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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]
  • Effects of vacuum annealing treatment on microstructures
           and residual stress of AlSi10Mg parts produced
           by selective laser melting process
    • Authors: Tian Chen, Linzhi Wang, Sheng Tan
      Abstract: Modern Physics Letters B, Volume 30, Issue 19, 20 July 2016.
      Selective laser melting (SLM)-fabricated AlSi10Mg parts were heat-treated under vacuum to eliminate the residual stress. Microstructure evolutions and tensile properties of the SLM-fabricated parts before and after vacuum annealing treatment were studied. The results show that the crystalline structure of SLM-fabricated AlSi10Mg part was not modified after the vacuum annealing treatment. Additionally, the grain refinement had occurred after the vacuum annealing treatment. Moreover, with increasing of the vacuum annealing time, the second phase increased and transformed to spheroidization and coarsening. The SLM-produced parts after vacuum annealing at 300[math]C for 2 h had the maximum ultimate tensile strength (UTS), yield strength (YS) and elongation, while the elastic modulus decreased significantly. In addition, the tensile residual stress was found in the as-fabricated AlSi10Mg samples by the microindentation method.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-21T07:47:16Z
      DOI: 10.1142/S0217984916502559
       
  • Tunneling behavior of ultracold atoms in optical traps
    • Authors: Binglu Wang, Yanhua Ma, Man Shen, Hong Li
      Abstract: Modern Physics Letters B, Ahead of Print.
      We investigate the tunneling of ultracold atoms in optical traps by using the path-integral method. We obtain the decay rate for tunneling out of a single-well and discuss how the rate is affected by the level splitting caused by the presence of a second adjacent well. Our calculations show that the transition through the potential barrier can be divided into three regions: the quantum tunneling region, the thermally assisted region and the thermal activation region. The tunneling process is found to be a second-order transition. We also show that level splitting due to tunneling can increase the tunneling rate.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-25T03:17:23Z
      DOI: 10.1142/S0217984916502456
       
  • Tri-integrable coupling of the Kaup-Newell soliton hierarchy and Liouville
           integrability
    • Authors: Shuimeng Yu, Yujian Ye, Jun Zhang, Junquan Song
      Abstract: Modern Physics Letters B, Ahead of Print.
      Based on a matrix Lie algebra consisting of [math] block matrices, new tri-integrable coupling of the Kaup–Newell soliton hierarchy is constructed. Then, the bi-Hamiltonian structure which leads to Liouville integrability of this coupling is furnished by the variational identity.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-25T03:17:20Z
      DOI: 10.1142/S0217984916502778
       
  • Dynamics of water trimer in femtosecond laser pulses
    • Authors: Zhiping Wang, Fengshou Zhang, Xuefeng Xu, Yanbiao Wang, Chaoyi Qian
      Abstract: Modern Physics Letters B, Ahead of Print.
      With the help of the time-dependent local-density approximation (TDLDA) coupled non-adiabatically to molecular dynamics (MD), we studied both the static properties and irradiation dynamics of water trimer subject to the short and intense femtosecond laser field. It is shown that the optimized geometry and the optical absorption strength of the water trimer accord well with results in literature. Three typical possible irradiated scenarios of water trimer which are “normal oscillation”, “dissociation and formation” and “pure OH dissociation” are exhibited by investigating the ionization and the level depletion related to electrons as well as the OH bonds, proton-transfer, the intermolecular distance and the kinetic energy connected with ions. In three scenarios, the behaviors of water trimer can be attributed to the sequential combination of responses of the electrons emission, the proton-transfer, OH vibration and rotation, OH dissociation and hydroxyl formation, respectively. The relevant time scales of the first proton-transfer and OH dissociation are identified as 13 fs and 10–20 fs, respectively. The study of kinetic energies of ions show that the kinetic energies of the remaining ions are all below 4.5 eV and outgoing hydrogen ions carry a kinetic energy about 5–12 eV. Furthermore, it is found that in the tunneling ionization situations the depletion is fairly shared between the various levels except the most deep occupied electronic level while in the multiphotonic ionization case the electron loss comes from all single-electron levels and the HOMO level contributes the most.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-25T03:17:19Z
      DOI: 10.1142/S0217984916502729
       
  • Soliton solutions for a (3 + 1)-dimensional modified Korteweg–de
           Vries–Zakharov–Kuznetsov equation in a plasma
    • Authors: Yan Sun, Bo Tian, Hui-Ling Zhen, Xiao-Yu Wu, Xi-Yang Xie
      Abstract: Modern Physics Letters B, Ahead of Print.
      Under investigation in this paper is a (3 + 1)-dimensional modified Korteweg–de Vries–Zakharov–Kuznetsov (KdV-ZK) equation, which describes the nonlinear behaviors of ion-acoustic waves in a magnetized plasma where the cooler ions are treated as a fluid with adiabatic pressure and the hot isothermal electrons are described by a Boltzmann distribution. With the Hirota method and symbolic computation, we obtain the one-, two- and three-soliton solutions for such an equation. We graphically study the solitons related with the coefficient of the cubic nonlinearity [math]. Amplitude of the one soliton increases with increasing [math], but the width of one soliton keeps unchanged as [math] increases. The two solitons and three solitons are parallel, and the amplitudes of the solitons increase with increasing [math], but the widths of the solitons are unchanged. It is shown that the interactions between the two solitons and among the three solitons are elastic.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-25T03:17:18Z
      DOI: 10.1142/S0217984916502134
       
  • Carrier leakage effect on efficiency droop in InGaN/GaN
           light-emitting diodes
    • Authors: Yang Huang, Zhiqiang Liu, Xiaoyan Yi, Yao Guo, Shaoteng Wu, Guodong Yuan, Junxi Wang, Guohong Wang, Jinmin Li
      Abstract: Modern Physics Letters B, Ahead of Print.
      A new model for efficiency droop in InGaN/GaN light-emitting diodes (LEDs) is proposed, where the primary nonradiative recombination mechanisms, including Shockley–Read–Hall (SRH), Auger and carrier leakage, are considered. A room-temperature external quantum efficiency (EQE) measurement was performed on our designed samples and analyzed by the new model. Owing to advantages over the common “[math] model”, the “new model” is able to effectively extract recombination coefficients and calculate the leakage currents of the hole and electron. From this new model, we also found that hole leakage is distinct at low injection, while it disappears at high injection, which is contributed to the weak blocking effect of electron in quantum wells (QWs) at low injection.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-25T03:17:16Z
      DOI: 10.1142/S0217984916502213
       
  • Vertical self-organization of [math] nanocolumn multilayers grown on
           Ge(001) substrates
    • Authors: Thi Giang Le, Minh Tuan Dau
      Abstract: Modern Physics Letters B, Ahead of Print.
      High-resolution transmission electron microscopy (HR-TEM) has been used to investigate the structural properties of GeMn/Ge nanocolumns multilayer samples grown on Ge(001) substrates by means of molecular beam epitaxy (MBE) system. Four bilayers with the spacer thickness in the range between 6 nm and 15 nm and 10 periods of bilayers of Ge[math]Mn[math]/Ge nanocolumn are presented. A simplified 2D model based on the theory of elastic constant interactions has been used to provide reasonable explanations to the vertical self-organization of GeMn nanocolumns in multilayers.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-20T08:59:40Z
      DOI: 10.1142/S0217984916502699
       
  • The Born–Mayer–Huggins potential in high temperature
           superconductors
    • Authors: Hempal Singh, Anu Singh, B. D. Indu
      Abstract: Modern Physics Letters B, Ahead of Print.
      The Born–Mayer–Huggins potential which has been found the best suitable potential to study the YBa2Cu3O[math] type high temperature superconductors is revisited in a new framework. A deeper insight in it reveals that the Born–Mayer parameters for different interactions in high temperature superconductor are not simple quantities but several thermodynamic and spatial functions enter the problem. Based on the new theory, the expressions for pressure, bulk modulus and Born–Mayer parameters have been derived and it is established that these quantities depend upon Gruneisen parameter which is the measure of the strength of anharmonic effects in high temperature superconductors. This theory has been applied to a specific model YBa2Cu3O[math] crystal for the purpose of numerical estimates to justify the new results.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-20T08:59:37Z
      DOI: 10.1142/S0217984916502833
       
  • A novel application classification and its impact on network performance
    • Authors: Shuo Zhang, Ning Huang, Xiaolei Sun, Yue Zhang
      Abstract: Modern Physics Letters B, Ahead of Print.
      Network traffic is believed to have a significant impact on network performance and is the result of the application operation on networks. Majority of current network performance analysis are based on the premise that the traffic transmission is through the shortest path, which is too simple to reflect a real traffic process. The real traffic process is related to the network application process characteristics, involving the realistic user behavior. In this paper, first, an application can be divided into the following three categories according to realistic application process characteristics: random application, customized application and routine application. Then, numerical simulations are carried out to analyze the effect of different applications on the network performance. The main results show that (i) network efficiency for the BA scale-free network is less than the ER random network when similar single application is loaded on the network; (ii) customized application has the greatest effect on the network efficiency when mixed multiple applications are loaded on BA network.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-20T08:59:23Z
      DOI: 10.1142/S021798491650278X
       
  • Application of Gaussian moment method to a gene autoregulation model of
           rational vector field
    • Authors: Yan-Mei Kang, Xi Chen
      Abstract: Modern Physics Letters B, Ahead of Print.
      We take a lambda expression autoregulation model driven by multiplicative and additive noises as example to extend the Gaussian moment method from nonlinear stochastic systems of polynomial vector field to noisy biochemical systems of rational polynomial vector field. As a direct application of the extended method, we also disclose the phenomenon of stochastic resonance. It is found that the transcription rate can inhibit the stochastic resonant effect, but the degradation rate may enhance the phenomenon. These observations should be helpful in understanding the functional role of noise in gene autoregulation.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-20T08:59:01Z
      DOI: 10.1142/S021798491650264X
       
  • Optimization effect of annealing treatment on oxygen-implanted Nd:CNGG
           waveguides
    • Authors: Chun-Xiao Liu, Li-Li Fu, Liang-Liang Cheng, Xu-Feng Zhu, She-Bao Lin, Rui-Lin Zheng, Zhi-Guang Zhou, Hai-Tao Guo, Wei-Nan Li, Wei Wei
      Abstract: Modern Physics Letters B, Ahead of Print.
      Neodymium-doped calcium niobium gallium garnet (Nd:CNGG) waveguide operated at 632.8 nm is demonstrated by the 3.0-MeV oxygen-ion implantation with a fluence of [math] ions/cm2. The annealing treatment at 300[math]C for 45 min is carried out to optimize the waveguide quality. The dark-mode spectra are measured by the [math]-line technique. The refractive index profiles are calculated from the effective refractive indices of the waveguide modes. The near-field intensity distributions are simulated based on the reconstructed refractive index profiles. The annealing treatment process could effectively remove unwanted defects and optimize the waveguide quality. The optical properties of the annealed waveguide are better than that of the as-implanted waveguide.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-20T08:58:49Z
      DOI: 10.1142/S0217984916502614
       
  • Microstructure evolution and phase transformation in thermally cycled
           Ni–Ti–Hf film
    • Authors: Chunwang Zhao, Xiaokai Meng
      Abstract: Modern Physics Letters B, Ahead of Print.
      A Ni[math]Ti[math]Hf[math] film was synthesized through magnetron sputtering followed by crystallization and thermal cycling. Microstructure evolution and phase transformation were investigated through transmission electron microscopy and differential scanning calorimetry. Crystallization can be partially completed when heating temperature was increased to 540[math]C, which is higher than the usually thought crystallization temperature of 503.6[math]C. After crystallization occurs, the film consists of large Ni–Ti–Hf grains and small granular particles of (Ti,[math]Hf)2Ni precipitates dispersed in an amorphous pattern. As the number of thermal cycles increases, crystallization is completed gradually and martensite transformation temperature decreases gradually.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-20T08:58:31Z
      DOI: 10.1142/S0217984916502638
       
  • Excess conductivity analysis in [math] added with [math] nanoparticles and
           nanowires: Comparative study
    • Authors: A. L. Al-Otaibi, M. A. Almessiere, M. Ben Salem, F. Ben Azzouz
      Abstract: Modern Physics Letters B, Ahead of Print.
      The effect of nanosized silicon oxide nanoparticles (denoted NP-SiO2) and nanowires (denoted NW-SiO2) additions during the final processing stage on electrical fluctuation conductivity of polycrystalline YBa2Cu3O[math] (Y-123 for brevity) in the mean field region has been reported. Series of samples were synthesized in air using a standard solid-state reaction technique by adding nanosized entities up to 0.5 wt.%. Phases, microstructure and superconductivity properties have been systematically investigated using X-ray diffraction (XRD), transmission electron microscopy (TEM) and electrical measurements. TEM investigations show the presence of inhomogeneities embedded in the superconducting matrix along with the presence of columnar defects in the case of SiO2 nanoparticles added samples, however nanowires tend to agglomerate by entangling with each other in the intergrain regions. The fluctuation conductivity was analyzed as a function of reduced temperature using the Aslamazov–Larkin model. Using the Lawrence–Doniach equations, the Ginzburg–Landau (GL) number (NG) and equations, the coherence length, the effective layer thickness, the lower critical field [math], the upper critical field [math] and the critical current density [math] were estimated. It was found that the addition of an optimum concentration of SiO2 nanomaterials, that depends on the shape, effectively controlled the microstructure, the grains coupling and hence improved the physical properties of Y-123 compound.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-20T08:58:25Z
      DOI: 10.1142/S0217984916502420
       
  • Effects of scale-free avalanche walks on anomalous diffusions
    • Authors: Hyun-Joo Kim
      Abstract: Modern Physics Letters B, Ahead of Print.
      Effects of scale-free avalanche walks on anomalous diffusions have been studied by introducing simple non-Markovian walk models. The scale-free avalanche walk is realized as a walker goes to one direction consistently in a time interval, the distribution of which follows a power-law. And it is applied to the memory models, in which the entire history of a walk process is memorized or the memory for the latest step is enhanced with time. The power-law avalanche walk with memory effects strengthens the persistence between steps and thus makes the Hurst exponent be larger than the cases without avalanche walks, while does not affect the anti-persistent nature.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-20T08:58:23Z
      DOI: 10.1142/S0217984916502742
       
  • Graphene in turbine blades
    • Authors: D. K. Das, P. K. Swain, S. Sahoo
      Abstract: Modern Physics Letters B, Ahead of Print.
      Graphene, the two-dimensional (2D) nanomaterial, draws interest of several researchers due to its many superior properties. It has extensive applications in numerous fields. A turbine is a hydraulic machine which extracts energy from a fluid and converts it into useful work. Recently, Gudukeya and Madanhire have tried to increase the efficiency of Pelton turbine. Beucher et al. have also tried the same by reducing friction between fluid and turbine blades. In this paper, we study the advantages of using graphene as a coating on Pelton turbine blades. It is found that the efficiency of turbines increases, running and maintenance cost is reduced with more power output. By the application of graphene in pipes, cavitation will be reduced, durability of pipes will increase, operation and maintenance cost of water power plants will be less.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-20T08:58:21Z
      DOI: 10.1142/S0217984916502626
       
  • Monte Carlo simulation of the influence of pressure and
           target–substrate distance on the sputtering process for metal and
            semiconductor layers
    • Authors: Abdelkader Bouazza, Abderrahmane Settaouti
      Abstract: Modern Physics Letters B, Ahead of Print.
      The energy and the number of particles arriving at the substrate during physical vapor deposition (PVD) are in close relation with divers parameters. In this work, we present the influence of the distance between the target and substrate and the gas pressure in the sputtering process of deposited layers of metals (Cu, Al and Ag) and semiconductors (Ge, Te and Si) for substrate diameter of 40 cm and target diameter of 5 cm. The nascent sputter flux, the flux of the atoms and their energy arriving at the substrate have been simulated by Monte Carlo codes. A good agreement between previous works of other groups and our simulations for sputter pressures (0.3–1 Pa) and target–substrate distances (8–20 cm) is obtained.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-18T08:21:18Z
      DOI: 10.1142/S0217984916502535
       
  • Design of layered structure for thermal cloak with complex shape
    • Authors: Xuebo Yuan, Guochang Lin, Youshan Wang
      Abstract: Modern Physics Letters B, Ahead of Print.
      Thermal cloaks have potential applications in thermal protection and sensing, and those cloaks with complex shapes are much more efficient in application. Layered discretization is a valid way to realize thermal cloaks designed through spatial transformation which are usually nonhomogeneous and anisotropic. However, previous studies are limited to two-dimensional cylindrical ones. Based on the theories of spatial transformation and effective medium, a four-step design method for layered structure of thermal cloak with complex shape is proposed. It is expected to realize the designed layered structure by utilizing the existing regular materials. According to the numerical simulations, the thermal cloaking performances of layered structures are good and close to that of the perfect thermal cloaks. This study has provided an effective way for realizing thermal cloak with complex shape.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-18T08:21:18Z
      DOI: 10.1142/S0217984916502560
       
  • Electrical performance of alumina films made in EB evaporation
    • Authors: Li-Jun He, Li-Yan Wang, Wei-Zhong Chen, Xing-Zhao Liu
      Abstract: Modern Physics Letters B, Ahead of Print.
      Alumina thin films deposited by electron beam (EB) evaporation are investigated with regard to their performance in high-temperature electrical insulators. The most important application is high-temperature sensors. The leakage behavior of EB-evaporated alumina thin films is investigated by analyzing the temperature dependence of the I–V characteristics of alumina thin films deposited on Pt/n-Si(100) substrates. The temperature is extending in the range from 300 K up to 1273 K. The results show that ln(J) increases linearly with the increasing electric field at high-temperature range, the trap depth of [math] is 280 meV, the conductivity increases with the increasing temperature, while the resistivity decreases with the increasing temperature.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-18T08:21:17Z
      DOI: 10.1142/S0217984916502602
       
  • An effective and efficient approach to p-type AlN by Be2:O codoping from
           first-principles calculations
    • Authors: Meng Zhao, Wenjun Wang, Jun Wang, Junwei Yang, Weijie Hu, Liwei Guo, Xiaolong Chen
      Abstract: Modern Physics Letters B, Ahead of Print.
      Various Be:O-codoped AlN crystals have been investigated via first-principles calculations to evaluate the role of the different combinations in effectively and efficiently inducing p-type carriers. It is found that the O atom is favored to bond with two Be atoms. The formed Be2:O complexes decrease the acceptor ionization energy to 0.11 eV, which is 0.16 eV lower than that of an isolated Be in AlN, implying that the hole concentration could probably be increased by 2–3 orders of magnitude. The electronic structure of Be2:O-codoped AlN shows that the lower ionization energy can be attributed to the interaction between Be and O. The Be–O complexes, despite failing to induce p-type carriers for the mutual compensation of Be and O, introduce new occupied states on the valence-band maximum (VBM) and hence the energy needed for the transition of electrons to the acceptor level is reduced. Thus, the Be2:O codoping method is expected to be an effective and efficient approach to realizing p-type AlN.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-18T08:21:12Z
      DOI: 10.1142/S0217984916502572
       
  • A near-transparent 90[math] polarization rotator with an array of L-shaped
           holes inside a glass cube
    • Authors: Yan-Lin Liao, Yan Zhao, He-Ping Lu
      Abstract: Modern Physics Letters B, Ahead of Print.
      We report a near-transparent 90[math] polarization rotator by using a single-layer microstructure. The co-polarization light has been suppressed by using destructive interference. At the same time, the transmission of cross-polarization light has been improved with inference effect between surface plasmon polaritons (SPPs) and localized surface plasmons (LSPs). This efficient polarization rotation mechanism may be very useful in designing polarization rotators.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-18T08:21:11Z
      DOI: 10.1142/S0217984916502596
       
  • The fermionic covariant prolongation structure of the super generalized
           Hirota equation
    • Authors: Zhaowen Yan, Shaokui Yao, Chunhong Zhang, Gegenhasi
      Abstract: Modern Physics Letters B, Ahead of Print.
      The integrability of a super generalized Hirota equation (GHE) is investigated by means of the fermionic covariant prolongation structure theory. We construct the [math] prolongation structure for the super GHE and derive the corresponding Lax representation and the Bäcklund transformation. In addition, a solution of the super integrable equation is presented.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-14T09:18:19Z
      DOI: 10.1142/S0217984916502511
       
  • Influence of sintering temperature on structural, morphological and
           magnetic properties of barium hexaferrite nanoparticles
    • Authors: M. Burhan Shafqat, Omer Arif, Shahid Atiq, Murtaza Saleem, Shahid M. Ramay, Asif Mahmood, Shahzad Naseem
      Abstract: Modern Physics Letters B, Ahead of Print.
      Barium hexaferrite nanoparticles are attractive for modern data storage and microwave devices due to their unique properties. Single phase synthesis of barium hexaferrite using sol–gel auto-combustion route was optimized by varying sintering temperature and time. X-ray diffraction confirmed single phase hexagonal crystal structure of the sample sintered at 1100[math]C for 2 h. Crystallite size, as determined using Scherrer’s formula, was increased with the increase in sintering temperature while the porosity remained nearly unchanged. Field emission scanning electron microscope (FE-SEM) revealed that grain size was increased from nanometers to micrometers by rising the sintering temperature and the shape of particles was platelet-like hexagonal at 900[math]C. Vibrating sample magnetometer (VSM) exhibited that saturation magnetization and coercivity increased with the increase of sintering temperature. Maximum saturation magnetization and coercivity values were 36.80 emu/g and 5365 Oe, respectively, for the sample sintered at 1100[math]C for 2 h.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-14T09:18:12Z
      DOI: 10.1142/S0217984916502547
       
  • A new three-tier architecture design for multi-sphere neutron spectrometer
           with the FLUKA code
    • Authors: Hong Huang, Jian-Bo Yang, Xian-Guo Tuo, Zhi Liu, Qi-Biao Wang, Xu Wang
      Abstract: Modern Physics Letters B, Ahead of Print.
      The current commercially, available Bonner sphere neutron spectrometer (BSS) has high sensitivity to neutrons below 20 MeV, which causes it to be poorly placed to measure neutrons ranging from a few MeV to 100 MeV. The paper added moderator layers and the auxiliary material layer upon 3He proportional counters with FLUKA code, with a view to improve. The results showed that the responsive peaks to neutrons below 20 MeV gradually shift to higher energy region and decrease slightly with the increasing moderator thickness. On the contrary, the response for neutrons above 20 MeV was always very low until we embed auxiliary materials such as copper (Cu), lead (Pb), tungsten (W) into moderator layers. This paper chose the most suitable auxiliary material Pb to design a three-tier architecture multi-sphere neutron spectrometer (NBSS). Through calculating and comparing, the NBSS was advantageous in terms of response for 5–100 MeV and the highest response was 35.2 times the response of polyethylene (PE) ball with the same PE thickness.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-14T09:18:11Z
      DOI: 10.1142/S0217984916502353
       
  • Liquid–solid transition of water confined in nanoporous titanium
           dioxide
    • Authors: Xin Gao, Qiang Wang, Gang Sun, Chenxi Li, Lin Hu
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this work, we performed differential scanning calorimetry (DSC) experiments to investigate the phase transition temperature and the molar enthalpy of the absorbed water confined in porous titanium dioxide. The porous titanium dioxide with three different pore size distribution and different filling fraction of the absorbed water were examined. We found that both the pore size of the examined samples and the filling fraction of the absorbed water affected the water’s phase transition temperature and its molar enthalpy.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-12T09:49:47Z
      DOI: 10.1142/S021798491650250X
       
  • Superconductivity in a one-dimensional correlated quantum system
    • Authors: Hanqin Ding, Jun Zhang
      Abstract: Modern Physics Letters B, Ahead of Print.
      We construct a one-dimensional (1D) theoretical model to clarify the occurrence of superconductivity. The weak-coupling (WC) theory allows a determination of the phase diagram. The constrained hopping induces additional two-body and three-body interactions. At half-filling, the three-body interaction is responsible for the triplet superconducting (TS) correlation. Away from half-filling, the two-body interaction works, favoring the singlet superconducting (SS) correlation. The results are expected to provide an insignificant insight into the superconductivity mechanism.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-12T09:49:45Z
      DOI: 10.1142/S0217984916502316
       
  • DFT simulation on the temperature-dependent electronic transition of V (Nb
           or Ta) substituted NiMn2O4
    • Authors: Hai-Long Li, Liang Bian, Ai-Ming Chang, Ji-Kang Jian, Wen-Ping Hou, Lei Gao, Xiao-Yan Zhang, Lei Wang, Wei Ren, Mian-Xin Song, Fa-Qin Dong
      Abstract: Modern Physics Letters B, Ahead of Print.
      Previously, we reported that the [math]–[math] (Mn-[math]–O-[math]) orbital hybridization induces Mn valence change (Mn[math]Mn[math]) in the octahedron. The electron transfer mechanism can be controlled by modifying the Mn-[math] orbital in the octahedron. Here, we used the density functional theory (DFT) with generalized gradient approximation (GGA) and two-dimensional correlation analysis (2D-CA) techniques to calculate the electron transfer mechanism of the V (Nb or Ta) substituted NiMn2O4 (NMO) in the temperature range of 50–1500 K. The results show that the heat accumulation accelerates the O-[math] orbital splitting, inducing charge disproportionation. The V-[math] substituted Mn increases the intensity and of the partial density of state (PDOS) at conduction band (1–3 eV), this enhances the V-[math]–O-[math] [math]–[math] [math] orbital. The Nb-[math]/Ta-[math] substituted Mn reduces the intensity of the PDOS at conduction band (1–5 eV), this weakens the Nb-[math]/Ta-[math]–O-[math] [math]–[math] [math] orbital. This study effectively analyzes the microscopic changes of the electron transfer caused by the heat accumulation, provides a theoretical basis for the design of NMO-based negative temperature coefficient (NTC) thermistors.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-12T09:49:39Z
      DOI: 10.1142/S0217984916502481
       
  • The phononic crystals: An unending quest for tailoring acoustics
    • Authors: Manvir S. Kushwaha
      Abstract: Modern Physics Letters B, Ahead of Print.
      Periodicity (in time or space) is a part and parcel of every living being: one can see, hear and feel it. Everyday examples are locomotion, respiration and heart beat. The reinforced N-dimensional periodicity over two or more crystalline solids results in the so-called phononic band gap crystals. These can have dramatic consequences on the propagation of phonons, vibrations and sound. The fundamental physics of cleverly fabricated phononic crystals can offer a systematic route to realize the Anderson localization of sound and vibrations. As to the applications, the phononic crystals are envisaged to find ways in the architecture, acoustic waveguides, designing transducers, elastic/acoustic filters, noise control, ultrasonics, medical imaging and acoustic cloaking, to mention a few. This review focuses on the brief sketch of the progress made in the field that seems to have prospered even more than was originally imagined in the early nineties.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-12T09:49:37Z
      DOI: 10.1142/S0217984916300040
       
  • First-principles study on the electronic and magnetic properties of the
           [math]
    • Authors: Zhu-Hua Yin, Jian-Min Zhang, Ke-Wei Xu
      Abstract: Modern Physics Letters B, Ahead of Print.
      The geometrical, electronic and magnetic properties of the Zn[math]Mo[math]M (M[math]=[math]S, Se and Te) have been studied by spin-polarized first-principles calculation. The optimized lattice constants of 5.535, 5.836 and 6.274 Å for M[math]=[math]S, Se and Te are related to the atomic radius of 1.09, 1.22 and 1.42 Å for S, Se and Te atoms, respectively. The Zn[math]Mo[math]M are magnetic half-metallic (HM) with the spin-down conventional band gaps of 2.899, 2.126 and 1.840 eV, while the HM band gaps of 0.393, 0.016 and 0.294 eV for M[math]=[math]S, Se and Te, respectively. At the Fermi level, the less than half-filled Mo-[math] orbital hybridizated with the less M-[math] orbital contributes only spin-up channel leading Zn[math]Mo[math]M an HM ferromagnetism. The tetrahedral crystal field formed by adjacent three Zn atoms and one M atom splits the spin-up channel (majority spin) of Mo-[math] orbital into three-fold degenerate [math] states at the Fermi level and double degenerate [math] [math] states below the Fermi level. The exchange splitting energies of the Zn[math]Mo[math]M are −2.611, −2.231 and −1.717 eV for M[math]=[math]S, Se and Te, respectively. The results provide an useful theoretical guidance for Zn[math]Mo[math]M applications in spintronic devices.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-12T09:49:34Z
      DOI: 10.1142/S0217984916502493
       
  • Chaos control of a Bose–Einstein condensate in a moving optical
           lattice
    • Authors: Zhiying Zhang, Xiuqin Feng, Zhihai Yao
      Abstract: Modern Physics Letters B, Ahead of Print.
      Chaos control of a Bose–Einstein condensate (BEC) loaded into a moving optical lattice with attractive interaction is investigated on the basis of Lyapunov stability theory. Three methods are designed to control chaos in BEC. As a controller, a bias constant, periodic force, or wavelet function feedback is added to the BEC system. Numerical simulations reveal that chaotic behavior can be well controlled to achieve periodicity by regulating control parameters. Different periodic orbits are available for different control parameters only if the maximal Lyapunov exponent of the system is negative. The abundant effect of chaotic control is also demonstrated numerically. Chaos control can be realized effectively by using our proposed control strategies.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-12T02:47:38Z
      DOI: 10.1142/S0217984916502389
       
  • Hydrothermal synthesis of micrometer doping CaWO4 phosphors assisted
           by polymerization
    • Authors: Liyong Wang, Yuanyuan Han, Dan Wang, Shiqi Wang, Guoxin Lu, Danyang Liang, Xiaoyu Wang, Nana Pei, Lan Gao
      Abstract: Modern Physics Letters B, Ahead of Print.
      CaWO4 crystals were prepared by hydrothermal method assisting with phenol-formaldehyde polymer. The morphology can be controlled by polymer, and X-ray diffraction patterns results present a scheelite-type tetragonal structure, characteristic infrared active modes for O–W–O in the range from 500 cm[math] to 4000 cm[math] by Fourier transform infrared spectroscopic techniques. Raman results indicate that the crystals possess seven Raman active modes in the range from 100 cm[math] to 1000 cm[math]. A scanning electron microscopy study reveals that the particles exhibit uniform morphology. Luminescent properties were investigated by photoluminescence measurements, multicolor phosphors were obtained when Ca[math] was substituted partly by lanthanide ions.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-12T02:47:37Z
      DOI: 10.1142/S0217984916502468
       
  • Constant-coupling approximation study of spin-1 Blume–Capel model
    • Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, the equilibrium properties of spin-1 Blume–Capel model are studied by using constant-coupling approximation. The formulation is based on developed by Obokata and Oguchi method, where the dependence upon the thermodynamic variables is determined by a set of two-couple nonlinear algebraic equations. The temperature dependence of the order parameters is examined to characterize the nature (continuous or discontinuous) of the phase transitions and to obtain the metastable and unstable branches. For the system, the effect of the uniaxial anisotropy parameter to phase transitions and stable, metastable and unstable states is discussed on the simple cubic lattice with the coordination number [math] = 6.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-12T02:47:36Z
      DOI: 10.1142/S0217984916502407
       
  • Structure determination of [math] clusters via DFT
    • Authors: Yanhua Li, Congzhong Cai, Chengjun Zhao, Yonghong Gu
      Abstract: Modern Physics Letters B, Ahead of Print.
      In virtue of the particle swarm optimization (PSO) algorithm, the global minimum candidate structures with the lowest energy for [math] clusters were obtained by first-principles structural searches. The geometric structures and spin configurations of three cationic [math] clusters have been identified for the first time by comparing the experimental IR spectra with the calculated results from density functional theory by using different exchange-correlation functionals. It is found that the lowest energy structures of these clusters are of a shape of hat, boat and tower, respectively, with a ferrimagnetic arrangement of spins, and M06L functional is more suitable for [math] clusters than other ones.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-12T02:47:35Z
      DOI: 10.1142/S0217984916502390
       
  • Thermoelectric properties of bulk MoSi2 synthesized
           by solid state microwave heating
    • Authors: Yu Lan, Mianyu Xie, Ting Ouyang, Song Yue
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this research, single phase [math]-MoSi2 was prepared by solid state hybrid microwave heating within 90 min at relatively low temperature 1273 K. Such precursor powders were then ball milled and sintered by microwave heating at different temperatures. The thermoelectric (TE) properties of MoSi2 bulks were investigated in the temperature range of 300–673 K. When the sintering temperature increases from 973 K to 1273 K, the electrical resistivity decreases significantly and the Seebeck coefficients increase obviously, leading to the maximum TE powder factor of [math] Wm[math]K[math] at 673 K. These results demonstrate the feasibility of high efficient and economical synthesis of MoSi2 by microwave heating technique, with the final products having comparable TE performance in comparison to those from typical methods with long duration and energy-extensive consumption.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-08T02:46:17Z
      DOI: 10.1142/S0217984916502341
       
  • Tunable plasmon-induced transparency with graphene-sheet structure
    • Authors: Yueke Wang, Xinru Shen, Quansheng Chen
      Abstract: Modern Physics Letters B, Ahead of Print.
      We investigate theoretically and numerically the tunable plasmon-induced transparency (PIT) phenomenon in graphene-sheet system in infrared range. We show that when surface plasmon polaritons (SPPs) propagate along a monolayer graphene sheet with two detuned side-coupled resonators, the PIT-like transmission spectra of SPPs appear. Thanks to the tunable permittivity of graphene by bias voltages, the resonant wavelength of side-coupled resonators can be changed. So the transmission spectra can be tuned dynamically and the tunable PIT phenomenon is achieved. Numerical simulation by finite element method is conducted to verify our design.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-08T02:46:14Z
      DOI: 10.1142/S0217984916502328
       
  • 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
       
 
 
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