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  • Diplectrona modesta  (1)
  • Polymer and Materials Science  (1)
  • tetrabutylammonium tetrabutylaluminate  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of solution chemistry 3 (1974), S. 83-89 
    ISSN: 1572-8927
    Keywords: Conductance ; sodium tetrabutylaluminate ; tetrabutylammonium tetrabutylaluminate ; tetrahydrofuran ; benzene ; ion pairs ; ion aggregates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Conductance measurements are reported for NaAlBu 4 and Bu 4 NAlBu 4 in benzene and in tetrahydrofuran (THF) from a concentration of approximately 5×10−3 M to the fused state for each salt. This is the first reported study where a comparison of a salt with a small cation is made with one having a large cation in a noncomplexing solvent (benzene) and a complexing solvent (THF). The similarity in conductance behavior in THF and the differences in benzene are considered in terms of ion-ion and ion-solvent interactions.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-5117
    Keywords: Diplectrona modesta ; Trichoptera ; Hydropsychidae ; intermittent stream ; desiccation survival
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Larvae of the caddisfly, Diplectrona modesta (Hydropsychidae), were found to be permanent inhabitants of a small, intermittent, headwater stream in southern Ontario. They survived desiccation for at least four weeks in summer. A laboratory experiment gave a mean survivorship of 50% after 30 days without water in stream gravel and stones after the larvae had been permitted to construct their shelters. Survivors were those that constructed their tubes deep in the substrate.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wird das Bewitterungsverhalten von Blei/Barium/Cadmium-bzw. Barium/Cadmium-stabilisierten Profilen mit neuentwickelten, schwermetallfreien Profilen, sogenannten HMF Profilen verglichen.Die Bewitterungsprüfung erfolgte in Freien, im Xenotest 450, QUV(A), und QUV(B). Verfolgt wurden die farbmetrischen Werte (ΔE, ΔL, ΔA, ΔB) und der Glanzverlust in Abhängigkeit von der Bewitterungsdauer. wahrend im QUV(B) fur die Praxis unbrauchbare Ergebnisse erhalten wurden, korrelieren die QUV(A) Gesamtfarbdifferenzergebnisse sehr gut mit den Freibewitterungsergebnissen. Die HMF stabilisierten Profile sind im Oberflächenangriff den Standard Blei/Barium/Cadmium-Profilen gleichwertig, wenn nicht überlegen. In der Farbmetrik verhalten sich die neuentwickelten HMF Profile gleichwertig den Blei/Barium/Cadmium Standardprofilen.
    Notes: The weathering behaviour of lead/barium/cadmium-respectively barium/cadmium-stabilized profiles has been compared with new developed profiles which are free from heavy metals, the so-called HMF profiles.The weathering tests have been made out doors, in Xenotest 450, QUV(A), and QUV(B). The colourmetric values (ΔE, ΔL, ΔA, ΔB) and the loss of brightness were measured in dependence of weathering time. The results of QUV(A) measurements were not suitable for practical application, but the findings of the total colour difference of QUV (A) measurements correlate very well with the results of out door weathering. With respect to the surface attack HMF-stabilized profiles are equivalent to the lead/barium/cadmium standard profiles or even superior. The colourmetric behaviour of the new developed HMF profiles is equivalent to the lead/barium/cadmium standard profiles.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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