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Biblioteca Hispanica : Elements of Natural History Book Written fo...

By: Gabriel Corbella
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Journal of Applied Physics : Subwavelength imaging based on freque...

By: Stanislav Maslovski, Pekka Alitalo, and Sergei Tretyakov

Description: A new principle of subwavelength imaging based on frequency scanning is considered. It is shown that it is possible to reconstruct the spatial profile of an external field exciting an array (or coupled arrays) of subwavelength-sized resonant particles with a frequency scan over the whole band of resonating array modes. During the scan it is enough to measure and store the values of the near field at one or at most two points. After the scan the distribution ...

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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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Physics of Fluids : Selection of the divergence waves on a model v...

By: V. P. Reutov and G. V. Rybushkina

Description: The paper is concerned with the established regimes of generation of the divergence (quasistatic) waves on a model viscoelastic coating under a potential flow of an incompressible liquid. Parameters of the effective coating that consists of a strongly damped flexible plate supported by an extended spring foundation are evaluated using the condition of modeling the deformation of the viscoelastic layer of a rubberlike material in the available experiments. Th...

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Journal of Applied Physics : Reflection chromaticity of multilayer...

By: E. M. Nascimento, I. N. de Oliveira, and M. L. Lyra

Description: We investigate the chromaticity of the light reflected by multilayered structures containing cholesteric liquid crystals (ChLCs). We considered a single-pitched ChLC multilayered system with quasiperiodic Fibonaccian phase defects as well as an alternate sequence of single-pitched ChLC and isotropic dielectric layers. Using the Berreman 4×4 matrix formalism, we numerically obtain the reflection spectrum and the chromaticity diagram of these structures. The a...

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Physics of Fluids : Modeling of the subfilter scalar dissipation r...

By: G. Balarac, H. Pitsch, and V. Raman

Description: In this work, modeling of the subfilter scalar dissipation rate is addressed. First, the best set of quantities to write a model is determined using the concept of optimal estimators. This study shows that the best approach is to assume a proportionality between the turbulent time scale and turbulent scalar mixing time scale. It is shown that the turbulent time scale should be defined by the subfilter kinetic energy. To define the coefficient appearing in th...

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Physics of Plasmas : Laser mode effects on the ion acceleration du...

By: M. Chen, A. Pukhov, Z. M. Sheng, and X. Q. Yan

Description: Ion acceleration by circularly polarized laser pulses interacting with foil targets is studied using two dimensional particle-in-cell simulations. It is shown that laser pulses with transverse super-Gaussian profile help in avoiding target deformation as compared with the usual Gaussian pulse. This improves monochromaticity of the accelerated ion spectrum. Two kinds of surface instabilities have been found during the interaction. These instabilities can pote...

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Journal of Applied Physics : Inherent paramagnetic defects in laye...

By: M. Jivanescu, A. Stesmans, and M. Zacharias

Description: An extensive electron spin resonance (ESR) analysis has been carried out on structures comprised of Si nanoparticles ( ∼ 2 nm across) embedded in a regular pattern in an amorphous SiO2 matrix, fabricated by the SiO/SiO2 superlattice approach, with the intent to reveal and quantify occurring paramagnetic defects. The as-grown state is found to exhibit only a Si dangling bond (DB) signal, which through combination of first and second harmonic X-, K-, and Q-ban...

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The Journal of Chemical Physics : Dissipation in molecular junctions

By: Ryan Jorn and Tamar Seideman

Description: A recently developed theory that formulates the phenomena of inelastic transport and current-driven dynamics in molecular-scale electronics within a time-dependent scattering approach is extended to account for dissipation of the current-induced excitation through coupling to electrode phonons and electron-hole pairs. Our approach treats the electronic transport, the nuclear dynamics, and the energy and phase exchange between the electronic and the vibration...

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Biblioteca Hispanica : Studies of Natural Philosophy

By: Enrique Fatigati Serrano
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Physics of Fluids : Introduction: 25th Annual Gallery of Fluid Mot...

By: Todd B. Harman

Description:

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Journal of Applied Physics : Ultrasonic generation and rotation of...

By: Zhi Wen Tan, Su Gui Gisela Teo, and Junhui Hu

Description: We show that a hypodermic needle can generate and rotate a small droplet of water around its needle tip when the hypodermic needle is mechanically driven by an acoustic needle. The water droplet increases in size with the driving time and begins to rotate around the tip of the hypodermic needle when the diameter of the droplet is large enough. The rotating droplet falls off when its diameter is larger than a critical value of several millimeters. For a given...

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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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Chaos : Detecting topological features of chaotic fluid flow

By: Nicholas T. Ouellette and J. P. Gollub

Description:

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The Journal of Chemical Physics : Monte Carlo simulations of amphi...

By: Jonathan R. Davis and Athanassios Z. Panagiotopoulos

Description: Grand canonical Monte Carlo simulations on a cubic lattice are used to examine aggregation and phase separation of model amphiphiles with bulky head groups. The amphiphiles studied consist of a rigid, roughly spherical nanoparticle attached to one or more flexible chains. Overlapping distributions of energy and density are combined via histogram reweighting to obtain the free energy and osmotic pressure as a function of temperature and concentration. Finite ...

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Review of Scientific Instruments : Microbeam-integrated multiphoto...

By: Alan W. Bigelow, Charles R. Geard, Gerhard Randers-Pehrson, and David J. Brenner

Description: Multiphoton microscopy has been added to the array of imaging techniques at the endstation for the Microbeam II cell irradiator at Columbia University’s Radiological Research Accelerator Facility (RARAF). This three-dimensional (3D), laser-scanning microscope functions through multiphoton excitation, providing an enhanced imaging routine during radiation experiments with tissuelike samples, such as small living animals and organisms. Studies at RARAF focus o...

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Applied Physics Letters : Dielectric properties of Ba0.5Sr0.5TiO3/...

By: Niandeng Xiong, Shuwen Jiang, Yanrong Li, Lefan Tan, and Ruguan Li

Description: The Ba0.5Sr0.5TiO3(BST)/SiN bilayered thin films with a SiN layer serving as a buffer layer between the top electrode and the BST layer have been prepared onto Pt-coated c-plane sapphire substrates. The dielectric measurements show that the loss tangent has been significantly lowered. The dielectric properties of the BST/SiN bilayered thin films are strongly dependent on the SiN thickness. The BST/SiN bilayered thin films at a SiN/BST thickness ratio of 0.2 ...

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Physics of Fluids : Coherent flow states in a square duct

By: Håkan Wedin, Damien Biau, Alessandro Bottaro, and Masato Nagata

Description: The flow in a square duct is considered. Finite amplitude approximate traveling wave solutions, obtained using the self-sustaining-process approach introduced by Waleffe [Phys. Fluids 9, 883 (1997) ], are obtained at low to moderate Reynolds numbers and used as initial conditions in direct numerical simulations. The ensuing dynamics is analyzed in a suitably defined phase space. Only one among the traveling wave solutions found is capable of surviving for a ...

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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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Journal of Physical and Chemical Reference Data : Physical-Chemica...

By: Annika Åberg; Matthew MacLeod and Karin Wiberg

Description: Polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) are of global concern due to their persistence, their tendency to bioaccumulate, and their extremely high toxicity. The fate of the PCDD/Fs in the environment is largely determined by their physical-chemical properties, such as solubility in water (SW, mol m−3), solubility in octanol (SO, mol m−3), and vapor pressure (P, Pa). It is not unusual that the range of reported value...

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