检索结果-南通市图书馆

Multiparty quantum secret conference based on quantum encryption with pure entangled states

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2009年第6期18卷 2137-2142页

作者：顾斌李传起陈玉林 college of math and Physics Nanjing University of Information Science and Technology

We present a scheme for multiparty quantum remote secret conference （MQRSC） with pure entangled states, not maximally entangled multipartite quantum systems. The conferees first share a private quantum key, a sequence of pure entangled states and then use them to encode and decode the secret messages. The conferees exploit the decoy-photon technique to ensure the security of the transmission of qubits. This MQRSC scheme is more feasible and efficient than others.

关键词： quantum secret conference pure entangled states quantum encryption

Fractal dimension of scattering equivalent section of aerosol and its calibration mechanism

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2009年第9期7卷 857-860页

作者：顾芳张加宏陈玉林 college of math & Physics Nanjing University of Information Science & Technology college of Electronic & information Engineering Nanjing University of Information Science & Technology

The correct calibration of coefficients in the inversion model for aerosol mass concentration is the precondition of obtaining highly precise results. The concept of the fractal dimension of scattering equivalent section is presented, and the calibration mechanism of the fractal dimension is discussed. Based on the calibration mechanism, the stability of the fractal dimension is analyzed. Theoretical analysis and experimental results indicate that the fractal dimension obtained by the intersection point calibration method is stable, while that calibrated by the Gauss-Newton method is instable, which only describes the shape characteristic of a small sample. The study of the calibration mechanism for the fractal dimension markedly enhances the present model for aerosol mass concentration.

关键词： Atmospheric aerosols Calibration Newton Raphson method Partial discharges

High-capacity three-party quantum secret sharing with superdense coding

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2009年第11期18卷 4690-4694页

作者：顾斌李传起徐飞陈玉林 college of math and Physics Nanjing University of Information Science and Technology (NUIST)

This paper presents a scheme for high-capacity three-party quantum secret sharing with quantum superdense coding, following some ideas in the work by Liuet al （2002 Phys. Rev. A 65 022304） and the quantum secret sharing scheme by Deng et al （2008 Phys. Lett. A 372 1957）. Instead of using two sets of nonorthogonal states, the boss Alice needs only to prepare a sequence of Einstei^Podolsky-l^osen pairs in d-dimension. The two agents Bob and Charlie encode their information with dense coding unitary operations, and security is checked by inserting decoy photons. The scheme has a high capacity and intrinsic efficiency as each pair can carry 21bd bits of information, and almost all the pairs can be used for carrying useful information.

关键词： quantum secret sharing three-party high-capacity superdense coding

A Universal Formula for the Secondary Electron Yield of Metals at an Incident Angle of θ

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2011年第9期28卷 253-256页

作者： XIE Ai-Gen ZHANG Jian WANG Tie-Bang college of math and Physics Nanjing University of Information Science and TechnologyNanjing 210044

Based on the main physical processes,we deduce the relationships among the incident energy Wp0 of the primary electron,the number of released secondary electrons(i.e.δ_(PEθ))per primary electron entering the metal at incident angleθand the angleθ*** addition,the relationship ofδPEθatθ=0°,i.e.δ_(PE0),with Wp0 is *** the experimental results,the relationship of the ratio atθ=0°,i.e.β_(0) which is the ratio of the average number of released secondary electrons generated by a single primary electron backscattered at the metal surface to that generated by a single primary electron entering the metal,with Wp0 is ***,the relationships among the ratioβθ,Wp0 andθare *** on the relationships among the secondary electron yield atθ(i.e.δθ),the yield atθ=0°(i.e.δ_(0)),the backscattering coefficient atθ(i.e.η_(θ)),the coefficient atθ=0°(i.e.η0),δ_(PEθ)andδ_(PE0),we deduce the universal formula forδ_(θ),δ_(0),η_(θ),η_(0),and W_(p0) for the primary electrons at an incident energy of 2–10 *** secondary electron yields calculated from the universal formula and the experimental yields of some metals are compared,and the results suggest that the proposed formula is universal for estimation of secondary electron yields atθ=0°−80°.

关键词： incident deduce coefficient

Deterministic secure quantum communication over a collective-noise channel

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2009年第12期52卷 1913-1918页

作者： GU Bin PEI ShiXin SONG Biao ZHONG Kun college of math and Physics Nanjing University of Information Science and TechnologyNanjing 210044China

We present two deterministic secure quantum communication schemes over a collective-noise. One is used to complete the secure quantum communication against a collective-rotation noise and the other is used against a collective-dephasing noise. The two parties of quantum communication can exploit the correlation of their subsystems to check eavesdropping efficiently. Although the sender should prepare a sequence of three-photon entangled states for accomplishing secure communication against a collective noise,the two parties need only single-photon measurements,rather than Bell-state measurements,which will make our schemes convenient in practical application.

关键词： deterministic secure quantum communication quantum secure direct communication collective-noise channel single-photon measurements

Genetic algorithm-based wide-band deterministic maximum likelihood direction finding algorithm

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2005年第3期16卷 510-514页

作者：李福昌赵春晖 coll .of information &Communication Engineering Harbin Engineering Univ

The wide-band direction finding is one of hit and difficult task in array signal processing. This paper generalizes narrow-band deterministic maximum likelihood direction finding algorithm to the wideband case, and so constructions an object function, then utilizes genetic algorithm for nonlinear global optimization. Direction of arrival is estimated without preprocessing of array data and so the algorithm eliminates the effect of pre-estimate on the final estimation. The algorithm is applied on uniform linear array and extensive simulation results prove the efficacy of the algorithm. In the process of simulation, we obtain the relation between estimation error and parameters of genetic algorithm.

关键词： wide-band direction finding deterministic maximum likelihood genetic algorithm.

Genetic algorithmcombined with immune mechanism and its application in skill fuzzy control

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2005年第3期16卷 600-605页

作者：武晓今张火召朱仲英 coll .of Electronic information &Electricity Engineering Shanghai Jiaotong Univ

Automation of skill fuzzy control system is an important research aspect of fuzzy control fields. It＇s significant for those control instances consisted in production and people＇s daily life. But, how to control a system not movement or behavior rules but only relied on movement parameters, that problem still had not be resolved. This paper proposes a new method used a genetic algorithm based on immune mechanism to learn the degree of membership, at same time, simplifying the corresponding movement equation; its efficiency will be indicated by an example.

关键词： immune GA affinity function problem-space and GA-space skill fuzzy control.

Influences of surface effects and large deformation on the resonant properties of ultrathin silicon nanocantilevers

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2012年第1期21卷 363-373页

作者： Zhang Jia-Hong Li Min Gu Fang Liu Qing-Quan Jiangsu Key Laboratory of Meteorological Observation and information Processing Nanjing University of Information Science&TechnologyNanjing 210044China college of math&Physics Nanjing University of Information Science&TechnologyNanjing 210044China

The purpose of the present work is to quantify the influences of the discrete nature, the surface effects, and the large deformation on the bending resonant properties of long and ultrathin （100） silicon nanocantilevers. We accomplish this by using an analytical semi-continuum Keating model within the framework of nonlinear, finite deformation kinematics. The semi-continuum model shows that the elastic behaviors of the silicon nanocantilevers are size-dependent and surface- dependent, which agrees well with the molecular dynamics results. It also indicates that the dominant effect on the fundamental resonant frequency shift of the silicon nanocantilever is adsorption-induced surface stress, followed by the discrete nature and surface reconstruction, whereas surface relaxation has the least effect. In particular, it is found that a large deformation tends to increase the nonlinear fundamental frequency of the silicon nanocantilever, depending not only on its size but also on the surface effects. Finally, the resonant frequency shifts due to the adsorption-induced surface stress predicted by the current model are quantitatively compared with those obtained from the experimental measurement and the other existing approach. It is noticed that the length-to-thickness ratio is the key parameter that correlates the deviations in the resonant frequencies predicted from the current model and the empirical formula.

关键词： resonant properties elastic properties surface effects silicon nanocantilevers

Decomposition of λK_v into Five Graphs with Six Vertices and Eight Edges

在线全文

学校读者我要写书评

暂无评论

Acta mathematicae Applicatae Sinica 2012年第4期28卷 823-832页

作者： Lan-dang YUAN Qing-de KANG college of mathematics and information Science Hebei Normal University Institute of math. Hebei Normal University

In this paper, we discuss the G-decomposition of λKv （G-GD）, （v）） into five graphs with six vertices and eight edges. We present some recursive structures and a number of G-designs of small orders, holey G- designs, and incomplete G-designs are constructed. Finally, the spectrum of the existence of G-GD）λ（v） is determined.

关键词： graph design holey graph design quasi-group