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  • EARTH RESOURCES AND REMOTE SENSING  (164)
  • Physics  (54)
  • Aircraft Stability and Control
  • FLUID MECHANICS AND HEAT TRANSFER
  • GENERAL
  • 1980-1984  (250)
  • 1955-1959
  • 1981  (250)
Collection
Keywords
Publisher
Years
  • 1980-1984  (250)
  • 1955-1959
Year
  • 1
    Electronic Resource
    Electronic Resource
    Effect of monomer functional groups on the composition of some three component random phenolic copolymers (1981)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 19 (1981), S. 3005-3012 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Some three-component random phenolic copolymers were prepared from three typical phenolic monomers; for example, p-chlorophenol, p-aminophenol, and p-cresol. Several samples of the copolymer were prepared by changing the feed composition and the composition of the copolymers was established by estimating —NH2 and —OH groups by electrometric titration techniques in nonaqueous media. Halogen was estimated by Volhard's method. The average degree of polymerization (DP) of the copolymers was calculated from the features of the electrometric titration curves, and the effects of monomer functional groups on the composition of the copolymers were interpreted in terms of the electron-donating and electron-attracting nature of the substituents present in the monomers.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1981.170191132
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Synergistic relationships among remote-sensing and geophysical media: Geological and hydrological applications (1981)
    In:  Other Sources
    Details
    Publication Date: 2016-03-09
    Description: Skylab photographs, side-looking radar imagery, published soil maps, topographic maps, conventional aerial photography as well as LANDSAT imagery under wet and dry changes for several years were analyzed over selected areas in Minnesota to test their usefulness in detecting near-surface ground water. Results show that optical density read from LANDSAT data is not a reliable discriminator of depth to shallow ground water when one band of one scene is used alone, and is little improved when several bands of several scenes are used synergistically. The method is enhanced if information from soil maps is included in the analysis, especially for discriminating boggy ground from better drained areas. It appears, however, that in areas where soil maps and good topographic maps already exist, the depth to ground water can be predicted from those media as well as (if not better than) it can be predicted from remote imagery. The LANDSAT method used demonstrated no capability for recognizing deeper categories of ground water.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: A Study of Minn. Land and Water Resources Using Remote Sensing, Vol. 14; 29 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Analysis of landfills with historic airphotos (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An investigation is conducted regarding the value of existing aerial photographs for waste management, including landfill monitoring. The value of historic aerial photographs for documenting landfill boundaries is shown in a graph in which the expansion of an active landfill is traced over a 40-year period. Historic aerial photographs can also be analyzed to obtain general or detailed land-use and land-cover information. In addition, the photographs provide information regarding other elements of the physical environment, including geology, soils, and surface and subsurface drainage. The value of historic photos is discussed, taking into account applications for inventory, assessing contamination/health hazards, planning corrective measures, planning waste collection and facilities, developing inactive landfills, and research concerning improved land-filling operations.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Photogrammetric Engineering and Remote Sensing; 47; Sept
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Interplanetary magnetic clouds at 1 AU (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Magnetic clouds are defined as regions with a radial dimension approximately 0.25 AU (at 1 AU) in which the magnetic field strength is high and the magnetic field direction changes appreciably by means of rotation of one component of B nearly parallel to a plane. The magnetic field geometry in such a magnetic cloud is consistent with that of a magnetic loop, but it cannot be determined uniquely. Forty-five clouds were identified in interplanetary data obtained near Earth between 1967 and 1978; at least one cloud passed the Earth every three months. Three classes of clouds were identified, corresponding to the association of a cloud with a shock, a stream interface, or a CME. There are approximately equal numbers of clouds in each class, and the three types of clouds might be different manifestations of a coronal transient. The magnetic pressure inside the clouds is higher than the ion pressure and the sum is higher than the pressure of the material outside of the cloud.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-82114
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Remote sensing for forest applications in New York: Two case studies (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Under-utilized forest resources in the Northeast can supply fiber to new markets. Information on forest resources, however, is often too aggregated to estimate available woody material with sufficient detail for planning specific projects. Over the past year, staff of Cornell University's Remote Sensing Program, under a grant from NASA, assisted New York State agency personnel by assessing available woody material for two potential development projects, a wood-fired power plant and a particle board manufacturing plant. These feasibility studies are reviewed, illustrating how information derived from high-altitude aircraft photographs, LANDSAT imagery, and available supporting data were integrated to arrive at estimates of woody material.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA. Goddard Space Flight Center 2nd Eastern Reg. Remote Sensing Appl. Conf.; p 73-80
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Irrigated lands assessment for water management: Technique test (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A procedure for estimating irrigated land using full frame LANDSAT imagery was demonstrated. Relatively inexpensive interpretation of multidate LANDSAT photographic enlargements was used to produce a map of irrigated land in California. The LANDSAT and ground maps were then linked by regression equations to enable precise estimation of irrigated land area by county, basin, and statewide. Land irrigated at least once in California in 1979 was estimated to be 9.86 million acres, with an expected error of less than 1.75% at the 99% level of confidence. To achieve the same level of error with a ground-only sample would have required 3 to 5 times as many ground sample units statewide. A procedure for relatively inexpensive computer classification of LANDSAT digital data to irrigated land categories was also developed. This procedure is based on ratios of MSS band 7 and 5, and gave good results for several counties in the Central Valley.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E83-10154 , NASA-CR-166370 , NAS 1.26:166370
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Elevation of a cane-growing area of the state of Sao Paulo using LANDSAT data (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Images at a scale of 1:250.000 were visually interpreted for identification and area estimates of sugar cane plantations in Sao Paulo. The basic criteria for crop identification were the spectral characteristics of channels 5 and 7 and their temporal variations observed from different LANDSAT passes. Using this technique, it was possible to map the sugar cane areas as well as the sugar cane already harvested. An area of 801,950 hectares was estimated within the study area. The confidence interval of correct classification ranged from 87.11% to 94.71%.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10077 , NASA-CR-168398 , NAS 1.26:168399 , INPE-2199-RPE/007
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Simulated response of a multispectral scanner over wheat as a function of wavelength and view/illumination direction (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The reflectance response with view angle of wheat, was analyzed. The analyses, which assumes there are no atmospheric effects, and otherwise simulates the response of a multispectral scanner, is based upon spectra taken continuously in wavelength from 0.45 to 2.4 micrometers at more than 1200 view/illumination directions using an Exotech model 20C spectra radiometer. Data were acquired six meters above four wheat canopies, each at a different growth stage. The analysis shows that the canopy reflective response is a pronounced function of illumination angle, scanner view angle and wavelength. The variation is greater at low solar elevations compared to high solar elevations.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10144 , NASA-CR-167505 , NAS 1.26:167505 , SR-P1-04202 , LARS-071580
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Report of activities of the advanced coal extraction systems definition project, 1979 - 1980 (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: During this period effort was devoted to: formulation of system performance goals in the areas of production cost, miner safety, miner health, environmental impact, and coal conservation, survey and in depth assessment of promising technology, and characterization of potential resource targets. Primary system performance goals are to achieve a return on incremental investment of 150% of the value required for a low risk capital improvement project and to reduce deaths and disability injuries per million man-hour by 50%. Although these performance goals were developed to be immediately applicable to the Central Appalachian coal resources, they were also designed to be readily adaptable to other coals by appending a geological description of the new resource. The work done on technology assessment was concerned with the performance of the slurry haulage system.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-164852 , JPL-PUB-81-69 , DOE/ET-12548/7
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Wetland mapping from digitized aerial photography (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Computer assisted interpretation of small scale aerial imagery was found to be a cost effective and accurate method of mapping complex vegetation patterns if high resolution information is desired. This type of technique is suited for problems such as monitoring changes in species composition due to environmental factors and is a feasible method of monitoring and mapping large areas of wetlands. The technique has the added advantage of being in a computer compatible form which can be transformed into any georeference system of interest.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-164199
    Format: application/pdf
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