Energy Levels of Strong Coupling Magnetopolaron in Quantum Dot

By using variational method of Pekar type,we have studied the energy levels of strong coupling magnetopolaron in diskshape quantum dot(QD) and quantum well(QW),our esults show that ,with the increasing magnetic field and confinement strength,the magnetopolaron binding energy of QD and QW in the ground state and in the excited state is enhanced.The limiting results of bulk type and strict two-dimensional type are obtained.     

光学参量下转换的动力学及其产生的光在演示EPR佯谬中的理论研究

Parametric down-conversion is a useful method to obtain non-classical state in quantum optics. （1） An analytical solution to the Fokker-Planck equation of non-degenerate optical parametric amplification （NOPA） for generation of squeezed light is presented. The maximum intra-cavity compression of squeezed light derived from the analytical solution is 1/16 （vacuum fluctuations 1/4）. To compare it with the previous 1/8 of degenerate optical parametric amplification （DOPA）, it seems that squeezing for NOPA is superior to DOPA.     

光学参量下转换的动力学及其产生的光在演示EPR佯谬中的理论研究(英文)

Parametric down-conversion is a useful method to obtain non-classical state in quantum optics. (1)An analytical solution to the Fokker-Planck equation of non-degenerate optical parametric ampli- fication(NOPA)for generation of squeezed light is     

激光等离子体相互作用的有效度规

The interactions of laser field with plasma are studied by using the analog model of gravity. The interactions of laser field with plasma are regarded as an equivalent effective geometry. An effective metric for a plasma electron is developed. Validity of the metric is confirmed in the limit of non-relativity. The three-dimensional equation of motion for a plasma electron is derived from the general covariant equation of motion. The ponderomotive force and the Abraham＇s force are directly obtained from the three-dimensional equation.     

基于MPI的并发面向对象设计

Object-oriented model possesses inherent concurrency. Integration of concurrency and object-orientation is a promising new field. MPI is a message-passing standard and has been adopted by more and more systems. This paper proposes a novel approach to realize concurrent object-oriented programming based on Message-passing interface(MPI) in which future method communication is adopted between concurrent objects. A state behavior set is proposed to solve inheritance anomaly, and a bounded buffer is taken as an example to illustrate this proposal. The definition of ParaMPI class, which is the most important class in the concurrent class library,and implementation issues are briefly described.     

Stress analysis of anisotropic thick laminates in cylindrical bending using a semi-analytical approach

Semi-analytical elasticity solutions for bending of angle-ply laminates in cylindrical bending are presented using the state-space-based differential quadrature method (SSDQM). Partial differential state equation is derived from the basic equations of elasticity based on the state space concept. Then, the differential quadrature (DQ) technique is introduced to discretize the longitu- dinal domain of the plate so that a series of ordinary differential state equations are obtained at the discrete points. Meanwhile, the edge constrained conditions are handled directly using the stress and displacement components without the Saint-Venant principle. The thickness domain is solved analytically based on the state space formalism along with the continuity conditions at interfaces. The present method is validated by comparing the results to the exact solutions of Pagano’s problem. Numerical results for fully clamped thick laminates are presented, and the influences of ply angle on stress distributions are discussed.     

Modeling of D-STATCOM in distribution systems load flow

This paper presents modeling of Distribution STATCOM (D-STATCOM) in load flow calculations for the steady- state voltage compensation. An accurate model for D-STATCOM is derived to use in load flow calculations. The rating of this device as well as the direction of required reactive power injection for voltage compensation in the desired value (1 p.u.) is de- rived and discussed analytically and mathematically by the phasor diagram method. Furthermore, an efficient method for node and line identification used in load flow calculations is presented. The validity of the proposed model is examined by using two standard distribution systems consisting of 33 and 69 nodes, respectively. The best location of D-STATCOM for under voltage problem mitigation approach in the distribution networks is determined. The results validate the proposed model for D- STATCOM in large distribution systems.     

克尔介质腔中耦合三能级原子与光场相互作用系统的动力学行为

The Hamiltonian of coupled three-level atoms interacting with light field in the cavity filled with Kerr-like medium is derived. A simplified analytic solution to the Schrodinger equation of the system is obtained. The case of A type atom with degenerate lower levels is discussed in detail. It is shown that the coupling strength between atoms and Kerr coefficient affect the system＇s dynamic behaviors, especially the modulation period and oscillation frequency of the squeezing parameters of the field and the collective dipole moment. Dynamic behaviors of the system are sensitive to the initial state of atoms.     

Quantum chemical study on asymmetric allylation of benzaldehyde in the presence of chiral allylboronate

The quantum chemical method is employed to study the modified asymmetric allylation of benzaldehyde controlled by diisopropyl D-(-)-tartrate auxiliary. All the structures are optimized completely at the B3LYP/6-31G(d,p) level. The (R)-secondary alcohol can be achieved mainly through a six-membered ring chair-like transition state structure. From the relative reaction rates theory the main product configuration predicted is in agreement with the experiment result.     

具有Stark位移的非线性双光子Jaynes-Cummings模型

Two-photon Jaynes-Cummimgs model is generalized to the case of Kerr medium in this paper,The field and atom are prepared initially in two-photon superposition state and ground state respectively.Nonlinear coefficient affects the dynamic behaviors of the field and atom.Evolutions of the squeezing for the operators of field and atom and the quantum inversion are discussed.In particular,the higher-order squeezing for atomic dipole and the effects of nonlinearity on it,which have not been studied by other authors,are investigated,Increasing the nonlinear coefficient will decrease the squeezing depth of atomic dipole.     

基于EPR对的多比特量子隐形传态方案

提出了一种多比特未知量子态的隐形传送方案.方案中,用EPR对纠缠态的直积态来传输一个未知信息粒子的量子态,通过N次联合测量与么正操作,实现N比特未知量子态的传输,与单粒子量子态传输相比,多比特量子态可以传送更多信息.     

水下声散射一致性时域有限差分法的并行算法

In this work, we treat scattering objects, water, surface and bottom in a truly unified manner in a parallel finite-difference time-domain (FDTD) scheme, which is suitable for distributed parallel computing in a message passing interface(MPI) programming environment. The algorithm is implemented on a cluster-based high performance computer system.Parallel computation is performed with different division methods in 2D and 3D situations. Based on analysis of main factorsaffecting the speedup rate and parallel efficiency, data communication is reduced by selecting a suitable scheme of task division.A desirable scheme is recommended, giving a higher speedup rate and better efficiency. The results indicate that the unifiedparallel FDTD algorithm provides a solution to the numerical computation of acoustic scattering.     

FURTHER DEVELOPMENT OF USSR'S HIGHER EDUCATION BASED ON THE DECISIONS OF THE CENTRAL COMMITTEE OF THE COMMUNIST PARTY AND THE COUNCIL OF MINISTERS OF USSR

In July 1979 the Central Committee of the Communist Party of the USSR and the Council of Ministers of the USSR adopted the document “ On further development of higher education and improvement of the training of specialists”. The main elements of this policy paper are presented in an article written for “Higher Education in Europe” by Professor Felix M. Volkov, Vice‐Rector of Moscow State University. Professor Volkov is also a Member of the CEPES Advisory Committee.     

一维无限深势阱模型的进一步讨论

一维无限深势阱模型是量子力学中重要的问题之一,使用坐标一动量不确定度关系和算符理论分别证明了能量E大于0,并时该模型中的定态波函数、物理量量子化、能级间隔、零点能、坐标一动量不确定度关系以及一维无限深势阱模型成立的条件作了进一步的讨论.     

LMI-based approach for global asymptotic stability analysis of continuous BAM neural networks

Studies on the stability of the equilibrium points of continuous bidirectional associative memory (BAM) neural network have yielded many useful results. A novel neural network model called standard neural network model (SNNM) is ad- vanced. By using state affine transformation, the BAM neural networks were converted to SNNMs. Some sufficient conditions for the global asymptotic stability of continuous BAM neural networks were derived from studies on the SNNMs’ stability. These co…     

Forward and backward models for fault diagnosis based on parallel genetic algorithms

In this paper, a mathematical model consisting of forward and backward models is built on parallel genetic algorithms （PGAs） for fault diagnosis in a transmission power system. A new method to reduce the scale of fault sections is developed in the forward model and the message passing interface （MPI） approach is chosen to parallel the genetic algorithms by global single-population master-slave method （GPGAs）. The proposed approach is applied to a sample system consisting of 28 sections, 84 protective relays and 40 circuit breakers. Simulation results show that the new model based on GPGAs can achieve very fast computation in online applications of large-scale power systems.     

相对论与量子力学的关系及理论的发展

相对论和量子力学之间的关系,既是密切联系的,有时又彼此不相容,特别是测不准关系和光速不变.由此论述了超弦、环等量子引力理论.最后论证了由D irac负能态推导出的负物质是一种暗物质的可能性.     

中国钢铁业上市公司的生产力和生产效率——基于DEA-TOBIT两步法的实证研究

钢铁工业是国民经济发展的重要基础产业,是一国经济社会发展水平、综合实力的重要标志。大而不强、多而不优既是中国钢铁业产品结构的弊病,也是钢铁企业成长中的问题。对2002-2005年中国28家钢铁业上市公司进行的实证研究表明:第一,中国主要钢铁企业综合技术效率基本表现出一个下降的趋势;第二,东部地区钢铁企业效率最高,其次是东北地区,中部次之,西部再次之;第三,中国钢铁工业普遍存在比较严重的投入拥挤问题,集约式生产应该是未来钢铁产业的重点发展趋向;第四,中国钢铁企业的生产力改善主要是由技术进步来实现的,技术效率还有很大的改善空间。未来我国钢铁企业提高生产力的主要方向是加强创新体系建设,夯实钢铁工业发展的基础;做好企业集团战略,提高产业集中度;加快组织创新和管理创新,特别是通过建立学习型组织和有效的知识共享机制促进企业组织资本、技术资本和社会资本的创造积累和有效利用,以提高企业的经营管理能力。     

双向亚铁磁棱型自旋链的热力学性质研究

基于近些年来试验上有机和无机磁性高分子化合物的合成,文章利用双时格林函数方法, 对AB2型双向聚合物棱型自旋链的磁学和热力学性质进行了研究．在半满强耦合极限条件下,该系统可转化为量子铁磁-反铁磁自旋为1／2的AB2型海森堡模型,该模型将由零温量子相转变到亚铁磁基态．在Tyablikov耦合近似条件下,基态的自旋波、以及亚晶格的磁化强度和系统的磁化率在不同的序参量和不同外场的条件下进行了研究．结果显示该模型低温下的性质和自旋为1／2的铁磁相互作用的海森堡链相同．