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  • 1
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    A statistical approach for the integrated analysis of mine induced seismicity and numerical stress estimates, a case study-Part II: evaluation of the relations (2005)
    In:  Int. J. Rock Mech. Min. Sci., Luxembourg, Conseil de l'Europe, vol. 42, no. 1, pp. 73-94, pp. L24314, (ISSN: 1340-4202)
    Details
    Publication Date: 2005
    Keywords: Induced seismicity ; Mining geophysics ; Seismicity ; Statistical investigations ; Modelling ; Rock bursts (see also ERDSTOSS and GEBIRGSSCHLAG) ; IJRM
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    A statistical approach for the integrated analysis of mine-induced seismicity and numerical stress estimates, a case study-Part I: developing the relations (2005)
    In:  Int. J. Rock Mech. Min. Sci., Luxembourg, Conseil de l'Europe, vol. 42, no. 1, pp. 47-72, pp. L24314, (ISSN: 1340-4202)
    Details
    Publication Date: 2005
    Keywords: Induced seismicity ; Mining geophysics ; Seismicity ; Statistical investigations ; Modelling ; Rock bursts (see also ERDSTOSS and GEBIRGSSCHLAG) ; IJRM
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Upper Surface Nacelle Influence on SCAR Aerodynamic Characteristics at Transonic Speeds (1976)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The arrow-wing transport configuration with detached engines located over the wing to produce upper surface exhaust flow effects was tested at angles of attack from -4 deg to 8 deg and jet total-pressure ratios from 1 (Jet off) to approximately 10. Wing tip leading edge flap deflections of -10 deg to 10 deg were tested with the wing-body configuration only (no nacelles). Tests were made with various nacelle chordwise, spanwise, and vertical height locations over the Mach number, angle of attack, and jet total-pressure ratio ranges. Deflecting the wing tip leading edge flap from 0 deg to -10 deg increased maximum lift to drag ratio by 1.0 at subsonic speeds. Installation of upper surface nacelles (no wing/nacelle pylons) increased the wing-body pitching moment at all Mach numbers and decreased the drag of the wing-body configuration at subsonic Mach numbers. Jet exhaust interference effects were negligible.
    Keywords: AERODYNAMICS
    Type: Proc. of the SCAR Conf., Part 1; p 137-154
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Transonic aerodynamic characteristics of a supersonic cruise aircraft research model with the engines suspended above the wing (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The influence of upper-surface nacelle exhaust flow on the aerodynamic characteristics of a supersonic cruise aircraft research configuration was investigated in a 16 foot transonic tunnel over a range of Mach numbers from 0.60 to 1.20. The arrow-wing transport configuration with engines suspended over the wing was tested at angles of attack from -4 deg to 6 deg and jet total pressure ratios from 1 to approximately 13. Wing-tip leading edge flap deflections of -10 deg to 10 deg were tested with the wing-body configuration. Various nacelle locations (chordwise, spanwise, and vertical) were tested over the ranges of Mach numbers, angles of attack, and jet total-pressure ratios. The results show that reflecting the wing-tip leading edge flap from 0 deg to -10 deg increased the maximum lift-drag ratio by 1.0 at subsonic speeds. Jet exhaust interference effects were negligible.
    Keywords: AERODYNAMICS
    Type: NASA-TM-80145 , L-12811
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Ablative liner locates hotspots (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Ablative liner quantifies local-heating effects in combustion chambers and other applications. By identifying hotspots and helping to map heat-flux patterns, liner is useful tool for research in engine design. Liner permanently records heat flux at each point by depth of ablation due to local heating. Technique determines best locations for thermocouples for more extensive testing.
    Keywords: MECHANICS
    Type: MSC-16981 , NASA Tech Briefs (ISSN 0145-319X); 2; 4; P. 3
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Primary-controlled ac-to-dc power converter (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Switch operation of power transformer/rectifier dc power supply requires fewer turns of larger wire and regulates output voltage.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: MFS-23198 , NASA Tech Briefs (ISSN 0145-319X); 2; 4; P. 3
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    An Operational Assessment of the MODIS False Color Composite with the Great Falls, Montana National Weather Service (2009)
    In:  Other Sources
    Details
    Publication Date: 2019-07-19
    Description: The close and productive collaborations between the NWS Warning and Forecast Office (WFO) in Great Falls, MT and the Short Term Prediction and Research Transition (SPORT) Center at NASA/Marshall Space Flight Center have provided a unique opportunity for science sharing and technology transfer. In particular, SPoRT has provided a false color composite product derived from MODIS data, which is part of NASA's Earth Observing System. This product is designed to delineate snow and ice covered ground, bare ground and clouds. The Great Falls WFO has been a test bed of the MODIS false color composite as a tool in operations to monitor the development and dissipation of snow cover In particular, preliminary applications have shown that the product can be used to monitor snow cover in remote locations as well as ice in rivers. This information can lead to improved assessments of flooding potential during post event conditions where rapid melting and runoff are anticipated. The potential of this product on future geostationary satellites may substantially contribute to the NWS mission by providing enhanced situational awareness. The operational use of this product has been transitioned at WFO Great Falls through a process of product implementation, discussions with the service hydrologist and forecasters, and post event analysis. A concentrated assessment period from January to March, 2008 was initiated to investigate the impact of the MODIS false color product on WFO Great Falls' operations. This presentation will emphasize the impact the MODIS false color product had in the WFO's situational awareness and how best this information can be used to influence operational decisions.
    Keywords: Meteorology and Climatology
    Type: 89th American Meteorological Society Annual Meeting; Jan 11, 2009 - Jan 15, 2009; Phoenix, AZ; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Advanced Lithium-Ion Cell Development for NASA's Constellation Missions (2008)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Energy Storage Project of NASA s Exploration Technology Development Program is developing advanced lithium-ion batteries to meet the requirements for specific Constellation missions. NASA GRC, in conjunction with JPL and JSC, is leading efforts to develop High Energy and Ultra High Energy cells for three primary Constellation customers: Altair, Extravehicular Activities (EVA), and Lunar Surface Systems. The objective of the High Energy cell development is to enable a battery system that can operationally deliver approximately 150 Wh/kg for 2000 cycles. The Ultra High Energy cell development will enable a battery system that can operationally deliver 220 Wh/kg for 200 cycles. To accomplish these goals, cathode, electrolyte, separator, and safety components are being developed for High Energy Cells. The Ultra High Energy cell development adds lithium alloy anodes to the component development portfolio to enable much higher cell-level specific energy. The Ultra High Energy cell development is targeted for the ascent stage of Altair, which is the Lunar Lander, and for power for the Portable Life support System of the EVA Lunar spacesuit. For these missions, mass is highly critical, but only a limited number of cycles are required. The High Energy cell development is primarily targeted for Mobility Systems (rovers) for Lunar Surface Systems, however, due to the high risk nature of the Ultra High Energy cell development, the High Energy cell will also serve as a backup technology for Altair and EVA. This paper will discuss mission requirements and the goals of the material, component, and cell development efforts in further detail.
    Keywords: Lunar and Planetary Science and Exploration
    Type: E-17370 , NASA Aerospace Battery Workshop; Nov 17, 2008 - Nov 20, 2008; Huntsville, AL; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Feasibility of Mixed Equipage Operations in the Same Airspace (2009)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This study used a human-in-the-loop simulation to examine the feasibility of mixed equipage operations in an automated separation assurance environment under higher traffic densities. The study involved two aircraft equipage alternatives - with and without data link- and four traffic conditions. In all traffic conditions the unequipped traffic count was increased linearly throughout the scenario from approximately 5 to 20 aircraft. Condition One consisted solely of this unequipped traffic, while the remaining three conditions also included a constant number of equipped aircraft operating within the same airspace: 15 equipped aircraft in condition two, 30 in condition three, and 45 in condition four. If traffic load became excessive during any run, participants were instructed to refuse sector entry to inbound unequipped aircraft until sector load became manageable. Results showed a progressively higher number of unequipped aircraft turned away under the second, third, and fourth scenario conditions. Controller workload also increased progressively. Participants rated the mixed operations concept as acceptable, with some qualifications about procedures and information displays. These results showed that mixed operations might be feasible in the same airspace, if unequipped aircraft count is held to a workable level. This level will decrease with increasing complexity. The results imply that integrated airspace configuration is feasible to a limit. The results also indicate that the conflict detection and resolution automation, equipage, and traffic density are important factors that will need to be considered for airspace configuration.
    Keywords: Aeronautics (General)
    Type: ARC-E-DAA-TN561 , Eighth USA/Europe Air Traffic Management Research and Development Seminar (ATM2009); Jun 29, 2009 - Jul 02, 2009; Napa, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Charge coupled devices for intensified imager applications (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Three types of CCD sensors have been successfully incorporated into ICCD (intensified CCD) tubes. Intensifier tubes of varying design and application have been manufactured by three different manufacturers. Typical characteristics of the thinned CCDs incorporated into these ICCD's will be presented. Problems concerning the compatibility of tube processing and CCD performance will be discussed, as well as the procedures used to minimize CCD degradation during tube processing. ICCD tube characteristics will also be presented.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Solid state imaging devices; Seminar; Aug 23, 1977 - Aug 24, 1977; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
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