate University of Chinese academy of sciences Beijing China School of physics and SK Laboratory of Nuclear physics & Technology Peking University Beijing China

Theoretical calculations have been performed for the ν9/2.[62.](i13/2. and ν7/2.[503](f7/2. bands of 185Pt in the framework of particle-rotor model. The band properties of signature splitting and configuration mixing have been analyzed. The level energy and signature splitting before the band crossing can be well interpreted by introducing triaxiality. The positive-parity yrast band is pro posed to be dominated by the ν9/2.[62.](i13/2. component, while the negative-parity band shows strong mixing of ν7/2.[503](f7/2. and ν9/2.[505](h9/2. configurations.

关键词： high-spin states particle-rotor model signature splitting configuration mixing

Study on growth and properties of novel γ-LiAlO_2.substrate

在线全文

学校读者我要写书评

暂无评论

Science china(Technological sciences) 2006年第2期49卷 188-193页

作者： zou Jun1,2. ZHOU Shengming1, XU Jun1 & ZHANG Rong3 1. Shanghai institute of Optics and Fine Mechanics, Chinese {2. of sciences, Shanghai 2.1800, china 2. Graduate School of Chinese {2. of sciences, beijing 100039, china 3. Laboratory of Solid State Microstructures and Department of physics, Nanjing University, Nanjing 2.0093, china Shanghai institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai China Graduate School of Chinese academy of sciences Beijing China Laboratory of Solid State Microstructures and Department of physics Nanjing University Nanjing China

Transparent γ-LiAlO2.single crystal has been grown by Temperature Gradient technique. The surface of the wafer annealed in O2.atmosphere at 1100°C for 70 h became opaque and Li-poor phase (LiAl5O8); while, that annealed in Li-rich atmosphere kept transparent and smooth. The full-width at half maximum value dropped to 30 arcsecs when the wafer was annealed in Li-rich atmosphere. That annealed in O2.atmosphere increased to 78 arcsec. Compared with absorption spectra, we can conclude that the 196 nm absorption peak was caused by Li vacancies and the 736 nm peak was caused by O vacancies.

关键词： γ-LiAlO2 crystal, scanning electron micrograph (SEM), absorption spectra.

Light collection of the POLAR detector

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S1期53卷 43-46页

作者： DONG YongWei,LI YanGuo,WU BoBing,ZHANG YongJie & ZHANG ShuangNan Key Laboratory of Particle Astrophysics,institute of {2. energy physics,Chinese academy of sciences,beijing 100049,china Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing China

POLAR is a compact polarimeter dedicated to measuring the polarization of GRBs between 50-350 *** light collection of 2.0 mm×6 mm×6 mm plastic bars has been simulated and optimized in order to get uniform response to X-rays at different points along one single *** to the Monte Carlo results,the amplitude uniformity strongly depends on the level of polishing of the scintillator surface and the covering.A uniformity of 89% is achieved with a prototype constructed by a non position-sensitive PMT and an array of 4×4 bars.

关键词： plastic scintillator light collection gamma-ray burst polarimeter

SVOM gamma ray monitor

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S1期53卷 40-42页

作者： DONG YongWei,WU BoBing,LI YanGuo,ZHANG YongJie & ZHANG ShuangNan Key Laboratory of Particle Astrophysics,institute of {2. energy physics,Chinese academy of sciences,beijing 100049,china Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing China

The space-based multi-band astronomical Variable Object Monitor(SVOM) mission is dedicated to the detection,localization and broad-band study of gamma-ray bursts(GRBs) and other high-energy transient *** gamma ray monitor(GRM) onboard is designed to observe GRBs up to 5 *** this instrument,one of the key GRB parameters,Epeak,can be easily measured in the hard X-ray *** can achieve a detection rate of 100 GRBs per year which ensures the scientific output of SVOM.

关键词： gamma-ray burst Epeak triple phoswich

Zircon and apatite fission track analyses on mineralization ages and tectonic activities of Tuwu-Yandong porphyry copper deposit in northern Xinjiang, china

在线全文

学校读者我要写书评

暂无评论

Science china Earth sciences 2007年第12期50卷 1787-1795页

作者： YUAN WanMing1,BAO ZengKuan2.DONG JinQuan2.GUO ZhaoJie3 & DENG Jun1 1 State Key Laboratory of Geological Processes and Mineral Resources,china University of Geosciences,{2.100083,china 2.Laboratory of Nuclear Analysis Techniques,institute of high energy physics,Chinese academy of sciences,{2. 100039,china 3 Department of Geology,Peking University,{2. 100871,china State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Beijing China Laboratory of Nuclear Analysis Techniques Institute of High Energy Physics Chinese Academy of Sciences Beijing China Department of Geology Peking University Beijing China

The mineralization ages reported in the past in the Tuwu-Yandong copper district not only are different,but also fall into the Hercynian *** study has achieved 9 zircon and 7 apatite fission track analysis *** zircon fission track ages range from 158 Ma to 2.9 Ma and the apatite ages are between 64 Ma and 140 *** mineralization accords with the regional tectonics in the copper *** consider that the zircon fission track age could reveal the mineralization age based on annealing zone temperature of 140―300℃ and retention temperature of ～2.0℃ for zircon fission track,and metallogenetic temperature of 12.―350℃ in this ore *** three mineralization epochs have been identified,i.e.,2.9―2.6 Ma,2.2.2.0 Ma and 165―158 Ma,and indicate occurrence of the min-eralization in the Indosinian and Yanshan *** to apatite fission track ages,the three tectonic-mineralizing epochs are 140―132.Ma,109―97 Ma and 64 Ma,which means age at about 100℃ after the *** three epochs lasted 146 Ma,108 Ma and about 100 Ma from ～2.0℃ to ～100℃ and trend decrease from early to *** is shown by the fission track modeling that this district underwent three stages of geological thermal histories,stable in Cretaceous and cooling both before Cretaceous and after 2. Ma.

关键词： mineralization age, tectonic epoch, fission track, zircon, apatite, Tuwu-Yandong, Xinjiang

Simulation study of real-time monitor for BEPC-Ⅱ luminosity

在线全文

学校读者我要写书评

暂无评论

Science china(Technological sciences) 2010年第5期53卷 1215-1219页

作者： SHAN Qing1,2.WU Jian2.XUE Zhen2.XU ZiZong2.HU Tao3,WANG YiFang3 & WANG XiaoLian2.1 College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 2.0016,china 2.Department of Modern physics,University of Science and Technology of china,Hefei 2.002.,china 3 institute of high energy physics,Chinese academy of sciences,beijing 100049,china College of Material Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing China Department of Modern physics University of Science and Technology of China Hefei China institute of high {2. physics Chinese Academy of Sciences Beijing China

A fast and real time luminosity monitor system will be used in the BEPC-Ⅱ(beijing Electron Positron Collider,china).Photons generated in radiative Bhabha scattering at the interaction point are transformed into charged particles,and then the luminosity of each bunch pair is measured through collecting the Cherenkov light produced by charged particles in fused *** whole process happening in the detector is *** {2. acceptance and detection threshold with the monitor accu-racy of 1% are set based on the simulation spectra of photoelectron yield calibrated by e-beam data.

关键词： luminosity BEPC-Ⅱ Cherenkov detector radiative Bhabha

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, LIU 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 institute of Geochemistry, Chinese academy of sciences, Guiyang 550002, china 3 Xi’an institute of Optics and Precision Mechanics, Chinese academy of sciences, Xi’an 710119, china 4 Shanghai institute of Technical physics, Chinese academy of sciences, Shanghai 200083, china 5 Purple Mountain Observatory, Chinese academy of sciences, Nanjing 210008, china 6 institute 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 National Astronomical Observatories Chinese Academy of Sciences Beijing China institute of Geochemistry Chinese Academy of Sciences Guiyang China Xi’an institute of Optics and Precision Mechanics Chinese Academy of Sciences Xi’an China Shanghai institute of Technical physics Chinese Academy of Sciences Shanghai China Purple Mountain Observatory Chinese Academy of Sciences Nanjing China institute of high {2. physics Chinese Academy of Sciences Beijing China Center for Space Science and Applied Research Chinese Academy of Sciences Beijing 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 2.th, 2.07 at Xichang Satellite Launch Center, and guided to crash on the Moon on March 1st, 2.09, at 52.36°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 1.37 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 sciences 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