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  • 1
    Electronic Resource
    Electronic Resource
    Critical current in a spin injection device (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 7502-7504 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on direct evidence of the suppression of critical current due to pair-breaking in a superconducting microbridge when the measurement is carried out by injecting spin-polarized carriers instead of normal electrons. A thin layer of La0.7Ca0.3MnO3 was used as the source of spin-polarized carriers. The microbridge was formed on the DyBa2Cu3O7−δ thin film by photolithographic techniques. The design of our spin-injection device allowed us to inject spin-polarized carriers from the La0.7Ca0.3MnO3 layer directly to the DyBa2Cu3O7−δ microbridge (without any insulating buffer layer) making it possible to measure the critical current when polarized electrons alone are injected into the superconductor. Our results confirm the role of polarized carriers in breaking the Cooper pairs in the superconductor. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1356048
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  • 2
    Electronic Resource
    Electronic Resource
    Nonlinear properties of small amplitude dust ion acoustic solitary waves (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 3594-3599 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this paper some nonlinear characteristics of small amplitude dust ion acoustic solitary wave in three component dusty plasma consisting of electrons, ions, and dust grains have been studied. Simultaneously, the charge fluctuation dynamics of the dust grains under the assumption that the dust charging time scale is much smaller than the dust hydrodynamic time scale has been considered here. The ion dust collision has also been incorporated. It has been seen that a damped Korteweg–de Vries (KdV) equation governs the nonlinear dust ion acoustic wave. The damping arises due to ion dust collision, under the assumption that the ion hydrodynamical time scale is much smaller than that of the ion dust collision. Numerical investigations reveal that the dust ion acoustic wave admits only a positive potential, i.e., compressive soliton. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1287140
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  • 3
    Electronic Resource
    Electronic Resource
    Molecular clusters and correlations in liquid methanol at room temperature (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 2032-2039 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The analysis of x-ray diffraction data of liquid methanol at room temperature reveals a distinct possibility of the presence of hexamer molecular clusters due to intermolecular hydrogen bonding. On the assumption of hexamer domination in the structure, the center structure is derived, which in turn reproduces closely the available data on neutron diffraction and computer simulation for this system. The center–center correlations show special features of bonded structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465266
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  • 4
    Electronic Resource
    Electronic Resource
    Generation of poloidal magnetic field in a hot collisional plasma by inverse Faraday effect (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 1495-1501 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Generation of poloidal magnetic field in a hot and collisional plasma by an inverse Faraday effect is discussed. This field can either be induced by a circularly polarized laser beam (CPLB) or a plane-polarized laser beam (PPLB). For the CPLB, an average field 〈ℜx〉∼I0λ∼11.6 MG could be produced in a DT plasma for a high intensity (I0=1022 W/m2) and shorter wavelength (λ=0.35 μm) laser. This field is essentially induced by the field inhomogeneity effect and dominates over that induced by the plasma inhomogeneity effect (〈ℜx〉∼I2/30λ7/3∼2.42 MG). The collisional and thermal contribution to 〈ℜx〉 is just negligible for the CPLB. However, in the case of PPLB the poloidal field is generated only for a hot and collisional plasma and can be quite large for a longer wavelength laser (e.g., CO2 laser, λ=10.6 μm). The collisional effect induces a field 〈ℜx〉∼0.08 kG, which dominates near the turning point and is independent of the laser parameters. However, in the outer cronal region the thermal pressure effect dominates (e.g., 〈ℜx〉∼I5/30λ4/3∼3.0 MG). Further, 〈ℜx〉 for the p-polarized beam is, in general, relatively smaller than that for the s-polarized beam. Practical implications of these results and their limitations are discussed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872010
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  • 5
    Electronic Resource
    Electronic Resource
    Calculations of high-frequency response of two-dimensional hot electrons in GaAs quantum wells (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 283-287 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Small-signal ac mobility of two-dimensional (2D) degenerate hot electrons in a GaAs square quantum well is studied on a heated drifted Fermi–Dirac distribution function for the carriers. Carrier energy loss via longitudinal optic (LO) phonons, and the momenta losses via LO, acoustic and ionized impurity scatterings are considered. The ac mobility is found to drop off with frequency beyond 100 GHz although the drift velocity starts to lag behind the applied field at a lower frequency. The ac mobility μac and the phase angle φ increase with the rise of the channel width and the 2D carrier concentration. However, the 3-dB cut-off frequency f3 dB is found to decrease with increasing channel width. The values of μac and f3dB are higher but those of φ are lower at 300 K than that at 77 K. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360671
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  • 6
    Electronic Resource
    Electronic Resource
    A subgrid model for nonlinear functions of a scalar (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 13 (2001), S. 3803-3819 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In applications of large eddy simulation of turbulent flows, subgrid models are often required for closure of strongly nonlinear functions of a scalar. The Arrhenius dependence of the reaction rate on temperature, T, the T4 dependence of radiation heat transfer, as well as the species mass fractions and temperature dependence on the mixture fraction in solutions of the strained laminar flamelet model are among some of the problems of interest. A moment-based reconstruction methodology is proposed here in which the scalar field is estimated by an approximate deconvolution operation but, unlike the usual deconvolution operation with given coefficients, the coefficients in the expansion are obtained by requiring that the statistical filtered moments of the scalar field up to a certain order are matched. The estimated scalar field is then used as a surrogate for the exact scalar field to directly calculate the subgrid contribution. Tests of the proposed approach are performed by using our direct numerical simulation database of scalar transport in a turbulent shear layer using two filter sizes: 12 points and 6 points per vorticity thickness. It is found that a simple moment-based model with one coefficient performs well for polynomial nonlinearities. The performance of the model in the case of an exponential Arrhenius-type nonlinearity is generally good and can be very good depending on the stoichiometric mixture fraction and the filter size. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1410385
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  • 7
    Electronic Resource
    Electronic Resource
    The pressure–dilatation correlation in compressible flows (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 2674-2682 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Simulations of simple compressible flows have been performed to enable the direct estimation of the pressure–dilatation correlation. The generally accepted belief that this correlation may be important in high-speed flows has been verified by the simulations. The pressure–dilatation correlation is theoretically investigated by considering the equation for fluctuating pressure in an arbitrary compressible flow. This leads to the isolation of a component of the pressure–dilatation that exhibits temporal oscillations on a fast time scale. Direct numerical simulations of homogeneous shear turbulence and isotropic turbulence show that this fast component has a negligible contribution to the evolution of turbulent kinetic energy. Then, an analysis for the case of homogeneous turbulence is performed to obtain a formal solution for the nonoscillatory pressure–dilatation. Simplifications lead to a model that algebraically relates the pressure–dilatation to quantities traditionally obtained in incompressible turbulence closures. The model is validated by direct comparison with the simulations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858454
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  • 8
    Electronic Resource
    Electronic Resource
    Molecular clusters in liquid ethanol at room temperature (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 5118-5122 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The analysis of x-ray diffraction data of liquid ethanol at room temperature shows the existence of hexamer molecular clusters due to intermolecular hydrogen bonding. Assuming hexamer domination in the intermolecular structure, the center structure is derived, which in turn reproduces closely the available data on neutron diffraction for this system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467177
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  • 9
    Electronic Resource
    Electronic Resource
    Statistical analysis of the rate of strain tensor in compressible homogeneous turbulence (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 3240-3254 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recent analysis of direct numerical simulations of compressible homogeneous shear flow turbulence has unraveled some of the energy transfer mechanisms responsible for the decrease of kinetic energy growth when the flow becomes more compressible. In this complementary study, attention is focused on the rate of strain tensor. A Helmholtz decomposition of the velocity field leads to a consideration of a solenoidal and an irrotational rate of strain tensor. Their eigenvalue distributions, eigenvector orientations, and the relative alignment between the eigenvectors and the vorticity and pressure gradient vectors are examined with the use of probability density functions. The irrotational rate of strain tensor is found to have a preferred structure in regions of strong dilatation. This structure depends on the mean shear, and is quite different from that of the solenoidal rate of strain tensor. Compressibility strongly affects the orientation properties of the pressure gradient vector.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858681
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  • 10
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    Nature of electron correlation and hybridization in NixCu1−xMnSb Heusler alloys (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-08-05
    Description: The electronic structure of Heusler alloys having mixed magnetic phases, comprising of vicinal anti-ferromagnetic and ferromagnetic orders, is of great significance. We present the results of an electronic structure study on Ni x Cu 1− x MnSb Heusler alloys, using Mn-2p core-level photoemission spectroscopy. Room temperature data in the paramagnetic phase reveal a non-monotonic variation of both electron correlation strength and conduction-band hybridization such that the former enhances while the latter weakens for compositions showing a mixed phase relative to compositions at the phase boundaries to the ordered phases. The results suggest a possible electronic driving force for settling mixed-magnetic phases.
    Electronic ISSN: 2166-532X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by American Institute of Physics (AIP)
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