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  • 1
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    The coseismic geodetic signature of the 1999 Hector Mine earthquake (2000)
    In:  Geophys. Res. Lett., Taipei, Am. Inst. Min. Metal. Petr. Eng., vol. 27, no. 17, pp. 2733-2736, pp. 2324, (ISSN 0343-5164)
    Details
    Publication Date: 2000
    Description: Hector Mine Earthquake seen as a single fault: The Hector Mine earthquake ruptured in California in October 1999. A network of 34 continuously recording Global Positioning System receivers in Southern California recorded the displacements of stations to the west of the rupture. Hurst et al. analyze the Global Positioning System data to determine the co-seismic displacements. They invert the deformation data to estimate a best-fit equivalent to a single fault 46.2 km long and 8.2 km wide, which slipped 301 cm right lateral strike-slip and 145 cm of east-up dip slip.
    Keywords: Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Geodesy ; Earthquake ; California ; 1243 ; Geodesy ; and ; gravity ; Space ; geodetic ; surveys ; 7215 ; Seismology ; Earthquake ; parameters ; 8123 ; Tectonophysics ; Dynamics, ; seismotectonics ; GRL
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Rapid postseismic transients in subduction zones from continuous Global Positioning System (2002)
    In:  J. Geophys. Res., Hannover, Conseil de l'Europe, vol. 107, no. B10, pp. ETG 10-1 to ETG 10-10, pp. 2241, (ISSN: 1340-4202)
    Details
    Publication Date: 2002
    Keywords: Geodesy ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Inelastic ; Rheology ; Subduction zone ; 7209 ; Seismology: ; Earthquake ; dynamics ; and ; mechanics ; 3040 ; Marine ; Geology ; and ; Geophysics: ; Plate ; tectonics ; (8150, ; 8155, ; 8157, ; 8158) ; 8150 ; Tectonophysics: ; Plate ; boundary--general ; (3040) ; 7230 ; Seismology: ; Seismicity ; and ; seismotectonics ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Slow but nor silent (2003)
    In:  Science, Hannover, Conseil de l'Europe, vol. 300, no. 5627, pp. 1886-1887, pp. 2241, (ISSN: 1340-4202)
    Details
    Publication Date: 2003
    Keywords: Seismology ; Canada ; Subduction zone ; Seismicity ; slow ; red ; Earthquake ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Stress ; Earthquake precursor: prediction research
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Precursory transient slip during the 2001 Mw = 8.4 Peru earthquake sequence from continuous Global Positioning System (2002)
    In:  Geophys. Res. Lett., Hannover, Conseil de l'Europe, vol. 29, no. 21, pp. 28-1 to 28-4, pp. 2032, (ISSN: 1340-4202)
    Details
    Publication Date: 2002
    Keywords: Earthquake precursor: deformation or strain ; Earthquake precursor: prediction research ; South ; America ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Earthquake ; Geodesy ; GRL ; 1206 ; Geodesy ; and ; Gravity: ; Crustal ; movements--interplate ; (8155) ; 7209 ; Seismology: ; Earthquake ; dynamics ; and ; mechanics ; 7230 ; Seismicity ; 8123 ; Tectonophysics: ; Dynamics, ; seismotectonics
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    Singular Isothermal Disks and the Formation of Multiple Stars (2000)
    In:  Other Sources
    Details
    Publication Date: 2011-08-23
    Description: A crucial missing ingredient in previous theoretical studies of fragmentation is the inclusion of dynamically important levels of magnetic fields. As a minimal model for a candidate presursor to the formation of binary and multiple stars, we therefore consider the equilibrium configuration of isopedically magnetized, scale-free, singular isothermal disks, without the assumption of axial symmetry. We find that lopsided (M = 1) configurations exist at any dimensionless rotation rate, including zero. Multiple-lobed (M = 2, 3, 4, ...) configurations bifurcate from an underlying axisymmetric sequence at progressively higher dimensionless rates of rotation, but such nonaxisymmetric sequences always terminate in shockwaves before they have a chance to fission into separate bodies. We advance the hypothesis that binary and multiple star-formation from smooth (i.e., not highly turbulent) starting states that are supercritical but in unstable mechanical balance requires the rapid (i.e., dynamical) loss of magnetic flux at some stage of the ensuing gravitational collapse.
    Keywords: Astrophysics
    Type: The Astronomical Society of the Pacific; United States|ASP Conference Series: Euroconference on Stellar Clusters and Associations; Volume 198; 1-10
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Fast Quaternion Attitude Estimation from Two Vector Measurements (2001)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: Many spacecraft attitude determination methods use exactly two vector measurements. The two vectors are typically the unit vector to the Sun and the Earth's magnetic field vector for coarse "sun-mag" attitude determination or unit vectors to two stars tracked by two star trackers for fine attitude determination. Existing closed-form attitude estimates based on Wahba's optimality criterion for two arbitrarily weighted observations are somewhat slow to evaluate. This paper presents two new fast quaternion attitude estimation algorithms using two vector observations, one optimal and one suboptimal. The suboptimal method gives the same estimate as the TRIAD algorithm, at reduced computational cost. Simulations show that the TRIAD estimate is almost as accurate as the optimal estimate in representative test scenarios.
    Keywords: Spacecraft Instrumentation and Astrionics
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    NASA TECHNICAL REPORTS
  • 7
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    Attitude Error Representations for Kalman Filtering (2002)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: The quaternion has the lowest dimensionality possible for a globally nonsingular attitude representation. The quaternion must obey a unit norm constraint, though, which has led to the development of an extended Kalman filter using a quaternion for the global attitude estimate and a three-component representation for attitude errors. We consider various attitude error representations for this Multiplicative Extended Kalman Filter and its second-order extension.
    Keywords: Cybernetics, Artificial Intelligence and Robotics
    Format: application/pdf
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  • 8
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    MEMS-Based Satellite Micropropulsion Via Catalyzed Hydrogen Peroxide Decomposition (2001)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: Micro-electromechanical systems (MEMS) techniques offer great potential in satisfying the mission requirements for the next generation of "micro-scale" satellites being designed by NASA and Department of Defense agencies. More commonly referred to as "nanosats", these miniature satellites feature masses in the range of 10-100 kg and therefore have unique propulsion requirements. The propulsion systems must be capable of providing extremely low levels of thrust and impulse while also satisfying stringent demands on size, mass, power consumption and cost. We begin with an overview of micropropulsion requirements and some current MEMS-based strategies being developed to meet these needs. The remainder of the article focuses the progress being made at NASA Goddard Space Flight Center towards the development of a prototype monopropellant MEMS thruster which uses the catalyzed chemical decomposition of high concentration hydrogen peroxide as a propulsion mechanism. The products of decomposition are delivered to a micro-scale converging/diverging supersonic nozzle which produces the thrust vector; the targeted thrust level approximately 500 N with a specific impulse of 140-180 seconds. Macro-scale hydrogen peroxide thrusters have been used for satellite propulsion for decades; however, the implementation of traditional thruster designs on a MEMS scale has uncovered new challenges in fabrication, materials compatibility, and combustion and hydrodynamic modeling. A summary of the achievements of the project to date is given, as is a discussion of remaining challenges and future prospects.
    Keywords: Spacecraft Propulsion and Power
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  • 9
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    Thermal Aspects of Lithium-Ion Cells (2000)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Objective of this investigation is to provide the necessary inputs for a thermal model of the Li-ion battery for the Mars 2001 Lander. Two alternate configurations of this battery are under development: a) prismatic parallel plate, and b) cylindrical spiral wound. Required thermal inputs for both consist of the following: a) heat generation rates, b) thermal mass, and c) thermal conductivity. Thermal mass and conductivity were computed on the basis of known properties and configuration of the cell components. The heat generation rates were taken as the product of current and difference between open circuit voltage (OCV) and operating voltages (CCV) at a given state-of charge (SOC). Herein, it was assumed that the enthalpy voltage was equal to the OCV. OCV vs SOC data were obtained experimentally and CCV vs SOC were taken from previously obtained discharge data.
    Keywords: Electronics and Electrical Engineering
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    NASA TECHNICAL REPORTS
  • 10
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    Thermal Aspects of Lithium Ion Cells (2000)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: This viewgraph presentation outlines the development of a thermal model of Li-ion cells in terms of heat generation, thermal mass, and thermal resistance. Intended for incorporation into battery model. The approach was to estimate heat generation: with semi-theoretical model, and then to check accuracy with efficiency measurements. Another objective was to compute thermal mass from component weights and specific heats, and to compute the thermal resistance from component dimensions and conductivities. Two lithium batteries are compared, the Cylindrical lithium battery, and the prismatic lithium cell. It reviews methodology for estimating the heat generation rate. Graphs of the Open-circuit curves of the cells and the heat evolution during discharge are given.
    Keywords: Energy Production and Conversion
    Type: The 1999 NASA Aerospace Battery Workshop; 275-286; NASA/CP-2000-209959
    Format: application/pdf
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