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  • 1985-1989  (16)
  • 1986  (16)
  • 11
    Electronic Resource
    Electronic Resource
    Adsorption of mercury compounds by tropical soils (1986)
    Springer
    Water, air & soil pollution 27 (1986), S. 19-27 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Mercury adsorption of HgCl2 and 2-methoxyethylmercury chloride (Aretan) (100 mg Hg L−1) was measured for three soil profiles from Morogoro, Arusha, and Dar es Salaam in Tanzania. The adsorption was investigated for the physical, chemical, and mineralogical properties of the soils. All soil samples showed greater capacity for adsorption of Aretan than for HgCl2. In the Morogoro profile Hg adsorption decreased with depth but in the other two soils, the minimum adsorption occurred in the third horizon and increased both upwards and downwards. In the Morogoro profile, Aretan adsorption correlated well with pH. Adsorption of both Aretan and HgCl2 correlated well with the distribution of organic C and with the cation exchange capacity of the soils. In the Arusha and Dar es Salaam profiles Hg adsorption was not significantly correlated with any of the soil properties tested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00464766
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  • 12
    Electronic Resource
    Electronic Resource
    Vanadium-cyclohexanone-initiated graft copolymerization of methyl methacrylate onto jute fibers (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 31 (1986), S. 1763-1769 
    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: Graft copolymerization of methyl methacrylate (MMA) was carried out on jute fibers using a V5+ -cyclohexanone redox initiator system. The effect of the concentration of acid, monomer, and V5+ on graft yield have been studied. In order to obtain optimum conditions of grafting, the effects of temperature, acid, reaction medium, solvent, and some inorganic salts on graft yield have been investigated. The most remarkable features of the investigation include the proposition of a mechanism and derivation of rate expression for the grafting process. More than 100% grafting could be achieved with the present system.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1986.070310621
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  • 13
    Electronic Resource
    Electronic Resource
    Mercury pollution of effluent, air, and soil near a battery factory in Tanzania (1986)
    Springer
    Water, air & soil pollution 27 (1986), S. 141-146 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Effluent, air, and soil samples near a battery factory in Dar es Salaam, Tanzania, where HgCl2 is used to prevent mold growth, were collected to explore the potential for pollution of the environment from industrial discharge of Hg. Flameless atomic absorption spectrophotometry was used for Hg determinations. The concentration of Hg in the effluent ranged from 〈0.2 to 5.2 mg L−1 and the Hg concentration varied greatly within and among sampling days, showing different peaks. Air contained a mean of 4.0 μg m−3 with little variation within and between sampling days. Soils near the factory contained high Hg levels, from 6.7 to 472 mg kg−1 in the immediate vicinity, the highest level being associated with disposal of solid waste (defective batteries). Downwind the concentration of Hg decreased with increasing distance from the factory resulting in a soil concentration of 1.0 mg Hg kg−1 about 2 km away. Upwind the Hg concentration decreased drastically within a distance of 100 to 200 m.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00464776
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  • 14
    Electronic Resource
    Electronic Resource
    Plastic zones in an orthotropic plate of finite width containing a Griffith crack (1986)
    Springer
    International journal of fracture 75 (1986), S. 307-322 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The problem of an orthotropic infinite plate of finite width containing a centrally located stressed Griffith crack is considered. The crack is located perpendicular to the edges of the orthotropic plate. The crack tips are fully yielded and in the inelastic zones the material carries only constant normal stresses equal to the yield stress. Dugdale's model is employed to find the effects of the material anisotropy on the size of the plastic zones around the crack tips. Graphical results showing the effects of anisotropy on the length of the plastic zone are also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00019611
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    Paper (German National Licenses)
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  • 15
    Electronic Resource
    Electronic Resource
    A Reissner-Sagoci problem for a non-homogeneous elastic solid (1986)
    Springer
    Journal of elasticity 16 (1986), S. 383-391 
    Details
    ISSN: 1573-2681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The present paper examines the elastostatic problem related to the axisymmetric rotation of a rigid circular punch which is bonded to the surface of a non-homogeneous isotropic elastic halfspace. The non-homogeneity corresponds to an axial variation of the linear elastic shear modulus according to the exponential form % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaam4raiaacI% cacaWG6bGaaiykaiabg2da9iaadEeadaWgaaWcbaGaaGymaaqabaGc% cqGHRaWkcaWGhbWaaSbaaSqaaiaaikdaaeqaaOGaaeiiaiaabwgada% ahaaWcbeqaaiaab2cacqaH+oaEcaqG6baaaaaa!439C!\[G(z) = G_1 + G_2 {\text{ e}}^{{\text{ - }}\xi {\text{z}}} \]. A Hankel transform development of the governing equations yields a set of dual integral equations which in turn can be reduced to a Fredholm integral equation of the second kind. A numerical evaluation of this integral equation yields results which can be used to estimate the torque-twist relationship for the circular punch.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00041763
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  • 16
    Electronic Resource
    Electronic Resource
    Retardation of V5+-thiourea initiated polymerization of acrylonitrile by phenol (1986)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 142 (1986), S. 69-78 
    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: Kinetik und Mechanismus der Verzögerung der Polymerisation von Acrylnitril mit einem V5+-Thioharnstoffkomplex als Initiator durch Phenol wurden im Temperaturbereich von 40-50°C untersucht. Die Auswirkung von Verzögerungsagens (Phenol), Metallion, Monomerem, Schwefelsäure, einigen anorganischen Salzen und organischen Lösungsmitteln wurden ebenfalls untersucht. Die bemerkenswerteste Beobachtung in der vorliegenden Untersuchung ist die Tatsache, daß bei der Auftragung von [M]/Rp gegen 1/[M] ein positiver Achsenabschnitt erhalten wird. Ein Reaktionsmechanismus und eine passende Geschwindigkeitsgleichung wurde vorgeschlagen und anhand der experimentellen Ergbnisse erläutert.
    Notes: Studies have been made on the kinetics and mechanism of the retardation of V5+-thiourea initiated polymerization of acrylonitrile by phenol in the temperature range 40 - 50°C. The effects of retarder (phenol), metal ion, monomer, sulphuric acid, some inorganic salts, and organic solvents have also been studied. The most remarkable observation in the present investigation is the positive intercept obtained from the plot of [M]/Rp vs. 1/[M]. A reaction mechanism has been suggested and a suitable rate expression has been proposed and explained in the light of experimental findings.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1986.051420106
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    Paper (German National Licenses)
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