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  • 1
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    Continuous Global Positioning System observations of postseismic deformation following the 16 October 1999 Hector Mine, California, earthquake (Mw 7.1) (2002)
    In:  Bull. Seism. Soc. Am., Taipei, Am. Inst. Min. Metal. Petr. Eng., vol. 92, no. 4, pp. 1403-1422, pp. 2324, (ISSN 0343-5164)
    Details
    Publication Date: 2002
    Keywords: Earthquake ; USA ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Inelastic ; Rheology ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Southern California Permanent Global Positioning System Geodetic Array: Continuous measurements of regional crustal deformation between the 1992 Landers and 1994 Northridge earthquakes (1997)
    In:  J. Geophys. Res., Warszawa, Elsevier, vol. 102, no. B8, pp. 18,013-18,033, pp. L11309, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1997
    Keywords: Geodesy ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Earthquake ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Links between erosion, runoff variability and seismicity in the Taiwan orogen (2003)
    In:  Nature, Warszawa, Conseil de l'Europe, vol. 426, no. 6967, pp. 648-651, pp. L19306, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 2003
    Keywords: Seismicity ; Geol. aspects ; China ; Structural geology ; Tectonics
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Earthquake prediction: the null hypothesis (1997)
    In:  Geophys. J. Int., Houston, Akademie-Verlag, vol. 131, no. 47, pp. 495-499, pp. L08310, (ISSN: 1340-4202)
    Details
    Publication Date: 1997
    Keywords: Earthquake precursor: prediction research ; Earthquake precursor: statistical anal. of seismicity ; Statistical investigations ; GJI
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    Alfven wave resonances and flow induced by non-linear Alfven waves in a stratified atmosphere (1995)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A nonlinear, time-dependent, ideal MHD code has been developed and used to compute the flow induced by nonlinear Alfven waves propagating in an isothermal, stratified, plane-parallel atmosphere. The code is based on characteristic equations solved in a Lagrangian frame and is highly accurate. Results show that resonance behavior of Alfven waves exists in the presence of a continuous density gradient and that the waves with periods corresponding to resonant peaks exert considerably more force on the medium than off-resonance periods; this leads to enhanced flow. If only off-peak periods are considered, the relationship between the wave period and induced longitudinal velocity shows that short period WKB waves push more on the background medium than longer period, non-WKB, waves. The results also show the development of the longitudinal waves produced by the finite amplitude of the Alfven waves. The longitudinal wave becomes strong as the Alfven wave relative amplitude grows above 10 percent and will lead to strong damping of the Alfven waves.
    Keywords: Solar Physics
    Type: International Solar Wind 8 Conference; 66; NASA-CR-199940
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Generalized Support Software: Domain Analysis and Implementation (1995)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: For the past five years, the Flight Dynamics Division (FDD) at NASA's Goddard Space Flight Center has been carrying out a detailed domain analysis effort and is now beginning to implement Generalized Support Software (GSS) based on this analysis. GSS is part of the larger Flight Dynamics Distributed System (FDDS), and is designed to run under the FDDS User Interface / Executive (UIX). The FDD is transitioning from a mainframe based environment to systems running on engineering workstations. The GSS will be a library of highly reusable components that may be configured within the standard FDDS architecture to quickly produce low-cost satellite ground support systems. The estimates for the first release is that this library will contain approximately 200,000 lines of code. The main driver for developing generalized software is development cost and schedule improvement. The goal is to ultimately have at least 80 percent of all software required for a spacecraft mission (within the domain supported by the GSS) to be configured from the generalized components.
    Keywords: Computer Programming and Software
    Type: Software Engineering Laboratory Series: Collected Software Engineering Papers; Volume 13; 5-3-5-8; NASA/TM-1998-208615/VOL13
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    NASA TECHNICAL REPORTS
  • 7
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    The Impact of Ada and Object-Oriented Design in NASA Goddard's Flight Dynamics Division (1996)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: This paper presents the highlights and key findings of 10 years of use and study of Ada and object-oriented design in NASA Goddard's Flight Dynamics Division (FDD). In 1985, the Software Engineering Laboratory (SEL) began investigating how the Ada language might apply to FDD software development projects. Although they began cautiously using Ada on only a few pilot projects, they expected that, if the Ada pilots showed promising results, the FDD would fully transition its entire development organization from FORTRAN to Ada within 10 years. However, 10 years later, the FDD still produced 80 percent of its software in FORTRAN and had begun using C and C++, despite positive results on Ada projects. This paper presents the final results of a SEL study to quantify the impact of Ada in the FDD, to determine why Ada has not flourished, and to recommend future directions regarding Ada. Project trends in both languages are examined as are external factors and cultural issues that affected the infusion of this technology. The detailed results of this study were published in a formal study report in March of 1995. This paper supersedes the preliminary results of this study that were presented at the Eighteenth Annual Software Engineering Workshop in 1993.
    Keywords: Computer Programming and Software
    Type: Software Engineering Laboratory Series: Collected Software Engineering Papers; Volume 14; NASA/TM-1998-208613
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    The Generalized Support Software (GSS) Domain Engineering Process: An Object-Oriented Implementation and Reuse Success at Goddard Space Flight Center (1997)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: The Flight Dynamics Division (FDD) of NASA's Goddard Space Flight Center (GSFC) recently embarked on a far-reaching revision of its process for developing and maintaining satellite support software. The new process relies on an object-oriented software development method supported by a domain specific library of generalized components. This Generalized Support Software (GSS) Domain Engineering Process is currently in use at the NASA GSFC Software Engineering Laboratory (SEL). The key facets of the GSS process are (1) an architecture for rapid deployment of FDD applications, (2) a reuse asset library for FDD classes, and (3) a paradigm shift from developing software to configuring software for mission support. This paper describes the GSS architecture and process, results of fielding the first applications, lessons learned, and future directions
    Keywords: Computer Programming and Software
    Type: Software Engineering Laboratory Series: Collected Software Engineering Papers; Volume 15; 189-195; NASA/TM-1998-208614/VOL15
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Using AppletMagic(tm) to Implement an Orbit Propagator: New Life for Ada Objects (1997)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: This paper will discuss the use of the Intermetrics AppletMagic tool to build an applet to display a satellite ground track on a world map. This applet is the result of a prototype project that was developed by the Goddard Space Flight Center's Flight Dynamics Division (FDD), starting in June of 1996. Both Version 1 and Version 2 of this applet can be accessed via the URL http://fdd.gsfc.nasa.gov/Java.html. This paper covers Version 1, as Version 2 did not make radical changes to the Ada part of the applet. This paper will briefly describe the design of the applet, discuss the issues that arose during development, and will conclude with lessons learned and future plans for the FDD's use of Ada and Java. The purpose of this paper is to show examples of a successful project using Oi AppletMagic, and to highlight some of the pitfalls that occurred along the way. It is hoped that this discussion will be useful both to users of AppletMagic and to organizations such as Intermetrics that develop new technology.
    Keywords: Computer Programming and Software
    Type: Software Engineering Laboratory Series: Collected Software Engineering Papers; Volume 15; 173-188; NASA/TM-1998-208614/VOL15
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    MEMS Reliability Assurance Activities at JPL (2000)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: An overview of Microelectromechanical Systems (MEMS) reliability assurance and qualification activities at JPL is presented along with the a discussion of characterization of MEMS structures implemented on single crystal silicon, polycrystalline silicon, CMOS, and LIGA processes. Additionally, common failure modes and mechanisms affecting MEMS structures, including radiation effects, are discussed. Common reliability and qualification practices contained in the MEMS Reliability Assurance Guideline are also presented.
    Keywords: Electronics and Electrical Engineering
    Format: application/pdf
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