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  • AIP Publishing  (7)
  • 2005-2009  (7)
  • 2005  (7)
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  • AIP Publishing  (7)
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  • 2005-2009  (7)
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  • 2005  (7)
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  • 1
    Online Resource
    Online Resource
    Raman study of electric-field-induced first-order metal-insulator transition in VO2-based devices
    AIP Publishing ; 2005
    In:  Applied Physics Letters Vol. 86, No. 24 ( 2005-06-13)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 86, No. 24 ( 2005-06-13)
    Abstract: An abrupt first-order metal-insulator transition (MIT) as a current jump has been observed by applying a dc electric field to Mott insulator VO2-based two-terminal devices. The size of the jumps was measured to be asymmetrical depending on the direction of the applied voltage due to heating effects. The structure of VO2 is investigated by micro-Raman scattering experiments. An analysis of the Raman-active Ag modes at 195 and 222cm−1, explained by pairing and tilting of V cations, and 622cm−1, shows that the modes below a low compliance (restricted) current do not change when the MIT occurs, whereas a structural phase transition above the low compliance current is found to occur secondarily, due to heating effects in the device induced by the MIT. The MIT has applications in the development of high-speed and high-gain switching devices.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.1941478
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2005
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Surface-detached V-shaped yoke of obliquely bonded magnetostrictive strips for high transduction of ultrasonic torsional waves
    AIP Publishing ; 2005
    In:  Applied Physics Letters Vol. 87, No. 22 ( 2005-11-28)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 87, No. 22 ( 2005-11-28)
    Abstract: When slender magnetostrictive strips that are obliquely bonded on the surface of a pipe are subjected to a time-varying magnetic field, the strips deform mechanically because of the magnetostrictive effect and in turn, ultrasonic torsional waves are generated in the pipe. If the magnetic flux density in the strips can be increased by simply modifying the magnetic path, the sensitivity of the generated wave signal with respect to the applied magnetic field strength can be considerably enhanced even without increasing the magnetic field strength. Sensitivity has been one of the most important factors in sensors. To achieve this objective, yokes can be used, but improper yoke configurations can generate unwanted additional wave modes with no sensitivity improvement. Consequently, the problem of an optimal yoke configuration to increase the sensitivity was formulated as a topology optimization problem, and an interesting V-shaped yoke was found to be the optimal configuration. When the designed yokes were employed in actual experiments, the sensitivity of the measured wave signal was increased by as much as 7.5 times without needing to increase the magnetic strength.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2133927
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2005
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Magnetic properties of YIG (Y3Fe5O12) thin films prepared by the post annealing of amorphous films deposited by rf-magnetron sputtering
    AIP Publishing ; 2005
    In:  Journal of Applied Physics Vol. 97, No. 10 ( 2005-05-15)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 97, No. 10 ( 2005-05-15)
    Abstract: We report magnetic properties of Y3Fe5O12 (YIG) films on thermally oxidized Si (100) and (Gd3Ga5O12) GGG (111) substrates. Amorphous YIG films with the cation ratio Y:Fe=3.04:4.96, deposited by rf-magnetron sputtering at room temperature in pure argon atmosphere, were crystallized by postannealing (600–900 °C) of amorphous films in air and in 500 ppm oxygen. While postannealed YIG films on GGG substrates were well textured, those on Si (100) were randomly oriented. High-quality YIG films could be better obtained in the reduced (500 ppm O2) oxygen atmosphere than air since more effective YIG growth during annealing process and lower FMR linewidth (ΔH) of films could be achieved.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.1855460
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2005
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Conditional filtering method for large-eddy simulation of turbulent nonpremixed combustion
    AIP Publishing ; 2005
    In:  Physics of Fluids Vol. 17, No. 10 ( 2005-10-01)
    Details
    In: Physics of Fluids, AIP Publishing, Vol. 17, No. 10 ( 2005-10-01)
    Abstract: The conditional filtering method is proposed as a subfilter combustion model for large-eddy simulation (LES) of turbulent nonpremixed combustion. The novel method is based on conditional filtering of a reactive scalar field and an extension of conditional moment closure (CMC) for LES. Filtering conditioned on isosurfaces of the mixture fraction is adopted to resolve small-scale mixing and chemical reactions in nonpremixed combustion. The conditionally filtered equations are derived and the closure assumptions are discussed. A priori tests are performed using direct numerical simulation data for reacting mixing layers. The primary closure assumption on the subfilter flux in mixture fraction space is shown to work much better than the corresponding closure for the Reynolds averaged CMC due to resolved large-scale fluctuations of the scalar dissipation rate and of reactive scalars. Results show that first-order closure of the reaction rate performs well except for the boundaries of flame holes. In the boundaries of flame holes, fluctuations of reactive scalars around the conditionally filtered values are large enough for the effects of higher-order correlations to be significant. The accuracy of the first-order closure is less sensitive to the level of local extinction than that of first-order CMC, since large-scale fluctuations of reactive scalars on isosurfaces of the mixture fraction are resolved. This shows that extinction processes occur primarily over length scales comparable to the large scales of the turbulence. The integrated conditional filtering approach is introduced to reduce the computational cost and to resolve the low probability problem in the conditional filtering method. While the assumption of homogeneity in the integration direction is not as good as in the conditional average, the integrated formulation is shown to represent the extinction process caused by large-scale fluctuations of the scalar dissipation rate quite well.
    Type of Medium: Online Resource
    ISSN: 1070-6631 , 1089-7666
    URL: Article
    DOI: 10.1063/1.2084229
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2005
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
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    Online Resource
  • 5
    Online Resource
    Online Resource
    Hydrated copper and gold monovalent cations: Ab initio study
    AIP Publishing ; 2005
    In:  The Journal of Chemical Physics Vol. 122, No. 6 ( 2005-02-08)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 122, No. 6 ( 2005-02-08)
    Abstract: To understand the hydration phenomena of noble transition metals, we investigated the structures, hydration energies, electronic properties, and spectra of the Cu+(H3O)1–6 and Au+(H2O)1–6 clusters using ab initio calculations. The coordination numbers of these clusters are found to be only two, which is highly contrasted to those of Ag+(H2O)n (which have the coordination numbers of 3–4) as well as the hydrated alkali metal ions (which have the coordination numbers of ∼6). For the possible identification of their interesting hydration structures, we predict their IR spectra for the OH stretch modes.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.1849134
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2005
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 6
    Online Resource
    Online Resource
    Discharge characteristics of plasma display panel with box-shaped apertures in transparent dielectric layer
    AIP Publishing ; 2005
    In:  Journal of Applied Physics Vol. 97, No. 7 ( 2005-04-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 97, No. 7 ( 2005-04-01)
    Abstract: This article presents an improved front panel structure for an alternating current plasma display panel (ac-PDP) based on a transparent dielectric layer with a box-shaped aperture between the sustain electrodes. The suggested structure can reduce driving voltages than conventional ac-PDPs due to a strong electric field between the sustain electrodes. Experiments were conducted with 10% and 20% Xe contents at a gas pressure of 450Torr, and the results confirmed that the structure with the box-shaped apertures reduced the firing and sustain voltages by about 83.6 and 45.2V than the conventional structure at 10% Xe content, respectively. Also, the proposed structure with a 20% Xe content improved the luminous efficiency and the luminance by about 21.2% and 19.7%, respectively, when compared to a conventional structure with a 10% Xe content at the same sustain voltage. In addition, the discharge and dynamic characteristics show that the suggested structure is very suitable for high-resolution plasma display panel.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.1879078
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2005
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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    Online Resource
  • 7
    Online Resource
    Online Resource
    Effects of the orientation of magnetostrictive nickel strip on torsional wave transduction efficiency of cylindrical waveguides
    AIP Publishing ; 2005
    In:  Applied Physics Letters Vol. 86, No. 24 ( 2005-06-13)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 86, No. 24 ( 2005-06-13)
    Abstract: Magnetostrictive transducers are receiving growing attention as an alternative to piezoelectric transducers in generating guided torsional waves in cylindrical waveguides. A recent study shows that torsional wave generation is possible if a set of thin magnetostrictive nickel strips are bonded to the surface of a cylindrical waveguide at an oblique angle and a combination of static and dynamic magnetic fields is applied to the strips. The objective of this work is to experimentally investigate the intriguing effects of the angle on the transduction efficiency and to provide a physical explanation for the observed phenomena. Excitation frequencies used for wave experiments were between 40 and 100 kHz, for which the highest transduction was observed.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.1948534
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2005
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
    Location Call Number Limitation Availability
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    Online Resource
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