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  • 1
    Electronic Resource
    Electronic Resource
    Large Jc enhancement by ion irradiation for thick YBa2Cu3O7−δ films prepared by photoassisted metalorganic chemical vapor deposition (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 1474-1476 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thick superconducting films of YBa2Cu3O7−δ grown by photoassisted metalorganic chemical vapor deposition that have shown a decrease of Jc with increasing thickness (〉1 μm) have been exposed to ion irradiation in an attempt to enhance Jc. A 4.5 μm thick film irradiated with 1 MeV protons at a dose of 3×1014/cm2 has shown an increase of Jc by a factor of nearly 20–1.7×106 A/cm2 corroborating the proposal that a lack of pinning centers in the grown thick films, due to their high crystalline quality, contributed to the observed decrease of Jc with increasing film thickness. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.118566
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  • 2
    Electronic Resource
    Electronic Resource
    An integral method for the analysis of blood flow (1971)
    Springer
    Bulletin of mathematical biology 33 (1971), S. 117-128 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract The existing methods to solve the problems of pulsatile flow in the cardiovascular system are based on either linear axisymmetric equations or non-linear one-dimensional equations. The solutions thus obtained give only a mediocre comparison with measurements. In this paper, a non-linear axisymmetric theory is proposed. The starting point of the present theory is a third degree polynomial representation of the velocity profile. Integral methods are then applied to obtain the governing equations. To ascertain the accuracy of the theory proposed above, the calculations for a simple case involving pulsatile flow in a long rigid tube were performed. The results are: (a) the average velocities compare very well with exact solutions and (b) the velocity profiles for a given frequency agree very well with exact solutions for flow in small tubes, but tend to differ as tube size is increased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02476669
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  • 3
    Electronic Resource
    Electronic Resource
    Shock and shear initiation of explosive (1991)
    Springer
    Shock waves 1 (1991), S. 285-292 
    Details
    ISSN: 1432-2153
    Keywords: Explosive ; Initiation ; Shock ; Shear ; Impact ; Detonation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics , Technology
    Notes: Abstract Three reaction-rate models, Forest Fire, Arrhenius and a combined Forest Fire and Arrhenius, are incorporated in the hydrocode DEFEL. Simulations with this code for PBX-9404 explosive for bare and covered explosives by fragment impact are made. Results confirm the well-known shock-initiation theory for bare explosives. For explosives with a thick cover plate, code results show macroscopic shear initiation, as proposed by Howe (1985) and Frey (1981).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01418884
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  • 4
    Electronic Resource
    Electronic Resource
    Experimental study of multiple interior impacts (1977)
    Springer
    Experimental mechanics 17 (1977), S. 201-206 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In this paper, experiments involving interior impacts on soft, lead targets are described. The term “interior impact” refers to the impact of a projectile at the bottom of a predrilled hole in the target. It is known that impact of low-velocity projectiles into such soft targets results in plastic flow and cavities similar to those obtained in high-velocity impact of hard targets. Therefore, comparatively simple rifle-propelled projectile impacts on soft targets may yield useful information for high-speed hard-target impacts. Double impacts with a short-time interval, on the order of microseconds, between projectile arrivals were conducted. The leading projectile creates a plastic flow in the target which partially seals the entrance hole. The trailing projectile must first force open the passage hole before achieving additional penetration. The total penetration was measured for different time intervals between the projectiles. A method was developed to obtain double impacts at the same point. The method utilizes a duplex round, which is made up of two separate projectiles fired from the same cartridge. With this round, a series of impact experiments was conducted. It was learned that occlusion, or the close up of the hole, is negligible for nearly simultaneous projectiles (less than 10 μs between impacts), and greatest with about 80 to 100 μs between impacts. The projectile velocity was measured by the use of properly placed photodiodes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02324489
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  • 5
    Electronic Resource
    Electronic Resource
    Study of cylindrical stress waves generated by exploding wires (1972)
    Springer
    Experimental mechanics 12 (1972), S. 104-106 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract An experimental technique utilizing high-pressure gas from an exploding wire is used to load long, hollow, thick-walled cylinders from the inside. Resulting plane-strain cylindrical stress waves are one-dimensional in nature. Asimultaneity of impact is studied with methods of high-speed photography and dynamic photoelasticity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02408447
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  • 6
    Electronic Resource
    Electronic Resource
    Longitudinal impact of cylindrical shells (1972)
    Springer
    Experimental mechanics 12 (1972), S. 25-31 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The transient response due to longitudinal impact of three aluminum cylindrical shells of different thickness-to-radius ratios is studied both analytically and experimentally. The analyses were obtained from method of characteristics' solutions of two sets of equations: one which includes the transverse shear, radial inertia and rotary inertial effects; and the other set is from a modified membrane theory. Experimentally, longitudinal and circumferential strains are monitored along the length of each of the shells; the velocity of the impacter ring is also measured. The experimental results of this study indicate that the wavefront, after traveling three diameters from the impacted end, propagates at essentially the plate velocity, in agreement with the theory. In addition, the longitudinal and circumferential strains calculated from the two theories are in good agreement with the experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02320786
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  • 7
    Electronic Resource
    Electronic Resource
    General Kinematical Solution to the Motion of an Explosively Driven Liner (1986)
    Weinheim : Wiley-Blackwell
    Propellants, Explosives, Pyrotechnics 11 (1986), S. 53-64 
    Details
    ISSN: 0721-3115
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: It is shown that the motion of an explosively driven smooth thin liner, obeys, whenever the material forces are negligible, the following equation: \documentclass{article}\pagestyle{empty}\begin{document}$$ \partial {\rm V}_l /\partial {\rm t = }\partial {\rm (}\frac{{{\rm V}^{\rm 2} }}{2}{\rm) / }\partial l, $$\end{document} where V is the liner velocity, ∂Vl/∂t is the time derivative of the velocity component along the liner direction and l is the Lagrangian coordinate measuring the length of the liner contour (formation line). The transformation from the rest to moving coordinate system is calculated, as well as a very accurate approximation to the liner elongation. Under the assumption of an exponential acceleration a closed form for the liner elongation is obtained. The influence of the liner curvature on the projection angle δ is also found. The comparison of the obtained solution with two dimensional Lagrangian code calculations shows a very good agreement. Finally, some predictions of the model are discussed for demonstrating its applicability to various problems.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prep.19860110205
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  • 8
    Electronic Resource
    Electronic Resource
    Recent Developments in Shaped Charge Technology (1986)
    Weinheim : Wiley-Blackwell
    Propellants, Explosives, Pyrotechnics 11 (1986), S. 99-114 
    Details
    ISSN: 0721-3115
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Shaped-charge principles, including analytical work, computer-code simulations, and experimental results, are reviewed. It is assumed that the reader has a basic understanding of the functioning of shaped charges, and emphasizes developments in recent years. The survey is divided into four sections: Liner Collapse, Jet Formation, Jet Breakup, and Target Penetration. Only traditional shaped charges are covered; kinetic-energy penetrators and self-forging-fragment warheads are not included. Ninety-nine references are cited.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prep.19860110402
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