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  • National Academy of Sciences  (3,053)
  • American Institute of Physics (AIP)  (2,602)
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  • 1
    Electronic Resource
    Electronic Resource
    Streaming vorticity flux from oscillating walls with finite amplitude (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 1933-1938 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: How to describe vorticity creation from a moving wall is a long standing problem. This paper discusses relevant issues at the fundamental level. First, it is shown that the concept of "vorticity flux due to wall acceleration'' can be best understood by following fluid particles on the wall rather than observing the flow at fixed spatial points. This is of crucial importance when the time-averaged flux is to be considered. The averaged flux has to be estimated in a wall-fixed frame of reference (in which there is no flux due to wall acceleration at all); or, if an inertial frame of reference is used, the generalized Lagrangian mean (GLM) also gives the same result. Then, for some simple but typical configurations, the time-averaged vorticity flux from a harmonically oscillating wall with finite amplitude is analyzed, without appealing to small perturbation. The main conclusion is that the wall oscillation will produce an additional mean vorticity flux (a fully nonlinear streaming effect), which is partially responsible for the mechanism of vortex flow control by waves. The results provide qualitative explanation for some experimentally and/or computationally observed phenomena.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858819
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis of the superconducting thin film of HgBa2Ca2Cu3O8+δ (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 1723-1725 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: HgBa2Ca2Cu3O8+δ (Hg-1223) superconducting thin films of about 0.3 μm in thickness have been successfully synthesized. The process involves depositing films (∼ 1 μm thickness) of Ba2Ca2Cu3Ox on a SrTiO3 substrate by pulse laser ablation technique and implanting mercury ions into this deposited film, followed by annealing at oxygen atmosphere. The films so obtained show a relatively wide superconducting transition temperature up to 118 K, as determined magnetically, which is similar to that of underdoping bulk Hg-1223. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.115887
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation of (100)-oriented metallic LaNiO3 thin films on Si substrates by radio frequency magnetron sputtering for the growth of textured Pb(Zr0.53Ti0.47)O3 (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 2643-2645 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Highly (100)-oriented LaNiO3(LNO) thin films were grown on Si, SiO2/Si, Pt/SiSiO2/Si, as well as glass substrates by rf magnetron sputtering deposition at substrate temperatures ranging from 150 to 500 °C. As-deposited LNO films are metallic; those prepared at substrate temperature ∼150–250 °C have a resistivity of 0.4–0.5 mΩ cm and can be used as the bottom electrode for the fabrication of integrated ferroelectric capacitors on Si. A subsequent deposition of sol-gel derived Pb(Zr0.53Ti0.47)O3 (PZT) thin film on the LNO-coated substrate was also found to have a significant (100)- and (001)-oriented texture. The ferroelectric capacitor fabricated from these films displays a good P–E hysteresis characteristic. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.113111
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  • 4
    Electronic Resource
    Electronic Resource
    Observation of systematic deviations of period in W/Si and W/C multilayers (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 5331-5334 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Cross-sectional transmission electron microscopy, selected area electron diffraction, and small-angle x-ray diffraction have been used to observe the systematic deviations of period in W/Si and W/C multilayers. The mean periods decreased gradually as the detected regions were located farther away from the substrate. To avoid destroying the multilayer, a method is suggested to measure the systematic deviation of period by using soft x rays with wavelengths below and above an absorption edge and hard x rays such as Cu Kα1. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359711
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  • 5
    Electronic Resource
    Electronic Resource
    Crystallization behavior of a mechanically alloyed amorphous Fe80Zr8B11Cu1 alloy : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5473-5475 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An amorphous alloy of Fe80Zr8B11Cu1 has been prepared by mechanical alloying, milled for 72 h, and annealed in the temperature range from 673 to 1173 K. The crystallization behavior of this sample at different annealing temperatures has been investigated by x-ray diffractometry, electron microscopy, and Mössbauer spectroscopy. With the increase of annealing temperature, about a 15 nm bcc phase is formed in the amorphous base. Upon further increasing the annealing temperature to 1173 K, in addition to the metastable α -Fe (Zr,B) phase, a ZrB2 phase appears. Furthermore, the results from Mössbauer spectroscopy reveal that there are two different magnetic areas in these amorphous phases at different annealing temperatures. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362279
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  • 6
    Electronic Resource
    Electronic Resource
    Annealing behavior of Pd/a-Ge bilayer films (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 2415-2417 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Solid-state reaction and crystallization in Pd/a-Ge bilayer films of various ratios of thickness (or composition) after annealing have been investigated by transmission electron microscopy. Besides polycrystalline Pd and amorphous Ge, the Pd2Ge phase is formed in as-evaporated films with 54 and 67 at % of Ge. During annealing at 250 °C Pd2Ge and PdGe are formed. During annealing at 350 °C, besides the formation of Pd2Ge and PdGe, crystallization of amorphous Ge takes place, inducing fractal-like structures with a size of about 1 μm. The fractal dimension varies from 1.60 to 1.88, depending on the composition of the films. The fractal formation can be explained by a random successive nucleation model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356263
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  • 7
    Electronic Resource
    Electronic Resource
    New development of nonlinear optical crystals for the ultraviolet region with molecular engineering approach (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 2268-2272 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Potassium fluoroboratoberyllate KBe2BO3F2 (KBBF) has been revealed theoretically and experimentally as a novel ultraviolet nonlinear optical crystal, but it is found to be very difficult to grow in a large size, because of the weak binding interaction between the (Be2BO3)∞ units, which leads to an apparent layer habit in the growth. By using a molecular engineering approach, oxygen bridges when brought in to strengthen the binding between the infinite units are found to be useful to overcome the above shortcoming of KBBF, and in the light of it another new ultraviolet nonlinear optical crystal—strontium boratoberyllate Sr2Be2B2O7 (SBBO) has been discovered. The linear optical properties of SBBO are similar to KBBF's, but its nonlinear optical properties are better than that of the latter. d22(SBBO)(approximately-equal-to)d22(β-BaB2O4), which is two times higher than d11 of KBBF. SBBO has very good mechanical properties, and it is also not deliquescent. So SBBO is expected to have great potential for the application in ultraviolet nonlinear optical devices. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358814
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  • 8
    Electronic Resource
    Electronic Resource
    Anomalous mobility enhancement in heavily carbon-doped GaAs (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5453-5455 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An anomalous mobility enhancement and metallic-type conductivity were observed in heavily carbon-doped GaAs grown by low-pressure metalorganic chemical vapor deposition. The 77 K mobility was slightly lower than that of 300 K for hole concentration between 1×1018 and 4×1018 cm−3. However, the 77 K mobility was enhanced from p(approximately-greater-than)4×1018 cm−3, and the 300 K mobility slowly decreased with increasing hole concentration that ranged from 7×1018 to 3×1019 cm−3. As a result, the 77 K mobility was around 50%–60% greater than the 300 K mobility due to the metallic-type conductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355706
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  • 9
    Electronic Resource
    Electronic Resource
    High-speed liquid-crystal modulators using transient nematic effect (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 527-532 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The transient nematic effect, together with multiple pass technique and optimal temperature effect, was employed to demonstrate high-speed liquid-crystal modulators. As a result, nematic liquid-crystal modulators with frame time less than 50 μs have been achieved in the visible spectral region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343135
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  • 10
    Electronic Resource
    Electronic Resource
    Hysteresis loop of planar Hall effect in CoCr films (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5795-5797 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Micrometer devices of Co85Cr15 film with Hall bar shape were made using standard electron beam lithography and lift-off process. The film was thermally deposited without bias field and the sample was kept at room temperature during evaporation. The Hall voltage, measured at room temperature, showed square hysteresis loops with an external magnetic field applied in the direction close to the film plane. Based on the variation of the Hall voltage measured under different directions of external magnetic field, the magnetic easy axis was verified to be along the long axis of the device. The formation of the easy axis along the narrow wire due to the physical confinement as an intrinsic mechanism is discussed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369922
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