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  • 1
    Electronic Resource
    Electronic Resource
    Unreacted Hugoniot of Composition B-3 for stresses of 0–16 kbar (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 3404-3408 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A light gas gun has been used to measure the unreacted Hugoniot of both pressed and cast Composition B-3. Transmitted stress and wave speeds were determined from quartz gauges placed on the rear surface of explosive disks. Both pressed and cast Composition B-3 exhibited elastic–plastic behavior. Good agreement was found between the elastic and plastic shock wave speeds and those determined ultrasonically. The elastic constants for pressed Composition B-3 were evaluated ultrasonically. Apparently, reaction in Composition B-3 has not occurred in the Hugoniot measurements described in this work.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335758
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  • 2
    Electronic Resource
    Electronic Resource
    Structural measurements on evaporated a-Si/SiOx superlattices (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 1274-1277 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structure of evaporated a-Si/SiOx superlattices has been investigated by transmission electron microscopy, Raman scattering, and optical absorption spectroscopy. The layers are smooth and regular, but all three measurements show effects of bond distortions or defects within 1–2 nm of the Si/SiOx interfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339680
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  • 3
    Electronic Resource
    Electronic Resource
    Shocks produced by impulsively driven reconnection (1988)
    Springer
    Solar physics 117 (1988), S. 97-121 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Shock waves produced by impulsively driven reconnection may be important during flares or during the emergence of magnetic flux from the photosphere into the corona. Here we investigate such shock waves by carrying out numerical experiments using two-dimensional magneto-hydrodynamics. The results of the numerical experiments imply that there are three different categories of shocks associated with impulsively driven reconnection: (1) fast-mode, blast waves which rapidly propagate away from the reconnection site; (2) slow-mode, Petschek shocks which are attached to the reconnection site; and (3) fast-mode, termination shocks which terminate the plasma jets flowing out from the reconnection site. Fast-mode blast waves are a common feature of many flare models, but the Petschek shocks and jet termination shocks are specific to reconnection models. These two different types of reconnection shocks might contribute to chromospheric ablation and energetic particle acceleration in flares.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00148576
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  • 4
    Electronic Resource
    Electronic Resource
    Steady magnetic reconnection in three dimensions (1989)
    Springer
    Solar physics 119 (1989), S. 211-214 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The concepts of magnetic reconnection that have been developed in two dimensions need to be generalised to three-dimensional configurations. Reconnection may be defined to occur when there is an electric field (E∥) parallel to field lines (known as potential singular lines) which are potential reconnection locations and near which the field has an X-type topology in a plane normal to that field line. In general there is a continuum of neighbouring potential singular lines, and which one supports reconnection depends on the imposed flow or electric field. For steady reconnection the nearby flow and electric field are severely constrained in the ideal region by the condition that E∥ = 0 there. Potential singular lines may occur in twisted prominence fields or in the complex magnetic configuration above sources of mixed polarity of an active region or a supergranulation cell. When reconnection occurs there is dynamic MHD behaviour with current concentration and strong plasma jetting along the singular line and the singular surfaces which map onto them.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00146222
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  • 5
    Electronic Resource
    Electronic Resource
    The formation of flare loops by magnetic reconnection and chromospheric ablation (1989)
    Springer
    Solar physics 120 (1989), S. 285-307 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Slow-mode shocks produced by reconnection in the corona can provide the thermal energy necessary to sustain flare loops for many hours. These slow shocks have a complex structure because strong thermal conduction along field lines dissociates the shocks into conduction fronts and isothermal subshocks. Heat conducted along field lines mapping from the subshocks to the chromosphere ablates chromospheric plasma and thereby creates the hot flare loops and associated flare ribbons. Here we combine a non-coplanar compressible reconnection theory with simple scaling arguments for ablation and radiative cooling, and predict average properties of hot and cool flare loops as a function of the coronal vector magnetic field. For a coronal field strength of 100 G the temperature of the hot flare loops decreases from 1.2 × 107 K to 4.0 × 106 K as the component of the coronal magnetic field perpendicular to the plane of the loops increases from 0% to 86% of the total field. When the perpendicular component exceeds 86% of the total field or when the altitude of the reconnection site exceeds 106km, flare loops no longer occur. Shock enhanced radiative cooling triggers the formation of cool Hα flare loops with predicted densities of ≈ 1013 cm−3, and a small gap of ≈ 103 km is predicted to exist between the footpoints of the cool flare loops and the inner edges of the flare ribbons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00159881
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  • 6
    Electronic Resource
    Electronic Resource
    Book reviews (1986)
    Springer
    The annals of regional science 20 (1986), S. 76-145 
    Details
    ISSN: 1432-0592
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geography , Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01287243
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  • 7
    Electronic Resource
    Electronic Resource
    Book reviews (1987)
    Springer
    The annals of regional science 21 (1987), S. 126-187 
    Details
    ISSN: 1432-0592
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geography , Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01287287
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  • 8
    Electronic Resource
    Electronic Resource
    Book review (1987)
    Springer
    Pure and applied geophysics 125 (1987), S. 183-189 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00878621
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  • 9
    Electronic Resource
    Electronic Resource
    Series solution for transient thermal blooming of an axi-symmetric laser beam (1985)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 36 (1985), S. 275-285 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Wir untersuchen die nichtlineare Verzerrung eines Laserstrahls, der ein komprimierbares Gas durchläuft. Die abhängigen Variablen drücken wir als Taylorsummen aus, deren Koeffizienten wir mittels eines Computers bestimmen. Es zeigt sich, daß der Strahl im Laufe der Zeit erheblich verzerrt wird, wobei die Schwerkraft im Falle eines senkrechten Strahls keine wesentliche Rolle spielt.
    Notes: Abstract Self-defocussing of an intense laser beam propagating through an initially quiescent compressible gas is investigated. The dependent variables are sought as Taylor series expansions involving the two space coordinates and the time, and the resulting recurrence relations are solved by digital computer. The beam is found to distort substantially as it propagates, but is not affected significantly by gravity when aimed vertically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00945461
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  • 10
    Electronic Resource
    Electronic Resource
    Rotation curves for spiral galaxies in clusters and in the field (1989)
    Springer
    Astrophysics and space science 156 (1989), S. 175-181 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Rotation curves of spiral galaxies in clusters are compared with their counterparts in the field using three criteria: (1) inner and outer velocity gradients, (2)M/L gradients, and (3) Burstein's mass type methodology. Both Hα emission-line rotation curves and more extendedHi rotation curves are used. A good correlation is found between the outer gradient of the rotation curve and the galaxy's distance from the centre of the cluster, in the sense that the inner galaxies tend to have falling rotation curves while the outer galaxies, and field galaxies, tend to have flat or rising rotation curves. A correlation is also found between theM/L gradient across a galaxy and the galaxy's position in the cluster, with the outer galaxies having steeperM/L gradients. Mass types for field spirals are shown to be a function of both Hubble-type and luminosity, contrary to earlier results. The statistical difference between the distribution of mass types in clusters and in the field reported by Bursteinet al. is confirmed. These correlations indicate that the inner cluster environment can strip away some fraction of the mass in the outer halo of a spiral galaxy, or alternatively, may not allow the halo to form.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00646362
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