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Search Results: 1 - 10 of 12178 matches for " MO Chong-Gui "
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Chong-Gui Ren
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810009645
Abstract: There are two independent molecules in the asymmetric unit of the title compound, C15H12Cl2N2O2. The dihedral angle between the two benzene rings is 27.6 (4)° in one molecule and 16.4 (4)° in the other. Both molecules adopt an E configuration about the C=N bonds. In the crystal structure, molecules are linked through intermolecular N—H...O hydrogen bonds, forming chains in the a-axis direction.
Chong-Gui Ren
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809020820
Abstract: In the title compound, C14H10Cl2N2O3, the dihedral angle between the two benzene rings is 5.1 (2)°. The molecule adopts an E configuration with respect to the C=N bond and an intramolecular O—H...N interaction is present. In the crystal structure, molecules are linked through intermolecular N—H...O and O—H...O hydrogen bonds.
Chong-Gui Ren
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809020819
Abstract: There are two independent Schiff base molecules in the asymmetric unit of the title compound, C13H10ClN3O2. The dihedral angles between the benzene and pyridine rings are 12.8 (2) and 1.9 (2)° in the two molecules. Intramolecular O—H...N hydrogen bonds are observed. Molecules are linked into centrosymmetric R44(26) motifs by N—H...O and N—H...N interactions.
Electrical Properties of CuO―doped SrFe0.9Sn0.1O3― δ Thick Film NTC Thermistors
YUAN Chang-Lai,WU Xiu-Fang,LIU Xin-Yu,HUANG Jing-Yue,LI Bo,LIANG Mei-Fang,MO Chong-Gui
无机材料学报 , 2011, DOI: 10.3724/sp.j.1077.2011.00387
Abstract: CuO―doped SrFe0.9Sn0.1O3― δ (CSFS) thick―film negative temperature coefficient (NTC) thermistors ( 20mol%, 30mol%, 40mol%, 50mol% ) were prepared by the screen printing method. The microstructures and electrical prop erties of CSFS thick films were determined. With the increase of CuO content, the surface morphology of thick films becomes denser. The room―temperature resistance values gradually decreases to about 0.46 M Ω and the thermistor― constant values are basically constant at around 3300 K. After the addition of CuO, SrFe0.9Sn0.1O3― δ is decomposed into various SrFe1― xSn xO3― δ ( 0.1< x<1 ) phases. By two― RQ series equivalent circuit model, impedance characteristics of the thick film containing 40mol% CuO content are investigated over the measured temperature range of 25–250 It is found that the total thick―film resistance is mainly attributed to the contribution of grain and grain boundary resistances, both of which show the typical NTC thermistor characteristics. Furthermore, the complete match of peak frequencies between the imaginary parts of impedance and electric modulus suggests that delocalized conduction is the main conduction mechanism in the thick―film NTC thermistors.
A Research on the Variable Selection of Forest Volume Least Square Estimation Based on RS and GIS

LI Chong-gui,ZHAO Xian-wen,

遥感学报 , 2001,
Abstract: The optimum variable selecting method on the forest volume quantitative estimation based on RS and GIS through the principle of least square is studied. The law of the variable selection on forest volume estimation is analyzed in detail by means of the real example, at the same time the predicting potentiality of forest volume through LS estimation is also discussed. The method has some guiding significances for the practical job.
Study on the Sample Plot Distribution and Abnormal Sample Plot Probe in Monitoring Area with Principal Components Analysis

LI Chong-gui,ZHAO Xian-wen,

遥感技术与应用 , 2006,
Abstract: In this paper,on the basis of thinking of the harm to principal component analysis from the multi-correlation between the factors of remote sensing and GIS depicting the sample plot in the monitoring area,through the selection of variable screening,the main factors of remote sensing and GIS depicting sample plot is determined in the monitoring area.The distribution of sample plots and the detection of abnormal sample plots in monitoring area are studied by means of principal component analysis according to these factors.Comparing the results of thinking of the multi-correlation before and latter and the practical distribution of sample plots in the monitoring area,the harm from multi-correlation to principal component analysis and how to using principal component analysis to comprehend the distribution of sample plot in monitoring area are studied systematically.
An Application Research of Cluster Analysis on Sample Plot Classification in Monitoring Area

LI Chong-gui,ZHAO Xian-wen,

遥感学报 , 2006,
Abstract: In order to establish the forest canopy density and stock volume estimation equation based on remote sensing and GIS in the monitoring area,it's needed to sample certain amounts of representative sample plots.How to rationally select certain amounts of representative sample plots belongs to the problem of multi-objective optimization.It's hard to do in practical work because of the heavy calculation workload from the selecting by certain optimizing standards with all the combination method according to the known amounts of sample plots in monitoring area.Therefore,to classify the sample plots firstly and then select certain representative ones is needed.Because of the manifold of statistic measuring distance between sample plots and concrete clustering method,different categorized results appeared in the same monitoring area result in different statistic and clustering methods.Designing different factors of remote sensing and GIS that influencing the estimation of canopy density and stock volume, there will be a large difference in classifying results.To a specific monitoring area,the influencing law of different factors to classifying is studied systematically by means of computer simulation.Meanwhile how to choose the statistic measuring distance between sample plots and clustering methods in practical work is also studied in this paper.The results can be useful to real work.
Josephson effect in ferromagnetic d-wave superconductor/ferromagnet/ferromagnetic d-wave superconductor junctions

Jin Xia,Dong Zheng-Chao,Liang Zhi-Peng,Zhong Chong-Gui,

物理学报 , 2013,
Abstract: By solving a self-consistent equation for the ferromagnetic d-wave superconducting gap and the exchange energy, we study the Josephson current in the ferromagnetic d-wave superconductor/ferromagnet/ferromagnetic d-wave superconductor junctions. In the Josephson critical current, there are two oscillation components with different periods. It is found that the short-period component can be separated from the long-period one by increasing the exchange energy in ferromagnet and the barrier strength at the ferromagnet/ferromagnetic d-wave superconductor interface, and vice versa. Under a certain thickness for the ferromagnet, exchange energy for the ferromagnetic d-wave superconductor may increase the critical current in the case of a parallel alignment of the magnetization in the ferromagnetic d-wave superconductor.
Magnetoelectric coupling and magnetoelectric properties of single-phase ABO3 type multiferroic materials

Zhong Chong-Gui,Jiang Qing,Fang Jing-Huai,Ge Cun-Wang,

物理学报 , 2009,
Abstract: The anomalies in both the dielectric constant and loss tangent occur at fixed temperature close to the magnetic ordering transition, which have been observed experimentally in multiferroic pervoskite YMnO3 and BiMnO3, indicating coupling between the magnetism and dielectric properties. In this paper, by analyzing the magnetoelectric coupling between magnetic and ferroelectric subsystems, an appropriate coupling term related to a combination of electric polarization and spin correlation is added to system Hamilton expression, Then apply the soft-mode theory for electric subsystem and mean-field approximation under Heisenberg model for magnetic subsystem,magnetoelectric properties have been investigated, including the change of polarization, dielectric constant induced by external magnetic field, and the change of magnetization induced by external electric field. We also make some qualitative comparison and analysis between our results and the experimented ones and give a reasonable interpretation of magnetoelectricity phenomenon in some multiferroic pervoskite materials.
Electric-field-induced magnetization in 1-3 type multiferroic nanocomposite thin film

Zhong Chong-Gui,Jiang Qing,Fang Jing-Huai,Jiang Xue-Fan,Luo Li-Jin,

物理学报 , 2009,
Abstract: 运用Landau-Devonshire热力学唯像理论,考虑铁电相和铁磁相的电致伸缩、磁致伸缩效应以及产生于铁电/铁磁和薄膜/基底界面的弹性应力作用,两次重整介电和磁作用系数得到了这种多铁系统在Landau自由能函数下的本征二次方磁电耦合形式,从而研究了外延1-3型纳米多铁复合薄膜中极化、磁化随薄膜厚度、温度的变化以及该薄膜中外加电场诱导的磁化变化.结果表明薄膜平面内的应压力的弛豫使得磁化强度和极化强度随薄膜厚度的增加而减少,外加电场不仅能诱导铁电相极化场翻转,而且由于铁电和铁磁相界面竖直方向的弹性耦合导致
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