Authors:Ritu Sharma, Lalit Kumar Dusad Abstract: Modern Physics Letters B, Volume 29, Issue 30, 10 November 2015. In this paper, optical absorptions in silicon nanowires (SiNWs) arrays obtained from theoretical studies and experimental approaches have been reviewed. A brief description on the different growth techniques for SiNW arrays reported so far is presented. Comparative analysis based on major research findings has been done and the advantages of SiNW-based solar cells over thin film solar cells are presented. Furthermore, future aspects of the use of SiNWs for photovoltaic applications are discussed. Citation: Modern Physics Letters B PubDate: 2015-11-05T07:09:37Z DOI: 10.1142/S0217984915300070

Authors:Furkan Dincer, Muharrrem Karaaslan, Oguzhan Akgol, Emin Unal, Cumali Sabah Abstract: Modern Physics Letters B, Volume 29, Issue 30, 10 November 2015. We theoretically and numerically designed a perfect metamaterial absorber at microwave frequencies. The proposed design has a very simple geometry, wide band properties and provides perfect absorption for all polarization angles which is one of the most desired properties for an absorber structure to be used in the applications where the source polarization is unknown. In order to explain the absorption mechanism both numerical and theoretical analyses are carried out. Designed structure offers a perfect absorption at around 9.8 GHz. The resonance frequency does not change depending on the source wave polarization. In addition, it can be easily reconfigured for THz and infrared regimes for different applications such as sensors, defense systems and stealth technologies. Citation: Modern Physics Letters B PubDate: 2015-11-05T07:09:28Z DOI: 10.1142/S0217984915501882

Authors:Hengshan Zong, Guozhu Jia, Yang Cheng Abstract: Modern Physics Letters B, Volume 29, Issue 30, 10 November 2015. Though numerous studies demonstrate the importance of social influence in deciding individual decision-making process in networks, little has been done to explore its impact on players’ behavioral patterns in evolutionary prisoner’s dilemma games (PDGs). This study investigates how social influenced strategy updating rules may affect the final equilibrium of game dynamics. The results show that weak social influence usually inhibits cooperation, while strong social influence has a mediating effect. The impacts of network structure and the existence of rebels in social influence scenarios are also tested. The paper provides a comprehensive interpretation on social influence effects on evolutionary PDGs in networks. Citation: Modern Physics Letters B PubDate: 2015-11-05T07:08:44Z DOI: 10.1142/S0217984915501845

Authors:Win-Jin Chang, Yu-Ching Yang, Haw-Long Lee Abstract: Modern Physics Letters B, Volume 29, Issue 30, 10 November 2015. The vibration analysis of an atomic force microscope (AFM) cantilever with an arbitrary number of cracks during the nanomachining process is studied based on the modified couple stress theory. The cantilever with [math] cracks is divided into [math] segments by the cracks and a rotational spring is used to simulate each crack. An analytical expression for the vibration frequency and displacement of the cracked cantilever is derived. According to the analysis, in addition, the displacement increases with an increase in the number of cracks and crack flexibilities. For nanomachining, the displacement of the cantilever tip is related to the depth of cut. The area under the displacement-time curve implies the material removal rate. The present study is useful for the design of an AFM-based nanomachining cantilever with cracks. Citation: Modern Physics Letters B PubDate: 2015-11-05T07:08:41Z DOI: 10.1142/S0217984915501869

Authors:Zhengcheng Dong, Yanjun Fang, Meng Tian, Rong Zhang Abstract: Modern Physics Letters B, Ahead of Print. With load-based model, considering the loss of capacity on nodes, we investigate how the coupling strength (many-to-many coupled pattern) and link patterns (one-to-one coupled pattern) can affect the robustness of interdependent networks. In one-to-one coupled pattern, we take into account the properties of degree and betweenness, and adopt four kinds of inter-similarity link patterns and random link pattern. In many-to-many coupled pattern, we propose a novel method to build new networks via adding inter-links (coupled links) on the existing one-to-one coupled networks. For a full investigation on the effects, we conduct two types of attack strategies, i.e. RO-attack (randomly remove only one node) and RF-attack (randomly remove a fraction of nodes). We numerically find that inter-similarity link patterns and bigger coupling strength can effectively improve the robustness under RO-attacks and RF-attacks in some cases. Therefore, the inter-similarity link patterns can be applied during the initial period of network construction. Once the networks are completed, the robustness level can be improved via adding inter-links appropriately without changing the existing inter-links and topologies of networks. We also find that BA–BA topology is a better choice and that it is not useful to infinitely increase the capacity which is defined as the cost of networks. Citation: Modern Physics Letters B PubDate: 2015-11-17T09:33:31Z DOI: 10.1142/S0217984915502103

Authors:Bin Chen, Hanming Zhu, Yunfeng Shi, Song Yue Abstract: Modern Physics Letters B, Ahead of Print. In this study, Heusler alloy [math] has been prepared by solid state hybrid microwave heating within 40 min. X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) analyses reveal that the obtained samples are of single phase cubic structure and homogeneous. Temperature-dependence of electrical resistivity and magnetization measurements confirm the austenite to martensitic transition of the first-order nature with the absence of the exchange bias (EB), which is verified by the magnetic hysteresis loops. Compared with the samples prepared by conventional arc-melting method, the sample synthesized by fast microwave heating has lower martensitic transition temperature, smooth magnetization change in the martensitic region and disappeared EB, implying strongly suppressed antiferromagnetic (AFM) interaction. These results suggest that tuning the microstructure via different synthesis method can influence significantly the martensitic transition and magnetic interactions in the Ni–Mn–Sb system. Citation: Modern Physics Letters B PubDate: 2015-11-17T09:33:27Z DOI: 10.1142/S0217984915502115

Authors:Hao Gong, Xiao-Xia Ruan, Hou-Rong Pang, Hong-Shi Zong Abstract: Modern Physics Letters B, Ahead of Print. In this paper, taking into account the effect of the induced interaction, we calculate the energy of ultracold Fermi gases at unitarity in the framework of non-self-consistent T-matrix approximation (nTMA) above the critical temperature and compare the result with the experimental data and other theoretical calculation without induced interaction. Our calculated chemical potential is higher than the experimental data, but our calculated energy obtains a good agreement with Tokyo experiment for temperature range between [math] and [math]. Citation: Modern Physics Letters B PubDate: 2015-11-17T09:33:27Z DOI: 10.1142/S0217984915502073

Authors:M. A. Grado-Caffaro, M. Grado-Caffaro Abstract: Modern Physics Letters B, Ahead of Print. The partial pressure of oxygen during the deposition process of cadmium oxide is a crucial quantity whose influence on the electrical and optical properties of this material is really very significant (consider, for example, the experimental technique known as activated reactive evaporation). In fact, this paper is a theoretical formulation to evaluate the sensitivity changes of the aforementioned pressure of the electron drift-mobility and velocity in CdO. Indeed, as we will see later, given that the electron relaxation time depends upon the oxygen partial pressure, then the electron drift-mobility, mean free path and velocity also depend on this pressure. Relevant calculations involving the above physical quantities are carried out. Citation: Modern Physics Letters B PubDate: 2015-11-17T09:33:25Z DOI: 10.1142/S0217984915502061

Authors:Liang-Liang Zhang, Jin Huang, Cheng-Bo Duan, Wei-Zhong Wang Abstract: Modern Physics Letters B, Ahead of Print. The charge structure factor of the half-filled Hubbard superlattices with one on-site repulsive site and [math] free sites per unit cell is investigated numerically. The behaviors of charge structure reveal a kind of even–odd [math] disparity. For even [math], we always observe a commensurate charge density wave (CDW). For odd [math], we observe a commensurate–incommensurate CDW transition at a critical on-site repulsion around the particle–hole symmetric point. This transition results from the competition between the local charge correlations with odd distance and even distance. Citation: Modern Physics Letters B PubDate: 2015-11-17T09:33:24Z DOI: 10.1142/S0217984915502085

Authors:Xue-Jun Zhang, Yan-Bo Zhu, Xiang-Min Guan Abstract: Modern Physics Letters B, Ahead of Print. Interconnections between networks make the traffic condition in interconnected networks more complicated than that in an isolated network. They make the load and capacity of nodes mismatch and restrict the traffic performance accordingly. To improve the performance, in this paper, we propose a hybrid routing strategy, which distinguishes the traffic within each individual network and the traffic across multiple networks and uses different routing rules for these two types of traffic. Simulation results show that this routing strategy can achieve better traffic performance than traditional strategies when networks are coupled by a small number of interconnected links, which is the case in most of real-world interconnected networks. Therefore, the proposed hybrid routing strategy can find applications in the planning and optimization of practical interconnected networks. Citation: Modern Physics Letters B PubDate: 2015-11-17T09:33:15Z DOI: 10.1142/S0217984915502127

Authors:J. L. Nie, L. Ao, X. T. Zu Abstract: Modern Physics Letters B, Ahead of Print. In this paper, first-principles calculations based on density functional theory (DFT) have been performed to investigate the adsorption of oxygen and hydrogen on [math] and [math] surfaces covered by monolayer (ML) of [math]. The results have shown that the oxygen molecule tends to adsorb on fcc site on both surfaces at the coverage of 0.25 ML, which becomes degeneration with hcp site when the coverage increases to 1 ML. For both oxygen and hydrogen, the adsorption on [math] surface are stronger than those on [math] surface. The adsorption energy difference for oxygen on the two surfaces is [math][math]0.2 eV at the coverage of 1 ML, which increases to [math][math]0.6 eV with the coverage decreasing to 0.25 ML. The similar energy difference was also found for hydrogen adsorption. The density of states analysis have demonstrated the chemical interaction of adsorbed oxygen with both pure [math] and [math] surfaces with certain shift of [math] states to lower level compared to isolated oxygen. For hydrogen adsorption, the hybridization of [math] with [math] states were observed for both surfaces, indicating the covalent bonding component of H–Pt bond. Citation: Modern Physics Letters B PubDate: 2015-11-13T10:42:21Z DOI: 10.1142/S0217984915501997

Authors:Changmin Ma, Tingyu Liu, Qiuxiang Chang Abstract: Modern Physics Letters B, Ahead of Print. In this paper, the intrinsic point defects in ZnO crystal have been studied by the approach that integrates first-principles, thermodynamic calculations and the contributions of vibrational entropy. With temperature increasing and oxygen partial pressure decreasing, the formation energies of oxygen vacancy [math], zinc interstitial [math] and zinc anti-site [math] are decreasing, while it increases for zinc vacancy [math], oxygen interstitial [math] and oxygen anti-site [math]. They are more sensitive to temperature than oxygen partial pressure. There are two interesting phenomena. First, [math] or [math] have the lowest formation energies for whole Fermi level at special environment condition (such as at [math] K, about [math] atm or [math] K, about [math] atm) and intrinsic [math]-type doping of ZnO is possible by [math] at these special conditions. Second, [math] as donors have lowest formation energy for all Fermi level at high temperature and low oxygen partial pressure ([math] K, [math] atm). According to our analysis, the [math] could produce [math]-type doping in ZnO at these special conditions and change [math]-type ZnO to [math]-type ZnO at condition from low temperature and high oxygen partial pressure to high temperature and low oxygen partial pressure. Citation: Modern Physics Letters B PubDate: 2015-11-13T10:42:18Z DOI: 10.1142/S0217984915501948

Authors:Q. Guan, P. Yu, K. C. Chan, L. Xia Abstract: Modern Physics Letters B, Ahead of Print. [math] bulk metallic glass (BMG) exhibits good glass forming ability (GFA) and excellent magneto-caloric effect (MCE). In order to further improve the GFA and MCE of the [math] BMG, we attempted to add small amount of Fe as a replacement of Co in the BMG and obtained [math] glassy rod using a traditional suction casting method. The [math] BMG shows a better GFA and MCE than the [math] BMG. The magneto-caloric behavior of the [math] BMG was investigated by studying the field dependence of the magnetic entropy change peak and the refrigeration capacity. Citation: Modern Physics Letters B PubDate: 2015-11-13T10:42:18Z DOI: 10.1142/S0217984915501985

Authors:George Savvidy Abstract: Modern Physics Letters B, Ahead of Print. In this paper we review a recently suggested generalization of the Feynman path integral to an integral over random surfaces. The proposed action is proportional to the linear size of the random surfaces and is called gonihedric. The convergence and the properties of the partition function are analyzed. The model can also be formulated as a spin system with identical partition functions. The spin system represents a generalization of the Ising model with ferromagnetic, antiferromagnetic and quartic interactions. Higher symmetry of the model allows to construct dual spin systems in three and four dimensions. In three dimensions the transfer matrix describes the propagation of closed loops and we found its exact spectrum. It is a unique exact solution of the three-dimensional statistical spin system. In three and four dimensions, the system exhibits the second-order phase transitions. The gonihedric spin systems have exponentially degenerated vacuum states separated by the potential barriers and can be used as a storage of binary information. Citation: Modern Physics Letters B PubDate: 2015-11-13T10:42:18Z DOI: 10.1142/S0217984915502036

Authors:Mohsin Rafique, Naveed Afzal, K. M. Deen, Yong-Soo Kim Abstract: Modern Physics Letters B, Ahead of Print. This work investigates the hydrogen precipitation effects on the electrochemical behavior of Zircaloy-4 in acidic saline media. The specimens of Zircaloy-4 were hydrogen charged at 200, 400 and 600 ppm concentrations for 30 min at 400[math]C. X-ray diffraction (XRD) studies confirmed the formation of delta hydrides in the material. Scanning electron microscopy (SEM) results also indicated the presence of elongated hydrides whose density and thickness increased with the increase of hydrogen concentration in the alloy. The corrosion kinetics of the specimens were explored before and after hydrogen precipitation using potentiodynamic anodic polarization (PAP) and electrochemical impedance spectroscopy (EIS) techniques. The results showed that hydrogen precipitation shifts the corrosion potential towards more positive and thus improves the corrosion resistance of the alloy. The charge transfer resistance [math] of the alloy was found to increase with increasing hydrogen concentration. This indicates an increased polarization tendency of the Zircaloy-4 surface with a limited dissolution tendency in the presence of delta hydrides. Citation: Modern Physics Letters B PubDate: 2015-11-13T10:42:17Z DOI: 10.1142/S0217984915502000

Authors:Klemen Bohinc, Leo Lue Abstract: Modern Physics Letters B, Ahead of Print. In this paper, we study the interaction between charged macroions (surfaces) immersed in a solution of oppositely charged, rod-like counterions and point-like co-ions. The system is modeled by a field theoretic approach, which was extended to treat mixtures of rod- and point-like ions. The theory is applicable from the weak to the intermediate through to the strong coupling regimes. In the weak coupling limit, the force between the charged surfaces are only repulsive. In the intermediate coupling regime, the rod-like ions can induce attractive force between the charged surfaces. In the strong coupling limit, the inter-ionic charge correlations dominate the attractive forces at short separations between the charged surfaces. Citation: Modern Physics Letters B PubDate: 2015-11-13T10:42:17Z DOI: 10.1142/S0217984915502024

Authors:Wei Shi, Xueying Deng, Yankui Wang, Qian Li Abstract: Modern Physics Letters B, Ahead of Print. The wing rock phenomenon reduces the maneuverability and affects the flight safety of modern advanced fighters, such as the F-35, which have chined forebodies. Understanding the flow mechanism is critical to suppressing this phenomenon. In this study, experiments were conducted to reveal the motion and flow behavior over a chined forebody configuration. The tests were performed in a wind tunnel at an angle of attack of 50[math] with a Reynolds number of [math]. Reversed limit-cycle oscillation was discovered in the free-to-roll tests. The unstable rolling moment around zero roll angle in the static case suggests that the model tends to be driven away from zero roll angle. Thus, the model cannot maintain its equilibrium at zero roll angle during free-to-roll motion. The unstable rolling moment is generated by the wing vortex structure above the upward wing, which is induced by the forebody asymmetric vortices. During wing rock, the wing vortex structure appears above the upward wing at a large roll angle after crossing zero roll angle owing to a time lag in the forebody vortex position, which is conducive to the motion. The forebody asymmetric vortices are thus the key to induce and maintain the motion. Citation: Modern Physics Letters B PubDate: 2015-11-13T10:42:17Z DOI: 10.1142/S0217984915502048

Authors:Ying Liu, Guangjun Ren, Rongjian Du, Yongming Zhang, Tianbo Tan, Yaqi Wang, Jianquan Yao Abstract: Modern Physics Letters B, Ahead of Print. We present a theoretical mechanism for electric field enhancement with SERS of InAs particles of subwavelength apertures under THz excitation. The distribution of electric field confirms that there is a strong enhancement in the InAs particles at THz frequencies. The InAs with a Drude-like behavior in THz range, which is similar to metals at optical frequencies, leads to different SERS when the parameters of these two particles change. The SERS enhancement factor can reach [math] under the certain conditions. Citation: Modern Physics Letters B PubDate: 2015-11-05T08:52:43Z DOI: 10.1142/S0217984915501973

Authors:Minjie Wang, Caiwen Ma Abstract: Modern Physics Letters B, Ahead of Print. This study explored the optical spectrum evolution process using a pump-modulated light and a continuous-wave probe, launched simultaneously into a 1 km highly nonlinear fiber. A total of 70 optical spectra were obtained by each changing the wavelength spacing (0.4 nm) between the probe and pump lights. Simulation results indicated that wavelength spacing between the two beams caused a cyclical optical spectrum evolution process induced by cross-phase modulation. As input light wavelength spacing increased, the coupling between the two optical fields showed obvious attenuation in each neat, multi-peak cycle. Citation: Modern Physics Letters B PubDate: 2015-11-05T08:52:41Z DOI: 10.1142/S0217984915502590

Authors:Ye Xiao, Zaixing Huang, Lei Qiang, Jun Gao Abstract: Modern Physics Letters B, Ahead of Print. In a multivalent salt solution, a segment of DNA is modeled as an elastic rod subjected to the interfacial traction. The shooting method is used to calculate the equilibrium configurations of condensed DNA under the action of the longitudinal end-force and interfacial traction simultaneously. The results show that the shapes of DNA are mainly determined by the competition between the interfacial energy and elastic strain energy of stretching. The change of end-to-end distance with the longitudinal end-force is consistent with the worm-like chain (WLC) model. The higher the concentration is, the stronger the condensation of DNA. Citation: Modern Physics Letters B PubDate: 2015-11-05T08:52:41Z DOI: 10.1142/S0217984915501936

Authors:Y. M. Sun, W. Q. Yu, D. Long, Y. Zhang, Z. Hua Abstract: Modern Physics Letters B, Ahead of Print. [math] amorphous alloy was prepared by melt-spinning and annealed at various temperatures. The thermal property, microstructure and magnetic property were investigated by differential thermal analysis (DTA), X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). The crystallization process of [math] alloy is as follow: Amorphous [math] residual amorphous [math]-[math]-Mn type [math]-Fe solid solution. Coercivity [math] of [math] alloy changes complexly, which abruptly deteriorates at 843 K and then softens with increasing annealing temperature [math]. Citation: Modern Physics Letters B PubDate: 2015-11-05T08:52:40Z DOI: 10.1142/S0217984915501961

Authors:Sevgul Ozturk, Kivilcim Koseoglu, Metin Ozer, Bahtiyar G. Salamov Abstract: Modern Physics Letters B, Ahead of Print. The influence of pressure and [math]-radiation (1 kGy [math] doses) on the charge transport mechanism, charge trapping effects in porous zeolite surfaces and breakdown voltage [math] are discussed in atmospheric microplasmas for the first time. This is due to exposure the zeolite cathode (ZC) to [math]-radiation resulting in substantial decreases in the [math], discharge currents and conductivity due to increase in porosity of the material. Results indicated that the enhancement of plasma light intensity and electron emission from the ZC surface with the release of trapped electrons which are captured by the defect centers following [math]-irradiation. The porosity of the ZC and radiation defect centers has significant influence on the charge transport of the microstructure and optical properties of the devices manufactured on its base. Thus, we confirm that the [math] is a suitable cathode material for plasma light source, field emission displays, energy storage devices and low power gas discharge electronic devices. Citation: Modern Physics Letters B PubDate: 2015-11-05T08:52:39Z DOI: 10.1142/S021798491550195X

Authors:Ruslan V. Vovk, Georgij Ya. Khadzhai, Oleksandr V. Dobrovolskiy, Zarif F. Nazyrov, Alexander Chroneos Abstract: Modern Physics Letters B, Ahead of Print. The transverse electrical resistance of [math] single crystals is investigated in the temperature range [math] for optimally-doped [math] and oxygen-poor [math] samples. With decreasing temperature, the resistivity of the optimally-doped samples has been found to transit from the regime of scattering on phonons and defects to the regime of “semiconductor” character and, near [math], of the fluctuation conductivity. The oxygen-poor samples have been revealed to exhibit only a variable range hopping conductivity of “semiconductor” character, which near [math] transits into the fluctuation conductivity. A significant anisotropy of the residual resistivity and characteristics of the fluctuation conductivity is observed for samples of both types. Citation: Modern Physics Letters B PubDate: 2015-11-05T08:52:36Z DOI: 10.1142/S0217984915502322

Authors:Xi-Yang Xie, Bo Tian, Wen-Rong Sun, Ming Wang, Yun-Po Wang Abstract: Modern Physics Letters B, Ahead of Print. In this paper, we investigate a Bogoyavlenskii–Kadomtsev–Petviashili equation, which can be used to describe the propagation of nonlinear waves in physics, biology and electrical networks. We find that the equation is Painlevé integrable. With symbolic computation, Hirota bilinear forms, solitary waves and multi-front waves are derived. Elastic collisions between/among the two and three solitary waves are graphically discussed, where the waves maintain their shapes, amplitudes and velocities after the collision only with some phase shifts. Inelastic collisions among the multi-front waves are discussed, where the front waves coalesce into one larger front wave in their collision region. Citation: Modern Physics Letters B PubDate: 2015-11-05T08:52:35Z DOI: 10.1142/S0217984915501924

Authors:Bin Guo, Liqing Yang, Weijie Hu, Wenlong Li, Haojing Wang Abstract: Modern Physics Letters B, Ahead of Print. Far-infrared functional nanocomposites were prepared by the co-precipitation method using natural tourmaline [math], where [math] is [math], [math], [math], or vacancy; [math] is [math], [math], [math], [math], [math], [math], [math], [math], or [math]; [math] is [math], [math], [math], or [math]; [math] is [math], [math]; and [math] is [math], [math], or [math] powders, ammonium cerium(IV) nitrate and zirconium(IV) nitrate pentahydrate as raw materials. The reference sample, tourmaline modified with ammonium cerium(IV) nitrate alone was also prepared by a similar precipitation route. The results of Fourier transform infrared spectroscopy show that tourmaline modified with Ce and Zr has a better far-infrared emission property than tourmaline modified with Ce alone. Through characterization by transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), the mechanism for oxygen evolution during the heat process in the two composite materials was systematically studied. The XPS spectra show that [math] ratio inside tourmaline modified with Ce alone can be raised by doping Zr. Moreover, it is showed that there is a higher [math] ratio inside the tourmaline modified with Ce and Zr than tourmaline modified with Ce alone. In addition, XRD results indicate the formation of [math] and [math] crystallites during the heat treatment and further TEM observations show they exist as nanoparticles on the surface of tourmaline powders. Based on these results, we attribute the improved far-infrared emission properties of Ce–Zr doped tourmaline to the enhanced unit cell shrinkage of the tourmaline arisen from much more oxidation of [math] to [math] inside the tourmaline caused by the change in the catalyst redox properties of [math] brought about by doping with [math]. In all samples, tourmaline modified with 7.14 wt.% Ce and 1.86 wt.% Zr calcined at 800[math]C for 5 h has the best far-infrared emission property with the maximum emissivity value of 98%. Citation: Modern Physics Letters B PubDate: 2015-10-13T07:26:10Z DOI: 10.1142/S0217984915501833

Authors:R. Karimi, S. H. Asadpour, S. Batebi, H. Rahimpour Soleimani Abstract: Modern Physics Letters B, Ahead of Print. The influence of external magnetic field and relative phase between two electric field components of the probe field on absorption–dispersion and group index of a four-level atomic system with two degenerate sublevels are investigated. The results show that, the behaviors of weak probe light can be controlled by an external magnetic field. It is shown that in the presence of the external magnetic field the additional electromagnetically induced transparency (EIT) window can be obtained. Our result also reveal that the switching from slow to fast light or vice versa can be manipulated by changing the phase difference between the two circularly polarized components of a single coherent field. Citation: Modern Physics Letters B PubDate: 2015-10-13T07:26:08Z DOI: 10.1142/S0217984915501857

Authors:Xianguo Geng, Liang Guan, Bo Xue Abstract: Modern Physics Letters B, Ahead of Print. A hierarchy of integrable nonlinear differential-difference equations associated with a discrete [math] matrix spectral problem is proposed based on the discrete zero-curvature equations. Then, Hamiltonian structures for this hierarchy are constructed with the aid of the trace identity. Infinitely many conservation laws of the hierarchy are derived by means of spectral parameter expansions. Citation: Modern Physics Letters B PubDate: 2015-10-13T07:26:06Z DOI: 10.1142/S0217984915501900

Authors:Hsuan Tung Peng, Yew Kam Ho Abstract: Modern Physics Letters B, Ahead of Print. We have investigated quantum entanglement for two interacting ultracold bosonic atoms in one-dimensional harmonic traps. The effective potential is modeled by delta interaction. For this two-atom system, we have investigated quantum entanglement properties, such as von Neumann entropy and linear entropy for its ground state and excited states. Using a computational scheme that is different from previously employed, a total of the lowest 16 states are studied. Here we show the dependencies of entanglement properties under various interacting strengths. Comparisons for the ground state entanglement are made with earlier results in the literature. New results for the other 15 excited states are reported here. Citation: Modern Physics Letters B PubDate: 2015-10-13T07:26:05Z DOI: 10.1142/S0217984915501894

Authors:Aamir Razaq, Asim Ali Khan, M. H. Asif, Shahid Iqbal, Jawad Ali, Faisal Manzoor, M. S. Awan Abstract: Modern Physics Letters B, Ahead of Print. Naturally, existing lignocelluloses fibers showed outstanding potential in paper industry and other conventional applications. On the other hand, lignocellulose fibers are suitable candidate for high-tech applications under the scope of abundance, flexibility, light-weight and environment friendliness. In this study, paper sheets were prepared from lignocelluloses fibers extracted from self-growing plant, typha angustifolia. Lignocelluloses paper sheets were characterized for scanning electron microscopy (SEM), universal testing machine (UTM) and vector network analyzer (VNA). Flexible paper sheets displayed a tensile strength of 9.1 MPa and further used as a substrate in patch antenna to observe dielectric characteristics. The patch antenna is designed at 5.1 GHz which showed return loss less than −10 dB and dielectric constant 3.71. The use of lignocelluloses paper sheet as a substrate in patch antenna will provide the opportunity of miniaturization of size and weight in comparison of a jean substrate based antenna. Citation: Modern Physics Letters B PubDate: 2015-10-13T07:26:04Z DOI: 10.1142/S0217984915501870

Authors:Sylvain D. Brechet, Jean-Philippe Ansermet Abstract: Modern Physics Letters B, Ahead of Print. The thermodynamics of irreversible processes in continuous media predicts the existence of a magnetic Nernst effect that results from a magnetic analog to the Seebeck effect in a ferromagnet and magnetophoresis occurring in a paramagnetic electrode in contact with the ferromagnet. Thus, a voltage that has DC and AC components is expected across a Pt electrode as a response to the inhomogeneous magnetic induction field generated by magnetostatic waves of an adjacent YIG slab subject to a temperature gradient. The voltage frequency and dependence on the orientation of the applied magnetic induction field are quite distinct from that of spin pumping. Citation: Modern Physics Letters B PubDate: 2015-10-01T03:48:29Z DOI: 10.1142/S0217984915502462