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  • Chemistry  (3)
  • stormwater  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Stormwater impact to the freshwater Savannas Preserve marsh, Florida, USA (1998)
    Springer
    Hydrobiologia 379 (1998), S. 111-122 
    Details
    ISSN: 1573-5117
    Keywords: macroinvertebrates ; stormwater ; phosphorus ; multivariate statistics ; marsh ecology ; biological assessment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This study evaluated the water quality effects of both untreated and state-of-the-art treated stormwater on a Florida freshwater oligotrophic marsh macroinvertebrate assemblage during 1995–96. Twenty sampling sites were distributed throughout the length of the Savannas State Preserve freshwater marsh. Sites received runoff from natural upland areas or one of two major subdivisions that utilize the Preserve for stormwater disposal. Multivariate and other statistical tests were used to elucidate differences in the macroinvertebrate assemblage, and to identify specific water quality variables that correlated with these differences. Areas of the Preserve that received both treated and untreated stormwater were shown to possess macroinvertebrate assemblages that differed from those of natural areas, with the greatest differences being observed in association with untreated stormwater. Areas that received untreated stormwater had higher levels of pH, phosphorus, and hardness, and lower levels of dissolved oxygen; while only elevated pH and hardness were documented in areas that received treated stormwater. Several species were identified as important factors driving observed macroinvertebrate differences, and the abundances of these species were related to their environmental requirements. Several violations of State water quality and aquatic life rules were documented. On the basis of these results, a multi-agency task force has been convened to address the stormwater pollution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003413228671
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  • 2
    Electronic Resource
    Electronic Resource
    Direct substitution of polyolefins (1968)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 4 (1968), S. 81-90 
    Details
    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: Die Umsetzung von Äthylen-Propylen-Copolymeren mit Spendern von Carboniumionen, wie zum Beispiel Isopropylbenzol, führt in Gegenwart von sauren Katalysatoren zur Einführung von aromatischen und hydroxylischen Gruppen in das Polymerengerüst. Gasfömige Hauptprodukte sind Isobutan und Propan. Die Reaktion ist von Kettenspaltung begleitet.
    Notes: Reaction of solutions of ethylene-propylene copolymer with carbonium ion sources, such as isopropylbenzene, in the presence of acid catalysts leads to the introduction of the aromatic and hydroxylic moieties onto the copolymer backbone. Major gaseous products are isobutane and propane. Chain scission accompanies the reaction.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1968.050040104
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  • 3
    Electronic Resource
    Electronic Resource
    Evaluation of recycled PP/rubber/talc hybrids (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 58 (1995), S. 527-535 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Mechanical properties of recycled PP/rubber/filler systems were studied and mechanisms were discussed on the basis of molar mass and molar mass distribution, morphologies, and thermal behavior. Characteristics of recycled PP/rubber/filler depend on degradation of PP and additional components. Recycling processes decreased impact strength, but it seemed not to affect tensile properties significantly. Aging with UV and moisture affected mechanical properties by some degree of PP chain scissions and ethylene chain crosslinking in EP rubber. Inorganic filler acted as a crack center and accelerated aging degradation. Paint decreased mechanical properties significantly by introducing stress concentrations. Recycle processing decreased the molar mass and increased the molar mass distribution of PP. Aging with UV decreased crystallization temperature and increased crystallization half-time by decreasing nucleation. © 1995 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1995.070580306
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  • 4
    Electronic Resource
    Electronic Resource
    Darstellung von Metall-Schwefel-Clustern durch einfache Reaktion von Metallsalzen mit H2S: R2(NH4)[Cu3S12], R2[Cu4S12] · CH3CN, R2[Cu4S12,8], R2[Fe2S2(S5)2], R2[Fe4S4Br4], R2[Fe4S4Br2Cl2], R2[Fe4S4Cl4], R2[Fe2S2Cl4] (R = PPh4) und [Fe(DMF)6][Fe2S2Cl4]Professor Friedo Huber zum 60. Geburtstage am 4. Juni 1989 gewidmet (1989)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 570 (1989), S. 7-36 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation of Metal-Sulfur-Clusters by Simple Reaction of Metal-Salts with H2S: R2(NH4) [Cu3S12], R2[Cu4S12] · CH3CN, R2[Cu4S12,8], R2[Fe2S2(S5)2], R2[Fe4S4Br4], R2[Fe4S4Br2Cl2], R2[Fe4S4Cl4], R2[Fe2S2Cl4] (R = PPh4) and [Fe(DMF)6][Fe2S2Cl4]Simple preparation methods for metal sulfur clusters from simple metal salts and H2S in solution are reported (for the systems Cum+/H2S and Fen+/H2S). The compounds R2(NH4)[Cu3S12], R2[Cu4S12] · CH3CN, R2[Cu4S12,8], R2[Fe2S2(S5)2], R2[Fe4S4Br4], R2[Fe4S4Br2Cl2], R2[Fe4S4Cl4], R2[Fe2S2Cl4] (R = PPh4) and [Fe(DMF)6][Fe2S2Cl4] were characterized spectroscopically (IR, Raman, Fe-Mössbauer) and by complete crystal structure analyses (except R2[Fe2S2(S5)2] and R2[Fe2S2Cl4]).For structural data see Inhaltsübersicht.
    Notes: Es wird über eine einfache Darstellungsmöglichkeit von Metall-Schwefel-Clustern aus einfachen Metall-Salzen und H2S in Lösung berichtet und zwar für die Systeme Cum+/H2S und Fen+/H2S. Die Verbindungen R2(NH4)[Cu3S12], R2[Cu4S12] · CH3CN, R2[Cu4S12,8], R2[Fe2S2(S5)2], R2[Fe4S4Br4], R2[Fe4S4Br2Cl2], R2[Fe4S4Cl4], R2[Fe2S2Cl4] (R = PPh4) und [Fe(DMF)6][Fe2S2Cl4] wurden spektroskopisch (IR, Raman, Fe-Mößbauer) sowie durch vollständige Kristallstrukturanalyse charakterisiert (mit Ausnahme von R2[Fe2S2(S5)2]).(PPh4)2(NH4)[Cu4S12]: P1, a = 1266,0(5), b = 1 489,6(6), c = 1 493,6(6) pm, α = 74,72(3), β = 86,40(3), γ = 77,52(3)°, V = 2 652,9 · 106 pm3, Z = 2; R = 0,057 für 8377 unabhängige Reflexe (Fo 〉 3,92 σ(Fo)).(PPh4)2(NH4)[Cu4S12] · CH3CN: P1, a = 1 062,2(3), b = 1 336,2(4), c = 2 137,8(6) pm, α = 102,42(2), β = 90,60(2), γ = 110,16(2)°, V = 2 769,8 · 106 pm3, Z = 2; R = 0,076 für 4312 unabhängige Reflexe (Fo 〉 3,92 σ(Fo)).(PPh4)2[Cu4S12,8]: P21/n, a = 1 245,2(8), b = 1 306,9(10), c = 3348,7(22) pm, β = 98,90(5°), V = 5383,9 · 106 pm3, Z = 4; R = 0,094 für 4814 unabhängige Reflexe (Fo 〉 3,92 σ(Fo)).(PPh4)2[Fe4S4Br4]: C2/c, a = 1585,8(6), b = 1440,6(4), c = 2419,7(9) pm, β = 112,74(3)°, V = 5 098,1 · 106 pm3, Z = 4; R = 0,068 für 3 247 unabhängige Reflexe (Fo 〉 3,92 σ(Fo)).(PPh4)2[Fe4S4Br2Cl2]: C2/c, a = 1592,3(3), b = 1432,9(3), c = 2325,0(5) pm, β = 106,43(2)°, V = 5 088,1 · 106 pm3, Z = 4; R = 0,084 für 1982 unabhängige Reflexe (Fo 〉 3,92 σ(Fo)).(PPh4)2[Fe4S4Cl4]: C2/c, a = 1593,9(3), b = 1420,8(2), c = 2316,9(4) pm, β = 106,65(1)°, V = 5026,9 · 106 pm3, Z = 4; R = 0,069 für 3 902 unabhängige Reflexe (Fo 〉 3,92 σ(Fo)).[Fe(DMF)6][Fe2S2Cl4]: P1, a = 923,5(4), b = 941,4(4), c = 1123,9(5) pm, α = 75,29(4), β = 71,17(3), γ = 87,27(4)°, V = 893,9 · 106 pm3, Z = 1; R = 0,067 für 1832 unabhängige Reflexe (Fo 〉 3,92 σ(Fo)).
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19895700102
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