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Physics of Plasmas : Characterization of self-similarity propertie...

By: A. Scipioni, P. Rischette, G. Bonhomme, and P. Devynck

Description: The understanding of turbulence in magnetized plasmas and its role in the cross field transport is still greatly incomplete. Several previous works reported on evidences of long-time correlations compatible with an avalanche-type of radial transport. Persistence properties in time records have been deduced from high values of the Hurst exponent obtained with the rescaled range R/S analysis applied to experimental probe data acquired in the edge of tokamaks. ...

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Physics of Fluids : Analytical solution for pulsatile viscous flow...

By: Sumeet Gupta, Dimos Poulikakos, and Vartan Kurtcuoglu

Description: We present here the analytical solution of transient, laminar, viscous flow of an incompressible, Newtonian fluid driven by a harmonically oscillating pressure gradient in a straight elliptic annulus. The analytical formulation is based on the exact solution of the governing fluid flow equations known as Navier–Stokes equations. We validate the analytical solution using a finite-volume computational fluid dynamics approach. As the analytical solution include...

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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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Journal of Applied Physics : Observation of coherent acoustic and ...

By: Alexandre A. Kolomenskii, Sergey N. Jerebtsov, Haidong Liu, Hong Zhang, Zuxin Ye et al

Description: Coherent acoustic and optical phonon oscillations in Bi nanowire samples were studied with a femtosecond pump-probe technique. Laser pulses of 50 fs excited simultaneously acoustic oscillations at a frequency of about 9.5 GHz and optical phonons in the terahertz range. The transmission signal of nanowires on a glass substrate and the signal of light scattered from freestanding nanowires were measured. The acoustic velocity in nanowires was found to be close ...

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The Journal of Chemical Physics : Intermolecular vibrations of dif...

By: J. Ceponkus, P. Uvdal, and B. Nelander

Description: Far infrared spectra of seven different isotopologs of the water dimer have been measured in neon matrices at 2.8 K. The experiments are interpreted with the aid of density functional theory calculations, in particular the calculated harmonic isotopic shifts were utilized. All six intermolecular vibrational modes of the water dimer and the fully deuterated water dimer are assigned based the isotopic shifts induced. 31 of a total of 42 intermolecular fundamen...

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Biblioteca Hispanica : Programme of Natural History, Physiology an...

By: Luis Perez Minguez
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Journal of Applied Physics : On PbTiO3-(111)-Pt interfacial layers...

By: S. Habouti, C-H. Solterbeck, M. Es-Souni, and V. Zaporojtchenko

Description: In this work emphasis is placed on the investigation of interfacial layers between sol-gel processed PbTiO3 (PTO) thin films and (111)Pt terminated silicon substrates. The methods used are x-ray diffraction, x-ray photoelectron spectroscopy (XPS) combined with depth profiling, and atomic force microscopy (AFM). In order to avoid artifacts related to ion bombardment, e.g., reduction of Pb ions and preferential sputtering, gentle argon ion bombardment conditio...

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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 : Testing the effect of surface coating...

By: S. J. Seltzer, D. M. Rampulla, S. Rivillon-Amy, Y. J. Chabal, S. L. Bernasek et al

Description: The evaluation of different surface coatings used in alkali metal atomic magnetometers is necessary for the improvement of sensitivity of these devices. A method to measure the polarization lifetime of alkali atoms in the region between substrates with different coatings was developed to determine the effectiveness of the coating at preserving alkali spin polarization as well as chemical compatibility and high-temperature stability. Multiple coatings can be ...

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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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Civil War and Civil War Related Prints : Col B Grierson, 6Th Ill C...

By: Michael Cáceres and Giron
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Biblioteca Hispanica : Practices of Natural History

By: Federico Luzuriaga and Aguirre
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Chaos : Modulational instability in a purely nonlinear coupled com...

By: Fabien II Ndzana, Alidou Mohamadou, and Timoléon C. Kofané

Description: We study wave propagation in a nonlinear transmission line with dissipative elements. We show analytically that the telegraphers' equations of the electrical transmission line can be modeled by a pair of continuous coupled complex Ginzburg–Landau equations, coupled by purely nonlinear terms. Based on this system, we investigated both analytically and numerically the modulational instability (MI). We produce characteristics of the MI in the form of typical de...

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Applied Physics Letters : Low temperature diffusion length of exci...

By: Naoyuki Ino and Naoki Yamamoto

Description: Monochromatic cathodoluminescence (CL) images of threading dislocations in GaN epitaxial layers were observed using a transmission electron microscopy combined with CL system. The carrier diffusion lengths were derived from the free exciton emission intensity profile of the dislocation contrast in the CL images. The carrier diffusion lengths in Si-doped and Mg-doped GaN were nearly the same and shorter than that in undoped GaN in the temperature range from 2...

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Journal of Applied Physics : Geometric optimization of an active m...

By: Peng Li, Maoqiong Gong, and Jianfeng Wu

Description: Previous analyses [ Z. Yan and J. Chen, J. Appl. Phys. 72, 1 (1992) ; J. Chen and Z. Yan, ibid., 84, 1791 (1998) ; Lin et al., Physica B 344, 147 (2004) ; Yang et al., ibid., 364, 33 (2005) ; Xia et al., ibid., 381, 246 (2006). ] of irreversibilities in magnetic refrigerators overlooked several important losses that could be dominant in a real active magnetic regenerative refrigerator (AMRR). No quantitative expressions have been provided yet to estimate the...

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Journal of Applied Physics : Spatio-temporal Talbot phenomenon usi...

By: J. S. Gómez-Díaz, A. Alvarez-Melcon, S. Gupta, and C. Caloz

Description: A spatial-temporal Talbot phenomenon, based on metamaterial composite right/left-handed (CRLH) leaky-wave antennas (LWAs), is presented. This phenomenon, reported in the microwave domain, is based on the combination of the conventional spatial monochromatic Talbot effect and the transient (polychromatic) character of the pulse radiation phenomenon in the LWA structure. When the elements of a periodic CRLH LWA array are fed simultaneously by an input pulse, t...

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Journal of Applied Physics : Dielectric tunability of graded bariu...

By: M. B. Okatan, M. W. Cole, and S. P. Alpay

Description: A thermodynamic model was developed to analyze the effect of the difference in the thermal expansion coefficient (TEC) of a multilayered barium strontium titanate Ba1−ySryTiO3 (BST) ferroelectric heterostructure and a passive substrate on the dielectric properties by taking into account electrostatic and electromechanical interactions between the ferroelectric layers. Results show that the dielectric constant and tunability can be maximized by minimizing the...

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Journal of Applied Physics : Phase transformation sequence and mag...

By: X. Y. Xiong and T. R. Finlayson

Description: The phase transformation sequence, microstructure and compositions, and magnetic properties for a melt-spun Sm(Co0.68Fe0.2Cu0.1Zr0.02)7.5 alloy after isochronal heat treatments have been studied by using x-ray diffraction, transmission electron microscopy, three-dimensional atom probe (3DAP), and magnetometry. The as-spun ribbons had a single phase with the Cu7Tb structure. After being aged at 720 °C, the single phase decomposed into two major phases: 2:17R ...

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Physics of Fluids : Water bells created from below

By: Graeme J. Jameson, Claire Jenkins, Eleanor C. Button, and John E. Sader

Description:

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Biblioteca Hispanica : Natural and Moral History of the Indies

By: Jose De Acosta
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