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  • Other Sources  (701)
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  • 1
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    The effective yield of a nuclear explosion in a small cavity in geologic material: Enhanced coupling revisited (1989)
    In:  J. Geophys. Res., Jena, Physica-Verlag, vol. 94, no. B6, pp. 12375-12385, pp. L24313, (ISSN: 1340-4202)
    Details
    Publication Date: 1989
    Keywords: Nuclear explosion ; DeconvolutionP ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    A flexural-cantilever simple-shear/pure-shear model of continental lithosphere extension: application to the Jeanne d'Arc Basin, Grand Banks and Viking Graben, North Sea (1991)
    Geol. Soc. Spec. Publications, No. 56
    In:  Bull., Polar Proj. OP-O3A4, The Geometry of Normal Faults, London, Geol. Soc. Spec. Publications, No. 56, vol. 66, no. 2, pp. 41-60, (ISBN 0080419208)
    Details
    Publication Date: 1991
    Keywords: Tectonics ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Stress ; bending ; listric ; Fault zone
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Effects of changing water content and atmospheric pressure on radon flux from surfaces of five soil types (1990)
    In:  Geophys. Res. Lett., Kyoto, AGU, vol. 17, no. B4, pp. 817-820, pp. B04306, (ISSN: 1340-4202)
    Details
    Publication Date: 1990
    Keywords: Earthquake precursor: chemical (Rn, water(-level,...) ; Earthquake precursor: prediction research ; GRL
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Magnetic cloud passage at Earth and associated substorm activity (1992)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: An approach to the study of the solar wind-magnetosphere interaction by signal type, that is, by examining the effect in the magnetosphere of well defined interplanetary structures, is presented. Focus is on the response of the magnetosphere to interplanetary magnetic clouds. Among their properties are: the slow and smooth variation of the magnetic field vector, with fluctuation level well below common interplanetary values; the similarly well behaved bulk flow; the wide range of field and flow parameters; and the longevity of passage (1 to 2 days). If the magnetic cloud is oriented such that a long period of uninterruptedly northward pointing field is followed by a long interval of continuously southward pointing field, then the transition of the magnetosphere from a quiescent state (the 'ground state') to a very active state can be studied, the latter being sustained by continued forcing from the magnetic cloud. A synopsis of the main findings of a recent study in such an interaction is given, concentrating on the substorm activity attending the second part of cloud passage.
    Keywords: GEOPHYSICS
    Type: ESA, Substorms 1; p 371-376
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Evidence from carbon isotope measurements for diverse origins of sedimentary hydrocarbons (1990)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The organic matter found in sedimentary rocks must derive from many sources; not only from ancient primary producers but also from consumers and secondary producers. In all of these organisms, isotope effects can affect the abundance and distribution of 13C in metabolites. Here, by using an improved form of a previously described technique in which the effluent of a gas chromatograph is continuously analysed isotopically, we report evidence of the diverse origins of sedimentary organic matter. The record of 13C abundances in sedimentary carbonate and total organic carbon can be interpreted in terms of variations in the global carbon cycle. Our results demonstrate, however, that isotope variations within sedimentary organic mixtures substantially exceed those observed between samples of total organic carbon. Resolution of isotope variations at the molecular level offers a new and convenient means of refining views both of localized palaeoenvironments and of control mechanisms within the global carbon cycle.
    Keywords: Exobiology
    Type: Nature (ISSN 0028-0836); Volume 343; 6255; 254-6
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    The origin of mesoderm in phoronids (2002)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Descriptive studies of phoronid development have concluded that the mesoderm of these animals originates from the endoderm during gastrulation. This interpretation has been tested by labeling one blastomere of 4- through 16-cell embryos and examining the position and germ layers occupied by the labeled clones of cells in the larva. No 2 injections gave rise to identical clones of cells, suggesting that the cleavage program does not generate cells of unique identity and that cell fates are established at later developmental time points. In many cases, a relatively large sector composed of ectodermal cells was labeled. When these labeled cells were adjacent to the mouth or anus of the larva, muscle and mesenchyme cells originated from the labeled clones. Under these circumstances, nerve cells also originated from these labeled sectors. These labeling studies also showed that endodermal cells can give rise to mesodermal and neural cells. These results suggest that nerve and muscle cells are induced to form at ectodermal-endodermal boundaries from both germ layers. These marking experiments also confirmed the observation that nerve cells originate both from the apical organ and the trunk region and show for the first time that the intestine originates by ingression of posterior ectoderm.
    Keywords: Life Sciences (General)
    Type: Developmental biology (ISSN 0012-1606); Volume 252; 2; 301-11
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Dayside ionospheric convection changes in response to long-period interplanetary magnetic field oscillations - Determination of the ionospheric phase velocity (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Ground magnetic field perturbations recorded by the CANOPUS magnetometer network in the 7 to 13 MLT sector are used to examine how reconfigurations of the dayside polar ionospheric flow take place in response to north-south changes of the IMF. During the 6-h interval in question, IMF Bz oscillates between +/- 7 nT with about a 1-h period. Corresponding variations in the ground magnetic disturbance are observed which we infer are due to changes in ionospheric flow. Cross correlation of the data obtained from two ground stations at 73.5 deg magnetic latitude, but separated by about 2 hours in MLT, shows that changes in the flow are initiated in the prenoon sector (about 10 MLT) and then spread outward toward dawn and dusk with a phase speed of about 5 km/s over the longitude range about 8 to 12 MLT, slowing to about 2 km/s outside this range. Cross correlating the data from these ground stations with IMP 8 IMF Bz records produces a MLT variation in the ground response delay relative to the IMF which is compatible with these deduced phase speeds.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 97; A12; p. 19,373-19,380.
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Manned Mars aerobrake vehicle design issues (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: Space Technology - Industrial and Commercial Applications (ISSN 0892-9270); 12; 3; p. 313-324.
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Cross-calibration between airborne SAR sensors (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: As Synthetic Aperture Radar (SAR) system performance and experience in SAR signature evaluation increase, quantitative analysis becomes more and more important. Such analyses require an absolute radiometric calibration of the complete SAR system. To keep the expenditure on calibration of future multichannel and multisensor remote sensing systems (e.g., X-SAR/SIR-C) within a tolerable level, data from different tracks and different sensors (channels) must be cross calibrated. The 1989 joint E-SAR/DC-8 SAR calibration campaign gave a first opportunity for such an experiment, including cross sensor and cross track calibration. A basic requirement for successful cross calibration is the stability of the SAR systems. The calibration parameters derived from different tracks and the polarimetric properties of the uncalibrated data are used to describe this stability. Quality criteria for a successful cross calibration are the agreement of alpha degree values and the consistency of radar cross sections of equally sized corner reflectors. Channel imbalance and cross talk provide additional quality in case of the polarimetric DC-8 SAR.
    Keywords: AIRCRAFT INSTRUMENTATION
    Type: IEEE Transactions on Geoscience and Remote Sensing (ISSN 0196-2892); 31; 1; p. 237-245.
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Radial expansion of an ideal MHD configuration and the temporal development of the magnetic field (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: We study the free radial expansion of a 3-component magnetic configuration. The emphasis of this paper is on the behavior of a field undergoing non-self-similar expansion. Comparing our results with the evolution of a magnetic configuration expanding self-similarly, we find that self-similar expansion appears as the asymptotic limit (with time) of the general case. Using a model field we show that a non-self-similar velocity profile need not have a strict monotonic decrease with time.
    Keywords: PLASMA PHYSICS
    Type: In: Solar Wind Seven; Proceedings of the 3rd COSPAR Colloquium, Goslar, Germany, Sept. 16-20, 1991 (A93-33554 13-92); p. 615-618.
    Format: text
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