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  Subjects -> PHYSICS (Total: 798 journals)
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PHYSICS (579 journals)

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Journal Cover Modern Physics Letters B
  [SJR: 0.32]   [H-I: 29]   [1 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0217-9849 - ISSN (Online) 1793-6640
   Published by World Scientific Homepage  [118 journals]
  • Can fractional quantum Hall effect be due to the formation of coherent
           wave structures in a 2D electron gas?
    • Authors: Babur M. Mirza
      Abstract: Modern Physics Letters B, Volume 30, Issue 13, 20 May 2016.
      A microscopic theory of integer and fractional quantum Hall effects is presented here. In quantum density wave representation of charged particles, it is shown that, in a two-dimensional electron gas coherent structures form under the low temperature and high density conditions. With a sufficiently high applied magnetic field, the combined [math] particle quantum density wave exhibits collective periodic oscillations. As a result the corresponding quantum Hall voltage function shows a step-wise change in multiples of the ratio [math]. At lower temperatures further subdivisions emerge in the Hall resistance, exhibiting the fractional quantum Hall effect.
      Citation: Modern Physics Letters B
      PubDate: 2016-05-18T09:34:51Z
      DOI: 10.1142/S0217984916501426
       
  • Numerical analysis on thermal characteristics and ice melting efficiency
           for microwave deicing vehicle
    • Authors: Can Wang, Bo Yang, Gangfeng Tan, Xuexun Guo, Li Zhou, Shengguang Xiong
      Abstract: Modern Physics Letters B, Volume 30, Issue 13, 20 May 2016.
      In the high latitudes, the icy patches on the road are frequently generated and have a wide distribution, which are difficult to remove and obviously affect the normal usage of the highways, bridges and airport runways. Physical deicing, such as microwave (MW) deicing, help the ice melt completely through heating mode and then the ice layer can be swept away. Though it is no pollution and no damage to the ground, the low efficiency hinders the development of MW deicing vehicle equipped without sufficient speed. In this work, the standard evaluation of deicing is put forward firstly. The intensive MW deicing is simplified to ice melting process characterized by one-dimensional slab with uniform volumetric energy generation, which results in phase transformation and interface motion between ice and water. The heating process is split into the superposition of three parts — non-heterogeneous heating for ground without phase change, heat transfer with phase change and the heat convection between top surface of ice layer and flow air. Based on the transient heat conduction theory, a mathematical model, combining electromagnetic and two-phase thermal conduction, is proposed in this work, which is able to reveal the relationship between the deicing efficiency and ambient conditions, as well as energy generation and material parameters. Using finite difference time-domain, this comprehensive model is developed to solve the moving boundary heat transfer problem in a one-dimensional structured gird. As a result, the stimulation shows the longitudinal temperature distributions in all circumstances and quantitative validation is obtained by comparing simulated temperature distributions under different conditions. In view of the best economy and fast deicing, these analytic solutions referring to the complex influence factors of deicing efficiency demonstrate the optimal matching for the new deicing design.
      Citation: Modern Physics Letters B
      PubDate: 2016-05-18T09:34:09Z
      DOI: 10.1142/S0217984916502031
       
  • Fermi energy for hard-sphere gas in porous media and potential fields
    • Authors: Hai Pang, Sen Wu
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, we introduce a method for analytically calculating the Fermi energy. As an example, we study the hard-sphere (HS) gas, the gas in porous media and the gas in an external potential field or curved background. These examples are valuable for studying the spectral structure of a real gas.
      Citation: Modern Physics Letters B
      PubDate: 2016-05-20T02:24:21Z
      DOI: 10.1142/S0217984916501165
       
  • The evolution to global burst synchronization in a modular neuronal
           network
    • Authors: Xiaoli Yang, Manman Wang
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, we investigated the development of global burst synchronization in a modular neuronal network at the mesoscale level. The modular network consists of some subnetworks, each of them presenting a scale-free property. Numerical results have demonstrated that, upon increasing the coupling strength, all neurons in the modular network initially burst in a desynchronous pattern; then the burst synchronization within each subnetwork is followed at the mesoscale; finally, the global burst synchronization at the macroscale is formed by the bursting activities on each subnetwork moving forward in harmony. This implies the network behavior possesses two distinct mesoscopic and macroscopic properties for some coupling strengths, i.e. the mesoscopic dynamics of burst synchronization on subnetworks is different from the macroscopic property of desynchronous activity on the whole network. It is also found that global burst synchronization can be promoted by large interconnection probability and hindered by small interconnection probability.
      Citation: Modern Physics Letters B
      PubDate: 2016-05-19T04:07:17Z
      DOI: 10.1142/S0217984916502109
       
  • Double plasmon induced transparency in disk and nanobars coupled
           nanosystems and its application to plasmonic resonance sensing
    • Authors: Fang Chen, Duanzheng Yao
      Abstract: Modern Physics Letters B, Ahead of Print.
      We demonstrate the realization of plasmon induced transparency (PIT) in a nanostructure composed of silver nanobars and a silver nanodisk. The optical properties of the planar metamaterials have been investigated theoretically in the paper. The classical coupled harmonic oscillator model demonstrates the PIT phenomenon in a nanodisk–nanobar system. Additionally, double PIT response is observed when two nanobars are located in proximity to the silver nanodisk. The PIT window wavelength and bandwidths can be efficiently tuned by controlling the geometric parameters such as the lengths of nanobars and the coupling distances between the nanodisk and nanobars. Moreover, the transparency window shows highly sensitive response to the refractive index of the environmental medium. A high figure of merit up to 15.5 of the asymmetrical system for refractive index sensing is achieved. The tunability of the PIT may have potential application on slow light and highly integrated optical circuits.
      Citation: Modern Physics Letters B
      PubDate: 2016-05-17T07:49:36Z
      DOI: 10.1142/S0217984916501505
       
  • The ionized electron return phenomenon of Rydberg atom in crossed-fields
    • Authors: Chengwei Dong, Peijie Wang, Mengli Du, Turgay Uzer, Yueheng Lan
      Abstract: Modern Physics Letters B, Ahead of Print.
      Rydberg atom is highly excited with one valence electron being in a high quantum state, which is very far away from the nucleus. The energy level is similar to that of the hydrogen atom. Introducing externally perpendicular electric and magnetic fields breaks the rotation symmetry and the traditional view is that the ionized electron crosses from the bound into the unbound region and will never return. However, we find that when the field is strong enough, the electron does not move off to infinity and there is a certain possibility of return. Three new periodic orbits are found by the variational method and the physical significance of the phenomenon is also discussed.
      Citation: Modern Physics Letters B
      PubDate: 2016-05-13T07:29:50Z
      DOI: 10.1142/S0217984916501839
       
  • NLSE for quantum plasmas with the radiation damping
    • Authors: Pavel A. Andreev
      Abstract: Modern Physics Letters B, Ahead of Print.
      We consider contribution of the radiation damping in the quantum hydrodynamic (QHD) equations for spinless particles. We discuss possibility of obtaining corresponding nonlinear Schrödinger equation (NLSE) for the macroscopic wave function. We compare contribution of the radiation damping with weakly (or semi-) relativistic effects appearing in the second-order on [math]. The radiation damping appears in the third-order on [math]. So it might be smaller than weakly relativistic effects, but it gives damping of the Langmuir waves which can be considerable.
      Citation: Modern Physics Letters B
      PubDate: 2016-05-13T03:13:01Z
      DOI: 10.1142/S0217984916501803
       
  • From Kepler problem to skyrmions
    • Abstract: Modern Physics Letters B, Ahead of Print.
      The classical treatment of the Kepler problem leaves room for the description of the space region of the central body by a hyperbolic geometry. If the correspondence between the empty space and the space filled with matter is taken to be a harmonic mapping, then the region of atomic nucleus, like the one of the Sun for the planetary system proper, is described by hyperbolic skyrmions. This fact makes possible the description of the nuclear matter within framework of general relativity. The classical “hedgehog” solution for skyrmions can then be classically interpreted in terms of the characterizations of intra-nuclear forces.
      Citation: Modern Physics Letters B
      PubDate: 2016-05-13T03:12:57Z
      DOI: 10.1142/S0217984916501530
       
  • Generalized Darboux transformation and rogue wave solution of the
           coherently-coupled nonlinear Schrödinger system
    • Authors: Hai-Qiang Zhang, Sha-Sha Yuan, Yue Wang
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, the generalized Darboux transformation for the coherently-coupled nonlinear Schrödinger (CCNLS) system is constructed in terms of determinant representations. Based on the Nth-iterated formula, the vector bright soliton solution and vector rogue wave solution are systematically derived under the nonvanishing background. The general first-order vector rogue wave solution can admit many different fundamental patterns including eye-shaped and four-petaled rogue waves. It is believed that there are many more abundant patterns for high order vector rogue waves in CCNLS system.
      Citation: Modern Physics Letters B
      PubDate: 2016-05-13T03:12:56Z
      DOI: 10.1142/S0217984916502080
       
  • The electronic structure of graphene tuned by hexagonal boron nitrogen
           layers: Semimetal–semiconductor transition
    • Authors: Ming-Yang Liu, Qing-Yuan Chen, Tai Ma, Yao He, Chao Cao
      Abstract: Modern Physics Letters B, Ahead of Print.
      The electronic structure of graphene and hexagonal boron nitrogen (G/h-BN) systems have been carefully investigated using the pseudo-potential plane-wave within density functional theory (DFT) framework. We find that the stacking geometries and interlayer distances significantly affect the electronic structure of G/h-BN systems. By studying four stacking geometries, we conclude that the monolayer G/h-BN systems should possess metallic electronic properties. The monolayer G/h-BN systems can be transited from metallicity to semiconductor by increasing h-BN layers. It reveals that the alteration of interlayer distances 2.50–3.50 Å can obtain the metal–semiconductor–semimetal variation and a tunable band gap for G/h-BN composite systems. The band dispersion along [math]–[math] direction is analogous to the band of rhombohedral graphite when the G/h-BN systems are semiconducting.
      Citation: Modern Physics Letters B
      PubDate: 2016-05-13T03:12:52Z
      DOI: 10.1142/S0217984916501918
       
  • Statistical significance across multiple optimization models for community
           partition
    • Authors: Ju Li, Hui-Jia Li, He-Jin Mao, Junhua Chen
      Abstract: Modern Physics Letters B, Ahead of Print.
      The study of community structure is an important problem in a wide range of applications, which can help us understand the real network system deeply. However, due to the existence of random factors and error edges in real networks, how to measure the significance of community structure efficiently is a crucial question. In this paper, we present a novel statistical framework computing the significance of community structure across multiple optimization methods. Different from the universal approaches, we calculate the similarity between a given node and its leader and employ the distribution of link tightness to derive the significance score, instead of a direct comparison to a randomized model. Based on the distribution of community tightness, a new “[math]-value” form significance measure is proposed for community structure analysis. Specially, the well-known approaches and their corresponding quality functions are unified to a novel general formulation, which facilitates in providing a detailed comparison across them. To determine the position of leaders and their corresponding followers, an efficient algorithm is proposed based on the spectral theory. Finally, we apply the significance analysis to some famous benchmark networks and the good performance verified the effectiveness and efficiency of our framework.
      Citation: Modern Physics Letters B
      PubDate: 2016-05-13T03:12:51Z
      DOI: 10.1142/S0217984916501876
       
  • Citrate complexing sol–gel process of lead-free (K,[math]Na)NbO3
           ferroelectric films
    • Authors: Linlin Yao, Kongjun Zhu
      Abstract: Modern Physics Letters B, Ahead of Print.
      The citrate complexing sol–gel process to fabricate lead-free (K,[math]Na)NbO3 ferroelectric thin films was studied. Soluble niobium source of niobium–citric acid (Nb–CA) solution was utilized as a raw material to synthesize (K,[math]Na)NbO3 thin films, by pyrolyzing at 450–550[math]C and annealing at 650[math]C. The film pyrolyzed at 450[math]C shows poor crystallization with porous morphology, whereas the film pyrolyzed at 550[math]C appear to be well-crystallized and denser, and the ferroelectricity was also proved by the [math]–[math] hysteresis loop measurement.
      Citation: Modern Physics Letters B
      PubDate: 2016-05-11T06:43:48Z
      DOI: 10.1142/S0217984916501578
       
  • Thermoluminescence curves simulation using genetic
           algorithm with factorial design
    • Authors: E. A. Popko, I. A. Weinstein
      Abstract: Modern Physics Letters B, Ahead of Print.
      The evolutionary approach is an effective optimization tool for numeric analysis of thermoluminescence (TL) processes to assess the microparameters of kinetic models and to determine its effects on the shape of TL peaks. In this paper, the procedure for tuning of genetic algorithm (GA) is presented. This approach is based on multifactorial experiment and allows choosing intrinsic mechanisms of evolutionary operators which provide the most efficient algorithm performance. The proposed method is tested by considering the “one trap–one recombination center” (OTOR) model as an example and advantages for approximation of experimental TL curves are shown.
      Citation: Modern Physics Letters B
      PubDate: 2016-05-11T06:43:45Z
      DOI: 10.1142/S021798491650144X
       
 
 
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