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Vibrational Spectrum and Luminescence Properties of CaAl2.2.7∶Eu3+

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Journal of Rare Earths 1999年第2期 22-24页

作者： You Hongpeng , Hong Guangyan (Laboratory of Rare Earth chemistry and Physics, changchun {2. of applied chemistry,chinese academy of sciences, changchun 13002., china)

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关键词： Rare earths Europium CaAl2.2.7Eu3+ Vibrational spectrum Luminescence property Phonon sideband

Crystallization Behevior of Poly(3-dodecylthiophene)

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chinese Chemical Letters 1999年第5期10卷 419-420页

作者： Xiu Ying QIAO Xian Hong WANG Zhi Shen MO Hong Fang ZHANG(Polymer Physics Laboratory. changchun institute of {2. chemistry. chinese academy of sciences. changchun 13002.) Polymer Physics Laboratory Changchun Inst. of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China

The crystallization behavior of poly (3-dodecylthiophene) (P3DDT) is studied bq differential scanning calorimetry (DSC) under different cooling rates. When the methods of Jeziorny., Ozawa and a new one proposed by our laboratory are applied to describe its nonisothermal crystallization behavior, the new one is confirmed to be the best and convenient. By determining kinetic parameters, the analysis of the nonisothermal crystallization behavior is performed. According to Kissinger method, the crystallization activation energy of P3DDT is also evaluated.

关键词： nonisothermal crystallization behavior poly (3-dodecylthiophene)

Effects of annealing on structural, optical and electrical properties of Al-doped ZnO thin films

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Science china(Physics,Mechanics & Astronomy) 2004年第5期47卷 588-596页

作者： CHEN Yanwei1,2. YU Wenhua1 & LIU Yichun1,2.1. Centre for Advanced Optoelectronic Functional Material Research, Northeast Normal University, changchun 13002., china 2. Key Laboratory of Excited State Processes, {2. institute of Optics, Fine Mechanics and Physics, chinese academy of sciences, changchun 13002., china Centre for Advanced Optoelectronic Functional Material Research Northeast Normal University Changchun China Key Laboratory of Excited State Processes Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun China

In this paper, the structural, electrical and optical properties of Al-doped zinc oxide (ZnO: Al) thin films onto quartz substrates prepared by electron beam evaporation technique were studied. All samples are polycrystal with a hexagonal structure andc-axis preferred orientation. The intense UV emissions and weak deep-level green emissions were observed. The films show high transparency, conductivity and high carrier concentration. Van der Pauw measurements show that the films are n-type degenerate semiconductor. The lowest resistivity is 6.7×10?4 Ω⊙cm at room temperature. These films exhibit a carrier density above 102. cm?3. The conduction mechanism was discussed. The behavior of metallic conduction can be observed in the high temperature range.

关键词： ZnO: Al thin film, photoluminescence, electrical properties, structural properties, Van der Pauw measurement.

Magnetic properties of Jiaxian red clay sequences from northern chinese Loess Plateau and its paleoclimatic significance

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Science china Earth sciences 2005年第8期48卷 1234-1245页

作者： QIANG Xiaoke, AN Zhisheng, LI Huamei, CHANG Hong & SONG Yougui 1. SKLLQG, institute of Earth Environment, chinese academy of sciences, Xi’an 710075,{2. 2. Guangzhou institute of Geochemistry, chinese academy of sciences, Guangzhou 510640,{2. chinese academy of {2. SKLLQG Institute of Earth Environment Xi’an China chinese academy of {2. Guangzhou Institute of Geochemistry Guangzhou China

Detailed rock magnetism investigation of the Jiaxian red clay sequences indicated that there are common magnetic mineralogy properties in red clay and loess-paleosol sequences from the chinese Loess Plateau as well as the marked properties of themselves, magnetic min-erals mainly with magnetite, maghemite, hematite, and possibly limonite/goethite contributing to the magnetic behavior. Meanwhile, it is found that the strong paleosol in red clay sequences has a lower coercivity and higher content of ultra-fine ferrimagnetic grains than that of the weak pa-leosol, which is similar to loess and paleosol in upper Wucheng Loess sequences, and indicates that humid conditions and relatively strong pedogenesis play a significant role in the increase of ultra-fine magnetic minerals and transformation of the magnetic minerals. This suggests that, like Quaternary loess-paleosols, the change of characteristics of paleoclimatic conditions of the late Tertiary red clay deposits is fluctuant. In addition, the results of magnetic hysteresis properties show that the applied saturated field for samples from the Jiaxian red clay sequences is higher than that of the samples from eastern and southern chinese Loess Plateau. It is obviously shown that there exist more hard magnetic minerals and relatively weak biochemical processes in the Jiaxian red clay sequences on northern chinese Loess Plateau. We conclude that the paleocli-matic environment is different between northern and eastern/southern chinese Loess Plateau, and it should be more arid in northern chinese Loess Plateau.

关键词： northern chinese Loess Plateau, red clay, magnetic property, paleoclimatic significance.

In-situ FTIR Spectroelectrochemical Study of Chromium Hexacyanoferrate on Glassy Carbon Electrode

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chinese Chemical Letters 1998年第9期9卷 851-854页

作者： Ai Li BO (Laboratory of Electroanalytical chemistry, changchun {2. of applied chemistry, chineseacademy of sciences, changchun 13002.) Xiang Qin LIN (Department of chemistry, University of Science and Technology of china, Hefei 2.002.) Lab. of Electroanalytical chemistry Changchun Inst. of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China Department of chemistry Univ. of Sci./Technology of China Hefei 230026 China

Chromium hexacyanoferrate (CrHCF) modified grassy carbon electrode (GC) in different electrolytes was studied by cyclic voltammetry and in situ FTIR spectroelectrochemistry. The results indicate that the behavior of CrHCF firm can be understood in term of two structures: Cr1/3Cr(III)Fe(II)(CN), and MCr(III)Fe(II)(CN)(6). Besides,the film exists in amorphous state: the outer layer is porous film, while the inner layer is relatively compact. According to the electrochemical reaction of CrHCF, the lattice can contract and expand with the cations' diffusion.

关键词： chromium hexacyanoferrate grassy carbon electrode electrochemistry in situ FTIR spectroelectrochemistry

ANALYSIS OF THE EXPANSION OF THE BUILT-UP AREA OF DALIAN CITY

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chinese Geographical Science 2002年第4期12卷 373-377页

作者： CHANG Li-ping,ZHANG Shu-wen(changchun institute of Geography,t he{2.,changchun 130012.P.R.china) changchun institute of Geography the Chinese Academy of Sciences Changchun P. R. China

With the astounding development and gradual improvement of remote sensing technology,as an advanced science technology,it is used to pro vide multi-temporal,large scope re al-time information for land-use dynamic change,and also is one of the best efficient m ethods for studying the earth resour ces and *** sensing image has its characteristics of ample inform ation and reflecting the objective r *** paper uses multi-temp oral TM images in1986,1996and 2.00,and relevant sta tistic data to analyze land-use chan ges of Dalian City in Liaoning Provin ce of Chi-na over ten years by means of the corre lation analysis *** results have shown that two methods could con-formably reflect the present land-u se *** is closely c orrelative to natural factors and ec onomic *** in recent 2.years,under the influence of the reform and open-up policy,Dalian,as a specifi c coast city,is becoming an international m etropolis.

关键词： land-use change remote sensing driving force dalian city

Diffraction Properties of Field Adjustable Polymer Network Stabilized Liquid Crystal Grating

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chinese Journal of Lasers 1999年第4期8卷 20-25页

作者： REN Hongwen LING Zhihua CHU Zhensheng * HUANG Ximin (North Liquid Crystal R & D Center, changchun institute of Physics,{2., changchun 13002., china * EL Research Lab. changchun institute of Physics, chinese academy 中科院长春物理所吉林长春 130021 中科院长春物理所吉林长春

A new diffraction grating mode has been proposed. This grating is formed by applying of a spatially periodic electric field to a polymer network stabilized uniformly aligned liquid crystal layer. Due to the electro optic properties of the polymer network stabilized liquid crystal layer, the grating type is electrically adjustable, i.e. it presents amplitude, phase or amplitude phase type depending on the applied voltages. Experimental results show that the number of visible diffraction orders can be adjusted easily, and even be closed at the same time. The detail fabrication process and experimental results will be presented.

关键词： nematic liquid crystal polymer network stabilized liquid crystal phase retardation grating

Research on Nanometer Technique and Low-Work-Loss Sensor

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稀有金属材料与工程 2006年第S3期 110-112页

作者： Lan Wang~1 Yayan Liu~1 Yifei Yang~(1,2. Jingwen He~1 (1.changchun institute of {2. chemistry,chinese academy of sciences,changchun 13002.,china) (2.Graduate School of chinese academy of sciences,Beijing 100080,china)

The preparation process of the CO gas sensor used at normal temperature is *** electric conductance of this type of sensor evolved oscillation from regularly when the sensor is exposed to low level CO *** gas sensing mechanism was investigated by its crystalline *** mechanism of information sensing,which was the concurrence of the grain boundary barrier control and the crystal surface control,is discussed.

关键词： nanometer technique low-work-loss sensor

THE STRUCTURAL CHARACTERIZATION OF TRITERPENOID SAPONINS FROM chinese MEDICINAL HERBS USING ESI-MS~N

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质谱学报 1999年第Z1期 49-50页

作者： CUI Meng, LIU Shuying, SONG Fengrui, SUN Weixing (changchun institute of {2. chemistry, chinese academy of sciences, changchun 13002., china)