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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Micron And Microscopica Acta 20 (1989), S. 207-215 
    ISSN: 0739-6260
    Keywords: Ranvier's nodes ; adenosine triphosphatase ; histochemistry ; membranes ; ultrastructure
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2019-07-13
    Description: Several passive and active microwave, as well as passive optical remote sensors, applicable to the monitoring of oil spills and waste discharges at sea, are considered. The discussed types of measurements relate to: (1) spatial distribution and properties of the pollutant, and (2) oceanic parameters needed to predict the movement of the pollutants and their impact upon land. The sensors, operating from satellite platforms at 700-900 km altitudes, are found to be useful in mapping the spread of oil in major oil spills and in addition, can be effective in producing wind and ocean parameters as inputs to oil trajectory and dispersion models. These capabilities can be used in countermeasures.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA PAPER 80-1927 , Sensor Systems for the 80''s Conference; Dec 02, 1980 - Dec 04, 1980; Colorado Springs, CO
    Format: text
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  • 3
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    In:  Other Sources
    Publication Date: 2019-07-13
    Keywords: COMMUNICATIONS
    Type: Conference on Earth Resources Observation and Information Analysis Systems; Mar 26, 1973 - Mar 28, 1973; Tullahoma, TN
    Format: text
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  • 4
    Publication Date: 2019-07-13
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Conference on Earth Resources Observation and Information Analysis Systems; Mar 26, 1973 - Mar 28, 1973; Tullahoma, TN
    Format: text
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  • 5
    Publication Date: 2019-07-13
    Description: The LEOSAR (low-earth-orbit synthetic aperture radar) can map around the earth, while the GEOSAR (geosynchronous synthetic aperture radar) can map a large global area bounded in both longitudinal and latitudinal ranges. This paper presents the mapping capabilities and power requirements of both LEOSAR and GEOSAR. For a low-earth-orbit SAR, images of swath widths of the order of 700 km are possible with 100-m resolution and 300 watts of average transmitter power at 9375 MHz. From a SAR in a 50-deg inclined geosynchronous circular orbit, the contiguous United States can be imaged in about 6.4 hours with 100-m resolution, 345 watts of average transmitter power, and a data rate of 6 megabits/sec at 2450 MHz.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: In: International Symposium on Remote Sensing of Environment; May 11, 1981 - May 15, 1981; Ann Arbor, MI
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  • 6
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    In:  Other Sources
    Publication Date: 2019-07-13
    Description: The paper demonstrates the feasibility of a bistatic synthetic aperture radar (BISAR) utilizing two satellites. The proposed BISAR assumes that the direction of the two narrow antenna beams are programmed to coincide over the desired area to be imaged. Functionally, the transmitter and receiver portions can be interchanged between the two satellites. The two satellites may be in one orbit plane or two different orbits such as geosynchronous and low-earth orbits. The pulse repetition frequency and imaging geometry are constrained by contours of isodops and isodels. With two images of the same area viewed from different angles, it is possible in principle to derive three-dimensional stereo images. Applications of BISAR include topography, water resource management, and soil moisture determination.. Advantages of BISAR over a monostatic SAR are mentioned, including lower transmitter power and greater ranges in incidence angle and coverage.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: EASCON ''78; Electronics and Aerospace Systems Convention; Sep 25, 1978 - Sep 27, 1978; Arlington, VA
    Format: text
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  • 7
    Publication Date: 2019-06-27
    Description: The Seasat-A satellite scatterometer is a microwave sensor designed to provide a capability for mapping the global ocean surface wind speed and direction. Four fan beams whose major axes are oriented at + or - 45 deg and + or - 135 deg to the flight vector cover a swath width of 1900 km, but a central region remains that is inadequately mapped. In this paper, two additional fan beams for a future scatterometer are suggested which provide more complete coverage of the central region.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: IEEE Journal of Oceanic Engineering; OE-3; July 197
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  • 8
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    In:  CASI
    Publication Date: 2019-06-27
    Description: Radar images of the earth were taken with a synthetic aperture radar (SAR) from geosynchronous orbital ranges by utilizing satellite motion relative to a geostationary position. A suitable satellite motion was obtained by having an orbit plane inclined relative to the equatorial plane and by having an eccentric orbit. Potential applications of these SAR images are topography, water resource management and soil moisture determination. Preliminary calculations show that the United States can be mapped with 100 m resolution cells in about 4 hours. With the use of microwave signals the mapping can be performed day or night, through clouds and during adverse weather.
    Keywords: COMMUNICATIONS AND RADAR
    Type: New Mexico State Univ. Proc. of the 1978 Syn. Aperture Radar Technol. Conf.; 5 p
    Format: application/pdf
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  • 9
    Publication Date: 2019-06-28
    Description: Images of earth can be produced with an assumed synthetic aperture radar (SAR) on a satellite platform undergoing a nutating relative motion from geosynchronous altitude. From a 50 deg inclined circular orbit, the contiguous United States can be imaged in about 3 h of segmented operation at 100-m resolution with 4-azimuth-look averaging. The 2450-MHz transmitter radiates 1312 W of average power from a steerable 15-m-diam antenna. The SAR can image daily an area bounded longitudinally and latitudinally.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: (ISSN 0196-2892)
    Format: text
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  • 10
    Publication Date: 2019-06-28
    Description: A satellite borne synthetic aperture radar can image a wide swath in the order of 700 km with one-look 100-m resolution. If the design meets the ambiguity constraints at the far edge of the swath, the maximum swath width is independent of both radar wavelength and shape of the physical antenna aperture. The antenna pattern can be a pencil beam scanned in the elevation plane, or a fan beam formed by a long antenna. The scanning pencil beam antenna may be a phased array or multiple-feed reflector which may be more practical than a long antenna to image a wide swath. Design performance trade computations are presented involving resolution, swath width, antenna area, average transmitter power and digital data rate.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: IEEE Transactions on Geoscience and Remote Sensing; GE-19; Apr. 198
    Format: text
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