摘要：
The microstructure evolution of NiA-2.5Ta-7.5Cr alloy during annealing at different temperatures was investigated.It is found that the microstructure of the as-cast alloy consists of coarse Laves phase Ta(CrNiAI)2 with C14 structure at grain boundaries and Cr-rich particles with sizes in the range of 400-500 nm in the NiAI matrix.The Ta and Cr concentrations in the NiAl are-0.6% and-2.5% (at%),respectively.When the alloy is annealed at the temperature above 1000 ℃,fine rod-like Laves phases with C15 structure begin to precipitate dispersively in the NiAl.After annealing at 1200 ℃ for 2 h,the volume fraction of the particles increases,and in the mean time,the Ta concentration in NiAl matrix reduces to ~0.2at%.As the annealing temperature further increases to 1400 ℃,the Laves phase precipitates dissolve in the NiAl matrix completely.Therefore,the precipitation of Laves phase in NiAI during the annealing in the temperature range of 1000-1300 ℃ may be attributed to the diffusing followed by the supersaturation of Ta in NiAl after the solidification.
作者机构：
[Xing, Song] Calif State Univ Los Angeles, Dept Informat Syst, Los Angeles, CA 90032 USA.;[Yan, Feng; Shen, Lianfeng; Ding, Zhaoming] Southeast Univ, Natl Mobile Commun Res Lab, Nanjing 210096, Jiangsu, Peoples R China.;[Deng, Shuguang] Hunan City Univ, Coll Commun & Elect Engn, Yiyang 413000, Peoples R China.
会议名称：
9th International Conference on Wireless Communications and Signal Processing (WCSP)
会议时间：
OCT 11-13, 2017
会议地点：
Nanjing, PEOPLES R CHINA
会议主办单位：
[Ding, Zhaoming;Yan, Feng;Shen, Lianfeng] Southeast Univ, Natl Mobile Commun Res Lab, Nanjing 210096, Jiangsu, Peoples R China.^[Xing, Song] Calif State Univ Los Angeles, Dept Informat Syst, Los Angeles, CA 90032 USA.^[Deng, Shuguang] Hunan City Univ, Coll Commun & Elect Engn, Yiyang 413000, Peoples R China.
会议论文集名称：
International Conference on Wireless Communications and Signal Processing
关键词：
Carrier sensing threshold;link success probability;Poisson point process;dense wireless networks
摘要：
Considering a small-scale fading environment in a dense random wireless network, we investigate the impact of the carrier-sensing threshold on the link performance under the premise of a fixed carrier-sensing range. At first, we assume a close transmitter-receiver distance and model the network nodes as a homogeneous Poisson point process (PPP). Then we present a simple analysis model of the conditional link success probability to establish a correlation between the interference capture and the link success. Subsequently, based on the assumption that the interference among proximity nodes mainly comes from the nearby nodes, we obtain the bounds of the carrier-sensing threshold through stochastic analysis and a simple adaptive algorithm to adjust the carrier-sensing threshold within its bounds is further presented. Numerical results show that the proposed method enables the pending transmitter to adjust the bounds of the carrier-sensing threshold adaptively when the channel path-loss exponent changes and the validity of the proposed adaptive algorithm is verified in the simulations.
作者机构：
[Pan Liuxian] Department of Physics, Hunan City University;[Yan Jiaren; Zhou Guanghui] Physics Department and Institute of Nonlinear Physics, Hunan Normal University;Hunan City Univ, Dept Phys, Yiyang 413049, Peoples R China.;Hunan Normal Univ, Dept Phys, Changsha 410081, Peoples R China.;Hunan Normal Univ, Inst Nonlinear Phys, Changsha 410081, Peoples R China.
关键词：
KdV-MKdV equation;soliton;perturbation
摘要：
The authors develop a direct approach to the soliton perturbation based on the separation of variables. With the aid of approach, the first-order effects of perturbation on a KdV-MKdV soliton are derived, both the slow time-dependence of the soliton parameters and the first-order correction are obtained.
期刊：
MODERN PHYSICS LETTERS B,2019年33(6) ISSN：0217-9849
通讯作者：
He, Longhui
作者机构：
[Liu, Sheng] Hunan Inst Engn, Sch Mech Engn, Xiangtan 411104, Peoples R China.;[He, Jun; Shan, Dongyong; He, Longhui; Xu, Hui] Cent S Univ, Sch Phys & Elect, Changsha 410083, Hunan, Peoples R China.;[Ghen, Zhiquan; He, Longhui] Hunan City Univ, Sch Commun & Elect Engn, Yiyang 413000, Peoples R China.
通讯机构：
[He, Longhui] Cent S Univ, Sch Phys & Elect, Changsha 410083, Hunan, Peoples R China.;Hunan City Univ, Sch Commun & Elect Engn, Yiyang 413000, Peoples R China.
关键词：
Metamaterial perfect absorber;square ring structure;low frequency;magnetic metal
摘要：
A metal-dielectric-metal (MDM) sandwich metamaterial perfect absorber (MPA) with magnetic nickel metal has been designed. An optimal absorption of 99.28% at 404 MHz is achieved for MPA with thickness of 5.54 mm. Resonant absorption is demonstrated to be main mechanism according to analyses on surface current distributions and electromagnetic field distributions. Furthermore, the electromagnetic energy is mainly dissipated in magnetic metal with magnetic loss proportion of 55.43% by comparatively analyzing the wave-absorbing performance of using magnetic metal, non-magnetic metal and perfect electric conductor (PEC) as metallic layers. These results would provide a guidance for the design of quasi-microwave absorbing/shielding materials.
作者机构：
[Hu, Juan] Hunan Inst Sci & Technol, Inst Comp, Yueyang, Hunan, Peoples R China.;[Yan, Quanfeng] Inst Comp Hunan Inst Sci & Technol, Hunan, Peoples R China.;[Tu, Li] Hunan City Univ, Dept Comp Sci, Yiyang, Hunan, Peoples R China.
会议名称：
2011 International Conference on Green Building, Materials and Civil Engineering, GBMCE 2011
会议时间：
August 22, 2011 - August 23, 2011
会议地点：
Shangri-La, China
会议主办单位：
(1) Institute of Computer Hunan Institute of Science and Technology, Yueyang, Hunan, China; (2) Department of Computer Science, Hunan City University, Yiyang, Hunan, China
摘要：
Considering the current image de-noising methods may lose some structural features, this paper proposes an improved sparse representation based method by adopting the histogram structural similarity. When the initial over-complete dictionary was applied in the sparse decomposition, similarity factor could replace the reconstruction error as the factor of fidelity. The orthogonal matching pursuit algorithm(OMP) is used to reconstruct the denoised image. The experimental results show that the proposed method could provide better PSNR and HSSIM results compared with the wavelet transformation, the K-SVD algorithm and the method presented in [10], meanwhile, and the structural features can be reserved effectively by the proposed method.
作者：
Hai, WH*;Duan, YW;Pan, LX;Mang, F;Zhu, XW;Shi, L
期刊：
Communications in Theoretical Physics,2000年33(4):537-542 ISSN：0253-6102
通讯作者：
Hai, WH
作者机构：
[Hai, WH] Hunan Normal Univ, Dept Phys, Changsha 410081, Peoples R China.;Chinese Acad Sci, Wuhan Inst Phys & Math, Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Peoples R China.;Yiyang Teachers Coll, Dept Phys, Yiyang 413049, Hunan Province, Peoples R China.
通讯机构：
[Hai, WH] Hunan Normal Univ, Dept Phys, Changsha 410081, Peoples R China.
关键词：
Josephson effect;control;chaos;stability
摘要：
The models of rf-driven Josephson junctions are investigated as the perturbed systems. It is shown that the heteroclinic orbits corrected by perturbations are stable if some relations between the initial constants and system parameters are satisfied, which leads to Melnikov chaos: To stabilize chaos one has to make the control parameters fitting the relations. The result is compared with the previous numerical work and a good agreement is found.
摘要：
Biometrics plays an important role in authentication applications since they are strongly linked to holders. With an increasing growth of e-commerce and e-government, one can expect that biometric-based authentication systems are possibly deployed over the open networks in the near future. However, due to its openness, the Internet poses a great challenge to the security and privacy of biometric authentication. Biometric data cannot be revoked, so it is of paramount importance that biometric data should be handled in a secure way. In this paper we present a scheme achieving privacy-preserving fingerprint authentication between two parties, in which fingerprint minutiae matching algorithm is completed in the encrypted domain. To improve the efficiency, we exploit homomorphic encryption as well as garbled circuits to design the protocol. Our goal is to provide protection for the security of template in storage and data privacy of two parties in transaction. The experimental results show that the proposed authentication protocol runs efficiently. Therefore, the protocol can run over open networks and help to alleviate the concerns on security and privacy of biometric applications over the open networks.
摘要：
Based on a modified cross-correlation technique, we experimentally demonstrate a technique for measuring the spatial–temporal intensity of laser pulses. Pulse widths at different spatial positions of the ultrashort pulse are measured by changing the scan position of the probe beam. Due to the existence of residual chirp in the transverse position, pulse widths at the center of the beam are less than that at the edge. By measuring the temporal evolution in the fastest growth area of spatial intensity during small-scale self-focusing, we find that its pulse width decreases as power increases because of the spatial–temporal coupling effect. The results show that this method not only can be used to accurately measure the pulse width at any one spatial position of the beam, but can also be useful for real-time monitoring of the spatial–temporal evolution.
作者：
Tang, Min*;Yan, Feng;Deng, Shuguang;Shen, Lianfeng;Kuang, Sufeng;Xing, Song
作者机构：
[Xing, Song] Calif State Univ Los Angeles, Dept Informat Syst, Los Angeles, CA 90032 USA.;[Yan, Feng; Shen, Lianfeng; Tang, Min; Kuang, Sufeng] Southeast Univ, Natl Mobile Commun Res Lab, Nanjing 210096, Jiangsu, Peoples R China.;[Deng, Shuguang] Hunan City Univ, Coll Commun & Elect Engn, Yiyang 413000, Peoples R China.
会议名称：
8th International Conference on Wireless Communications & Signal Processing (WCSP)
会议时间：
OCT 13-15, 2016
会议地点：
Yangzhou, PEOPLES R CHINA
会议主办单位：
[Tang, Min;Yan, Feng;Shen, Lianfeng;Kuang, Sufeng] Southeast Univ, Natl Mobile Commun Res Lab, Nanjing 210096, Jiangsu, Peoples R China.^[Deng, Shuguang] Hunan City Univ, Coll Commun & Elect Engn, Yiyang 413000, Peoples R China.^[Xing, Song] Calif State Univ Los Angeles, Dept Informat Syst, Los Angeles, CA 90032 USA.
会议论文集名称：
International Conference on Wireless Communications and Signal Processing
摘要：
In this paper, two coverage optimization algorithms based on Voronoi diagram are proposed to reduce the energy consumption of software-defined sensor networks (SDSNs). In the first algorithm named Minimax Radius Algorithm (MRA), we try to reduce the sensing radii of nodes as much as possible while preserving the original network coverage. In the second algorithm named Sleeping-based Algorithm (SLA), we try to set as many nodes as possible into sleep mode without generating new coverage holes. Simulation results show that both algorithms can reduce the energy consumption significantly and the energy reduction rate increases with no des' sensing radius and the number of nodes.
关键词：
visual tracking;sparse representation;weight patch;temporal information
摘要：
Developing an effective and efficient appearance model for robust visual tracking is difficult because of various interfering factors, such as postural change, occlusion, and rapid motion. More and more visual tracking methods tend to exploit local sparse appearance model to deal with the above problems. Since in the local sparse appearance model, all individual patch together to form a complete target which mean each patch can describe some extent of the target appearance information. In this work, we propose a simple yet effective tracking method to exploit the important patches through weights operating which can be tracked effectively through the entire tracking sequences. Moreover, in order to further improves the robust of tracking method, temporal information was used in our tracker. Finally, we incorporate weight-based local sparse appearance model and temporal information into the Bayesian inference tracking framework. Experimental result on 2015 PAMI tracking benchmark dataset shows that the propose method achieves approving performance than alternatives reported in the recent literature.
期刊：
Nuclear Science and Engineering,2004年147(1):63-72 ISSN：0029-5639
通讯作者：
Fan, S
作者机构：
[Fan, Sheng] Inst Atom Energy, Beijing 102413, Peoples R China.;Shanghai Univ, Shanghai Appl Radiat Inst, Shanghai 201800, Peoples R China.;Hunan City Univ, Dept Phys, Yiyang 413049, Peoples R China.;N China Elect Power Univ, Beijing 102206, Peoples R China.;NW Univ Xian, Dept Phys, Xian 710006, Peoples R China.
通讯机构：
[Fan, S] Inst Atom Energy, Beijing 102413, Peoples R China.
摘要：
To simplify the calculation, some assumptions are considered in the current work. The preequilibrium emission in the first step in the equilibrium process, which is characterized by exciton n = 3 and "never come back, " is considered in the preequilibrium emission process; the alpha emission is only completed with the neutron and proton emission, and the second particle emission is neglected. Under those assumptions, a semiempirical systematics of the cross section for the (n, a) reaction is obtained on the basis of the evaporation and exciton models for the energies ranging up to 20 Me V Within the nuclide mass region of 23 less than or equal to A < 209, a strong dependence on (N - Z + 1)/A and the incident neutron has been observed. The predictions of the semiempirical systematics with the global parameter of the excitation functions for the (n,alpha) reaction are in good agreement with the experimental data.
作者机构：
[Xu, Xue] Univ Sci & Technol China, Dept Automat, Hefei, Peoples R China.;[Zhang, Jianming] Changsha Univ Sci & Technol, Coll Comp & Commun Engn, Changsha, Peoples R China.;[Yang, Gelan] Hunan City Univ, Dept Comp Sci, Yiyang, Peoples R China.;[Yang, Gang] Ecole Super Elect, Dept Power & Energy Syst, Gif Sur Yvette, France.
会议名称：
17th International Conference on Neural Information Processing, ICONIP 2010
会议时间：
November 22, 2010 - November 25, 2010
会议地点：
Sydney, NSW, Australia
会议主办单位：
(1) Hunan City University, Department of Computer Science, Yiyang, China; (2) University of Science and Technology of China, Department of Automation, Hefei, China; (3) Department of Power and Energy Systems, Ecole Supérieur d'Electricité (Supélec), Gif-sur-Yvette Cedex, France; (4) College of Computer and Communication Engineering, Changsha University of Science and Technology, Changsha, China
会议论文集名称：
Lecture Notes in Computer Science
关键词：
mixture of factor analyzers;local linear coordinate;semi-supervised classification;manifold learning
作者机构：
[Song, Juanjuan] Hunan City Univ, Dept Chem & Environm Engn, Yiyang 413000, Hunan, Peoples R China.;[Tu, Li] Hunan City Univ, Dept Comp Sci, Yiyang 413000, Hunan, Peoples R China.
会议名称：
2011 International Conference on Future Materials Engineering and Industry Application(ICFMEIA 2011)
会议时间：
2011-08-04
会议地点：
Bali Island, Indonesia
关键词：
Modified fly ash;Microwave;Radiation;Cu2+
摘要：
The comprehensive utilization of fly ash mainly concentrated is in construction engineering channels, road engineering, it used to deal with waste water is full of hope. As this, it can achieve the pu
关键词：
Quantum statistical mechanics;Classical ensemble theory;Algebraic structures and number theory
摘要：
With invoking analytical formulae in number theory and numerical calculations, we calculate the number of microstates in microcanonical ensemble for free particles in a single harmonic trap which in whole space defines a thermodynamic system but not a spatially homogeneous one. Once the number of excitation quanta m is larger than the square of the particle number N-2 as m >= O (N-2) when N >> 1, the number of microcanonical microstates for an ideal, harmonically trapped Bose or Fermi gas gradually converge to the Boltzmann microcanonical microstates for the classical particles with a proper consideration of the indistinguishability.
作者机构：
[Yaqing, Chen; Longyang, Huang] Civil Aviat Flight Univ China, Air Traff Management Coll, Guanghan 618307, Sichuan, Peoples R China.;[Mengxing, Li] Hunan City Univ, Dept Phys & Telecommun, Yiyang 413000, Hunan, Peoples R China.
会议名称：
2009 2nd International Congress on Image and Signal Processing, CISP'09
会议时间：
October 17, 2009 - October 19, 2009
会议地点：
Tianjin, China
会议主办单位：
(1) Air Traffic Management College, Civil Aviation Flight Univ. of China, Guanghan, Sichuan, 618307, China; (2) Department of Physics and Telecomm., Hunan City Univ., Yiyang, Hunan, 413000, China
