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Biblioteca Hispanica : Speech Read on the Literary University of S...

By: Serafin Sanz and Agud

Description: Botany History

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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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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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Journal of Applied Physics : Modification of emission of CdTe nano...

By: Sergei G. Romanov, Maria Bardosova, Ian M. Povey, C. M. Sotomayor Torres, Martyn E. Pemble et al

Description: A light source on the surface of a slab of 2+1-dimensional photonic crystal has been prepared by the Langmuir–Blodgett deposition of a colloidal crystal on top of a thin film containing CdTe nanocrystals. The directional enhancement of the light emission intensity in the spectral range of the photonic bandgap has been revealed through the comparative examination of the angle-resolved transmission, diffraction, and photoluminescence spectra of the prepared st...

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Review of Scientific Instruments : Scalable time-correlated photon...

By: Michael Wahl, Hans-Jürgen Rahn, Tino Röhlicke, Gerald Kell, Daniel Nettels et al

Description: Time-correlated single photon counting continues to gain importance in a wide range of applications. Most prominently, it is used for time-resolved fluorescence measurements with sensitivity down to the single molecule level. While the primary goal of the method used to be the determination of fluorescence lifetimes upon optical excitation by short light pulses, recent modifications and refinements of instrumentation and methodology allow for the recovery of...

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Journal of Applied Physics : Efficient formation of surface relief...

By: Sung-Kwan Na, Jung-Sung Kim, Seok-Ho Song, Cha-Hwan Oh, Yang-Kyoo Han et al

Description: This paper reports a method for the efficient formation of surface relief grating (SRG) on azopolymer films in which gold nanoparticles are dispersed. The height and shape of the SRG, which were formed by a two-beam interference technique, were found to be dependent on the content of gold nanoparticles. The optimum concentration of gold nanoparticles for the efficient formation of SRG was confirmed by atomic force microscopy (AFM), and the height of SRG at t...

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Chaos : Hopf bifurcation control in a congestion control model via...

By: Songtao Guo, Gang Feng, Xiaofeng Liao, and Qun Liu

Description: A typical objective of bifurcation control is to delay the onset of undesirable bifurcation. In this paper, the problem of Hopf bifurcation control in a second-order congestion control model is considered. In particular, a suitable Hopf bifurcation is created at a desired location with preferred properties and a dynamic delayed feedback controller is developed for the creation of the Hopf bifurcation. With this controller, one can increase the critical value...

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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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Biblioteca Hispanica : Evolution in Nature

By: Enrique Fatigati Serrano
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Biblioteca Hispanica : the Nature and Man Popular Explanations of ...

By: Jose Espinal and Fuster
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Biblioteca Hispanica : Programme Reasoned Overview of a Course of ...

By: Emilio Ribera Gomez
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The Journal of Chemical Physics : Spontaneous charging and crystal...

By: Joost de Graaf, Jos Zwanikken, Markus Bier, Arjen Baarsma, Yasha Oloumi et al

Description: We study the spontaneous charging and the crystallization of spherical micron-sized water droplets dispersed in oil by numerically solving, within a Poisson–Boltzmann theory in the geometry of a spherical cell, for the density profiles of the cations and anions in the system. We take into account screening, ionic Born self-energy differences between oil and water, and partitioning of ions over the two media. We find that the surface charge density of the dro...

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Biblioteca Hispanica : Notions of Natural History for Children of ...

By: Alejandro Real
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Biblioteca Hispanica : Guide Cabinet of Natural History

By: Jose Maria Solano and Eulate
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Applied Physics Letters : Electric detection of ferromagnetic reso...

By: Xiong Hui, A. Wirthmann, Y. S. Gui, Y. Tian, X. F. Jin et al

Description: We report electric detection of ferromagnetic resonance (FMR) in epitaxially grown single crystal iron film through microwave photovoltage generation technique. The experimental results agree well with the established theory about FMR in iron films, showing excellent extendability of such a technique onto different ferromagnets as an effective way to study magnetocrystalline anisotropy and spin excitations. Furthermore, the information about the phase of mag...

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Physics of Fluids : A mathematical model of turbulent drag reducti...

By: Grigory Isaakovich Barenblatt

Description: Drag reduction, or the mean velocity increase in a turbulent flow at a fixed pressure drop through the addition of tiny amounts (several parts per million) of high-molecular-weight polymers (Thoms effect), has been known already for more than 60 years. Long ago it was understood that this effect is related to supramolecular structures formed in the flow. Recent experiments by Chu, Shaqfeh, and associates, where the motion of supramolecular structures was dir...

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Applied Physics Letters : Power dissipation spectra and terahertz ...

By: Y. M. Zhu, T. Unuma, K. Shibata, K. Hirakawa, Y. Ino et al

Description: We have investigated terahertz radiation emitted from electrons photoexcited by femtosecond laser pulses in bulk GaAs under strong bias electric fields. Power dissipation spectra of electrons for step-function-like input electric fields have been obtained by calculating Fourier spectra of the measured terahertz traces. The cutoff frequency νc for negative power dissipation (i.e., gain) due to intervalley transfer is found to gradually increase with increasin...

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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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The Journal of Chemical Physics : Equilibrium and nonequilibrium t...

By: J. B›awzdziewicz and E. Wajnryb

Description: Our recent quasi-two-dimensional thermodynamic description of thin liquid films stabilized by colloidal particles is generalized to describe nonuniform equilibrium states of films in external potentials and nonequilibrium transport processes produced in the film by gradients of thermodynamic forces. Using a Monte Carlo simulation method, we have determined equilibrium equations of state for a film stabilized by a suspension of hard spheres. Employing a multi...

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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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