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注极的光散射研究
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作者 郑洪 史金荣 +2 位作者 赵明洲 徐永晨 周佩珍 《同济大学学报(自然科学版)》 EI CAS CSCD 1991年第4期495-500,共6页
本文用布里渊光散射方法研究了注极对声子性能的影响,观察了注极前后折射率的变化,从而导出了PMMA材料在注极前后的声子速度。
关键词 注极 光散射 声子 传播 方向
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古代书画论今注今译中的讹误举隅——以潘运告编著《元代书画论》中《衍极并注》的注译为例
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作者 吴建权 《中国书画》 2021年第1期124-125,共2页
从汉至清,各种书论、画论可谓卷帙浩繁,而古文与今文的差异也给那些不熟悉古文者在阅读古代书画论时带来了障碍。幸赖当代一些学者为古代书画论作了今注今译,对我们阅读和研究古代书画论都大有裨益。其中,潘运告编著的《中国书画论丛书... 从汉至清,各种书论、画论可谓卷帙浩繁,而古文与今文的差异也给那些不熟悉古文者在阅读古代书画论时带来了障碍。幸赖当代一些学者为古代书画论作了今注今译,对我们阅读和研究古代书画论都大有裨益。其中,潘运告编著的《中国书画论丛书(十四册)》是今天较为全面的古代书画论译注著作。该丛书收录了古代书画论的大量名篇,并一一作了较为详尽的今注今译,在古代书画论译注著作中颇具代表性。 展开更多
关键词 中国书画 古代书画 书论 画论 元代书画 丛书
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PVDF/PMN-PZT复合驻极体薄膜及其特性 被引量:2
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作者 杨大本 许萍 《电子元件与材料》 CAS CSCD 1997年第5期17-19,共3页
采用流延法制备了PVDF/PMN-PZT两相3-0型柔性复合驻极体薄膜,研究了其形成与结构,探讨了电晕注极技术,以及复合驻极体的介电、压电与电荷存贮效应与机理。该柔性复合驻极体薄膜厚50~150μm,压电应变常数d3... 采用流延法制备了PVDF/PMN-PZT两相3-0型柔性复合驻极体薄膜,研究了其形成与结构,探讨了电晕注极技术,以及复合驻极体的介电、压电与电荷存贮效应与机理。该柔性复合驻极体薄膜厚50~150μm,压电应变常数d33为35~45pC/N,相对介电系数εr为60~80,寿命≥55年。 展开更多
关键词 复合驻 电晕注极 效应
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毫米级栅型电场分布FEP薄膜驻极体的制备及其电荷存储性能研究 被引量:2
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作者 张林成 陈钢进 +3 位作者 肖慧明 蔡本晓 黄华 吴玲 《物理学报》 SCIE EI CAS CSCD 北大核心 2015年第23期303-310,共8页
采用电晕注极和热注极技术,在厚度为25μm的氟化乙丙烯共聚物(FEP)表面制备了宽度为2 mm和3mm的具有栅型电场分布的驻极体,研究了注极温度和电极宽度对其电荷存储性能的影响.样品注极后经150天的存储,栅型电场分布变得清晰而有规律,覆... 采用电晕注极和热注极技术,在厚度为25μm的氟化乙丙烯共聚物(FEP)表面制备了宽度为2 mm和3mm的具有栅型电场分布的驻极体,研究了注极温度和电极宽度对其电荷存储性能的影响.样品注极后经150天的存储,栅型电场分布变得清晰而有规律,覆盖铝电极区电位已衰减至接近零,未覆盖铝电极区仍保持高电位;对电极宽度为2 mm和3 mm的样品,覆盖铝电极区与未覆盖铝电极区的表面电位差分别为110 V和130V(电场强度差分别为44 k V/cm和52 k V/cm).表面电位跟踪测试结果表明:电晕注极样品初始表面电位高于热注极样品;在相同的注极方法下,注极温度越高初始表面电位越高,电极宽度越小初始表面电位越低.依据电晕注极和热注极原理对实验结果的分析表明,FEP和金属铝在电荷存储性能上的差异是FEP表面蒸镀铝电极后能获得栅型电场分布的原因所在. 展开更多
关键词 栅型电场分布 注极技术 电荷存储性能
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氟化聚合物薄膜驻极体表面电位的双极性现象
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作者 樊占奎 陈钢进 +1 位作者 徐月寒 闫博文 《杭州电子科技大学学报(自然科学版)》 2023年第3期61-68,共8页
使用电晕和夹层注极方法对非极性氟化聚合物氟化乙丙烯共聚物(Fluorinated Ethylene Propylene Copolymer, FEP)和聚四氟乙烯(Poly Tetra Fluoroethylene, PTFE)薄膜、极性氟化聚合物四氟乙烯、六氟丙烯和偏氟乙烯共聚物(Tetrafluoroeth... 使用电晕和夹层注极方法对非极性氟化聚合物氟化乙丙烯共聚物(Fluorinated Ethylene Propylene Copolymer, FEP)和聚四氟乙烯(Poly Tetra Fluoroethylene, PTFE)薄膜、极性氟化聚合物四氟乙烯、六氟丙烯和偏氟乙烯共聚物(Tetrafluoroethylene, Hexafluoropropylene and Vinylidene Fluoride copolymer, THV)THV500及THV815薄膜进行注极,测量薄膜驻极体的表面电位稳定性和分布特征。实验结果表明,无论是极性聚合物还是非极性聚合物,注极后都呈现明显的双极性现象;在注极初始阶段,表面电位呈现快速衰减,稳定后,非极性聚合物的表面电位较高,极性聚合物的表面电位很低;与夹层注极后的薄膜驻极体相比,电晕注极后的薄膜驻极体的初始表面电位较高;用乙醇擦洗薄膜驻极体的一个面时,其两面的表面电位均发生衰减。 展开更多
关键词 性驻 表面电位 电荷分布 注极方法
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Analysis and Optimization of the Characteristics of a New IEC-GTO Thyristor 被引量:2
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作者 王彩琳 高勇 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2007年第4期484-489,共6页
Based on a short anode GTO structure (SA-GTO),a novel GTO structure called an injection efficiency controlled gate turn off thyristor (IEC-GTO) is proposed,in which the injection efficiency can be controlled via a... Based on a short anode GTO structure (SA-GTO),a novel GTO structure called an injection efficiency controlled gate turn off thyristor (IEC-GTO) is proposed,in which the injection efficiency can be controlled via an additional thin oxide layer located in the short anode contact region. The forward blocking, conducting, and switching characteristics are analyzed and compared with an SA-GTO and conventional GTO. The results show that the IEC-GTO can obtain a better trade-off relation between on-state and turn-off characteristics. Additionally,the width of the oxide layer covering the anode region and the doping concentration of the anode region are optimized, the process feasibility is analyzed, and a realization scheme is given. The results show that the introduction of an oxide layer would not increase the complexity of process of the IEC-GTO. 展开更多
关键词 power semiconductor devices gate turn-off thyristor injection efficiency
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Study of LDBPs Shaft Skin Friction for Piles in Cohesiove Soils
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作者 石名磊 邓学钧 刘松玉 《Journal of Southeast University(English Edition)》 EI CAS 2002年第2期154-158,共5页
The methodology of predicting pile shaft skin ultimate friction has been studied in a systematic way. In the light of that, the analysis of the pile shaft resistance for bored and cast in situ piles in cohesive soil... The methodology of predicting pile shaft skin ultimate friction has been studied in a systematic way. In the light of that, the analysis of the pile shaft resistance for bored and cast in situ piles in cohesive soils was carried out thoroughly in the basis of field performance data of 10 fully instrumented large diameter bored piles (LDBPs) used as the bridge foundation. The undrained strength index μ in term of cohesive soils was brought forward in allusion to the cohesive soils in the consistence plastic state, and can effectively combine the friction angle and the cohesion of cohesive soils in undrained condition. And that the classical ' α method' was modified much in effect to predict the pile shaft skin friction of LDBPs in cohesive soils. Furthermore, the approach of standard penetration test (SPT) N value used to estimate the pile shaft skin ultimate friction was analyzed, and the calculating formulae were established for LDBPs in clay and silt clay respectively. 展开更多
关键词 large diameter bored piles pile shaft skin friction blow count of standard penetration test
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新型注铯镁金属光阴极的实验研究 被引量:1
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作者 唐渝兴 赵坤 +6 位作者 郝建奎 王莉芳 全胜文 杨希 张云驰 张保澄 赵夔 《物理学报》 SCIE EI CAS CSCD 北大核心 2000年第5期1002-1005,共4页
报道了用于激光驱动高亮度注入器的新型光阴极的实验研究 .用铯离子注入的方法得到了在镁基底上的掺铯合金光阴极 ,研究了注入、溅射及光电发射的机制和参数 .用此阴极得到了比纯金属镁阴极高约一个量级的量子效率和绿光下的单光子发射... 报道了用于激光驱动高亮度注入器的新型光阴极的实验研究 .用铯离子注入的方法得到了在镁基底上的掺铯合金光阴极 ,研究了注入、溅射及光电发射的机制和参数 .用此阴极得到了比纯金属镁阴极高约一个量级的量子效率和绿光下的单光子发射效应 。 展开更多
关键词 新型铯镁金属光阴 实验 加速器 电子枪
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Channel Lateral Pocket or Halo Region of NMOSFET Characterized by Interface State R G Current of the Forward Gated Diode
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作者 何进 黄爱华 +1 位作者 张兴 黄如 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2001年第7期826-831,共6页
The channel lateral pocket or halo region of NMOSFET characterized by interface state R G current of a forward gated diode has been investigated numerically for the first time.The result of numerical analysis demons... The channel lateral pocket or halo region of NMOSFET characterized by interface state R G current of a forward gated diode has been investigated numerically for the first time.The result of numerical analysis demonstrates that the effective surface doping concentration and the interface state density of the pocket or halo region are interface states R G current peak position dependent and amplitude dependent,respectively.It can be expressed quantitatively according to the device physics knowledge,thus,the direct characterization of the interface state density and the effective surface doping concentration of the pocket or halo becomes very easy. 展开更多
关键词 forward gated diode R G current MOSFET pocket or halo implant region interface states effective surface doping concentration
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Preparation of Sb2O3/Sb2S3/FeOOH composite photoanodes for enhanced photoelectrochemical water oxidation 被引量:3
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作者 Yang PENG Jia CHEN +4 位作者 Liang-xing JIANG Tian-yi WANG Hai-chao YANG Fang-yang LIU Ming JIA 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第6期1625-1634,共10页
A novel Sb2O3/Sb2S3/FeOOH photoanode was fabricated via a simple solution impregnation method along with chemical bath deposition and post-sulfidation.The X-ray diffractometry,Raman measurement,and X-ray photoelectron... A novel Sb2O3/Sb2S3/FeOOH photoanode was fabricated via a simple solution impregnation method along with chemical bath deposition and post-sulfidation.The X-ray diffractometry,Raman measurement,and X-ray photoelectron spectroscopy show that the Sb2O3/Sb2S3/FeOOH thin films are successfully prepared.SEM−EDS analyses reveal that the surface of Sb2O3/Sb2S3 thin films becomes rough after the immersion in the FeCl3 solution.The optimized impregnation time is found to be 8 h.The FeOOH co-catalyst loaded Sb2O3/Sb2S3 electrode exhibits an enhanced photocurrent density of 0.45 mA/cm2 at 1.23 V versus RHE under simulated 1 sun,which is approximately 1.41 times compared to the photocurrent density of the unloaded one.Through the further tests of UV−Vis spectroscopy,the electrochemical impedance spectra,and the PEC measurements,the enhancement can result from the increased light-harvesting ability,the decreased interface transmission impedance,and the remarkably enhanced carrier injection efficiency. 展开更多
关键词 Sb2O3/Sb2S3 FeOOH co-catalyst PHOTOANODE carrier injection efficiency
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Optimization Design of Superluminescent Diodes with RWG Structure for High Efficiency Coupling with SMFs
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作者 钟馨 黄翊东 +2 位作者 赵涵 张巍 彭江得 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2006年第4期683-687,共5页
With the aim of achieving high coupling power of RWG SLDs into SMFs,the structure dependences of the output power and the near field pattern are investigated. The thicknesses of the layers between the active region an... With the aim of achieving high coupling power of RWG SLDs into SMFs,the structure dependences of the output power and the near field pattern are investigated. The thicknesses of the layers between the active region and the ridge waveguide are optimized by taking into account the injected carrier distribution and local material gain in the SLD cross section. 展开更多
关键词 superluminescent diode coupling efficiency injection efficiency
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Efficiency analysis of a-SiC:H thin film light emitting diodes 被引量:1
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作者 ZHOU Yaxun(Dept.of Physics,Ningbo University,Ningbo 315211,Zhejiang,CHN) 《Semiconductor Photonics and Technology》 CAS 1995年第1期24-30,共7页
The hole injection,the radiative recombination and the device luminescent efficiencies of amorphous silicon carbide thin film p-i-n junction light emitting diodes are quantitatively calculated,and the effect of the ca... The hole injection,the radiative recombination and the device luminescent efficiencies of amorphous silicon carbide thin film p-i-n junction light emitting diodes are quantitatively calculated,and the effect of the carrier(especially the hole) injection and recombination processes on the device luminescent characteristics are revealed.Without considering the device junction temperature,it is found that the device luminescent efficiency mainly depends on the hole injection efficiency at low field and the hole radiative recombination efficiency at high field respectively.The theoretical analyses are in well agreement with the experimental results. 展开更多
关键词 Amorphous Semiconductors Thin Film Devices Light Emitting Diodes Luminescent Efficiency Injection Efficiency Radiative Recombination Efficiency
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Lightweight and polarized self-attention mechanism for abnormal morphology classification algorithm during traditional Chinese medicine inspection
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作者 ZHANG Qi HU Kongfa +1 位作者 WANG Tianshu YANG Tao 《Digital Chinese Medicine》 CAS 2024年第3期256-263,共8页
Objective To propose a Light-Atten-Pose-based algorithm for classifying abnormal morphology in traditional Chinese medicine(TCM)inspection to solve the problem of relying on manual labor or expensive equipment with pe... Objective To propose a Light-Atten-Pose-based algorithm for classifying abnormal morphology in traditional Chinese medicine(TCM)inspection to solve the problem of relying on manual labor or expensive equipment with personal subjectivity or high cost.Methods First,this paper establishes a dataset of abnormal morphology for Chinese medicine diagnosis,with images from public resources and labeled with category labels by several Chinese medicine experts,including three categories:normal,shoulder abnormality,and leg abnormality.Second,the key points of human body are extracted by Light-Atten-Pose algo-rithm.Light-Atten-Pose algorithm uses lightweight EfficientNet network and polarized self-attention(PSA)mechanism on the basis of AlphaPose,which reduces the computation amount by using EfficientNet network,and the data is finely processed by using PSA mecha-nism in spatial and channel dimensions.Finally,according to the theory of TCM inspection,the abnormal morphology standard based on the joint angle difference is defined,and the classification of abnormal morphology of Chinese medical diagnosis is realized by calculat-ing the angle between key points.Accuracy,frames per second(FPS),model size,parameter set(Params),and giga floating-point operations per second(GFLOPs)are chosen as the eval-uation indexes for lightweighting.Results Validation of the Light-Atten-Pose algorithm on the dataset showed a classification accuracy of 96.23%,which is close to the original AlphaPose model.However,the FPS of the improved model reaches 41.6 fps from 16.5 fps,the model size is reduced from 155.11 MB to 33.67 MB,the Params decreases from 40.5 M to 8.6 M,and the GFLOPs reduces from 11.93 to 2.10.Conclusion The Light-Atten-Pose algorithm achieves lightweight while maintaining high ro-bustness,resulting in lower complexity and resource consumption and higher classification accuracy,and the experiments prove that the Light-Atten-Pose algorithm has a better overall performance and has practical application in the pose estimation task. 展开更多
关键词 Traditional Chinese medicine(TCM) inspection Abnormal morphology Pose estimation Lightweight Polarized self-attention(PSA)mechanism
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Effects of unit size on current density and illuminance of micro-LED-array 被引量:5
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作者 田超 郭树旭 +2 位作者 梁静秋 梁中翥 郜峰利 《Optoelectronics Letters》 EI 2017年第2期84-89,共6页
A 300 μm×300 μm light emitting diode(LED) chip is divided into nine 80 μm×80 μm units with 30 μm spacing between adjacent ones. After arraying, the total saturation light output power and the maximum in... A 300 μm×300 μm light emitting diode(LED) chip is divided into nine 80 μm×80 μm units with 30 μm spacing between adjacent ones. After arraying, the total saturation light output power and the maximum injection current are enhanced by 5.19 times and nearly 7 times, respectively. In addition, the test results demonstrate that the illuminance uniformity on the receiving surface reaches the optimum when the spacing between the arrays is equal to the maximum flat condition. The larger the number of arrays, the greater the area with uniform illuminance on the receiving surface. 展开更多
关键词 spacing saturation uniformity receiving reaches chips illumination sustain maintain covering
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Gold nanoparticles attached NH^(2+) ion implantation-modified indium tin oxide electrode:Characterization and electrochemical studies 被引量:1
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作者 LI ShuoQi LIU Lu HU JingBo 《Science China Chemistry》 SCIE EI CAS 2012年第9期1940-1945,共6页
An NH2+ ion implantation-modified indium tin oxide film was prepared and the implantation of amino groups on the indium tin oxide substrate was verified by X-ray photoelectron spectroscopy analysis.The gold nanopartic... An NH2+ ion implantation-modified indium tin oxide film was prepared and the implantation of amino groups on the indium tin oxide substrate was verified by X-ray photoelectron spectroscopy analysis.The gold nanoparticles attached surface could be obtained by self-assembly of different sized colloidal gold nanoparticles onto the NH2+ ion implantation-modified indium tin oxide surface.By scanning electron microscopy and electrochemical techniques,the as-prepared AuNPs attached NH2+ ion implantation-modified indium tin oxide electrode was characterized and compared with bare indium tin oxide electrode.Using a [Fe(CN)6]3 /[Fe(CN)6]4 redox probe,the increasingly facile heterogeneous electron transfer kinetics resulting from the attached gold nanoparticle arrays was observed.The gold nanoparticle arrays exhibited high catalytic activity toward the electro-oxidation of nitric oxide,which could provide electroanalytical application for nitric oxide sensing. 展开更多
关键词 ion implantation gold nanoparticles indium tin oxide amino groups ELECTRODE
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A novel crosslinkable electron injection/transporting material for solution processed polymer light-emitting diodes 被引量:4
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作者 LIU ShengJian ZHONG ChengMei +3 位作者 ZHANG Jie DUAN ChunHui WANG XiaoHui HUANG Fei 《Science China Chemistry》 SCIE EI CAS 2011年第11期1745-1749,共5页
A novel crosslinkable water/alcohol soluble conjugated polymer PFN-C containing oxetane groups and aminoalkyl groups in the side chains has been developed and used as highly efficient electron injection and transporti... A novel crosslinkable water/alcohol soluble conjugated polymer PFN-C containing oxetane groups and aminoalkyl groups in the side chains has been developed and used as highly efficient electron injection and transporting material for polymer light-emitting diodes (PLEDs). The unique solubility in polar solvents and crosslinkable ability of PFN-C render it a good can- didate for solution processed multilayer PLEDs. It was found that PFN-C can greatly enhance the electron injection from high work-function metal cathode, due to its pendant amino groups. As a result, PLEDs with PFN-C/Al cathode exhibited compara- ble device performance to the devices with Ba/Al cathode. The resulting green light-emitting device showed promising perfor- mance with a maximum luminance efficiency of 13.53 cd A-1. 展开更多
关键词 polymer light-emitting diode cross-linkable electron-transporting material water/alcohol soluble conjugated polymer
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从书法艺术管窥中国文化心态(上)
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作者 张建华 《碑林集刊》 1998年第1期162-170,共9页
偶读庞朴先生著文《文化的民族性与世界的多元化》,颇有感悟。该文结束段中强调指出:'中华文化曾经有过独领风骚万国来朝的光辉历史,也曾有过一败涂地百孔千疮的历程,带着这两种经验,站在21世纪门口,我们相信,它一定能够妥善处理好... 偶读庞朴先生著文《文化的民族性与世界的多元化》,颇有感悟。该文结束段中强调指出:'中华文化曾经有过独领风骚万国来朝的光辉历史,也曾有过一败涂地百孔千疮的历程,带着这两种经验,站在21世纪门口,我们相信,它一定能够妥善处理好未来大潮中,本民族所应承担的人类使命'~①。为此,能不令人感悟和思索一点什么吗?.笔者感悟的同时。 展开更多
关键词 文化心态 万国来朝 庞朴 艺术语言 钟繇 晋人 审美意识 成公绥 魏晋时代
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Spin polarized current injection and transportation in a double T-shaped organic spintronic device
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作者 REN JunFeng SONG RuiRong +1 位作者 YUAN XiaoBo HU GuiChao 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2015年第3期71-75,共5页
A double T-shaped device model is constructed to investigate the spin polarized current injection and transportation properties in organic semiconductors.Based on the spin diffusion theory and Ohm’s law and consideri... A double T-shaped device model is constructed to investigate the spin polarized current injection and transportation properties in organic semiconductors.Based on the spin diffusion theory and Ohm’s law and considering the different charge-spin relationship of the special carriers in organic semiconductors,the current spin polarization has been obtained.Effects of the branch current ratio and the polaron proportion on the spin polarized current injection efficiency are studied.From the calculation,it is found that the improvement of the spin polarized current injection efficiency can be obtained by adjusting the branch current ratio;moreover,high polaron proportion in organic semiconductors is beneficial for obtaining high current spin polarization. 展开更多
关键词 organic spintronics spin polarized current injection current spin polarization
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庾翼与他的“家鸡野鹜”论的历史价值性
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作者 赵燕武 《书法》 2015年第11期127-129,共3页
庾氏一族多善书之士,其宗族兄弟常见于前人的论书著作当中。唐张彦远《法书要录》收唐窦臮、窦蒙《述书赋并注》所录晋六十三人书家中,收有庾氏一族庾亮、庾怿、庾翼、庾凖四人,以"博哉四庾,茂矣六郗,三谢之盛,八王之奇"形容当时善书... 庾氏一族多善书之士,其宗族兄弟常见于前人的论书著作当中。唐张彦远《法书要录》收唐窦臮、窦蒙《述书赋并注》所录晋六十三人书家中,收有庾氏一族庾亮、庾怿、庾翼、庾凖四人,以"博哉四庾,茂矣六郗,三谢之盛,八王之奇"形容当时善书之世族。1郑杓及刘有定《衍极并注》中言:"魏晋相承,善学隶古,莫如钟、王。自庾、谢、萧、阮诸人神气浸殊,体式未散。" 展开更多
关键词 庾翼 庾氏 六郗 庾亮 族兄弟 论书 张彦远 窦蒙 隶古
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Activating ZnO nanorod photoanodes in visible light by Cu ion implantation 被引量:9
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作者 Meng Wang Feng Ren +3 位作者 Guangxu Cai Yichao Liu Shaohua Shen Liejin Guo 《Nano Research》 SCIE EI CAS CSCD 2014年第3期353-364,共12页
Utilization of visible light is of crucial importance for exploiting efficient semiconductor catalysts for solar water splitting. In this study, an advanced ion implantation method was utilized to dope Cu ions into Zn... Utilization of visible light is of crucial importance for exploiting efficient semiconductor catalysts for solar water splitting. In this study, an advanced ion implantation method was utilized to dope Cu ions into ZnO nanorod arrays for photoelectrochemical water splitting in visible light. X-ray diffraction (XRD) and X-ray photo-electron spectroscopy (XPS) results revealed that Cu^+ together with a small amount of Cu^2+ were highly dispersed within the ZnO nanorod arrays. The Cu ion doped ZnO nanorod arrays displayed extended optical absorption and enhanced photoelectrochemical performance under visible light illumination (A 〉 420 nm). A considerable photocurrent density of 18 μA/cm^2 at 0.8 V (vs. a saturated calomel electrode) was achieved, which was about 11 times higher than that of undoped ZnO nanorod arrays. This study proposes that ion implantation could be an effective approach for developing novel visible-light-driven photocatalytic materials for water splitting. 展开更多
关键词 ion implantation Cu ion doping ZnO nanorods PHOTOANODE water splitting
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