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  • 1
    Electronic Resource
    Electronic Resource
    ANTIOXIDANT ACTIVITY OF SOYBEAN FLOUR AND DERIVATIVES–A REVIEW (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 42 (1977), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Soybean flour and various derivatives, with different natural, interacting primary antioxidants and synergists can stabilize lipids in formulated foods. Soybean flour has been shown to be a basic source of such antioxidant compounds as isoflavone glycosides and their derivatives, phospholipids, tocopherols, amino acids and peptides. There may be some antioxidant impact from aromatic amines and sulfhydryl compounds. Successful efforts have been made to concentrate the antioxidant activity in soy flour by aqueous extraction and by extraction with various organic solvents. Residual antioxidant activity has been reported in food systems containing soy protein concentrates, isolates and textured vegetable protein. Soy protein hydrolyzates have antioxidant activity which is associated with free amino acids and lower molecular weight peptides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1977.tb08417.x
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  • 2
    Electronic Resource
    Electronic Resource
    Ultralong minority-carrier lifetime epitaxial GaAs by photon recycling (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 1088-1090 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The minority-carrier lifetime has been measured by time-resolved photoluminescence in epitaxial films of GaAs grown by metalorganic chemical vapor deposition. The measured lifetimes in thicker devices are 4 to 6 times the theoretical or radiative lifetime. These long lifetimes are the result of photon recycling or self-generation of the self-absorbed radiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101713
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of multiple reflection propagation on photon recycling in GaAs/AlGaAs double heterostructures (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 8158-8162 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An analysis is presented to accurately calculate the effects of photon recycling on the minority-carrier lifetime in the active region of GaAs/Al0.3Ga0.7As double heterostructures. It is shown that the minority-carrier lifetime multiplication factor and resulting minority-carrier lifetime are dominated by multiple reflection propagation for samples with thicknesses of approximately less than 1.0 μm. The calculated results are in good agreement with previously published experimental data on the variation of the minority-carrier lifetime multiplication factor with active region thickness, indicating the usefulness of the analysis to accurately model the effects of photon recycling in transient photoluminescence measurement of thin devices. This may lead to accurate determination of the minority-carrier lifetime, diffusion coefficient, and surface recombination velocities at the levels of interest for device applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356514
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  • 4
    Electronic Resource
    Electronic Resource
    Fast turn-off of two-terminal double-heterojunction optical thyristors (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 1326-1328 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A double-heterojunction optical thyristor is presented, that can be turned off in a few nanoseconds simply by using the anode to a negative voltage exceeding a certain threshold. Previously, nanosecond-range turn-off could only be achieved by carrier extraction via contacts to either or both of the center two thyristor layers. Our turn-off method uses a PnpN layer structure for which punch-through of the n-layer under reverse bias of the P-n diode can be reached before this diode breaks down. We thus achieve an improvement in turn-off time by about 3 orders of magnitude over traditional two-terminal thyristors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107581
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  • 5
    Electronic Resource
    Electronic Resource
    An equation of motion for an incompressible Newtonian fluid in a packed bed (1995)
    Springer
    Transport in porous media 18 (1995), S. 185-198 
    Details
    ISSN: 1573-1634
    Keywords: Finite element ; permeability ; Navier-Stokes ; packed bed ; spherical particles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract The application of a volume average Navier-Stokes equation for the prediction of pressure drop in packed beds consisting of uniform spherical particles is presented. The development of the bed permeability from an assumed porous microstructure model is given. The final model is quasi-empirical in nature, and is able to correlate a wide variety of literature data over a large Reynolds number range. In beds with wall effects present the model correlates experimental data with an error of less than 10%. Numerical solutions of the volume averaged equation are obtained using a penalty finite element method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01064677
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  • 6
    Electronic Resource
    Electronic Resource
    An adaptive domain decomposition method for simulation of transport in porous media (1988)
    Springer
    Transport in porous media 3 (1988), S. 549-562 
    Details
    ISSN: 1573-1634
    Keywords: Adaptive mesh ; finite element method ; dispersion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract A Galerkin finite element method is used along with a self-adaptive strategy of domain discretisation to model dispersion in an axisymmetric cylindrical porous medium. A solution strategy is proposed based on the use of a Gear scheme for the time stepping and partial vectorisation of the code. The domain is highly discretised in the area of the sharp transient front, while the remainder is coarsely discretised. The area covered by the fine mesh is determined by the value of the local concentration gradients. Numerical results are presented for the one and two dimensional cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00959102
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  • 7
    Electronic Resource
    Electronic Resource
    A study of two-dimensional dispersion in unconsolidated porous media (1990)
    Springer
    Transport in porous media 5 (1990), S. 269-286 
    Details
    ISSN: 1573-1634
    Keywords: Dispersion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract An experimental and numerical investigation into the magnitude of longitudinal and transverse dispersion in a two-dimensional flow field over a particle Peclet number range of 50–8500 is reported. Numerical modelling using a Galerkin finite element method is used to test various models, notably those of Fried and combarnous and Koch and Brady. Dispersion at low Peclet numbers (〈 200) is found to be described adequately by either model, which at large Peclet, the degree of dispersion is significantly underestimated. An improved dispersion model for Peclet numbers greater than 200 is proposed. The transverse dispersion term and the choice of inlet boundary condition are found to have a negligible effect on the shape of the breakthrough curve.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00140016
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  • 8
    Electronic Resource
    Electronic Resource
    Forced convection heat transfer at the boundary layer of a packed bed (1990)
    Springer
    Transport in porous media 5 (1990), S. 231-245 
    Details
    ISSN: 1573-1634
    Keywords: Heat transfer ; variable porosity ; finite element method ; packed beds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract Numerical investigations of the nature of the fluid flow pattern and heat transfer at the boundary layer of a packed bed are reported. A volume averaged Navier-Stokes equation is used to predict the fluid flow and a volume averaged heat balance equation the heat transfer. A variable porosity in the packing is assumed in the region near the wall. Simulations are performed using a modified penalty Galerkin finite element method. The case of fully developed hydrodynamic flow and developing thermal flow is studied. The Nusselt number is found to depend on the Reynolds number, Graetz number and ratio of thermal conductivity of the solid and fluid phases. Comparison is made to some experimental literature values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00140014
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  • 9
    Electronic Resource
    Electronic Resource
    Dispersion in consolidated sandstone with radial flow (1995)
    Springer
    Transport in porous media 19 (1995), S. 37-66 
    Details
    ISSN: 1573-1634
    Keywords: dispersion ; sandstone ; radial flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract This paper presents some experimental and theoretical results for dispersion processes occurring in consolidated Berea sandstone with radial flow geometry. A comprehensive review of the derivation and application of several analytical solutions is also presented. The Galerkin finite element method is applied to solve the advection-dispersion equation for unidimensional radial flow. Individual and combined effects of mechanical dispersion and molecular diffusion are examined using velocity-dependent dispersion models. Comparison of simulated results with experimental data is made. The effect of flow rates is examined. The results suggest that a linear dispersion model,D=αu, whereD is the dispersion coefficient,u the velocity andα a constant, is not a good approximation despite its wide acceptance in the literature. The most suitable mathematical formulation is given by an empirical form of $$D = D_0 + \mathop \alpha \limits^` u^m$$ , whereD ois the molecular diffusion coefficient. For the range of Péclet number (Pe=vd/D m,wherev is the characteristic velocity,d the characteristic length andD mthe molecular diffusion coefficient in porous media) examined (Pe=0.5 to 285), a power constant ofm=1.2 is obtained which agrees with the value reported by some other workers for the same regime. From the results of experiments and numerical modelling, the effect of mobility ratios (defined as the ration of viscosities of displaced and displacing fluids) on dispersion is found to be negligible, provided that the ratio is favourable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00716048
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  • 10
    Electronic Resource
    Electronic Resource
    Modelling the flow of power law fluids in a packed bed using a volume-averaged equation of motion (1996)
    Springer
    Transport in porous media 23 (1996), S. 175-196 
    Details
    ISSN: 1573-1634
    Keywords: non-Newtonian fluid ; packed bed ; pressure drop
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract The development of a theoretical model for the prediction of velocity and pressure drop for the flow of a viscous power law fluid through a bed packed with uniform spherical particles is presented. The model is developed by volume averaging the equation of motion. A porous microstructure model based on a cell model is used. Numerical solution of the resulting equation is effected using a penalty Galerkin finite element method. Experimental pressure drop values for dilute solutions of carboxymethylcellulose flowing in narrow tubes packed with uniformly sized spherical particles are compared to theoretical predictions over a range of operating conditions. Overall agreement between experimental and theoretical values is within 15%. The extra pressure drop due to the presence of the wall is incorporated directly into the model through the application of the no-slip boundary condition at the container wall. The extra pressure drop reaches a maximum of about 10% of the bed pressure drop without wall effect. The wall effect increases as the ratio of tube diameter to particle diameter decreases, as the Reynolds number decreases and as the power law index increases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00178125
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