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PHYSICS (573 journals)

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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]
  • Coherent structures induced by dielectric barrier discharge plasma
           actuator
    • Authors: Xin Zhang, Huaxing Li, Kwing So Choi, Longfei Song
      Abstract: Modern Physics Letters B, Volume 31, Issue 32, 20 November 2017.
      The structures of a flow field induced by a plasma actuator were investigated experimentally in quiescent air using high-speed Particle Image Velocimetry (PIV) technology. The motivation behind was to figure out the flow control mechanism of the plasma technique. A symmetrical Dielectric Barrier Discharge (DBD) plasma actuator was mounted on the suction side of the SC (2)-0714 supercritical airfoil. The results demonstrated that the plasma jet had some coherent structures in the separated shear layer and these structures were linked to a dominant frequency of [math] = 39 Hz when the peak-to-peak voltage of plasma actuator was 9.8 kV. The high speed PIV measurement of the induced airflow suggested that the plasma actuator could excite the flow instabilities which lead to production of the roll-up vortex. Analysis of transient results indicated that the roll-up vortices had the process of formation, movement, merging and breakdown. This could promote the entrainment effect of plasma actuator between the outside airflow and boundary layer flow, which is very important for flow control applications.
      Citation: Modern Physics Letters B
      PubDate: 2017-11-20T03:33:57Z
      DOI: 10.1142/S0217984918500380
       
  • Effect of current vehicle’s interruption on traffic stability in
           cooperative car-following theory
    • Authors: Geng Zhang, Hui Liu
      Abstract: Modern Physics Letters B, Ahead of Print.
      To reveal the impact of the current vehicle’s interruption information on traffic flow, a new car-following model with consideration of the current vehicle’s interruption is proposed and the influence of the current vehicle’s interruption on traffic stability is investigated through theoretical analysis and numerical simulation. By linear analysis, the linear stability condition of the new model is obtained and the negative influence of the current vehicle’s interruption on traffic stability is shown in the headway-sensitivity space. Through nonlinear analysis, the modified Korteweg–de Vries (mKdV) equation of the new model near the critical point is derived and it can be used to describe the propagating behavior of the traffic density wave. Finally, numerical simulation confirms the analytical results, which shows that the current vehicle’s interruption information can destabilize traffic flow and should be considered in real traffic.
      Citation: Modern Physics Letters B
      PubDate: 2017-11-22T02:36:19Z
      DOI: 10.1142/S0217984917503171
       
  • Titanium nitride nano-disk arrays-based metasurface as a perfect absorber
           in the visible range
    • Authors: Qiuqun Liang, Yongqi Fu, Xiongping Xia, Liu Wang, Rummei Gao
      Abstract: Modern Physics Letters B, Ahead of Print.
      An ultrathin metasurface-based absorber consisting of titanium nitride (TiN) nano-disk arrays–dielectric layer-TiN substrate is proposed in this paper. The absorber exhibits near-unity absorption in the whole visible range of 380–780 nm. Our results demonstrate that the proposed metasurface-based absorber is not only independent of light polarization, but also exhibits angle-independent absorption behavior for oblique incidence up to 70[math]. The high absorption performance of the TiN nano-disk arrays-based absorber can attribute to two different loss mechanisms associated with the intrinsic loss and plasmonic resonance.
      Citation: Modern Physics Letters B
      PubDate: 2017-11-22T02:36:18Z
      DOI: 10.1142/S0217984917503651
       
  • XUV pulse effect on harmonic emission spectra and attosecond pulse
           generation
    • Authors: Liqiang Feng, R. S. Castle, Yi Li
      Abstract: Modern Physics Letters B, Ahead of Print.
      The generation of the high-order harmonic and the attosecond pulse from He atom driven by the near-infrared (NIR) field combined with the XUV pulse has been theoretically investigated by solving the three-dimensional time-dependent Schrödinger equation. The results show that by properly adding the XUV pulse into the NIR field, (i) not only the harmonic yield is enhanced, caused by the laser-induced excited state effect; but also the multi-cutoff extension of the harmonics can be found, caused by the absorption of the extra XUV photons during its recombination process. (ii) With the introduction of the XUV pulse, the frequency modulation of the high-order harmonic generation (HHG) can be found and controlled. (iii) By directly superposing the harmonics in the cutoff region, two isolated XUV pulses with the durations of 150 as can be obtained.
      Citation: Modern Physics Letters B
      PubDate: 2017-11-21T09:23:50Z
      DOI: 10.1142/S0217984917502827
       
  • A gauge-invariant path integral for electrodynamics with magnetic
           monopoles in the Haddamard formalism
    • Authors: Luiz C. L. Botelho
      Abstract: Modern Physics Letters B, Ahead of Print.
      We propose a new path integral for QED in the presence of magnetic monopoles on the formalism of Geometric Algebra of Hestenes–Haddamard written in terms of Dirac matrices.
      Citation: Modern Physics Letters B
      PubDate: 2017-11-21T09:23:50Z
      DOI: 10.1142/S0217984917503080
       
  • Analysis of energy consumption and emission of the heterogeneous traffic
           flow consisting of traditional vehicles and electric vehicles
    • Authors: Hong Xiao, Hai-Jun Huang, Tie-Qiao Tang
      Abstract: Modern Physics Letters B, Ahead of Print.
      Electric vehicle (EV) has become a potential traffic tool, which has attracted researchers to explore various traffic phenomena caused by EV (e.g. congestion, electricity consumption, etc.). In this paper, we study the energy consumption (including the fuel consumption and the electricity consumption) and emissions of heterogeneous traffic flow (that consists of the traditional vehicle (TV) and EV) under three traffic situations (i.e. uniform flow, shock and rarefaction waves, and a small perturbation) from the perspective of macro traffic flow. The numerical results show that the proportion of electric vehicular flow has great effects on the TV’s fuel consumption and emissions and the EV’s electricity consumption, i.e. the fuel consumption and emissions decrease while the electricity consumption increases with the increase of the proportion of electric vehicular flow. The results can help us better understand the energy consumption and emissions of the heterogeneous traffic flow consisting of TV and EV.
      Citation: Modern Physics Letters B
      PubDate: 2017-11-21T09:23:49Z
      DOI: 10.1142/S0217984917503249
       
  • Comment on “Cryptanalysis and improvement of multiparty semiquantum
           secret sharing based on rearranging orders of qubits”
    • Authors: Gan Gao
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, we show that the attack strategy [A. Yin and F. Fu, Mod. Phys. Lett. B 30 (2016) 1650415] fails, that is, the last agent and other agents cannot get the sender’s secret keys without being detected by using the attack strategy.
      Citation: Modern Physics Letters B
      PubDate: 2017-11-21T09:23:49Z
      DOI: 10.1142/S021798491775001X
       
  • Optimal selection of photo-ionization and electric field ionization
    • Authors: Xiao-Qiu Qi, Chang-Jian Dai, Zhen-Xiang Zhong
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, the dynamic characteristics of the two approaches of atomic ionization, photo-excitation plus photo-ionization (PE+PI) and the photo-excitation plus electric field ionization (PE+EFI) are investigated systematically. For the PE+PI process, two different schemes (I and II), with and without overlapping pulse duration, are designed and specified. The rate equations for both PE+PI and PE+EFI processes are established, numerical solutions of which provide profound characteristics. A detailed analysis of the theoretical results is carried out to observe the impacts on their overall ionization efficiency made by several factors, either atomic or laser parameters. Not only the ionization efficiency of both approaches is given, but also the optimal selection under some specific conditions is discussed. If the pulse widths of lasers are fixed, then the PE+EFI approach is superior to the PE+PI approach when laser powers are small, while the PE+PI approach is better otherwise.
      Citation: Modern Physics Letters B
      PubDate: 2017-11-21T09:23:48Z
      DOI: 10.1142/S0217984917503195
       
  • Generating squeezed states of a nanomechanical resonator
           via a charge qubit in a hybrid system
    • Authors: Chao-Quan Wang, Jian Zou, Zhi-Ming Zhang
      Abstract: Modern Physics Letters B, Ahead of Print.
      We propose a scheme for generating squeezed states of a nanomechanical resonator. The scheme is based on a hybrid system consisting of two NAMRs and a superconducting charge qubit (SCCQ). The nonlinear interaction between the two nanomechanical resonators (NAMRs) can be implemented by setting the external biased flux of the SCCQ at some certain values, which plays the role of “nonlinear media”. The noise in the SCCQ does not need to be considered, since we can adiabatically keep the SCCQ at the ground state. In addition, the squeezing parameters can also be adjusted by changing the external driving voltage.
      Citation: Modern Physics Letters B
      PubDate: 2017-11-15T09:34:00Z
      DOI: 10.1142/S0217984917503432
       
  • Bond length (Ti–O) dependence of nano ATO3-based (A = Pb, Ba, Sr)
           perovskite structures: Optical investigation in IR range
    • Authors: Mahdi Ghasemifard, Misagh Ghamari, Cengiz Okay
      Abstract: Modern Physics Letters B, Ahead of Print.
      In the current study, ABO3 (A = Pb, Ba, Sr and B = Ti) perovskite structures are produced by the auto-combustion route by using citric acid (CA) and nitric acid (NA) as fuel and oxidizer. The X-ray diffraction (XRD) patterns confirmed the perovskite nanostructure with cubic, tetragonal, and rhombohedral for SrTiO3, PbTiO3, and BaTiO3, respectively. Using Scherrer’s equation and XRD pattern, the average crystallite size of the samples were acquired. The effect of Ti–O bond length on the structure of the samples was evaluated. The type of structures obtained depends on Ti–O bond length which is in turn influenced by A[math] substitutions. Microstructural studies of nanostructures calcined at 850[math]C confirmed the formation of polyhedral particles with a narrow size distribution. The values of optical band gaps were measured and the impact of A[math] was discussed. The optical properties such as the complex refractive index and dielectric function were calculated by IR spectroscopy and Kramers–Kronig (K–K) relations. Lead, as the element with the highest density as compared to other elements, changes the optical constants, remarkably due to altering titanium and oxygen distance in TO6 groups.
      Citation: Modern Physics Letters B
      PubDate: 2017-11-15T08:16:59Z
      DOI: 10.1142/S0217984917503560
       
  • Broadband anomalous reflection caused by unsymmetrical specific acoustic
           impedance in phononic crystals
    • Authors: S. K. Han, C. W. Wu, Z. Chen
      Abstract: Modern Physics Letters B, Ahead of Print.
      We investigate through numerical simulation the anomalous reflection (AR) of acoustic waves with perfect phononic crystals (PCs). Broadband AR is observed in a wide angle for the oblique incidence. The AR is due to the unsymmetrical specific acoustic impedance (SAI) profile along the surface, which is caused by the high frequency incidence. The findings in this paper complement the theories for the AR of acoustic waves with PCs, and may find applications in acoustic engineerings.
      Citation: Modern Physics Letters B
      PubDate: 2017-11-15T08:16:56Z
      DOI: 10.1142/S0217984917503572
       
  • Experimental determination of the field shift factor and the mass shift
           coefficient for the 1S0–3P1 spin-forbidden transition at 791 nm in
           neutral barium
    • Authors: Geng-Hua Yu, Hui Yan, Jia-Qi Zhong, Hong Liu, Xiao-Ling Zhu, Wei Yang
      Abstract: Modern Physics Letters B, Ahead of Print.
      The experimental measurements of the isotope shifts (ISs) for the 1S0–3P1 spin-forbidden transition at 791 nm in neutral barium have been carried out with a thermal barium atom beam. The hyperfine structure (HFS) constants a and b of the odd isotopes [math]Ba and [math]Ba for this transition have been extracted from the experimental results: a([math]Ba) = 1149.9(1.0) MHz, b([math]Ba)= −41.6(0.5) MHz, a([math]Ba) = 1028.0(1.0) MHz, b([math]Ba) = −27.5(0.5) MHz. The measured IS results with the reference isotope [math]Ba are 183.7(1.0) MHz ([math]Ba–[math]Ba), 108.5(0.3) MHz ([math]Ba–[math]Ba) and 218.9(1.0) MHz ([math]Ba–[math]Ba). Our IS measurements are in good agreement with the previous experiments. The field shift (FS) factor [math] and the mass shift (MS) coefficient [math] for this spin-forbidden transition have be determined experimentally as −3.19(4) GHz ⋅ fm[math] and −242(20) GHz ⋅ amu, respectively. The results provided herein could be used for further checks theoretically and experimentally, and could also contribute to the study on the nuclear structure of the barium isotopic nuclei.
      Citation: Modern Physics Letters B
      PubDate: 2017-11-15T08:16:55Z
      DOI: 10.1142/S0217984917503596
       
  • Atomistic full-quantum transport model for zigzag
           graphene nanoribbon-based structures: Complex energy-band method
    • Authors: Chun-Nan Chen, Win-Jet Luo, Feng-Lin Shyu, Hsien-Ching Chung, Chiun-Yan Lin, Jhao-Ying Wu
      Abstract: Modern Physics Letters B, Ahead of Print.
      Using a non-equilibrium Green’s function framework in combination with the complex energy-band method, an atomistic full-quantum model for solving quantum transport problems for a zigzag-edge graphene nanoribbon (zGNR) structure is proposed. For transport calculations, the mathematical expressions from the theory for zGNR-based device structures are derived in detail. The transport properties of zGNR-based devices are calculated and studied in detail using the proposed method.
      Citation: Modern Physics Letters B
      PubDate: 2017-11-13T09:02:36Z
      DOI: 10.1142/S0217984917503559
       
  • Multi-band terahertz metasurface absorber
    • Authors: Xuying Wang, Qingmin Wang, Guoyan Dong, Yanan Hao, Ming Lei, Ke Bi
      Abstract: Modern Physics Letters B, Ahead of Print.
      A terahertz metasurface perfect absorber with multi-band performance is demonstrated. The absorber is composed of a ground plane and four split-ring resonators (SRRs) with different dimensions, separated by a dielectric spacer. The numerical simulation results illustrate that the proposed absorber has four distinct absorption peaks at resonance frequencies of 4.24, 5.66, 7.22, and 8.97 THz, with absorption rates of 96.8%, 99.3%, 97.3%, and 99.9%, respectively. Moreover, the corresponding full width at half-maximum (FWHM) values are about 0.27, 0.35, 0.32, and 0.42 THz, respectively, which are much broader than those of previously reported absorbers. Besides, the calculated magnetic field distributions allow us to understand the absorption mechanism in detail. The effects of incident angle and azimuthal angle on the absorber are also investigated. The results show that the proposed absorber is partially sensitive to the incident angle, which makes this design promising for practical applications in terahertz imagers and detectors.
      Citation: Modern Physics Letters B
      PubDate: 2017-11-13T09:02:35Z
      DOI: 10.1142/S0217984917503547
       
  • Semiclassical transport through a mesostructure and distribution of
           classical trajectories
    • Authors: Yanhui Zhang, Lisha Kang, Xiulan Xu, Xu Tang, Hongbo Li, Xiangji Cai
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, we theoretically study the ballistic transport through a weakly open circular mesostructure within the framework of pseudopath semiclassical approximation. By defining the interference factor and comparing it numerically with the transmission amplitude, we demonstrate that the fluctuations in transmission amplitude are mainly due to the interference effects between different classical trajectories. In addition, we calculate the Fano factor versus cutoff length of classical trajectories in the energy domain to illustrate that the fluctuations in transmission amplitude mainly arise from the contribution of short-length classical trajectories. We further show that the transmission length power spectra not only associate with a lot of classical trajectories but with a series of nonclassical trajectories due to the diffraction scattering effects. Moreover, we show that the classical trajectories distributed in the mode–mode coupling function give the largest contribution to the corresponding transmission amplitude. We hope that our results and analysis can be used to reveal new effects of mesoscopic systems and to provide theoretical basis for the design of mesoscopic devices.
      Citation: Modern Physics Letters B
      PubDate: 2017-11-10T06:09:52Z
      DOI: 10.1142/S0217984917300046
       
  • A new corresponding state-based correlation
           for the surface tension of organic fatty acids
    • Authors: Cuihua Zhang, Jianxiang Tian, Mengmeng Zheng, Huili Yi, Laibin Zhang, Shuzhen Liu
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, we proposed a new corresponding state-based correlation for organic fatty (aliphatic, carboxylic and polyfunctional) acids. By using the recently published surface tension data of the 99 acids [A. Mulero and I. Cachadiña, J. Phys. Chem. Ref. Data 45 (2016) 033105] and comparing with the recently published other corresponding state correlations, we found that this correlation reproduces the lowest absolute average deviation (AAD) values for 82 acids out of the 99 acids. It can reproduce the surface tension data with AAD less than 10% for 89 out of the 99 acids.
      Citation: Modern Physics Letters B
      PubDate: 2017-11-10T06:09:52Z
      DOI: 10.1142/S0217984917503614
       
  • Quenching and room-temperature annealing effects on the conductivity of
           underdoped HoBa[math]Cu[math]O[math]
    • Authors: G. Ya. Khadzhai, R. V. Vovk, N. R. Vovk, Yu. I. Boiko, S. N. Kamchatnaya, V. M. Pinto Simoes, O. V. Dobrovolskiy
      Abstract: Modern Physics Letters B, Ahead of Print.
      The effects of quenching from 600[math]C and subsequent room-temperature annealing on the basal-plane electrical resistivity of underdoped HoBa2Cu3O[math] single crystals are investigated. Regions with different superconducting transition temperatures, [math], have been revealed in the sample after quenching and attributed to a non-uniform distribution of the labile oxygen in the sample volume. Room-temperature annealing has been revealed to lead to an increase of [math] of all regions and a decrease of their number, attributed to the coalescence of clusters of oxygen vacancies. The temperature dependence of the resistance in the normal state is characterized by a decrease of the residual resistivity and the phonon scattering coefficient.
      Citation: Modern Physics Letters B
      PubDate: 2017-11-10T06:09:51Z
      DOI: 10.1142/S0217984917503675
       
  • Reliability analysis of degradable networks with modified BPR
    • Authors: Yu-Qing Wang, Chao-Fan Zhou, Bin Jia, Hua-Bing Zhu
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, the effect of the speed limit on degradable networks with capacity restrictions and the forced flow is investigated. The link performance function considering the road capacity is proposed. Additionally, the probability density distribution and the cumulative distribution of link travel time are introduced in the degradable network. By the mean of distinguishing the value of the speed limit, four cases are discussed, respectively. Means and variances of link travel time and route one of the degradable road network are calculated. Besides, by the mean of performing numerical simulation experiments in a specific network, it is found that the speed limit strategy can reduce the travel time budget and mean travel time of link and route. Moreover, it reveals that the speed limit strategy can cut down variances of the travel time of networks to some extent.
      Citation: Modern Physics Letters B
      PubDate: 2017-11-10T02:45:08Z
      DOI: 10.1142/S0217984917503535
       
  • Parameter estimation for chaotic systems using improved bird swarm
           algorithm
    • Authors: Chuangbiao Xu, Renhuan Yang
      Abstract: Modern Physics Letters B, Ahead of Print.
      Parameter estimation of chaotic systems is an important problem in nonlinear science and has aroused increasing interest of many research fields, which can be basically reduced to a multidimensional optimization problem. In this paper, an improved boundary bird swarm algorithm is used to estimate the parameters of chaotic systems. This algorithm can combine the good global convergence and robustness of the bird swarm algorithm and the exploitation capability of improved boundary learning strategy. Experiments are conducted on the Lorenz system and the coupling motor system. Numerical simulation results reveal the effectiveness and with desirable performance of IBBSA for parameter estimation of chaotic systems.
      Citation: Modern Physics Letters B
      PubDate: 2017-11-10T02:45:07Z
      DOI: 10.1142/S0217984917503468
       
  • First-principles study on the structural, elastic and electronic
           properties of Ti4N3 and Ti6N5 under high pressure
    • Authors: Ruike Yang, Bao Chai, Chuanshuai Zhu, Qun Wei, Zheng Du
      Abstract: Modern Physics Letters B, Ahead of Print.
      The structural, elastic and electronic properties of Ti4N3 and Ti6N5 have been systematically studied by first-principles calculations based on density functional theory (DFT) with generalized gradient approximation (GGA) and local density approximation (LDA). Basic physical properties for Ti4N3 and Ti6N5, such as the lattice constants, the bulk modulus, shear modulus, and elastic constants are calculated. The results show that Ti4N3 and Ti6N5 are mechanically stable under ambient pressure. The phonon dispersion spectra are researched throughout the Brillouin zone via the linear response approach as implemented in the CASTEP code, which indicate the optimized structures are stable dynamically. The Young’s modulus E and Poisson’s ratios [math] are also determined within the framework of the Voigt–Reuss–Hill approximation. The analyses show that Ti4N3 is more ductile than Ti6N5 at the same pressure and ductility increases as the pressure increases. Moreover, the anisotropies of the Ti4N3 and Ti6N5 are discussed by the Young’s modulus at different directions, and the results indicate that the anisotropy of the two Ti–N compounds is obvious. The total density of states (TDOS) and partial density of states (PDOS) show that the TDOS of TiN, Ti4N3 and Ti6N5 originate mainly from Ti “d” and N “p” states. The results show that Ti4N3 and Ti6N5 present semimetal character. Pressure makes the level range of DOS significantly extended, for TiN, Ti4N3 and Ti6N5. The TDOS decreases with the pressure rise, at Fermi level.
      Citation: Modern Physics Letters B
      PubDate: 2017-11-10T02:45:06Z
      DOI: 10.1142/S0217984917503493
       
  • Three-phase receiving coil of wireless power transmission system for
           gastrointestinal robot
    • Authors: Z. W. Jia, T. Jiang, Y. Liu
      Abstract: Modern Physics Letters B, Ahead of Print.
      Power shortage is the bottleneck for the wide application of gastrointestinal (GI) robot. Owing to the limited volume and free change of orientation of the receiving set in GI trace, the optimal of receiving set is the key point to promote the transmission efficiency of wireless power transmission system. A new type of receiving set, similar to the winding of three-phase asynchronous motor, is presented and compared with the original three-dimensional orthogonal coil. Considering the given volume and the space utilization ratio, the three-phase and the three-orthogonal ones are the parameters which are optimized and compared. Both the transmission efficiency and stability are analyzed and verified by in vitro experiments. Animal experiments show that the new one could provide at least 420 mW power in volume of [math] with a uniformity of 78.3% for the GI robot.
      Citation: Modern Physics Letters B
      PubDate: 2017-11-02T09:29:43Z
      DOI: 10.1142/S0217984917502773
       
  • First principle investigations of the Pbnm phase BiFeO[math],
           BiFe[math]Mn[math]O[math] and Bi[math]X[math]Fe[math]Mn[math]O[math]
           (XBFM) (X = Ce, Gd, Lu)
    • Authors: Ren Zhang, Yunhua Zhou, Yiyi Zhu, Yangyang Li, Liang Chu, Yonggang Min, Jian Zhang, Jianping Yang, Xing’ao Li
      Abstract: Modern Physics Letters B, Ahead of Print.
      The structural, magnetic, electronic and optical properties of Pbnm BiFeO3 (BFO), BiFe[math]Mn[math]O3 (BFM), Bi[math]X[math]Fe[math]Mn[math]O3 (XBFM) (X = Ce, Gd, Lu) have been investigated by the first principles within the PBE[math]+[math]U scheme. It is shown that the dopant Mn in the B sites and Ce (Gd, Lu) in the A sites improves the crystalline quality. The magnetic moments of Bi[math]Ce[math]Fe[math]Mn[math]O3 (CBFM) and Bi[math]Gd[math]Fe[math]Mn[math]O3 (GBFM) are 10 [math] and 16 [math] which mainly arises from the strongly localized unpaired 4f electrons of Ce and Gd, 3d electrons of Mn and Fe. While, as BFM, the magnetic moment of Bi[math]Lu[math]Fe[math]Mn[math]O3 (LBFM) is 9 [math] indicating no effect on the magnetization is made by Lu for its full 4f states. The densities of states of the five systems hint that CBFM is metallic and BFM, GBFM, LBFM are still semiconductors. The metallic properties of CBFM arise from the hybridization between Ce-4f and Mn-3d states which leads the Mn [math] states to be split into [math] and [math] lowering the bottom of the conduction band to cross the Fermi level. Furthermore, we also study the optical properties of Pbnm BiFeO3 (BFO), BiFe[math]Mn[math]O3 (BFM), Bi[math]X[math]Fe[math]Mn[math]O3 (XBFM) (X = Ce, Gd, Lu). In this work, the optical properties including the absorption spectrum, loss function, refractive index and reflectivity spectrum are discussed in detail.
      Citation: Modern Physics Letters B
      PubDate: 2017-11-02T09:29:43Z
      DOI: 10.1142/S0217984917503043
       
  • MoS2-wrapped microfiber-based multi-wavelength soliton fiber laser
    • Authors: Feifei Lu
      Abstract: Modern Physics Letters B, Ahead of Print.
      The single-, dual- and triple-wavelength passively mode-locked erbium-doped fiber lasers are demonstrated with MoS2 and polarization-dependent isolator (PD-ISO). The saturable absorber is fabricated by wrapping an MoS2 around a microfiber. The intracavity PD-ISO acts as a wavelength-tunable filter with a polarization controller (PC) by adjusting the linear birefringence. Single-wavelength mode-locked fiber laser can self-start with suitable pump power. With appropriate PC state, dual- and triple-wavelength operations can be observed when gains at different wavelengths reach a balance. It is noteworthy that dual-wavelength pulses exhibiting peak and dip sidebands, respectively, are demonstrated in the experiment. The proposed simple and multi-wavelength all-fiber conventional soliton lasers could possess potential applications in numerous fields, such as sensors, THz generations and optical communications.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-31T06:45:20Z
      DOI: 10.1142/S0217984917503031
       
  • Square array photonic crystal fiber-based surface
           plasmon resonance refractive index sensor
    • Authors: Min Liu, Xu Yang, Bingyue Zhao, Jingyun Hou, Ping Shum
      Abstract: Modern Physics Letters B, Ahead of Print.
      Based on surface plasmon resonance (SPR), a novel refractive index (RI) sensor comprising a square photonic crystal fiber (PCF) is proposed to realize the detection of the annular analyte. Instead of hexagon structure, four large air-holes in a square array are introduced to enhance the sensitivity by allowing two polarization directions of the core mode to be more sensitive. The gold is used as the only plasmonic material. The design purpose is to reduce the difficulty in gold deposition and enhance the RI sensitivity. The guiding properties and the effects of the parameters on the performance of the sensor are numerically investigated by the Finite Element Method (FEM). By optimizing the structure, the sensor can exhibit remarkable sensitivity up to 7250 nm/RIU and resolution of [math] RIU with only one plasmonic material, which is very competitive compared with the other reported externally coated and single-layer coated PCF-based SPR (PCF–SPR) sensors, to our best knowledge.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-26T04:10:04Z
      DOI: 10.1142/S0217984917503523
       
  • Room temperature ferromagnetism in pure and ion-doped SnO2 nanoparticles
    • Authors: A. T. Apostolov, I. N. Apostolova, S. Trimper, J. M. Wesselinowa
      Abstract: Modern Physics Letters B, Ahead of Print.
      Using a microscopic model taking into account the spin–phonon interactions we have studied the magnetic properties of pure and ion-doped SnO2 nanoparticles (NPs). The magnetization M in pure SnO2 NPs is due to surface oxygen vacancies. By doping with magnetic Co ion we observe a maximum in M for small Co-concentration, x = 1%, whereas for nonmagnetic Cu ion M increases with x. By Co-doping there is a local distribution for small Co-concentration, whereas by Cu this is not the case. It is shown that there is a strong connection between the lattice and M. The results are in good agreement with the experimental data.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-24T04:14:09Z
      DOI: 10.1142/S0217984917503511
       
  • Characteristics of solitary waves, quasiperiodic solutions, homoclinic
           breather solutions and rogue waves in the generalized variable-coefficient
           forced Kadomtsev–Petviashvili equation
    • Authors: Xue-Wei Yan, Shou-Fu Tian, Min-Jie Dong, Li Zou
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, the generalized variable-coefficient forced Kadomtsev–Petviashvili (gvcfKP) equation is investigated, which can be used to characterize the water waves of long wavelength relating to nonlinear restoring forces. Using a dependent variable transformation and combining the Bell’s polynomials, we accurately derive the bilinear expression for the gvcfKP equation. By virtue of bilinear expression, its solitary waves are computed in a very direct method. By using the Riemann theta function, we derive the quasiperiodic solutions for the equation under some limitation factors. Besides, an effective way can be used to calculate its homoclinic breather waves and rogue waves, respectively, by using an extended homoclinic test function. We hope that our results can help enrich the dynamical behavior of the nonlinear wave equations with variable-coefficient.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-24T04:14:04Z
      DOI: 10.1142/S021798491750350X
       
  • Nonlocal symmetries, solitary waves and cnoidal periodic waves of the
           (2[math]+[math]1)-dimensional breaking soliton equation
    • Authors: Li Zou, Shou-Fu Tian, Lian-Li Feng
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, we consider the (2[math]+[math]1)-dimensional breaking soliton equation, which describes the interaction of a Riemann wave propagating along the y-axis with a long wave along the x-axis. By virtue of the truncated Painlevé expansion method, we obtain the nonlocal symmetry, Bäcklund transformation and Schwarzian form of the equation. Furthermore, by using the consistent Riccati expansion (CRE), we prove that the breaking soliton equation is solvable. Based on the consistent tan-function expansion, we explicitly derive the interaction solutions between solitary waves and cnoidal periodic waves.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-24T04:14:03Z
      DOI: 10.1142/S0217984917503481
       
  • Band structures of one-dimensional buckled Arsenene nanoribbons: Strain
           and quantum size modulations
    • Authors: Yanwei Luo, Yuxiao Li, Peng Guo, Weiguang Chen, Yanan Tang, Yu Jia
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this work, we use first-principles methods to study the strain effects on the band structures of the armchair and zigzag arsenene nanoribbons (A-AsNRs and Z-AsNRs), as well as considering different ribbon widths. The results show that the band gap for each considered arsenene nanoribbons can be decreased when the size is increased. Moreover, strain can also reduce effectively the band gap of AsNRs. Interestingly, for A-AsNRs case, the indirect to direct band transition can be obtained under the tensile strain. In comparision, the direct–indirect transition only occurs under some strain ranges for zigzag AsNRs (Z-AsNRs).
      Citation: Modern Physics Letters B
      PubDate: 2017-10-20T07:44:20Z
      DOI: 10.1142/S0217984917503419
       
  • Effects of chemical composition and mean coordination number on glass
           transitions in Ge–Sb–Se glasses
    • Authors: Wen-Hou Wei
      Abstract: Modern Physics Letters B, Ahead of Print.
      Glass transitions in the Ge–Sb–Se glasses were investigated by means of differential scanning calorimetry (DSC) under non-isothermal conditions. The glass transition temperature [math], activation energy of glass transition [math], and fragility index as functions of the mean coordination number (MCN) and atomic percent of Ge were examined. The maximum value of [math] in each group of the glasses occurred at the chemically stoichiometric composition, suggesting a glass transition threshold. The [math] and fragility index were calculated from the heating rate dependence of [math]. Both [math] and fragility index show the minima at MCN = 2.4 which can be attributed to the structural phase transition of a covalently glassy network at MCN = 2.4. The analysis of the experimental results suggests that both the chemical composition and MCN have significant effects on the glass transitions in Ge–Sb–Se glasses.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-20T07:44:19Z
      DOI: 10.1142/S0217984917503420
       
  • Nonsingular localized wave solutions for the nonlocal Davey–Stewartson I
           equation with zero background
    • Authors: Tao Xu, Min Li, Yehui Huang, Yang Chen, Chen Yu
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, via the elementary Darboux transformation, we study the nonsingular localized wave solutions of the partially parity-time [math] symmetric nonlocal Davey–Stewartson I equation with zero background. In addition to the common dromion and line-soliton solutions, we obtain some new localized wave solutions including the periodical-soliton, quasi-line-soliton and defected-line-soliton solutions. Meanwhile, we give the exact nonsingular parametric conditions for the derived solutions to display different localized wave structures. In addition, we discuss the dynamical behavior of the obtained nonlinear localized wave solutions with graphical illustration.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-19T09:23:52Z
      DOI: 10.1142/S0217984917503389
       
  • Conductivity of impurity graphene nanoribbons and gate electric field
    • Authors: Natalia Konobeeva, Mikhail Belonenko
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, we investigate the influence of a gate electric field on the tunneling current for the contact of impurity graphene nanoribbon with a metal or quantum dots. Based on the Hamiltonian for graphene in the tight-binding approximation, the density of states is calculated, which allows us to obtain a tunneling current. We analyze the effect of the field magnitude on the detecting possibility of an impurity in the graphene nanoribbon. A sufficient change of current–voltage characteristic (CVC) of the contact is observed, with an increase in the constant electric field applied parallel to the nanoribbon plane.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-19T09:23:52Z
      DOI: 10.1142/S0217984917503407
       
  • Low-temperature sintered Li2(Mn[math]Ti[math])O3
           microwave dielectric ceramics with adjustable [math]
    • Authors: Cheng Liu, Huaiwu Zhang, Hua Su, Jie Li, Yulong Liao, Lijun Jia, Yuanxun Li
      Abstract: Modern Physics Letters B, Ahead of Print.
      B2O3–Bi2O3–SiO2–ZnO (BBSZ) glass-modified Li2(Mn[math]Ti[math])O3 ceramics were fabricated via a solid-state reaction route. Pure phase and dense crystal morphology were obtained at 900[math]C. Suitable amount of Mn[math]-ion substitution could adjust the [math] value of the Li2(Mn[math]Ti[math])O3 system to near zero. Among all of the Li2(Mn[math]Ti[math])O3 samples, the sample with x = 0.9 (marked as BL9 in this paper) possessed good microwave dielectric properties: [math] = 18, Q × f = 14,056 GHz (9.58 GHz) and [math] = (+)2.43 ppm/[math]C. It is suggested that the Li2(Mn[math]Ti[math])O3 ceramic with BBSZ glass is a suitable low-temperature co-fired ceramic (LTCC) candidate for microwave applications.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-19T09:23:51Z
      DOI: 10.1142/S0217984917503390
       
  • Microscopic analysis of homogeneous electron gas by
           considering dipole–dipole interaction
    • Authors: G. H. Bordbar, F. Pouresmaeeli
      Abstract: Modern Physics Letters B, Ahead of Print.
      Implying perturbation theory, the impact of the dipole–dipole interaction (DDI) on the thermodynamic properties of a homogeneous electron gas at zero temperature is investigated. Through the second quantization formalism, the analytic expressions for the ground state energy and the DDI energy are obtained. In this paper, the DDI energy has similarities with the previous works done by others. We show that its general behavior depends on density and the total angular momentum. Especially, it is found that the DDI energy has a highly state-dependent behavior. With the growth of density, the magnitude of DDI energy, which is found to be the summation of all energy contributions of the states with even and odd total angular momenta, grows linearly. It is also found that for the states with even and odd total angular momenta, the DDI energy contributions are corresponding to the positive and negative values, respectively. In particular, an increase of total angular momentum leads to decline in the magnitude of energy contribution. Therefore, the dipole–dipole interaction reveals distinct characteristics in comparison with central-like interactions.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-19T02:55:54Z
      DOI: 10.1142/S0217984917503341
       
  • Adsorption properties of chloroform molecule on graphene: Experimental and
           first-principles calculations
    • Authors: Y. L. Tian, H. L. Hua, W. W. Yue, M. N. Chen, G. C. Hu, J. F. Ren, X. B. Yuan
      Abstract: Modern Physics Letters B, Ahead of Print.
      Adsorption properties of chloroform molecule (CHCl3) on graphene surface are studied experimentally and theoretically. Based on the density functional theory (DFT) calculations, effects of different adsorption configurations and different adsorption distances on the system’s conductivity properties are discussed, and the comparisons with the experimental results are made. It is found that band gap appears when the adsorption distance is 1.0 Å, which is about 0.32 eV near the Fermi level. However, the band gap is nearly zero when the adsorption distance is increased to 1.5 Å, so the conductivity of the system will be increased with the increasing of the adsorption distances. The density of states, the adsorption energy and the effective masses are also calculated and the analyses are consistent with the experimental results. Our results reveal that graphene could be used to build sensors or as a catalyst for molecular adsorption.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-19T02:55:54Z
      DOI: 10.1142/S0217984917503353
       
  • Protecting quantum coherence in an open system under non-inertial frames
    • Authors: Long-Fei Wang, Ming-Ming Du, Liu Ye
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, we explore the dynamics and protection of quantum coherence in an open system under non-inertial frames by weak measurement and reversal, and design four strategies to protect the quantum coherence of an initial two-qubit entangled state, when the systems suffer from amplitude damping (AD) channel and one subsystem is under non-inertial frames. In practice, there is no strict inertial frames, decoherence and degradation of the quantum coherence caused by the Unruh effect form acceleration will have a significant interaction, therefore it is important to find some means to protect quantum coherence under non-inertial frames.
      Citation: Modern Physics Letters B
      PubDate: 2017-10-19T02:55:54Z
      DOI: 10.1142/S0217984917503365
       
  • 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
       
  • 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
       
  • 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
       
  • 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
       
  • 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
       
 
 
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