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  • 1
    Electronic Resource
    Electronic Resource
    Transition to global stochasticity in a driven Morse oscillator (1987)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 32 (1987), S. 743-748 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We studied the IR multiphton excitation and dissociation process of a Morse oscillator driven by an external sinusoidal field. Primary resonances and an infinite sequence of secondary resonances have been found that can be analyzed by using Chirikov's nonlinear resonance theory. The transition threshold to global stochasticity is also estimated based on the overlap criterion. Above the threshold dynamical flows are slowed down by the presence of cantori, as clearly demonstrated by the time-dependent dissociation rates calculated for several ensembles of initial points. A scaling law is found in the vicinity of the threshold with a critical exponent in close agreement with that predicted for the standard map.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560320773
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  • 2
    Electronic Resource
    Electronic Resource
    Correlations between gas permeation and free-volume hole properties probed by positron annihilation spectroscopy (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 33 (1995), S. 2365-2371 
    Details
    ISSN: 0887-6266
    Keywords: positron annihilation ; positronium ; free volume ; hole ; gas permeation ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Free-volume hole sizes, fractions, and distributions in a series of polycarbonate-based polymers are measured by using positron annihilation lifetime (PAL) spectroscopy. Correlations between the obtained free-volume hole properties and gas diffusion coefficients are observed. © 1995 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1995.090331708
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  • 3
    Electronic Resource
    Electronic Resource
    Subnanometer hole properties of CO2-exposed polysulfone studied by positron annihilation lifetime spectroscopy (1998)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 36 (1998), S. 3049-3056 
    Details
    ISSN: 0887-6266
    Keywords: positron annihilation ; free volume ; polysulfone ; CO2 gas exposure ; Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Positron annihilation lifetime (PAL) spectroscopy has been employed to study subnanometer hole properties in polysulfone (PSF). In this study, hole properties of size, fraction, and distribution of PSF exposed to CO2 are reported. In the PSF/CO2 system, the hole size and fraction significantly increase and the free-volume distribution broadens as a function of CO2 pressure in the range of 0-1000 psi. Hysteresis in hole properties is observed during CO2 sorption/desorption cycle. The high sensitivity of PAL results due to CO2 exposure in PSF is explained in terms of the microstructural changes in the polymer matrix, i.e., filling penetrant and plasticization, gas hydrostatic pressure effect, and creation of free volumes and holes. © 1998 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 36: 3049-3056, 1998
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    The effect of high pressure on the mechanical behavior of short fiber composites (1984)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 24 (1984), S. 844-850 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Three types of pressure dependent deformation processes have been observed for the short glass fiber reinforced composites of poly(vinyl chloride) (PVC). A unique deformation behavior, observed for the first time, features a sharp drop in stress followed by shear yielding in the matrix. Competitive pressure dependent failure processes in the composites are strongly affected by “debonding” at the fiber-matrix interface. A new general pressure dependent yield criterion for PVC and its composites was elucidated.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760241103
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  • 5
    Electronic Resource
    Electronic Resource
    Acoustic emission during irreversible deformation in short fiber reinforced poly(vinyl chloride) composites (1986)
    Brookfield, Conn. : Wiley-Blackwell
    Polymer Composites 7 (1986), S. 26-35 
    Details
    ISSN: 0272-8397
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Acoustic emission (AE) during irreversible deformation in short glass fiber reinforced poly(vinyl chloride) (PVC) composites was studied using a piezoelectric crystal transducer. Compared to the well-coupled composites, many more AE events were observed during tensile deformation in the poorly-coupled composites, presumably due to failure at the fiber-matrix interface. No fiber fracture was detected in the tensile tests for either well-coupled or poorly-coupled composites. Irreversibility of acoustic emission was observed in repeated tensile loading experiments. Unlike PVC, the short fiber composites fractured during stress relaxation at 1 percent elongation. Studies of acoustic emission behavior during stress relaxation indicated that interfacial debonding is a time-dependent process. Relaxation fracture time was strongly increased by chemical coupling at the interface.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pc.750070107
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