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  • 1
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    Application of a Moment Method to Heat Transfer in Rarefied Gases (1962)
    American Institute of Physics
    Details
    Publication Date: 1962-01-01
    Print ISSN: 0031-9171
    Topics: Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 2
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    Application of the Monte Carlo Method to Heat Transfer in a Rarefied Gas (1962)
    American Institute of Physics
    Details
    Publication Date: 1962-01-01
    Print ISSN: 0031-9171
    Topics: Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 3
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    New technologies - How to assess environmental effects (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A method is provided for assessing the environmental effects of a room-and-pillar mining system (RP) and a new hydraulic borehole mining system (HBM). Before environmental assessment can begin, each technology is defined in terms of its engineering characteristics at both the conceptual and preliminary design stages. The mining sites are also described in order to identify the significant advantages and constraints for each system. This can be a basic physical and biological survey of the region at the conceptual stage, but a more specific representation of site characteristics is required at the preliminary stage. Assessment of potential environmental effects of each system at the conceptual design is critical to its hardware development and application. A checklist can be used to compare and identify the negative impacts of each method, outlining the resource affected, the type of impact involved, and the exact activity causing that impact. At the preliminary design stage, these impacts should be evaluated as a result of either utilization or alteration. Underground coal mining systems have three major utilization impacts - the total area disturbed, the total water resources withdrawn from other uses, and the overall energy efficiency of the process - and one major alteration impact - the degradation of water quality by sedimentation and acid contamination. A comparison of the RP and HBM systems shows the HBM to be an environmentally less desirable system for the Central Appalachia region.
    Keywords: ENVIRONMENT POLLUTION
    Type: Environmental Science and Technology; 15; Mar. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Overall requirements for an advanced underground coal extraction system (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Underground mining systems suitable for coal seams expoitable in the year 2000 are examined with particular relevance to the resources of Central Appalachia. Requirements for such systems may be summarized as follows: (1) production cost; (2)miner safety; (3) miner health; (4) environmental impact; and (5) coal conservation. No significant trade offs between production cost and other performance indices were found.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-163748 , JPL-PUB-80-39 , DOE/ET-12548/1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Requirements for the conceptual design of advanced underground coal extraction systems (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Conceptual design requirements are presented for underground coal mining systems having substantially improved performance in the areas of production cost and miner safety. Mandatory performance levels are also set for miner health, environmental impact, and coal recovery. In addition to mandatory design goals and constraints, a number of desirable system characteristics are identified which must be assessed in terms of their impact on production cost and their compatibility with other system elements. Although developed for the flat lying, moderately thick seams of Central Appalachia, these requirements are designed to be easily adaptable to other coals.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-169142 , JPL-PUBL-81-70 , NAS 1.26:169142
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    A life-cycle description of underground coal mining (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An initial effort to relate the major technological and economic variables which impact conventional underground coal mining systems, in order to help identify promising areas for advanced mining technology is described. The point of departure is a series of investment analyses published by the United States Bureau of Mines, which provide both the analytical framework and guidance on a choice of variables.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-157346 , JPL-PUB-78-26
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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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
  • 8
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    Resource targets for advanced underground coal extraction systems (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Resource targets appropriate for federal sponsorship of research and development of advanced underground coal mining systems are identified. A comprehensive examination of conventional and unconventional coals with particular attention to exceptionally thin and thick seams, steeply dipping beds, and multiple seam geometry was made. The results indicate that the resource of primary importance is flat lying bituminous coal of moderate thickness, under moderate cover, and located within the lower 48 states. Resources of secondary importance are the flat lying multiple seams and thin seams (especially those in Appalachia). Steeply dipping coals, abandoned pillars, and exceptionally thick western coals may be important in some regions of subregions, but the limited tonnage available places them in a position of tertiary importance.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-169429 , JPL-PUB-82-15 , NAS 1.26:169429 , DOE/ET-12548/14
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Manifold Coal-Slurry Transport System (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Feeding several slurry pipes into main pipeline reduces congestion in coal mines. System based on manifold concept: feeder pipelines from each working entry joined to main pipeline that carries coal slurry out of panel and onto surface. Manifold concept makes coal-slurry haulage much simpler than existing slurry systems.
    Keywords: MACHINERY
    Type: NPO-16471 , NASA Tech Briefs (ISSN 0145-319X); 10; 1; P. 110
    Format: text
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    NASA TECHNICAL REPORTS
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