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  • 1
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Interactive computer programs for the establishment and maintenance of a 1H-NMR. data base, the prediction of 1H-NMR. shifts and the rank-ordering of structural candidates based on comparison between observed and predicted spectra are presented. The programs take into account configuration, at stereocenters and double bonds, as well as diastereotopy. We demonstrate how, for purposes of structure elucidation, these new programs can be linked to the GENOA and STEREO programs.
    Additional Material: 13 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 24 (1982), S. 2766-2766 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A simple and reproducible quantitative method for measuring dissolved oxygen (DO) in uninfected and baculovirus infected cells in culture is described. To establish this method, an industrial DO measuring system for fermentation was employed. During this process the physical characteristics of the cell culture vessel were taken into account permitting a direct readout of DO in microliters per vessel. During these studies, it was experimentally documented that insect cells, particularly baculovirus infected cells, in culture from 1 to 14 days utilize an appreciable level of DO.
    Additional Material: 3 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 28 (1982), S. 325-333 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Chemical solution theory has been shown to be particularly well-suited for certain classes of liquid metal mixtures. A generalized formulation of this approach is presented and it eliminates the need for mechanistic information. The results are in good agreement with many data, and could lead to a variety of industrial applications of liquid metal solvents.
    Additional Material: 13 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 28 (1982), S. 474-479 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Transport rates were measured by monitoring the pressure decay between two reservoirs connected by a polyethylene membrane. The diffusion equation was integrated to obtain a relation between the pressure difference across the reservoirs and the time, with solubility, expressed by Henry's law constant H, and the diffusivity D as parameters. A procedure was developed whereby both H and D are evaluated from a single set of Δp vs. t measurements. For argon in low-density polyethylene, H and D at 323 K were 35[kg·mo]/(m3 of gas)/[kg·mol/(m3 of polymer)] and 2.1 × 10-10 m2/s, respectively. For the high-density sample these values were 38.7 and 1.11 × 10-10 at 298.1 K.
    Additional Material: 6 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 28 (1982), S. 751-759 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: An experimental and theoretical study was carried out to relate the extent of channeling in a packed column to the response in the effluent gas to a tracer input. When the response curve showed a distinct peak associated with a channel, it was possible to establish the flow rate and void area of the channel from only the response curve. The experimental data provided new information on Peclet numbers in packed columns with nonuniform void fractions (low tube-to-particle diameter ratios).
    Additional Material: 14 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 33 (1982), S. 77-82 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Detaillierte Untersuchung von zwei nichtrostenden Stählen nach 20 000 Stunden Oxidation in CO2/2% CO bei hohem DruckMit Hilfe von Rasterelektronenmikroskopie, Mikrosonde und Kernmikrosonde wurden zwei Proben von 18/8-Stählen eingehend untersucht; die Proben waren repräsentativ für die beiden Extreme des nach einem parabolischen Zeitgesetz bei 600°C gewachsenen Zunders. Auf dem im Vakuum angelassenen Stahl 316 erfolgte die Zunderbildung mit hoher Geschwindigkeit, wobei innen eine vorwiegend einheitliche Spinellschicht vorlag, jedoch mit einem chromreichen und nickelarmen Spinell (geheiltes Oxid) an der Grenzfläche Metall/Zunder. Das darunter befindliche Metall war stark aufgekohlt, wobei die Kohlenstoffkonzentration in der Nähe der Metalloberfläche etwa 1 Gew.-% betrug. Bei dem Material mit geringerer Verzunderungsgeschwindigkeit war die innere Zunderschicht komplexer aufgebaut und das Metall weniger stark aufgekohlt. Die Ergebnisse werden unter Berücksichtigung der Zusammensetzung der inneren Oxidschicht und der unter Ausheilung erfolgenden Schichtbildung erläutert, wobei dem dort vorliegenden Sauerstoffpotential der geschwindigkeitsbestimmende Einfluß zugeschrieben wird.
    Notes: Detailed examination has been carried out on two specimens of 18/8 steels representing the extremes of the rates of parabolic duplex scale growth at 600°C using metallography, scanning electron microscopy, microprobe and nuclear microprobe analysis.The high growth rate material, vacuum annealed 316, had an inner layer of mainly a uniform spinel but with a chromium rich low nickel spinel (healed oxide) at the metal interface. The underlying alloy was extensively carburised with a carbon concentration near the metal surface of ∼1 wt%. The low growth rate material had a more complex inner layer and a much lower degree of carburisation. The results are explained in terms of the composition of the inner oxide and the rate of healing layer formation being controlled by the prevailing oxygen potential there.
    Additional Material: 5 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 28 (1982), S. 190-195 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Previous investigations of liquid-to-particle mass transfer in trickle beds have used non-porous particles. However, the applications of trickle beds have been for reactions or adsorption employing porous catalysts as adsorbents. In this study a method of dynamic adsorption with porous particles is developed. The procedure is to extrapolate the response to a step-function input of non-volatile adsorbate to a short time where intraparticle diffusion and adsorption do not affect the overall process.The method is applied to the adsorption of benzaldehyde from aqueous solutions in a bed of granular, activated carbon particles. Measurements were made for three particle sizes, in adsorbers of two diameters, at 298K and 1 atm. The gas flow rate had no discernible effect on the mass transfer coefficients, kLsaLs, over a superficial velocity range of 1.47 to 8.0 × 10-2 m/s, but kLsaLs increased with liquid rate. The results, correlated as Sherwood vs. Reynolds number, agree well with the nonporous particle data of Van Krevelen and Krekels (1948), but suggest larger Sherwood numbers than similar data from later investigations.The wide range of mass transfer results for either liquid-to-particle or liquid-to-gas in trickle beds seems to be due in large measure to the difficulty in reproducing the rivulent flow pattern of liquid from bed to bed.
    Additional Material: 8 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 28 (1982), S. 1039-1040 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 28 (1982), S. 129-134 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Cyclic thermal regeneration of powdered activated carbon containing adsorbed sucrose was studied in fluidized beds at 1151° K and 101.3 kPa (1 atm). The regeneration process consists of three steps: (1) drying, (2), thermal decomposition, and (3), gasification of residual carbon with steam. The maximum restoration of adsorption capacity (98.5% recovery after each regeneration) was obtained when gasification removed an amount of carbon equal to the residual adsorbed carbon after thermal decomposition. It was verified that the time required to attain optimum regeneration could be determined from available kinetics data for the steam-carbon reaction. For our sucrose-activated carbon system this time was about 180 s at 1151°K.
    Additional Material: 12 Ill.
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