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  Subjects -> PHYSICS (Total: 798 journals)
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PHYSICS (581 journals)

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Journal Cover Modern Physics Letters B
  [SJR: 0.222]   [H-I: 33]   [9 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]
  • On urban road traffic state evaluation index system and method
    • Authors: Fei Su, Honghui Dong, Limin Jia, Xuan Sun
      Abstract: Modern Physics Letters B, Volume 31, Issue 01, 10 January 2017.
      Traffic state evaluation is a basic and critical work in the research on road traffic congestion. It can provide basic data support for the improvement measures and information release in traffic management and service. The aim of this research is to obtain a comprehensive value to describe traffic state accurately based on the evaluation index system. In this paper, it is carried out using fuzzy c-means (FCM) algorithm and fuzzy entropy weight method. In the framework, traffic flow was classified into six different states to determine the fuzzy range of indices using the improved FCM clustering analysis. Besides, fuzzy entropy weight method is proposed to compute the evaluation result of traffic state for section, road and road network, respectively. The experiments based on the traffic information in a subset of Beijing’s road network prove that the findings of traffic evaluation are in accordance with the actual situation and people’s sense of traffic state.
      Citation: Modern Physics Letters B
      PubDate: 2017-01-12T06:04:28Z
      DOI: 10.1142/S0217984916504285
       
  • Novel on-chip spiral inductors with back hollow structure
    • Authors: Gang Wang, Houfang Liu, Xiaoning Li, Haochuan Qiu, Yi Yang, Tian-Ling Ren
      Abstract: Modern Physics Letters B, Volume 31, Issue 01, 10 January 2017.
      In this work, on-chip spiral inductors with back hollow structure have been prepared on the 500 [math] thick silicon substrate with high resistivity [math]. The silicon underneath the inductor region has been completely etched by deep etching process in order to reduce the substrate eddy current losses. Several types of square spiral on-chip inductors with different metal width (w) and line spacing (s) in the case of [math] were fabricated. The experimental results are verified by FEM simulation using HFSS software. The results show that the Q-factor and self-resonance frequency of back hollow structure inductors are both enhanced compared with the conventional inductors. Furthermore, narrower width of coils for the on-chip spiral inductors with back hollow structure can result in higher Q-factor, inductance L and self-resonance frequency, which provide some important design guides for the fabrication of the high performance on-chip inductors.
      Citation: Modern Physics Letters B
      PubDate: 2017-01-12T06:04:24Z
      DOI: 10.1142/S0217984916504303
       
  • Control of an innovative super-capacitor-powered
           shape-memory-alloy actuated accumulator for blowout preventer
    • Authors: Jian Chen, Peng Li, Gangbing Song, Zhang Ren
      Abstract: Modern Physics Letters B, Volume 31, Issue 01, 10 January 2017.
      The design of a super-capacitor-powered shape-memory-alloy (SMA) actuated accumulator for blowout preventer (BOP) presented in this paper featured several advantages over conventional hydraulic accumulators including instant large current drive, quick system response and elimination of need for the pressure conduits. However, the mechanical design introduced two challenges, the nonlinear nature of SMA actuators and the varying voltage provided by a super capacitor, for control system design. A cerebellar model articulation controller (CMAC) feedforward plus PID controller was developed with the aim of compensation for these adverse effects. Experiments were conducted on a scaled down model and experimental results show that precision control can be achieved with the proposed configurations and algorithms.
      Citation: Modern Physics Letters B
      PubDate: 2017-01-12T06:04:24Z
      DOI: 10.1142/S0217984916504261
       
  • Quantum paradoxes, entanglement and their explanation on the basis of
           quantization of fields
    • Authors: A. V. Melkikh
      Abstract: Modern Physics Letters B, Ahead of Print.
      Quantum entanglement is discussed as a consequence of the quantization of fields. The inclusion of quantum fields self-consistently explains some quantum paradoxes (EPR and Hardy’s paradox). The definition of entanglement was introduced, which depends on the maximum energy of the interaction of particles. The destruction of entanglement is caused by the creation and annihilation of particles. On this basis, an algorithm for quantum particle evolution was formulated.
      Citation: Modern Physics Letters B
      PubDate: 2017-01-13T09:05:15Z
      DOI: 10.1142/S0217984917500075
       
  • Improvement of microwave magnetic properties
           by inserting nonmagnetic layer
    • Authors: Xiaoting Li, Chao An, Zhen Wang, Chunlong Xu, Gang Shi, Jinguo Wang, Zhaoyang Hou, Li Xi
      Abstract: Modern Physics Letters B, Ahead of Print.
      Co/NM (nonmagnetic Ag and SiO2)/Co sandwich structure films with different thicknesses of NM were fabricated on Si(111) substrate via oblique radio frequency sputtering. With increasing thickness of nonmagnetic Ag [math], in-plane magnetic anisotropy field [math] initially increased from 100 Oe of [math] nm to 220 Oe of [math] nm, and then decreased when [math] nm. Resonance frequency showed the same tendency with maximum 5.2 GHz when [math] nm. Damp factor increased from 0.02 for [math]–0.08 for [math] nm. The same result was observed in inserting oxide nonmagnetic SiO2 layer. This can be attributed to the competition between interface energy and exchange coupling energy.
      Citation: Modern Physics Letters B
      PubDate: 2017-01-13T09:05:15Z
      DOI: 10.1142/S021798491750004X
       
  • Effects of boron on the mechanical properties of the
           TiAl–Ti3Al alloy: A first-principles investigation
    • Authors: Zhong-Zhu Li, Ye Wei, Hong-Bo Zhou, Guang-Hong Lu
      Abstract: Modern Physics Letters B, Ahead of Print.
      Employing a first-principles method in combination with the empirical criterions, we have investigated the site preference of boron (B) and its effect on the mechanical properties of the binary-phase TiAl–Ti3Al alloy. It is found that B energetically prefers to occupy the Ti-rich octahedral interstitial site, because B is more favorable to bond with Ti in comparison with Al. The occupancy tendency of B in the TiAl–Ti3Al alloy is the TiAl/Ti3Al interface [math] Ti3Al [math] TiAl, thus B tends to segregate into the binary-phase interface in the TiAl–Ti3Al alloy. The charge density difference shows that B at the TiAl–Ti3Al interface will form strong B–Ti bonds and weak B–Al bonds, leading to the significant increasing of the cleavage energy [math] and the unstable stacking fault energy [math]. This indicates that the presence of B will strengthen the TiAl/Ti3Al interface, but block its mobility. Further, the ratio of [math]/[math] of the B-doped system is 4.63%, 8.19% lower than that of the clean system. Based on the empirical criterions, B will have a negative effect on the ductility of the TiAl–Ti3Al alloy.
      Citation: Modern Physics Letters B
      PubDate: 2017-01-13T09:05:15Z
      DOI: 10.1142/S0217984917500026
       
  • Synthesis and characterization of MnO2 nanowires
    • Authors: Mohammad Hossein Ghorbani, Abdol Mahmood Davarpanah
      Abstract: Modern Physics Letters B, Ahead of Print.
      Manganese oxides are of more interest to researchers because of their ability as catalysts and lithium batteries. In this research, MnO2 nanowires with diameter about 45 nm were synthesized by sol–gel method at room temperature (RT). Effect of increasing the annealing temperature from 400[math]C to 600[math]C on crystalline structure of nanostructure were studied and average crystallite size was estimated about 22 nm. X-ray Diffraction (XRD) method, Energy-Dispersive X-ray Diffraction (EDXD), Scanning Electron Microscopy (SEM) and Vibrating Sample Magnetometer (VSM) were used to characterize the nanowires of MnO2.
      Citation: Modern Physics Letters B
      PubDate: 2017-01-13T09:05:12Z
      DOI: 10.1142/S0217984917500063
       
  • Isotope shift calculations of Li-like neutron-rich
           and neutron-deficient Mg isotopes
    • Authors: Geng-Hua Yu, Peng-Yi Zhao, Bing-Ming Xu, Xiao-Ling Zhu, Wei Yang
      Abstract: Modern Physics Letters B, Ahead of Print.
      The isotope shifts of the [math]–[math] transitions for the Li-like neutron-rich and neutron-deficient [math] isotopes are calculated using the multi-configuration Dirac–Hartree–Fock (MCDHF) method and the relativistic configuration interaction approach. The results provided herein can be employed for the consistency check with the nuclear root-mean-square (rms) nuclear charge radii of the short-lived magnesium isotopes from the experimental isotope shifts using the corresponding transitions. The methods used here could also be applied to other few-electron Li-like systems and the analogous isotope shift results could be obtained.
      Citation: Modern Physics Letters B
      PubDate: 2017-01-13T09:05:12Z
      DOI: 10.1142/S0217984917500038
       
  • Simulation of diffuse-charge capacitance in electric double layer
           capacitors
    • Authors: Ning Sun, Dilip Gersappe
      Abstract: Modern Physics Letters B, Ahead of Print.
      We use a Lattice Boltzmann Model (LBM) in order to simulate diffuse-charge dynamics in Electric Double Layer Capacitors (EDLCs). Simulations are carried out for both the charge and the discharge processes on 2D systems of complex random electrode geometries (pure random, random spheres and random fibers). The steric effect of concentrated solutions is considered by using a Modified Poisson–Nernst–Planck (MPNP) equations and compared with regular Poisson–Nernst–Planck (PNP) systems. The effects of electrode microstructures (electrode density, electrode filler morphology, filler size, etc.) on the net charge distribution and charge/discharge time are studied in detail. The influence of applied potential during discharging process is also discussed. Our studies show how electrode morphology can be used to tailor the properties of supercapacitors.
      Citation: Modern Physics Letters B
      PubDate: 2017-01-09T09:14:00Z
      DOI: 10.1142/S0217984916504315
       
  • Spin clusters and low-energy excitations in rare earth kagome systems
    • Authors: M. J. R. Hoch
      Abstract: Modern Physics Letters B, Ahead of Print.
      The rare earth kagome systems R3Ga5SiO[math] (R = Nd or Pr), which are weakly frustrated antiferromagnets, do not exhibit long-range order at temperatures down to 40 mK as revealed by neutron scattering. The neutron experiments provide evidence for the emergence at low temperatures of correlated spins in nanoscale cluster regions with magnetic field-dependent correlation lengths. A variety of techniques have been used to determine the magnetic and thermal properties of these systems. In particular, high-field electron spin resonance (ESR), nuclear magnetic resonance (NMR) and muon spin resonance ([math]SR) experiments have established that dynamic correlation of spins remains significant at temperatures well above 1 K. ESR provides evidence for spin wave excitations in spin clusters and the spectra have been interpreted using a Heisenberg model approach. While Nd[math] (J = 9/2) is a Kramers ion Pr[math] (J = 4) is not. This difference leads to contrasts in the magnetic properties of the two systems. This review surveys the information that has been obtained on the properties of these kagome materials over the past decade.
      Citation: Modern Physics Letters B
      PubDate: 2017-01-09T09:14:00Z
      DOI: 10.1142/S0217984916300106
       
  • Plasmonic band-pass filter device using coupled asymmetric cross-shaped
           cavity
    • Authors: Xiao-Meng Geng, Si-Chen Mi, Tie-Jun Wang, Lin-Yan He, Chuan Wang
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, a novel plasmonic band-pass filter by using the system consisting four waveguides and an asymmetric cross-shaped resonator is proposed. The plasmonic system is based on the metal–insulator–metal (MIM) structure which could overcome the diffraction limit and exhibit various promising applications. Here, we investigate the transmission spectra of the cross-shaped resonator by using finite-different-time-domain (FDTD) method and we find that the peak-wavelength on different ports show redshift or blueshift behaviors which are linearly changed with the length of cavity or the coupling distance. Moreover, the wavelength filter could be achieved and further applied in optical signal integrated circuits.
      Citation: Modern Physics Letters B
      PubDate: 2017-01-09T09:13:59Z
      DOI: 10.1142/S0217984917500014
       
  • Tuning the near-gap electronic structure of Cu2O by anion–cation
           co-doping for enhanced solar energy conversion
    • Authors: Yuan Si, Hao-Ming Yang, Hong-Yu Wu, Wei-Qing Huang, Ke Yang, Ping Peng, Gui-Fang Huang
      Abstract: Modern Physics Letters B, Ahead of Print.
      Doping is an effective strategy to tune the electronic properties of semiconductors, but some side effects caused by mono-doping degrade the specific performance of matrixes. As a model system to minimize photoproduced electron-hole pairs recombination by anion–cation co-doping, we investigate the electronic structures and optical properties of (Fe[math]+[math]N) co-doped Cu2O using the first-principles calculations. Compared to the case of mono-doping, the Fe[math]N[math] (a Fe (N) atom substituting a Cu (O) atom) co-doping reduces the energy cost of doping as a consequence of the charge compensation between the iron and nitrogen impurities, which eliminates the isolated levels (induced by mono-dopant) in the band gap. Interestingly, it is found that the contributions of different host atoms (Cu and O) away from anion (N) and cation (Fe) dopants to the variation of near band gap electronic structure of the co-doped Cu2O are different. Moreover, co-doping reduces the band gap and increases the visible-light absorption of Cu2O. Both band gap reduction and low recombination rate are critical elements for efficient light-to-current conversion in co-doped semiconductor photocatalysts. These findings raise the prospect of using co-doped Cu2O with specifically engineered electronic properties in a variety of solar applications.
      Citation: Modern Physics Letters B
      PubDate: 2017-01-09T09:13:57Z
      DOI: 10.1142/S0217984916504297
       
  • The spin Hall effect of light in moving medium
    • Authors: Hehe Li, Xinzhong Li, Jingge Wang
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, we investigate the spin Hall effect of light in moving inhomogeneous medium using the Gordon metric and the Maxwell’s equations in the gravitational field. Light experiences a moving medium as a gravitational field by means of the Gordon metric. It is shown that the spin Hall effect of light is modified by the motion of medium, and the deflection of the ray trajectory is dependent on the polarization and the motion of the medium. It is interesting that there is no coupling of the spin angular momentum of light and the effective gravitational field when the medium is moving along the direction of the gradient [math]. The results provide a potential method for controlling the spin Hall effect of light in medium.
      Citation: Modern Physics Letters B
      PubDate: 2017-01-03T09:26:09Z
      DOI: 10.1142/S0217984916504273
       
  • Non-equilibrium fluctuations in the ring of material points with gravity
    • Authors: E. A. Melkikh, A. V. Melkikh, V. I. Tokmantsev
      Abstract: Modern Physics Letters B, Ahead of Print.
      As a result of numerical modeling the dependence of relative mean-square fluctuation of evaporating particles for the ring of material points interacting via gravitational forces is obtained. It is shown that this dependence is [math], where [math] = 0.39–0.6 for different virial ratios. The dependence of a fraction of evaporated particles on the width of the ring and on the ratio between the average kinetic and potential energy of the particles is obtained. The dependence of mean square deviation of fraction of evaporated particles on time was investigated. It was concluded that the concept “entropy” (as well as other thermodynamical parameters) could not be correctly introduced in the systems with gravity.
      Citation: Modern Physics Letters B
      PubDate: 2016-12-27T07:44:34Z
      DOI: 10.1142/S021798491650425X
       
  • Analytic solutions and their dynamics of atomic–molecular
           
    • Authors: Huilan Wu, Yuqin Yao
      Abstract: Modern Physics Letters B, Ahead of Print.
      The time- and space-modulated nonlinearity is the important character of the Bose–Einstein condensates (BECs). Many works have been done on atomic BECs with spatially modulated nonlinearity, but there is little work on atomic–molecular BECs. In this paper, we construct one family of explicitly exact solutions of the atomic–molecular BECs with time- and space-modulated nonlinearities and trapping potential by similarity transformations. We discuss the dynamics of matter waves including breathing solitons, quasi-breathing solitons, resonant solitons and moving solitons. We analyze the linear stability of the solutions by adding various initial stochastic noise. We also provide the experimental parameters to produce these phenomena in future experiments.
      Citation: Modern Physics Letters B
      PubDate: 2016-11-23T09:27:50Z
      DOI: 10.1142/S0217984916503723
       
 
 
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