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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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    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
  • 4
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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
  • 5
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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
  • 6
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    Feasibility of Mixed Equipage Operations in the Same Airspace (2009)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    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: Air Transportation and Safety
    Type: ARC-E-DAA-TN553
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Fundamental Technology Development for Gas-Turbine Engine Health Management (2007)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Integrated vehicle health management technologies promise to dramatically improve the safety of commercial aircraft by reducing system and component failures as causal and contributing factors in aircraft accidents. To realize this promise, fundamental technology development is needed to produce reliable health management components. These components include diagnostic and prognostic algorithms, physics-based and data-driven lifing and failure models, sensors, and a sensor infrastructure including wireless communications, power scavenging, and electronics. In addition, system assessment methods are needed to effectively prioritize development efforts. Development work is needed throughout the vehicle, but particular challenges are presented by the hot, rotating environment of the propulsion system. This presentation describes current work in the field of health management technologies for propulsion systems for commercial aviation.
    Keywords: Aircraft Design, Testing and Performance
    Type: E-16089 , AIAA Infotech @ Aerospace 2007 Conference; May 07, 2007 - May 10, 2007; Rohnert Park, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Adaptive Engine Technologies for Aviation CO2 Emissions Reduction (2006)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Adaptive turbine engine technologies are assessed for their potential to reduce carbon dioxide emissions from commercial air transports.Technologies including inlet, fan, and compressor flow control, compressor stall control, blade clearance control, combustion control, active bearings and enabling technologies such as active materials and wireless sensors are discussed. The method of systems assessment is described, including strengths and weaknesses of the approach. Performance benefit estimates are presented for each technology, with a summary of potential emissions reduction possible from the development of new, adaptively controlled engine components.
    Keywords: Aircraft Propulsion and Power
    Type: NASA/TM-2006-214392 , E-15670 , AIAA Paper 2006-5105 , 42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference; Jul 09, 2006 - Jul 12, 2006; Sacreamento, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Simulation of Terminal-Area Flight Management System Arrivals with Airborne Spacing (2007)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A simulation evaluated the feasibility and potential benefits of using decision support tools to support time-based airborne spacing and merging for aircraft arriving in the terminal area on charted Flight Management System (FMS) routes. Sixteen trials were conducted in each treatment combination of a 2X2 repeated-measures design. In trials 'with ground tools' air traffic controller participants managed traffic using sequencing and spacing tools. In trials 'with air tools' approximately seventy-five percent of aircraft assigned to the primary landing runway were equipped for airborne spacing, including flight simulators flown by commercial pilots. The results indicate that airborne spacing improves spacing accuracy and is feasible for FMS operations and mixed spacing equipage. Controllers and pilots can manage spacing clearances that contain two call signs without difficulty. For best effect, both decision support tools and spacing guidance should exhibit consistently predictable performance, and merging traffic flows should be well coordinated.
    Keywords: Air Transportation and Safety
    Type: Air Traffic Control Quarterly (Abstracts); 14; 1; 47-67
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    A Survey of Intelligent Control and Health Management Technologies for Aircraft Propulsion Systems (2005)
    In:  CASI
    Details
    Publication Date: 2019-07-11
    Description: Intelligent Control and Health Management technology for aircraft propulsion systems is much more developed in the laboratory than in practice. With a renewed emphasis on reducing engine life cycle costs, improving fuel efficiency, increasing durability and life, etc., driven by various government programs, there is a strong push to move these technologies out of the laboratory and onto the engine. This paper describes the existing state of engine control and on-board health management, and surveys some specific technologies under development that will enable an aircraft propulsion system to operate in an intelligent way--defined as self-diagnostic, self-prognostic, self-optimizing, and mission adaptable. These technologies offer the potential for creating extremely safe, highly reliable systems. The technologies will help to enable a level of performance that far exceeds that of today s propulsion systems in terms of reduction of harmful emissions, maximization of fuel efficiency, and minimization of noise, while improving system affordability and safety. Technologies that are discussed include various aspects of propulsion control, diagnostics, prognostics, and their integration. The paper focuses on the improvements that can be achieved through innovative software and algorithms. It concentrates on those areas that do not require significant advances in sensors and actuators to make them achievable, while acknowledging the additional benefit that can be realized when those technologies become available. The paper also discusses issues associated with the introduction of some of the technologies.
    Keywords: Aircraft Propulsion and Power
    Type: NASA/TM-2005-213622 , ARL-TR-3413 , E?15083
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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