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Physics of Fluids : Introduction: 25th Annual Gallery of Fluid Mot...

By: Todd B. Harman

Description:

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Biblioteca Hispanica : the Earth and Its Inhabitants Basic Knowled...

By: Jaime Rise and Nicolau
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Applied Physics Letters : Ferromagnetic structurally disordered Zn...

By: K. Potzger, Shengqiang Zhou, Qingyu Xu, A. Shalimov, R. Groetzschel et al

Description: We present superparamagnetic clusters of structurally highly disordered Co–Zn–O created by high fluence Co ion implantation into ZnO (0001) single crystals at low temperatures. This secondary phase cannot be detected by common x-ray diffraction but is observed by high-resolution transmission electron microscopy. In contrast to many other secondary phases in a ZnO matrix, it induces low-field anomalous Hall effect and is thus a candidate for magnetoelectronics applications.

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Physics of Plasmas : Toroidal self-consistent modeling of drift ki...

By: Yueqiang Liu, M. S. Chu, I. T. Chapman, and T. C. Hender

Description: A self-consistent kinetic model is developed to study the stability of the resistive wall mode in toroidal plasmas. This model is compared with other models based on perturbative approaches. The degree of the kinetic modification to the stability of the mode depends on the plasma configurations. Both stabilizing and destabilizing kinetic effects are observed. The nonperturbative approach, with a self-consistent inclusion of the eigenfunctions and the eigenva...

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Applied Physics Letters : Temperature distribution and modificatio...

By: Masaaki Sakakura, Masahiro Shimizu, Yasuhiko Shimotsuma, Kiyotaka Miura, and Kazuyuki Hirao

Description: Heat accumulation by high repetition rate femtosecond laser irradiation inside glass generates a much larger modification than that by a single pulse. In this study, we determined the temperature distribution due to heat accumulation and the characteristic temperature for heat modification inside a soda lime glass by analyzing the relationship between the radius of modification and glass temperature. The validity of the analysis was confirmed by reproducing ...

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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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The Journal of Chemical Physics : Precision shooting: Sampling lon...

By: Michael Grünwald, Christoph Dellago, and Phillip L. Geissler

Description: The kinetics of collective rearrangements in solution, such as protein folding and nanocrystal phase transitions, often involve free energy barriers that are both long and rough. Applying methods of transition path sampling to harvest simulated trajectories that exemplify such processes is typically made difficult by a very low acceptance rate for newly generated trajectories. We address this problem by introducing a new generation algorithm based on the lin...

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Physics of Plasmas : An interpolation formula for the ion flux to ...

By: S. A. Khrapak and G. E. Morfill

Description: Ion collisionality is known to be a major factor which determines the magnitude of the surface (floating) potential of an individual particle immersed in a plasma. In this paper a simple interpolation formula for the ion flux collected by such a particle in the entire range of ion collisionality is proposed. The dependency of the floating potential on ion collisionality calculated using this formula as well as using other analytic approximations developed re...

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Review of Scientific Instruments : Single-sided radio-frequency fi...

By: Laouès Guendouz, Sébastien Leclerc, Alain Retournard, Ahcène Hedjiedj, and Daniel Canet

Description: Magnetic field gradients are nowadays indispensable to most nuclear magnetic resonance experiments and are at the basis of magnetic resonance imaging (MRI). Most of the time, gradients of the static magnetic field are employed. Gradients of the radio-frequency (rf) field may constitute an interesting alternative. Until now, they were produced by a single loop. We demonstrate in this paper how two unsymmetrical series loops can be optimized to produce rf grad...

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Biblioteca Hispanica : Practices of Natural History

By: Federico Luzuriaga and Aguirre
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Chaos : Comment on Synchronization of chaotic systems with delay u...

By: Yinping Zhang and Qing-Guo Wang

Description: In the referenced paper, there is technical carelessness in the third lemma and in the main result. Hence, it is a possible failure when the result is used to design the intermittent linear state feedback controller for exponential synchronization of two chaotic delayed systems.

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Review of Scientific Instruments : Nanoscale lithography with freq...

By: Masayuki Hamada, T. Eguchi, K. Akiyama, and Y. Hasegawa

Description: A lithographic method to draw nanoscale structures by repetitive depositions of the tip material by field evaporation has been developed based on frequency-modulation atomic force microscopy (FM-AFM). Because of high stiffness of quartz tuning forks, a force sensor in the AFM, unwanted mechanical contact of the AFM tip with the substrate was prevented. Precise control of the tip-substrate gap distance with FM-AFM and a gold tip sharpened with focused ion bea...

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Physics of Fluids : Magnetohydrodynamic turbulence in a channel wi...

By: Dmitry Krasnov, Oleg Zikanov, Jörg Schumacher, and Thomas Boeck

Description: The effect of a uniform spanwise magnetic field on a turbulent channel flow is investigated for the case of a low magnetic Reynolds number. Direct numerical simulation (DNS) and large eddy simulation (LES) computations are performed for two values of the hydrodynamic Reynolds number (104 and 2×104) and with the Hartmann number varying in a wide range. It is shown that the main effect of the magnetic field is the suppression of turbulent velocity fluctuations...

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Chaos : Global dissipativity analysis on uncertain neural networks...

By: Qiankun Song and Jinde Cao

Description: In this paper, the problems of global dissipativity and global exponential dissipativity are investigated for uncertain neural networks with discrete time-varying delay and distributed time-varying delay as well as general activation functions. By constructing appropriate Lyapunov–Krasovskii functionals and employing Newton–Leibniz formulation and linear matrix inequality (LMI) technique, several new criteria for checking the global dissipativity and global ...

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Physics of Plasmas : Doppler spectroscopy of hydrogen Balmer lines...

By: N. M. Šišovic and N. Konjevic

Description: The results of Doppler spectroscopy of hydrogen Balmer lines from a stainless steel (SS) and copper (Cu) hollow cathode (HC) glow discharge in ammonia and argon-ammonia mixture are reported. The experimental profiles in ammonia discharge are fitted well by superposing three Gaussian profiles. The half widths, in energy units, of narrow and medium Gaussians are in the ranges 0.3–0.4 eV and 3–4 eV, respectively, for both hollow cathodes what is expected on the...

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Journal of Physical and Chemical Reference Data : IUPAC-NIST Solub...

By: Tomasz Mioduskia; Cezary Gumiński and Dewen Zeng

Description: This volume presents solubility data for rare earth metal chlorides in water and in ternary and quaternary aqueous systems. The material is divided into three parts: scandium group (Sc, Y, La )light lanthanide (Ce-Eu), and heavy lanthanide (Gd-Lu) chlorides; this part covers the scandium group. Compilations of all available experimental data are introduced for each rare earth metal chloride with a corresponding critical evaluation. Every such evaluation cont...

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Physics of Plasmas : Toroidal equilibria in spherical coordinates

By: K. H. Tsui

Description: The standard Grad–Shafranov equation for axisymmetric toroidal plasma equilibrium is customary expressed in cylindrical coordinates with toroidal contours, and through which benchmark equilibria are solved. An alternative approach to cast the Grad–Shafranov equation in spherical coordinates is presented. This equation, in spherical coordinates, is examined for toroidal solutions to describe low β Solovev and high β plasma equilibria in terms of elementary functions.

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The Journal of Chemical Physics : Optimized effective potentials f...

By: Tim Heaton-Burgess and Weitao Yang

Description: We investigate the use of a regularized optimized effective potential (OEP) energy functional and L-curve procedure [ T. Heaton-Burgess, F. A. Bulat, and W. Yang, Phys. Rev. Lett. 98, 256401 (2007) ] for determining physically meaningful OEPs from arbitrary combinations of finite orbital and potential basis sets. The important issue of the manner in which the optimal regularization parameter is determined from the L-curve perspective is reconsidered with the...

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Applied Physics Letters : Terahertz generation in multiple laser-i...

By: Meng-Ku Chen, Jae Hun Kim, Chia-En Yang, Stuart Shizhuo Yin, Rongqing Hui et al

Description: An investigation of the terahertz wave generation in multiple laser-induced air plasmas is presented. First, it is demonstrated that the intensity of the terahertz wave increases as the number of air plasmas increases. Second, the physical mechanism of this enhancement effect of the terahertz generation is studied by quantitatively measuring the intensity of the generated terahertz wave as a function of phase difference between adjacent air plasmas. It is fo...

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Review of Scientific Instruments : Bubble velocity, diameter, and ...

By: Ho-Joon Lim, Kuang-An Chang, Chin B. Su, and Chi-Yueh Chen

Description: A fiber optic reflectometer (FOR) technique featuring a single fiber probe is investigated for its feasibility of measuring the bubble velocity, diameter, and void fraction in a multiphase flow. The method is based on the interference of the scattered signal from the bubble surface with the Fresnel reflection signal from the tip of the optical fiber. Void fraction is obtained with a high accuracy if an appropriate correction is applied to compensate the unde...

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