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  • ELECTRONIC SYSTEMS  (3)
  • Countercurrent flow  (1)
  • 1990-1994  (4)
  • 1980-1984
  • 1970-1974
  • 1940-1944
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Transport in porous media 6 (1991), S. 173-182 
    ISSN: 1573-1634
    Schlagwort(e): Countercurrent flow ; capillarity ; relative permeability
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Technik allgemein
    Notizen: Abstract Two phase countercurrent steady-state flow through permeable media in one dimension is discussed. For steady-state countercurrent flow in water wet porous media, a saturation profile is predicted with the water saturation decreasing in the direction that the water phase is flowing. The de la Cruz and Spanos equations predict that the Muskat relative permeability curves for countercurrent flow will be less than the Muskat relative permeability curves for steady-state cocurrent flow. This result has immediate implications regarding the use of external drive techniques to determine relative permeabilities based on the Buckley-Leverett theory and Muskat's equations. These equations and current experimental evidence involving countercurrent flow indicate that Muskat's equations do not adequately describe the multiphase flow of immiscible fluids.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Publikationsdatum: 2019-07-13
    Beschreibung: Adequate suppression of range sidelobes in chirp pulse-compression radar system for spaceborne rain-mapping application demonstrated in operation of aircraft version of system. Radar system operates at center frequency of 13.8 GHz, developed for operation aboard NASA DC-8 aircraft to measure vertical rainfall-rate profiles and rain-cell dimensions. Sidelobes suppressed by at least 55 dB. Technique applied to other frequencies, therefore, useful in other radar systems in which low sidelobes at mid to far range needed.
    Schlagwort(e): ELECTRONIC SYSTEMS
    Materialart: NPO-18515 , NASA Tech Briefs (ISSN 0145-319X); 18; 5; P. 85
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    Unbekannt
    In:  Other Sources
    Publikationsdatum: 2019-07-12
    Beschreibung: Report describes conceptual design of spaceborne radar system mapping precipitation and clouds at mid-latitudes to provide data for research on global weather and climate. Radar operates at two frequencies. Lower (35 GHz) provides vertical profiles of rainfall at rates up to 20 mm/h and enables probing of cirrus clouds. Higher (94 GHz) enables detection and quantitative measurements of clouds of all types and provides rain profiles at rates up to 10 mm/h.
    Schlagwort(e): ELECTRONIC SYSTEMS
    Materialart: NPO-18274 , NASA Tech Briefs (ISSN 0145-319X); 16; 7; P. 44
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    facet.materialart.
    Unbekannt
    In:  Other Sources
    Publikationsdatum: 2019-07-12
    Beschreibung: Two altimeter concepts based on spaceborne synthetic-aperture-radar (SAR) proposed to gather global, uniformly sampled, high-resolution, topographical data on land and ice. Wide swath and high pulse rate of SAR makes possible to acquire spatially contiguous data over large areas in reasonable amount of time, and time needed for altimetric processing of SAR data considerably less than that needed to generate topographical maps from stereoscopic photographs. Radar less vulnerable to cloud cover and other weather conditions than optical techniques.
    Schlagwort(e): ELECTRONIC SYSTEMS
    Materialart: NPO-18254 , NASA Tech Briefs (ISSN 0145-319X); 16; 10; P. 37
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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