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Effect of the Transition Sublayers at the Interfaces on Giant Magnetoresistance

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Chinese Physics Letters 1998年第8期15卷 597-599页

作者： XU Hui-ying yu wen-xue MAI Zhen-hong Institute of Physics&Center for Condensed Matter Physics Chinese Academy of SciencesBeijing 100080 Department of Material Science Jilin UniversityChangchun 130023

A thin transition sublayer between the ferromagnetic and the nonmagnetic sublayers is introduced for describing the interface roughness and/or the interface *** on the Kubo formalism in the real spaces,the giant magnetoresistance effects for both the cases of the structures with and without the transition sublayers at the interfaces are *** numerical results show that the transition sublayers induce a phase shift on the curves of magnetoresistance(MR)vs the thicknesses of the ferromagnetic and the nonmagnetic sublayers,and there exists a critical thickness dc of the ferromagnetic sublayer,the ratio of the MR values for the structures with and without the transition sublayers at the interfaces changes at the critical thickness.

关键词： ferromagnetic transition magnetoresistance

Asymmetrical Spin-Polarized Tunneling in a Composed-Barrier Magnetic Tunnel Junctions Under the Forward and Reverse Biases

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Chinese Physics Letters 1999年第12期16卷 919-921页

作者： XU Hui-ying yu wen-xue KANG Jian MAI Zhen-hong Institute of Physics&Center for Condensed Matter Physics Chinese Academy of SciencesBeijing 100080 Department of Physics Peking UniversityBeijing 100871

Based on the two-band model and nearly-free-electron approximation, the tunnel current, conductance and mag-netoresistance of the composed-barrier magnetic tunnel junctions ( MTJ ) under the forward and reverse biases are discussed, respectively, and the numerical results are compared with the experimental results of the single-barrier MTJ . We find that there exists an asymmetrical spin-polarized tunneling in this structure under the forward and reverse biases. It suggests that this type of MTJ will provide novel functions to the potential applications of traditional types of MTJ.

关键词： tunneling polarized approximation

LUPUS NEPHRITIS COMPLICATED WITH MALIGNANT HYPERTENSION:FROM RENAL VASCULAR PATHOLOGY TO CLINICAL RELEVANCE

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Chinese Medical Sciences Journal 2008年第2期23卷 81-87页

作者： Jian-ling Tao Hang Li yu Tang yu-bing wen xue-wang Li Department of Nephrology Peking Union Medical College Hospital Chinese Academy of Medical Sciences ＆ Peking Union Medical College Beijing 100730

Objective To investigate the clinical and pathological characteristics of lupus nephritis patients complicated with malignant *** We retrospectively studied 19 patients with lupus nephritis complicated with malignant hypertension who underwent renal biopsy between January 2002 and December *** Of 19 patients,3 were men and 16 were women,with a mean age of 24.4±7.7 years *** had positive antinuclear antibodies and low serum complement was found in 13 *** were anemic and 12 of them were *** renal function was found in 17 patients with an average serum creatinine of 184.5±88.9 μmol/*** intrarenal arteriolar lesion was found in all *** patients had lupus vasculopathy,11 patients had renal thrombotic microangiopathy lesion,2 had severe *** patients received steroids and immunosuppressive drugs,15 received angiotensin-converting enzyme inhibitor(ACEI)/angiotensin receptor blocker(ARB)with resultant well-controlled blood *** and hemolytic anemia resolved *** renal function improved or recovered in 14 of 17 patients,and 3 developed end-stage renal disease on maintenance *** Severe intrarenal vascular lesion complicated with renal nephritis parallels clinical manifestation of malignant *** pathology is the key of treatment strategy emphasizing on the significance of renal vascular involvement and *** the basis of immunosuppressive drugs and steroids to control systemic lupus activity,timely initiation of ACEI/ARB could be of benefit to blood pressure control and long term renal survival.

关键词： lupus nephritis malignant hypertension renal pathology renal vascular involvement thrombotic microangiopathy

Crystallization Behavior and Mechanical Properties of Poly(vinylidene fluoride)/multi-walled Carbon Nanotube Nanocomposites

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Chemical Research in Chinese Universities 2010年第3期26卷 491-495页

作者： XU yue ZHENG Wei-tao yu wen-xue HUA Li-gui ZHANG yu-jie ZHAO Zhu-di Key Laboratory of Automobile Materials of Ministry of Edueation Test Science Experiment Center Jilin University Changchun 130012 P. R. China Jilin Province Product Quality Supervision Test Institute Changchun 130022 P R. China

Poly（vinylidene fluoride）（PVDF）/multi-walled carbon nanotube（MWCNT） nanocomposites were prepared by means of ultrasonic dispersion method. X-ray diffraction（XRD） results indicate that incorporating MWCNTs into PVDF caused the formation of β phase. A thermal annealing at 130 ℃ confirmed that the β phase was stable in the nanocomposites. Differential scanning calorimetry（DSC） results indicate that the melting temperature slightly increased while the heat of fusion markedly decreased with increasing MWCNT content. The tensile strength and modulus of PVDF were improved by loading the MWCNTs. The scanning electron microscopy（SEM） observations showed that MWCNTs were uniformly dispersed in the PVDF matrix and an interfacial adhesion between MWCNT and PVDF was achieved, which was responsible for the enhancement in the tensile strength and modulus of PVDE.

关键词： Multi-walled carbon nanotube Poly(vinylidene fluoride) Composite Crystalline structure Mechanical property

Poly(vinylidene fluoride)/Clay Nanocomposites by Melt Compounding

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Chemical Research in Chinese Universities 2008年第1期24卷 116-119页

作者： SONG yu-ming ZHAO Zhu-di yu wen-xue ZHENG Wei-tao LI Bo YANG Xiao-wei CHEN Xin-fang School of Materials Science and Engineering Key Lab of Automobile Materials of MOE Jilin University Changchun 130012 P. R. China China-Japan Union Hospital of Jilin University Changchun 130031 P. R. China Solvay（Shanghai） Co. Ltd. Shanghai 200131 P. R. China

The crystalline structures, morphologies, and mechanical properties of poly（vinylidene fluoride）/clay nanocomposites were studied using X-ray diffraction（XRD）, transmission electron microscopy（TEM）, Fourier transform infrared spectroscopy（FTIR）, polarized optical microscopy（POM）, and tensile tests. The results of XRD and TEM show that organoclays are dispersed in the poly（vinylidene fluoride）（PVDF） matrix. A clay-induced crystal transformation from α-phase to β-phase of PVFD was confirmed by XRD and FTIR. Clay layers restricted the growth of spherulite. The tensile tests indicate that the tensile modulus and yield strength as well as the elongation at break decrease when clay is loaded.

关键词： Poly(vinylidene fluoride) Nanocomposite Crystalline structure Morphology Mechanical property

Morphology and formation mechanism of bainite carbide

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材料科学与工程（中英文版） 2008年第12期2卷 58-64页

作者： LIU Zong-chang WANG Hai-yan LI wen-xue REN Hui-ping, DUAN Bao-yu LI wen-xue REN Hui-ping DUAN Bao-yu School of Material and Metallurgy Inner Mongolia University of Science and Technology Baotou 014010 China

Targeting TrkB–PSD-95 coupling to mitigate neurological disorders

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Neural Regeneration Research 2025年第3期20卷 715-724页

作者： Xin Yang yu-wen Alvin Huang John Marshall Department of Molecular Biology Cell Biology and BiochemistryBrown UniversityProvidenceRIUSA Department of Neurology Warren Alpert Medical School of Brown UniversityProvidenceRIUSA Center for Translational Neuroscience Robert J.and Nancy D.Carney Institute for Brain Science and Brown Institute for Translational ScienceBrown UniversityProvidenceRIUSA

Tropomyosin receptor kinase B(TrkB)signaling plays a pivotal role in dendritic growth and dendritic spine formation to promote learning and *** activity-dependent release of brain-derived neurotrophic factor at synapses binds to pre-or postsynaptic TrkB resulting in the strengthening of synapses,reflected by long-term ***,the association of postsynaptic density protein-95 with TrkB enhances phospholipase Cγ-Ca^(2+)/calmodulin-dependent protein kinaseⅡand phosphatidylinositol 3-kinase-mechanistic target of rapamycin signaling required for long-term *** this review,we discuss TrkB-postsynaptic density protein-95 coupling as a promising strategy to magnify brain-derived neurotrophic factor signaling towards the development of novel therapeutics for specific neurological disorders.A reduction of TrkB signaling has been observed in neurodegenerative disorders,such as Alzheimer's disease and Huntington's disease,and enhancement of postsynaptic density protein-95 association with TrkB signaling could mitigate the observed deficiency of neuronal connectivity in schizophrenia and *** with brain-derived neurotrophic factor is problematic,due to poor pharmacokinetics,low brain penetration,and side effects resulting from activation of the p75 neurotrophin receptor or the truncated TrkB.T1 *** TrkB agonists and antibodies that activate TrkB are being intensively investigated,they cannot distinguish the multiple human TrkB splicing isoforms or cell type-specific *** TrkB–postsynaptic density protein-95 coupling provides an alternative approach to specifically boost TrkB signaling at localized synaptic sites versus global stimulation that risks many adverse side effects.

关键词： Angelman syndrome autism brain-derived neurotrophic factor depression neurodegenerative disorder neurodevelopmental disorder postsynaptic density protein-95 synaptic plasticity TrkB

聚偏氟乙烯/碳纳米管纳米复合材料的制备和表征

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高分子材料科学与工程 2010年第6期26卷 141-144页

作者：张宇洁赵竹第于文学吉林大学材料科学与工程学院吉林长春130012

采用超声波分散法制备了聚偏氟乙烯(PVDF)/多壁碳纳米管(MWCNT)复合材料。利用扫描电子显微镜、差示扫描量热法和傅立叶变换红外光谱等方法研究了复合材料的形态,考察了MWCNT用量对复合材料结晶行为和力学性能的影响。结果表明,通过超... 详细信息

采用超声波分散法制备了聚偏氟乙烯(PVDF)/多壁碳纳米管(MWCNT)复合材料。利用扫描电子显微镜、差示扫描量热法和傅立叶变换红外光谱等方法研究了复合材料的形态,考察了MWCNT用量对复合材料结晶行为和力学性能的影响。结果表明,通过超声处理,PVDF和MWCNTs之间产生了相互作用,复合体以球状的形式存在。MWCNTs的引入导致具有压电性的β相形成和屈服强度的提高。根据实验结果,对PVDF/MWCNT复合球体和β相的形成机理提出了可能的解释。

关键词：复合材料多壁碳纳米管聚偏氟乙烯超声处理

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带有触觉的空间机械臂操控未知载荷特性识别

宇航学报 2016年第10期37卷 1215-1221页

作者：侯月阳卢山于学文王奉文上海航天控制技术研究所上海201109 上海市空间智能控制技术重点实验室上海201109

为在线准确辨识载荷特性参数,提出一种利用关节力矩和触觉传感信息进行未知载荷特性参数辨识的方法。该方法基于牛顿-欧拉方程,采用归一化最小均方误差法进行自适应滤波,从而辨识出未知载荷的特性参数。为校验算法,利用MATLAB/Simulink... 详细信息

为在线准确辨识载荷特性参数,提出一种利用关节力矩和触觉传感信息进行未知载荷特性参数辨识的方法。该方法基于牛顿-欧拉方程,采用归一化最小均方误差法进行自适应滤波,从而辨识出未知载荷的特性参数。为校验算法,利用MATLAB/Simulink和ADAMS软件搭建未知载荷特性辨识仿真平台。该平台执行机构包括多自由度机械臂和二指爪末端操作器,机械臂关节具有力矩传感,末端操作器指爪内侧具有触力传感器。仿真表明,在具有激励信号幅值1%的白噪声情况下,辨识误差小于2%。

关键词：空间机械臂特性辨识未知载荷触觉传感归一化最小均方误差法