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Chaos : Complete periodic synchronization in coupled systems

By: Wei Zou and Meng Zhan

Description: Recently, complete chaotic synchronization in coupled systems has been well studied. In this paper, we study complete synchronization in coupled periodic oscillators with diffusive and gradient couplings. Eight typical types of critical curve for the transverse Lyapunov exponent of standard mode, which give rise to different synchronization-desynchronization patterns, are classified. All possible desynchronous behaviors including steady state, periodic state...

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Biblioteca Hispanica : the Earth and Its Inhabitants Basic Knowled...

By: Jaime Rise and Nicolau
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Applied Physics Letters : Large cavity quantum cascade lasers with...

By: A. Bismuto, T. Gresch, A. Bächle, and Jérôme Faist

Description: Multicore quantum cascade lasers with large cavities show low optical losses, high saturation intensity, and low beam divergence. We present a four active core laser based on InGaAs–AlInAs material system emitting at 10.5 μm. To improve thermal conductance, InP interstacks were used to separate active regions. Selective lateral etching of the active regions was used to reduce optical losses. Peak powers up to 4.6 W, average powers up to 310 mW, and wall-plu...

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Chaos : Stability and multiple bifurcations of a damped harmonic o...

By: Yongli Song, Tonghua Zhang, and Moses O. Tadé

Description: We investigate the dynamics of a damped harmonic oscillator with delayed feedback near zero eigenvalue singularity. We perform a linearized stability analysis and multiple bifurcations of the zero solution of the system near zero eigenvalue singularity. Taking the time delay as the bifurcation parameter, the presence of steady-state bifurcation, Bogdanov–Takens bifurcation, triple zero, and Hopf-zero singularities is demonstrated. In the case when the system...

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Journal of Applied Physics : Gallium oxide and gadolinium gallium ...

By: G. W. Paterson, P. Longo, J. A. Wilson, A. J. Craven, A. R. Long et al

Description: Test devices have been fabricated on two specially grown GaAs/AlGaAs wafers with 10 nm thick gate dielectrics composed of either Ga2O3 or a stack of Ga2O3 and Gd0.25Ga0.15O0.6. The wafers have two GaAs transport channels either side of an AlGaAs barrier containing a Si δ-doping layer. Temperature dependent capacitance-voltage (C-V) and current-voltage (I-V) studies have been performed at temperatures between 10 and 300 K. Bias cooling experiments reveal the ...

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The Journal of Chemical Physics : A noniterative perturbative trip...

By: Prashant U. Manohar and Anna I. Krylov

Description: A noniterative N 7 triples correction for the equation-of-motion coupled-cluster method with single and double substitutions (CCSD) is presented. The correction is derived by second-order perturbation treatment of the similarity-transformed CCSD Hamiltonian. The spin-conserving variant of the correction is identical to the triples correction of Piecuch and co-workers [Mol. Phys. 104, 2149 (2006) ] derived within method-of-moments framework and is not size in...

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Applied Physics Letters : Gunn oscillations in a self-switching na...

By: K. Y. Xu, G. Wang, and A. M. Song

Description: The feasibility of Gunn oscillations in a planar nanoscale unipolar diode or a self-switching device (SSD) is analyzed using Monte Carlo simulations. The asymmetric nanochannel that the SSD is based on is shown to induce charge domains much more receptively when compared to a reference symmetric nanochannel. The oscillation frequency reaches 130 GHz. Potential applications are discussed in terms of the ease of heat dissipation and generation of oscillations ...

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Applied Physics Letters : Ag-modified silicon nanowires substrate ...

By: Ming-Wang Shao, Ming-Liang Zhang, Ning-Bew Wong, Dorothy Duo-duo Ma, Hui Wang et al

Description: We report a unique substrate for surface-enhanced raman spectroscopy (SERS) based on silver nanoparticles-embedded silicon nanowires (SiNWs). The SiNWs were prepared by thermal evaporation of SiO powder via oxide-assisted growth, oxide removed with HF, and then used to reduce silver ions to form a highly decorated Ag-embedded surface. Such modified SiNWs substrates yielded ultrahigh SERS sensitivity, which could detect 25 μl of 1×10−16M Rhodamine 6G, 1×10−16...

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The Journal of Chemical Physics : First-principles study of crysta...

By: Sheng Ju and Guang-Yu Guo

Description: Within the density functional theory with the generalized gradient approximation, we present a systematic ab initio investigation of crystal structure, electronic structure, and linear and nonlinear optical responses in a polar double perovskite Bi2ZnTiO6. The effect of B-site ordering is explored by comparing three possible configurations: A-type with alternative Zn and Ti layers stacking along the c axis; C-type with Zn and Ti c axis chains; and G-type wit...

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Biblioteca Hispanica : the Wonders of Nature

By: A. Ramon Sanchez
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Physics of Fluids : Topology and breakdown of Görtler vortices on ...

By: M. Canals and G. Pawlak

Description:

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Physics of Fluids : Helical instability of a rotating liquid jet

By: J. P. Kubitschek and P. D. Weidman

Description:

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Biblioteca Hispanica : Elementary Notions of Natural History

By: Alejandro Jose Martinez De La Raga
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Biblioteca Hispanica : Primer Natural History

By: Odo Good
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Review of Scientific Instruments : Cryogenic current-in-plane tunn...

By: Nicolas Weiss, Ute Drechsler, Michel Despont, and Stuart S. Parkin

Description: We have designed and fabricated a cryogenic variable-temperature current-in-plane tunneling apparatus to measure the magnetoresistive properties of unpatterned magnetic tunnel junction wafers as a function of temperature. The wafer is mounted on the cold finger of a liquid helium continuous flow cryostat. The temperature can be continuously varied between 7 and 330 K. We describe the design and fabrication of the micromachined silicon probe head that compris...

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The Journal of Chemical Physics : The Alzheimer ß-amyloid (Aß1–39)...

By: Priya Anand, Fateh S. Nandel, and Ulrich H. E. Hansmann

Description: Oligomers of Aβ peptides are suspected as the underlying cause of Alzheimer disease. Knowledge of their structural properties could therefore lead to a deeper understanding of the mechanism behind the outbreak of this disease. As a step in this direction we have studied Aβ dimers by all-atom molecular dynamics simulations. Equilibrated structures at 300 K were clustered into different families with similar structural features. The dominant cluster has parall...

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Journal of Applied Physics : Electron spin resonance study of self...

By: V. V. Laguta, M. Nikl, J. Rosa, B. V. Grinyov, L. L. Nagornaya et al

Description: The self-trapping of holes at oxygen anions was studied by electron spin resonance in UV irradiated CdWO4 crystals. Analysis of superhyperfine interaction of the holes with 183W and 111,113Cd isotopes shows that the self-trapped hole is either delocalized in the space between two energetically equivalent nearest neighbor oxygen ions or tunnels between them. When the temperature increases above 40–50 K the self-trapped holes are thermally liberated and can be...

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Chaos : Multistability and arithmetically period-adding bifurcatio...

By: Younghae Do and Ying-Cheng Lai

Description: Multistability has been a phenomenon of continuous interest in nonlinear dynamics. Most existing works so far have focused on smooth dynamical systems. Motivated by the fact that nonsmooth dynamical systems can arise commonly in realistic physical and engineering applications such as impact oscillators and switching electronic circuits, we investigate multistability in such systems. In particular, we consider a generic class of piecewise smooth dynamical sys...

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Applied Physics Letters : Current-induced flip-flop of magnetizati...

By: Woojin Kim, Taek Dong Lee, and Kyung-Jin Lee

Description: We performed a micromagnetic investigation of current-induced magnetization switching in perpendicular magnetic tunnel junctions with polarization-enhancement layers. The pinned layer with a polarization-enhancement layer can be excited and eventually reverses at a current density lower than the value theoretically expected from that without a polarization-enhancement layer. The reversal results in continuous flip-flops of magnetizations as long as the curre...

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Journal of Applied Physics : Simulation of electromechanical respo...

By: Simon Ching-kin Chow and Veng-cheong Lo

Description: The effect of static electric field on mechanical and dielectric properties of a lead zirconate titanate (PbZrxTi1−xO3) piezoceramic sample driven by an alternating compressive stress has been experimentally investigated by Zhou et al. [ J. Am. Ceram. Soc. 88, 867 (2005) ]. Numerical simulation for this experimental result using two-dimensional four-state Potts model is presented in this article. Upon polarization switching, the dipole in the perovskite cell...

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