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  • 1
    Call number: SR 90.1039(5)
    In: Land Resources Management technical paper
    Type of Medium: Series available for loan
    Pages: 29 S. + 1 Kt.-Beil.
    ISBN: 0643003754
    Series Statement: Land Resources Management technical papers 5
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Call number: SR 90.1039(12)
    In: Land Resources Management technical paper
    Type of Medium: Series available for loan
    Pages: 10 S.
    ISBN: 0643029737
    Series Statement: Land Resources Management technical paper 12
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 3
    Call number: SR 90.1039(8)
    In: Land Resources Management technical paper
    Type of Medium: Series available for loan
    Pages: 25 S.
    ISBN: 0643003975
    Series Statement: Land Resources Management technical paper 8
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 4
    Call number: SR 90.1039(10)
    In: Land Resources Management technical paper
    Type of Medium: Series available for loan
    Pages: 19 S.
    ISBN: 0643004092
    Series Statement: Land Resources Management technical paper 10
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 5
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Description / Table of Contents: Resume On évalue la performance en flexion de poutres renforcées de fibres d'acier de différents types et dans des quantités différentes, suivant des paramètres de résilience et des facteurs de résistance résiduelle définis selon la norme ASTM C1018-89. On a examiné cinq types de fibres d'acier dans des proportions allant de 30 à 150 kg m−3, et deux ordres de résistance de matrice, dans un programme de 117 essais sur des poutres larges de 150 mm et épaisses de 100 mm chargées en trois points sur une portée de 750 mm. On a nettement identifié des différences significatives de performance en liaison avec des variations de paramètres de la matrice et des fibres. La résistance à la fissuration initiale dépend essentiellement des caractéristiques qui gouvernent la résistance de la matrice, et minimalement des paramètres de fibre, tels le type, la dimension et la proportion. Les indices de résilience et les facteurs de résistance résiduelle, en particulier ceux qui correspondent aux flexions les plus fortes, dépendent principalement du type et de la proportion de fibre et, pour des fibres de géométrie similaire, des quantités relatives. Tous dépendent minimalement de la résistance de la matrice.
    Notes: Abstract The flexural performance of steel fibre-reinforced beams with varying amounts and types of fibre is evaluated in terms of toughness parameters and residual strength factors determined in accordance with ASTM Standard C1018-89. Five types of steel fibre in amounts from 30 to 105 kg m−3, and two matrix strength levels, were examined in a program of 117 tests using beams 150 mm wide and 100 mm deep loaded at the third points over a 750 mm span. Significant differences in performance associated with changes in matrix and fibre parameters are clearly identified in this test. First-crack strength depends mainly on characteristics that govern matrix strength and is minimally dependent on fibre parameters such as type, size and amount. Toughness indices and residual strength factors, particularly those corresponding to higher deflections, depend primarily on fibre type, amount and, for geometrically similar fibres, aspect ratio. All are minimally dependent on matrix strength.
    Type of Medium: Electronic Resource
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  • 6
    Publication Date: 2016-03-24
    Description: The multiphase and multicomponent dynamics of the release of light nonaqueous-phase liquid (LNAPL) petroleum hydrocarbons into the subsurface determines the longevity of health and environmental risks. Gasoline is of particular concern, with a wide range of volatilities and solubilities. A Darcy-scale, three-dimensional, multiphase and multicomponent approach simulated the effects of the release depth and duration (20–500 d) on the distribution, partitioning, and fate of gasoline components, highlighting major changes in composition and mass during the initial release period. The simulated release occurred at either the ground surface (shallow) or immediately above the water table (deep). The LNAPL mass losses were directly related to the duration of the release. As much as 20% of the initial LNAPL mass was lost from shallow releases mainly as a result of ongoing volatilization of C4–C6 alkanes in the vadose zone over the release period. This was up to 59% higher than the deep releases, mostly resulting from the greater penetration of the deep release below the water table. Over the longer term, the mole fraction of the components within the LNAPL plume from the shallow releases asymptoted to values observed for a weathered gasoline sampled from the field. The mole fraction of toluene increased from 13 to 17% and short-chain alkanes decreased from 49 to 19%. Interestingly, the particular balance of partitioning processes left the benzene mole fraction approximately constant over the time of release and for an appreciable period beyond. This has important implications for long-term risk in the vapor and water phases.
    Electronic ISSN: 1539-1663
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 7
    Publication Date: 1993-01-01
    Description: The Swiss rutschblock test provides practical information about the stability of snow slabs. However, its use by avalanche workers and ski guides is limited by the time required to perform the test and recommended minimum slope inclination (30°). The present study shows how time requirements can be reduced by cutting rutschblocks with cords or specialized saws — faster techniques that do not appear to affect the results. Comparing the rutschblock results with a stability index developed in Switzerland shows that the recommended minimum slope inclination can be reduced to 20°, provided a second person is present to observe the small block displacements associated with slope inclinations below 30°. Sets of rutschblocks on slopes that vary in inclination by 8° or more are used to determine the effect of slope inclination on rutschblock scores. Also, the frequency distributions of six large sets of repeated tests are used to estimate the precision of one or two tests on a uniform slope.
    Print ISSN: 0022-1430
    Electronic ISSN: 1727-5652
    Topics: Geography , Geosciences
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  • 8
    Publication Date: 1993-01-01
    Description: The Swiss rutschblock test provides practical information about the stability of snow slabs. However, its use by avalanche workers and ski guides is limited by the time required to perform the test and recommended minimum slope inclination (30°). The present study shows how time requirements can be reduced by cutting rutschblocks with cords or specialized saws — faster techniques that do not appear to affect the results. Comparing the rutschblock results with a stability index developed in Switzerland shows that the recommended minimum slope inclination can be reduced to 20°, provided a second person is present to observe the small block displacements associated with slope inclinations below 30°. Sets of rutschblocks on slopes that vary in inclination by 8° or more are used to determine the effect of slope inclination on rutschblock scores. Also, the frequency distributions of six large sets of repeated tests are used to estimate the precision of one or two tests on a uniform slope.
    Print ISSN: 0022-1430
    Electronic ISSN: 1727-5652
    Topics: Geography , Geosciences
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