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  • 1
    Electronic Resource
    Electronic Resource
    Infinite dilution fugacity coefficients and the general behavior of dilute binary systems (1986)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 32 (1986), S. 1253-1262 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A universally valid formal expression for the composition dependence of solute and solvent fugacity coefficients in any dilute binary system far from criticality is derived in this paper. In the present context, dilution denotes the y1 → O limit, regardless of the mixture's molar density. The results are independent of the system under study and of the choice of equation of state. The solute fugacity coefficient is simply the product of a composition-independent term (the infinite dilution fugacity coefficient) and an exponential decay composition correction. These two parameters have important thermodynamic implications: their temperature and pressure derivatives are related to the solute's partial molar enthalpy and volume, respectively. When applied to activity coefficients, the same theoretical analysis yields universal relationships for the composition dependence of activity coefficients which can be used as consistency checks for empirical correlations. The relationship between infinite dilution activity and fugacity coefficients can be used to estimate relative solubilities of a given solute in different solvents. Excellent agreement is found when the theoretical expressions are tested with three different binary systems involving a nonvolatile solid solute and a supercritical fluid.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690320804
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  • 2
    Electronic Resource
    Electronic Resource
    Derivation of the relationships between partial derivatives of legendre transforms (1986)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 32 (1986), S. 1224-1226 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690320723
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  • 3
    Electronic Resource
    Electronic Resource
    The molecular basis of temperature effects in supercritical extraction (1988)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 34 (1988), S. 645-657 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The behavior of solute partial molar enthalpies in dilute supercritical mixtures gives rise to the well-known phenomenon of retrograde solubility (equilibrium solubility decreasing with increasing temperature at constant pressure). A mechanistic interpretation of this phenomenon in terms of the formation of large clusters of solvent molecules around solute molecules is consistent with experimentally observed retrograde behavior. Cluster formation occurs as a consequence of the unbounded increase in the solvent's compressibility arbitrarily close to the latter's critical point. At infinite dilution, the solute's partial molar volume and enthalpy grow linearly with cluster size. This means that the negative divergence of these quantities is simply a macroscopic manifestation of a “condensation” in which an increasing number of solvent molecules cluster around solute molecules. Arbitrarily close to the solvent's critical point, scaling relationships show that the decay of both solvent-solvent and solute-solvent correlation functions exhibits the same radial dependence. This functionality is thus solute-independent, and is determined exclusively by the proximity to the solvent's critical point. The locus along which thermal effects associated with cluster formation are maximized is arbitrarliy close to the solvent's critical isochore as the latter's critical point is approached.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690340414
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  • 4
    Electronic Resource
    Electronic Resource
    Intensification of mass transfer in aqueous two-phase systems (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 41 (1993), S. 72-78 
    Details
    ISSN: 0006-3592
    Keywords: aphrons ; aqueous two phase ; enzyme ; extraction ; intensification ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A novel technique which intensifies conventional aqueous two-phase extraction by conversion of dispersed phase into colloidal gas aphrons (CGAs) has been developed for extraction of an enzyme. In the present work, amyloglucosidase (1,4-α-D-glucan glucohydrolase) was extracted using a polyethylene glycol-sodium sulfate-water system. The lighter phase, i.e., polyethylene glycol (PEG) rich phase, was converted into CGAs which were then dispersed into a salt rich phase. The effect of type of surfactant and its concentration, dispersed phase velocity, phase composition, and type of sparger on the dispersed phase mass transfer coefficient was investigated. The results suggests 9-16 times higher values of mass transfer coefficient compared to spray column. The multiorifice sparger at concentrations of 0.33 g/L of cetyl trimethyl ammonium chloride yielded best results. © 1993 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260410110
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  • 5
    Electronic Resource
    Electronic Resource
    Indications of an indirect process in the double ionization of carbon disulphide (1988)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 2 (1988), S. 90-91 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290020506
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  • 6
    Electronic Resource
    Electronic Resource
    How are S2+· ions formed in electron collisions with linear S=C=S? (1989)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 3 (1989), S. 24-26 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The energetics of S2+· ion formation in electron dissociative ionization of linear CS2 are investigated experimentally with a crossed-beam apparatus. Ab initio self-consistent-field molecular orbital (SCF MO) calculations of potential energy curves for low-lying electronic states of this ion have been made in order to explain how stable S2+· ions are formed, initially at the very large internuclear separation of 3.2 Å.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290030204
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  • 7
    Electronic Resource
    Electronic Resource
    Study on the curing between shellac and melamine resin by dielectric measurements (1984)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 127 (1984), S. 211-214 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Härtungsreaktion zwischen Schellack und Melaminharz wurde in der löslichen Stufe durch Messen des Streufaktors (tan δ) bei 100 kHz verfolgt. Es wurde gefunden, daß die zeitabhängige Messung des Streufaktors gut zur Bestimmung der Härtungszeit der Schellack-Melaminharz-Mischung geeignet ist.
    Notes: The curing between shellac and melamine resin was investigated in the solution stage by the measurement of dissipation factor (tan δ) at 100 kHz. It was found that the measurement of dissipation factor with time can be conveniently used for the determination of cure-time of shellac-melamine resin blends.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1984.051270118
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  • 8
    Electronic Resource
    Electronic Resource
    Study on the curing of shellac with epoxy resins by dielectric measurements (1984)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 126 (1984), S. 145-152 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Härtung von Schellack mit Epoxidharzen wurde in Lösung durch zeitabhängige Messung des Streufaktors (tan δ) und der Leitfähigkeit bei 100 kHz verfolgt. Die zeitliche Änderung der Durchschlagfestigkeit und der spezifischen Viskosität wurden ebenfalls untersucht. Diese Untersuchungen ergaben, daß der größte Teil der Härtung von Schellack mit Epoxidharzen bei niederen Temperaturen innerhalb von sechs Tagen nach der Mischung der beiden Komponenten stattfindet. Es wurde eine merkliche Verbesserung der Durchschlagfestigkeit bei den Mischungen beobachtet. Die Ergebnisse lassen den Schluß zu, daß die zeitabhängige Messung der Durchschlagfestigkeit vorteilhaft zur Verfolgung des Härtungsverlaufs bei Schellack/Epoxidharz-Mischungen eingesetzt werden kann.
    Notes: The curing of shellac with epoxy resins was investigated in the solution stage by measurement of dissipation factor (tan δ) and conductivity at 100 kHz with time. The variation of dielectric strength and specific viscosity of different shellac-epoxy resin blends with time was also investigated. The study has revealed that most of the curing of shellac with epoxy resins in the cold takes place within around six days after blending of the two varnishes. An appreciable improvement in the dielectric strength of the blends was observed. The results suggest that the measurement of the dissipation factor with time may be conveniently used for the study of the curing behaviour of shellac-epoxy resin blends.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1984.051260115
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetohydrodynamic flow past a porous rotating disk in a circular magnetic field (1988)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 8 (1988), S. 659-669 
    Details
    ISSN: 0271-2091
    Keywords: Magnetohydrodynamics ; Homotopy ; Quasi-Newton ; Rotating disk ; 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: This paper studies the effects of a circular magnetic field on the flow of a conducting fluid about a porous rotating disk. Using modern quasi-Newton and globally convergent homotopy methods, numerical solutions are obtained for a wide range of magnetic field strengths, suction and injection velocities and Alfven and disk speeds. Results are presented graphically in terms of three non-dimensional parameters. There is excellent agreement with previous work and asymptotic formulae.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650080604
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  • 10
    Electronic Resource
    Electronic Resource
    Mathematical modeling of natural convection in fire - A state of the art review of the field modelling of variable density turbulent flow (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Fire and Materials 7 (1983), S. 1-24 
    Details
    ISSN: 0308-0501
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Architecture, Civil Engineering, Surveying , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This review concerns the mathematical modeling of fire phenomena. The fire is treated as a head and mass source driving a fluid flow process. Combustion is not included. It deals in detail with the field modeling approach incorporating the effects of turbulence, strong buoyancy and variable density on the transport of momentum, heat and mass. For the sake of simplicity, other effects such as those due to the interactions of the above mechanisms with the wall, radiation, etc., which may be crucial to the dynamics of the fire phenomenon, are not dealt with in this review. These effects will be the subject of future work.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fam.810070102
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