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Electronic transmission of three-terminal pyrene molecular bridge

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Chinese Physics B 2009年第2期18卷 501-505页

作者：王利光张秀梅 Terence Kin Shun Wong Katsunori Tagami masaru tsukada School of Science Jiangnan University School of Electrical and Electronic Engineering Nanyang Technological University Nano Technology Research Centre Waseda University

This paper investigates theoretically the electronic transmission spectra of the three terminal pyrene molecular bridge and the quantum current distribution on each bond by the tight-binding model based on nonequilibrium Green＇s function and the quantum current density approach, in which one π molecular orbital is taken into account per carbon atom when the energy levels and HOMO-LUMO gap are obtained. The transmission spectra show that the electronic transmission of the three terminal pyrene molecular bridge depends obviously on the incident electronic energy and the pyrene eigenenergy. The symmetrical and oscillation properties of the transmission spectra are illustrated. A novel plus-minus energy switching function is found. The quantum current distribution shows that the loop currents inside the pyrene are induced, and some bond currents are much larger than the input and the output currents. The reasons why the loop currents and the larger bond currents are induced are the phase difference of the atomic orbits and the degeneracy of the molecular orbits. The calculations illustrate that the quantum current distributions are in good agreement with Kirchhoff quantum current conservation law.

关键词： pyrene three terminals electronic transmission current distribution

C_(60)分子的电子传导和量子流分布研究

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人工晶体学报 2005年第4期34卷 637-641页

作者：王利光郁鼎文李勇塚田捷江南大学理学院无锡214122 清华大学精密仪器与机械学系北京100084 东京大学大学院物理系

利用基于Green’sfunction的tight-binding方法,对由两条原子线电极连接C60分子远端构成的电子传导系统进行了理论计算和数值模拟,得出了入射电子通过C60分子传输到远端点的电子传输谱。其结果揭示了电子传导过程中C60分子的开关特性,... 详细信息

利用基于Green’sfunction的tight-binding方法,对由两条原子线电极连接C60分子远端构成的电子传导系统进行了理论计算和数值模拟,得出了入射电子通过C60分子传输到远端点的电子传输谱。其结果揭示了电子传导过程中C60分子的开关特性,并且得出了电子传输能量与分子轨道共振时传输概率峰值的出现及振荡特征。利用Fisher-Lee关系式和量子流密度理论,在传输概率峰值的能量点E=-1.38eV处获得了C60分子内的量子流分布,给出了键量子流的最大值和最小值。对全部分子键上的量子流数值进行了图形模拟,其结果符合量子流动量守恒定律。

关键词： C60分子电子传导开关特性量子流分布

电极耦接变化对分子器件电子输运特性影响的研究

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人工晶体学报 2008年第1期37卷 20-24页

作者：王利光陈蕾李勇郭良田上胜规塚田捷江南大学理学院无锡214122 清华大学摩擦学国家重点实验室微纳制造分室北京100084 早稻田大学纳米技术研究中心120-5 日本东京162-00041

利用基于Green函数的Tight-binding理论,对phenalenyl构成的单分子器件电极耦接点变化情况下的电子输运特性进行了研究。通过理论计算,得出了分子与原子线电极间接点变化对电子输运的影响。结果显示电子通过phenalenyl分子器件的概率随... 详细信息

利用基于Green函数的Tight-binding理论,对phenalenyl构成的单分子器件电极耦接点变化情况下的电子输运特性进行了研究。通过理论计算,得出了分子与原子线电极间接点变化对电子输运的影响。结果显示电子通过phenalenyl分子器件的概率随着分子与电极的耦合点的变化而改变。当耦接点改变时,不仅电子通过phenalenyl分子的概率变化,而且无源正负能量开关器件的特征也发生变化。所得结果还揭示出在应用phenalenyl分子器件时,只需改变电极耦接,就可以获得具有不同电子学特性的分子器件。

关键词： phenalenyl分子器件电极耦接点电子输运

Pyrene分子(小片石墨晶体)的电子传导特性(英文)

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人工晶体学报 2007年第5期36卷 1026-1030,1021页

作者：王利光张鸿宇陈蕾李勇郁鼎文田上胜规塚田捷江南大学理学院清华大学国家摩擦重点实验室微纳分室北京100084 早稻田大学纳米技术研究中心120-5

利用量子理论中基于Green函数的tight-binding方法,对pyrene分子的电子传导和电子流分布进行了理论研究。在考虑到界面耦合和Hopping积分的情况下,得出了电子透射谱和流分布的模拟结果。结果显示透射与电子的能量紧密相关;谱的振荡特征... 详细信息

利用量子理论中基于Green函数的tight-binding方法,对pyrene分子的电子传导和电子流分布进行了理论研究。在考虑到界面耦合和Hopping积分的情况下,得出了电子透射谱和流分布的模拟结果。结果显示透射与电子的能量紧密相关;谱的振荡特征是能级量子化的结果;流分布有着特定的方向,并且在每一个原子点上符合Kirchhoff量子流守恒定律。另外还发现了桥接pyrene分子的正负能开关特性。

关键词：石墨晶片 Pyrene分子电导电流分布

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二端纳米分子桥的量子传输特性研究

黑龙江大学自然科学学报 2005年第1期22卷 8-11页

作者：王利光李勇塚田捷田上胜规江南大学理学院江苏无锡214122 清华大学精密仪器与机械学系北京100084 东京大学物理系

利用基于GreenFunction的Tight-binding方法,对由两个苯环分子耦合成的二端子纳米分子桥的量子传导特性进行了理论研究,在考虑到每一个碳原子中只有一个π轨道电子参与传导,注意到分子桥体和原子电极之间的Hoping积分比较弱的情况下 (... 详细信息

利用基于GreenFunction的Tight-binding方法,对由两个苯环分子耦合成的二端子纳米分子桥的量子传导特性进行了理论研究,在考虑到每一个碳原子中只有一个π轨道电子参与传导,注意到分子桥体和原子电极之间的Hoping积分比较弱的情况下 (约为普通值的 0 6),得出入射电子通过二端纳米分子桥的电子传输谱。结果显示透射电子传输峰值的出现是传导电子与分子轨道能级谐振的结果,而电子传输的振荡特性是透射电子粒子性与波动性同时存在时的物理反映。

关键词：纳米分子桥紧密键联结量子传导电子传输谱

Accurate design of a novel high-performance 11-pole triple-mode dielectric resonator BPF with fully controllable multiple transmission zeros for mobile communication base stations

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Science China(Information Sciences) 2025年第2期68卷 387-388页

作者： Fan LIU Zhewang MA Masataka OHIRA Dongchun QIAO Guosheng PU masaru ICHIKAWA Hunan Provincial Key Laboratory of Flexible Electronic Materials Genome Engineering School of Physics and Electronic SciencesChangsha University of Science and Technology Graduate School of Science and Engineering Saitama University Faculty of Science and Engineering Department of Electronics Doshisha University Huawei Technologies Japan K.K.

High performance dielectric resonator(DR) bandpass filters(BPFs) are critical components in modern RF/microwave front-end systems due to their many distinctive advantages like low loss, small size, light weight, and temperature-stable properties. In recent years, the rapid development of various wireless communication techniques is demanding much more critical specifications for microwave BPFs with better performance but further reduced loss, size, and *** a prospective approach to meet these stringent requirements, BPFs using triple-mode DRs are attracting much attention from both academia and industry [1–5].

关键词：

Hypothesis Testing for Independence Under Blocked Compound Symmetric Covariance Structure

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Communications in Mathematics and Statistics 2018年第2期6卷 163-184页

作者： Shin-ichi tsukada School of Education Meisei University2-1-1 Hodokubo HinoTokyo 191-8506Japan

One type of covariance structure is known as blocked compound ***,Roy et al.(J Multivar Anal 144:81–90,2016)showed that,assuming this covariance structure,unbiased estimators are optimal under normality and described hypothesis testing for independence as an open *** this paper,we derive the distributions of unbiased estimators and consider hypothesis testing for *** test statistics such as the likelihood ratio criterion,Waldstatistic,Rao’s score statistic,and gradient statistic are derived,and we evaluate the accuracy of the test using these statistics through numerical *** power of the Wald test is the largest when the dimension is high,and the power of the likelihood ratio test is the largest when the dimension is low.

关键词： Hypothesis testing Asymptotic distribution Independence Blocked compound symmetric covariance structure

Control of Collection Efficiency for Axial Flow Cyclone Dust Collectors with Fixed Guide Vanes and with Funnel Shaped Exit Pipes

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Journal of Thermal Science 2006年第3期15卷 240-250页

作者： Akira Ogawa masaru Arakawa T-110-0011 Minowa 2-14-7Taitou-KuTokyoJapan SHINWA RULES Co. Ltd.Sanjo-ShiNiigataJapan

The experimental result of the collection efficiency of the axial flow cyclone with the fixed guide vanes is lower than that with the tangential inlet pipe to the cyclone body due to the weak angular momentum transfer given by flowing through the guide vanes. However, one of the interesting points is the control of the collection efficiency depended on the funnel shaped exit pipes. The collection efficiencies for these funnel shaped exit pipes are depended on the Froude number. Then, in this paper, the experimental results of the pressure drop and also the collection efficiency using the fly-ash particles and also the comparison of the calculated results of the collection efficiency with the experimental results are described i~ detail.

关键词： Axial flow cyclone funnel shaped exit pipe fixed guide vanes pressure drop collection efficiency,Froude number cut-Size

Effect of bending and tension deformation on the texture evolution and stretch formability of Mg-Zn-RE-Zr alloy

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International Journal of Minerals,Metallurgy and Materials 2022年第7期29卷 1334-1342页

作者： Yuya Ishiguro Xinsheng Huang Yuhki tsukada Toshiyuki Koyama Yasumasa Chino Department of Materials Design Innovation Engineering Nagoya UniversityFuro-choChikusa-kuNagoya464-8603Japan Multi-Material Research Institute National Institute of Advanced Industrial Science and Technology2266-98AnagahoraSimo-shidami Moriyama-kuNagoya463-8560Japan

Bending and tension deformations were performed on Mg-1.3 wt%Zn-0.2 wt%RE-0.3 wt%Zr(ZEK100)alloy sheets that initially had a transverse direction(TD)-split *** effects of bending and tension deformations on the texture formation and room-temperature formability of specimens were *** specimen subjected to 3-pass bending and tension deformations exhibited an excellent Erichsen value of 9.6 ***,the Erichsen value deterioration was observed in the specimen subjected to 7-pass *** rolling direction-split texture developed on the surface with an increasing pass number of ***,the clear TD-split texture remained at the central *** a result,a quadrupole texture was macroscopically developed with an increasing pass number of *** reduction in anisotropy by the formation of the quadrupole texture is suggested to be the main reason for the improvement in stretch *** contrast,the generation of coarse grains near the surface is suggested to be the direct cause for the deterioration of the stretch formability of the specimen subjected to 7-pass deformations.

关键词： magnesium alloy texture stretch formability bending and tension deformation mechanical properties