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Journal Cover Modern Physics Letters B
  [SJR: 0.32]   [H-I: 29]   [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]
  • Modified cubic B-spline differential quadrature method for numerical
           solution of three-dimensional coupled viscous Burger equation
    • Authors: H. S. Shukla, Mohammad Tamsir, Vineet K. Srivastava, Mohammad Mehdi Rashidi
      Abstract: Modern Physics Letters B, Volume 30, Issue 11, 30 April 2016.
      In this paper, we propose a modified cubic B-spline differential quadrature method (MCB-DQM) to solve three-dimensional (3D) coupled viscous Burger equation with appropriate initial and boundary conditions. In this method, modified cubic B-spline is treated as a basis function in the differential quadrature method (DQM) to compute the weighting coefficients. In this way, the Burger equation is reduced into a system of ordinary differential equations. An optimal strong stability-preserving Runge–Kutta (SSP-RK) method is employed to solve the resulting system of ordinary differential equations. In order to illustrate the accuracy and efficiency of the proposed method, a numerical problem is considered. From the numerical experiment, it is found that the computed result is in good agreement with the exact solution. Stability analysis of the method is also carried out using the matrix stability analysis method and found to be unconditionally stable.
      Citation: Modern Physics Letters B
      PubDate: 2016-04-29T08:29:55Z
      DOI: 10.1142/S0217984916501104
       
  • Perfect metamaterial absorbers with polarization angle
           independency in X-band waveguide
    • Authors: Cumali Sabah
      Abstract: Modern Physics Letters B, Volume 30, Issue 11, 30 April 2016.
      The design and characterization of perfect metamaterial absorbers (MAs) based on simple configurations including square- and triangle-shapes, which operate in X-band frequency region are numerically and experimentally investigated. The proposed MAs provide perfect absorption with the polarization angle independency. In X-band waveguide, the absorption rates are 99.69% and 99.97% at the resonance frequencies of 10.57 GHz and 10.93 GHz for the square- and triangle-shaped MAs, respectively. In addition, the same configurations are numerically tested under free space boundary conditions to compare and discuss the obtained results. The suggested MAs enable myriad potential application areas for security and stealth technologies in X-band including wireless communication.
      Citation: Modern Physics Letters B
      PubDate: 2016-04-29T08:29:52Z
      DOI: 10.1142/S0217984916501864
       
  • Coupling centrality and authority of co-processing model on complex
           networks
    • Authors: Zhanli Zhang, Huibin Li
      Abstract: Modern Physics Letters B, Volume 30, Issue 11, 30 April 2016.
      Coupling centrality and authority of co-processing model on complex networks are investigated in this paper. As one crucial factor to determine the processing ability of nodes, the information flow with potential time lag is modeled by co-processing diffusion which couples the continuous time processing and the discrete diffusing dynamics. Exact results on master equation and stationary state are obtained to disclose the formation. Considering the influence of a node to the global dynamical behavior, coupling centrality and authority are introduced for each node, which determine the relative importance and authority of nodes in the diffusion process. Furthermore, the experimental results on large-scale complex networks confirm our analytical prediction.
      Citation: Modern Physics Letters B
      PubDate: 2016-04-29T08:29:49Z
      DOI: 10.1142/S021798491650113X
       
  • Pulse evolution in mid-infrared femtosecond optical parametric oscillator
           based on silicon-on-insulator waveguides
    • Authors: Jin Wen
      Abstract: Modern Physics Letters B, Volume 30, Issue 11, 30 April 2016.
      The pulse evolution of mid-infrared optical parametric oscillator based on silicon-on-insulator (SOI) waveguides is numerically investigated. The properties of pulse evolution in the process of optical parametric oscillation have been described. The numerical results show that the threshold of the optical parametric oscillation cavity can be lowered due to the high nonlinearity of the waveguide. The parametric signals initiate to oscillate when the circle trip number is 5 with the appropriate length of the SOI waveguide 7 mm. Meanwhile the peak power of the output signal pulse can be reached to 400 W at the stable situation when the circle trip number is over 10 with the conversion efficiency as high as 5%. This research can supply a kind of way to generate the mid-infrared femtosecond pulse at the highly stable on-chip integration level.
      Citation: Modern Physics Letters B
      PubDate: 2016-04-29T08:29:35Z
      DOI: 10.1142/S0217984916501633
       
  • One-pot room temperature synthesizing Cu- and Mn-doped ZnSe nanocrystals
           by a rapid photochemical method
    • Authors: A. R. Bahador, M. Molaei, M. Karimipour
      Abstract: Modern Physics Letters B, Volume 30, Issue 11, 30 April 2016.
      In this work, a one-pot, rapid, green and room temperature photochemical synthesis of transition metal (TM; Cu, Mn)-doped ZnSe nanocrystals (NCs) was reported. NCs were successfully characterized using Fourier transform-infrared (FT-IR), photoluminescence (PL) and UV-Visible (UV-Vis) spectroscopy, transmission electron microscopy (TEM), X-ray diffractometry (XRD) and energy dispersive X-ray spectra (EDX). FT-IR spectra confirmed the capping of ZnSe by thioglycolic acid (TGA) molecules. XRD and TEM analysis demonstrated zinc blend phase NCs with an average size of around 3 nm. Band gap of ZnSe NCs was about 3.6 eV which it was decreased by increasing the illumination time. PL spectra of ZnSe NCs showed a broad emission with two peaks located at 380 nm and 490 nm related to excitonic and trap states emission, respectively. For ZnSe:Cu NCs, excitonic emission disappeared completely and PL intensity of trap states emission increased with the increase in the Cu[math] ion concentration so that for precursor ratio of Cu:Zn 1%, optimal value of PL intensity was obtained. For ZnSe:Mn NCs, the excitonic emission decreased gradually with the increase in the impurity concentration whereas trap state emission increased. Moreover, a peak about 590 nm was appeared from 4T1-6A1 transition of the Mn[math] impurity, demonstrating the Mn incorporation inside the ZnSe NCs structure.
      Citation: Modern Physics Letters B
      PubDate: 2016-04-29T08:29:30Z
      DOI: 10.1142/S0217984916502274
       
  • An efficient [math] threshold quantum secret sharing
           without entanglement
    • Authors: Huawang Qin, Yuewei Dai
      Abstract: Modern Physics Letters B, Ahead of Print.
      An efficient [math] threshold quantum secret sharing (QSS) scheme is proposed. In our scheme, the Hash function is used to check the eavesdropping, and no particles need to be published. So the utilization efficiency of the particles is real 100%. No entanglement is used in our scheme. The dealer uses the single particles to encode the secret information, and the participants get the secret through measuring the single particles. Compared to the existing schemes, our scheme is simpler and more efficient.
      Citation: Modern Physics Letters B
      PubDate: 2016-04-29T02:03:38Z
      DOI: 10.1142/S0217984916501384
       
  • Alcohol vapor sensing by cadmium-doped zinc oxide thick films based
           chemical sensor
    • Authors: R. A. Zargar, M. Arora, S. Chackrabarti, S. Ahmad, J. Kumar, A. K. Hafiz
      Abstract: Modern Physics Letters B, Ahead of Print.
      Cadmium-doped zinc oxide nanoparticles were derived by simple chemical co-precipitation route using zinc acetate dihydrate and cadmium acetate dihydrate as precursor materials. The thick films were casted from chemical co-precipitation route prepared nanoparticles by economic facile screen printing method. The structural, morphological, optical and electrical properties of the film were characterized relevant to alcohol vapor sensing application by powder XRD, SEM, UV-VIS and DC conductivity techniques. The response and sensitivity of alcohol (ethanol) vapor sensor are obtained from the recovery curves at optimum working temperature range from 20[math]C to 50[math]C. The result shows that maximum sensitivity of the sensor is observed at 25[math]C operating temperature. On varying alcohol vapor concentration, minor variation in resistance has been observed. The sensing mechanism of sensor has been described in terms of physical adsorption and chemical absorption of alcohol vapors on cadmium-doped zinc oxide film surface and inside film lattice network through weak hydrogen bonding, respectively.
      Citation: Modern Physics Letters B
      PubDate: 2016-04-29T02:01:19Z
      DOI: 10.1142/S0217984916502444
       
  • New solitary solutions in FPU-[math] atom chain
    • Authors: Jin-Xing Li, Shaowu Zhang, Fei Liu, Yu Gao
      Abstract: Modern Physics Letters B, Ahead of Print.
      Solitons in one-dimensional FPU-[math] lattice chains were studied by the Jacobi elliptic function expansion method under the condition of quasi-continuum approximation. It is found that there exhibits a novel nonlinear elementary excitation, i.e. exact solitary solutions. On the basis of the above, the influence of the nonlinear intensity on the solitons was analyzed. It is found that the modulation amplitude of soliton is related closely to the nonlinear parameter also.
      Citation: Modern Physics Letters B
      PubDate: 2016-04-29T02:01:17Z
      DOI: 10.1142/S0217984916501219
       
  • Effects of vanadium alloying on the microstructures and mechanical
           properties of hot-pressed tungsten material
    • Authors: Wei Guo, Kameel Arshad, Yue Yuan, Ming-Yue Zhao, Xiao-Lin Shu, Zhang-Jian Zhou, Ying Zhang, Guang-Hong Lu
      Abstract: Modern Physics Letters B, Ahead of Print.
      Tungsten and vanadium (W–V) alloys (with 1, 5 and 10 wt.% V) are fabricated by hot pressing (HP) at 1800[math]C under 20 MPa for 2 h. The effects of V content on the microstructures and mechanical properties of W–V alloy are investigated. The results indicate that with increasing V content, (i) the formation of W–V alloying phase is enhanced and the grain size of W-matrix is significantly refined; (ii) the relative density gradually increases from 92.16% to 97.72% in the case of pure W to W-10 wt.% V; (iii) the hardness rises linearly while the bending strength decreases, which is related to the enhanced alloy phase formation.
      Citation: Modern Physics Letters B
      PubDate: 2016-04-26T09:33:18Z
      DOI: 10.1142/S021798491650216X
       
  • The optimization of measurement device independent quantum key
           distribution
    • Authors: Feng Gao, Hai-Qiang Ma, Rong-Zhen Jiao
      Abstract: Modern Physics Letters B, Ahead of Print.
      Measurement device independent quantum key distribution (MDI-QKD) is a promising method for realistic quantum communication which could remove all the side-channel attacks from the imperfections of the devices. Here in this study, we theoretically analyzed the performance of the MDI-QKD system. The asymptotic case rate with the increment of the transmission distance at different polarization misalignment, background count rate and intensity is calculated respectively. The result may provide important parameters for practical application of quantum communications.
      Citation: Modern Physics Letters B
      PubDate: 2016-04-22T08:46:33Z
      DOI: 10.1142/S021798491650189X
       
  • Dynamic secondary electron emission characteristics of polymers in
           negative charging process
    • Authors: Ming Weng, Tian-Cun Hu, Na Zhang, Meng Cao
      Abstract: Modern Physics Letters B, Ahead of Print.
      We studied the dynamic secondary electron emission (SEE) characteristics of a polyimide sample in negative charging process under electron bombardment. The time evolution of secondary electron yield (SEY) has been measured with a pulsed electron gun. The dynamic SEY, as well as the surface potential have been analyzed using a capacitance model. The shift in surface potential caused by the negative charge accumulation on the sample reduces the landing energy of the primary electrons (PEs), which in turn alters the SEY. The charging process tends to be stable when the landing energy of PEs reaches the secondary crossover energy where the corresponding SEY is 1. The surface potential has an approximately negative exponential relationship with the irradiation time. The total accumulated charge at the stable state is found to be proportional to the product of the sample capacitance and the difference between initial incident energy and the secondary crossover energy. The time constant of the exponential function is proportional to the ratio of final accumulated charge to the incident current.
      Citation: Modern Physics Letters B
      PubDate: 2016-04-22T08:46:31Z
      DOI: 10.1142/S0217984916501682
       
  • A study to investigate phase transitions and nucleation kinetics of nickel
           and copper
    • Authors: F. A. Celik, A. K. Yildiz
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this study, we investigate the homogeneous nucleation kinetics of copper and nickel system during cooling process using molecular dynamics simulation (MDS). The calculation is carried out for a different number of atoms consisting of 500, 2048, 8788 and 13,500 based on embedded atom method (EAM). It is observed that the melting points for the both model increases with increasing the size of systems (i.e. the number of atoms) as expected from Parrinello and Rahman MD method. The interfacial free energies and critical nucleus radius of nickel and copper are also determined by molecular dynamics, and the results are consistent with the classical nucleation theory. The structural development and phase transformation are also determined from the radial distribution function (RDF) and local bond orientational order parameters (LBOO).
      Citation: Modern Physics Letters B
      PubDate: 2016-04-20T11:44:26Z
      DOI: 10.1142/S0217984916501293
       
  • Direct perturbation analysis on the localized waves of the modified
           
    • Authors: Min Li, Tao Xu, Lei Wang
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, the modified nonlinear Schrödinger equation is investigated via the direct perturbation method, which can describe the femtosecond optical pulse propagation in a monomodal optical fiber. Considering the quintic nonlinear perturbation, we obtain the approximate solution with the first-order correction, which can be expressed by the solution and symmetry of the derivative nonlinear Schrödinger equation. Under the nonvanishing boundary conditions, the approximate dark and anti-dark soliton solutions are derived and the existence conditions are also given. The effects of the perturbation on the propagations and interactions of the solitons on the nonzero background are discussed by comparing the physical quantities of solitons with the unperturbed case. It is found that the quintic nonlinear perturbation can lead to the change of the velocity as well as the pulse compression, but has no influence on the dynamics of the elastic interactions. Finally, numerical simulations are performed to support the theoretical results.
      Citation: Modern Physics Letters B
      PubDate: 2016-04-20T11:44:22Z
      DOI: 10.1142/S0217984916501797
       
  • Influence of Cr deficiency on sintering, thermal expansion and electrical
           properties of La[math]Sr[math]Cr[math]O[math] as a SOFC interconnect
           material
    • Authors: Yi Ren, Wen Ma, Xiaoying Li, Jun Wang, Yu Bai, Hongying Dong
      Abstract: Modern Physics Letters B, Ahead of Print.
      The SOFC interconnect materials La[math]Sr[math]Cr[math]O[math] ([math]–0.04) were prepared using an auto-ignition process. The influences of Cr deficiency on their sintering, thermal expansion and electrical properties were investigated. All the samples were pure perovskite phase after sintering at 1400[math]C for 4 h. The cell volume of La[math]Sr[math]Cr[math]O[math] decreased with increasing Cr deficient content. The relative density of the sintered bulk samples increased from 93.2% [math] to a maximum value of 94.7% [math] and then decreased to 87.7% [math]. The thermal expansion coefficients of the sintered bulk samples were in the range of 10.60–[math] (30–1000[math]C), which are compatible with that of YSZ. Among the investigated samples, the sample with 0.02 Cr deficiency had a maximum conductivity of 40.4 Scm[math] and the lowest Seebeck coefficient of 154.8 [math]VK[math] at 850[math]C in pure He. The experimental results indicate that La[math]Sr[math]Cr[math]O[math] has the best properties and is much suitable for SOFC interconnect material application.
      Citation: Modern Physics Letters B
      PubDate: 2016-04-20T11:44:18Z
      DOI: 10.1142/S021798491650127X
       
  • Influence of main-group element on half-metallic properties in
           half-Heusler compound
    • Authors: Hongyan Liu, Yushan Li, Fuyang Tian, Getian Li
      Abstract: Modern Physics Letters B, Ahead of Print.
      We investigate the band structure, magnetism and density of states of half-Heusler compounds CoCr[math] ([math] = Si, Ge, P, As) based on the first-principle calculations. Combined with molecular orbital hybridization theory, we discuss the influence of the main-group element on half-metallic properties of CoCr[math]. It is found that the replacement of Ge for Si in CoCrSi can adjust the position of the Fermi level, and while it has no impact on the energy gap width and magnetic structure. However, the substitution of P for Si can effectively adjust the magnetism without disrupting its half-metallicity. Our results demonstrate that the electronic structure of CoCr[math] is mainly dependent on the number of valence electrons of the main-group element.
      Citation: Modern Physics Letters B
      PubDate: 2016-04-13T10:05:18Z
      DOI: 10.1142/S0217984916502067
       
  • Theoretical investigations of the structural, electronic and optical
           properties of Hg[math]Cd[math]S alloys
    • Authors: S. Al-Rajoub, B. Hamad
      Abstract: Modern Physics Letters B, Ahead of Print.
      The structural, electronic and optical properties of mercury cadmium sulfide (Hg[math]Cd[math]S) alloys with [math] = 0.0, 0.25, 0.5, 0.75 are studied using density functional theory (DFT) within full-potential linearized augmented plane wave (FPLAPW) method. We used the local density approximation (LDA), the generalized gradient approximation (GGA), Hubbard-corrected functionals (GGA/LDA[math]+[math][math]) and the modified Becke–Johnson (LDA/GGA)-mjb hybrid potentials to treat the exchange-correlation functional [math]. We found that LDA functional predicts better lattice constants than GGA functional. Mercury sulfide (HgS) binary alloy was found to exhibit a semi-metallic behavior using all functional with an inverted band gap close to the experimental value. However, the hybrid functionals were more successful than LDA and GGA functionals to predict the correct electronic structure of Hg[math]Cd[math]S ternary alloys. The results of the electronic and optical band gaps are consistent for Hg[math]Cd[math]S ternary alloys.
      Citation: Modern Physics Letters B
      PubDate: 2016-04-13T08:35:18Z
      DOI: 10.1142/S0217984916501736
       
  • Emergent “quantum” theory in complex adaptive systems
    • Authors: Djordje Minic, Sinisa Pajevic
      Abstract: Modern Physics Letters B, Ahead of Print.
      Motivated by the question of stability, in this paper we argue that an effective quantum-like theory can emerge in complex adaptive systems. In the concrete example of stochastic Lotka–Volterra dynamics, the relevant effective “Planck constant” associated with such emergent “quantum” theory has the dimensions of the square of the unit of time. Such an emergent quantum-like theory has inherently nonclassical stability as well as coherent properties that are not, in principle, endangered by thermal fluctuations and therefore might be of crucial importance in complex adaptive systems.
      Citation: Modern Physics Letters B
      PubDate: 2016-03-30T07:14:50Z
      DOI: 10.1142/S0217984916502018
       
  • Direct ink writing of special-shaped structures based on TiO2 inks
    • Authors: Ya-yun Li, Long-tu Li, Bo Li
      Abstract: Modern Physics Letters B, Ahead of Print.
      Direct ink writing (DIW) method is a novel kind of ceramic fabrication approach which allows one to design and rapidly construct ceramic products in complex shapes without the need for any lithographic masks, dies or expensive moulds. A 40 wt.% water-based titanium dioxide (TiO2) suspension was formulated. With the help of DIW technique, two-dimensional (2D) spiral structures, three-dimensional (3D) woodpile structures, cylindrical structures and half conical structures at micrometer scale were fabricated. According to the rheological test, the ink shows a shear-thinning behavior and appropriate viscoelastic properties, which ensures a feasible shaping process. The scanning electron microscopy (SEM) test shows that the samples sintered at 1050[math]C for 2 h have formed ceramics completely. The DIW method has merits to pattern ceramics into special-shaped structures into two and three dimensions with high precision and good designability, which provides new ideas and methods for structural, functional and biomedical applications.
      Citation: Modern Physics Letters B
      PubDate: 2016-03-23T07:17:07Z
      DOI: 10.1142/S0217984916502122
       
  • Free electromagnetic radiation from the graphene monolayer with spatially
           modulated conductivity in THz range
    • Authors: Vladimir Gerasik, Marek S. Wartak, Alexander V. Zhukov, Mikhail B. Belonenko
      Abstract: Modern Physics Letters B, Ahead of Print.
      An infinite graphene layer is known to support graphene surface plasmon polariton (GSP) confined at the interface between the two dielectric half-spaces. In the case of finite width graphene stripe, the termination of the graphene layer acts both as a scattering source and as a “mirror”, thus producing Fabry–Perot (FP)-type resonance. These resonant wavelengths in the presence of free-standing graphene stripe are investigated using the homogeneous convolution-type integral equation approach. The capabilities of the suggested numerical method are illustrated with the results for the transmission spectrum of TM electromagnetic waves travelling in the direction perpendicular to the graphene stripe. Special attention is paid to the case of spatially modulated conductivity of the graphene monolayer, and thus the feasibility of controlling the GSP response.
      Citation: Modern Physics Letters B
      PubDate: 2016-03-08T01:11:17Z
      DOI: 10.1142/S0217984916501852
       
 
 
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