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  • Electronic Resource  (4)
  • 1980-1984  (4)
  • 1970-1974
  • 1983  (4)
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  • Electronic Resource  (4)
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  • 1980-1984  (4)
  • 1970-1974
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  • 1
    Electronic Resource
    Electronic Resource
    Experiments to Assess the Hydraulic Efficiency of Well Screens (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 21 (1983), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: The hydraulic properties of commercial well screens were investigated to determine which screen design features affected head loss. The test program began with laboratory experiments and continued as a field-scale experiment with the installation of a well field in the Thames Valley Gravel Aquifer.The laboratory experiments indicated that, for all practical purposes, the head loss attributable to all of the screens tested was negligible. The experimental head loss, however, did vary from screen to screen, particularly at high intake velocities, and the screens could be ranked on the basis of their hydraulic efficiencies. This efficiency hierarchy is explained tentatively in terms of the screen construction methods and slot geometry. The field experiments showed that the hydraulic performance of all well screens is independent of screen design provided that the open area of the screen is above about 10%. The field experiments also indicated that the development capacity of a screen in a gravel aquifer is not wholly dependent on screen design, but that progressive development does increase the hydraulic efficiency of a well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1983.tb00722.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of a new antiarrhythmic agent, flecainide acetate, on systolic time intervals (1983)
    Springer
    European journal of clinical pharmacology 25 (1983), S. 13-18 
    Details
    ISSN: 1432-1041
    Keywords: flecainide ; antiarrhythmic agent ; systolic time intervals ; heart functions ; conduction delay ; myocardial contractility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary We investigated the effect of flecainide on systolic time intervals in 6 healthy subjects. A randomized, double blind, cross-over study was designed using flecainide (2 mg/kg), propranolol (0.2 mg/kg) or saline. In comparison with placebo, flecainide increased heart rate, diastolic BP, QT-Index, QS2-Index, PEP, and reduced LVET-Index (p〈0.05). It caused a significant increase in PR interval, QRS duration, and PEP/LVET (p〈0.01). Propranolol, compared with placebo, decreased heart rate and systolic BP (p〈0.05). It increased PR interval, PEP, and PEP/LVET ratio (p〈0.05). In comparison with propranolol, flecainide increased heart rate and QRS duration (p〈0.01, p〈0.001 respectively). It increased diastolic BP, PR interval, QS2-Index, PEP, and PEP/LVET ratio, and decreased LVET-Index (p〈0.05). These changes in STI induced by flecainide may be produced by depression of myocardial contractility. Intraventricular conduction delay may be an additional contributing factor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00544007
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Diagenetic processes and the mineralization in the triassic of Central England (1983)
    Springer
    Mineralium deposita 18 (1983), S. 365-377 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Continental red beds are the host rocks of a characteristic style of mineralization which suggests a genetic link between red bed formation and ore formation. Samples of unmineralized and mineralized Triassic sediments from Central England have been studied sedimentologically, petrographically and geochemically with the aim of clarifying this link which may provide valuable guides for exploration. On the basis of sedimentological and petrographic observations it is suggested that these red beds were formed as a result of diagenetic alteration whereby detrital silicates and oxides are progressively dissolved and the iron released is deposited as hematite. A model for mineralization is proposed involving the release of trace metals from detrital minerals during diagenesis, their retention in saline interstitial solutions, migration to suitable sites of precipitation and deposition by reaction with trapped hydrocarbons or reduced sulphur.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00206485
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    First results from the Clark Lake Multifrequency Radioheliograph (1983)
    Springer
    Solar physics 83 (1983), S. 385-389 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We give a brief description of the Clark Lake Multifrequency Radioheliograph which is presently used for solar research in the frequency range 20–125 MHz. We present two-dimensional images of the Sun's corona at several frequencies within this range, obtained with time resolution as good as 1.28 s. The shape of the Sun's outer corona as observed at meter-decameter wavelengths appears to change in time periods as short as a few seconds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00148288
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    Paper (German National Licenses)
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