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原子物理理论在核磁共振中的应用
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作者 孙利平 张海涛 《长沙大学学报》 2000年第2期39-43,共5页
本文以原子物理的相关理论为基础 ,简单的讲述了核磁共振的原理 。
关键词 核自旋 核磁矩 核磁共振 自旋偶合 原子物理理论
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Duality Computing in Quantum Computers 被引量:9
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作者 LONG Gui-Lu LIU Yang 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第12期1303-1306,共4页
In this letter,we propose a duality computing mode,which resembles particle-wave duality property whena quantum system such as a quantum computer passes through a double-slit.In this mode,computing operations arenot n... In this letter,we propose a duality computing mode,which resembles particle-wave duality property whena quantum system such as a quantum computer passes through a double-slit.In this mode,computing operations arenot necessarily unitary.The duality mode provides a natural link between classical computing and quantum computing.In addition,the duality mode provides a new tool for quantum algorithm design. 展开更多
关键词 duality computer duality quantum computer duality computing mode
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Double—Pulse Spectra and Closed—Orbits:Photodetachment of H^— in parallel Electric and Magnetic Fields 被引量:5
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作者 DUMeng-Li 《Communications in Theoretical Physics》 SCIE CAS CSCD 2003年第6期705-708,共4页
We derive a formula for double-pulse spectra from closed-orbit theory. We then calculate the double-pulse photodetachment spectra of H<SUP>?</SUP> in the presence of parallel electric and magnetic fields. ... We derive a formula for double-pulse spectra from closed-orbit theory. We then calculate the double-pulse photodetachment spectra of H<SUP>?</SUP> in the presence of parallel electric and magnetic fields. We analyze the spectra in terms of closed-orbits of the system. We suggest a method for the measurement of a phase associated with each closed-orbit. 展开更多
关键词 closed-orbit theory PHOTODETACHMENT Stark effect
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Application of Exp-Function Method to Discrete Nonlinear Schrdinger Lattice Equation with Symbolic Computation 被引量:2
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作者 JI Jie 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第12期1279-1282,共4页
In this paper, we present an extended Exp-function method to differential-difference equation(s). With the help of symbolic computation, we solve discrete nonlinear Schrodinger lattice as an example, and obtain a se... In this paper, we present an extended Exp-function method to differential-difference equation(s). With the help of symbolic computation, we solve discrete nonlinear Schrodinger lattice as an example, and obtain a series of general solutions in forms of Exp-function. 展开更多
关键词 Exp-function solutions discrete nonlinear SchrSdinger lattice equation
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Study on Production of Exotic 0^+ Meson D'^*aj(2317) in Decays of ψ(4415) 被引量:1
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作者 GUO Xin-Heng KE Hong-Wei +2 位作者 LI Xue-Qian LIU Xiang ZHAO Shu-Min 《Communications in Theoretical Physics》 SCIE CAS CSCD 2007年第3X期509-518,共10页
The newly observed D^*aj family containing D^*aj(2317), Daj(2460), and Daj(2632) attracts great interests. Determining their structures may be an important task for both theorists and experimentalists. In this... The newly observed D^*aj family containing D^*aj(2317), Daj(2460), and Daj(2632) attracts great interests. Determining their structures may be an important task for both theorists and experimentalists. In this work we use a non-relativistic model (the harmonic oscillator model) to evaluate the production rate of D^*aj (2317) from the decays of ψ(4415). For a comparison, we a/so employ the widely adopted heavy quark effective theory to repeat the calculation. We lind that the rate is sizable and may be observed at BES III and CLEO, if it is a p-wave excited state of Da(1968). Unfortunately, the other two members of the family cannot be observed through decays of charmonia, because of the constraints from the final state phase space. 展开更多
关键词 exotic meson quark-pair-creation model heavy quark effective theory
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Mobility in Driven Frenkel-Kontorova Model
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作者 滕爱萍 马桂花 许爱国 《Journal of China University of Mining and Technology》 2002年第2期203-209,共7页
The transport properties in a kind of simple system are studied within the framework of a generalized Frenkel Kontorova model where the chain is composed of two kinds of atoms. Its studied mobility includes two aspect... The transport properties in a kind of simple system are studied within the framework of a generalized Frenkel Kontorova model where the chain is composed of two kinds of atoms. Its studied mobility includes two aspects: the velocity mobility B v and the momentum mobility B m . The effective system temperatures for the two subchains, T e 1 and T e 2 are defined, respectively. For the underdamped case, the regime of nonlinear response becomes wider and more "steps" occur when the value of m increases. For m = 1, T e 1(F) = T e 2(F) . For m >1, T e 1(F) > T e 2(F) and the difference increases with the increase of m . The momentum transportation shows very different behavior from that of the velocity transportation. Within a prescribed intermediate "steps" of B v(F) or B m(F) , both of them decrease with the increase of F and B m(F) decreases more quickly. For the case of overdamping and nonzero temperature, the hysteresis interval becomes thinner and the transitions become smoother. The increase of m makes the hysteresis thinner and the transitions smoother. When T is high, all the transitions are smeared out, and the diatomic effects become unimportant. We expect these results contribute to the understanding of the atomic processes occurring at the interface of two materials when they are brought together and moved with respect to one another. 展开更多
关键词 Frenkel Kontorova model atom physics
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Formation Mechanism and Binding Energy for Regular Octahedral Structure of Li_6 Cluster
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作者 ZHAO Yan-Ping LI Ping GOU Qing-Quan LIU Wei-Na 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第12期1407-1410,共4页
The formation mechanism for the regular octahedral structure of Liscluster is proposed. The curve of the total energy versus the separation R between any two neighboring nuclei has been calculated by using the method ... The formation mechanism for the regular octahedral structure of Liscluster is proposed. The curve of the total energy versus the separation R between any two neighboring nuclei has been calculated by using the method of Gou's modified arrangement channel quantum mechanics (MACQM). The result shows that the curve has a minimal energy of -44.736 89 a.u. at R = 5.07a0. When R approaches infinity, the total energy of six lithium atoms has the value of -44.568 17 a.u. So the binding energy of Li6 with respect to six lithium atoms is 0.1687 a.u. Therefore, the binding energy per atom for Li6 is 0.028 12 a.u., or 0.7637 eV, which is greater than the binding energy per atom of 0.453 eV for Li2 and the binding energy per atom of 0.494 eV for Li3 calculated in our previous work. This means that the Li6 cluster may be formed in a regular octahedral structure with a greater binding energy. 展开更多
关键词 Li6 cluster formation mechanism binding energy
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Properties of Unsymmetrical Parabolic Confinement Potential Quantum Dot Qubit
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作者 CHEN Shi-Hua XIAO Jing-Lin 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第12期1287-1289,共3页
On the condition of electric-LO phonon strong coupling in unsymmetrical parabolic confinement potential quantum dot (QD), we obtain the eigenenergies of the ground state and the first-excited state, the eigenfunctio... On the condition of electric-LO phonon strong coupling in unsymmetrical parabolic confinement potential quantum dot (QD), we obtain the eigenenergies of the ground state and the first-excited state, the eigenfunctions of the ground state, and the first-excited state by using variational method of Pekar type. This system in QD may be employed as a two-level quantum system-qubit. When the electron is in the superposition state of the ground state and the first-excited state, we obtain the time evolution of the electron density. The relations both the probability density of electron and the period of oscillation with the electron-LO-phonon coupling strength, the confinement strengths in the xy-plane and the z-direction are discussed. 展开更多
关键词 quantum dot QUBIT binding energy
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Finite Nuclei in a Relativistic mean—Field Theory with quadratic Couplings
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作者 GUOHua YANGShu 《Communications in Theoretical Physics》 SCIE CAS CSCD 2001年第5期573-578,共6页
A quadratic scalar and vector coupling model proposed recently has been applied to finite nuclei.The calculated results are compared with those of the derivative scalar coupling (DSC) model and the nonlinear Walecka m... A quadratic scalar and vector coupling model proposed recently has been applied to finite nuclei.The calculated results are compared with those of the derivative scalar coupling (DSC) model and the nonlinear Walecka model The results show that the spin-orbit splittings are improved considerably by quadratic couplings in contrast to the DSC model However,the binding energy per nucleon,rms charge radius,as well as the spin-orbit splittings in the quadratic model are still small compared with those given by the nonlinear Walecka model and the experimental data. 展开更多
关键词 quadratic couplings spin-orbit splittings binding energy rms charge radius
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Cooling Curve of Strange Star in Strong Magnetic Field
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作者 WANG Xiao-Qin LUO Zhi-Quan 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第11期1255-1257,共3页
In this paper, firstly, we investigate the neutrino emissivity from quark Urca process in strong magnetic field. Then, we discuss the heat capacity of strange stars in strong magnetic field. Finally, we give the cooli... In this paper, firstly, we investigate the neutrino emissivity from quark Urca process in strong magnetic field. Then, we discuss the heat capacity of strange stars in strong magnetic field. Finally, we give the cooling curve in strong magnetic field. In order to make a comparison, we also give the corresponding cooling curve in the case of null magnetic field. It turns out that strange stars cool faster in strong magnetic field than that without magnetic field. 展开更多
关键词 strong magnetic field strange star QUARK
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Description of Rotation Bands in ^(157,158)Er at Ultrahigh Spin
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作者 ZHANG Da-Li 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第12期1391-1395,共5页
Properties of the four rotation bands, ^157Er(1,2) and ^15SEr(1,2), at ultrahigh spin are investigated within the supersymmetry scheme including many-body interactions and possessing the SO(5) (or SU(5)) sym... Properties of the four rotation bands, ^157Er(1,2) and ^15SEr(1,2), at ultrahigh spin are investigated within the supersymmetry scheme including many-body interactions and possessing the SO(5) (or SU(5)) symmetry on the rotational symmetry. Quantitatively good results of the 7-ray energies and the dynamical moments of inertia in the rotation bands in ^157 Er and ^158 Er at ultrahigh spin are obtained. We theoretically predict that the competition between the anti-pairing and pairing effects may exist in ^157 Er(1,2) and ^158Et(2) bands states. In ^158Er(1) band state, the favourepairing effects may exist and the SO(5) (or SU(5)) symmetry play a dominant role. There may be sphere coexisting with headecupole deformed in ^158Et(1) rotation band state. 展开更多
关键词 ^157 158Er rotation bands v-ray energies dynamical moments of inertia ultrahigh spin
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Topological Excitation in Skyrme Theory
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作者 DUAN Yi-Shi ZHANG Xin-Hui LIU Yu-Xiao 《Communications in Theoretical Physics》 SCIE CAS CSCD 2007年第1期85-88,共4页
Based on the C-mapping topological current theory and the decomposition of gauge potential theory, we investigate knotted vortex lines and monopoles in Skyrme theory and simply discuss the branch processes (splitting... Based on the C-mapping topological current theory and the decomposition of gauge potential theory, we investigate knotted vortex lines and monopoles in Skyrme theory and simply discuss the branch processes (splitting, merging, and intersection) during the evolution of the monopoles. 展开更多
关键词 Skyrme theory KNOTS MONOPOLES
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Resonant Continuum in Extended RMF Plus BCS Approximation
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作者 CAOLi-Gang MAZhong-Yu 《Communications in Theoretical Physics》 SCIE CAS CSCD 2004年第4期583-586,共4页
The contribution of the resonant continuum to pairing correlations is investigated in the relativistic mean field theory plus Bardeen–Cooper–Schrieffer (BCS) approximation with a constant pairing strength. The reson... The contribution of the resonant continuum to pairing correlations is investigated in the relativistic mean field theory plus Bardeen–Cooper–Schrieffer (BCS) approximation with a constant pairing strength. The resonance states with their widths in the continuum are considered explicitly. The numerical study is performed in an effective Lagrangian with the parameter set NLSH for neutron-rich nucleus <SUP>84</SUP>Ni. The results show that the effect of the proper treatment of the resonant continuum on pairing correlations for nucleus close to neutron drip line is important. It is found that the problem of an unphysical particle gas could be overcome when the pairing correlation is performed by using the resonant states instead of the discretized states in the continuum. 展开更多
关键词 resonant continuum relativistic mean-field pairing correlations
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Control of Beam Halo-Chaos by Fraction Power-Law Function in Hackle Periodic-Focusing Channel
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作者 YU Hai-Jun BAI Long +2 位作者 WENG Jia-Qiang LUO Xiao-Shu FANG Jin-Qing 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第12期1365-1368,共4页
The Kapchinsky Vladimirsky(K-V)beam through a hackle periodic-focusing magnetic field is studiedusing the particle-core model.The beam halo-chaos is found,and an idea of fraction power-law function controller ispropos... The Kapchinsky Vladimirsky(K-V)beam through a hackle periodic-focusing magnetic field is studiedusing the particle-core model.The beam halo-chaos is found,and an idea of fraction power-law function controller isproposed based on the mechanism of halo formation and the strategy of controlling halo-chaos.The method is appliedto the multi-particle simulation to control the halo.The numerical results show that the halo-chaos and its regenerationcan be eliminated effectively by using the fraction power-law function control method.At the same time,the radialparticle density is uniform at the beam's center as long as the control method and appropriate parameter are chosen. 展开更多
关键词 beam halo-chaos hackle periodic-focusing magnetic field fraction power-law function
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Muon g - 2 in the Littlest Higgs Model
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作者 Farshid Tabbakh LIU Jing-Jing MA Wen-Gan 《Communications in Theoretical Physics》 SCIE CAS CSCD 2006年第5期894-900,共7页
In this paper the anomalous magnetic dipole moment ofmuon in the littlest Higgs (LH) model is studied at one-loop level. We discuss the dependence of the contributions on the global symmetry breaking scale f, mizing... In this paper the anomalous magnetic dipole moment ofmuon in the littlest Higgs (LH) model is studied at one-loop level. We discuss the dependence of the contributions on the global symmetry breaking scale f, mizing angles c` and , and the Higgs triplet vacuum expectation value v' in the electroweak precision data preferring ranges. We find that the LH model can give a relatively small, but non-negligible extra weak contribution to the muon anomalous magnetic moment and can reduce the deviation of △aμ from 2.6σ for the SM to 2.5σ for the LH model. 展开更多
关键词 Littlest Higgs model anomalous magnetic dipole moment of muon
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