检索结果-南通市图书馆

Controlled Quantum N-Party Simultaneous Direct Communication

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical physics 2007年第7期48卷 79-82页

作者： XIA Yun-Jie MAN Zhong-Xiao college of physics and {2.,{3. normal university,{3. 2.3.65,China college of physics and {2. Qufu Normal University Qufu 273165 China

In this paper,we propose a controlled quantum N-party simultaneous direct communication protocolwith single-qubit *** users can simultaneously exchange their secret messages in a set of devices withthe control of a **... 详细信息

关键词： direct communication N-party simultaneous

Role of gallium wetting layer in high-quality ZnO growth on sapphire (0001) substrates

在线全文

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & Astronomy) 2004年第5期47卷 612-620页

作者： ZENG Zhaoquan1,3. WANG Yong2. DU Xiaolong1, MEI Zengxia1, KONG Xianghe3. JIA Jinfeng1, XUE Qikun1 & ZHANG Ze2. 4 1. State Key Laboratory for Surface {2., Institute of {2., Chinese Academy of Sciences, Beijing 100080, China 2. Laboratory of Electron Microscopy, Institute of {2., Chinese Academy of Sciences, Beijing 100080, China {3., qufu normal university, qufu 2.3.65, China 4. Beijing university of Technology, Beijing 10002., China State Key Laboratory for Surface physics Institute of Physics Chinese Academy of Sciences Beijing China college of physics and {2. Qufu Normal University Qufu China Laboratory of Electron Microscopy Institute of Physics Chinese Academy of Sciences Beijing China Beijing university of Technology Beijing China

A Ga wetting layer was used to modify the surface structure of sapphire (0001) substrate to prepare high-quality ZnO film by radio frequency plasma-assisted molecule beam epitaxy. We found that this Ga layer plays a crucial role in eliminating 3. rotation domains, controlling polarity and decreasing defect density in ZnO epilayers, as demonstrated by in situ reflection high energy electron diffraction, ex situ high resolution X-ray diffraction and high resolution cross-sectional transmission electron microscopy. Zn-polar film of ZnO was determined by convergent beam electron diffraction. A Ga bilayer model is proposed to understand the effects of the Ga wetting layer on high-quality ZnO growth.

关键词： Ga wetting layer, sapphire, polarity, defect density, zinc oxide, rf-MBE, RHEED, HRXRD, TEM, CBED.

Accurate studies on the full vibrational energy spectra and molecular dissociation energies for some electronic states of N_(2.molecule

在线全文

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & Astronomy) 2005年第4期48卷 385-398页

作者： REN Weiyi1,2. SUN Weiguo1, HOU Shilin3.& FENG Hao4 1. Institute of physics, {2. of Chemical {2., Sichuan {3., Chengdu 610065, China 2. Institute of Theoretical physics, Xihua normal {3., Nanchong 63.002. China 3. Department of physics, China Oceanography {3., Qingdao 2.6003. China 4. {2. of physics, Sichuan {3., Chengdu 610065, China Institute of physics College of Chemical Engineering Sichuan University Chengdu China Institute of Theoretical physics Xihua Normal University Nanchong China Department of physics China Oceanography University Qingdao China college of physics Sichuan University Chengdu China

It is usually very difficult to directly obtain molecular dissociation energy De and all accurate high-lying vibrational energies for most diatomic electronic states using modern experimental techniques or quantum theories, and it is also very difficult to give accurate analytical expression for diatomic molecular dissociation energy. This study proposes a new analytical formula for obtaining accurate molecular dissociation energy based on the LeRoy and Bernstein’s energy expression in dissociation limit. A set of full vibrational energy spectra for some electronic states of N2.molecule are studied using the algebraic method (AM) suggested recently, and the corresponding accurate molecular dissociation energies are evaluated using the proposed new formula and high-lying AM vibrational energies. The results show that the AM spectra and the new theoretical dissociation energies agree excellently with experimental data, and thereby providing a new physical approach to generating accurate dissociation energies for electronic states of diatomic molecules.

关键词： vibrational energy, dissociation energy, nitrogen molecule, algebraic method.

Non-universal Gauge Bosons Z'and the Process e~+e~- →f

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical physics 2004年第3期41卷 419-424页

作者： YUE Chong-Xing~1 WANG Shun-Zhi~2.1 Department of physics,Liaoning normal {2.,Dalian 11602.,China 2.{3. of physics and Information engineering,Henan normal {2.,Xinxiang 453.02.China Department of physics Liaoning Normal University Dalian 116029 college of physics and Information {2. Henan Normal University Xinxiang 453002

Introduetion Altl、ough the standard model(SM)that bases on thega、lge gro、ip SU:(2.xU(1)has been sueeessful in de-seribing the Physies of eleetroweak interaetions,the meeh-anisn,of the eleetroweak symmetry breaking(... 详细信息

关键词： non-universal gauge bosons cross section TC2.models

The dynamical properties of Rydberg hydrogen atom near a metal surface

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & Astronomy) 2005年第6期48卷 667-675页

作者： GE Meihua1, ZHANG Yanhui1, WANG Dehua2. DU Mengli3.& LIN Shenglu1 1. college of {2. and Electronics, Shandong {2. {3., Jinan 2.0014, China 2. Department of Mathematics and {2., Shandong Institute of Architecture and engineering, Jinan 2.0014, China 3. Institute of Theoretical {2., Chinese Academy of Sciences, Beijing 100080, China college of physics and Electronics Shandong Normal University Jinan China Department of Mathematics and physics Shandong Institute of Architecture and Engineering Jinan China Institute of Theoretical physics Chinese Academy of Sciences Beijing China

The dynamical properties of Rydberg hydrogen atom near a metal surface are presented by using the methods of phase space analysis and closed orbit theory. Transforming the coordinates of the Hamiltonian, we find that the phase space of the system is divided into vibrational and rotational region. Both the Poincaré surface of section and the closed orbit theory verify the same conclusion clearly. In this paper we choose the atomic principal quantum number as n = 2.. The dynamical character of the exited hydrogen atom depends sensitively on the atom-surface distance d. When d is sufficiently large, the atom-surface potential can be expressed by the traditional van der Waals force and the system is integrable. When d becomes smaller, there exists a critical value dc. For d > dc, the system is near-integrable and the motion is regular. While chaotic motion appears for d < dc, and the system tends to be non-integrable. The trajectories become unstable and the electron might be captured onto the metal surface.

关键词： Rydberg hydrogen atom, van der Waals interaction, Poincaré surface of section, closed orbit theory, chaos.

Robustness and breakup of the spiral wave in a two-dimensional lattice network of neurons

在线全文

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & Astronomy) 2010年第4期53卷 672-679页

作者： MA Jun 1,2. TANG Jun 2., ZHANG AiHua 3.& JIA Ya 2.1 Department of physics, Lanzhou {2. of Technology, Lanzhou 73.050, China 2.Department of physics, Central China {3. {2., Wuhan 43.079, China 3.college of Electrical and Information engineering, Lanzhou {2. of Technology, Lanzhou 73.050, China Department of physics Lanzhou University of Technology Lanzhou China Department of physics Central China Normal University Wuhan China college of Electrical and Information engineering Lanzhou University of Technology Lanzhou China

The robustness and breakup of spiral wave in a two-dimensional lattice networks of neurons are investigated. The effect of small- world type connection is often simplified with local regular connection and the long-range connection with certain probability. The network effect on the development of spiral wave can be better described by local regular connection and changeable long-range connection probability than fixed long-range connection probability because the long-range probability could be changeable in realistic biological system. The effect from the changeable probability for long-range connection is simplified by multiplicative noise. At first, a stable rotating spiral wave is developed by using appropriate initial values, parameters and no-flux boundary conditions, and then the effect of networks is investigated. Extensive numerical studies show that spiral wave keeps its alive and robust when the intensity of multiplicative noise is below a certain threshold, otherwise, the breakup of spiral wave occurs. A statistical factor of synchronization in two-dimensional array is defined to study the phase transition of spiral wave by checking the membrane potentials of all neurons corresponding to the critical parameters(the intensity of noise or forcing current)in the curve for factor of synchronization. The Hindmarsh-Rose model is investigated, the Hodgkin-Huxley neuron model in the presence of the channel noise is also studied to check the model independence of our conclusions. And it is found that breakup of spiral wave is easier to be induced by the multiplicative noise in presence of channel noise.

关键词： spiral wave factor of synchronization breakup multiplicative noise robustness

A Convergent Algorithm for Continuously Optimal Location Problem

在线全文

学校读者我要写书评

暂无评论

Systems Science and Systems engineering 1999年第3期9卷 378-384页

作者： MENG Ling\|he\+1\ \ SHI Zhen\|jun\+2. \ WANG Chang\|yu\+3.1. Qingdao Educational college, Qingdao 2.6001, China 2. Institute of Operations Research,{2.,{2., China 3. Institute of Applied Mathematics, Academia Sinica, B

In this paper, the continuously optimal location problem is considered. The strong convexity of the objective function, the Lipschitz continuity of the gradient of the objective function are proved. Furthermore, a variant of conjugate gradient method for continuously optimal location problem is presented and its global convergence is analyzed.

关键词： continuously optimal location problem variant of conjugate gradient method steplength global convergence

Quantum secret sharing between m-party and n-party with six states

在线全文

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & Astronomy) 2009年第8期52卷 1191-1202页

作者： GAO Ting1,YAN FengLi2.3.& LI YouCheng2.3.1 {2. of Mathematics and Information Science,Hebei normal {2.,Shijiazhuang 050016,China 2.{2. of physics and Information engineering,Hebei normal {2.,Shijiazhuang 050016,China 3.Hebei Advanced Thin Films Laboratory,Shijiazhuang 050016,China college of Mathematics and Information Science Hebei Normal University Shijiazhuang China college of physics and Information {2. Hebei Normal University Shijiazhuang China Hebei Advanced Thin Films Laboratory Shijiazhuang China

A quantum secret sharing scheme between an m-party group and an n-party group is proposed using three conjugate bases.A sequence of single photons,each of which is prepared in one of the six states,is used directly to encode classical information in the quantum secret sharing *** this scheme,each of all m members in group 1 chooses randomly his/her own secret key individually and independently,and directly encodes his/her respective secret information on the states of single photons via unitary operations,then the last one sends 1/n of the resulting qubits to each member of group *** measuring their respective qubits,all members in group 2.share the secret information shared by all members in group *** renders impossible a Trojan horse attack with a multi-photon signal,a fake-signal attack with EPR pairs,an attack with single photons,and an attack with invisible *** give the upper bounds on the average success probabilities for dishonest agent eavesdropping encryption using the fake-signal attack with any two-particle entangled states.

关键词： quantum secret sharing security EPR pairs

A generalized Weyl-Wigner quantization scheme unifying P-Q and Q-P ordering and Weyl ordering of operators

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2012年第6期21卷 207-212页

作者：王继锁范洪义孟祥国 Shandong Provincial Key Laboratory of Laser Polarization and Information Technology College of Physics and EngineeringQufu Normal University Department of physics Liaocheng University Department of physics Shanghai Jiao Tong University

By extending the usual Wigner operator to the s-parameterized one as 1/4π2.integral （dyduexp [iu（q-Q）＋iy（p-P）＋is/2.u]） from n=- ∞ to ∞ with s beng a,real parameter,we propose a generalized Weyl quantization scheme which accompanies a new generalized s-parameterized ordering *** rule recovers P-Q ordering,Q-P ordering,and Weyl ordering of operators in s = 1,1,0 *** it differs from the Cahill-Glaubers’ ordering rule which unifies normal ordering,antinormal ordering,and Weyl *** also show that in this scheme the s-parameter plays the role of correlation between two quadratures Q and *** formula that can rearrange a given operator into its new s-parameterized ordering is presented.

关键词： generalized Wigner operator generalized operator ordering rule bivariate normal dis-tribution