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Journal Cover Modern Physics Letters B
  [SJR: 0.222]   [H-I: 33]   [1 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0217-9849 - ISSN (Online) 1793-6640
   Published by World Scientific Homepage  [118 journals]
  • Role of defects, resonances, anharmonicities and electron–phonon
           scattering processes on thermal conductivity of [math]
    • Authors: Vinod Ashokan, B. D. Indu, A. Kr. Dimri
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this work, thermal conductivity of high temperature superconductors (HTS) has been analyzed on the basis of modified Callaway model. In the new formulation, the relaxation times of various contributing processes have been observed in newer perspectives of electron and phonon line widths. To obtain line widths, the quantum dynamics of electron and phonon is carried out by using double time thermodynamic Green’s functions method via a general Hamiltonian. The outcome of this heuristic approach is utilized to successfully explain the spectacular behavior of thermal conductivity of HTS, and particularly in the vicinity of transition temperature.
      Citation: Modern Physics Letters B
      PubDate: 2016-09-21T08:28:52Z
      DOI: 10.1142/S0217984916503607
  • Effect of uniaxial strain on the electronic transport through disordered
           graphene p–n junctions
    • Authors: Min Deng, Yong-Jian Wang, Yu Gang, Jian-Fei Chen
      Abstract: Modern Physics Letters B, Ahead of Print.
      Using the non-equilibrium Green’s function method, we investigated theoretically the electron transport through a disordered graphene p–n junction under a perpendicular magnetic field. A uniaxial strain is applied to the graphene sheet. It is found that the conductance versus the on-site energy of the right electrode exhibits the successive step-like structure in the n–n region, however, a zero value plateau followed by the successive oscillation peaks in the p–n region. When the longitudinal or transverse strain is applied, the zero value plateau almost remains intact, while the oscillation peaks are greatly enhanced with increasing the strain strength, and depending on the orientation of the applied strain, the oscillation peaks shift towards the positive or negative energy upon increasing the strain. In the presence of the disorder, the characteristic conductance plateaus emerge at [math], [math], etc. for the appropriate disorder strength. With the rise of the strain, the original plateau structure is destroyed, instead, the conductance exhibits new plateaus whose amplitude and position strongly depend on the strain strength and direction.
      Citation: Modern Physics Letters B
      PubDate: 2016-09-21T08:28:51Z
      DOI: 10.1142/S0217984916503371
  • Two-party quantum key agreement protocol with four-particle entangled
    • Authors: Yefeng He, Wenping Ma
      Abstract: Modern Physics Letters B, Ahead of Print.
      Based on four-particle entangled states and the delayed measurement technique, a two-party quantum key agreement protocol is proposed in this paper. In the protocol, two participants can deduce the measurement results of each other’s initial quantum states in terms of the measurement correlation property of four-particle entangled states. According to the corresponding initial quantum states deduced by themselves, two parties can extract the secret keys of each other by using the publicly announced value or by performing the delayed measurement, respectively. This guarantees the fair establishment of a shared key. Since each particle in quantum channel is transmitted only once, the protocol is congenitally free from the Trojan horse attacks. The security analysis shows that the protocol not only can resist against both participant and outsider attacks but also has no information leakage problem. Moreover, it has high qubit efficiency.
      Citation: Modern Physics Letters B
      PubDate: 2016-09-21T08:28:47Z
      DOI: 10.1142/S0217984916503322
  • Effect of the BSCCO superconducting properties by tiny Y2O3 addition
    • Authors: Yan Dong, Aimin Sun, Bin Xu, Hongtao Zhang, Meng Zhang
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, the effect of tiny Y2O3 addition in (Bi,[math]Pb)-2223 superconductor prepared by solid state reaction technique was studied. The properties of samples have been investigated via X-ray diffraction (XRD), resistance–temperature ([math]–[math]) curve, scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS). XRD data indicated that all samples are multiphase and the major phases are high-temperature phases and low-temperature phases. The volume fraction of (Bi,[math]Pb)-2223 is not great change with tiny Y2O3 addition. All samples exhibit superconducting phase with the critical transition temperature and one-step transition, however, the transition width was decreased with the Y2O3 addition up to 0.04 wt.% and sharp increased with the excessive oxide addition. SEM pictures show that the Y2O3 appeared on the flake-type grains surface obviously, but the number and size of the hole between grains are decreased in the 0.04 wt.% addition.
      Citation: Modern Physics Letters B
      PubDate: 2016-09-21T08:28:46Z
      DOI: 10.1142/S0217984916503280
  • Mixture of interacting supersymmetric spinless fermions and bosons in a
           one-dimensional trap
    • Authors: P. Schlottmann
      Abstract: Modern Physics Letters B, Ahead of Print.
      We consider a gas mixture consisting of spinless fermions and bosons in one dimension interacting via a repulsive [math]-function potential. Bosons and fermions are assumed to have equal masses and the interaction strength between bosons and among bosons and fermions is the same. Using the Bethe ansatz solution of the model, we study the ground state properties, the dressed energy potentials for the two bands of rapidities, the elementary particle and hole excitations, the thermodynamics, the finite size corrections to the ground state energy leading to the conformal towers, and the asymptotic behavior at large distances of some relevant correlation functions. The low-energy excitations of the system form a two-component Luttinger liquid. In an elongated optical trap the gas phase separates as a function of the distance from the center of the trap.
      Citation: Modern Physics Letters B
      PubDate: 2016-09-15T07:29:25Z
      DOI: 10.1142/S0217984916300076
  • Design and implementation of flexible TWDM-PON with PtP WDM overlay
           based on WSS for next-generation optical access networks
    • Authors: Bin Wu, Hongxi Yin, Jie Qin, Chang Liu, Anliang Liu, Qi Shao, Xiaoguang Xu
      Abstract: Modern Physics Letters B, Ahead of Print.
      Aiming at the increasing demand of the diversification services and flexible bandwidth allocation of the future access networks, a flexible passive optical network (PON) scheme combining time and wavelength division multiplexing (TWDM) with point-to-point wavelength division multiplexing (PtP WDM) overlay is proposed for the next-generation optical access networks in this paper. A novel software-defined optical distribution network (ODN) structure is designed based on wavelength selective switches (WSS), which can implement wavelength and bandwidth dynamical allocations and suits for the bursty traffic. The experimental results reveal that the TWDM-PON can provide 40 Gb/s downstream and 10 Gb/s upstream data transmission, while the PtP WDM-PON can support 10 GHz point-to-point dedicated bandwidth as the overlay complement system. The wavelengths of the TWDM-PON and PtP WDM-PON are allocated dynamically based on WSS, which verifies the feasibility of the proposed structure.
      Citation: Modern Physics Letters B
      PubDate: 2016-09-15T07:29:24Z
      DOI: 10.1142/S0217984916503243
  • Effects of speed bottleneck on traffic flow with feedback control signal
    • Authors: Kangli Zhu, Jiantao Bi, Jianjun Wu, Shubin Li
      Abstract: Modern Physics Letters B, Ahead of Print.
      Various car-following models (CMs) have been developed to capture the complex characteristics of microscopic traffic flow, among which the coupled map CM can better reveal and reflect various phenomena of practical traffic flow. Capacity change at bottleneck contributes to high-density traffic flow upstream the bottleneck and contains very complex dynamic behavior. In this paper, we analyze the effect of speed bottleneck on the spatial-temporal evolution characteristics of traffic flow, and propose a method to reduce traffic congestion with the feedback control signal based on CM. Simulation results highlight the potential of using the feedback signal to control the stop-and-go wave and furthermore to alleviate the traffic congestion effectively.
      Citation: Modern Physics Letters B
      PubDate: 2016-09-15T07:29:24Z
      DOI: 10.1142/S0217984916503231
  • Performance of turbulence models for transonic flows in a diffuser
    • Authors: Yangwei Liu, Jianuo Wu, Lipeng Lu
      Abstract: Modern Physics Letters B, Ahead of Print.
      Eight turbulence models frequently used in aerodynamics have been employed in the detailed numerical investigations for transonic flows in the Sajben diffuser, to assess the predictive capabilities of the turbulence models for shock wave/turbulent boundary layer interactions (SWTBLI) in internal flows. The eight turbulence models include: the Spalart–Allmaras model, the standard [math] model, the RNG [math] model, the realizable [math] model, the standard [math] model, the SST [math] model, the [math] model and the Reynolds stress model. The performance of the different turbulence models adopted has been systematically assessed by comparing the numerical results with the available experimental data. The comparisons show that the predictive performance becomes worse as the shock wave becomes stronger. The [math] model and the SST [math] model perform much better than other models, and the SST [math] model predicts a little better than the [math] model for pressure on walls and velocity profile, whereas the [math] model predicts a little better than the SST [math] model for separation location, reattachment location and separation length for strong shock case.
      Citation: Modern Physics Letters B
      PubDate: 2016-09-15T07:29:18Z
      DOI: 10.1142/S0217984916503267
  • Solitons, Bäcklund transformation and Lax pair for a
           (2[math]+[math]1)-dimensional B-type Kadomtsev–Petviashvili equation in
           the fluid/plasma mechanics
    • Authors: Zhong-Zhou Lan, Yi-Tian Gao, Jin-Wei Yang, Chuan-Qi Su, Qi-Min Wang
      Abstract: Modern Physics Letters B, Ahead of Print.
      Under investigation in this paper is a (2[math]+[math]1)-dimensional B-type Kadomtsev–Petviashvili equation for the shallow water wave in a fluid or electrostatic wave potential in a plasma. Bilinear form, Bäcklund transformation and Lax pair are derived based on the binary Bell polynomials. Multi-soliton solutions are constructed via the Hirota’s method. Propagation and interaction of the solitons are illustrated graphically: (i) Through the asymptotic analysis, elastic and inelastic interactions between the two solitons are discussed analytically and graphically, respectively. The elastic interaction, amplitudes, velocities and shapes of the two solitons remain unchanged except for a phase shift. However, in the area of the inelastic interaction, amplitudes of the two solitons have a linear superposition. (ii) Elastic interactions among the three solitons indicate that the properties of the elastic interactions among the three solitons are similar to those between the two solitons. Moreover, oblique and overtaking interactions between the two solitons are displayed. Oblique interactions among the three solitons and interactions among the two parallel solitons and a single one are presented as well. (iii) Inelastic–elastic interactions imply that the interaction between the inelastic region and another one is elastic.
      Citation: Modern Physics Letters B
      PubDate: 2016-09-13T08:48:28Z
      DOI: 10.1142/S0217984916502651
  • Optical absorption coefficients in GaN/Al(Ga)N double inverse parabolic
           quantum wells under static external electric field
    • Authors: A. El Kadadra, K. Fellaoui, D. Abouelaoualim, A. Oueriagli
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this work, we have investigated theoretically the effects of applied electric field on the linear and nonlinear optical properties in a GaN/Al[math]Ga[math]N double inverse parabolic quantum well for different Al concentrations at the well center. Our calculations are based on the potential morphing method in the effective mass approximation. The systematic theoretical investigation contains results with all possible combinations of the involved parameters, such as quantum well width, quantum barrier width, Al concentration at each well center and magnitude of the external electric field. Our results show that the electric fields strengths, the parameter of nanostructure and incident optical intensity have a great effect on the optical characteristics of these nanostructures. Thus, the absorption coefficients which can be suitable for great performance optical modulators and multiple infrared optical device applications can be easily obtained by tuning the external electric field value and the Al concentration at the well center.
      Citation: Modern Physics Letters B
      PubDate: 2016-09-09T07:25:44Z
      DOI: 10.1142/S0217984916501657
  • The effect of spherical metallic nanoparticles on electromagnetically
           induced transparency in spherical quantum dots
    • Authors: A. Asgharinejad, H. R. Askari
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, electromagnetically induced transparency (EIT) is investigated in a GaAs spherical quantum dot (SQD) with central potential in presence of spherical metallic nanoparticle (SMNP). Solving the Schrödinger equation in effective mass, eigenfunctions and eigenvalues of SQD are obtained. By using the obtained eigenfunctions and eigenvalues, the susceptibility of SQD is found. In addition, dependence of EIT on radius of SQD and SMNP, distance between SMNP and SQD and Rabi and probe frequencies are investigated.
      Citation: Modern Physics Letters B
      PubDate: 2016-09-09T07:25:43Z
      DOI: 10.1142/S0217984916502158
  • Bright optical solitons or light bullets for a (3 + 1)-dimensional
           generalized nonlinear Schrödinger equation with the distributed
    • Authors: Hui-Min Yin, Bo Tian, Hui-Ling Zhen, Jun Chai, Xiao-Yu Wu
      Abstract: Modern Physics Letters B, Ahead of Print.
      Under investigation in this paper is a (3 + 1)-dimensional generalized nonlinear Schrödinger equation with the distributed coefficients for the spatiotemporal optical solitons or light bullets. Through the symbolic computation and Hirota method, one- and two-soliton solutions are derived. We also present the Bäcklund transformation, through which we derive the soliton solutions. When the gain/loss coefficient is the monotonically decreasing function for the propagation coordinate [math], amplitude for the spatiotemporal optical soliton or light bullet decreases along [math], while when the gain/loss coefficient is the monotonically increasing function for [math], amplitude for the spatiotemporal optical soliton or light bullet increases along [math]. Directions of the solitons are different because the signs of imaginary parts of the frequencies are adverse. Based on the two-soliton solutions, elastic and inelastic collisions between the two spatiotemporal optical solitons or light bullets are derived under different conditions presented in the paper.
      Citation: Modern Physics Letters B
      PubDate: 2016-09-09T07:25:42Z
      DOI: 10.1142/S0217984916503061
  • The effects of the overline running model of the high-speed trains on the
           existing lines
    • Authors: Yong-Sheng Qian, Jun-Wei Zeng, Xiao-Long Zhang, Jia-Yuan Wang, Ting-Ting Lv
      Abstract: Modern Physics Letters B, Ahead of Print.
      This paper studies the effect on the existing railway which is made by the train with 216 km/h high-speed when running across over the existing railway. The influence on the railway carrying capacity which is made by the transportation organization mode of the existing railway is analyzed under different parking modes of high-speed trains as well. In order to further study the departure intervals of the train, the average speed and the delay of the train, an automata model under these four-aspects is established. The results of the research in this paper could serve as the theoretical references to the newly built high-speed railways.
      Citation: Modern Physics Letters B
      PubDate: 2016-09-09T07:25:40Z
      DOI: 10.1142/S0217984916502092
  • [math] slope comparative method for fluid and powder thermal conductivity
    • Authors: X. H. Zheng, L. Qiu, P. Yue, G. Wang, D. W. Tang
      Abstract: Modern Physics Letters B, Ahead of Print.
      By analyzing the relationship among the heat penetration depth, measurement frequency and detector characteristic parameters, a simple and practical [math] slope comparative method has been proposed. The corresponding measurement system for measuring the thermal properties of fluids and powder materials was established and verified using several specimens with known thermophysical parameters, such as alcohol, distilled water, and air. Compared to the two-dimensional model, the data processing of the method is relatively simple and quick. Due to the elimination of errors introduced by the detector parameter measurement, the measurement accuracy of the method is higher than the conventional one-dimensional model. By using an appropriate frequency range, the new method is time saving and convenient for measuring the thermal conductivity of fluids and powders with low thermal conductivity. Based on the analysis, the effective thermal conductivity of nano-SiO2 powder is accurately determined.
      Citation: Modern Physics Letters B
      PubDate: 2016-09-08T07:08:49Z
      DOI: 10.1142/S021798491650322X
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