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Journal Cover Modern Physics Letters B
  [SJR: 0.222]   [H-I: 33]   [10 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]
  • Dynamics of coherence under Markovian and non-Markovian environments
    • Authors: Zhong-Xiao Wang, Teng Ma, Shu-Hao Wang, Tie-Jun Wang, Chuan Wang
      Abstract: Modern Physics Letters B, Ahead of Print.
      The behavior of quantum coherence is studied under Markovian and non-Markovian dynamics for open quantum systems. For single qubit systems, we show that the coherence depending on the off-diagonal elements of the density matrix is the upper bound of the coherence depending on the relative entropy under both Markovian and non-Markovian processes. For two-qubit systems, in both Markovian and non-Markovian processes, quantum discord and coherence show less sensitivity to the initial state than quantum entanglement. We also find that the quantum discord has similar behaviors with coherence under both Markovian and non-Markovian dynamics.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-13T04:07:30Z
      DOI: 10.1142/S0217984917503298
       
  • Theoretical studies of the local structures and spin
           Hamiltonian parameters for Cu[math] in alkaline earth alumino borate
           glasses
    • Authors: Jia-Xing Guo, Shao-Yi Wu, Min-Quan Kuang, Li Peng, Li-Na Wu
      Abstract: Modern Physics Letters B, Ahead of Print.
      The local structures and spin Hamiltonian parameters are theoretically studied for Cu[math] in alkaline earth alumino borate (XAB, X = Mg, Ca and Sr) glasses by using the perturbation calculations for tetragonally elongated octahedral 3d9 groups. The [math] groups are subject to the large relative tetragonal elongation ratios of 15.4%, 13.4% and 13.0% for MgAB, CaAB and SrAB glasses, respectively, arising from the Jahn–Teller effect. The decreasing cubic field parameter Dq, orbital reduction factor k and relative elongation ratio with the increase of the radius of alkaline earth ion X from Mg to Ca or Sr are analyzed for the studied systems in a uniform way.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-13T04:07:30Z
      DOI: 10.1142/S0217984917503316
       
  • Indium–gallium–zinc–oxide thin-film transistor with a planar split
           dual-gate structure
    • Authors: Yu-Rong Liu, Jie Liu, Jia-Qi Song, Pui-To Lai, Ruo-He Yao
      Abstract: Modern Physics Letters B, Ahead of Print.
      An amorphous indium–gallium–zinc–oxide (a-IGZO) thin-film transistor (TFT) with a planar split dual gate (PSDG) structure has been proposed, fabricated and characterized. Experimental results indicate that the two independent gates can provide dynamical control of device characteristics such as threshold voltage, sub-threshold swing, off-state current and saturation current. The transconductance extracted from the output characteristics of the device increases from [math] to [math] for a change of control gate voltage from −2 V to 2 V, and thus the device could be used in a variable-gain amplifier. A significant advantage of the PSDG structure is its flexibility in controlling the device performance according to the need of practical applications.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-13T04:07:30Z
      DOI: 10.1142/S0217984917503328
       
  • Research on three-phase traffic flow modeling based on interaction range
    • Authors: Jun-Wei Zeng, Xu-Gang Yang, Yong-Sheng Qian, Xu-Ting Wei
      Abstract: Modern Physics Letters B, Ahead of Print.
      On the basis of the multiple velocity difference effect (MVDE) model and under short-range interaction, a new three-phase traffic flow model (S-MVDE) is proposed through careful consideration of the influence of the relationship between the speeds of the two adjacent cars on the running state of the rear car. The random slowing rule in the MVDE model is modified in order to emphasize the influence of vehicle interaction between two vehicles on the probability of vehicles’ deceleration. A single-lane model which without bottleneck structure under periodic boundary conditions is simulated, and it is proved that the traffic flow simulated by S-MVDE model will generate the synchronous flow of three-phase traffic theory. Under the open boundary, the model is expanded by adding an on-ramp, the congestion pattern caused by the bottleneck is simulated at different main road flow rates and on-ramp flow rates, which is compared with the traffic congestion pattern observed by Kerner et al. and it is found that the results are consistent with the congestion characteristics in the three-phase traffic flow theory.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-13T02:46:02Z
      DOI: 10.1142/S0217984917503286
       
  • The pressure dependence of physical properties of (W[math]Ti[math])3AlC2
           and its counterpart W3AlC2 by first-principles calculations
    • Authors: Yefei Li, Liang Sun, Jiandong Xing, Shengqiang Ma, Qiaoling Zheng, Yangzhen Liu
      Abstract: Modern Physics Letters B, Ahead of Print.
      First-principles calculations based on density functional theory (DFT) were used to investigate the mechanical properties, elastic anisotropy, electronic structure, optical properties and thermodynamic properties of a new quaternary MAX phase (W[math]Ti[math]AlC2 and its counterpart W3AlC2 under hydrostatic pressure. The results indicate that the volumetric shrinkage of (W[math]Ti[math]AlC2 is faster than that of axial shrinkage under hydrostatic pressure. The stress–strain method and Voigt–Reuss–Hill approximation were used to calculate elastic constants and moduli, respectively. These compounds are mechanically stable under hydrostatic pressure. Moreover, the moduli of (W[math]Ti[math]AlC2 and W3AlC2 increase with an increase in pressure. The anisotropic indexes and surface constructions of bulk and Young’s moduli were used to illustrate the mechanical anisotropy under hydrostatic pressure. Electronic structure and optical property of (W[math]Ti[math]AlC2 and W3AlC2 have also been discussed. The results of Debye temperature reveal that the covalent bonds among atoms in (W[math]Ti[math]AlC2 may be stronger than that of W3AlC2. The heat capacity, [math]–[math], and thermal expansion coefficient of (W[math]Ti[math]AlC2 and W3AlC2 were discussed in the ranges of 0–30 GPa and 0–2000 K using quasi-harmonic Debye model considering the phonon effects.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-13T02:46:01Z
      DOI: 10.1142/S0217984917503262
       
  • A quick method based on SIMPLISMA-KPLS for simultaneously selecting
           outlier samples and informative samples for model standardization in near
           infrared spectroscopy
    • Authors: Li-Na Li, Chang-Ming Ma, Ming Chang, Ren-Cheng Zhang
      Abstract: Modern Physics Letters B, Ahead of Print.
      A novel method based on SIMPLe-to-use Interactive Self-modeling Mixture Analysis (SIMPLISMA) and Kernel Partial Least Square (KPLS), named as SIMPLISMA-KPLS, is proposed in this paper for selection of outlier samples and informative samples simultaneously. It is a quick algorithm used to model standardization (or named as model transfer) in near infrared (NIR) spectroscopy. The NIR experiment data of the corn for analysis of the protein content is introduced to evaluate the proposed method. Piecewise direct standardization (PDS) is employed in model transfer. And the comparison of SIMPLISMA-PDS-KPLS and KS-PDS-KPLS is given in this research by discussion of the prediction accuracy of protein content and calculation speed of each algorithm. The conclusions include that SIMPLISMA-KPLS can be utilized as an alternative sample selection method for model transfer. Although it has similar accuracy to Kennard–Stone (KS), it is different from KS as it employs concentration information in selection program. This means that it ensures analyte information is involved in analysis, and the spectra (X) of the selected samples is interrelated with concentration (y). And it can be used for outlier sample elimination simultaneously by validation of calibration. According to the statistical data results of running time, it is clear that the sample selection process is more rapid when using KPLS. The quick algorithm of SIMPLISMA-KPLS is beneficial to improve the speed of online measurement using NIR spectroscopy.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-13T02:46:00Z
      DOI: 10.1142/S0217984917503274
       
  • Experimental study of spreading characteristics of droplet impacting on
           canopy fabric surface
    • Authors: Han Cheng, Chao Qiu, Changchun Zhou, Xuebin Sun, Rui Yang
      Abstract: Modern Physics Letters B, Ahead of Print.
      A new experiment based on visualization technology is designed to study the spreading characteristics of droplet impacting on canopy fabric. The processes of droplet impacting on 66 type polyamide grid silk are captured. The experimental results show that the spreading characteristics are also affected by fabric pretension and fabric permeability. The pretension is favorable for the droplet to reach the final equilibrium stage. The impact velocity determines the initial kinetic energy and plays a major role in the droplet spreading. The fabric permeability determines the wettability and has different effects on spreading characteristics under different working conditions. In addition, the above factors can enhance the two competitive processes of spreading and imbibing at the same time. The spreading characteristics depend on which process is the dominant one.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-13T02:45:59Z
      DOI: 10.1142/S0217984917503250
       
  • Electronic and optical properties of 2H-perovskite related
           tantalum/niobium oxides
    • Authors: H. Y. Yang, Q. F. Li, Z. H. Liu
      Abstract: Modern Physics Letters B, Ahead of Print.
      Quasi-one-dimensional oxides [math] (A = Ba, Sr; [math] = Na, Li and B = Ta, Nb) have been synthesized and found to display efficient photoluminescence. Their electronic and optical properties are calculated by using first-principles calculations. The modified Becke–Johnson exchange potential has been used to obtain accurate band gap. Our results reveal that alkali metal and alkaline-earth metal ions have very small contribution to the states around Fermi level, and for these compounds, the top valence bands and the conduction band bottom are dominated by O-2p and Nb/Ta-d states, respectively. All of these compounds have indirect band gap, with valence band maximum at K point and conduction band minimum at [math] point. Optical absorption spectrum is characterized by two prominent peaks. The lower energy peak originates from electron transitions between Ta/Nb-[math] and O-2p states, while the higher energy peak is determined by electron transitions between Ta/Nb-[math] and O-2p. Despite the one-dimensional feature of the lattice structure, the electronic band structure and optical properties show three-dimensional character. We find that the band gap and optical absorption threshold are considerably larger than the energy of excitation light in the luminescence measurement. This indicates the important role of the in-gap states, which may be induced by the impurity or vacancy.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-11T07:55:00Z
      DOI: 10.1142/S0217984917503237
       
  • Structural and electrical properties of Cu-doped Ni–Zn nanocrystalline
           ferrites for MLCI applications
    • Authors: D. Venkatesh, K. V. Ramesh
      Abstract: Modern Physics Letters B, Ahead of Print.
      Polycrystalline Cu substituted Ni–Zn ferrites with chemical composition Ni[math]Zn[math]-Cu[math]Fe2O4 (x = 0.00 to 0.25 in steps of 0.05) have been prepared by citrate gel autocombustion method. The samples for electrical properties have been sintered at 900[math]C for 4 h. The X-ray diffraction patterns of all samples indicate the formation of single phase spinel cubic structure. The value of lattice parameter is decreases with increasing Cu concentration. The estimated cation distribution can be derived from X-ray diffraction intensity calculations and IR spectra. The tetrahedral and octahedral bond lengths, bond angles, cation–cation and cation–anion distances were calculated by using experimental lattice parameter and oxygen positional parameters. It is observed that Cu ions are distributed in octahedral site and subsequently Ni and Fe ions in tetrahedral site. The grain size of all samples has been calculated by Scanning Electron Microscopy (SEM) images. The variations in DC electrical resistivity and dielectric constant have been explained on the basis of proposed cation distribution.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-11T07:54:56Z
      DOI: 10.1142/S0217984917503183
       
  • Dispersion relations and wave propagation in photonic hypercrystals
    • Authors: Munazza Zulfiqar Ali
      Abstract: Modern Physics Letters B, Ahead of Print.
      A photonic hypercrystal is a subwavelength periodic structure consisting of alternate layers of hyperbolic metamaterial and dielectric material. The structure can be treated as an effective medium as well as a periodic medium. Since two length scales are involved, the better treatment is to treat the hyperbolic metamaterial as an effective medium and the overall structure as a periodic medium. The dispersion relations are derived and plotted to show the appearance of propagating bands and gaps in the frequency and wave vector domains. Then using the transfer matrix approach, the transmissivity versus the frequency plot for propagating waves and grayscale plot of the transmission coefficient in the frequency versus wave vector plane for the evanescent waves are plotted and analyzed.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-11T07:54:55Z
      DOI: 10.1142/S0217984917503201
       
  • Absorption and dispersion management of near-infrared
           probe light in the carbon nanotube quantum dot nanostructure with
           spin–orbit coupling
    • Authors: Gh. Solookinejad, M. Jabbari, E. Ahmadi Sangachin, S. H. Asadpour
      Abstract: Modern Physics Letters B, Ahead of Print.
      We investigated the absorption–dispersion properties of near-infrared probe light in the carbon nanotube quantum dot (CNT-QD) nanostructure with spin–orbit (SO) coupling parameter based on quantum mechanical density matrix formalisms. We found that in the presence of SO parameter, the amplification of probe light can be achieved in the presence and lack of population inversion (lasing with and without inversion). Moreover, we realized that the normal and anomalous dispersion of probe light can occur by redacting the incoherent pumping and transverse magnetic fields.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-11T07:54:55Z
      DOI: 10.1142/S0217984917503225
       
  • A study of dynamical evolution of small two-dimensional Copper islands’
           diffusion on Ag(1[math]1[math]1) surface and observed surface effects
    • Authors: Sardar Sikandar Hayat, Zakirur-Rehman, Zulfiqar Ali Shah
      Abstract: Modern Physics Letters B, Ahead of Print.
      We study the diffusion of two-dimensional [math] islands on Ag(1[math]1[math]1) surface using molecular dynamics (MD) simulations. The work is the extension of calculations of monomer and dimer Hayat et al. [Phys. Rev. B 82 (2010) 085411] and trimer results Shah et al. [Phys. Lett. A 378 (2014) 1732]. Simulations carried out at three different temperatures — 300, 500, and 700 K — show the concerted motion to be dominant for the smaller islands (2- to 4-atoms), while the shape-changing multiple-atom processes are responsible for the diffusion of larger islands. Arrhenius plots of the diffusion coefficients reveal that the effective energy barrier is less than [math] meV for the largest island size of Cu/Ag(1[math]1[math]1). There is a scaling of the effective energy barrier with size to some extent, but most notably it remains constant for islands with 4- to 6-atoms. The diffusion coefficient increases within a factor of 10 at the three temperatures 300, 500, and 700 K. The observed anharmonic features of the [math] adislands (breakage and pop–up) at Ag(1[math]1[math]1) surface as well as the surface anharmonicity of the Ag-substrate (fissures, dislocations, vacancy generation, and atomic exchange), are also presented. These findings can serve as an input for kinetic Monte Carlo (KMC) simulations. For the smaller sized islands the variation in the effective energy barrier with the island size is in good agreement with the experimental findings.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-11T07:54:54Z
      DOI: 10.1142/S021798491750316X
       
  • Effects of W on hydrogen transport property of Nb[math]Ti[math]Ni[math]
           alloy membranes
    • Authors: Yang Yang, Dongrong Liu, Zhifei Zhu, Guohuai Liu
      Abstract: Modern Physics Letters B, Ahead of Print.
      Alloying influences of tungsten (W) into Nb[math]Ti[math]Ni[math] on the microstructure, hydrogen solubility, diffusivity, permeability and resistance to hydrogen embrittlement have been investigated. Four experimental temperatures (673, 623, 573 and 523 K) have been used. It is found that the addition of W (5 at.% and 10 at.%) reduces the hydrogen solubility. The constitution of phases is not changed with W addition, whereas volume fraction of primary bcc-niobium (Nb) phase is distinctly reduced for the content of 10 at.% W. The hydrogen permeability and diffusivity increase for Nb[math]W5Ti[math]Ni[math] only at lower temperatures such as 573 K and 523 K. Addition of 10 at.% W causes an obvious reduction in the permeability and diffusivity. The Nb[math]Ti[math]Ni[math] alloy membrane fractures at 125[math]C, while Nb[math]W5Ti[math]Ni[math] and Nb[math]W[math]Ti[math]Ni[math] alloy membranes keep intact when temperature reaches to 100[math]C. In comparison with Nb[math]Ti[math]Ni[math], the present research confirms that Nb[math]W5Ti[math]Ni[math] exhibits an enhancement in hydrogen permeability at relatively lower temperatures and an improvement in embrittlement resistance.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-11T07:54:50Z
      DOI: 10.1142/S0217984917503213
       
  • Influence of sintering technique on the characteristics of Li–Co
           nanoferrites
    • Authors: Maisnam Victory, Mamata Maisnam, Sumitra Phanjoubam
      Abstract: Modern Physics Letters B, Ahead of Print.
      Li–Co nanoferrites (Li[math]Co[math]Fe[math]O4) with x = 0.00, 0.03, 0.06, 0.09, and 0.12, were synthesized by chemical sol–gel method. Two different sintering techniques viz. conventional technique (CT) and microwave technique (MT) were employed to heat treat the synthesized samples with an aim to study the effect of sintering technique on the properties of the nanoferrites. Structural and microstructural properties of the samples were investigated using XRD and scanning electron microscopy (SEM) technique, respectively. The variation of room temperature dielectric constant and dielectric loss were measured as a function of frequency in the range 100 Hz–1 MHz and the normal dispersive behavior was observed. Magnetic properties were investigated using Vibrating Sample Magnetometer (VSM), while Soohoo’s method was used to measure Curie temperature. The results obtained have been discussed in the paper.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-11T03:02:16Z
      DOI: 10.1142/S0217984917503146
       
  • Vibrational dynamics of alpha-quartz with neutral silicon vacancies
    • Authors: A. Kislov
      Abstract: Modern Physics Letters B, Ahead of Print.
      The effects of neutrally charged silicon vacancies on the atomic structure and the lattice dynamics of [math]-quartz were studied. This theoretical study focuses on modeling of the equilibrium local structure and the symmetrized local density of vibrational states. The frequencies of localized vibrations of A- and B-symmetries induced by silicon vacancies were obtained. The contribution of atoms located around silicon vacancies in the formation of localized symmetrized vibrations was analyzed.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-11T03:02:15Z
      DOI: 10.1142/S0217984917503158
       
  • An ultra-narrowband TE-polarization absorber with a dielectric grating and
           metal substrate
    • Authors: Yan-Lin Liao, Yan Zhao, Xingfang Zhang, Wen Zhang, Zhenggen Chen
      Abstract: Modern Physics Letters B, Ahead of Print.
      We report an ultra-narrowband absorber with a dielectric grating and metal substrate. The simulation results show that we can achieve ultra-narrowband absorption with the absorption bandwidth less than 0.6 nm and the absorption rate more than 0.99 for TE-polarization (electric field is parallel to grating grooves). The simulation results also show the guide-mode resonance in the grating region and low power loss at the absorption peak. In addition, the ultra-narrowband absorption peak can be tuned by shrinking or enlarging the structure parameters. The figure of merit (FOM) is larger than 760 if this absorber is applied as a refractive index sensor.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-29T08:46:33Z
      DOI: 10.1142/S0217984917503067
       
  • The tuning effect of the electric field on the physical properties of some
           typical wurtzite semiconductors
    • Authors: Jia-Ning Li, San-Lue Hu, Hao-Yu Dong, Xiao-Ying Xu, Jia-Fu Wang, Ang Li, Qing-Guo Wang, Yan-Li Li
      Abstract: Modern Physics Letters B, Ahead of Print.
      Under the tuning of an external electric field, the variation of the geometric structures and the band gaps of the wurtzite semiconductors ZnS, ZnO, BeO, AlN, SiC and GaN have been investigated by the first-principles method based on density functional theory. The stability, density of states, band structures and the charge distribution have been analyzed under the electric field along (001) and (00[math]) directions. Furthermore, the corresponding results have been compared without the electric field. According to our calculation, we find that the magnitude and the direction of the electric field have a great influence on the electronic structures of the wurtzite materials we mentioned above, which induce a phase transition from semiconductor to metal under a certain electric field. Therefore, we can regulate their physical properties of this type of semiconductor materials by tuning the magnitude and the direction of the electric field.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-29T08:46:32Z
      DOI: 10.1142/S0217984917503109
       
  • Roles of size and kinematics in drag reduction for two tandem flexible
           foils
    • Authors: Li-Ming Chao, Dong Zhang, Guang Pan
      Abstract: Modern Physics Letters B, Ahead of Print.
      The effect of size and kinematics difference between two tandem flexible foils on drag reduction have been numerically studied. Compared with single foil, it is found that the kinematics difference between two foils would not play a significant role in reducing drag, while the size difference between two foils significantly affects the drag reduction in this two foil system. For leading foil, it always enjoys drag reduction and the highest drag reduction can be observed at bigger size difference and gap distance between two foil as 22%. For trailing foil, it suffers drag increase when the gap distance between two foils is smaller, while it enjoys drag decrease when the size difference between two foils is bigger enough. The hydrodynamic interaction between such actively undulated foils also has been uncovered and used to explain the mechanisms of drag reduction.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-29T08:46:31Z
      DOI: 10.1142/S0217984917503110
       
  • N-dark–dark solitons for the coupled higher-order nonlinear Schrödinger
           equations in optical fibers
    • Authors: Hai-Qiang Zhang, Yue Wang
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, we construct the binary Darboux transformation on the coupled higher-order dispersive nonlinear Schrödinger equations in optical fibers. We present the N-fold iterative transformation in terms of the determinants. By the limit technique, we derive the N-dark–dark soliton solutions from the non-vanishing background. Based on the obtained solutions, we find that the collision mechanisms of dark vector solitons exhibit the standard elastic collisions in both two components.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-29T08:46:27Z
      DOI: 10.1142/S0217984917503055
       
  • Dynamic calculations of the core/shell structured Ising-type endohedral
           fullerenes: The effect of core and core/shell interaction
    • Authors: Ersin Kantar
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this study, we examine by comparing the dynamic magnetic and hysteretic properties of Ising-type endohedral fullerene (EF) with various dopant magnetic particles confined within a spherical cage. The model of EF X@C[math] with X = spin-1/2, spin-1 and spin-3/2 is proposed to study the effect of the nature of core particle on the magnetic properties. The results were obtained by mean-field theory as well as Glauber-type stochastic dynamics, and focused on the response of thermal and hysteretic behaviors of systems. The system exhibits second- and first-order phase transitions. In three different core cases, the system also exhibits type-II superconductivity behavior with a dynamic hysteresis curves of the core. All results display magnetic properties of the EF which strongly depend on the nature of core particle. Moreover, core particle and core/shell (C–S) interaction are proposed as the basic factors affecting the magnetic properties of EF system.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-29T08:46:25Z
      DOI: 10.1142/S0217984917503079
       
  • Fabrication and characterization of AlN
           metal–insulator–semiconductor grown Si substrate
    • Authors: A. Mahyuddin, A. Azrina, M. Z. Mohd Yusoff, Z. Hassan
      Abstract: Modern Physics Letters B, Ahead of Print.
      An experimental investigation was conducted to explore the effect of inserting a single AlGaN interlayer between AlN epilayer and GaN/AlN heterostructures on Si (111) grown by molecular beam epitaxy (MBE). It is confirmed from the scanning electron microscopy (SEM) that the AlGaN interlayer has a remarkable effect on reducing the tensile stress and dislocation density in AlN top layer. Capacitance–voltage (C–V) measurements were conducted to study the electrical properties of AlN/GaN heterostructures. While deriving the findings through the calculation it is suggested that the AlGaN interlayer can significantly reduce the value of effective oxide charge density and total effective number of charges per unit area which are [math] and [math], respectively.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-29T08:46:25Z
      DOI: 10.1142/S0217984917503134
       
  • Structural transition of carbon nanoparticles caused by energetic
           collisions
    • Authors: Ri Cai, Jun Ye, Qingbin Wang, Guohui Chen, Junting Liu, Liangyuan Shi, Mingwei Lin, Zhuoming Xie, Jianfu Liang, Hui Huang, Jinming Liu, Mingjun Li, Cheng Liu, Hanbiao Song
      Abstract: Modern Physics Letters B, Ahead of Print.
      A broad general interest in the process of affecting the energetic deposition of flying nanoparticles has prompted a new opportunity to consider the medium-energy region in which the nanoparticles maintain their integrity and must respond to the energetic shock caused by collisions. We herein report our experimental results on the structural transition of the carbon nanoparticles induced by such energetic collisions. The beam energy was varied from 0 keV to 30 keV for a nanoparticle with over 5000 carbon atoms. Electron energy loss spectroscopy, X-ray photoemission spectroscopy, and Raman spectroscopy were carried out on the samples using a series of beam energies. These tests revealed that some graphitic sheets were formed at the higher beam energy while the sp3 ratio was unexpectedly higher for a medium beam energy.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-28T02:33:47Z
      DOI: 10.1142/S021798491750347X
       
  • Microwave characterization of nickel-based nanocomposites — High EMI
           shielding and radar absorption capability
    • Authors: Heeralal Gargama, Awalendra Kumar Thakur, Sanjay Kumar Chaturvedi
      Abstract: Modern Physics Letters B, Ahead of Print.
      This work reports, microwave characterization of nanocrystalline nickel-polyvinylidene fluoride (n-Ni/PVDF) composites with an aim to explore their electromagnetic interference (EMI) shielding and absorption properties. The composites were fabricated using compression hot molding process at an optimum level of temperature and pressure. The electrical properties of the samples are computed using the measured scattering parameters in the X-band. The wave absorption capability of a single layer absorbing structure is theoretically evaluated by employing the computed electrical parameters. Besides, the shielding effectiveness (SE) of free standing samples are also calculated using transmission line model and compared with the experimentally obtained results to validate the theoretical model. High SE (42.87 dB) and absorption (−14.37) obtained in this work, suggest futuristic applications of n-Ni/PVDF composites for EMI shielding and wave absorption.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-22T03:53:17Z
      DOI: 10.1142/S0217984917503018
       
  • Some generalized coupled nonlinear Schrödinger equations and
           conservation laws
    • Authors: Wei Liu, Xianguo Geng, Bo Xue
      Abstract: Modern Physics Letters B, Ahead of Print.
      Based on zero-curvature equation, a series of new four-component nonlinear Schrödinger-type equations related to a [math] matrix problem are proposed by using the polynomial expansion of the spectral parameter. As two special reductions, a generalized coupled nonlinear Schrödinger equation and a generalized coupled derivative nonlinear Schrödinger equation are obtained. And then, the infinite conservation laws for each of these four-component nonlinear Schrödinger-type equations are constructed with the aid of the Riccati-type equations.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-22T03:53:16Z
      DOI: 10.1142/S0217984917502992
       
  • Ultrathin Au film on polymer surface for surface plasmon polariton
           waveguide application
    • Authors: Tong Liu, Lanting Ji, Guobing He, Xiaoqiang Sun, Fei Wang, Daming Zhang
      Abstract: Modern Physics Letters B, Ahead of Print.
      Formation of laterally continuous ultrathin gold films on polymer substrates is a technological challenge. In this work, the vacuum thermal evaporation method is adopted to form continuous Au films in the thickness range of 7–17 nm on polymers of Poly(methyl-methacrylate-glycidly-methacrylate) and SU-8 film surface without using the adhesion or metallic seeding layers. Absorption spectrum, scanning electron microscope and atomic force microscope images are used to characterize the Au film thickness, roughness and optical loss. The result shows that molecular-scale structure, surface energy and electronegativity have impacts on the Au film morphology on polymers. Wet chemical etching is used to fabricate 7-nm thick Au stripes embedded in polymer claddings. These long-range surface plasmon polariton waveguides demonstrate the favorable morphological configurations and cross-sectional states. Through the end-fire excitation method, propagation losses of 6-[math] wide Au stripes are compared to theoretical values and analyzed from practical film status. The smooth, patternable gold films on polymer provide potential applications to plasmonic waveguides, biosensing, metamaterials and optical antennas.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-22T03:53:11Z
      DOI: 10.1142/S0217984917503006
       
  • Hybrid soliton solutions in the (2[math]+[math]1)-dimensional nonlinear
           Schrödinger equation
    • Authors: Meidan Chen, Biao Li
      Abstract: Modern Physics Letters B, Ahead of Print.
      Rational solutions and hybrid solutions from N-solitons are obtained by using the bilinear method and a long wave limit method. Line rogue waves and lumps in the (2[math]+[math]1)-dimensional nonlinear Schrödinger (NLS) equation are derived from two-solitons. Then from three-solitons, hybrid solutions between kink soliton with breathers, periodic line waves and lumps are derived. Interestingly, after the collision, the breathers are kept invariant, but the amplitudes of the periodic line waves and lumps change greatly. For the four-solitons, the solutions describe as breathers with breathers, line rogue waves or lumps. After the collision, breathers and lumps are kept invariant, but the line rogue wave has a great change.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-22T03:53:10Z
      DOI: 10.1142/S0217984917502980
       
  • Parametric excitation of optical phonons in weakly polar narrow band gap
           magnetized semiconductor plasmas
    • Authors: Sandeep, Sunita Dahiya, Navneet Singh
      Abstract: Modern Physics Letters B, Ahead of Print.
      An analytical treatment based on the hydrodynamic model of plasmas is developed to study parametric amplification and oscillation of optical phonon modes in weakly polar narrow direct-gap magnetized semiconductor plasmas. Second-order optical susceptibility arising due to nonlinear polarization and the basic operational characteristics of the parametric device, viz. threshold nature, power gain mechanisms and conversion efficiency, are obtained. The effects of doping, magnetic field and excitation intensity, on the above operational characteristics have been studied in detail. Numerical estimates are made for an n-InSb crystal at 5 K duly irradiated by a pulsed 10.6 [math] CO2 laser. The analysis suggests the possibility of observing super-fluorescent parametric emission and oscillation in moderately doped n-InSb crystal under off-resonant nanosecond pulsed not-too-high power laser irradiation, the crystal being immersed in a large magnetic field.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-21T03:55:26Z
      DOI: 10.1142/S0217984917502943
       
  • An approach of traffic signal control based on NLRSQP algorithm
    • Authors: Yuan-Yang Zou, Yu Hu
      Abstract: Modern Physics Letters B, Ahead of Print.
      This paper presents a linear program model with linear complementarity constraints (LPLCC) to solve traffic signal optimization problem. The objective function of the model is to obtain the minimization of total queue length with weight factors at the end of each cycle. Then, a combination algorithm based on the nonlinear least regression and sequence quadratic program (NLRSQP) is proposed, by which the local optimal solution can be obtained. Furthermore, four numerical experiments are proposed to study how to set the initial solution of the algorithm that can get a better local optimal solution more quickly. In particular, the results of numerical experiments show that: The model is effective for different arrival rates and weight factors; and the lower bound of the initial solution is, the better optimal solution can be obtained.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-21T03:55:25Z
      DOI: 10.1142/S0217984917502931
       
  • Enhancement of durability of NIR emission of Ag2S@ZnS QDs in water
    • Authors: M. Karimipour, M. Bagheri, M. Molaei
      Abstract: Modern Physics Letters B, Ahead of Print.
      Stability of Ag2S@ZnS QDs in water is a crucial concern for their application in biology. In this work, both physical sustainability and emission stability of Ag2S QDs were enhanced using parameter optimization of a pulsed microwave irradiation (MI) method up to 105 days after their preparation. UV–Vis and photoluminescence spectroscopies depicted an absorption and emission about 817 nm and 878 nm, respectively. X-ray diffraction (XRD) analysis showed a growth of Ag2S acanthite phase. Transmission Electron Microscopy (TEM) images revealed a clear formation of Ag2S@ZnS core–shell structure.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-21T03:55:25Z
      DOI: 10.1142/S0217984917502979
       
  • Acoustic response of multi-stopband local resonance plate
    • Authors: Yonggan Sun, Sheng Li, Ziquan Jiao
      Abstract: Modern Physics Letters B, Ahead of Print.
      This paper primarily investigates the effect of damping ratios on the acoustic response of a multi-stopband local resonance plate consisting of two-dimensional periodic arrays of tuned mass-spring combinations attached to a thin homogeneous plate. A Floquet–Bloch approach is employed to demonstrate the stopbands for an infinite plate. In addition, the acoustic radiation behavior and average sound radiation pressure level of finite plates are computed. A continuous and much wider stopband with good vibro-acoustic behavior can be obtained when care is taken in the design of the damping ratios of local resonance plates.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-21T03:55:24Z
      DOI: 10.1142/S0217984917502955
       
  • Sterilization by negative and positive DC plasma with a micro discharge
           gap at atmospheric pressure
    • Authors: Hua Li, Lin-Xiu Jiang, Yong-Rong Jiang, Jian-Min Zhu, Zhen-Cheng Chen
      Abstract: Modern Physics Letters B, Ahead of Print.
      A new needle-to-droplet electrode structure with a micro discharge gap (2 mm) was designed to achieve direct current (DC) discharge plasma in ambient air with the aim of using the plasma to sterilize liquids. Without using noble gases or an external air flow, we succeeded in generating both a negative and positive DC plasma at atmospheric pressure. The plasma was driven by a 0 to −20,000 V, 100 W DC power supply. A stainless steel needle with a tip diameter of [math] and a 200-[math] droplet of bacteria-containing liquid served as the electrodes. At atmospheric pressure and room temperature (23[math]C), utilizing the negative DC plasma, the discharge time lasted 10 s; the results showed that the higher the discharge voltage, the more efficient the sterilization effect. Conversely, when we applied a voltage of −5.5 kV, we found that the sterilization effect was more efficient for longer discharge times. Our findings demonstrate that Escherichia coli (E. coli) and Bacillus subtilis (B. subtilis) can be killed in about 30 s. Our experiments show that our sterilization method required less time and was more efficient for positive than for negative DC plasma under the same conditions.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-15T09:22:33Z
      DOI: 10.1142/S0217984917502967
       
  • Effect of different sound atmospheres on SnO2:Sb thin films prepared by
           dip coating technique
    • Authors: Adem Kocyigit, Erhan Ozturk, Kadir Ejderha, Guven Turgut
      Abstract: Modern Physics Letters B, Ahead of Print.
      Different sound atmosphere effects were investigated on SnO2:Sb thin films, which were deposited with dip coating technique. Two sound atmospheres were used in this study; one of them was nay sound atmosphere for soft sound, another was metallic sound for hard sound. X-ray diffraction (XRD) graphs have indicated that the films have different orientations and structural parameters in quiet room, metallic and soft sound atmospheres. It could be seen from UV–Vis spectrometer measurements that films have different band gaps and optical transmittances with changing sound atmospheres. Scanning electron microscope (SEM) and AFM images of the films have been pointed out that surfaces of films have been affected with changing sound atmospheres. The electrical measurements have shown that films have different I–V plots and different sheet resistances with changing sound atmospheres. These sound effects may be used to manage atoms in nano dimensions.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-15T09:22:32Z
      DOI: 10.1142/S0217984917502888
       
  • Non-aqueous electrochemical deposition of lead zirconate titanate films
           for flexible sensor applications
    • Authors: Sherin Joseph, A. V. Ramesh Kumar, Reji John
      Abstract: Modern Physics Letters B, Ahead of Print.
      Lead zirconate titanate (PZT) is one of the most important piezoelectric materials widely used for underwater sensors. However, PZTs are hard and non-compliant and hence there is an overwhelming attention devoted toward making it flexible by preparing films on flexible substrates by different routes. In this work, the electrochemical deposition of composition controlled PZT films over flexible stainless steel (SS) foil substrates using non-aqueous electrolyte dimethyl sulphoxide (DMSO) was carried out. Effects of various key parameters involved in electrochemical deposition process such as current density and time of deposition were studied. It was found that a current density of 25 mA/cm2 for 5 min gave a good film. The morphology and topography evaluation of the films was carried out by scanning electron microscopy (SEM) and atomic force microscopy (AFM), respectively, which showed a uniform morphology with a surface roughness of 2 nm. The PZT phase formation was studied using X-ray diffraction (XRD) and corroborated with Raman spectroscopic studies. The dielectric constant, dielectric loss, hysteresis and I–V characteristics of the film was evaluated.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-15T09:22:31Z
      DOI: 10.1142/S0217984917502876
       
  • Dielectric properties of (SWCNTs)[math] GdBa2CuO[math] superconductor
           nanocomposites
    • Authors: M. Anas, S. Ebrahim, I. G. Eldeen, R. Awad, A. I. Abou-Aly
      Abstract: Modern Physics Letters B, Ahead of Print.
      Gd-123 superconducting phase was prepared by solid-state reaction technique. Single-walled carbon nanotubes (SWCNTs) were added in Gd-123 superconducting matrix with different concentrations during the final sintering process to obtain (SWCNTs)[math] GdBa2Cu3O[math] (x = 0.0–0.1 wt.%) nanoparticles–superconductor composite. The influence of SWCNTs addition on the phase formation, structural, morphological, superconducting and dielectric properties of Gd-123 phase was investigated. It was found that SWCNTs addition enhance the phase formation and does not change the crystal structure of the host Gd-123 superconducting phase. The superconducting properties of Gd-123 samples were improved after the addition of SWCNTs up to x = 0.06 wt.% due to the enhancement in intergrain connectivity by healing up of micro-cracks and reduction of defects, while these properties were retarded with further increase in x. The dielectric response of (SWCNTs)[math] Gd-123 superconducting phase with x = 0.0, 0.01, 0.04, 0.05, 0.06 and 0.1 wt.% was measured from 100 KHz to 5 MHz at 77 K. The results reveal that for both real ([math]) and imaginary ([math]) parts of dielectric constant, the frequency of dispersion increased by increasing SWCNTs amount up to 0.06 wt.%, then this frequency shifted to lower values for x [math] 0.06 wt.%. The results were discussed according to the presence and interference of both interfacial and dipolar polarizations.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-15T09:22:31Z
      DOI: 10.1142/S0217984917502906
       
  • Temperature diagnostics of plasma under optically-thin conditions
    • Authors: Zhiqiang Zhen, Jian He
      Abstract: Modern Physics Letters B, Ahead of Print.
      For temperature diagnostics of plasma, using the silicon spectral lines emitted from the solar transition region, under the optically-thin conditions, we discuss temperature diagnostics of the quiet sun in some typical features. For the silicon IV 112.8325 nm and 140.2770 nm spectral lines, using the observed intensity ratio, we calculate the temperature of faint cell center, average cell center, average quiet sun, average network, bright network and very bright network of the quiet sun, and results are in good agreement with those predicted at the [math] ionization equilibrium temperature of formation of the silicon IV, and we discuss the temperature when the observed intensity varies from 0.05 to 0.2. This investigation will be significant for temperature diagnostics of plasma under the optically-thin conditions.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-15T09:22:30Z
      DOI: 10.1142/S021798491750292X
       
  • Graphene on Cu(111) at the nonzero temperatures: Molecular dynamic
           simulation
    • Authors: A. V. Sidorenkov, S. V. Kolesnikov, A. M. Saletsky
      Abstract: Modern Physics Letters B, Ahead of Print.
      We present results of molecular dynamic simulation of continuous graphene monolayer on Cu(111). In this paper, we investigate the dependencies of the average binding energy and the average binding distance on the temperature. The interaction between carbon and copper atoms was described by Lennard-Jones potential. It is shown that the binding energy practically remains constant in a wide range of temperatures 0–800 K. However, in the same temperature range, the binding distance of graphene on Cu(111) surface has a linear dependence on temperature. The dependence of the linear thermal expansion coefficient of the binding distance on Lennard-Jones parameters has been calculated. We suggest a simple theoretical model to explain this dependence qualitatively.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-14T08:06:11Z
      DOI: 10.1142/S021798491750289X
       
  • The gas sensing properties of hafnium oxide thin films depending on the
           annealing environment
    • Authors: Irmak Karaduman, Selim Acar
      Abstract: Modern Physics Letters B, Ahead of Print.
      The main focus of this study is to investigate the NO2 gas-sensing properties of HfO2 thin films, taking into the account the importance of the annealing environment and temperature. HfO2 films were produced with 10 nm and 20 nm thicknesses by atomic layer deposition (ALD). They were annealed under N2 and O2 environment with rapid thermal annealing system at two different temperatures. It was found that the NO2 responses of annealed in N2 environment were higher than annealed in O2 environment. The response of 10 nm thickness HfO2 thin film was calculated 22% for N2 environment whereas, it was calculated 18% for O2 environment. The highest gas response is obtained for 10 nm thickness of HfO2 thin film annealed in N2 environment. The performance of the HfO2 thin films reveals that the gas responses rely on annealing temperature as well as annealing atmosphere. The linear dependences of the sensitivity were also observed as the NO2 gas concentrations varied from 10 ppm to 30 ppm in logarithmic forms, indicating that HfO2 thin films offer promising potential for future practical applications in monitoring the NO2 gas.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-14T08:06:06Z
      DOI: 10.1142/S0217984917502840
       
  • A phase field crystal model simulation of morphology evolution and misfit
           dislocation generation in nanoheteroepitaxy
    • Authors: J. Zhang, Z. Chen, C. Cheng, Y. X. Wang
      Abstract: Modern Physics Letters B, Ahead of Print.
      A phase field crystal (PFC) model is employed to study morphology evolution of nanoheteroepitaxy and misfit dislocation generation when applied with enhanced supercooling, lattice mismatch and substrate vicinal angle conditions. Misfit strain that rises due to lattice mismatch causes rough surfaces or misfit dislocations, deteriorates film properties, hence, efforts taken to reveal their microscopic mechanism are significant for film quality improvement. Uniform islands, instead of misfit dislocations, are developed in subcritical thickness film, serving as a way of strain relief by surface mechanism. Misfit dislocations generate when strain relief by surface mechanism is deficient in higher supercooling, multilayers of misfit dislocations dominate, but the number of layers reduces gradually when the supercooling is further enhanced. Rough surfaces like islands or cuspate pits are developed which is ascribed to lattice mismatch, multilayers of misfit dislocations generate to further enhance lattice mismatch. Layers of misfit dislocations generate at a thickening position at enhanced substrate vicinal angle, this further enhancing the angle leading to sporadic generation of misfit dislocations.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-14T08:06:00Z
      DOI: 10.1142/S0217984917502839
       
  • Polymer nanocomposite dielectric and electrical properties with quantum
           dots nanofiller
    • Authors: R. M. Ahmed, R. M. M. Morsi
      Abstract: Modern Physics Letters B, Ahead of Print.
      Nanocomposite films of different contents of CdSe/ZnS quantum dots nanoparticles embedded in hosting matrix of polyvinyl chloride (PVC) were prepared by simple solution casting method. Electrical and dielectric properties of nanocomposites films were investigated in the temperature range 323–393 (K) and at frequencies (50–2000) kHz. The frequency dependence of AC conductivity was following the universal power law. The values of the frequency exponent, s, revealed that the conduction mechanism at low temperature is considered by small polaron tunneling model, whereas at high temperature, it is related to CBH model. The activation energy values [math] were depending on nanoparticle concentration as well as frequency. Also, X-ray diffraction (XRD) enabled approximately estimating the average particle size of the nanoparticles incorporated in PVC.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-12T08:23:51Z
      DOI: 10.1142/S0217984917502785
       
  • Solitary waves, rogue waves and homoclinic breather waves for a (2 +
           1)-dimensional generalized Kadomtsev–Petviashvili equation
    • Authors: Min-Jie Dong, Shou-Fu Tian, Xue-Wei Yan, Li Zou, Jin Li
      Abstract: Modern Physics Letters B, Ahead of Print.
      We study a (2 + 1)-dimensional generalized Kadomtsev–Petviashvili (gKP) equation, which characterizes the formation of patterns in liquid drops. By using Bell’s polynomials, an effective way is employed to succinctly construct the bilinear form of the gKP equation. Based on the resulting bilinear equation, we derive its solitary waves, rogue waves and homoclinic breather waves, respectively. Our results can help enrich the dynamical behavior of the KP-type equations.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-12T07:54:50Z
      DOI: 10.1142/S0217984917502815
       
  • Quality detection system and method of micro-accessory based on
           microscopic vision
    • Authors: Dongjie Li, Shiwei Wang, Yu Fu
      Abstract: Modern Physics Letters B, Ahead of Print.
      Considering that the traditional manual detection of micro-accessory has some problems, such as heavy workload, low efficiency and large artificial error, a kind of quality inspection system of micro-accessory has been designed. Micro-vision technology has been used to inspect quality, which optimizes the structure of the detection system. The stepper motor is used to drive the rotating micro-platform to transfer quarantine device and the microscopic vision system is applied to get graphic information of micro-accessory. The methods of image processing and pattern matching, the variable scale Sobel differential edge detection algorithm and the improved Zernike moments sub-pixel edge detection algorithm are combined in the system in order to achieve a more detailed and accurate edge of the defect detection. The grade at the edge of the complex signal can be achieved accurately by extracting through the proposed system, and then it can distinguish the qualified products and unqualified products with high precision recognition.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-11T07:33:34Z
      DOI: 10.1142/S0217984917502700
       
  • Design of a wide band metasurface as a linear to circular polarization
           converter
    • Authors: Olcay Altintas, Emin Unal, Oguzhan Akgol, Muharrem Karaaslan, Faruk Karadag, Cumali Sabah
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, we present a wide band metasurface (MS) polarization converter which converts a linearly polarized signal to a right-handed or left-handed circularly polarized signal both numerically and experimentally. The unit cell of MS has three nested rectangular resonators which have two metallic patches at its crossed corners. The simulated and measured results are achieved by a commercial full wave EM simulator and a vector network analyzer with two horn antennas in microwave frequency regime. The S-parameters are obtained for co-polarized and cross-polarized responses and axial ratio is evaluated by the division of these two responses. The axial ratio is kept below 3 dB for efficient polarization converting activity. Correspondingly, axial ratio bandwidth of 800 MHz is obtained. The proposed MS can easily be fabricated and integrated into many desired applications by proper configurations depending on the application area and frequencies. The proposed MS has potential such as polarization converter with 0.75 efficiency in WiMAX frequency band, PMC-like treatment with a phase reflection around 0[math] and reflection coefficient nearly unity at some frequency points. Beside this, the three nested rectangle MSs also provide opportunities to design low profile antennas with conversion characteristics.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-11T07:33:33Z
      DOI: 10.1142/S0217984917502748
       
  • Gauge transformations of the multi-component BKP and CKP hierarchies
    • Authors: Tao Song, Chuanzhong Li, Xinyue Li
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, we give the definition and multi-folds gauge transformations of the multi-component B-type Kakomtsev–Petviashvili (MBKP) hierarchy and multi-component CKP (MCKP) hierarchy. Besides, we derive new solutions after the one-fold gauge transformation of the MBKP hierarchy. The remarkable differences between the BKP (CKP) hierarchy and the MBKP (MCKP) hierarchy are given in this paper. What is more, we introduce some facts about the multi-component constrained BKP and multi-component constrained CKP hierarchies including some obstacles and some new multi-component equations.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-11T07:33:27Z
      DOI: 10.1142/S0217984917502803
       
  • Lie symmetry analysis of the deformed KdV equation
    • Authors: Yehui Huang, Wei Li, Guo Wang, Xuelin Yong
      Abstract: Modern Physics Letters B, Ahead of Print.
      The deformed KdV equation is a generalization of the classical equation that can describe the motion of the interaction between different solitary waves. In this paper, the Lie symmetry analysis is performed on the deformed KdV equation. The similarity reductions and exact solutions are obtained based on the optimal system method. The exact analytic solutions are considered by using the power series method. The conservation laws for the deformed KdV equation are presented. Finally, the analytic solutions are given and their dynamics are studied.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-11T07:33:21Z
      DOI: 10.1142/S021798491750275X
       
  • Experimental investigation on the thermal performance of Si micro-heat
           pipe with different cross-sections
    • Authors: Mohammad Hamidnia, Yi Luo, Xiaodong Wang, Congming Li
      Abstract: Modern Physics Letters B, Ahead of Print.
      Increasing component densities of the integrated circuit (IC) and packaging levels has led to thermal management problems. Si substrates with embedded micro-heat pipes (MHPs) couple good thermal characteristics and cost savings associated with IC batch processing. The thermal performance of MHP is intimately related to the cross-sectional geometry. Different cross-sections are designed in order to enhance the backflow of working fluid. In this experimental study, three different Si MHPs with same hydraulic diameter and various cross-sections are fabricated by micro-fabrication methods and tested under different conditions of fluid charge ratios. The results show that the trapezoidal MHP associated with rectangular artery which is charged with 40% of vapor chamber’s volume has the best thermal performance. This silicon-based MHP is a passive approach for thermal management, which could widen applications in the commercial electronics industry and LED lightings.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-11T07:33:20Z
      DOI: 10.1142/S0217984917502797
       
  • First-principles study on electronic properties of stanene/WS2 monolayer
    • Authors: Xi Chen, Yin Li, Jia Tang, Liyuan Wu, Dan Liang, Ru Zhang
      Abstract: Modern Physics Letters B, Ahead of Print.
      We present first-principles calculations to study the stability and electronic properties of stanene on WS2 hybrid structure. It can be seen that the stanene is bound to WS2 substrate with an interlayer distance of about 3.0 Å with a binding energy of −51.8 meV per Sn atom, suggesting a weak interaction between stanene and WS2. The nearly linear band dispersion character of stanene can be preserved with a sizeable band gap in stanene on WS2 hybrid structure due to the difference of onsite energy induced by WS2 substrate, which is more helpful to the on–off current ratio in the logical devices made of stanene/WS2. Moreover, the band gaps, the position of Dirac point with respect to Fermi level, and electron effective mass (EEM) of stanene on WS2 hybrid structure can be tuned by the interlayer distance, external electric field and strains. These results indicate that stanene on WS2 hybrid structure is a promising candidate for stanene-based field-effect transistor (FET) with a finite band gap and high carrier mobility.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-11T07:33:18Z
      DOI: 10.1142/S0217984917502712
       
  • Darboux transformation and solitons for an integrable nonautonomous
           nonlinear integro-differential Schrödinger equation
    • Authors: Xuelin Yong, Yajing Fan, Yehui Huang, Wen-Xiu Ma, Jing Tian
      Abstract: Modern Physics Letters B, Ahead of Print.
      By modifying the scheme for an isospectral problem, the non-isospectral Ablowitz–Kaup–Newell–Segur (AKNS) hierarchy is constructed via allowing the time varying spectrum. In this paper, we consider an integrable nonautonomous nonlinear integro-differential Schrödinger equation discussed before in “Multi-soliton management by the integrable nonautonomous nonlinear integro-differential Schrödinger equation” [Y. J. Zhang, D. Zhao and H. G. Luo, Ann. Phys. 350 (2014) 112]. We first analyze the integrability conditions and identify the model. Second, we modify the existing Darboux transformation (DT) for such a non-isospectral problem. Third, the nonautonomous soliton solutions are obtained via the resulting DT and basic properties of these solutions in the inhomogeneous media are discussed graphically to illustrate the influences of the variable coefficients. In the process, a technique by selecting appropriate spectral parameters instead of the variable inhomogeneities is employed to realize a different type of one-soliton management. Several novel optical solitons are constructed and their features are shown by some specific figures. In addition, four kinds of the special localized two-soliton solutions are obtained. The solitonic excitations localized both in space and time, which exhibit the feature of the so-called rogue waves but with a zero background, are discussed.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-11T07:33:12Z
      DOI: 10.1142/S0217984917502761
       
  • A new interface weak-capacitance detection ASIC of capacitive liquid level
           sensor in the rocket
    • Authors: Liang Yin, Yao Qin, Xiao-Wei Liu
      Abstract: Modern Physics Letters B, Ahead of Print.
      A new capacitive liquid level sensing interface weak-capacitance detection ASIC has been designed. This ASIC realized the detection of the output capacitance of the capacitive liquid level sensor, which converts the output capacitance of the capacitive liquid level sensor to voltage. The chip is fabricated in a standard 0.5 [math] CMOS process. The test results show that the linearity of capacitance detection of the ASIC is 0.05%, output noise is 3.7 aF/[math] (when the capacitance which will be detected is 40 pF), the stability of capacitance detection is [math] pF (1[math], 1 h), the output zero position temperature coefficient is 4.5 uV/[math]C. The test results prove that this interface ASIC can meet the requirement of high accuracy capacitance detection. Therefore, this interface ASIC can be applied in capacitive liquid level sensing and capacitive humidity sensing field.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-05T01:42:25Z
      DOI: 10.1142/S021798491750302X
       
  • Evolvement law of a macroscopic traffic model
           accounting for density-dependent relaxation time
    • Authors: Yu-Qing Wang, Xing-Jian Chu, Chao-Fan Zhou, Bin Jia, Sen Lin, Zi-Han Wu, Hua-Bing Zhu, Zi-You Gao
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, a modified macroscopic traffic flow model is presented. The term of the density-dependent relaxation time is introduced here. The relation between the relaxation time and the density in traffic flow is presented quantitatively. Besides, a factor R depicting varied properties of traffic flow in different traffic states is also introduced in the formulation of the model. Furthermore, the evolvement law of traffic flow with distinctly initial density distribution and boundary perturbations is emphasized.
      Citation: Modern Physics Letters B
      PubDate: 2017-09-05T01:42:20Z
      DOI: 10.1142/S0217984917502918
       
  • Frequency-degenerate parametric generation through IFWM effect in
           nanowaveguides
    • Authors: Mulong Liu, Leiran Wang, Qibing Sun, Weiqiang Wang, Guoxi Wang, Siqi Li, Lingxuan Zhang, Wenfu Zhang, Xiaohong Hu, Yongkang Gong, Wei Zhao
      Abstract: Modern Physics Letters B, Ahead of Print.
      We investigate highly efficient frequency-degenerate parametric generation through inverse four-wave-mixing (IFWM) in silicon nanowaveguides, which exhibits distinctly from traditional FWM phenomenon and manifests itself as a unique process producing signal and idler photon pairs with frequencies at the center of two pumps. The influences of dispersion, nonlinear coefficient and frequency detuning on the IFWM process are numerically analyzed in detail. On this basis, the optimal condition for high gain IFWM and the nanowaveguide with high nonlinearity and large normal dispersion are proposed. These results substantiate the feasibility of such frequency-degenerate parametric generation in CMOS-compatible integrated platforms, which could find important potential in signal-processing systems for photonics networks and entangled qubits generation for quantum optics.
      Citation: Modern Physics Letters B
      PubDate: 2017-08-22T08:38:33Z
      DOI: 10.1142/S0217984917502669
       
  • Can we use thermodynamics in the systems with gravity'
    • Authors: A. V. Melkikh, E. A. Melkikh
      Abstract: Modern Physics Letters B, Ahead of Print.
      It is shown that the thermodynamical parameters (temperature, pressure, entropy) as well as the concept of “thermodynamical equilibrium”, in general, cannot be introduced for systems with long-range interactions (gravity). Exceptions are dense systems (stars, planets, gas clouds), where the local equilibrium is caused by short-range forces, as well as by the creation and annihilation of photons. Local equilibrium can also be justified for cosmic microwave background radiation. It is shown that, despite the fact that the radiation of a black hole approximately corresponds to the radiation of a black body, it is impossible to introduce entropy and temperature of a black hole. Restrictions for the application of the thermodynamic parameters to the evolution of the universe as a whole are considered.
      Citation: Modern Physics Letters B
      PubDate: 2017-08-22T08:38:33Z
      DOI: 10.1142/S0217984917502724
       
  • Cascading failures in interdependent modular networks with partial random
           coupling preference
    • Authors: Meng Tian, Xianpei Wang, Zhengcheng Dong, Guowei Zhu, Jiachuang Long, Dangdang Dai, Qilin Zhang
      Abstract: Modern Physics Letters B, Ahead of Print.
      Cascading failures have been widely analyzed in interdependent networks with different coupling preferences from microscopic and macroscopic perspectives in recent years. Plenty of real-world interdependent infrastructures, representing as interdependent networks, exhibit community structure, one of the most important mesoscopic structures, and partial coupling preferences, which can affect cascading failures in interdependent networks. In this paper, we propose the partial random coupling in communities, investigating cascading failures in interdependent modular scale-free networks under inner attacks and hub attacks. We mainly analyze the effects of the discoupling probability and the intermodular connection probability on cascading failures in interdependent networks. We find that increasing either the dicoupling probability or the intermodular connection probability can enhance the network robustness under both hub attacks and inner attacks. We also note that the community structure can prevent cascading failures spreading globally in entire interdependent networks. Finally, we obtain the result that if we want to efficiently improve the robustness of interdependent networks and reduce the protection cost, the intermodular connection probability should be protected preferentially, implying that improving the robustness of a single network is the fundamental method to enhance the robustness of the entire interdependent networks.
      Citation: Modern Physics Letters B
      PubDate: 2017-08-22T08:38:32Z
      DOI: 10.1142/S0217984917502670
       
  • High-order rogue waves of the Benjamin–Ono equation and the nonlocal
           nonlinear Schrödinger equation
    • Authors: Wei Liu
      Abstract: Modern Physics Letters B, Ahead of Print.
      High-order rogue wave solutions of the Benjamin–Ono equation and the nonlocal nonlinear Schrödinger equation are derived by employing the bilinear method, which are expressed by simple polynomials. Typical dynamics of these high-order rogue waves are studied by analytical and graphical ways. For the Benjamin–Ono equation, there are two types of rogue waves, namely, bright rogue waves and dark rogue waves. In particular, the fundamental rogue wave pattern is different from the usual fundamental rogue wave patterns in other soliton equations. For the nonlocal nonlinear Schrödinger equation, the exact explicit rogue wave solutions up to the second order are presented. Typical rogue wave patterns such as Peregrine-type, triple and fundamental rogue waves are put forward. These high-order rogue wave patterns have not been shown before in the nonlocal Schrödinger equation.
      Citation: Modern Physics Letters B
      PubDate: 2017-08-22T08:38:32Z
      DOI: 10.1142/S0217984917502694
       
  • Colored correlated multiplicative and additive Gaussian colored
           noises-induced transition of a piecewise nonlinear bistable model
    • Authors: Yong-Feng Guo, Ya-Jun Shen, Bei Xi, Jian-Guo Tan
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, we investigate the steady-state properties of a piecewise nonlinear bistable model driven by multiplicative and additive Gaussian colored noises with colored cross-correlation. Using the unified colored noise approximation, we derive the analytical expression of the steady-state probability density (SPD) function. Then the effects of colored correlated Gaussian colored noises on SPD are presented. According to the research results, it is found that there appear some new nonlinear phenomena in this system. The multiplicative colored noise intensity, the additive colored noise intensity and the cross-correlation strength between noises can induce the transition. However, the transition cannot be induced by the auto-correlation time of multiplicative and additive Gaussian colored noises as well as the cross-correlation time between noises.
      Citation: Modern Physics Letters B
      PubDate: 2017-08-21T07:13:26Z
      DOI: 10.1142/S0217984917502566
       
  • Structural, electronic, vibrational and optical properties of Bi[math]
           clusters
    • Authors: Dan Liang, Wanting Shen, Chunfang Zhang, Pengfei Lu, Shumin Wang
      Abstract: Modern Physics Letters B, Ahead of Print.
      The neutral, anionic and cationic bismuth clusters with the size n up to 14 are investigated by using B3LYP functional within the regime of density functional theory and the LAN2DZ basis set. By analysis of the geometries of the Bi[math] (n = 2–14) clusters, where cationic and anionic bismuth clusters are largely similar to those of neutral ones, a periodic effect by adding units with one to four atoms into smaller cluster to form larger cluster is drawn for the stable structures of bismuth clusters. An even–odd alteration is shown for the properties of the clusters, such as the calculated binding energies and dissociation energies, as well as frontier orbital energies, electron affinities, ionization energies. All the properties indicate that the Bi4 cluster is the most possible existence in bismuth-containing materials, which supports the most recent experiment. The orbital compositions, infrared and Raman activities and the ultraviolet absorption of the most possible tetramer bismuth cluster are given in detail to reveal the periodic tendency of adding bismuth atoms and the stability of tetramer bismuth cluster.
      Citation: Modern Physics Letters B
      PubDate: 2017-08-21T07:13:26Z
      DOI: 10.1142/S0217984917502608
       
  • The thermoelectric properties of CoSb3 compound doped with Te and Sn
           synthesized at different pressure
    • Authors: Yiping Jiang, Xiaopeng Jia, Hongan Ma
      Abstract: Modern Physics Letters B, Ahead of Print.
      The skutterudite CoSb[math]Te[math]Sn[math] compound was synthesized successfully by high pressure and high temperature (HPHT) method using Co, Sb, Te and Sn powder as raw materials. The effects of pressure on its structure and the thermoelectric properties are investigated systematically from 300 K to 800 K. The electrical resistivity and the absolute value of the Seebeck coefficient for the sample increases with rising synthetic pressure. The thermal conductivity of the sample decreases with synthetic pressure and temperature rising in the range of 300–800 K. In this study, the maximum dimensionless figure of merit (ZT) value of 1.17 has been achieved at 793 K, 3 GPa for this thermoelectric material.
      Citation: Modern Physics Letters B
      PubDate: 2017-08-21T07:13:25Z
      DOI: 10.1142/S021798491750261X
       
  • Fabrication of self-enclosed nanochannels based on capillary-pressure
           balance mechanism
    • Authors: Yu Kou, Aixia Sang, Xin Li, Xudi Wang
      Abstract: Modern Physics Letters B, Ahead of Print.
      Polymer-based micro/nano fluidic devices are becoming increasingly important to biological applications and fluidic control. In this paper, we propose a self-enclosure method for the fabrication of large-area nanochannels without external force by using a capillary-pressure balance mechanism. The melt polymer coated on the nanogrooves fills into the trenches inevitably and the air in the trenches is not excluded but compressed, which leads to an equilibrium state between pressure of the trapped air and capillary force of melt polymer eventually, resulting in the channels’ formation. A pressure balance model was proposed to elucidate the unique self-sealing phenomenon and the criteria for the design and construction of sealed channels was discussed. According to the bonding mechanism investigated using the volume of fluid (VOF) simulation and experiments, we can control the dimension of sealed channels by varying the baking condition. This fabrication technique has great potential for low-cost and mass production of polymeric-based micro/nano fluidic devices.
      Citation: Modern Physics Letters B
      PubDate: 2017-08-21T07:13:23Z
      DOI: 10.1142/S0217984917502530
       
  • Corresponding state-based correlations for the temperature-dependent
           surface tension of saturated hydrocarbons
    • Authors: Jianxiang Tian, Cuihua Zhang, Laibin Zhang, Mengmeng Zheng, Shuzhen Liu
      Abstract: Modern Physics Letters B, Ahead of Print.
      Based on the recent progresses on the corresponding state-based correlations for the temperature-dependent surface tension of saturated fluids [I. Cachadiña, A. Mulero and J. X. Tian, Fluid Phase Equilibr. 442 (2017) 68; J. X. Tian, M. M. Zheng, H. L. Yi, L. B. Zhang and S. Z. Liu, Mod. Phys. Lett. B 31 (2017) 1750110], we proposed a new correlation for saturated hydrocarbons. This correlation includes three fluid-independent parameters and inquires the critical temperature, the triple-point temperature and the surface tension at the triple-point temperature as inputs for each hydrocarbon. Results show that this correlation can reproduce NIST data with absolute average deviation (AAD) less than 1% for 10 out of 19 hydrocarbons and AAD less than 5% for 17 out of 19 hydrocarbons, clearly better than other correlations.
      Citation: Modern Physics Letters B
      PubDate: 2017-08-21T07:13:23Z
      DOI: 10.1142/S0217984917502591
       
  • Average value of the shape and direction factor in the equation of
           refractive index
    • Authors: Tao Zhang
      Abstract: Modern Physics Letters B, Ahead of Print.
      The theoretical calculation of the refractive indices is of great significance for the developments of new optical materials. The calculation method of refractive index, which was deduced from the electron-cloud-conductor model, contains the shape and direction factor [math]. [math] affects the electromagnetic-induction energy absorbed by the electron clouds, thereby influencing the refractive indices. It is not yet known how to calculate [math] value of non-spherical electron clouds. In this paper, [math] value is derived by imaginatively dividing the electron cloud into numerous little volume elements and then regrouping them. This paper proves that [math] when molecules’ spatial orientations distribute randomly. The calculations of the refractive indices of several substances validate this equation. This result will help to promote the application of the calculation method of refractive index.
      Citation: Modern Physics Letters B
      PubDate: 2017-08-21T07:13:22Z
      DOI: 10.1142/S0217984917502633
       
  • The neutron irradiation effects on the temperature dependencies of the
           electrical conductivity of nanosilicon particles
    • Authors: Elchin Huseynov, Aydan Garibli
      Abstract: Modern Physics Letters B, Ahead of Print.
      The effects of temperature and neutron irradiation on the silicon nanoparticles have been studied at different frequencies. It has been defined that additional electro-active radiation defects occur in the silicon nanomaterial after neutron irradiation. Therefore, the change of neutron flux at the interval of [math]–[math] increases the conductivity of nanosilicon. Activation energies of the silicon nanoparticles were calculated for 10 different constant frequencies according to Arrhenius approach before and after neutron irradiation. The mechanism of electrical conductivity which explains results has been established.
      Citation: Modern Physics Letters B
      PubDate: 2017-08-21T07:13:20Z
      DOI: 10.1142/S0217984917502578
       
  • Comparative techniques to investigate plastically deformed 5754 Al-alloy
    • Authors: M. Abdel-Rahman, Mohammed Salah, Alaa M. Ibrahim, Emad A. Badawi
      Abstract: Modern Physics Letters B, Ahead of Print.
      Cold work (compression) is an important method that produces dislocations mainly used to improve the mechanical properties of Al-alloys. The effect of deformation on 5754 Al-alloy was investigated by Positron Annihilation Lifetime Spectroscopy (PALS), Vickers micro-hardness (HV) and X-ray diffraction (XRD) techniques. The observation of results obtained by these techniques as a function of degree of deformation showed approximately the same behavior. Mean lifetime and Vickers micro-hardness values changed from 168.0 ± 7.0 ps and 32.0 ± 1.5 Hv, respectively, for the annealed (undeformed) sample to be 214.0 ± 7.0 ps and 43.0 ± 1.5 Hv, respectively, for saturated dislocation samples. Both PALS and HV results seems to be approximately constant above 8.0% degree of deformation which is the start of the saturated dislocation region. 10% degree of deformation is considered to be a threshold point or preferred orientation point obtained from XRD measurements after which saturation of dislocation is also obtained. Due to the variation in the interatomic spacing caused by plastic deformation, a significant increase in the peak broadening and line intensities of the XRD reflections is obtained.
      Citation: Modern Physics Letters B
      PubDate: 2017-08-21T07:13:19Z
      DOI: 10.1142/S0217984917502554
       
  • The Dirac particle in the graphene dot confined within the magnetic
           barriers
    • Authors: Weixian Yan, Kaili Zuo, Lijuan Deng
      Abstract: Modern Physics Letters B, Ahead of Print.
      The analytical expressions for the eigenenergies and functions of the graphene quantum dot perpendicularly pierced by the different but parallel magnetic fields inside [math] and outside [math] dot have been derived with the ratio of the magnetic field strengths being irreducible rational [math]. It is numerically found that the curves of eigenenergies consist of the clusters bounded by a series of the two sequential different Landau levels proportional to [math] and [math], respectively. The eigenenergies depend sensitively on the magnetic quantum numbers as well as the ratio of two different magnetic fields. The counting rules for the number of the valleys within the probability density of the wave functions have been established to interpret the interrelationship between the eigenenergies and wave functions. In addition, the crowding-in effect of the wave functions due to the increase of the eigenenergies is revealed.
      Citation: Modern Physics Letters B
      PubDate: 2017-08-08T08:26:56Z
      DOI: 10.1142/S0217984917502736
       
  • Bäcklund transformation, analytic soliton solutions and numerical
           simulation for a (2[math]+[math]1)-dimensional complex Ginzburg–Landau
           equation in a nonlinear fiber
    • Authors: Ming-Xiao Yu, Bo Tian, Jun Chai, Hui-Min Yin, Zhong Du
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, we investigate a nonlinear fiber described by a (2[math]+[math]1)-dimensional complex Ginzburg–Landau equation with the chromatic dispersion, optical filtering, nonlinear and linear gain. Bäcklund transformation in the bilinear form is constructed. With the modified bilinear method, analytic soliton solutions are obtained. For the soliton, the amplitude can decrease or increase when the absolute value of the nonlinear or linear gain is enlarged, and the width can be compressed or amplified when the absolute value of the chromatic dispersion or optical filtering is enhanced. We study the stability of the numerical solutions numerically by applying the increasing amplitude, embedding the white noise and adding the Gaussian pulse to the initial values based on the analytic solutions, which shows that the numerical solutions are stable, not influenced by the finite initial perturbations.
      Citation: Modern Physics Letters B
      PubDate: 2017-08-04T04:13:15Z
      DOI: 10.1142/S021798491750258X
       
  • Investigation on the behaviors of the soliton solutions for a
           variable-coefficient generalized AB system in the geophysical flows
    • Authors: Xiao-Hang Jiang, Yi-Tian Gao, Xin-Yi Gao
      Abstract: Modern Physics Letters B, Ahead of Print.
      Under investigation in this paper is a variable-coefficient generalized AB system, which is used for modeling the baroclinic instability in the asymptotic reduction of certain classes of geophysical flows. Bilinear forms are obtained, and one-, two- and three-soliton solutions are derived via the Hirota bilinear method. Interaction and propagation of the solitons are discussed graphically. Numerical investigation on the stability of the solitons indicates that the solitons could resist the disturbance of small perturbations and propagate steadily.
      Citation: Modern Physics Letters B
      PubDate: 2017-08-04T04:13:10Z
      DOI: 10.1142/S0217984917502542
       
  • Structural study of monoclinic TiO2 nanostructures and photocatalytic
           applications for degradation of crystal violet dye
    • Authors: Muhammad T. Amin, Abdulrahman A. Alazba
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this study, titanium dioxide was synthesized by using a hydrothermal technique at different growth temperatures. The study involved investigating the effects of growth temperature on crystal structure, surface area, morphology, and photocatalytic properties. The results indicated the growth of pure monoclinic titania. Additionally, an increase in growth temperature led to the formation of nanostructures to form nanowires and nanorods from nanospheres. The findings revealed variations in crystal quality at different growth temperatures. All samples displayed monoclinic crystal structure with the same molarity at different temperatures including 140[math]C, 160[math]C, and 180[math]C. Various parameters were optimized to grow nanowires and nanorods with a monoclinic crystal structure. The planes of the grown nanostructures were same across all the samples. The grown nanostructures were applied in the degradation of a crystal violet (CV) dye that is also used in optical applications. The study involved demonstrating the excellent photodegradation properties of CV by using a synthesized nanophotocatalyst and providing a detailed discussion on the effects of morphology and crystal structure with respect to photocatalytic properties. The findings also revealed the improved photocatalytic results with respect to nanostructures due to the presence of a broad light harvesting region and the lifetime of the photogenerated electron–hole pair.
      Citation: Modern Physics Letters B
      PubDate: 2017-08-01T07:57:07Z
      DOI: 10.1142/S0217984917502645
       
  • SA-SOM algorithm for detecting communities in complex networks
    • Authors: Luogeng Chen, Yanran Wang, Xiaoming Huang, Mengyu Hu, Fang Hu
      Abstract: Modern Physics Letters B, Ahead of Print.
      Currently, community detection is a hot topic. This paper, based on the self-organizing map (SOM) algorithm, introduced the idea of self-adaptation (SA) that the number of communities can be identified automatically, a novel algorithm SA-SOM of detecting communities in complex networks is proposed. Several representative real-world networks and a set of computer-generated networks by LFR-benchmark are utilized to verify the accuracy and the efficiency of this algorithm. The experimental findings demonstrate that this algorithm can identify the communities automatically, accurately and efficiently. Furthermore, this algorithm can also acquire higher values of modularity, NMI and density than the SOM algorithm does.
      Citation: Modern Physics Letters B
      PubDate: 2017-08-01T07:57:04Z
      DOI: 10.1142/S0217984917502621
       
  • First-principles study of the electronic structure and thermoelectric
           properties of LaOBiCh2 (Ch=S, Se)
    • Authors: Guangtao Wang, Dongyang Wang, Xianbiao Shi, Yufeng Peng
      Abstract: Modern Physics Letters B, Ahead of Print.
      We studied the crystal and electronic structures of LaOBiSSe and LaOBiSeS using first-principles calculations and confirmed that the LaOBiSSe (S atoms on the top of BiCh2 layer and Se atoms in the inner of it) is the stable structure. Then we calculate the thermoelectric properties of LaOBiSSe using the standard Boltzmann transport theory. The in-plane thermoelectric performance are better than that along the c-axis in this n-type material. The in-plane power factor [math] of n-type LaOBiSSe is as high as 12 [math]W/cmK2 at 900 K with figure of merit ZT = 0.53 and [math]. The ZT maximum appears around [math] in a wide temperature region. The results indicate that LaOBiSSe is a 2D material with good thermal performance in n-type doping.
      Citation: Modern Physics Letters B
      PubDate: 2017-08-01T07:57:03Z
      DOI: 10.1142/S0217984917502657
       
 
 
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