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Biblioteca Hispanica : Policy and Natural History of the Island of...

By: Ramon De La Sagra
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Journal of Applied Physics : Tuning of oxidation states in the LaN...

By: Bruno Berini, Niels Keller, Benjamin Pigeau, Yves Dumont, Elena Popova et al

Description: The LaNiO3−δ perovskite has been studied during its reoxygenation process at the reversible insulator-metal transition by spectroscopic ellipsometry for different pressures and temperatures conditions. First, it was demonstrated that the reoxygenation dynamics increases with both increasing pressure and temperature. Considering the temperature dependent experiments, two regimes of kinetics have been identified: a slow reoxygenation dynamics at low temperatur...

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Journal of Applied Physics : Growth and field emission characteris...

By: S. K. Arora, S. Chhoker, N. K. Sharma, V. N. Singh, and V. D. Vankar

Description: The effect of substrate pretreatments such as ultrasonication or scratching by diamond powder on the microstructure and field emission characteristics of diamond grown over silicon and macroporous (anodized) silicon substrates was investigated. These films were grown in a hot filament chemical vapor deposition (CVD) system. Scanning electron microscope (SEM) studies revealed that ultrasonic pretreatment of the substrates increases nucleation density of CVD d...

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Chaos : The development of truncated inviscid turbulence and the F...

By: G. Ooms and B. J. Boersma

Description: A study was made of the possible similarity between the development of truncated, inviscid turbulence and the Fermi–Pasta–Ulam (FPU) problem. For the case of a constant time scale, which resembles the FPU problem, a significant increase in the time to achieve equipartition was found when the initial energy was decreased. At first a few modes were generated and only rather late in the spectral development other modes appear and equipartition was established.

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Biblioteca Hispanica : Elements of Natural History, 1889

By: Philip Picatoste
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Applied Physics Letters : Elliptically polarized terahertz emissio...

By: Yanping Chen, Claude Marceau, Weiwei Liu, Zhen-Dong Sun, Yizhu Zhang et al

Description: Elliptically polarized terahertz emission from a femtosecond laser filament in air in the forward direction was discovered by using a wire grid polarizer and electro-optic sampling technique. The generation mechanism could be through four-wave optical rectification or second-order optical rectification inside the filament zone where the inversion symmetry of air is broken.

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Journal of Applied Physics : Selective transmittance of linearly p...

By: Viktor Leontyev, Nicholas G. Wakefield, Kyrylo Tabunshchyk, Jeremy C. Sit, Michael J. Brett et al

Description: Columnar thin films exhibiting linear polarization selectivity have been theoretically investigated and fabricated using the glancing angle deposition (GLAD) technique. The film structure employed an s-shaped columnar morphology that may be either smoothly bent or composed of discrete segments. Finite-difference time-domain and frequency-domain methods have been used to model these thin film structures numerically. Simulation results have yielded optimal geo...

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Biblioteca Hispanica : Memory Read at the University of Madrid for...

By: Manuel López González

Description: Leveling

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Journal of Applied Physics : Simulation of the bulk and surface mo...

By: M. A. Shapiro, K. R. Samokhvalova, J. R. Sirigiri, R. J. Temkin, and G. Shvets

Description: We present a numerical study of the electromagnetic properties of the three-dimensional metallic wire lattices operating at microwave frequencies with applications to advanced accelerating structures and microwave sources. The metallic lattices can be considered as “artificial plasmas” because they demonstrate the properties of plasmas with a negative dielectric constant. Bulk modes in a diamond lattice of metal wires and surface modes on its interface are c...

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Applied Physics Letters : Organic heterostructure device with nonv...

By: Frank Lindner, Karsten Walzer, and Karl Leo

Description: Recently, several memory devices based on organic semiconductors were reported. In most cases, single organic layers were employed, and the switching mechanisms were not fully understood. Here, we report on a novel device structure based on electrically doped organic heterostructures showing highly stable memory behavior. The organic layers are embedded between a bottom indium tin oxide and a top metal contact and form a quantum well-like structure. The devi...

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Physics of Plasmas : Reduction of chaotic particle transport drive...

By: F. A. Marcus, I. L. Caldas, Z. O. Guimarães-Filho, P. J. Morrison, W. Horton et al

Description: Investigations of chaotic particle transport by drift waves propagating in the edge plasma of tokamaks with poloidal zonal flow are described. For large aspect ratio tokamaks, the influence of radial electric field profiles on convective cells and transport barriers, created by the nonlinear interaction between the poloidal flow and resonant waves, is investigated. For equilibria with edge shear flow, particle transport is seen to be reduced when the electri...

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Physics of Plasmas : Structure based statistical theory of intermi...

By: Eun-jin Kim and Johan Anderson

Description: A general statistical theory of the intermittency in turbulence based on short-lived coherent structures (instantons) is presented. The probability density functions (PDFs) of the flux R are shown to have an exponential scaling P(R)∝exp(−cRs) in the tails, with the exponent s = (n+1)/m. Here, n and m are the order of the highest nonlinear interaction term and moments for which the PDFs are computed, respectively; c is constant depending on spatial profile of...

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Chaos : Beyond harmonic sounds in a simple model for birdsong prod...

By: Ana Amador and Gabriel B. Mindlin

Description: In this work we present an analysis of the dynamics displayed by a simple bidimensional model of labial oscillations during birdsong production. We show that the same model capable of generating tonal sounds can present, for a wide range of parameters, solutions which are spectrally rich. The role of physiologically sensible parameters is discussed in each oscillatory regime, allowing us to interpret previously reported data.

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The Journal of Chemical Physics : Molecular dynamics simulation of...

By: Hossein Eslami, Farkhondeh Mozaffari, Jalil Moghadasi, and Florian Müller-Plathe

Description: A method for the simulation of fluids confined between surfaces is developed. The molecular dynamics, with coupling to an external bath, simulation method of Berendsen et al. [J. Chem. Phys. 81, 3684 (1984) ] is extended for this purpose. We keep the temperature and the parallel component of pressure fixed and change the box length in the perpendicular direction with respect to the confining surfaces to archive equilibrium. The simulation is easy to perform,...

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Journal of Applied Physics : Growth and characterization of Er-dop...

By: Andrea Arcangeli, Daniela Parisi, Alessandra Toncelli, Mauro Tonelli, Marco Bazzan et al

Description: Single crystal lithium niobate fibers with diameters ranging from 1 to 3 mm have successfully been grown by the micro-pulling-down technique. The fibers are doped with various Er doping levels from 0 to 0.7 mol % and appear to be transparent and crack-free. The study includes x-ray structural investigation and complete spectroscopic characterization. The analysis shows a good homogeneity of composition, and the comparison with bulk crystals demonstrates the ...

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Physics of Fluids : An analysis of the far-field response to exter...

By: J. B›awzdziewicz and E. Wajnryb

Description: The leading-order far-field scattered flow produced by a particle in a parallel-wall channel under creeping-flow conditions has a form of the parabolic velocity field driven by a two-dimensional dipolar pressure distribution. We show that in a system of hydrodynamically interacting particles, the pressure dipoles contribute to the macroscopic suspension flow in a similar way as the induced electric dipoles contribute to the electrostatic displacement field. ...

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Applied Physics Letters : Measurement and evaluation of the interf...

By: Heng-Chieh Chien, Da-Jeng Yao, and Cheng-Ting Hsu

Description: We used a sandwiched film structure of dielectric, metal, and dielectric to measure and also to estimate theoretically the metal-dielectric interfacial thermal resistance. In this structure, a metal layer with a thickness of about 10 nm, including chromium, titanium, aluminum, nickel, and platinum, is sandwiched between two SiO2 layers with a thickness of 100 nm prepared by plasma enhanced chemical vapor deposition. The estimates, 10−10–10−9 m2 K W−1, calcul...

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Journal of Applied Physics : High-performance C60 n-channel organi...

By: Xiao-Hong Zhang and Bernard Kippelen

Description: High-performance C60 organic field-effect transistors (OFETs) have been obtained by engineering the essential electrode/semiconductor and dielectric/semiconductor interfaces. By using calcium (Ca) as the source and drain electrodes, the width-normalized contact resistance (RCW) at the electrode/semiconductor interface for devices with channel lengths ranging from 200 down to 25 μm could be reduced to a constant value of 2 kΩ cm at a gate-source voltage (VGS)...

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Applied Physics Letters : The effect of aluminum oxide incorporati...

By: Monica Sawkar-Mathur, Ya-Chuan Perng, Jun Lu, Hans-Olof Blom, John Bargar et al

Description: Hafnium aluminate thin films were synthesized by atomic layer deposition (ALD) to assess the effect of aluminum oxide incorporation on the dielectric/Ge interfacial properties. In these HfxAlyOz thin films, the Hf to Al cation ratio was effectively controlled by changing the ratio of hafnium oxide to aluminum oxide ALD cycles, while their short range order was changed upon increasing aluminum oxide incorporation, as observed by extended x-ray absorption fine...

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Journal of Applied Physics : Fourier transform infrared spectrosco...

By: G. Scardera, T. Puzzer, G. Conibeer, and M. A. Green

Description: A correlation between bonding changes in silicon-rich silicon nitride films, subjected to high temperature annealing under N2 ambient, and the formation of silicon nanocrystals is presented. The postannealing appearance of a shoulder between 1000 and 1100 cm−1 in the Fourier transform infrared (FTIR) spectra of silicon-rich silicon nitride films is attributed to a reordering in the films toward an increased SiN4 bonding configuration resulting from the preci...

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