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Journal of Mathematical Physics : Unitary isomorphism of Fock spac...

By: Katsunori Kawamura

Description: Bosons and fermions are described by using canonical generators of Cuntz algebras on any permutative representation. According to branching laws associated with these descriptions, a certain representation of the Cuntz algebra O2 induces Fock representations HB and HF of bosons and fermions simultaneously. From this, a unitary operator U from HB to HF is obtained. We show the explicit formula of the action of U on the standard basis of HB. It is shown that U...

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Biblioteca Hispanica : Paintings of Natural 1894

By: Joseph Albinana
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Journal of Applied Physics : Reduced bound exciton and surface exc...

By: Y. Z. Zhang, H. P. He, Y. Z. Jin, B. H. Zhao, Z. Z. Ye et al

Description: Temperature-dependent photoluminescence (PL) spectroscopy is employed to investigate the effects of exposure to ambient air on the optical property of Al-doped ZnO nanorods. Low temperature PL of the as-grown nanorods shows dominant D0X (excitons bound to neutral donors) emission at 3.363 eV and surface state-related emission at 3.310 eV. After exposure to ambient air, both of them vanish and the first LO phonon replica of free exciton is observed instead. I...

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Chaos : Momentum distributions after double ionization

By: B. Eckhardt, J. Prauzner-Bechcicki, K. Sacha, and J. Zakrzewski

Description:

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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 : 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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Physics of Plasmas : Stabilizing of low frequency oscillation in H...

By: Daren Yu, Chunsheng Wang, Liqiu Wei, Chao Gao, and Guang Yu

Description: Numerical simulations and experiments have been conducted to investigate the effects of a filter on low frequency oscillation in Hall thrusters. With one-dimensional quasineutral hydrodynamic model, the effects of filter components are studied by way of simulation computations. The simulation results show that with proper filter parameters, low frequency oscillation can be stabilized. Further, an eigenvalue study of the linear stability has been performed an...

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Journal of Applied Physics : Fluctuation-induced conductivity of p...

By: Najmul Hassan and Nawazish A. Khan

Description: The fluctuation-induced conductivity of Ni free and Ni doped Cu0.5Tl0.5Ba2Ca2Cu3−yNiyO10−δ (y = 0, 0.5, 1.0, 1.5) samples is investigated for comparison of dimensionality of fluctuations above the mean-field critical temperature. The temperature dependence of paraconductivity can be described by a power law following Aslamazov–Larkin (AL) type equations for these polycrystalline superconductors. It is observed from these studies that at higher temperatures, ...

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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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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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The Journal of Chemical Physics : Photodissociation dynamics of me...

By: Shih-Huang Lee

Description: We investigated the photodissociation dynamics of methyl formate-d (CH3OC(O)D) at 193.3 nm in a molecular-beam apparatus using undulator radiation as an ionization source. We measured kinetic-energy distributions, spatial angular anisotropies, and branching ratios of all photofragments. Fractions of energy release into product translation were calculated from the kinetic-energy distributions. Four primary dissociation pathways to asymptotes CH3O( 2E)+DCO( 2A...

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Physics of Fluids : Natural convection in enclosures with partiall...

By: P. Kandaswamy, N. Nithyadevi, and C. O. Ng

Description: Unsteady laminar natural convection in an enclosure with partially thermally active side walls and internal heat generation is studied numerically. Thermally inactive parts of the side walls and horizontal walls are thermally insulated. The governing equations are solved using the control volume method with a power law scheme. Nine different combinations of the hot and cold thermally active zones are considered. The effects of heat generations, aspect ratios...

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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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Physics of Fluids : Spilling breakers and surfactants

By: Xinan Liu, James D. Diorio, and James H. Duncan

Description:

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Journal of Applied Physics : Characteristics of amorphous Ag0.1(Ge...

By: Ki-Ho Song, Sung-Won Kim, Jae-Hee Seo, and Hyun-Yong Lee

Description: An amorphous chalcogenide Ge2Sb2Te5 film is most commonly used for phase-change data storage, in which its small volume is switched between amorphous and crystalline states by local heating with short laser or current pulses. A speed of amorphous-to-crystalline phase transformation in Ge2Sb2Te5 and Ag0.1(Ge2Sb2Te5)0.9 films has been evaluated on a nanosecond time scale using a 658-nm laser beam. The focused laser beam with a diameter <10 μm was illuminated i...

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Physics of Fluids : Rupture of radially spreading liquid films

By: Rajeev Dhiman and Sanjeev Chandra

Description: The rupture of thin water films (thickness of ∼ 100 μm) spreading radially outward on a solid surface was studied experimentally. Circular water films were produced by directing a 1 mm diameter water jet onto a flat horizontal plate for 10 ms. Jet impact velocity was varied from 1.6 to 6.1 m/s, giving Reynolds numbers from 1600 to 6100. Three different plates were used (glass, Plexiglas, and wax) to vary substrate wettability. Both rough and smooth wax surfa...

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Biblioteca Hispanica : Natural Science, Applied to Commerce, Indus...

By: Sunday Miguel
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Journal of Applied Physics : Spectroscopic determination of electr...

By: J. E. Maslar, W. S. Hurst, and C. A. Wang

Description: Phonon-plasmon coupled mode Raman spectra of n-type GaSb were measured at room temperature as a function of electron concentration. These spectra were obtained using an optical system based on 752.55 nm excitation. Utilization of this wavelength permits greater sensitivity to GaSb coupled mode Raman scattering over a wider doping range than is possible with visible wavelength excitation-based systems. A relatively simple spectral model for the electronic con...

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Review of Scientific Instruments : Design and characterization of ...

By: Gautam Sinha and Gurnam Singh

Description: This paper presents the design and analysis of a multipurpose combined function magnet for use in accelerators. This magnet consists of three corrector magnets: (i) skew quadrupole, (ii) horizontal dipole, and (iii) vertical dipole magnets, along with the main sextupole magnet. The strength of the corrector magnets is smaller than that of the main sextupole magnet. The strength of all the four magnets can be varied independently. The excitation strength requ...

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Physics of Fluids : Experimental investigation of turbulent diffus...

By: Balaji Gopalan, Edwin Malkiel, and Joseph Katz

Description: High-speed inline digital holographic cinematography is used for studying turbulent diffusion of slightly buoyant 0.5–1.2 mm diameter diesel droplets and 50 μm diameter neutral density particles. Experiments are performed in a 50×50×70 mm3 sample volume in a controlled, nearly isotropic turbulence facility, which is characterized by two dimensional particle image velocimetry. An automated tracking program has been used for measuring velocity time history of ...

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