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  • American Institute of Physics (AIP)  (81)
  • Springer Nature  (49)
  • Oxford University Press  (40)
  • 2010-2014  (87)
  • 1995-1999  (36)
  • 1990-1994  (43)
  • 1935-1939
  • 1930-1934  (4)
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Year
  • 11
    Electronic Resource
    Electronic Resource
    Thermodynamic properties of fluid helium at high pressures determined from speeds of sound (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 6163-6166 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The equation of state and heat capacity of fluid helium have been determined at temperatures from 98.15 to 298.15 K and at pressures from 100 to 1000 MPa using a new computational method. This is based on stepwise construction of ρT isobars starting from an experimental reference pρ isotherm and using the previously reported sound speed data of helium as a function of pressure and temperature. In the region of overlap, the calculated equation-of-state data show significant discrepancies from those obtained previously with direct measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462659
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  • 12
    Electronic Resource
    Electronic Resource
    Molecular dynamics simulation of a dense model bilayer of chain molecules with fixed head groups (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 5377-5386 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Molecular dynamics (MD) simulations have been performed on a model bilayer of 48 chain molecules with fixed head groups and periodic boundary conditions in the lateral direction. The effects of packing density and temperature on the extent of spatial and temporal correlations in the ensemble have been studied by analyzing the trajectories from the MD simulations. Quantities such as order parameters, number density contours, trans–gauche statistics and structure factors are evaluated as a function of distance from the plane containing the constrained head groups. The ensemble having the smallest area of 20.625 A(ring)2/molecule can be characterized as having three dimensional order, even at high temperatures, with a few gauche defects. Decreasing the packing density of the chains results in the increase of the number of gauche defects, especially at the chain extremities along with a decrease in the extent of spatial and temporal correlations. Interestingly, shorter interchain spacings are evident in the middle of the layer which can be attributed to clusters of chains lying alongside less dense domains. At temperatures lower than 300 K, the ensemble having the largest area of 26.125 A(ring)2/molecule reveals a rather complex interplay between chains wherein the lateral arrangement of the methylene units across the layer is transient and varies as a function of distance from the plane of the head groups. At temperatures higher than 300 K, thermal motion increases chain separation which effectively suppresses cluster formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461653
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  • 13
    Electronic Resource
    Electronic Resource
    Path integral description of polymers using fractional Brownian walks (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 9230-9236 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The statistical properties of fractional Brownian walks are used to construct a path integral representation of the conformations of polymers with different degrees of bond correlation. We specifically derive an expression for the distribution function of the chains' end-to-end distance, and evaluate it by several independent methods, including direct evaluation of the discrete limit of the path integral, decomposition into normal modes, and solution of a partial differential equation. The distribution function is found to be Gaussian in the spatial coordinates of the monomer positions, as in the random walk description of the chain, but the contour variables, which specify the location of the monomer along the chain backbone, now depend on an index h, the degree of correlation of the fractional Brownian walk. The special case of h=1/2 corresponds to the random walk. In constructing the normal mode picture of the chain, we conjecture the existence of a theorem regarding the zeros of the Bessel function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465539
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  • 14
    Electronic Resource
    Electronic Resource
    Modified stepwise expansion method for the measurement of compressibility isotherms of gases up to 10 kbar (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 1153-1154 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The stepwise expansion method for the measurement of compressibility isotherms of gases, developed recently in this laboratory, has been modified in order to measure those gases for which only low-pressure fiducial density data are available. The modified method has been tested with CH4 as a measuring gas at 298.15 K and up to 9.9 kbar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141440
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  • 15
    Electronic Resource
    Electronic Resource
    Stochastic quantization of para-Fermi fields (1990)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 31 (1990), S. 156-163 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The application of the method of stochastic quantization originally attributed to Parisi and Wu has been extended to spinor fields obeying para-Fermi statistics. The connection between Euclidean and stochastic field theories is established in the conventional manner by proving the equivalence between a Langevin equation satisfied by para-Grassmann fields and a Fokker–Planck equation, the Hamiltonian of which has been constructed using para-Grassmann variables analogous to its construction from Grassmann variables in the Fermi case. As an example, a two-point Green function is calculated for any arbitrary value of order p of para-Fermi statistics, barring the pathological case p=2 which has been mentioned briefly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.528854
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  • 16
    Electronic Resource
    Electronic Resource
    Two-dimensional mapping of the plasma density in the upper atmosphere with computerized ionospheric tomography (CIT) : The 39th annual meeting of division of plasma physics of APS (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 2010-2021 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Tomographic imaging of the ionosphere is a recently developed technique that uses integrated measurements and computer reconstructions to determine electron densities. The integral of electron density along vertical or oblique paths is obtained with radio transmissions from low-earth-orbiting (LEO) satellite transmitters to a chain of receivers on the earth's surface. Similar measurements along horizontal paths can be made using transmissions from Global Position System (GPS) navigation satellites to GPS receivers on LEO spacecraft. Also, the intensities of extreme ultraviolet (EUV) emissions can be measured with orbiting spectrometers. These intensities are directly related to the integral of the oxygen ion and electron densities along the instrument line of sight. Two-dimensional maps of the ionospheric plasma are produced by analyzing the combined radio and EUV data using computerized ionospheric tomography (CIT). Difficulties associated with CIT arise from the nonuniqueness of the reconstructions, owing to limited angle measurements or nonoptimal receiver location. Improvements in both reconstruction algorithms and CIT measurement systems are being implemented to overcome these difficulties. New imaging systems being developed employ CIT for large area mapping of the plasma densities in the ionosphere. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872872
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  • 17
    Electronic Resource
    Electronic Resource
    High repetition rate operation of a rotating dielectric spark gap (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 3590-3591 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The reliable operation of a spark gap at 300 Hz pulse repetition frequency by rotating a suitably configured dielectric plate between its electrodes is reported. The triggering of the spark gap has been achieved by the use of an optical sensor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144544
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  • 18
    Electronic Resource
    Electronic Resource
    On the recovery of a spark gap in a fast discharge circuit (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 4242-4244 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have shown theoretically that the maximum repetition rate attainable with a switch for both resistive and resonant charging is independent of the value of energy transferred through the switch in case of a very fast discharge. Experimental confirmation of this has been achieved with a resistively charged 20 kV pulse generator (C was varied from ≅5 to 35 nF) switched by a spark gap into a load whose resistance varied from few ohms to a kΩ. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149243
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  • 19
    Electronic Resource
    Electronic Resource
    Stress determination of micromembranes using laser vibrometry (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 1965-1969 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A laser vibrometry based dynamic technique for biaxial residual stress determination in micromembranes is reported. Layered, low pressure chemical vapor deposition grown, rectangular shaped micromembranes are ultrasonically excited. The resulting micromembrane displacement, as a function of frequency and position, is recorded to yield resonance frequencies and associated vibrational mode numbers. The stress is determined from this information. Vibrations forced from ultrasonic pressure (∼25 Pa) resulted in peak displacements of tens of nanometers at resonance. For the sample set studied, the (3,1) mode resonance peak displayed the least damping in atmospheric testing and was used to establish stress levels ∼108 N/m2. A trend for this stress showing an overall decrease by ∼40% as a result of thermomechanical cycling was identified. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146952
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  • 20
    Electronic Resource
    Electronic Resource
    Latch proof operation of a switch of a high repetition rate laser with dc resonant charging (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 4813-4816 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We report on the operation of a high voltage high current switch in which command resonant charging capability is built in. Elimination of switch latch up problems do not require any extraneous and complex circuitry. The indigenously developed switch delivers power in excess of 3 kW into a dummy load typical of a TE laser at a pulse repetition rate of 200 Hz. The test on a real TEA CO2 laser load was, however, limited up to 50 Hz repetition rate beyond which the accumulation of dissociation products within the active volume led to arcing. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146157
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