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  • Articles: DFG German National Licenses  (9)
  • 1995-1999  (6)
  • 1985-1989  (3)
  • Chemistry  (9)
  • ESR
  • 1
    Electronic Resource
    Electronic Resource
    Delaminationsverhalten von langfaserverstärkten thermoplastischen UD-Verbunden hergestellt aus unterschiedlichen Hybridgarnstrukturen (1997)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 28 (1997), S. 465-474 
    Details
    ISSN: 0933-5137
    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: Characterisation of the delamination behaviour of thermoplastic UD-composites made by different hybrid yarn structuresIn order to determine delamination behaviour of glass-fibre-reinforced polyamid composites the compression shear test and the DCB (Double Cantilever Beam)-, SEN- and NBT-test for mode-I- and the ENF (End Notched Flexure)-test for mode II-loading were used.By these tests the energy release rate G respectively K and the R cure (crack resistance curve) have been measured which characterise the crack resistance of the material against delamination.The composites were made by different hybrid yarn structures produced by air texturing (commingled yarn: COM), side-by-side arrangement (SBS), friction spinning (FS), Kemafil (KEM)- and Schappe(SCH)-technology. The influence of different glass fibre sizings was investigated.The results demonstrate the significant influence of different hybrid yarn structures and glass fibre coatings on fracture thoughness during crack propagation along the fibre/matrix interface. The best values were obtained for composites produced on the basis of commingled yarn structure.
    Notes: Zur Charakterisierung der Widerstandsfähigkeit gegen Delamination und Rißfortschritt wurde an thermoplastischen UD-Verbunden, die aus unterschiedlichen Hybridgarnstrukturen hergestellt worden sind, die Druckscherfestigkeit sowie interlaminare Bruch-zähigkeit mittels „Double Cantilever Beam“-Test (DCB), „Single Edge Notched“-Test (SEN) und „Notched Bending“-Test (NBT) für Mode I-Belastung und dem „End Notched Flexure“-Test (ENF) für Mode II-Belastung untersucht. Die Hybridgarnstrukturen unterscheiden sich ihrer Herstellugstechnologie entsprechend in der Anordnung der Verstärkungs-und thermoplastischen Matrixfilamente im Garn. In die Untersuchungen einbezogen wurden außerdem Verbunde mit unterschiedlicher Grenzschichtgestaltung. Ermittelt wurden die kritischen Energiefreisetzungstraten Gc bzw. die kritischen Spannungsintensitätsfaktoren Kc und für Mode I-Belastung die entsprechenden Rißausbreitungskurven, die die interlaminare Rißausbreitung charakterisieren. Die besten Ergebnisse wurden mit der lufttexturierten Hybridgarnstruktur erreicht.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19970281008
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    In situ microscopy for on-line characterization of cell-populations in bioreactors, including cell-concentration measurements by depth from focus (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 47 (1995), S. 106-116 
    Details
    ISSN: 0006-3592
    Keywords: in situ microscopy ; on-line biomass determination ; cell concentration ; depth from focus ; image analysis ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A new technique is presented which allows the use of a front-end sensor head for in situ and on-line characterization of cell concentration and cell size during fermentation. An epifluorescence microscope is mounted in a port of a bioreactor viewing directly into the agitated broth. Still images from cells are generated using pulsed illumination. They are directly visualized on a monitor and used for automatic image analysis. The cell concentration and morphological information are determined by counting and evaluating the cell images with respect to their depth from focus characteristic. An in situ microscope was successfully tested during yeast fermentations and yielded results which correlated well with results from a hemocytometer. © 1995 John Wiley & Sons, Inc.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260470113
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  • 3
    Electronic Resource
    Electronic Resource
    Dynamische Simulation der Wechselwirkung von Turbulenz und chemischer Reaktion am Beispiel der Chloroformpyrolyse (1995)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 67 (1995), S. 1131-1132 
    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
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330670971
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  • 4
    Electronic Resource
    Electronic Resource
    28. Direkte numerische Simulation des Mischverhaltens in zweidimensionalen turbulenten Strömungen (1999)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 71 (1999), S. 950-951 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    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/cite.330710932
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  • 5
    Electronic Resource
    Electronic Resource
    Dynamische Simulation von Mischung, Turbulenz und chemischen Reaktionen am Beispiel der Verbrennung halogenierter Kohlenwasserstoffe (1997)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 69 (1997), S. 1275-1276 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    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.330690992
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  • 6
    Electronic Resource
    Electronic Resource
    Fine structure of the glass transition in amorphous polymers. Part 2. Interpretation of the G″ peak and J″ peak by different molecular motionPart 1: Ref. [8] (1985)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 36 (1985), S. 273-278 
    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: Ein Überblick der Relaxationsphänomenologie in amorphen verschlauften Polymeren wird gegeben. Unter Benutzung einer allgemeinen Skalenhypothese werden den verschiedenen Zonen des multiplen Glasübergangs systematisch charakteristische Längen zugeordnet. Neue experimentelle Ergebnisse zeigen, daß auf einer gemeinsamen Frequenzskale die kalorischen Spektren zwischen den Maxima von G″ und J″ liegen. Eine Feinstruktur des Hauptübergangs wird vorgeschlagen. Es gibt zwei Komponenten: 1. Die eigentliche Glasübergangszone mit Modenlängen bis zu 2 nm. Diese Länge wird aus kalorischen Spektren erhalten. 2. Eine Behinderungszone der kooperativen Bewegung von Polymerkettensegmenten zwischen den Verschlaufungen mit Modenlänge bis zu 10 nm.
    Notes: A survey of transition phenomenology in amorphous entangled polymers is presented. Using a general scaling hypothesis characteristic lengths are systematically attached to the different zones of the multiple glass transition. New experimental results show the location of caloric spectra between the peaks of G″ and J″ on the common frequency scale. A fine structure of the main transition is suggested. There are two components: (i) The proper glass transition zone with mode lengths up to 2 nm. This length scale is determined from the caloric spectra. (ii) The hindering zone of cooperative motion of polymer chain segments between entanglement points with mode lengths up to 10 nm.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1985.010360510
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  • 7
    Electronic Resource
    Electronic Resource
    Fine structure of the glass transition in amorphous polymers. Part 1. Interpretation of shear curves with the aid of the fluctuation dissipation theorem (1985)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 36 (1985), S. 213-215 
    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: Die phänomenologische Interpretation der Scherkurven wird verfeinert durch die Anwendung des Fluktuation-Dissipation-Theorems und des WIENER-CHINČIN-Theorems. Die Verlustmaxima des Schermoduls und der Schernachgiebigkeit am Glasübergang amorpher Polymere können zwei verschiedenen molekularen Bewegungen zugeordnet werden. Eine Interpretation der zwei Maxima durch eine Art molekularer Bewegungen (uniformes Modell) würde implizieren, daß ihre Flanken in einer Entfernung von zwei logarithmischen Dekaden vom Zentrum signifikant intensiver wären als andere molekulare Bewegungen bei diesen Frequenzen.
    Notes: The phenomenological interpretation of shear curves is refined by application of the fluctuation dissipation theorem and the WIENER-KHINTCHIN theorem. The loss peaks of shear modulus and compliance near the glass transition of amorphous polymers can be attributed to two different molecular motions. An interpretation of the two peaks by one kind of molecular motion (uniform model) would imply that its flanks two logarithmic frequency decads away from the center were significantly more intensive than other molecular motions at these frequencies.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1985.010360408
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  • 8
    Electronic Resource
    Electronic Resource
    Unterschiedliche Meßsignale am Glasübergang amorpher Polymere. 1. Die Lage der charakteristischen Frequenzen quer zur Glasübergangszone (1986)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 37 (1986), S. 333-335 
    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: A general concept for the description of different relaxation measurements of the main transition (dynamic glass transition) is sketched. New experimental data of shear, dielectric and NMR relaxation, and of dynamic calorimetric (DSC) measurements are modelled according to this concept. The mutual arrangement of the characteristic frequencies obtained are represented for two amorphous polymers (poly(vinyl acetate) and polystyrene).
    Notes: Ein einheitliches Konzept für die Beschreibung unterschiedlicher Relaxationsmessungen des Hauptrelaxationsbietes (Glasübergang) wird skizziert. Experimentelle Werte von Schermessungen, dielektrischen Messungen, Kernresonanz-relaxationsmessungen und dynamischen kalorimetrischen Messungen (DSC) werden entsprechend modelliert. Die gegenseitige Lage der charakteristischen Frequenzen, die bei dieser Beschreibung erhalten werden, wird für zwei amorphe Polymere (PVAC, PS) dargestellt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1986.010370602
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  • 9
    Electronic Resource
    Electronic Resource
    Über grünes Bis-(2-Iminoisopropyl-thiophenolato)-nickel(II) und weitere, ähnliche NiII-KomplexeProfessor Herbert Schumann zum 60. Geburtstag gewidmet (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 1765-1772 
    Details
    ISSN: 0044-2313
    Keywords: Nickel ; Schiff base complexes ; synthesis ; crystal structure ; hydrogenase ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Green Bis-(2-iminoisopropyl-thiophenolato)nickel(II) and other Similar NiII ComplexesThe compounds [NiII(iitp)2] 1 (iitp = 2-iminoisopropyl-thiophenolate), [Ni2II(imptp)2] · 2 CH3OH 2, a dinuclear compound with an Ni—Ni distance of 276 pm, and [PPh4] · [NiII(imptp)(SCN)] 3 (imptp = 2-(2-iminopentane-4-on)-thiophenolate) have been prepared by the reaction of nickel(II)-acetate-tetrahydrate with 2-iminoisopropyl-thiophenole and 2-(2-iminopentane-4-on)-thiophenole in methanol, respectively. They have been characterized by single-crystal X-ray structure analysis and other physical methods. The redox behaviour of 1-3 has been studied in detail (chemically as well as by cyclovoltammetry and ESR spectroscopy). Particularly interesting are the electronic properties of 1 and its reduction with NaBH4 and the following reaction of the product with O2. The complexes are model compounds for some Ni-containing enzymes. For details of the crystal structure determination see “Inhaltsübersicht”.
    Notes: Die Verbindungen [NiII(iitp)2] 1 (iitp = 2-Iminoisopropyl-thiophenolat), [Ni2II(imptp)2] · 2 CH3OH 2, eine Zweikernverbindung mit einem Ni—Ni-Abstand von 276 pm und [PPh4][NiII(imptp)(SCN)] 3 (imptp = 2-(2-Iminopentan-4-on)-thiophenolat) wurden durch Umsetzung von Nickel(II)-acetat-tetrahydrat mit 2-Iminoisopropyl-thiophenol bzw. 2-(2-Iminopentan-4-on)-thiophenol in Methanol dargestellt und durch Einkristallstrukturanalyse und andere physikalische Methoden charakterisiert. Das Redoxverhalten der Verbindungen 1-3 wurde mittels elektrochemischer, chemischer und spektroskopischer Methoden untersucht. Bemerkenswert sind die elektronischen Eigenschaften der grünen Verbindung 1, sowie ihre Reduktion mit NaBH4 und die darauffolgende Umsetzung des Reaktionsproduktes mit O2. Die Verbindungen besitzen Modellcharakter für einige Ni-haltige Enzyme.1: C2/c, a = 1298,3(2); b = 695,7(1); c = 1958,7(3) pm; β = 103,92(1)°; V = 1717,4(5) · 106 pm3; R = 0,035 für 1230 unabhängige Reflexe (Fo 〉 4σ(Fo)), Z = 4.2: P1, a = 947,9(2); b = 1229,5(3); c = 1254,7(3) pm; α = 67,28(2), β = 74,63(2), γ = 81,18(2)°; V = 1298,4(5) · 106 pm3; R = 0,082 für 3655 unabhängige Reflexe (Fo 〉 4σ(Fo)), Z = 2.3: P21, a = 1119,3(2); b = 2389,7(4); c = 1245,8(2) pm; β = 102,52(1)°; V = 3253,0(9) · 106 pm3; R = 0,051 für 4218 unabhängige Reflexe (Fo 〉 4σ(Fo)), Z = 4.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966221022
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