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  • 1
    Electronic Resource
    Electronic Resource
    Modellrechnungen zu Explosionen freier Gaswolken von Kohlenwasserstoff/Luft-GemischenVortrag von F. Ebert auf der GVC-Tagung „Sicherheit in der Chemischen Technik“, 25./26. Febr. 1982 in Düsseldorf. (1982)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 54 (1982), S. 736-741 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Model calculations on the explosion of free gas clouds containing mixtures of hydrocarbons and air. The procedure presented permits a description of continuously and discontinuously accelerated explosions. The explosions considered are deflagrations, i. e. combustion-supported compression waves. It is possible to calculate, for a given rate of propagation of a flame front or the motion of a piston assigned in a model, the corresponding flow field (compression wave). The corresponding pressure, density, and velocity distributions can be utilized for safety considerations. Application of the results requires that the simulated acceleration processes can be transformed into real events. With the experimental results presently available this is possible only in very crude fashion and can serve only as a rough preliminary guide.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330540808
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  • 2
    Electronic Resource
    Electronic Resource
    On the kinetics and mechanism of thermal degradation of polystyrene (1982)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 183 (1982), S. 1207-1218 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The thermal degradation of polydisperse polystyrene samples with mol. wts. (M̄n) between 60000 and 22000 has been investigated at different temperatures under oxygen free conditions. Product analysis has been carried out by GPC. The experimental degradation could be simulated by a model consisting of scission and depolymerization. The dynamical behaviour of this model is expressed in a matrix from. The ratio of scission and depolymerization is constant for all polymers and different temperatures during degradation. Therefore, a master curve could be evaluated, which gives a general relation between the decrease of mol. wt. and the mass of volatiles. Finally a radical chain mechanism has been proposed in a lumped form which is consistent with the kinetic model and the experimental results.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1982.021830514
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  • 3
    Electronic Resource
    Electronic Resource
    Untersuchungen zur turbulenzbedingten TropfenkoaleszenzVortrag von F. Ebert auf dem Jahrestreffen der Verfahrens-Ingenieure, 30. Sept. bis 2. Okt. 1981 in Düsseldorf. (1982)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 54 (1982), S. 517-517 
    Details
    ISSN: 0009-286X
    Keywords: turbulente Mehrphasenströmung ; Koagulation ; Kondensation ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330540519
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  • 4
    Electronic Resource
    Electronic Resource
    Berechnung des Leistungsbedarfs von kohäsionslosen Schüttgütern in diskontinuierlich betriebenen Dünnschichtapparaten (1982)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 54 (1982), S. 524-525 
    Details
    ISSN: 0009-286X
    Keywords: Trocknung ; Schüttgüter ; Dünnschichtapparate ; Leistungsbedarf ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330540523
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  • 5
    Electronic Resource
    Electronic Resource
    The antiplatelet activity of immobilized prostacyclin (1982)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 16 (1982), S. 629-638 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Owing to the chemical instability of prostacyclin, the direct immobilization of thsi prostaglandin has not been successful. A new procedure is described for the preparation of immobilized prostacyclin based on the conversion of immobilized prostaglandin F2α to immobilized prostaglandin I2. Materials thus prepared show dramatic antiplatelet effects with regard to platelet aggregation and platelet adhesion. Radioimmunoassays of plasmas used in in vitro platelet tests and of buffers used in prostacyclin leakage studies established that these effects are not due to the release of prostacyclin from the respective immobilization substrates.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820160510
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  • 6
    Electronic Resource
    Electronic Resource
    Untersuchungen zum Einfluß einer Oberflächenmodifizierung von Fasermaterialien im nichtthermischen Plasma einer Hochfrequenz-Entladung auf die Adhäsionsfestigkeit zu Epoxidharz. Teil II. Veränderungen der Struktur von Glasfasern nach PlasmabehandlungTeil I: siehe [1] (1981)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 32 (1981), S. 36-40 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Fibres of boron-silicate-glass are destructed at the surface by ion bombardment from plasma of a radio-frequency glow discharge. The alkaline elements are sputtered away, but partly readsorbed as hydroxides. The strength of fibres decreases strongly on shorttime of plasma exposition. In a plasma of ammonia N-containing groups are formed on the surface of fibres.
    Notes: Borsilicatglasfasern werden durch den Beschuß mit Ionen aus dem Plasma einer Hochfrequenz-Glimmentladung oberflächlich umstrukturiert. Die Alkalielemente werden bevorzugt herausgesputtert und z. T. in Hydroxidform wieder abgelagert. Die Fasern verlieren auch nach nur kurzer Plasmabehandlungszeit stark an Eigenfestigkeit. Bei Behandlung im NH3-Plasma bilden sich an der Faseroberfläche N-haltige funktionelle Gruppen.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1981.010320109
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  • 7
    Electronic Resource
    Electronic Resource
    23Na-NMR-Untersuchungen zur Natriumbindung bei der Behandlung von Baumwolle mit Natronlauge (1981)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 32 (1981), S. 179-181 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1981.010320311
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  • 8
    Electronic Resource
    Electronic Resource
    Mößbauer- und EPR-spektroskopische Untersuchungen hydrothermal behandelter A-Zeolithe (1982)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 486 (1982), S. 229-239 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on Hydrothermal Treatment of A-Zeolites by Mössbauer and ESR SpectroscopyThe influence of hydrothermal treatment on the structure of primary pores of A-zeolites was systematically investigated by ESR and Mössbauer spectroscopy. The structure of primary pores of these zeolites was modified by Mg2+, Li+ and paramagnetic Fe3+ ions incorporated into the initial zeolite.Coordinations and positions of the iron ions inside of the large cavity were investigated by ESR; magnetically ordered and not magnetically ordered phases of iron on the surface of the zeolites were identified by Mössbauer spectroscopy.The hydrothermal stability of A-zeolites is essentially lowered by Mg2+ cations at high degrees of iron exchange. On the other hand the hydrothermal treatment only changes positions of the iron ions and the mass ratios and particle sizes of the iron phases on the surface of the crystallites. The hydrothermal stability of the structure of primary pores is not influenced thereby.
    Notes: Mit Hilfe der EPR- und der Mößbauerspektroskopie wurden systematische Untersuchungen des Einflusses einer Hydrothermalbehandlung auf die Primärporenstruktur von A-Zeolithen vorgenommen. Die Modifizierung der Primärporenstruktur dieser Zeolithe erfolgte durch gezielten Einbau von Mg2+- und Li+-Kationen sowie paramagnetischer Fe3+-Ionen.Durch EPR-Messungen konnten Koordinationen und Positionen der im großen Hohlraum befindlichen Eisenionen angegeben werden, während mit Hilfe der Mößbauerspektroskopie sowohl magnetisch ungeordnete als auch magnetisch geordnete Eisenphasen auf der Zeolithoberfläche identifiziert wurden.Die hydrothermale Stabilität von A-Zeolithen wird durch Mg2+-Ionen bei höheren Ionenaustauschgraden wesentlich vermindert. Im Gegensatz dazu werden durch die Hydrothermalbehandlung bei den im Zeolithen befindlichen Eisenionen nur deren Kationenpositionen und bei den auf der Kristallitoberfläche entstandenen Eisenphasen deren Massenverhältnisse und Teilchengrößen verändert. Die hydrothermale Stabilität der Primärporenstruktur von A-Zeolithen wird dadurch nicht beeinflußt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19824860127
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  • 9
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Wechselwirkung von Quarz mit H2 unter Einwirkung mechanischer Energie. III temperaturprogrammierte DesorptionTeil I und II s. [7, 8]. (1982)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 484 (1982), S. 221-230 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigation of the Interaction of Quartz with H2 under Supply of Mechanical Energy. III. Temperature-programmed DesorptionThe thermodesorption of H2 from quartz, which has been mechanically stressed under H2, show one relatively broad main peak with a maximum between 760 and 580 K. Increasing degree of disorder of the solid shifts the maximum towards lower temperatures. The H2 thermodesorption may be explained as an activated diffusion process in the partially crystalline quartz. It is considered in connexion with structural and other changes of the quartz, e. g. with the concentration decreases of ≡Si· and =SiH/=SiOH radicals as well as ≡SiH and ≡SiOH groups.
    Notes: Die H2-Thermodesorption von in H2 mechanisch bearbeitetem Quarz weist einen relativ breiten Hauptpeak mit einem Maximum zwischen 760 und 580 K auf. Das Maximum wird mit steigendem Störgrad des Festkörpers zu tieferen Temperaturen verschoben. Die H2-Thermodesorption kann als aktivierter Diffusionsprozeß im partiell-kristallinen Quarz erklärt werden und wird in Verbindung mit strukturellen und anderen Veränderungen am Quarz, z. B. dem Abbau von ≡Si· - und =SiH-/=SiOH-Radikalen sowie ≡SiH- und ≡SiOH-Gruppen verfolgt.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19824840122
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