检索结果-南通市图书馆

熊果酸的Raman光谱和红外光谱结构特征比较

在线全文

学校读者我要写书评

暂无评论

光谱学与光谱分析 2002年第6期22卷 970-972页

作者：顾柏平朱亮柯惟忠陈建伟南京中医药大学基础医学院江苏南京210029 南京中医药大学药学院江苏南京210029 南京师范大学分析测试中心江苏南京210024

本文采用HRD2型双光栅单色仪测定了熊果酸的Raman光谱 ,得到熊果酸的特征Raman光谱结构 ,采用Philips 10 0型双光栅单色仪测定了熊果酸的IR光谱 ,得到熊果酸的特征IR光谱结构 ;解析了熊果酸的Raman光谱和IR光谱与其结构特征的关系 ,确... 详细信息

本文采用HRD2型双光栅单色仪测定了熊果酸的Raman光谱 ,得到熊果酸的特征Raman光谱结构 ,采用Philips 10 0型双光栅单色仪测定了熊果酸的IR光谱 ,得到熊果酸的特征IR光谱结构 ;解析了熊果酸的Raman光谱和IR光谱与其结构特征的关系 ,确定了熊果酸的Raman光谱和IR光谱的结构特征和官能团的归属 ,给出了熊果酸的两个基本骨架特征区域 (A区 :13.6 ,13.0 ,13. 3.m- 1 ,B区 :13. 4 ,12 6 9,12 3.cm- 1 ) ;对熊果酸的Raman光谱和IR光谱作了比较研究 ,指出Raman光谱具有比IR光谱更为丰富的结构信息的特征 ,并且 ,IR光谱的主要特征峰在Raman光谱中均有对应的谱峰 ;Raman光谱的谱峰形态清晰可变 ,使熊果酸的主要结构和官能团得到准确的分析和指认 ,与IR光谱一样 ,Raman光谱是天然药物解析的有效手段之一。

关键词：熊果酸激光Raman光谱红外光谱结构解析天然药物

The definition of effective emissivity of land surface at the scale of remote sensing pixels

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1999年第23期44卷 2154-2158页

作者： LI Xiaowen and WANG Jindi Research center for Remote Sensing and GIS, Beijing normal Unirersity, Keying 100875,{3. center for Remote Sensing, Boston Univ. , MA02215, USA Research center for Remote Sensing and CIS Beijing Normal University Beijing China center for Remote Sensing Boston Univ. USA

Remote sensing (RS) of land surface temperature (LST) is a very challenging problem at the present development stage of RS science. Tremendous efforts have been devoted to atmosphere correction and temperature emissivity separation (TES) of new LST product algorithms. However, the mechanism of directionality of thermal emission from land surface remains unknown, and even worse, there are confusions on the definition of the effective emissivity of land surface at the scale of RS pixels. The mechanism of directionality of thermal emission

关键词： non-isothermal pixel effective emissivity. directionality of thermal emission.

HIGH-ENERGY PROTON IRRADIATION EFFECTS ON GaAs/Ge SPACE SOLAR CELLS

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2001年第6期14卷 463-466页

作者： R. Wang (The Key Laboratory of Beam Technology and Materials Modification of Ministry of Education, Institute of Low Energy Nuclear Physics, Beijing normal university Beijing Radiation center, Beijing {3., china) S.D. Yao (Department of Technical Phys Inst. of Energy Nucl. Phys. Beijing Normal Univ. Beijing 100875 China

This paper reports the high-energy proton irradiation effects on GaAs/Ge space solar cells. The solar cells were irradiated by protons with energy of 5-20 MeV at fluence ranging from 1×109 to 7×1013.cm-2, and then their electric parameters were measured at AM0. It was shown that the Isc, Voc and Pmax decrease as the proton energy increasing, and the degradation is relative to proton irradiation-induced defect with a level of Ec-0.41 eV in irradiated GaAs/Ge cells.

关键词： Germanium High energy physics Irradiation Protons Semiconducting gallium arsenide

Study on Thermodynamic Properties of Lithium by First-principles and Quasi-harmonic Debye Model

在线全文

学校读者我要写书评

暂无评论

Semiconductor Photonics and Technology 2010年第4期16卷 141-145页

作者： LEI Jiehong1,3. DUAN Hao2, XING Pifeng3. TANG Yongjian3.(1. Physics and Electronic Information Institute, china West normal university, Nanchong 63.002, CHN 2. Chemistry and Chemical Engineering College, Mianyang normal university, Mianyang 621000, CHN 3. Research center of Laser Fusion, china Academy of Engingeering Physics, Mianyang 621900, CHN) Physics and Electronic Information Institute China West Normal University Nanchong 637002 Chemistry and Chemical Engineering College Mianyang Normal University Mianyang 621000 Research center of Laser Fusion China Academy of Engingeering Physics Mianyang 621900

In this paper, the lattice parameter and bulk modulus of lithium(Li) at different pressures and temperatures are calculated by using the density functional theory method within the generalized gradient approximation(GGA).Through the quasi-harmonic Debye model, the thermodynamic properties of Li are predicted. The dependences of the normalized primitive cell volume V/V0 on pressure P, the variation of the thermal expansion coefficient α with pressure P and temperature T, as well as the dependences of the heat capacity Cv on pressure P and temperature T are obtained systematically in the ranges of 0~100 GPa and 0~2 000 K.

关键词： density functional theory the quasi-harmonic Debye model thermodynamic properties

XMM-Newton observation of the eclipsing binary Algol

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2011年第4期11卷 457-470页

作者： Xue-Juan Yang Fang-Jun Lu Bemd Aschenbach Li Chen Faculty of Materials Optoelectronics and Physics Xiangtan University Xiangtan 411105China Particle Astrophysics center Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Max-Planck-Institut fur Extraterrestrische Physik 85741 Garching Germany Department of Astronomy Beijing Normal University Beijing 100875 China

We present an XMM-Newton observation of the eclipsing binary Algol which contains an X-ray dark B8V primary and an X-ray bright K2IV secondary. The observation covered the optical secondary eclipse and captured an X-ray flare that was eclipsed by the B star. The XMM-Newton European Photon Imaging Camera and Reflection Grating Spectrometer spectra of Algol in its quiescent state are described by a two-temperature plasma model. The cool component has a temperature around 6.4× 106 K while that of the hot component ranges from 2 to 4.0× 107 K. Coronal abundances of C, N, O, Ne, Mg, Si and Fe were obtained for each component for both the quiescent and the flare phases, generally with upper limits for S and Ar, and upper limits for C, N, and O from the hot component. F-tests show that the abundances do not need to be different between the cool and the hot component and between the quiescent and the flare phase with the exception of Fe. Although the Fe abundance of the cool component remains constant at -0.14, the hot component shows an Fe abundance of -0.28, which increases to -0.44 during the flare. This increase is expected from the chromospheric evaporation model. The absorbing column density NH of the quiescent emission is 2.5 - 1020 cm-2, while that of the flare-only emission is significantly lower and consistent with the column density of the interstellar medium. This observation substantiates earlier suggestions of the presence of X-ray absorbing material in the Algol system.

关键词： stars abundance -- star binaries eclipsing -- stars flare -- stars indi-vidual Algol

Chemiluminescence Determination of Molybdenum by on-Line Reduction with a Flow Injection System

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2000年第5期11卷 427-430页

作者： Zhi Jia ZHU (Experimental center, Hebei normal university, Shijiazhuang 050016) Hebei normal Univ Expt Ctr Shijiazhuang 050016 Peoples R China

The chemiluminescence (CL) reaction between lucigenin (Lu) and molybdenum (III) produced by a Jones reductor was investigated using a flow injection system. On the basis of this, a novel method for the determination of trace amount of molybdenum has been established. The emission intensity was linear with molybdenum concentration in the range of 0.1-1000 ng/mL; the detection limit was 0.02 ng/mL molybdenum; the relative standard deviation was less than 2% for the determination of 0.1 ng/mL molybdenum (n=11). The method has been applied successfully to the analysis of trace molybdenum in water and steel samples.

关键词： chemiluminescence analysis reductant flow-injection molybdenum lucigenin

Risk Assessment of Aeolian Sand Disaster on Lake in Sandy Area of Inner Mongolia

在线全文

学校读者我要写书评

暂无评论

Risk Assessment of Aeolian Sand Disaster on Lake in Sandy Ar...

Induction of EROD activity in Paralichthys olivaceus by polychlorinated biphenyl CB-28

首届风险分析与危机反应国际学术研讨会

作者： Yao-Jie Yue~(1,2) Jing-Ai Wang~(1,3.*) Xue-Yong Zou~4 Pei-Jun Shi~3.1 School of Geography, Beijing normal university, 100875, Beijing,{3. 2 Key Laboratory of Regional Geography, Beijing normal university, 100875, Beijing,{3. 3.Key Laboratory of Environmental Change and Natural Disaster of Ministry of Education of{3., Beijing normal university, 100875, Beijing,{3. 4 Desert Research {13. of{3., Beijing normal university, 100875, Beijing,{3.

＜正＞It is very important to prevent lake from sand encroachment induced by aeolian sand disaster （ASD） for water resources conservation and the ecology-sound land use *** study investigated the structure and function system of ASD by systematic analysis,then index system and classification standard for comprehensive risk assessment were proposed.A case study was done in Inner Mongolia of northern china,and the results indicated that nearly 70% of the lakes receive the hazards of ASD and 45.5% lakes are seriously *** suggests that human disturbance responds to ASD significantly,and ways to reduce risk of ASD include regional land use optimization and engineering measures.

关键词： Aeolian sand disaster Lake Risk assessment Inner Mongolia

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2003年第2期22卷 281-286页

作者： WangJuying HuoChuanlin HanGengchen GuanDaoming YanQilun CollegeofChemnistryandChemicalEngineering OceanUniversityofChinaQingdao266003China NationalMarineEnvironmentalMonitoringcenter Dalian116023China InstituteofEnvironmentalScience BeijingNormalUniversityBeijing100875China

The test organisms (Paralichthys olivaceus) were exposed to CB - 28 with differentspiked concentrations. After 72 h, EROD activities in livers of the test organisms were measured. It was found that EROD activities significantly mounted up with the increase of spiked quantity. Therefore, there existed a dose-response relationship between EROD activities and specific pollutant concentrations. In the meantime, the optimal conditions for the analysis of EROD activity were discussed. The limitation of EROD activities as a monitoring parameter was also analyzed.

关键词： PCBs EROD flounder bio-effect cytochrome P-450

The　Dynamic　Behaviour　Analysis　of　Up－Conversion　Luminescence　in　ErP5O14　Glass

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Lasers 1995年第1期B4卷 73-80页

作者： CHEN Jinkai CHEN Xiaobo HUANG Zhiwei YANG Wenqing(Experiment center,Fujian normal university, Fuzhou 3.0007,{3. Physics Department,Nankai university,Tian jing 3.0071,{3.) Fujian normal Univ Fuzhou China

ＴｈｅＤｙｎａｍｉｃＢｅｈａｖｉｏｕｒＡｎａｌｙｓｉｓｏｆＵｐ－ＣｏｎｖｅｒｓｉｏｎＬｕｍｉｎｅｓｃｅｎｃｅｉｎＥｒＰ５Ｏ１４ＧｌａｓｓＴｈｅＤｙｎａｍｉｃＢｅｈａｖｉｏｕｒＡｎａｌｙｓｉｓｏｆＵｐ－Ｃｏｎｖｅｒｓｉ... 详细信息

ＴｈｅＤｙｎａｍｉｃＢｅｈａｖｉｏｕｒＡｎａｌｙｓｉｓｏｆＵｐ－ＣｏｎｖｅｒｓｉｏｎＬｕｍｉｎｅｓｃｅｎｃｅｉｎＥｒＰ５Ｏ１４ＧｌａｓｓＴｈｅＤｙｎａｍｉｃＢｅｈａｖｉｏｕｒＡｎａｌｙｓｉｓｏｆＵｐ－ＣｏｎｖｅｒｓｉｏｎＬｕｍｉｎｅｓｃｅｎｃｅ...

关键词： ErP5O(14) glass up-conversion three photon luminescence