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Physics of Plasmas : Nonlinear stationary solutions of the Wigner ...

By: F. Haas and P. K. Shukla

Description: Exact nonlinear stationary solutions of the one-dimensional Wigner and Wigner–Poisson equations in the terms of the Wigner functions that depend not only on the energy but also on position are presented. In this way, the Bernstein–Greene–Kruskal modes of the classical plasma are adapted for the quantum formalism in the phase space. The solutions are constructed for the case of a quartic oscillator potential, as well as for the self-consistent Wigner–Poisson ...

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Physics of Plasmas : Characterization of converging shock waves ge...

By: S. Efimov, A. Fedotov, S. Gleizer, V. Tz. Gurovich, G. Bazalitski et al

Description: Results of ∼ 200 kbar pressure generation at 50 μm distance from the implosion axis of the converging shock wave produced by an underwater electrical explosion of a cylindrical wire array are reported. The array was exploded using a submicrosecond high-current generator (stored energy of ∼ 4.2 kJ, current amplitude of ∼ 325 kA, rise time of ∼ 1 μs). Multiframe shadow imaging of the shock wave was used to determine its time of flight. These data were applied ...

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Review of Scientific Instruments : Benchtop time-resolved magneto-...

By: Anjan Barman, T. Kimura, Y. Otani, Y. Fukuma, K. Akahane et al

Description: We present here the construction and application of a compact benchtop time-resolved Kerr magnetometer to measure the magnetization precession in magnetic thin films and lithographically patterned elements. As opposed to very expensive femtosecond lasers this system is built upon a picosecond pulsed injection diode laser and electronic pulse and delay generators. The precession is triggered by the electronic pulses of controlled duration and shape, which is ...

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Physics of Plasmas : Ion-acoustic solitary waves and their interac...

By: Jiu-ning Han, Sheng-lin Du, and Wen-shan Duan

Description: This paper discusses the existence of ion-acoustic solitary waves and their interaction in a weakly relativistic two-dimensional thermal plasma. Two Korteweg–de Vries equations for small but finite amplitude solitary waves in both ξ and η directions are derived. The phase shifts and trajectories of two solitary waves after the collision with an arbitrary angle α are also obtained. The effects of parameters of the normalized ion temperature σ, the ratio of he...

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Journal of Mathematical Physics : Announcement: Special issue on ...

By: Bruno L. Z. Nachtergaele

Description:

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Applied Physics Letters : Enhanced contrast coherent anti-Stokes R...

By: Michael R. Beversluis and Stephan J. Stranick

Description: We have experimentally demonstrated enhanced image contrast of sample fine structure in a coherent anti-Stokes Raman scattering (CARS) microscope using liquid crystal spatial light modulators as programmable Toraldo-style pupil phase masks. We demonstrated through modeling, implementation, and verification of the focal intensity and phase distributions of the excitation beams the trade-offs between improved image contrast and CARS signal levels.

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Chaos : Swimming C. elegans in a wet granular medium

By: Sunghwan Jung, Stella Lee, and Aravinthan Samuel

Description:

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Journal of Applied Physics : Structural and electrical properties ...

By: E. Prokhorov, G. Trapaga, and J. González-Hernández

Description: The aim of this article is to study the properties of the crystalline face centered cubic Ge1Sb2Te4 phase as a function of annealing and measuring temperature. This material is one of the stoichiometric members of the Ge:Sb:Te family, which is widely used in the phase change data storage and one candidate for multistate recording. The electrical properties of this material have been investigated using two independent methods, the four probe impedance and the...

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Journal of Applied Physics : Relaxation time effects on dynamic co...

By: D. J. Shelton, T. Sun, J. C. Ginn, K. R. Coffey, and G. D. Boreman

Description: The behavior of nanoscale infrared antenna elements depends upon the dynamic conductivity of thin metallic films. Spectroscopic ellipsometer measurements of noble metal films show that when the product of the incident radiation frequency and the relaxation time is greater than unity, anomalous dynamic electron transport effects occur. In this regime electron scattering increases the conductivity of alloyed metallic films as demonstrated by ellipsometry measu...

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Review of Scientific Instruments : Infrared spectroscopic methods ...

By: Juan J. Nájera, Javier G. Fochesatto, Deborah J. Last, Carl J. Percival, and Andrew B. Horn

Description: A description of a new aerosol flow tube apparatus for measurements in situ under atmospherically relevant conditions is presented here. The system consists of a laboratory-made nebulizer generation system and a flow tube with a White cell-based Fourier transform IR for the detection system. An assessment of the White cell coupled to the flow tube was carried out by an extensive set of experiments to ensure the alignment of the infrared beam and optimize the...

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Physics of Fluids : Introduction: 25th Annual Gallery of Fluid Mot...

By: Todd B. Harman

Description:

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Chaos : Asymmetric spatiotemporal chaos induced by a polypoid mass...

By: Yu Zhang and Jack J. Jiang

Description: In this paper, asymmetric spatiotemporal chaos induced by a polypoid mass simulating the laryngeal pathology of a vocal polyp is experimentally observed using high-speed imaging in an excised larynx. Spatiotemporal analysis reveals that the normal vocal folds show spatiotemporal correlation and symmetry. Normal vocal fold vibrations are dominated mainly by the first vibratory eigenmode. However, pathological vocal folds with a polypoid mass show broken symme...

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Physics of Fluids : Dynamics of prolate ellipsoidal particles in a...

By: P. H. Mortensen, H. I. Andersson, J. J. J. Gillissen, and B. J. Boersma

Description: The dynamical behavior of tiny elongated particles in a directly simulated turbulent flow field is investigated. The ellipsoidal particles are affected both by inertia and hydrodynamic forces and torques. The time evolution of the particle orientation and translational and rotational motions in a statistically steady channel flow is obtained for six different particle classes. The focus is on the influence of particle aspect ratio λ and the particle response...

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Biblioteca Hispanica : Lessons of Natural History Accompanied by T...

By: Jose Maria Pascual
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Physics of Fluids : Numerical study of an original device to gener...

By: J. Giordano, J. D. Parisse, and P. Perrier

Description: This study is devoted to the design of an experimental device to generate shock waves in a micropipe. Indeed, the recent advances in the microfluidics of gas lead the scientific community to the question of scaling law in supersonic regime. Thus, in this paper, we simulate the flow induced by the opening of a small solenoid valve to know if it is able to generate a minishock wave. This shock wave moving in an intermediate pipe could be transmitted into a mic...

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Chaos : Stability diagram for the forced Kuramoto model

By: Lauren M. Childs and Steven H. Strogatz

Description: We analyze the periodically forced Kuramoto model. This system consists of an infinite population of phase oscillators with random intrinsic frequencies, global sinusoidal coupling, and external sinusoidal forcing. It represents an idealization of many phenomena in physics, chemistry, and biology in which mutual synchronization competes with forced synchronization. In other words, the oscillators in the population try to synchronize with one another while al...

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Biblioteca Hispanica : New Elements of Natural History Illustrated...

By: Ignacio Bolivar
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Review of Scientific Instruments : A time-resolved single-pass tec...

By: Jun Li, Xianming Zhou, and Jiabo Li

Description: An experimental method was developed to perform time-resolved, single-pass optical absorption measurements and to determine absorption coefficients of window materials under strong shock compression up to ∼ 200 GPa. Experimental details are described of (i) a configuration to generate an in situ dynamic, bright, optical source and (ii) a sample assembly with a lithium fluoride plate to essentially eliminate heat transfer from the hot radiator into the specim...

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Review of Scientific Instruments : Design of a double diaphragm sh...

By: Ingo Stotz, Grazia Lamanna, Harald Hettrich, Bernhard Weigand, and Johan Steelant

Description: A double diaphragm shock tube facility for studying liquid-spray atomization and combustion-related phenomena at elevated pressures and temperatures is described. The present shock tube is specifically intended for the investigation of fundamental processes related to fluid disintegration and mixing under realistic engine conditions. Special features of the facility include a variable-area driver section to compensate for shock attenuation, a square test sec...

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Review of Scientific Instruments : Correction of spherical aberrat...

By: Alexander Pikin and Ahovi Kponou

Description: Two methods to correct spherical aberration in electrostatic gridded lenses have been studied using ray-tracing simulations. Both methods are based on modifying the electrostatic field on the radial periphery of the lens. In the simplest case, the modification is done by extending the grid support axially. In the second method, the electric field on a radial periphery of the lens is modified by applying optimum voltage on an isolated correcting electrode. It...

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