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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 12 (1974), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: When modelling the long-term behaviour of an aquifer, a resistance-capacitance model controlled by a mini digital computer can be used with advantage. A typical aquifer in eastern England, which is partly confined and partly unconfined is used as an example. The representation of recharge, river flow and pumpage is considered. A period of 100 years is modelled and typical results include the long-term behaviour over a number of years and the short-term response over a few days.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Sap flow in the stems of two cut saplings each of Eucalyptus maculata (a canopy eucalypt forest tree), Doryphora sassafras and Ceratopetalum apetalum (both canopy rainforest trees of south-eastern coastal Australia) was measured by the heat pulse velocity technique and compared with water uptake from a potometer. Scanning electron micrographs of wounding caused by implantation of temperature sensor and heater probes into the sapwood showed that wounding was similar in rainforest and eucalypt species and was elliptical in shape. A circular wound has been implicitly assumed in previous studies. Accurate measurements of sapling water use were obtained using the smaller transverse wound dimension rather than the larger longitudinal dimension because maximum disruption of sap flow through the xylem vessels occurred in the transverse plane. Accurate measurements of sap flux were obtained above a minimum threshold sap velocity. These velocities were 15·7,10·9 and 9·4 cm h−1 for E. maculata, C. apetalum and D. sassafras, respectively. Below the threshold sap velocity, however, sap flow could not be accurately calculated from measurements of heat pulse velocity. The minimum threshold sap velocity appeared to be determined by probe construction and xylem anatomy. Despite the elliptical wounding and inaccurate measurement of sap flow below the threshold sap velocity, total sap flow over the experimental period for two saplings of each species was within 7% of water use measured by the potometer.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Materials and structures 3 (1970), S. 81-84 
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Description / Table of Contents: Summary Conventional creep and crushing tests are usually concerned with the effects of loadings which are applied during relatively short periods of a few minutes. However, gradual applications of the loading, especially during the initial stages, can produce increases in the ultimate strength of the concrete due to a form of solid body compaction which can the take place. The paper describes the increases in strength which have been obtained with mortars and concretes made with Thames Valley aggregates.
    Notes: Résumé Les essais traditionnels de fluage et d'écrasement sont ordinairement liés aux effects de charge de durée relativement courte (quelques minutes). Mais des charges graduellement appliquées, en particulier dans la première période de l'essai, peuvent déterminer un accroissement de la résistance du béton dû en quelque sorte à un compactage du matériau produit par la charge. Cet article rend compte des augmentations de résistance qu'on a ainsi obtenues pour des mortiers et des bétons confectionnés avec des agrégats de la vallée de la Tamise.
    Type of Medium: Electronic Resource
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