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Biblioteca Hispanica : Notions of Natural History

By: Benito Garcia De Los Santos
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Review of Scientific Instruments : Polarization orthogonalizer for...

By: Sin Hyuk Yim, T. H. Yoon, and D. Cho

Description: We have demonstrated a device to produce an overlapping pair of orthogonally polarized laser beams with a 3 GHz frequency offset out of a single laser beam containing the two frequency components with the same linear polarization. Our design is based on a Michelson interferometer formed by a polarizing beam splitter and two quarter-waveplates. Such a device can be used to make the polarization states of a carrier and a sideband produced through modulation mu...

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Journal of Applied Physics : Characterization of dilute InPN layer...

By: T. D. Das, S. Dhar, and B. M. Arora

Description: We have grown dilute InPN layers by liquid phase epitaxy and characterized them using high resolution x-ray diffraction, optical absorption, low temperature photoluminescence, and Hall measurement techniques. Our results indicate that a maximum amount of 0.2% nitrogen has been incorporated in the material with a band gap lowering consistent with expectations. The crystalline quality of the material is found to improve upon nitrogen incorporation. Large incre...

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The Journal of Chemical Physics : Constructing explicit magnetic a...

By: Jacob D. Stevenson, Aleksandra M. Walczak, Randall W. Hall, and Peter G. Wolynes

Description: By defining a spatially varying replica overlap parameter for a supercooled liquid referenced to an ensemble of fiducial liquid state configurations, we explicitly construct a constrained replica free energy functional that maps directly onto an Ising Hamiltonian with both random fields and random interactions whose statistics depend on the liquid structure. Renormalization group results for random magnets when combined with these statistics for the Lennard-...

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Physics of Plasmas : Mechanisms and scalings of energetic ion tran...

By: T. Hauff and F. Jenko

Description: The turbulent E×B advection of energetic ions in three-dimensional tokamak geometry is investigated both analytically and numerically. It is shown that orbit averaging (leading to a significant reduction of the diffusivity) is only valid for low magnetic shear. At moderate or high magnetic shear, a rather slow decrease of the diffusivity is found, proportional to (E/Te)−1 or (E/Te)−1.5 for particles with a large or small parallel velocity component, respecti...

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Review of Scientific Instruments : A furnace to 1200 K for in situ...

By: Quan Cai, Qiang Wang, Wei Wang, Guang Mo, Kunhao Zhang et al

Description: A furnace with a water-cooled outside shell has been assembled to do in situ x-ray diffraction (XRD), small angle x-ray scattering (SAXS), and x-ray absorption fine structure (XAFS) experiments. The details of the furnace are described in this paper. The in situ XRD, SAXS, and XAFS experiments during the heating process demonstrate that the available temperature range of this furnace is from room temperature to 1200 K with a temperature accuracy of ±0.1 K. B...

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Applied Physics Letters : Glasslike state in PbFe1/2Nb1/2O3 single...

By: Ashok Kumar, R. S. Katiyar, Carlos Rinaldi, Sergey G. Lushnikov, and Tatjana A. Shaplygina

Description: Magnetic properties of PbFe1/2Nb1/2O3 single crystal showed onset of glasslike behavior at 120 K, saturation of onset at 28 K, and freezing of glasslike state at 27.6 K. Zero field cooled (ZFC) and field cooled magnetization curves displayed sharp cusp in ZFC. Almeida and Toulouse line illustrated stability over 1000 Oe with unstable onset for low field. Magnetic hysteresis was observed below glasslike freezing temperature having steplike behavior and low co...

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The Journal of Chemical Physics : Kinetic and theoretical study of...

By: Andrés Garzón, José Albaladejo, Alberto Notario, Tomás Peña-Ruiz, and Manuel Fernández-Gómez

Description: The reactions of Cl with a series of linear thiols: 1-propanethiol (k1), 1-butanethiol (k2), and 1-pentanethiol (k3) were investigated as a function of temperature (in the range of 268–379 K) and pressure (in the range of 50–200 Torr) by laser photolysis-resonance fluorescence. Only 1-propanethiol has previously been studied, but at 1 Torr of total pressure. The derived Arrhenius expressions obtained using our kinetic data were as follows: k1 = (3.97±0.44)×1...

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Applied Physics Letters : Directing the transportation of a water ...

By: Qian Feng Xu, Jian Nong Wang, Ian H. Smith, and Kevin D. Sanderson

Description: Directional transportation of a ball-like water droplet on a superhydrophobic (SH) surface has been experimentally demonstrated. A SH surface with a water contact angle of as high as 160° and a sliding angle close to 0° is prepared by a sol-gel method based on removable polymeric nanospheres. A designed path line is then created on the prepared SH surface. The contact angle possesses anisotropy on the patterned SH surface. When the tilted angle of the patter...

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Journal of Applied Physics : Crystal structure effect on the ferro...

By: Bo Gu, Nejat Bulut, and Sadamichi Maekawa

Description: We study the ferromagnetism in the compound (Zn,Mn)O within the Haldane–Anderson impurity model by using the quantum Monte Carlo technique and the tight-binding approximation for determining the host band structure and the impurity-host hybridization. This computational approach allows us to determine how the host crystal structure influences the impurity bound state, which plays an important role in the development of the ferromagnetic (FM) correlations bet...

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Physics of Fluids : Characteristics of cylindrical flame accelerat...

By: Kuo-Long Pan and Roman Fursenko

Description: We have studied the outward propagation of a cylindrical flame by means of a flame-tracking numerical method and direct computation of the Sivashinsky equation. The flame speed is modified by the local curvature, via a Markstein length ℓ, that somehow groups the complicated physiochemical effects and can be monotonically relevant to the system pressure. The flame is found to accelerate in a universal profile as a function of time, which is insensitive to ini...

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Journal of Applied Physics : Structure and photoinduced volume cha...

By: R. Lukács, J. Hegedüs, and S. Kugler

Description: Atomic scale computer simulations on structures and photoinduced volume changes of flatly and obliquely deposited amorphous selenium (a-Se) films have been carried out in order to understand how the properties of chalcogenide glasses are influenced by their preparation method. Obliquely deposited a-Se thin films contain more coordination defects and larger voids than the flatly deposited ones. To model the photoinduced volume changes the electron excitation ...

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Applied Physics Letters : Restoration of high spatial frequency at...

By: Du Hyun Beak, Jin Woo Yoon, Jae Sung Shin, and Hong Jin Kong

Description: We have found experimentally that it is possible to restore the high spatial frequency of optical images by using stimulated Brillouin scattering (SBS) with a prepulse. The Stokes wave usually has to lose the high spatial frequency because of the necessary energy to generate the acoustic grating. However, this problem has been resolved by using a prepulse method. We have achieved an amplitude increase of ~41% compared to the normal SBS scheme at a spatial ...

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Review of Scientific Instruments : A collective scattering system ...

By: D. R. Smith, E. Mazzucato, W. Lee, H. K. Park, C. W. Domier et al

Description: A collective scattering system has been installed on the National Spherical Torus Experiment (NSTX) to measure electron gyroscale fluctuations in NSTX plasmas. The system measures fluctuations with k⊥ρe≲0.6 and k⊥≲20 cm−1. Up to five distinct wavenumbers are measured simultaneously, and the large toroidal curvature of NSTX plasmas provides enhanced spatial localization. Steerable optics can position the scattering volume throughout the plasma from the magnet...

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Physics of Plasmas : Solitary inertial Alfvén waves in dusty plasmas

By: S. Mahmood and H. Saleem

Description: Linear and nonlinear inertial Alfvén waves are studied in the presence of positively and negatively charged dust in electron-ion plasmas. The Sagdeev potential approach is employed to obtain solitary inertial Alfvén waves in such a multicomponent plasma. It is found that electron density dips are formed in the super Alfvénic region, which has behavior similar to the case of electron-ion plasmas. The amplitude of the electron density dip structure is decrease...

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Journal of Applied Physics : Lattice contraction during amorphizat...

By: C. Suryanarayana and Satyajeet Sharma

Description: Amorphization has been achieved in blended elemental Fe-based multicomponent alloy powders by mechanical alloying. The effect of Nb addition to the Fe42Ni28Zr10−xNbxB20 alloy in the composition range of 1–6 at. % Nb has been investigated and it was shown that the glass-forming ability (GFA) of the alloys, defined as the milling time required to produce an amorphous phase, improved with Nb addition. The improvement was not regular; the highest GFA was achieve...

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Journal of Applied Physics : Dynamics of optically injected two-di...

By: E. Ya. Sherman, R. M. Abrarov, and J. E. Sipe

Description: We investigate the charge and spin dynamics of optically injected currents in multiple quantum well structures using a hydrodynamic model. The dynamics is very complex even on time scales of the order of 1 ps due to the interplay of Coulomb forces, electron-hole drag effects, and nonlinearity of the equations of motion. Our analysis is based on a numerical approach employing an expansion of the calculated quantities in a Hermite–Gaussian basis. We calculate ...

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The Journal of Chemical Physics : Perturbative calculation of spin...

By: Kerstin Klein and Jürgen Gauss

Description: Spin-orbit splittings for 2Π states are calculated within coupled-cluster (CC) theory via first-order degenerate perturbation theory. Using the equation-of-motion CC variant for ionization potentials (EOMIP-CC), the two components of the considered 2Π state are treated in a balanced way by generating both radical states via annihilation of one electron out of the CC wave function of the corresponding anion. We report on the implementation of the described ap...

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Journal of Applied Physics : Relaxations in Ba2BiSbO6 double compl...

By: Manoel Carvalho Castro, Carlos William de Araujo Paschoal, Frank C. Snyder, and Michael W. Lufaso

Description: The electric properties of the complex double perovskite Ba2BiSbO6 have been investigated using impedance spectroscopy in the frequency range from 1 Hz up to 1 MHz and in the temperature range from room temperature up to 560 K. There are two contributions to the electrical properties due to the grain and grain boundary. The oxygen vacancies play an important role in the conductivity and strongly increase the dielectric constant at high temperatures. The anal...

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The Journal of Chemical Physics : Monte Carlo simulations of 1,3,5...

By: Neeraj Rai, Divesh Bhatt, J. Ilja Siepmann, and Laurence E. Fried

Description: The transferable potentials for phase equilibria (TraPPE) force field was extended to nitro and amino substituents for aromatic rings via parametrization to the vapor-liquid coexistence curves of nitrobenzene and aniline, respectively. These groups were then transferred to model 1,3,5-triamino-2,4,6-trinitrobenzene (TATB). Without any further parametrization to solid state data, the TraPPE force field is able to predict TATB’s unit cell lengths and angles at...

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