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  • 1980-1984  (12)
  • 1960-1964
  • 1983  (7)
  • 1982  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Annelation of cyclic dienes to amino- and azabicyclic diols by iterated cycloadditions of nitrones (1982)
    s.l. : American Chemical Society
    The @journal of organic chemistry 47 (1982), S. 857-863 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00344a021
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  • 2
    Electronic Resource
    Electronic Resource
    Molybdenum nuclear magnetic resonance studies of trifluorophosphine complexes (1982)
    s.l. : American Chemical Society
    Inorganic chemistry 21 (1982), S. 2085-2087 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00135a072
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  • 3
    Electronic Resource
    Electronic Resource
    Conceptual Problems Associated with the Evaluation of Educational Technology Courses (1982)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of educational technology 13 (1982), S. 0 
    Details
    ISSN: 1467-8535
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Education
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1467-8535.1982.tb00427.x
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  • 4
    Electronic Resource
    Electronic Resource
    Kinetics of Product Formation and Plasmid Segregation in Recombinant Microbial Populations (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 413 (1983), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1983.tb47879.x
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  • 5
    Electronic Resource
    Electronic Resource
    Generation of thermal strains in GRP (1983)
    Springer
    Journal of materials science 18 (1983), S. 1533-1539 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The temperature dependence of the thermal strains in the longitudinal direction of the transverse ply ε tl th , of 0°/90°/0° epoxy and polyester laminates, has been determined from the thermal variation of the deflection of an unbalanced beam. These results have been compared with those predicted from known values of the linear expansion coefficients,α t andα l. There is good agreement between the experimental and calculated values of thermal strain for the epoxy composite. Good agreement for the polyester laminates can only be obtained when the values ofα t used are those for wet laminates. The large thermal strains previously reported for the polyester laminates can therefore be explained by small quantities of water in the matrix which are not readily removed during post-curing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01111974
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  • 6
    Electronic Resource
    Electronic Resource
    Generation of thermal strains in GRP (1983)
    Springer
    Journal of materials science 18 (1983), S. 1522-1532 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The temperature dependence of the linear expansion coefficients in the longitudinal (α l) and transverse directions $$(\alpha _{t_1 } and \alpha _{t_2 } )$$ of unidirectional glass fibre laminates and their matrix resins (α m) has been studied. The results for the dry, fully post-cured polyester, epoxy resins and laminates have been found to be consistent with the predictions of the Schapery equations. An anomalous moisture phenomenon, in the form of a peak in theα m (T)/T andα t (T)/Tcurves for the polyester resin and laminates has been observed. A difference between $$\alpha _{t_1 }$$ and $$\alpha _{t_2 }$$ has been observed for partially cured polyester laminates, which is also perturbated in the presence of water. Both these moisture effects, which are not found in the epoxy specimens, are considered to result from a two-phase polyester matrix and the latter to continued curing below the softening point of the resin. These results have a considerable consequence on the magnitude of the thermal strains which develop in polyester composites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01111973
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  • 7
    Electronic Resource
    Electronic Resource
    Sex pheromone of the avocado pest,Amorbia cuneana (Walsingham) (Lepidoptera: Tortricidae) (1982)
    Springer
    Journal of chemical ecology 8 (1982), S. 255-265 
    Details
    ISSN: 1573-1561
    Keywords: Western avocado leafroller ; Amorbia cuneana ; sex pheromone ; Tortricidae ; (E,E)- and (E,Z)-10,12-tetradecadien-1-ol acetate ; Lepidoptera
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The major volatile components in the extract of the female sex pheromone gland ofAmorbia cuneana consisted of (E,E)- and (E,Z)-10,12-tetradecadien-1-ol acetates. The identification was based on electroantennogram bioassay of gas Chromatographic effluent from sex pheromone gland extract, relative retention times on polar and nonpolar gas chromatographic columns, chemical degradation (ozonolysis, saponification), mass spectrometry, chemical synthetic methods, and field tests. Based on mass spectrometry and retention times by capillary gas chromatography, traces of (E)-10-tetradecen-1-ol acetate and 1-tetradecanol acetate were also present in the extract. Traps baited with a combination of synthetic (E,E)- and (E,Z)-10,12-tetradecadien-1-ol acetates caught more males than did traps baited with females.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984021
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  • 8
    Electronic Resource
    Electronic Resource
    On the structure of some precipitated calcium alumino-sulphate hydrates (1982)
    Springer
    Journal of materials science 17 (1982), S. 3341-3346 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The chemistry of the calcium alumino-sulphate hydrates has been reassessed using the methods developed in a previous paper [10]. Ettringite does not have a constant solubility product. The rise in the ionic activity product of solutions in equilibrium with “ettringite” as a function of pH and sulphate activity is attributed to disordering of the crystal structure. This is due to removal of aluminium from the calcium aluminate hydrate columns which form the framework of the ettringite structure. The columns are terminated by these defects and estimates of the expected column length under various conditions are made. Qualitative explanations of changes in the stability of “ettringite” with respect to calcium aluminate monosulphate hydrate and of the action of certain admixtures on Portland cement are made on this basis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01203504
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  • 9
    Electronic Resource
    Electronic Resource
    Microstructural studies of the hydration products of three tricalcium silicate polymorphs (1983)
    Springer
    Journal of materials science 18 (1983), S. 3686-3694 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Tricalcium silicate (C3S), the major phase of Ordinary Portland Cement (OPC), occurs in several polymorphic forms depending on the amounts and types of impurity ions present. The hydration products of triclinic, trigonal and monoclinic C3S samples have been studied for a comparison with the silicate hydration products of OPC, using TEM and SEM. In the early stages, less than one day, there are distinct differences observed between the products on the surfaces of grains of different crystal structure but later all three appear similar. This suggests a common mechanism of hydration at later times, irrespective of structure, but the influence of the foreign ions in the first few hours is significant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00540741
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  • 10
    Electronic Resource
    Electronic Resource
    The microstructure of the hydration products of tri-calcium aluminate in the presence of gypsum (1983)
    Springer
    Journal of materials science 18 (1983), S. 402-410 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The hydration of tri-calcium aluminate in the presence of gypsum has been examined by electron optical methods as a function of pH and hydration time. The location of the alumino-sulphate phase has been related to the solubility of aluminate ions from the precursive platelet phase. At pH ∼ 11.5 the alumino-sulphate precipitate is crystalline and precipitates from solution. When first formed it is deficient in calcium and sulphate with respect to ettringite. If the deficiency is too great, transformation to calcium aluminate monosulphate hydrate may occur as an intermediate step before the equilibrium phases are obtained. At a higher pH (∼ 12.5) the fibres of alumino-sulphate are smaller and more rounded. Long tubular fibres similar to those seen in portland cement were not observed. This has been explained as a consequence of using pure tricalcium aluminate, rather than alkali-containing material. The information obtained has been used to predict the effect of some inorganic additives on the phases produced during the setting of portland cement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00560628
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