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  • 1
    Electronic Resource
    Electronic Resource
    Statistical crystallography of surface micelle spacing (1992)
    s.l. : American Chemical Society
    Langmuir 8 (1992), S. 1036-1038 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00040a002
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  • 2
    Electronic Resource
    Electronic Resource
    The baroeffect and an appropriate momentum boundary condition (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 858-865 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: As disparate molecular weight gases isothermally diffuse between two ends of a capillary tube, they can support a pressure gradient. The magnitude of this pressure gradient depends critically on viscous wall stress and becomes a measure of the boundary condition. This baroeffect has been used to test the state of a gas surface layer. Specifically, it allows one to quantify whether a binary gas has a finite wall velocity (diffusive slip). Here, a one-dimensional analytical model is proposed that allows for specular gas reflection from the wall. It explains anomalous (4/3) correction factors required previously to match experiment to baroeffect models. It predicts a new physical phenomenon, a surface-driven baroeffect for equal molecular weight gases. Diffusive slip contributions exceed the order of convective diffusion for Peclet number Pe〈1 and approximately equal convective diffusion for 1〈Pe〈4. For binary gases, this model further extends the baroeffect experiment as a means to find momentum accommodation coefficients (MAC), slip lengths, and external friction coefficients. A corrected binary diffusion coefficient is defined. Analogous arguments can be made to explain corrections to thermal and viscous slip.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857634
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  • 3
    Electronic Resource
    Electronic Resource
    Weightless bubble lattices: A case of froth wicking (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 6 (1994), S. 2493-2500 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the absence of gravity drainage, froth wicking draws excess fluid onto a bubble lattice. Capillary forces only cause fluid transport; a moving front moves stably and without fluid fingering along a constant velocity bubble–fluid contact line. This percolation of fluid crawling up the lattice shows (1) fluid coverage on lattice borders varies linearly with available surface area (proportional to lattice perimeter); (2) fluid accelerates through regions or nests of high bubble density (number of bubbles cm−2). The development of nearly two-dimensional bubble lattices in variable gravity (step function between 0.01 and 1.8 times earthly gravity) are examined experimentally and a zeroth-order model for froth wetting is presented, which captures many of the principal observations. Possible applications for bubble lattices include adhesion casting of metals and separation of biological cells, bacteria, and particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868197
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  • 4
    Electronic Resource
    Electronic Resource
    A rotating spectrometer for separation/concentration of bioconvecting microorganisms (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 229-232 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The rotating spectrometer is discussed as a method to separate and concentrate microorganisms in free solution. Following focusing in a rotated frame, the separation is accomplished using different radial dependencies of concentrated algal and protozoan species. The focusing itself appears as concentric rings and arises from the coupling between swimming direction and Coriolis forces. A dense cut is taken at varying radii and extraction is replenished at an inlet. Unlike standard separation and concentrating techniques, the rotating method requires active organism participation and, in principle, can split different morphologies and swimming behaviors for the large class of organisms known to bioconvect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142312
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  • 5
    Electronic Resource
    Electronic Resource
    Crystallography of rare galactic honeycomb structure near supernova 1987A (1994)
    Springer
    Astrophysics and space science 220 (1994), S. 65-74 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Near supernova 1987a, the rare honeycomb structure of 20–30 galactic bubbles measures 30 × 90 light years. Its remarkable regularity in bubble size suggests a single-event orgin which may correlate with the nearby supernova. To test the honeycomb's regularity in shape and size, the formalism of statistical crystallography is developed here for bubble sidedness. The standard size-shape relations (Lewis's law, Desch's law, and Aboav-Weaire's law) govern area, perimeter and nearest neighbor shapes. Taken together, they predict a highly non-equilibrium structure for the galactic honeycomb which evolves as a bimodal shape distribution without dominant bubble perimeter energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00628077
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  • 6
    Electronic Resource
    Electronic Resource
    Ocean-atmosphere CO2 exchange: An accessible lab simulation for considering biological effects (1994)
    Springer
    Climatic change 27 (1994), S. 299-320 
    Details
    ISSN: 1573-1480
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Phytoplankton is considered a key component mediating the ocean-atmospheric exchange of carbon dioxide and oxygen. Lab simulations which model biological responses to atmospheric change are difficult to translate into natural settings owing in part to the vertical migration of phytoplankton. In the sea this vertical migration acts to regulate actual carbon dioxide consumption. To capture some critical properties of this vertical material transfer, we monitored the effects of atmospheric CO2 on dense suspensions of bioconvecting microorganisms. Bioconvection refers to the spontaneous patterns of circulation which arise among such upwardly swimming cells as alga, protozoa, zoospore and large bacteria. Gravity, phototaxis and chemotaxis have all been implicated as affecting pattern-forming ability. The ability of a biologically active suspension to detect atmospheric changes offers a unique method to quantify organism adjustment and vertical migration. With increasing CO2, bioconvection patterns in alga (P. parva) and protozoa (T. pyriformis) lose their robustness, and surface cell populations retreat from the highest CO2 regions. Cell movement (both percent motile and mean velocity) generally diminishes. A general program of image analysis yields statistically significant variations in macroscopic migration patterns; both fractal dimension and various crystallographic parameters correlate strongly with carbon dioxide content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01094292
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  • 7
    Electronic Resource
    Electronic Resource
    Noble Metal Immersion Spectroscopy of Silica Alcogels and Aerogels (2000)
    Springer
    Journal of porous materials 7 (2000), S. 499-508 
    Details
    ISSN: 1573-4854
    Keywords: effective medium theory ; surface plasmon resonance ; aerogels ; metal nanoparticles ; silica
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract We have fabricated aerogels containing gold and silver nanoparticles for gas catalysis applications. The technique of immersion spectroscopy is extended to porous or heterogeneous media allowing the surface area of metal available for catalytic gas reaction to be determined. Specifically, we apply the predominant effective medium theories to the heterogeneous interlayer surrounding each particle to determine the average fractional composition of each component in this inhomogeneous layer. The technique is satisfactory for statistically random metal particle distributions but needs further modification for aggregated or surfactant modified systems. Additionally, the kinetics suggest that collective particle interactions in coagulated clusters are perturbed during silica gelation resulting in a change in the aggregate geometry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009678811808
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  • 8
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    Ternary baroeffect with a nondiffusing component (1990)
    American Physical Society
    Details
    Publication Date: 1990-09-24
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society
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  • 9
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    Bioconvective patterns, synchrony, and survival (1990)
    American Physical Society
    Details
    Publication Date: 1990-10-08
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society
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  • 10
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    Scaling laws for buckling instability in monolayer networks (1992)
    American Physical Society
    Details
    Publication Date: 1992-08-31
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society
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