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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]
  • Dynamical analysis of memristor-based fractional-order neural networks
           with time delay
    • Authors: Xueli Cui, Yongguang Yu, Hu Wang, Wei Hu
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, the memristor-based fractional-order neural networks with time delay are analyzed. Based on the theories of set-value maps, differential inclusions and Filippov’s solution, some sufficient conditions for asymptotic stability of this neural network model are obtained when the external inputs are constants. Besides, uniform stability condition is derived when the external inputs are time-varying, and its attractive interval is estimated. Finally, numerical examples are given to verify our results.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-27T04:12:47Z
      DOI: 10.1142/S0217984916502717
       
  • Effects of reduction temperature on copper nanowires growth by thermal
           reduction of copper oxide nanowires
    • Authors: Norhana Mohamed Rashid, Naoki Kishi, Tetsuo Soga
      Abstract: Modern Physics Letters B, Ahead of Print.
      Metallic Cu nanowires have been synthesized by thermal reduction of CuO nanowires in low concentration hydrogen environment. The Cu nanowires can be formed after removing oxide group from the metal oxide nanowires within temperature range from 200[math]C to 500[math]C. These nanowires have twisted structure with 100–200 nm and average lengths of 10 [math]m can be obtained in optimum temperature range 300–400[math]C reduced for 30 min. The X-ray diffraction (XRD) pattern shows Cu peaks recognized at (111), (200) and (220). Scanning electron microscopy (SEM) images reveal the reduction temperatures strongly affect the nanowires formation. Transmission electron microscopy (TEM) images confirmed that Cu nanowires have single crystalline structures with 0.21 nm fringe spacing which correspond to (111) growth direction. The results indicate that thermal reduction of copper oxide nanowires in low concentration hydrogen environment can produce high purity and single crystalline Cu nanowires.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-27T04:12:46Z
      DOI: 10.1142/S0217984916501931
       
  • Optical and structural characterization of quadruplet and quintuplet
           molybdenum-containing phosphate glasses
    • Authors: Ehsan Soheyli, Mohammad Hossein Hekmatshoar, Farshad Parcham
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this work, vitreous samples were prepared in two series by normal melt-quenching technique and under controlled conditions. The amorphous nature of specimens was confirmed using XRD spectra. To perform FT-IR and UV-vis studies, the thin blown films were also prepared. Different ratios of transition metals are assumed to cause depolymerization of the phosphate glass network. Infrared spectra showed absorption bands related to characteristic bonds of phosphate. The P=O bond at about 1200 cm[math] was observed, as a direct consequence of meta-phosphate bond group. The almost unchanged peak position and intensity of P=O bond (in the presence of two transition metal ions) indicated the glass modifying nature of transition metal oxides (TMOs). The spectra of two series are almost identical, except for 890–1100 cm[math] range, which can be attributed to presence of second TMO in the first glass series. UV-vis spectra also showed that the absorption edge, optical band gap and Urbach energy of the prepared samples are highly dependent on the kind and percentage of their reagents. The most striking result of UV-vis measurements was increasing and decreasing of optical band gap in the first and the second series with MoO3 content, respectively. The shape of the absorption edge (a plot of [math] versus [math]) demonstrated the indirect nature of the band gap in the prepared specimens.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-27T04:12:45Z
      DOI: 10.1142/S0217984916502705
       
  • Large-scale synthesis of WSe2 atomic layers on SiO2/Si
    • Authors: Hui-Wen Cao, Hai-Ming Zhao, Xin Xin, Peng-Zhi Shao, Han-Yu Qi, Mu-Qiang Jian, Ying-Ying Zhang, Yi Yang, Tian-Ling Ren
      Abstract: Modern Physics Letters B, Ahead of Print.
      We report a systematic study of large-scale growth of high-quality WSe2 atomic layers directly on SiO2/Si substrates using a convenient method. Various parameters, especially growth temperatures, flow rate of carrier gas and tube pressure, are investigated in affecting the properties of as-grown WSe2 flakes in terms of their sizes, shapes and thickness. The pre-annealing step is demonstrated to be a key role in achieving the large-scale growth. Under an optimized condition, the lateral size of triangular single-crystal monolayer WSe2 is up to 30 [math]m and the area of the monolayer thin film can be up to 0.25 mm2. And some other interesting features, such as nanoflowers, are observed, which are a promising for catalyzing research. Raman spectrum and microphotoluminescence indicate distinct layer dependent efficiency. Auger electron spectroscopy (AES) studies demonstrate the atomic concentration of the as-grown WSe2. Electrical transport further shows that the [math]-type WSe2 field-effect transistors exhibit excellent electrical properties with carrier mobility of [math][math]64 cm[math]V[math]s[math] and current on/off ratio over 105. These results are comparable to the exfoliated materials.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-27T04:12:43Z
      DOI: 10.1142/S0217984916502675
       
  • Frequency dependence and fuel effect on optical properties
           of nano TiO2-based structures
    • Authors: Mahdi Ghasemifard, Misagh Ghamari, Meysam Iziy
      Abstract: Modern Physics Letters B, Ahead of Print.
      TiO2-(Ti[math]Si[math]O2 nanopowders (TS-NPs) with average particle size around 90 nm were successfully synthesized by controlled auto-combustion method by using citric acid/nitric acid (AC:NA) and urea/metal cation (U:MC). The structure of powders was studied based on their X-ray diffraction (XRD) patterns. The XRD of TS-NPs shows that rutile and anatase are the main phases of TS-NPs for AC:NA and U:MC, respectively. Particle size and histogram of nanopowders were characterized by transmission electron microscopy (TEM) and dynamic light scattering (DLS). Optical properties of TS-NPs were calculated by Fourier transform infrared spectroscopy (FTIR) and Kramers–Kroning (KK) relation. Plasma frequencies of TS-NPs obtained from energy loss functions depend on fuels as a result of changes in crystal structure, particle size distribution, and morphology.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-24T07:10:50Z
      DOI: 10.1142/S021798491650247X
       
  • The effects of drivers’ aggressive characteristics on traffic
           stability from a new car-following model
    • Authors: Guanghan Peng, Li Qing
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, a new car-following model is proposed by considering the drivers’ aggressive characteristics. The stable condition and the modified Korteweg-de Vries (mKdV) equation are obtained by the linear stability analysis and nonlinear analysis, which show that the drivers’ aggressive characteristics can improve the stability of traffic flow. Furthermore, the numerical results show that the drivers’ aggressive characteristics increase the stable region of traffic flow and can reproduce the evolution and propagation of small perturbation.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-24T07:10:37Z
      DOI: 10.1142/S0217984916502432
       
  • Theoretical exploration of harmonic emission and attosecond
           pulse generation from H[math] in the presence of terahertz pulse
    • Authors: Hang Liu, Liqiang Feng
      Abstract: Modern Physics Letters B, Ahead of Print.
      Harmonic generation spectra from H[math] molecule ion driven by the chirped pulse combined with a terahertz (THz) pulse have been theoretically investigated by numerically solving the non-Born–Oppenheimer time-dependent Schrödinger equation (NBO-TDSE). The results show that with the introduction of the chirp, the harmonic cutoff is extended, resulting in a smooth supercontinuum. Further, when the initial vibrational state is prepared as [math], and by properly adding a THz controlling pulse, the harmonic yield is enhanced by almost six orders of magnitude compared with the single chirped pulse case. Quantum analyses are shown to explain the harmonic extension and enhancement. Furthermore, through the investigation of the isotopic effect, we find that more intense harmonics are generated in the lighter nucleus. Finally, by properly superposing the harmonics, a series of intense 35 as XUV pulses can be obtained, which are almost six orders of magnitude improvement in comparison with the single chirped pulse case.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-21T08:28:09Z
      DOI: 10.1142/S0217984916502262
       
  • Low half-wave voltage Y-branch electro-optic polymer
           modulator based on side-chain polyurethane-imide
    • Authors: Jie Tang, Long-De Wang, Ruo-Zhou Li, Qiang Zhang, Tong Zhang
      Abstract: Modern Physics Letters B, Ahead of Print.
      A Y-branch electro-optic (EO) polymer modulator has been designed and fabricated. High performance side-chain polyurethane-imide (PUI) with a high EO coefficient of larger than 50 pm/V and a moderate glass-transition temperature [math] of 206[math]C is used as EO polymer core layer of the modulator. The fabricated phase modulator exhibits a low half-wave voltage of 1.94 V at 1550 nm in single arm modulation with 1 cm EO interaction length and 2 cm total length. The results show that the modulator fabricated by side-chain PUI EO materials possesses potential applications in low driving voltage and low cost optical systems.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-21T08:28:08Z
      DOI: 10.1142/S0217984916502286
       
  • Controlling and synchronizing the spatiotemporal chaos
           of photorefractive ring oscillators with coupling
    • Authors: Xiaoxiao Chen, Xiuqin Feng, Zuolin Tian, Zhihai Yao
      Abstract: Modern Physics Letters B, Ahead of Print.
      We present the control and synchronization of spatiotemporal chaos in the photo-refractive ring oscillator systems with coupling technology. First, we realize the synchronization of spatiotemporal chaos in the two photorefractive ring oscillator systems via mutual coupling by choosing a suitable coupling strength. With the mutual coupling strength enlarging, the two mutual coupling photorefractive ring oscillator systems are controlled into periodic state, period number differs on account of the coupling strength and lattice coordinates. By increasing the coupling strength, the photorefractive ring oscillator is converted into period 8, subsequently it is converted into periods 4 and 2, periodic synchronization of the photorefractive ring oscillator systems is achieved at the same time. Calculation results show that period 1 is impossible by mutual coupling technology. Then, we investigate the influence of noise and parameter deviation on chaotic synchronization. We find that mutual coupling chaotic synchronization method can synchronize two chaotic systems with the weak noise and parameter deviation and has very good robustness. Given that the weak noise and parameter deviation have a slight effect on synchronization. Furthermore, we investigate two dimension control and synchronization of spatiotemporal chaos in the photorefractive ring osillator systems with coupling technology and get successful results. Mutual coupling technology is suitable in practical photorefractive ring oscillator systems.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-21T08:28:06Z
      DOI: 10.1142/S0217984916502365
       
  • The effect of electric field on the coherence time of a 2D RbCl parabolic
           quantum dot qubit
    • Authors: Xi-Jun Li, Jing-Lin Xiao
      Abstract: Modern Physics Letters B, Ahead of Print.
      The effects of the electric field on the coherence time of a 2D RbCl parabolic quantum dot (PQD) qubit are studied by using the variational method of Pekar type (VMPT) and the Fermi Golden Rule. We calculate the excitation energy of an electron strongly coupled to bulk longitudinal optical (LO) phonons in the 2D RbCl PQD under an applied electric field. The phonon spontaneous emission causes the decoherence of the qubit. The investigated results indicate that the coherence time increases with increasing strength of the electric field and the effective confinement length, whereas it decreases with increasing polaron radius. Our research results would be useful for the design and implementation of the solid-state quantum computation.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-21T08:28:04Z
      DOI: 10.1142/S0217984916502584
       
  • Alteration in non-classicality of light on passing through
           a linear polarization beam splitter
    • Authors: Namrata Shukla, Ranjana Prakash
      Abstract: Modern Physics Letters B, Ahead of Print.
      We observe the polarization squeezing in the mixture of a two mode squeezed vacuum and a simple coherent light through a linear polarization beam splitter. Squeezed vacuum not being squeezed in polarization, generates polarization squeezed light when superposed with coherent light. All the three Stokes parameters of the light produced on the output port of polarization beam splitter are found to be squeezed and squeezing factor also depends upon the parameters of coherent light.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-21T08:27:53Z
      DOI: 10.1142/S0217984916502894
       
  • Dynamics of entanglement among the environment oscillators of a many-body
           system
    • Authors: A. L. de Paula, Dagoberto S. Freitas
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this work, we extend the discussion that began in Ref. 16 [A. L. de Paula, Jr., J. G. G. de Oliveira, Jr., J. G. P. de Faria, D. S. Freitas and M. C. Nemes, Phys. Rev. A 89 (2014) 022303] to deal with the dynamics of the concurrence of a many-body system. In that previous paper, the discussion was focused on the residual entanglement between the partitions of the system. The purpose of the present contribution is to shed some light on the dynamical properties of entanglement among the environment oscillators. We consider a system consisting of a harmonic oscillator linearly coupled to [math] others and solve the corresponding dynamical problem analytically. We divide the environment into two arbitrary partitions and the entanglement dynamics between any of these partitions is quantified and it shows that in the case when excitations in each partition are equal, the concurrence reaches the value 1 and the two partitions of the environment are maximally entangled. For long times, the excitations of the main oscillator are completely transferred to environment and the environment oscillators are found entangled.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-20T08:32:33Z
      DOI: 10.1142/S0217984916502225
       
  • Long-wavelength lattice vibrations of Ag3In5Se9 and Ag3In5Te9
           single crystals: An inversion of LO- and TO-mode frequencies
    • Authors: Nizami Mamed Gasanly
      Abstract: Modern Physics Letters B, Ahead of Print.
      Infrared (IR) reflectivities are registered in the frequency range of 50–2000 cm[math] for Ag3In5Se9 and Ag3In5Te9 single crystals grown by Bridgman method. Three infrared-active modes are detected in spectra. The optical parameters, real and imaginary parts of the dielectric function, the function of energy losses, refractive index, absorption index and absorption coefficient were calculated from reflectivity experiments. The frequencies of transverse and longitudinal optical modes (TO and LO modes) and oscillator strength were also determined. The bands detected in infrared spectra were tentatively attributed to various vibration types (valence and valence-deformation). The inversion of LO- and TO-mode frequencies of the sandwiched pair was observed for studied crystals.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-20T08:32:32Z
      DOI: 10.1142/S0217984916502298
       
  • Structural properties of Al and TiAl3 metallic glasses: An embedded atom
           method study
    • Authors: M. Tahiri, S. Trady, A. Hasnaoui, M. Mazroui, K. Saadouni, K. Sbiaai
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, we investigated the structural properties of metallic glasses (MGs). We emphasized our study on monatomic Al and binary TiAl3 systems. The calculations are performed by using the molecular dynamics (MD) simulation based on semi-empirical many-body potentials derived from the embedded atom method. The structure is analyzed using the radial distribution function (RDF), the common neighbor analysis (CNA) and the coordination numbers (CNs). Our results demonstrated that it is possible to form MGs in both systems upon fast cooling from the liquid state. This is confirmed by the fact that the system energy and/or volume during the cooling stage decrease continuously with a slight change and by atomic scale analysis using the RDF, CNA and CN analyzing techniques. Furthermore, this specific study shows that under the same conditions, the icosahedral structures appeared in TiAl3 are more abundant than in pure Al. Implications of these findings are discussed.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-14T08:38:37Z
      DOI: 10.1142/S0217984916501700
       
  • Analytic study of heat transfer with variable viscosity on solid particle
           motion in dusty Jeffery fluid
    • Authors: M. M. Bhatti, A. Zeeshan
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, effects of variable viscosity with heat transfer on solid particle motion of dusty Jeffrey fluid model through a planar channel has been examined. The governing flow problem for fluid phase and dusty phase is formulated with the help of momentum and energy equation. The resulting coupled ordinary differential equations have been solved analytically and closed form solutions are presented. The influence of all the physical parameters are sketched for velocity profile, pressure rise and temperature profile. Numerical computation is used to evaluate the expression for pressure rise. The present analysis is also presented for Newtonian fluid by taking [math] as a special case of our study. It is found that due to the influence of variable viscosity, the fluid velocity changes in the center of the channel and shows opposite behavior near the walls. It is also found that temperature profile increases for larger values of Prandtl number (Pr) and Eckert number (Ec).
      Citation: Modern Physics Letters B
      PubDate: 2016-06-14T08:38:35Z
      DOI: 10.1142/S0217984916501967
       
  • A DFT study of pressure-induced phase transitions, structural and
           electronic properties of Cu2ZnSnS4
    • Authors: Yifen Zhao, Decong Li, Zuming Liu
      Abstract: Modern Physics Letters B, Ahead of Print.
      The structural properties, phase transitions, and electronic structures of Cu2ZnSnS4 (CZTS) in the three structures have been researched using the first-principles density functional theory (DFT). The results indicate that the energies of stannite (ST) and pre-mixed Cu–Au (PMCA) CZTS are higher than those of kesterite (KS) CZTS, indicating that the KS CZTS is more stable. We found the phase transition pressure between the KS and ST structures of CZTS is about 32 GPa. Moreover, for KS- and PMCA-CZTS, there exists in the mischcrystal phase between 52 GPa and 65 GPa. The band structures show that the KS- and ST-CZTS are direct band gap semiconductors. The band gaps of three-type CZTS increase with increasing pressure, and the maximum band gap of KS and ST structures for CZTS occurs at 50 GPa. However, PMCA CZTS possesses metal property. Furthermore, the PMCA CZTS translates from metal to the indirect semiconductor with increasing pressure. The results play an important role in future experimental and theoretical work for CZTS materials.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-14T08:38:34Z
      DOI: 10.1142/S0217984916501761
       
  • Effect of anisotropy on deep cellular crystal growth in directional
           solidification
    • Authors: Han Jiang, Ming-Wen Chen, Guo-Dong Shi, Tao Wang, Zi-Dong Wang
      Abstract: Modern Physics Letters B, Ahead of Print.
      The effect of anisotropic surface tension and anisotropic interface kinetics on deep cellular crystal growth is studied. An asymptotic solution of deep cellular crystal growth in directional solidification is obtained by using the matched asymptotic expansion method and the multiple variable expansion method. The results show that as the anisotropic parameters increase, the total length of deep cellular crystal increases and the root depth increases, whereas the curvature of the interface near the root increases or the curvature radius decreases.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-10T10:40:21Z
      DOI: 10.1142/S0217984916502055
       
  • First-principles study of Mg(0001)/MgO(1-11) interfaces
    • Authors: Hong-Quan Song, Ming Zhao, Jian-Guo Li
      Abstract: Modern Physics Letters B, Ahead of Print.
      By means of first-principles density-functional calculations, we studied the surface energy of a nonstoichiometric MgO(1-11) slab, the interfacial energy and interfacial bonding characteristics of Mg-terminated and O-terminated Mg/MgO(1-11) interfaces with three stacking-site (TOP, HCP and FCC sites) models, and the effect of the thickness of Mg films on the O-terminated MgO(1-11) surface. The results indicate that the surface energies of the nonstoichiometric MgO(1-11) slab and interfacial energies of Mg/Mg(1-11) interface depend on Mg chemical potential. We found that the Mg-terminated MgO(1-11) surface is more stable than the O-terminated MgO(1-11) surface at high Mg chemical potential, and Mg/MgO(1-11) with FCC stacking-site model is the most stable configuration in the Mg/MgO(1-11) interfaces. The results of the electronic structure reveals that the interfacial bonding of Mg-terminated interface with FCC site model mainly consists of metallic bond and of the O-terminated interface with FCC site model is mainly ionic with a small degree of [math]-type covalent bond. Although the interfacial energy of Mg-terminated Mg/MgO interface with FCC stacking-site model is slightly higher than that of O-terminated Mg/MgO interface, the molten Mg would epitaxially grow on the FCC sites of the Mg-terminated MgO(1-11) surface because of the high evaporation pressure of Mg at high temperature.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-09T03:28:42Z
      DOI: 10.1142/S0217984916501529
       
  • Particle interactions in three-dimensional electrical field
           simulated by iterative dipole moment method
    • Authors: Le Liu, Chuanchuan Xie, Bo Chen, Jiankang Wu
      Abstract: Modern Physics Letters B, Ahead of Print.
      The dielectrophoresis (DEP) interactions of a few particles in a uniform two-dimensional (2D) electrical field have well been studied by Maxwell stress tensor (MST) method. Multiple particle interactions in three-dimensional (3D) electrical field are investigated in this work using iterative dipole moment (IDM) method which is an analytic algorithm without complicated numerical computations to solve for electrical field. The interactive DEP forces of particles calculated by IDM are found to be well agreed with those of MST method and much simple to implement. Using IDM method, a series of examples of multiple particles interactions and particle chains in a 3D uniform DC electrical field is presented. Randomly distributed similar dense particles (either all positive DEP (pDEP) or all negative DEP (nDEP) particles) in 3D uniform electrical field can generally form chains in lines parallel to the electrical field, except the case that all similar particles are in a plane perpendicular to the electrical field where the particles repel each other and move away in the plane. Randomly distributed dissimilar dense particles (mixture of pDEP and nDEP particles) can form (1) chains in lines, (2) clusters in a plane or (3) 3D groups. The chains, clusters and groups are of staggered arrangements of pDEP and nDEP particles, which are perpendicular to the electrical field.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-09T03:28:40Z
      DOI: 10.1142/S0217984916501566
       
  • Thermodynamics of defect subsystem in zinc telluride crystals
    • Authors: I. V. Horichok, L. I. Nykyruy, T. O. Parashchuk, S. D. Bardashevska, M. P. Pylyponuk
      Abstract: Modern Physics Letters B, Ahead of Print.
      Using method on the base of minimizing of thermodynamic potential in “crystal-vapor” system as a function of defect concentration the equilibrium concentration of point defects and free charge carriers in zinc telluride (ZnTe) crystals have been calculated depending on the technological factors of two-temperature annealing (annealing temperature [math] and vapor pressure [math] of zinc or [math] of tellurium). It is shown that the dominant defects are zinc vacancies the charge state of which depends on the technological conditions of annealing.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-09T03:28:40Z
      DOI: 10.1142/S0217984916501724
       
  • Electronic transport and shot noise in a Thue–Morse bilayer graphene
           superlattice with interlayer potential bias
    • Authors: Yuanqiao Li, Hongmei Zhang, De Liu
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, we evaluate the transport properties of a Thue–Morse AB-stacked bilayer graphene superlattice with different interlayer potential biases. Based on the transfer matrix method, the transmission coefficient, the conductance, and the Fano factor are numerically calculated and discussed. We find that the symmetry of the transmission coefficient with respect to normal incidence depends on the structural symmetry of the system and the new transmission peak appears in the energy band gap opening region. The conductance and the Fano factor can be greatly modulated not only by the Fermi energy and the interlayer potential bias but also by the generation number. Interestingly, the conductance exhibits the plateau of almost zero conductance and the Fano factor plateaus with Poisson value occur in the energy band gap opening region for large interlayer potential bias.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-09T03:28:39Z
      DOI: 10.1142/S0217984916501815
       
  • Optical packet header identification utilizing an all-optical feedback
           chaotic reservoir computing
    • Authors: Jie Qin, Qingchun Zhao, Dongjiao Xu, Hongxi Yin, Ying Chang, Degen Huang
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, an all-optical reservoir computing (RC) setup is proposed for identifying the types of optical packet headers in optical packet switching (OPS) network. The numerical simulation identification results of 3 bits and 32 bits optical headers with the bit rate of 10 Gbps are as low as 0.625% and 2.25%, respectively. The identification errors with the variation of the feedback strength and feedback delay are presented separately. Hence, the optimal feedback parameters are obtained. The all-optical feedback RC setup is robust to the white Gaussian noise. The recognition error is acceptable when the signal-to-noise ratio (SNR) is greater than 15 dB.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-09T03:28:39Z
      DOI: 10.1142/S0217984916501992
       
  • Analytical and numerical study on cooling flow field designs performance
           of PEM fuel cell with variable heat flux
    • Authors: Ebrahim Afshari, Masoud Ziaei-Rad, Nabi Jahantigh
      Abstract: Modern Physics Letters B, Ahead of Print.
      In PEM fuel cells, during electrochemical generation of electricity more than half of the chemical energy of hydrogen is converted to heat. This heat of reactions, if not exhausted properly, would impair the performance and durability of the cell. In general, large scale PEM fuel cells are cooled by liquid water that circulates through coolant flow channels formed in bipolar plates or in dedicated cooling plates. In this paper, a numerical method has been presented to study cooling and temperature distribution of a polymer membrane fuel cell stack. The heat flux on the cooling plate is variable. A three-dimensional model of fluid flow and heat transfer in cooling plates with 15 cm × 15 cm square area is considered and the performances of four different coolant flow field designs, parallel field and serpentine fields are compared in terms of maximum surface temperature, temperature uniformity and pressure drop characteristics. By comparing the results in two cases, the constant and variable heat flux, it is observed that applying constant heat flux instead of variable heat flux which is actually occurring in the fuel cells is not an accurate assumption. The numerical results indicated that the straight flow field model has temperature uniformity index and almost the same temperature difference with the serpentine models, while its pressure drop is less than all of the serpentine models. Another important advantage of this model is the much easier design and building than the spiral models.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-09T03:28:38Z
      DOI: 10.1142/S0217984916501554
       
  • A simple method for laser-induced plasma diagnostics under condition of
           optically thin
    • Authors: Jian He, Qingguo Zhang
      Abstract: Modern Physics Letters B, Ahead of Print.
      For simple plasma diagnostics for laser-induced plasma (LIP) under the condition of optically thin, taking the Cu I spectral lines produced by the laser-induced copper plasma, we investigate a simple method for temperature and electron density diagnostics, and we obtain the plasma temperature which has 104 K order of magnitude and the averaged electron density is [math], which are in agreement with that obtained by other methods. This investigation will be significant for spectral diagnostics for LIP.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-09T03:28:37Z
      DOI: 10.1142/S0217984916501979
       
  • Effects of heterogeneous traffic with speed limit zone on the car
           accidents
    • Authors: R. Marzoug, N. Lakouari, K. Bentaleb, H. Ez-Zahraouy, A. Benyoussef
      Abstract: Modern Physics Letters B, Ahead of Print.
      Using the extended Nagel–Schreckenberg (NS) model, we numerically study the impact of the heterogeneity of traffic with speed limit zone (SLZ) on the probability of occurrence of car accidents [math]. SLZ in the heterogeneous traffic has an important effect, typically in the mixture velocities case. In the deterministic case, SLZ leads to the appearance of car accidents even in the low densities, in this region [math] increases with increasing of fraction of fast vehicles [math]. In the nondeterministic case, SLZ decreases the effect of braking probability [math] in the low densities. Furthermore, the impact of multi-SLZ on the probability [math] is also studied. In contrast with the homogeneous case [X. Li, H. Kuang, Y. Fan and G. Zhang, Int. J. Mod. Phys. C 25 (2014) 1450036], it is found that in the low densities the probability [math] without SLZ [math] is low than [math] with multi-SLZ ([math]). However, the existence of multi-SLZ in the road decreases the risk of collision in the congestion phase.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-09T03:28:34Z
      DOI: 10.1142/S0217984916501281
       
  • Investigation on multilayer microstructure grating
           for three-port splitting
    • Authors: Wenhao Shu, Bo Wang, Hao Pei, Hongtao Li, Li Chen, Liang Lei, Jinyun Zhou
      Abstract: Modern Physics Letters B, Ahead of Print.
      A new structure of microstructure reflection three-port beam splitter grating is described in this paper. The grating includes two dielectric layers and a metal slab on the substrate, where incident waves are reflected into the zeroth-order and the ± first-order with polarization-independent property. With the optimized grating profile, reflection efficiencies’ ratios between the first-order and the zeroth-order can reach 0.998 and 1.001 for TE and TM polarizations, respectively. Especially, the reflection grating can diffract efficiencies more than 30% into the ± first-order and the zeroth-order with the incident angular bandwidth of −1.9–1.9[math] for TM polarization, which can have merits compared with single-layer transmission grating.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-06T06:45:29Z
      DOI: 10.1142/S0217984916501955
       
 
 
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