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  • Artikel  (16)
  • 1980-1984  (16)
  • 1850-1859
  • Allgemeine Naturwissenschaft  (10)
  • Maschinenbau  (5)
  • Wirtschaftswissenschaften  (1)
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  • Artikel  (16)
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  • 1
    Digitale Medien
    Digitale Medien
    Traditional Participation in a Modern Political System — the Case of Western Nigeria (1980)
    Cambridge : Cambridge University Press
    The @journal of modern African studies 18 (1980), S. 443-468 
    Details
    ISSN: 0022-278X
    Quelle: Cambridge Journals Digital Archives
    Thema: Ethnologie , Geschichte , Politikwissenschaft , Wirtschaftswissenschaften
    Notizen: The constitutional development of Nigeria which started under the British occupation has been marked by two fundamental principles: the decision to set the political evolution of the country on a federal basis, and the effort, far less successful, to integrate the traditional institutions into a modern political system. This second principle will be the subject of this article, which I hope will also shed some light on the complex relationships between tradition and modernity, and thus show the importance of ‘primordial loyalties’ in political life.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1017/S0022278X00011605
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    IR flashes from the X-ray rapid burster (1980)
    [s.l.] : Nature Publishing Group
    Nature 283 (1980), S. 550-551 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The rapid burster was discovered in 1976 by Lewin et al.2 at MIT and is unique in producing 103 X-ray bursts a day in its active periods. These periods occur about every 6 months and last 2-6 weeks3. Liller4, and Kleinmann et al.5 have shown that the source lies in a compact globular cluster, now ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/283550a0
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Anilides and the Spanish toxic oil syndrome (1982)
    [s.l.] : Nature Publishing Group
    Nature 298 (1982), S. 608-608 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] DURING May and June, 1981, an epidemic outbreak of interstitial pneumonitis occurred in Spain. Over 20,000 people were affected, and nearly five per cent subsequently developed persistent neuro-distrophic- and schlerodermia-like conditions. More than 300 people have died. The disease, at first ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/298608a0
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  • 4
    Digitale Medien
    Digitale Medien
    PLATELETS ADHERE WHERE FLOW HAS LEFT FIBRINOGEN ON GLASS (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 416 (1983), S. 0 
    Details
    ISSN: 1749-6632
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1749-6632.1983.tb35208.x
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  • 5
    Digitale Medien
    Digitale Medien
    Melt behaviour of poly(ethylene oxide)-poly(vinyl acetate) blends (1982)
    Springer
    Polymer bulletin 7 (1982), S. 295-301 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary The compatibility of blends of poly(vinyl acetate) and poly(ethylene oxide) has been studied by rheological and thermo-optical analysis. Results from experiments point to the conclusion that there is extensive mixing between the segments of the two macromolecules in the blend. The interaction between the two polymers is manifested by a decrease in the melting point and a continuous decrease in viscosity with decreasing POE content in the mixture.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00256796
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Polymerization by phase transfer catalysis (1984)
    Springer
    Polymer bulletin 11 (1984), S. 493-496 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary Polyethers from 1,4-bis(chloromethylene)-2,5-dimethoxybenzene and 4,4′-biphenol were obtained by phase transfer catalysis, using different catalysts and solvents. The molecular weights and yields were determined, showing a solvent effect and a influence of the catalysts used.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01045326
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  • 7
    Digitale Medien
    Digitale Medien
    Spanish “toxic-oil” syndrome (1983)
    [s.l.] : Nature Publishing Group
    Nature 302 (1983), S. 472-472 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] SIR - In their dual aetiology hypothesis for the Spanish toxic oil syndrome1, Root-Bernstein and Westall fail to distinguish between theories and scientific facts. This is precisely one of the major problems we are encountering in Spain when dealing with the several aetiological hypotheses which ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/302472a0
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  • 8
    Digitale Medien
    Digitale Medien
    A pseudo α -helix from poly( α -isobutyl-L-aspartate), a nylon-3 derivative (1984)
    [s.l.] : Nature Publishing Group
    Nature 311 (1984), S. 53-54 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Fig. 1 Comparison of a segment of a nylon-3 derivative of the type described here (a) with a peptide unit in a protein (b). In a, R=COOCH2CH(CH3)2. The lateral group R is on the opposite side to that in proteins, as it would be in polypeptide chains prepared from D-amino acids. The polymer was ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/311053a0
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Polymer conformation and viscometric behaviour (1983)
    Springer
    Polymer bulletin 10 (1983), S. 264-270 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary The viscometric and refractometric behaviour of poly (benzyl methacrylate) (PBM) in isobutyl methyl ketone (IMK) as a function of the temperature was studied. The viscometric relations in IMK and toluene by membrane osmometry and GPC at 25°C were established. The viscometric results show discontinuities in the intrinsic viscosity [η] in IMK and sharp changes in the conformational and thermodynamic parameters Kθ and B. The variation on the unperturbed dimensions of the polymer chain was attributed to a conformational transition. The influence of the side groups was analyzed. The conformational behaviour of this polymer was compared with the saturated corresponding poly (cyclohexyl methyl methacrylate).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00272234
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  • 10
    Digitale Medien
    Digitale Medien
    The role of coupling agents on the mechanical properties of polymer-impregnated mortars (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 27 (1982), S. 2151-2165 
    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: An investigation has been carried out for determining the effect of coupling agents on the mechanical properties of polymer-impregnated mortars. Mortar specimens were impregnated with methyl methacrylate (MMA) monomer and α, α-azobis-isobutyronitrile initiator, and polymerized thermally in water. Three titanate coupling agents, KR-33CS, KR-55, and KR-138s, and one silane coupling agent, the A-174, were used for the investigation. Varying amounts of coupling agent were used in impregnating the mortars in situ or in pretreating the mortars with a solvent system. Bulk polymerization of MMA shows no appreciable influence of the coupling agents in the reaction kinetics; however, with the exception of KR-138S, all polymers obtained in the presence of coupling agents came out as insolble. Similar results were obtained for polymers extracted with acetone from mortars. The mechanical property results show an improvement of properties in mortars containing 5.0 vol% of KR-33CS and A-174 after impregnation in situ. A slightly better improvements of mechanical properties were obtained by pretreating the mortar specimens with acetone or toluene/xylene containing coupling agents. Microscopic observation of the fracture surface showed no noticeable difference in the surfaces prepared with and without coupling agents.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1982.070270626
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