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  • 1
    Electronic Resource
    Electronic Resource
    Consistently averaged hydrodynamic interaction beyond the Oseen approximation for Rouse–Zimm–Bueche dumbbells in steady shear flow (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 1248-1252 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The effect of including corrections to the Oseen hydrodynamic interaction in the rheological properties of polymer solutions is investigated. The case of a dilute suspension of Rouse–Zimm–Bueche dumbbells in steady shear flow is examined within the consistent averaging approximation due to O¨ttinger [J. Chem. Phys. 83, 6535 (1985)]. A reduction of the values of the material functions as compared to the results obtained in the Oseen approximation is observed. The effect is most important at zero shear rate and the highest allowed value of the hydrodynamic interaction parameter. It decreases when either the shear rate is increased or the hydrodynamic interaction parameter is lowered. The ratio of the second to the first normal stress coefficients is always a small positive quantity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454245
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  • 2
    Electronic Resource
    Electronic Resource
    Fluids with internal degrees of freedom. II. Rayleigh–Brillouin scattering (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 4216-4220 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The extended thermodynamic treatment developed in part I for a fluid with internal degrees of freedom, is used to calculate its Rayleigh–Brillouin spectrum. A hydrodynamic model is first constructed which involves unspecified phenomenological coefficients. When these coefficients are identified in terms of experimental parameters, reasonably good agreement is obtained between the calculated and measured dynamic structure factor of CS2 at 20 °C with a density 1.262 g/cm3 and for k=8.608×10 cm−1. It is also shown that when the relaxation times of the trace and the nondeviatoric part of the stress tensor of the fluid tend to zero, the results previously derived by Mountain are recovered. The possible connections between this extended thermodynamic approach and Rytov's hydrodynamic theory are also hinted at.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451881
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  • 3
    Electronic Resource
    Electronic Resource
    The Enskog theory for multicomponent mixtures. IV. Thermal diffusion (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 963-975 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using the revised Enskog theory we derive equations for the thermal diffusion ratios kTi and thermal diffusion factors αij of multicomponent hard-sphere mixtures for systems in mechanical equilibrium. The first ten Enskog approximations to the thermal diffusion factor αij[N] (N=1,2,...,10) are evaluated numerically for a variety of system parameter choices appropriate to binary and ternary mixtures. We find that the first Enskog approximation does not vanish; the sequence of Enskog approximations converges most rapidly when the mass of the spheres are nearly equal. The seventh Enskog approximation was estimated to lie within about 1% of the exact value for all choices of system parameters. A comprehensive numerical study of the properties of the thermal diffusion factor for binary mixtures is given, including special mixtures such as the dusty gas, the Lorentz, quasi-Lorentz and Rayleigh gases, and isotopic mixtures. Particular emphasis is placed on showing how the properties of α12 change as the density is increased. The most striking difference between the low-density (Boltzmann) and high-density values for α12 is that the region of the mass ratio—diameter ratio plane for which α12 is either strictly positive or negative, as a function of composition, is much smaller at high densities. Also, at higher densities α12 is not a monotonic function of the mole fraction. For ternary mixtures in which two of the components are isotopes we show how the properties of the third component affect the separation of the two isotopes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452243
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  • 4
    Electronic Resource
    Electronic Resource
    Hydrodynamic effects in polymer solutions. I. Friction coefficients in steady elongational flow (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 7964-7969 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The hydrodynamic drag on the spherical beads of a dilute suspension of multibead–spring–rod chains immersed in a Newtonian solvent in steady elongational flow is calculated with the method of induced forces. Hydrodynamic interactions between the beads cause the drag to be anisotropic in space while the friction tensors exhibit a nonanalytic dependence on the velocity gradient when nonlinear terms in the quasistatic Navier–Stokes equation are considered. A discussion of the differences with the phenomenological form usually adopted in polymer dynamics is given and potential applications of the results in rheology are highlighted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454253
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  • 5
    Electronic Resource
    Electronic Resource
    Extended thermodynamic description of diffusion in an inert binary mixture (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 4099-4102 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The equilibrium concentration autocorrelation function for an inert binary mixture is calculated by means of extended irreversible thermodynamics. The ensuing generalized transport coefficient is explicitly evaluated and the corresponding k-dependent relaxation time is also obtained. The connection with neutron scattering experiments is suggested and expressions for the dynamic structure factor and the half-width dispersion relation are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449075
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  • 6
    Electronic Resource
    Electronic Resource
    Laser-Induced Glass-Crystallization Kinetics of GeSe2 Investigated by Light Scattering (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 452 (1985), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1985.tb30015.x
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  • 7
    Electronic Resource
    Electronic Resource
    Temperature effects in the Rayleigh problem for a convected Jeffreys fluid (1989)
    Springer
    Rheologica acta 28 (1989), S. 233-237 
    Details
    ISSN: 1435-1528
    Keywords: Non-linearviscoelasticity ; Jeffreys model ; non-isothermal effects ; Rayleigh problem ; irreversiblethermodynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract We use a thermodynamic approach to non-linear viscoelasticity which predicts a coupling between the stress tensor and the heat flux, to generalize the Rayleigh problem for an Oldroyd B model of a fluid. For a special choice of the external temperature gradient, we show that thermal effects do alter the hydrodynamic velocity field as well as the first and second normal stress differences. These quantities depend on renormalized parameters wich explicitly depend on temperature and on the strength of the coupling. In particular we find that in contrast to the isothermal situation, the second normal stress difference does not vanish. The possibility of an experimental verification of our theoretical predictions is also mentioned.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01332855
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  • 8
    Electronic Resource
    Electronic Resource
    Mixed monolayers composed of PC/PS/Chol. Interaction with opioid molecules (1989)
    Springer
    Colloid & polymer science 267 (1989), S. 139-144 
    Details
    ISSN: 1435-1536
    Keywords: Opiates ; monolayers ; phosphatidylserine ; phosphatidylcholine ; cholesterol ; penetration kinetics
    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 The miscibility of phosphatidylserine, phosphatidylcholine, and cholesterol in monolayers were studied. The influence of sodium and calcium ions in this system was determined. The compression isotherms of mixed monolayers of the above cited three components spread on subphases containing opiate molecules are elucidated. Moreover, the penetration kinetics of opiate molecules in these mixed monolayers was also recorded. The results show that the presence of cholesterol always lowers the penetration of opioid molecules; this effect is weaken for meperidine, the most hydrophobic of the molecules assayed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410352
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  • 9
    Electronic Resource
    Electronic Resource
    Linear viscoelasticity and irreversible thermodynamics (1986)
    Springer
    Rheologica acta 25 (1986), S. 207-213 
    Details
    ISSN: 1435-1528
    Keywords: Irreversible thermodynamics ; constitutive equation ; Maxwell model ; viscoelasticity ; auto-correlation function
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The underlying thermodynamic aspects of linear viscoelasticity are discussed. In particular, from the Extended Irreversible Thermodynamics theory we systematically derive the Maxwell model exhibiting its compatibility with thermo-dynamics and assessing its conditions of validity. We also calculate the equilibrium transverse velocity auto-correlation function and the frequency dependent shear viscosity. Nonlinear generalizations of our model are suggested and the possible role of extended thermodynamics in selecting constitutive equations is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01357948
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesis ofO 1.5-(β-D-galactopyranosyl) [DMet2, Hyp5] enkephalin amide, a new highly potent analgesic enkephalin-related glycosyl peptide (1989)
    Springer
    Cellular and molecular life sciences 45 (1989), S. 574-576 
    Details
    ISSN: 1420-9071
    Keywords: Analgesic peptides ; enkephalin analogues ; galactosylpeptides ; glycosylpeptides ; peptide synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A new series of O-glycosyl enkephalins has been prepared, following a convergent strategy, with high chemical yields. The galactosyl analogue,O 1.5-(β-D-galactopyranosyl) [DMet2, Hyp5] enkephalin amide proved to be one of the most potent in vivo opioid agonists synthesized up to now.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01990511
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