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  • 1
    Electronic Resource
    Electronic Resource
    The effects of fluctuating body forces on annular liquid jets (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 548-563 
    Details
    ISSN: 1432-0681
    Keywords: Key words nonlinear dynamics ; annular jet ; gravitational fluctuations ; adaptive finite difference method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary  The nonlinear dynamics of axisymmetric, inviscid, incompressible, thin, annular liquid jets subjected to fluctuating body forces is studied numerically by means of an adaptive finite difference method which maps the time-dependent, curvilinear geometry of the jet into a unit square. The fluctuating body forces may arise from fluctuations in the gravitational acceleration in inertial frames or from the acceleration of a non-inertial frame of reference which translates parallelly to an inertial one. It is shown that both the pressure coefficient and the axial location at which the annular jet becomes a solid one are periodic functions of time with a period equal to that of the imposed body force fluctuations, and that their magnitude increases as the amplitude of the body force fluctuations is increased. It has also been shown that, for both intermittent, sinusoidal or rectangular excitations, increases in the frequency of the excitation result in the creation of superharmonics, broad, albeit peaked, spectra, and closed phase planes with many loops.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00789096
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  • 2
    Electronic Resource
    Electronic Resource
    (Ammine)(aqua)[N-(2,6-dimethylphenyl)-N-(carboxymethyl)glycinato-N,O,O'']copper(II) (1995)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 51 (1995), S. 1510-1512 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270194015064
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  • 3
    Electronic Resource
    Electronic Resource
    Diaqua[N-(2-ethylphenyl)-N-(carboxymethyl)glycinato-N,O,O'']copper(II) (1995)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 51 (1995), S. 1512-1514 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270195002009
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  • 4
    Electronic Resource
    Electronic Resource
    Comet cross-section tokamaks (1995)
    Springer
    Journal of fusion energy 14 (1995), S. 361-371 
    Details
    ISSN: 1572-9591
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract We explore the stability and confinement properties of tokamaks with comet-shaped plasmas which feature oblate cross-sections and negative triangularity. Such cross-section shaping is expected to reduce the trapping of particles in regions of bad curvature and lead to improved confinement. Additionally, it can improve stability to Mercier modes. This approach can therefore lead to reactors with improved confinement and lower plasma current.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02214514
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  • 5
    Electronic Resource
    Electronic Resource
    The effects of fluctuating body forces on annular liquid jets (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 548-563 
    Details
    ISSN: 1432-0681
    Keywords: nonlinear dynamics ; annular jet ; gravitational fluctuations ; adaptive finite difference method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary The nonlinear dynamics of axisymmetric, inviscid, incompressible, thin, annular liquid jets subjected to fluctuating body forces is studied numerically by means of an adaptive finite difference method which maps the time-dependent, curvilinear geometry of the jet into a unit square. The fluctuating body forces may arise from fluctuations in the gravitational acceleration in inertial frames or from the acceleration of a non-inertial frame of reference which translates parallelly to an inertial one. It is shown that both the pressure coefficient and the axial location at which the annular jet becomes a solid one are periodic functions of time with a period equal to that of the imposed body force fluctuations, and that their magnitude increases as the amplitude of the body force fluctuations is increased. It has also been shown that, for both intermittent, sinusoidal or rectangular excitations, increases in the frequency of the excitation result in the creation of superharmonics, broad, albeit peaked, spectra, and closed phase planes with many loops.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00789096
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  • 6
    Electronic Resource
    Electronic Resource
    Isothermal mass transfer in annular liquid jets with Sievert’ solubility law (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 260-269 
    Details
    ISSN: 1432-0681
    Keywords: Key words Liquid jet ; waste ; solubility ; interface ; fluid dynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary  A study of isothermal gas absorption by underpressurized, axisymmetric, thin, inviscid, incompressible, annular liquid jets which form enclosed volumes, where hazardous wastes may be burned, is presented. The study considers the nonlinear dynamical coupling between the fluid dynamics of, and the gases enclosed by, the annular liquid jet. It assumes equilibrium conditions at the interfaces, and employs Sievert’ solubility law to determine the gas concentration at the gas-liquid interfaces. Both steady-state and transient conditions are considered. Under steady-state conditions, the fluid dynamics and mass transfer phenomena are uncoupled, and the rate of generation of combustion gases is equal to the mass absorption rate by the liquid. The transient behaviour of the annular jet is determined from initial conditions corresponding to steady-state operation, once there is no gas generation by the combustion of hazardous wastes. It is shown that, for most of the conditions considered in this paper, there is no leakage of gaseous combustion products through the jet’ outer interface, and that the amount of gases dissolved in the liquid at the nozzle exit and the solubility ratio play a paramount role in determining the mass fluxes of hazardous combustion products at the annular jet’ interfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00805465
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  • 7
    Electronic Resource
    Electronic Resource
    Isothermal mass transfer in annular liquid jets with Sievert's solubility law (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 260-269 
    Details
    ISSN: 1432-0681
    Keywords: Liquid jet ; waste ; solubility ; interface ; fluid dynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary A study of isothermal gas absorption by underpressurized, axisymmetric, thin, inviscid, incompressible, annular liquid jets which form enclosed volumes, where hazardous wastes may be burned, is presented. The study considers the nonlinear dynamical coupling between the fluid dynamics of, and the gases enclosed by, the annular liquid jet. It assumes equilibrium conditions at the interfaces, and employs Sievert's solubility law to determine the gas concentration at the gas-liquid interfaces. Both steady-state and transient conditions are considered. Under steady-state conditions, the fluid dynamics and mass transfer phenomena are uncoupled, and the rate of generation of combustion gases is equal to the mass absorption rate by the liquid. The transient behaviour of the annular jet is determined from initial conditions corresponding to steady-state operation, once there is no gas generation by the combustion of hazardous wastes. It is shown that, for most of the conditions considered in this paper, there is no leakage of gaseous combustion products through the jet's outer interface, and that the amount of gases dissolved in the liquid at the nozzle exit and the solubility ratio play a paramount role in determining the mass fluxes of hazardous combustion products at the annular jet's interfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00805465
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  • 8
    Electronic Resource
    Electronic Resource
    The molecular relaxation mechanisms in cork as studied by thermally stimulated discharge currents (1995)
    Springer
    Journal of materials science 30 (1995), S. 2035-2041 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The dielectric relaxation mechanisms present in cork have been investigated in the temperature range -100 to 100 °C using the technique of thermally stimulated discharge currents. A relaxation mechanism was detected which showed a compensation behaviour as observed for the α-relaxation (or glass transition relaxation) of synthetic polymers and which lead us to attribute to cork a glass transition-like temperature of 18 °C. One lower temperature mechanism was also observed, with low activation enthalpy and entropy, which is presumably originated by local motions (internal rotations) of polar molecular groups. An upper T g relaxation of higher intensity was also detected which was attributed to large-scale non-cooperative motions of polymeric segments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00353030
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  • 9
    Electronic Resource
    Electronic Resource
    Hopf bifurcation in annular liquid jets with mass transfer (1995)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 20 (1995), S. 1293-1314 
    Details
    ISSN: 0271-2091
    Keywords: chemical reactors ; annular liquid jets ; grid generation ; mass absorption ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A numerical study of Hopf bifuractions in annular liquid jets with mass transfer is presented. The study is based on the asymptotic equations which govern the dynamics of inviscid, incompressible, thin, annular liquid jets and on equilibrium conditions for mass transfer at the jet's inner and outer interfaces. It is shown that the amplitude of the time-periodic motion that results from the Hopf bifurcation increases whereas its frequency decreases as the solubility ratio is increased.
    Additional Material: 19 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650201202
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  • 10
    Electronic Resource
    Electronic Resource
    One-dimensional, time-dependent, homogeneous, two-phase flow in volcanic conduits (1995)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 21 (1995), S. 253-278 
    Details
    ISSN: 0271-2091
    Keywords: volcanic conduits ; homogeneous flow ; exsolution ; total-variation-diminishing techniques ; method of characteristics ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A one-dimensional, time-dependent, isothermal, homogeneous, two-phase flow model was developed to study magma ascent in volcanic conduits. The physical modeling equations were numerically solved by means of a TVD (total variation diminishing) predictor-corrector procedure and by means of a predictor-corrector technique based on the method of characteristics. The results from the transient model were verified with an analytical solution for wave propagation in conduits without friction and gravitational effects. The numerical solutions were also compared with those of a steady-state, homogeneous, two-phase model for basaltic and rhyolitic magma ascents in the fissures and circular conduits of Vesuvius and Mt St. Helens. An application of the model to magma decompression in conduits indicates very short times for gas exsolution, fragmentation, and shock wave propagation, implying that the modelling of gas exsolution should involve non-equilibrium kinetics effects. Future coupling of the transient magma ascent model with magma chamber and pyroclastic dispersion models should allow for more realistic simulations of the time-dependent behavior of real volcanic eruptions.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650210306
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