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  • Chemistry  (307)
  • ASTROPHYSICS  (96)
  • STRUCTURAL MECHANICS  (42)
  • Mice
  • 1990-1994
  • 1975-1979  (445)
  • 1976  (445)
  • 1
    Digitale Medien
    Digitale Medien
    Electronic computer solution for the MPN equation used in the determination of bacterial populations (1976)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 18 (1976), S. 1335-1335 
    Details
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260180912
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  • 2
    Digitale Medien
    Digitale Medien
    La résonance magnétique du 77Se dans des composés organiques (1976)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 8 (1976), S. 354-356 
    Details
    ISSN: 0030-4921
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: 77Se n.m.r. spectra of twenty-six organoselenium compounds, including some with an endocyclic selenium atom, have been recorded. Our measurements complete the scale of chemical shifts previously established by McFarlane. It seems difficult to define a range of chemical shifts which is characteristic of the valency state of selenium or of its endo- or exocyclic position. Some results are discussed qualitatively. In the case of selenolo[2,3-b]thiophene, evidence has been obtained for a 4J[Se, H] coupling across the sulphur atom.
    Notizen: La résonance magnétique du 77Se a été observée dans vingt-six composés organiques dont certains contiennent un atome de sélénium endocyclique. Nous avons pu ainsi compléter l'échelle de déplacements chimiques établie par McFarlane. II apparaît difficile de définir une gamme de déplacement chimique du 77Se caractéristique de son état de valence ou de sa position endo- ou exocyclique. Certains résultats sont discutés qualitativement. Dans le cas du sélénolo [2,3-b]thiophène, des arguments en faveur d'un couplage 4J(Se, H) à travers l'atome de soufre ont été découverts.
    Zusätzliches Material: 4 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1270080706
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  • 3
    Digitale Medien
    Digitale Medien
    Methods of calculating the physical acation of flame retardants (1976)
    New York, NY [u.a.] : Wiley-Blackwell
    Fire and Materials 1 (1976), S. 85-89 
    Details
    ISSN: 0308-0501
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Maschinenbau
    Notizen: The chemical mechanisms for the action of flame retardants are often mentioned in the literature but the physical modes of action are seldom. Discussed. This article presents one way to quantify their efficiency. The technique is based on literature data for the physical and thermal properties of flams retardants for temperatures from 25°C up to 1000°C. The prolongation of the time to ignition by heat absorption by the retardant and the amount of inert gas evolved by the retardant are calculated at a given radiation for a material flame-proofed with a given amount of the flame retardant. The ability to form an insulating surface layer is considered but not quantified. It is assumed that a medium density wood fibre building boards is treated with 2 kg of flame retardant per m2. The flame retardants included are borates, boric acid, phosphates and silicates. The board is assumed to be irradiated with an intensity of 15 k W m-2. Under these conditions an untreated board ignites after 6-7 min. The time to ignition is prolonged by 1-5 min through heat absorption by the different retardants, and the amount of inert gases evolved may be as high as 2.6 m3 per m2 board. The formation of an insulating surface layer is more difficult to quantify. The results confirm the importance of the physical modes of action of flame retardants and the technique could form the basis for evaluating materials in simulated fire situations.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/fam.810010302
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  • 4
    Digitale Medien
    Digitale Medien
    Ultrahigh molecular weight polyethylene as used in articular prostheses (a molecular weight distribution study) (1976)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 20 (1976), S. 809-812 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Currently there is widespread use of ultrahigh molecular weight polyethylene (UHMWPE) acetabular components in total joint replacement prostheses. What has been most surprising about the wear of UHMWPE under such circumstances is the occurrence of brittle fracture. Such fracture had not been observed in the usual engineering tests done in the laboratory on UHMWPE. It was only when prosthese which had been removed from patients were examined or run in hip joint simulators with serum or synovial fluid as the lubricant, that brittle fracture was encountered. The problem of environment-enhanced brittle fracture in plastics dates back to 1946. Interestingly, the phenomenon was first described in polyethylene. The prime variables involved are polymer molecular weight, sensitizing environment, stress filed, and temperature. Other things being equal, brittle behavior in polyethylene is extremely sensitive to the amount of low molecular weight polymer present. In the light of the foregoing we have studied the molecular weight distribution in six commercially available UHMWPE components. These were obtained from six different manufacturers. The specimens were characterized both on their bearing (wear) surfaces and in their interior bulk. The results obtained indicate that: 1The UHMWPE components contain substantial amounts of low molecular weight polymer.2The UHMWPE components differ significantly in molecular weight distribution.3The UHMWPE components contain substantial amounts of crosslinked polymer.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1976.070200321
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  • 5
    Digitale Medien
    Digitale Medien
    Kinetic analysis of Penicillin production by semicontinuous fermenters (1976)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 18 (1976), S. 473-492 
    Details
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: The relationships between the specific rate of nutrient consumption and biomass growth and between the specific rate of penicillin production and oxygen concentration in the broth are analyzed.The functional dependencies which have been obtained from the experimental data of industrial fermenters are used with the mass balances to develop a model of the behavior of semicontinuous operations. The proposed model allows one to study the influence of some operational parameters.The obtained results agree with the data of industrial processes.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260180404
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  • 6
    Digitale Medien
    Digitale Medien
    The Influence of oxygen concentration and of specific rate of growth on the kinetics of Penicillin production (1976)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 18 (1976), S. 493-512 
    Details
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: The role of fundamental parameters in the conduction of penicillin semicontinuous fermentations is analyzed. Biomass concentration, penicillin production, and main nutrient consumption are particularly studied. Furthermore, the conduction of the operation is simulated with regard to conditions of constant specific rate of growth and of constant oxygen concentration in the broth. An intermediate condition is also considered.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260180405
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  • 7
    Digitale Medien
    Digitale Medien
    Inhibitoren der Korrosion 19 (1). Autoxidationsstudien an Fe2+-Trimethylen-1,3-bis-phosphonat als Modell einer die Korrosion inhibierenden DeckschichtHerrn Kollegen Prof. Dr. Werner Kern zur Feier seines 70. Geburtstages am 9. Februar 1976 mit herzlichem Dank für eine langjährige kollegiale Zusammenarbeit gewidmet. (1976)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 27 (1976), S. 223-227 
    Details
    ISSN: 0947-5117
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Beschreibung / Inhaltsverzeichnis: Inhibitors of corrosion 19 (1). Autoxidation studies on Fe2+-trimethylene-1,3-bisphosphonate as a model of a corrosion inhibiting surface layerThe autoxidation rate of Fe2+ salts depends on the pH value and is practically equal to zero at pH 2 and very high at pH 5-7. Addition of trimethylene-1,3-bis-phosphonic acid slows down autoxidation and gives rise to an increase in oxygen consumption; this resulting consumption is higher than might be explained by the stoichiometry of the Fe2+ oxidation. This fact may be explained by the oxidative conversion of trimethylene-1,3-bis-phosphonic acid to phosphoric acid with salts of trivalent iron being precipitated. These Fe3+-bis-phosphonates are precipitated in a tridimensional network; the Fe:P ratio is between 0.5 and 0.9 and the Fe:P ratio is between 0.5 and 0.9 and decreases as the pH of the system is decreased.
    Notizen: Die Autoxidationsgeschwindigkeit der Fe2+. Salze ist stark abhängig vom pH und ist bei pH 2 praktisch gleich Null, bei pH 5-7 sehr hoch. Durch Zusatz von Trimethylen-1,3-bis-phosphonsäure wird die Autoxidation etwas verlangsamt und der Sauerstoffverbrauch stärker erhöht als es der Stöchiometrie der Fe2+-Oxidation entspricht. Dieser Umstand erklärt sich durch den oxidativen Abbau der Trimethylen-1,3-bis-phosphonsäure zu Phosphorsäure, wobei Salze des dreiwertigen Eisens als Niederschlag ausfallen. Diese Fe3+-bis-phosphonate sind dreidimensional vernetzt; das Fe:P-Verhältnis liegt zwischen 0.5 und 0.9 und wird mit abnehmendem pH-Wert geringer.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/maco.19760270402
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  • 8
    Digitale Medien
    Digitale Medien
    Drop size distributions and coalescence frequencies of liquid-liquid dispersions in flow vessels (1976)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 22 (1976), S. 289-297 
    Details
    ISSN: 0001-1541
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: A flash photomicrographic method and modified dye-light transmittance technique are employed to measure size distributions and mixing frequencies in a turbulently agitated flow vessel. This liquid-liquid dispersion is nearly spatially homogenous. Mixing frequencies are strongly dependent on impeller speed and moderately dependent on holdup fraction.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/aic.690220211
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  • 9
    Digitale Medien
    Digitale Medien
    An examination of the adaptive random search technique (1976)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 22 (1976), S. 744-750 
    Details
    ISSN: 0001-1541
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Random search procedures have recently been successfully applied to the optimization of a variety of chemical engineering problems, including optimization of chemical processes by flow sheet simulation. These procedures represent the independent variables as random variables described by probability distributions. The adaptive random search procedure centers the distribution for each variable about the best search point found and examines this region for a better point. Thus, this technique has the ability of continuously moving the search region toward the optimum, which is particularly advantageous in following constraints.This study examines the efficiency of the adaptive random search technique as applied to six different problems, which have been previously solved by various other techniques.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/aic.690220417
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  • 10
    Digitale Medien
    Digitale Medien
    Denitrification kinetics in packed beds (1976)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 22 (1976), S. 851-855 
    Details
    ISSN: 0001-1541
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Bench scale packed columns were used to study the kinetic behavior of biological denitrification. After tracer studies were run to determine flow characteristics, steady state nitrate profiles were determined. A first-order rate expression with an Arrhenius temperature dependence is an adequate model of the reaction for nitrate-nitrogen concentrations of 〈 100 mg/l and temperature of 5° to 20°C. The rate constants are proportional to the packing surface area.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/aic.690220506
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