
Modern Physics Letters B [SJR: 0.222] [HI: 33] [1 followers] Follow Hybrid journal (It can contain Open Access articles) ISSN (Print) 02179849  ISSN (Online) 17936640 Published by World Scientific [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: 20160921T08:28:52Z
DOI: 10.1142/S0217984916503607
 Authors: Vinod Ashokan, B. D. Indu, A. Kr. Dimri
 Effect of uniaxial strain on the electronic transport through disordered
graphene p–n junctions Authors: Min Deng, YongJian Wang, Yu Gang, JianFei Chen
Abstract: Modern Physics Letters B, Ahead of Print.
Using the nonequilibrium 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 onsite energy of the right electrode exhibits the successive steplike 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: 20160921T08:28:51Z
DOI: 10.1142/S0217984916503371
 Authors: Min Deng, YongJian Wang, Yu Gang, JianFei Chen
 Twoparty quantum key agreement protocol with fourparticle entangled
states Authors: Yefeng He, Wenping Ma
Abstract: Modern Physics Letters B, Ahead of Print.
Based on fourparticle entangled states and the delayed measurement technique, a twoparty 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 fourparticle 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: 20160921T08:28:47Z
DOI: 10.1142/S0217984916503322
 Authors: Yefeng He, Wenping Ma
 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 Xray 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 hightemperature phases and lowtemperature 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 onestep 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 flaketype 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: 20160921T08:28:46Z
DOI: 10.1142/S0217984916503280
 Authors: Yan Dong, Aimin Sun, Bin Xu, Hongtao Zhang, Meng Zhang
 Mixture of interacting supersymmetric spinless fermions and bosons in a
onedimensional 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 lowenergy excitations of the system form a twocomponent 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: 20160915T07:29:25Z
DOI: 10.1142/S0217984916300076
 Authors: P. Schlottmann
 Design and implementation of flexible TWDMPON with PtP WDM overlay
based on WSS for nextgeneration 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 pointtopoint wavelength division multiplexing (PtP WDM) overlay is proposed for the nextgeneration optical access networks in this paper. A novel softwaredefined 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 TWDMPON can provide 40 Gb/s downstream and 10 Gb/s upstream data transmission, while the PtP WDMPON can support 10 GHz pointtopoint dedicated bandwidth as the overlay complement system. The wavelengths of the TWDMPON and PtP WDMPON are allocated dynamically based on WSS, which verifies the feasibility of the proposed structure.
Citation: Modern Physics Letters B
PubDate: 20160915T07:29:24Z
DOI: 10.1142/S0217984916503243
 Authors: Bin Wu, Hongxi Yin, Jie Qin, Chang Liu, Anliang Liu, Qi Shao, Xiaoguang Xu
 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 carfollowing 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 highdensity traffic flow upstream the bottleneck and contains very complex dynamic behavior. In this paper, we analyze the effect of speed bottleneck on the spatialtemporal 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 stopandgo wave and furthermore to alleviate the traffic congestion effectively.
Citation: Modern Physics Letters B
PubDate: 20160915T07:29:24Z
DOI: 10.1142/S0217984916503231
 Authors: Kangli Zhu, Jiantao Bi, Jianjun Wu, Shubin Li
 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: 20160915T07:29:18Z
DOI: 10.1142/S0217984916503267
 Authors: Yangwei Liu, Jianuo Wu, Lipeng Lu
 Solitons, Bäcklund transformation and Lax pair for a
(2[math]+[math]1)dimensional Btype Kadomtsev–Petviashvili equation in
the fluid/plasma mechanics Authors: ZhongZhou Lan, YiTian Gao, JinWei Yang, ChuanQi Su, QiMin Wang
Abstract: Modern Physics Letters B, Ahead of Print.
Under investigation in this paper is a (2[math]+[math]1)dimensional Btype 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. Multisoliton 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: 20160913T08:48:28Z
DOI: 10.1142/S0217984916502651
 Authors: ZhongZhou Lan, YiTian Gao, JinWei Yang, ChuanQi Su, QiMin Wang
 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: 20160909T07:25:44Z
DOI: 10.1142/S0217984916501657
 Authors: A. El Kadadra, K. Fellaoui, D. Abouelaoualim, A. Oueriagli
 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: 20160909T07:25:43Z
DOI: 10.1142/S0217984916502158
 Authors: A. Asgharinejad, H. R. Askari
 Bright optical solitons or light bullets for a (3 + 1)dimensional
generalized nonlinear Schrödinger equation with the distributed
coefficients Authors: HuiMin Yin, Bo Tian, HuiLing Zhen, Jun Chai, XiaoYu 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 twosoliton 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 twosoliton 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: 20160909T07:25:42Z
DOI: 10.1142/S0217984916503061
 Authors: HuiMin Yin, Bo Tian, HuiLing Zhen, Jun Chai, XiaoYu Wu
 The effects of the overline running model of the highspeed trains on the
existing lines Authors: YongSheng Qian, JunWei Zeng, XiaoLong Zhang, JiaYuan Wang, TingTing 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 highspeed 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 highspeed 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 fouraspects is established. The results of the research in this paper could serve as the theoretical references to the newly built highspeed railways.
Citation: Modern Physics Letters B
PubDate: 20160909T07:25:40Z
DOI: 10.1142/S0217984916502092
 Authors: YongSheng Qian, JunWei Zeng, XiaoLong Zhang, JiaYuan Wang, TingTing Lv
 [math] slope comparative method for fluid and powder thermal conductivity
measurements 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 twodimensional 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 onedimensional 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 nanoSiO2 powder is accurately determined.
Citation: Modern Physics Letters B
PubDate: 20160908T07:08:49Z
DOI: 10.1142/S021798491650322X
 Authors: X. H. Zheng, L. Qiu, P. Yue, G. Wang, D. W. Tang