作者：
Wu, X. Z.;Long, M. Q.*;Chen, L. N.;Cao, C.;Ma, S. S.;...
期刊：
Physica E-Low-Dimensional Systems & Nanostructures,2012年45:82-85 ISSN：1386-9477
通讯作者：
Long, M. Q.
作者机构：
[Cao, C.; Wu, X. Z.] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China.;[Long, M. Q.; Xu, H.] Cent S Univ, Coll Sci & Technol, Sch Phys & Electon, Changsha 410083, Hunan, Peoples R China.;[Chen, L. N.] Univ S China, Sch Comp Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Long, M. Q.] C;Cent S Univ, Coll Sci & Technol, Sch Phys & Electon, Changsha 410083, Hunan, Peoples R China.
摘要：
Applying nonequilibrium Green’s functions in combination with the density functional theory, we investigated the effect of amino and hydroxyl groups on the transport property of the carbon atomic chains. The results show the conductance oscillation with the length and the parity of the carbon atomic chains, and the electronic transport properties can be modulated by the sites of amino and hydroxyl groups. And also, the negative differential resistance behaviors can be observed clearly. These phenomena may originate from the interaction of side groups with the carbon atomic chains and the change in coupling degree between the molecular orbitals and electrode states.
作者：
Chen, L. N.;Wu, X. Z.;Huang, W. R.;Ma, S. S.;Xu, H.*
期刊：
Solid State Communications,2012年152(10):868-872 ISSN：0038-1098
通讯作者：
Xu, H.
作者机构：
[Ma, S. S.; Xu, H.; Wu, X. Z.; Huang, W. R.; Chen, L. N.] Cent S Univ, Sch Phys Sci & Technol, Changsha 410083, Peoples R China.;[Chen, L. N.] Univ S China, Sch Comp Sci & Technol, Hengyang 421001, Peoples R China.;[Huang, W. R.] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Xu, H.] C;Cent S Univ, Sch Phys Sci & Technol, Changsha 410083, Peoples R China.
关键词：
A. Metallic carbon nanotube;D. Electronic property;D. Impurity and defect;E. First-principles
摘要：
Using first-principles calculations based on spin-polarized density functional theory, we investigate the electronic properties of metallic carbon nanotubes (MCNTs) with partial hydrogenation or vacancy defects. The calculated results show that the energy band structures of MCNTs strongly depend on the adsorption site or the vacancy-defect site. Interestingly, our results show the nonmagnetic semiconducting behavior of MCNTs in the case of balanced H adsorption or vacancy defects. However, the MCNTs exhibit magnetic metallic behavior in the case of imbalanced H adsorption or vacancy defects, and the energy band structure of MCNTs shows the appearance of a spin-polarized flat band near the Fermi level. This effect presents a possibility for spintronic device and semiconducting molecular wire applications.
作者机构：
[Jia Shu-ting; Xu Hui; Chen Ling-na] Cent S Univ, Sch Phys Sci & Technol, Changsha 410083, Hunan, Peoples R China.;[Chen Ling-na] Univ S China, Sch Comp Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Xu Hui] C;Cent S Univ, Sch Phys Sci & Technol, Changsha 410083, Hunan, Peoples R China.
关键词：
electronic transport properties;negative differential resistance;first-principle;molecular device
摘要：
By using the first-principle calculations and nonequilibrium Green functions method, the electronic transport properties of molecular devices constructed by C82, C80BN and C80N2 were studied. The results show that the electronic transport properties of molecular devices are affected by doped atoms. Negative differential resistance (NDR) behavior can be observed in certain bias regions for C82 and C80BN molecular devices but cannot be observed for C80N2 molecular device. A mechanism for the negative differential resistance behavior was suggested.
期刊：
Lecture Notes in Electrical Engineering,2012年124 LNEE(VOL. 1):383-388 ISSN：1876-1100
作者机构：
[Li, Xiao-Yun; Yu, Ying; Ma, Jia-Yu; Yang, Xiao-Hua; Wan, Ya-Ping; Liu, Zhi-Ming; Jiang, Hui] School of Computer Science and Technology, University of South China, Hengyang, Hunan, China
作者机构：
[Cao Can; Jia Shu-Ting; Xu Hui; Zhang Dan; Chen Ling-Na] Cent S Univ, Sch Phys Sci & Technol, Changsha 410083, Peoples R China.;[Chen Ling-Na] Univ S China, Sch Comp Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Xu Hui] C;Cent S Univ, Sch Phys Sci & Technol, Changsha 410083, Peoples R China.
关键词：
density functional theory;first-principles;MgF_2 codoped with cobalt and phosphorus;electronic structure optical properties
摘要：
By using the first-principles calculation based on density functional theory, we investigate the electronic structures and optical properties of Cl-doped Ag crystal. The results show that the electronic structure of Cl-doped Ag crystal depends on the doped concentration and the site of impurity defect. Interestingly, the calculated adsorption spectra of Cl-doped Ag crystal show isotropy or anisotropy coincide with the symmetry of Ag crystal. These features are discussed to provide guidance to experimental efforts for Ag-based nanoeletronic devices.
期刊：
Journal of Networks,2011年6(12):1719-1725 ISSN：1796-2056
通讯作者：
Tan, M.(tanminsheng65@163.com)
作者机构：
[Cui, Qiang; Zhao, Hui; Tan, Minsheng; Zhu, Lingfeng] School of Computer Science and Technology, University of South China, Hengyang Hunan, 421001, China
摘要：
A kind of wireless monitoring interface device based on wireless sensor networks for ammeters was proposed. Ammeters connected by UART or pulse interface to get ammeters’ real-time data. Then, an ammeter monitoring system based on wireless sensor networks (AMSBW) was designed. The system consist building-WSN and community wireless monitoring center. And user’s ammeters, ammeter wireless monitoring interface devices and building-sink nodes were included in the building-WSN; the center sink node and monitoring host were contained in community monitoring center. The functions of real-time monitoring, remote control and preventing electricity-stolen were designed in the AMSBW which had simple installation and configuration. Then a software system to test the AMSBW was exploited. At last, system’s tests results show that it could effectively achieve the goal of real-time monitoring and control ammeter.
期刊：
Information Technology Journal,2011年10(12):2322-2328 ISSN：1812-5638
通讯作者：
Tan, M.
作者机构：
[Zeng, Lin; Xia, Shiying; Tan, Minsheng; Xu, Hui] School of Computer Science and Technology, University of South China, Hunan Hengyang, 421001, China
通讯机构：
[Tan, M.] S;School of Computer Science and Technology, University of South China, China
通讯机构：
[Tan, Minsheng] U;Univ S China, Sch Comp Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
会议名称：
3rd International Conference on Measuring Technology and Mechatronics Automation (ICMTMA 2011)
会议时间：
JAN 06-07, 2011
会议地点：
Shanghai, PEOPLES R CHINA
会议主办单位：
[Tan, Minsheng;Tian, Haitao;Chen, Meng;Li, Xiang] Univ S China, Sch Comp Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
会议论文集名称：
Applied Mechanics and Materials
关键词：
B-MAC;B-MAC++;Preamble Mechanism;TDMA/CSMA
摘要：
B-MAC was a kind of MAC protocol which was widely used in Wireless Sensor Networks (WSNs), and some high requirements had been provided for users. However, there were always challenges due to the high energy consumption and packets loss rate. A new MAC protocol called B-MAC++ based on B-MAC was proposed in this paper. The preamble mechanism was improved and funneling effect alleviation mechanism was brought out in B-MAC++. For the combination of the strengths of TDMA and CSMA, the preamble mechanism improvement achieved better energy-efficient, and made up to the weakness of WSNs, and a kind of CSMA/TDMA mechanism was introduced to alleviate funneling effect, and the sink-node's packet loss had been reduced. Experiments show that B-MAC++ is better than B-MAC in the performance of energy consumption and packet loss rate.
期刊：
International Review on Computers and Software,2011年6(6):1117-1121 ISSN：1828-6003
通讯作者：
Liu, S.
作者机构：
[Liu, Shukun; Chen, Jifeng] Department of Computer Science and Technology, Hunan International Economics University, Changsha 410205, China;[Yang, Xiaohua] Department of Computer Science and Technology, University of South China, Hengyang 421001, China
通讯机构：
Department of Computer Science and Technology, Hunan International Economics University, China
期刊：
Proceedings of SPIE - The International Society for Optical Engineering,2009年7496 ISSN：0277-786X
通讯作者：
Liu, L.(ll710915@yahoo.com.cn)
作者机构：
[Liu, Li] School of Computer Science and Technology, University of South China, HengYang 421001;[Peng, Fuyuan; Yang, Luo; Liu, Li] Department of Telecommunication, HuaZhong Science and Technology University, WuHan 430076
通讯机构：
School of Computer Science and Technology, University of South China, China
会议名称：
MIPPR 2009: Pattern Recognition and Computer Vision
会议时间：
Yichang, China
会议论文集名称：
MIPPR 2009: Pattern Recognition and Computer Vision
摘要：
The image information change law with the change of scale parameter is first studied in terms of regarding ramp edge and step edge as measurement of image information. Then the paper proposes a kind of adaptive recursive algorithm of scale parameter with the module of visual characters. The information of the image is uniformly distributed among each layer in the algorithm. The method can avoid the problem of complicated computation or over- distortion because of losing too much key information. The experimental results show that the uniformly distributed information is more reasonable for human to perceive an image which will be useful for higher-level image processing technologies such as object recognition.
期刊：
Journal of Computational Information Systems,2009年5(1):17-27 ISSN：1553-9105
通讯作者：
Wan, Y.(wypzll@163.com)
作者机构：
[Yang, Tianming; Wang, Fang; Wan, Yaping; Feng, Dan] School of Computer Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China;[Wan, Yaping; Liu, Li] School of Computer Science and Technology, Nanhua University, Hengyang 421001, China
通讯机构：
School of Computer Science and Technology, Huazhong University of Science and Technology, China
摘要：
Stable local feature detection is a fundamental component of many stereo vision problems such as 3-D reconstruction, object localization, and object tracking. A robust method for extracting scale-invariant feature points is presented. First, the Harris corners in three-level pyramid are extracted. Then, the points detected at the highest level of the pyramid are correctly propagated to the lower level by pyramid based scale invariant (PBSI) method. The corners detected repeatedly in different levels are chosen as final feature points. Finally, the characteristic scale is obtained based on maximum entropy method. The experimental results show that the algorithm has low computation cost, strong antinoise capability, and excellent performance in the presence of significant scale changes.
