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  • 1
    Electronic Resource
    Electronic Resource
    A viral aetiology for the annual spring epizootics of Atlantic menhaden Brevoortia tyrannus (Latrobe) in Chesapeake Bay (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 3 (1980), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Abstract. Virus was isolated from the brain and pancreatic tissues of Atlantic menhaden with ‘spinning’ disease. The biological, physical and chemical properties of the isolate were similar to those of infectious pancreatic necrosis virus. Inoculation of the virus into healthy menhaden resulted in the characteristic signs and mortality associated with the natural disease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.1980.tb00423.x
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Thomas M. Bushnell (1976)
    Soil Science Society of America
    Details
    Publication Date: 1976-01-01
    Electronic ISSN: 2163-2812
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Soil Science Society of America
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    PAPER CURRENT
  • 3
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    Computer simulations of cosmic-ray diffusion near supernova remnant shock waves (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A plasma simulation model was used to study the resonant interactions between streaming cosmic-ray ions and a self-consistent spectrum of Alfven waves, such as might exist in the interstellar medium upstream of a supernova remnant shock wave. The computational model is a hybrid one, in which the background interstellar medium is an MHD fluid and the cosmic-rays are discrete kinetic particles. The particle sources for the electromagnetic fields are obtained by averaging over the fast cyclotron motions. When the perturbed magnetic field is larger than 10 percent of the background field, the macro- and microphysics are no longer correctly predicted by quasi-linear theory. The particles are trapped by the waves and show sharp jumps in their pitch-angles relative to the background magnetic field, and the effective ninety-degree scattering time for diffusion parallel to the background magnetic field is reduced to between 5 and 30 cyclotron periods. Simulation results suggest that Type 1 supernova remnants may be the principal sites of cosmic ray acceleration.
    Keywords: PLASMA PHYSICS
    Type: ESA, Proceedings of an International School and Workshop on Plasma Astrophysics, Volume 1; p 45-5
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Comparing soil boundaries delineated by digital analysis of multispectral scanner data from high and low spatial resolution systems (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The author has identified the following significant results. Computer-aided analysis techniques used with aircraft MSS data showed that the spatial resolution was sufficient to recognize each soil mapping unit of the test site. Some difficulties occurred where different soil series were intricately mixed, and this mixture showed as a separate spectral mapping unit, or where the difference between two soils depended on the depth of silty surface material. Analysis of LANDSAT data with computer-aided techniques showed that it was not possible to find spectrally homogeneous soil features of the seven soil series on the 40 ha test site on the digital display or on a picture print map. Cluster techniques could be used on an extended test area to group spectrally similar data points into cluster classes.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E78-10017 , NASA-CR-151530 , LARS-PUBL-082477
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Mapping soil features from multispectral scanner data (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: In being able to identify quickly gross variations in soil features, the computer-aided classification of multispectral scanner data can be an effective aid to soil surveying. Variations in soil tone are easily seen as well as variations in features related to soil tone, e.g., drainage patterns and organic matter content. Changes in surface texture also affect the reflectance properties of soils. Inasmuch as conventional soil classes are based on both surface and subsurface soil characteristics, the technique described here can be expected only to augment and not replace traditional soil mapping.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Photogrammetric Engineering; 40; Dec. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Application of multispectral remote sensing to soil survey research in Indiana (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Computer-implemented mappings based on spectral properties of bare soil surfaces were compared with mapping units of interest to soil surveyors. Some soil types could be differentiated by their spectral properties. In other cases, soils with similar surface colors and textures could not be distinguished spectrally. The spectral maps seemed useful for delineating boundaries between soils in many cases.
    Keywords: GEOPHYSICS
    Type: NASA-CR-130033 , LARS-PRINT-110972
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Mapping soil types from multispectral scanner data. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Multispectral remote sensing and computer-implemented pattern recognition techniques were used for automatic ?mapping' of soil types. This approach involves subjective selection of a set of reference samples from a gray-level display of spectral variations which was generated by a computer. Each resolution element is then classified using a maximum likelihood ratio. Output is a computer printout on which the researcher assigns a different symbol to each class. Four soil test areas in Indiana were experimentally examined using this approach, and partially successful results were obtained.
    Keywords: GEOPHYSICS
    Type: International Symposium on Remote Sensing of Environment, 7th, University of Michigan; May 17, 1971 - May 21, 1971; Ann Arbor, MI
    Format: text
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    NASA TECHNICAL REPORTS
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