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A study on surface symmetry and interfacial enhancement of SrTiO_3 by second harmonic generation

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Science China(Physics,Mechanics & Astronomy) 2013年第12期56卷 2370-2376页

作者： ZHAO RuiQiang JIN KuiJuan GUO HaiZhong lu huibin YANG GuoZhen Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences

The symmetry of the surfaces of SrTiO3 and slightly Nb-doped SrTiO3 crystals was investigated by the optical reflected second harmonic generation technique. The good agreement between experimental and theoretical results of the second harmonic in- tensity dependence on the azimuth angle indicates that the SrTiO3 （001） surface is with 4ram symmetry and the Nb-doped SrTiO3 （111） surface with 3m symmetry. The measurements of the polarization dependent second harmonic intensity confirm that conclusion. The enhancement of the surface polarization in the structure of SrTiO3 capped La0.9Sr0.1MnO3 films compared with that in the La0.9Sr0.1MnO3 films has been obtained.

关键词： perovskite oxides surface crystal symmetry second harmonic generation

Room-temperature epitaxial growth of V_2O_3 films

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Science China(Physics,Mechanics & Astronomy) 2014年第10期57卷 1866-1869页

作者： LIU XiangBo lu huibin HE Meng JIN KuiJuan YANG GuoZhen Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences

Herein we report the room-temperature epitaxial growth of V203 films by laser molecule beam epitaxy. X-ray diffraction pro- files show the room-temperature epitaxial V2O3 films orient in the [ 110] direction on α-Al2O3 （0001） substrates. Atomic force microscopy measurements reveal that the ultra-smooth surfaces with root-mean-square surface roughness of 0.11 nm and 0.28 nm for 10-nm-thick and 35-nm-thick V2O3 film, respectively. X-ray photoelectron spectroscopy results indicate the V3＋ oxida- tion state in the films. Typical metal-insulator transition is observed in films at about 135 K. The resistivities at 300 K are ap- proximately 0.8 mΩ cm and 0.5 mΩ cm for 10-rim-thick and 35-nm-thick V203 film, respectively.

关键词： room-temperature epitaxy V2O3 metal-insulator transition

Low-field positive and high-field negative magneto-resistances in multiphase Fe-oxide thin films at room temperature

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Chinese Science Bulletin 2007年第12期52卷 1607-1611页

作者： ZHAO Kun XING Jie LIU YuZi ZHAO JianGao lu huibin Department of Mathematics and Physics China University of Petroleum Beijing 102249 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100080 China Intemational Center for Materials Physics Chinese Academy of Sciences Shenyang 110016 China

Multiphase Fe-oxide thin films are fabricated on glass substrates by a facing-target sputtering tech- nique. X-ray diffraction and X-ray photoelectron spectroscopy reveal that Fe, Fe3BO4, γ -Fe2BO3B and FeO coexist in the films. High resolution transmission electron microscopy shows the well-defined colum- nar grain structure with the unoxidized Fe as the core and iron-oxide as the shell. The low-field positive and high-field negative magnetoresistances coexist in such a system at room temperature, which can be explained by considering a shell/core model. Nonlinear current-voltage curve and photovoltaic effect further confirm the tunneling-type conduction.

关键词：磁致电阻多相铁氧薄膜磁性反应溅射法

Parallel detection and quantitative analysis of specific binding of proteins by oblique-incidence reflectivity difference technique in label-free format

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Science China(Physics,Mechanics & Astronomy) 2014年第11期57卷 2039-2042页

作者： DAI Jun LI Lin HE LiPing RUAN KangCheng lu huibin JIN KuiJuan YANG GuoZhen Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences Key Laboratory of Proteomics Institute of Biochemistry and Cell BiologyShanghai Institute for Biological SciencesChinese Academy of Sciences Collaborative Innovation Center of Quantum Matter

In this work,we parallelly detected the specific binding between microarray targets including 12 different kinds of proteins and the probe solution containing five corresponding antibodies and quantitatively analyzed the interactions between CDH13 and solution phase anti-CDH13 at six different probe concentrations by oblique-incidence reflectivity difference(OIRD)method in label-free *** detection sensitivity reached 10 ng/*** experimental results indicate that the OIRD method is a promising and competing technique not only in research work but also in clinic.

关键词： label format oblique reflectivity incidence spots quantitatively competing challenge finger

Detection of hybridization of protein microarrays using an oblique-incidence reflectivity difference method

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Science China(Physics,Mechanics & Astronomy) 2010年第7期53卷 1230-1233页

作者： lu Heng WEN Juan WANG Xu YUAN Kun lu huibin ZHOU YueLiang JIN Kui-Juan YANG GuoZhen LI Wei RUAN KangCheng Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Key Laboratory of Proteomics Institute of Biochemistry and Cell BiologyShanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai 200031China

Mouse-Immunoglobulin G(mouse-IgG) with different concentrations in a range from 1000 to 0.0128 μg/mL and a specific hybridization with goat anti-mouse IgG were detected successfully by using an oblique-incidence reflectivity difference(OI-RD) *** detection signals,consisting of an imaginary part(Im{Δp-Δs}) and a real part(Re{Δp-Δs}) of OI-RD,were obtained *** detection results of hybridization by OI-RD were in accord with that of traditional fluorescent *** particular,we label-freely detected the washed mouse-IgG microarray with a series of concentrations and acquired a linear correlation between OI-RD intensities and the protein concentrations in logarithmic *** detection sensitivity of OI-RD can reach 14 *** experimental results suggest that the OI-RD method has potential applications in proteomics and clinical diagnosis.

关键词： protein microarrays oblique-incidence reflectivity difference(OI-RD) label-free detection

Label-free detection of hybridization of oligonucleotides by oblique-incidence reflectivity difference method

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Science China(Physics,Mechanics & Astronomy) 2010年第8期53卷 1434-1437页

作者： YUAN Kun WANG Xu lu Heng WEN Juan lu huibin ZHOU YueLiang JIN Kui-Juan YANG GuoZhen LI Wei RUAN KangCheng Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Key Laboratory of Proteomics Institute of Biochemistry and Cell BiologyShanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai 200031China

The microarrays of 20-base oligonucleotide with different concentrations are detected before and after hybridization by the oblique-incidence reflectivity difference (OI-RD) method. The experimental results prove that OI-RD is a label-free method which can not only distinguish the concentration difference of oligonucleotides before and after the hybridization but also detect the hybridization of short oligonucleotides. At present the OI-RD method can detect 0.39 μmol/L 20-base oligonucleotide or less. These results suggest that the OI-RD method is a promising and potential technique for label-free detection of biological microarrays.

关键词： oblique-incidence reflectivity difference microarray detection label-free detection oligonucleotides microarray

Label-free and real-time detection of antigen-antibody interactions by Oblique-incidence Reflectivity Difference(OIRD) method

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Science China(Physics,Mechanics & Astronomy) 2012年第9期55卷 1585-1588页

作者： HE LiPing SUN Yue DAI Jun WANG JingYi lu huibin WANG ShuFang JIN KuiJuan ZHOU YueLiang YANG GuoZhen College of Physics Science and Technology Hebei University Baoding 071002 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

We label-free and real-time detected three interaction processes of antigen-antibodies,Human Immunoglobulin G(IgG),Rabbit IgG,and Mouse IgG as the targets,and Goat Anti-human IgG,Goat Anti-rabbit IgG,and Goat Anti-mouse IgG as the probe,by the Oblique-incidence Reflectivity Difference(OIRD) *** interaction dynamic curves of the OIRD signal,corresponding to the interaction processes of antigen-antibodies,are *** reaction times from beginning to equilibrium state are about 1800,900,and 1200 s for Human IgG,Rabbit IgG,and Mouse IgG,*** experimental results demonstrate that the OIRD method not only can distinguish biomolecular interactions,but also can be used in real-time detection of interactions and dynamic processes of biomolecules.

关键词： Oblique-incidence Reflectivity Difference (OIRD) label-free and real-time detection dynamic process of biomolecularinteraction

Oxygen vacancies effects on phase diagram of epitaxial La1-xSrxMnO3 thin films

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Science China(Physics,Mechanics & Astronomy) 2017年第5期60卷 67-72页

作者： Qian Wan KuiJuan Jin QingQing Li YaQing Feng Can Wang Chen Ge Meng He huibin lu HaiZhong Guo XiaoLong Li YuPing Yang GuoZhen Yang Institute of Physics Chinese Academy of SciencesBering 100190China University of Chinese Academy of Sciences Beijing 100049China Collaborative Innovation Center of Quantum Matter Beijing 100190China School of Science Minzu University of ChinaBeijing 100081China Shanghai Synehrotron Radiation Facility(SSRF) Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201204China

We investigated the effects of oxygen vacancies on the structural, magnetic, and transport properties of Lal-xSrxMnO3 （x=0.1, 0.2, 0.33, 0.4, and 0.5） grown around a critical point （without/with oxygen vacancies） under low oxygen pressure （10 Pa） and high oxygen pressure （40 Pa）. We found that all films exhibit ferromagnetic behavior below the magnetic critical temperature, and that the films grown under low oxygen pressures have degraded magnetic properties with lower Curie temperatures and smaller magnetic moments. These results show that in epitaxial La1-xSrxMnO3 thin films, the magnetic and transport properties are very sensitive to doping concentration and oxygen vacancies. Phase diagrams of the films based on the doping concentration and oxygen vacancies were plotted and discussed.

关键词： Lal-xSrxMnO3 thin films phase diagram oxygen vacancies

欠定盲源分离和共空间模式特征的脑电信号分类研究

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生物医学工程学杂志 2016年第2期33卷 216-220页

作者：卢辉斌燕山大学信息科学与工程学院秦皇岛066004

眼电伪迹和噪声是导致脑电信号低信噪比的重要原因,会降低运动想象任务的分类性能。提出一种改进的基于少通道数的分块欠定盲源分离的滤波方法,通过分块的思想把非平稳的脑电信号变为近平稳的分块信号,利用二阶欠定混合矩阵盲识别方法... 详细信息

眼电伪迹和噪声是导致脑电信号低信噪比的重要原因,会降低运动想象任务的分类性能。提出一种改进的基于少通道数的分块欠定盲源分离的滤波方法,通过分块的思想把非平稳的脑电信号变为近平稳的分块信号,利用二阶欠定混合矩阵盲识别方法估计混合分离矩阵,然后通过基于最小均方误差的波速形成器提取源信号,接着通过得分准则自动去除噪声信号并重构信号,最后提取共空间模式特征进行分类。想象运动的真实脑电信号实验仿真结果表明,分块欠定盲源分离方法能很好地恢复源信号并能有效地去除眼电等伪迹和噪声,共空间模式特征则提高了想象任务识别率。

关键词：脑机接口运动想象脑电图欠定盲源分离共空间模式