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  • Articles  (108)
  • American Geophysical Union  (57)
  • Institute of Physics  (38)
  • American Institute of Physics (AIP)  (13)
  • 2020-2022  (33)
  • 1995-1999  (31)
  • 1985-1989  (44)
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  • Articles  (108)
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  • 1
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    Seismic Analysis of the 2020 Magna, Utah, Earthquake Sequence: Evidence for a Listric Wasatch Fault (2020)
    American Geophysical Union
    Details
    Publication Date: 2020-09-10
    Print ISSN: 0094-8276
    Electronic ISSN: 1944-8007
    Topics: Geosciences , Physics
    Published by American Geophysical Union
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    The interaction of researchers with teachers: What scientists can offer elementary and secondary schools (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 2605-2609 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Research scientists are engaged in a variety of programs to assist schools in teaching scientific principles by involving students and teachers in investigative processes. Scientists who want to assist in science education should understand the major reform efforts underway in the educational community. Current pedagogical practice has moved away from declarative science and into hands-on participation by students, in which they learn about science as a process. Scientists can help teachers ensure not only that curricular elements are technically accurate and current, but also that the elements represent the process of authentic science. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871223
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  • 3
    Electronic Resource
    Electronic Resource
    Wave propagation through cyclotron resonance in the presence of large Larmor radius particles (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 3702-3710 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Absorption of waves propagating across an inhomogenous magnetic field is of crucial importance for cyclotron resonance heating. When the Larmor radius of the resonant particles is small compared to the wavelength then the propagation is described by differential equations, a comparatively simple method for obtaining which has recently been given by Cairns et al. [Phys. Fluids B 3, 2953 (1991)]. In a fusion plasma there may, however, be a significant population of ions whose Larmor radius is not small compared to the wavelength. In this case the system is described by integro-differential equations, reflecting the fact that the plasma response at a given position is determined by the wave field over a region of width of the order of the Larmor radius. The simplified method referred to above is adapted to this case and used to obtain various forms of the equations. Methods of simplifying the equations while still retaining information from the non-local response, are discussed and some illustrated numerical results presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871070
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  • 4
    Electronic Resource
    Electronic Resource
    High performance silver ohmic contacts to YBa2Cu3O6+x superconductors (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 155-156 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Silver-YBa2Cu3O6+x superconductor ohmic contacts with specific contact resistance on the order of 10−8 Ω cm2 have been demonstrated. Alloying the contacts in O2 at 500 °C enhances the contact conductivity by two orders of magnitude.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99036
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  • 5
    Electronic Resource
    Electronic Resource
    Computation of fragment mass distributions for HF-1 steel explosive-filled cylinders (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 1223-1228 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Computations using a one-dimensional computer program have been performed to determine fragment mass distributions for exploding cylinders of HF-1 steel. Experiments were performed to guide the computations. Nucleation and growth models were used to simulate the brittle fracture and shear band damage that occurred in the metal cylinders prior to complete fragmentation. Material input parameters for these models have been previously determined. Computations were performed for two heat treatments of HF-1 steel. The calculated brittle crack and shear band distributions were converted to fragment mass distributions using one of the experimental fragment shapes. Based upon the experimental results, suggestions are made for future refinements in the area of fragmentation modeling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336140
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  • 6
    Electronic Resource
    Electronic Resource
    Cathodoluminescence scanning electron microscopy of semiconductors (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 1 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper reviews applications of cathodoluminescence scanning electron microscopy in the assessment of optical and electronic properties of semiconductors. The assessment includes, for example, information on band structure and impurity levels derived from spectroscopic cathodoluminescence, analysis of dopant concentrations at a level which is in some cases several orders of magnitude better than x-ray microanalysis, and mapping of carrier lifetimes and defects. Recent advances in both the various cathodoluminescence techniques and the processes leading to electron-beam-induced luminescence in semiconductors are reviewed. Possible future trends are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336491
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  • 7
    Electronic Resource
    Electronic Resource
    A new method for measuring liquid surface tension with acoustic levitation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 3349-3354 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new method utilizing an acoustic levitation technique is introduced to measure liquid surface tension. During the measurement a small drop of test liquid is acoustically levitated in air, and its static shape is gauged with the variation of its altitude location. The experimental data are matched with theoretical calculations giving an estimation of liquid surface tension. Due to its noncontact manipulation and requirement for a small amount of test sample, this method can be applied in many special situations. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145506
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  • 8
    Electronic Resource
    Electronic Resource
    The dynamics of ultrasonically levitated drops in an electric field (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 8 (1996), S. 43-61 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ultrasonic and electrostatic levitation techniques have allowed the experimental investigation of the nonlinear oscillatory dynamics of free droplets with diameter between 0.1 and 0.4 cm. The measurement of the resonance frequencies of the first three normal modes of large amplitude shape oscillations in an electric field of varying magnitude has been carried out with and without surface charges for weakly conducting liquids in air. These oscillations of nonspherical levitated drops have been driven by either modulating the ultrasonic field or by using a time-varying electric field, and the free decay from the oscillatory state has been recorded. A decrease in the resonance frequency of the driven fundamental quadrupole mode has been measured for increasing oblate deformation in the absence of an electric field. Similarly, a decrease in this frequency has also been found for increasing DC electric field magnitude. A soft nonlinearity exists in the amplitude dependence of the resonant mode frequencies for freely decaying as well as ultrasonically and electrically driven uncharged drops. This decrease in resonance frequency is accentuated by the presence of free surface charge on the drop. Subharmonic resonance excitation has been observed for drops in a time-varying electric field, and hysteresis exists for resonant modes driven to large amplitude. Mode coupling from lower-order resonances to higher-order modes has been found to be very weak, even for fairly large amplitude shape oscillations. Most of these results are in general agreement with predictions from recent analytical and numerical investigations. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868813
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  • 9
    Electronic Resource
    Electronic Resource
    Instability of a deformed liquid drop in an acoustic field (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 7 (1995), S. 2601-2607 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The flattening and breakup of an axially symmetric liquid drop in an acoustic standing wave field in air have been studied using a boundary integral method. The interaction between the drop and sound field are crucial to this approach. Our computations are focused on the threshold beyond which the drop loses its static equilibrium, and on the dynamic behavior after it loses its equilibrium up to the point when it breaks up. The numerical results are given in terms of drop size and the strength of sound field and are found to be in good agreement with the measurements of others. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868708
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  • 10
    Electronic Resource
    Electronic Resource
    Rotational dynamics of electronically excited aniline in solution from picosecond fluorescence anisotropies (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 5146-5155 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Ultraviolet fluorescence upconversion gating has been used to measure the fluorescence anisotropy of aniline in four hydrocarbon and alcoholic solvents. The deconvoluted anisotropy decay time of 1.2 ps in isopentane is only about a factor of 2 longer than calculated for free rotation of collision-free molecules, and increasing the solvent viscosity by a factor of 15 by going from isopentane to hexadecane increases the rotational relaxation time by only another factor of 2. These results imply that the orientational motion of electronically excited aniline in hydrocarbons may be significantly nondiffusive and that unhindered inertial rotation through large angles may be possible. The experimental anisotropy decays do, however, differ significantly from those calculated for completely unhindered free rotation. The anisotropy decays much more slowly in methanol and sec-butanol than in the hydrocarbons, presumably due to dipole–dipole and/or hydrogen bonding interactions in the hydroxylic solvents. The rotational relaxation of N,N-dimethylaniline is slower than that of aniline in hydrocarbon solvents but faster in methanol, perhaps reflecting reduced hydrogen bonding. Fluorescence anisotropy decays of 4-cyclohexylaniline and 2,4,6-tri-tert-butylaniline have also been examined in order to estimate the true initial rotationless anisotropy [r(0)] for aniline.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452635
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