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  • 1
    Electronic Resource
    Electronic Resource
    Laser surface treatment dominated by buoyancy flows (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 1972-1975 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An experimental setup is investigated wherein surface tension forces are suppressed during laser treatment and the melt pool convection is controlled by buoyancy forces. The structure of surfaces processed by this method differs from those of conventionally treated surfaces. A dimensionless measure of buoyancy-flow strength, namely the Grashof number, is employed to quantify the flow intensity that is linked to the breakdown of the covering particle coating. Using a two-dimensional numerical approach the flow and temperature fields are computed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351161
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  • 2
    Electronic Resource
    Electronic Resource
    Negative ion enhancement in caesium-seeded hydrogen discharges—a volume or surface effect? (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 2737-2739 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of plasma parameters, including H− ion densities, made in conjunction with wall temperature, visible and vacuum ultraviolet emission spectroscopy verify that there is little caesium in the plasma volume of the H− ion source. Surface work function measurements indicate that there is significant caesium coverage of the inner walls of the ion source. It is found that, as the work function of a test surface decreases due to caesium seeding, the H− ion fraction in the discharge volume increases. These observations combine to indicate that, in the present source, the H− ion enhancement mechanism is a surface dominated effect. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125133
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  • 3
    Electronic Resource
    Electronic Resource
    CEREBRAL METABOLIC AND VASCULAR EFFECTS OF BARBITURATE THERAPY FOLLOWING COMPLETE GLOBAL ISCHEMIA (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 31 (1978), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Complete global cerebral ischemia was induced in dogs by temporary ligation of the ascending aorta for 10min. Prior to the ischemic period, half of the animals were given pentobarbital 30-38 mg/kg, a maneuver previously reported to prevent or attenuate cerebral damage in this same model. Cerebral blood flow (CBF) and cerebral metabolic rate (CMRO2) were followed from prior to the ischemic period to 6 h post-ischemia. At varying time intervals following ischemia, brain biopsies were obtained and analyzed for cerebral metabolites to determine the cerebral energy state. Only a few differences were observed between pentobarbital-treated and untreated animals. Post-ischemic CMRO2, stabilized at a significantly lower level in treated than in untreated animals. However, CBF was proportionately lower and thus O2 delivery relative to O2 needs in the two groups was comparable. Also in both groups, the CBF and CMRO2 stabilized at levels significantly below pre-ischemia controls. Cerebral energy stores in both groups were depleted after 10min of ischemia but were restored to near normal within 4min post-ischemia. Total restoration of the adenine nucleotide pool and ATP were delayed as was the return of brain lactate to normal. A 10min period of post-ischemic hyperemia was observed in all animals and in the initial 4min post-ischemia CMRO2 was also increased. The latter is probably accounted for by the O2 needs for restoration of cerebral energy and O2 stores. We conclude that cerebral protection as provided by barbiturates following complete global ischemia cannot be accounted for by any measurable effect on CBF, CMRO2, or the cerebral energy stores during the initial 6 h post-ischemia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1978.tb06257.x
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  • 4
    Electronic Resource
    Electronic Resource
    Role of low-energy electrons in Ar emission from low-pressure radio frequency discharge plasma (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 328-330 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optical emission spectra from a low-pressure Ar plasma were studied with high spatial resolution. It has been shown that the intensity ratios of Ar lines excited through metastable levels to those excited directly from the ground state are sensitive to the shape of electron energy distribution function. From these measurements, important information on the spatial variation of plasma parameters can be obtained. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124365
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  • 5
    Electronic Resource
    Electronic Resource
    Structure observed in measured electron energy distribution functions in capacitively coupled radio frequency hydrogen plasmas (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 331-333 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electron energy probability functions measured with a passively compensated Langmuir probe in asymmetric capacitively coupled hydrogen and deuterium plasmas exhibit structure. The otherwise relatively continuous distribution appears to have an abrupt peak in electron density near 5 eV. This structure occurs at a higher energy in deuterium than hydrogen and there is a correlation between floating potential and the voltage at which the structure is observed in the second derivative of the I(V) characteristic. While the cause of the structure has yet to be clarified, spectroscopic observations and computer-based hydrogen models indicate that the high energy tail of the distribution is strongly modulated during the radio frequency cycle. The effect of this modulation on plasma properties and probe measurements has yet to be explored. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124366
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  • 6
    Electronic Resource
    Electronic Resource
    Atomic oxygen surface loss coefficient measurements in a capacitive/inductive radio-frequency plasma (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 81 (2002), S. 19-21 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spatially resolved measurements of the atomic oxygen densities close to a sample surface in a dual mode (capacitive/inductive) rf plasma are used to measure the atomic oxygen surface loss coefficient β on stainless steel and aluminum substrates, silicon and silicon dioxide wafers, and on polypropylene samples. β is found to be particularly sensitive to the gas pressure for both operating modes. It is concluded that this is due to the effect of changing atom and ion flux to the surface. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1490630
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  • 7
    Electronic Resource
    Electronic Resource
    High-Reynolds-number flow in a narrow gap driven by solidification. II. Planar-flow casting application (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 13 (2001), S. 834-840 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Flow driven by solidification is studied in the limit when fluid dynamics and heat transfer decouple. This occurs for processes that are characterized by a long flat solidification front and/or thin molten zones. The gap-averaged governing equations, derived in part I [Phys. Fluids 13, 826 (2001)], are applied to planar-flow melt-spinning where liquid metal, held by surface tension in the gap between the injection nozzle and spinning chill-wheel, forms a long thin puddle. A Karman–Pohlhausen approach that includes mean flow and shear flow components leads to velocity and pressure distributions consistent with observation from experiment. A pressure rise along the flow path due to solidification suction competes with the pressure decrease due to convergent Bernoulli flow. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1352637
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  • 8
    Electronic Resource
    Electronic Resource
    High-Reynolds-number flow in a narrow gap driven by solidification. I. Theory (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 13 (2001), S. 826-833 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Flow driven by solidification is studied in a limit when fluid dynamics and heat transfer decouple. The governing equations are derived by integrating the mass and momentum equations over a narrow gap of any shape within which rapid solidification occurs. These equations are then simplified by exploiting the high-Reynolds-number characteristics of the flow. The modeling leads to fluid dynamics with a suction-type boundary layer established at the solid/liquid interface due to solid pulling and phase change. In part II [Phys. Fluids 13, 834 (2001)], the method is applied to planar-flow melt-spinning where liquid metal, held by surface tension in the gap between the injection nozzle and spinning chill-wheel, forms a long thin puddle. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1352636
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  • 9
    Electronic Resource
    Electronic Resource
    Modelling of chemical reactions catalysed by membrane-bound enzymes. Determination and significance of the kinetic constants
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Protein Structure and Molecular 995 (1989), S. 151-159 
    Details
    ISSN: 0167-4838
    Keywords: Enzyme kinetics ; Kinetic constant ; Mathematical modeling ; Membrane enzyme ; Partition constant ; Phospholipid vesicle
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0167-4838(89)90074-5
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  • 10
    Electronic Resource
    Electronic Resource
    Computational efficiency and approximate inertial manifolds for a Bénard convection system (1993)
    Springer
    Journal of nonlinear science 3 (1993), S. 153-167 
    Details
    ISSN: 1432-1467
    Keywords: inertial manifolds ; Bénard convection ; nonlinear Galerkin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Summary A computational comparison between classical Galerkin and approximate inertial manifold (AIM) methods is performed for the case of two-dimensional natural convection in a saturated porous material. For prediction of Hopf and torus bifurcations far from convection onset, the improvements of the AIM method over the classical one are small or negligible. Two reasons are given for the lack of distinct improvement. First, the small boundary layer length scale is the source of the instabilities, so it cannot be modeled as a “slave” to the larger scales, as the AIM attempts to do. Second, estimates based on the Gevrey class regularity of solutions to the governing equations show that the classical and AIM methods may be virtually equivalent. It is argued that these two reasons are physical and mathematical reflections of one another.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02429862
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