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  • Other Sources  (273)
  • 2020-2022  (4)
  • 2015-2019  (105)
  • 1990-1994  (164)
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  • 1
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    Studies of molecular properties of polymeric materials (1990)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: Aerospace environment effects (high energy electrons, thermal cycling, atomic oxygen, and aircraft fluids) on polymeric and composite materials considered for structural use in spacecraft and advanced aircraft are examined. These materials include Mylar, Ultem, and Kapton. In addition to providing information on the behavior of the materials, attempts are made to relate the measurements to the molecular processes occurring in the material. A summary and overview of the technical aspects are given along with a list of the papers that resulted from the studies. The actual papers are included in the appendices and a glossary of technical terms and definitions is included in the front matter.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TM-101854 , NAS 1.15:101854 , PTR-90-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Effects Of Irradiation By Electrons On Two Polyimides (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Polyimides of new class, known as polyetherimides, used for composites and castings. Study undertaken to compare effects of electron radiation, in doses expected for 30-year missions in geosynchronous orbit, on molecular structures and tensile properties of two commercially available polyimides: polypyromellitimide and polyetherimide. Findings helpful in development of new polymers that endure radiation, leading to synthesis of polymers not having methyl groups or other moieties that are sources of hydrogen, inhibiting self-mending. Significance of study for polymer industry relating to structures in outer space considerable.
    Keywords: MATERIALS
    Type: LAR-14309 , NASA Tech Briefs (ISSN 0145-319X); 16; 10; P. 72
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    High-speed dynamic domino circuit implemented with gaas mesfets (1990)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A dynamic logic circuit (AND or OR) utilizes one depletion-mode metal-semiconductor FET for precharging an internal node A, and a plurality of the same type of FETs in series, or a FET in parallel with one or more of the series connected FETs for implementing the logic function. A pair of FETs are connected to provide an output inverter with two series diodes for level shift. A coupling capacitor may be employed with a further FET to provide level shifting required between the inverter and the logic circuit output terminal. These circuits may be cascaded to form a domino chain.
    Keywords: Electronics and Electrical Engineering
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Gallium Arsenide Domino Circuit (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Advantages include reduced power and high speed. Experimental gallium arsenide field-effect-transistor (FET) domino circuit replicated in large numbers for use in dynamic-logic systems. Name of circuit denotes mode of operation, which logic signals propagate from each stage to next when successive stages operated at slightly staggered clock cycles, in manner reminiscent of dominoes falling in a row. Building block of domino circuit includes input, inverter, and level-shifting substages. Combinational logic executed in input substage. During low half of clock cycle, result of logic operation transmitted to following stage.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-17417 , NASA Tech Briefs (ISSN 0145-319X); 14; 3; P. 36
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Equilibrium Climate Sensitivity Estimated by Equilibrating Climate Models (2021)
    Details
    Publication Date: 2021-10-12
    Description: The methods to quantify equilibrium climate sensitivity are still debated. We collect millennial-length simulations of coupled climate models and show that the global mean equilibrium warming is higher than those obtained using extrapolation methods from shorter simulations. Specifically, 27 simulations with 15 climate models forced with a range of CO2 concentrations show a median 17% larger equilibrium warming than estimated from the first 150 years of the simulations. The spatial patterns of radiative feedbacks change continuously, in most regions reducing their tendency to stabilizing the climate. In the equatorial Pacific, however, feedbacks become more stabilizing with time. The global feedback evolution is initially dominated by the tropics, with eventual substantial contributions from the mid-latitudes. Time-dependent feedbacks underscore the need of a measure of climate sensitivity that accounts for the degree of equilibration, so that models, observations, and paleo proxies can be adequately compared and aggregated to estimate future warming.
    Keywords: 551.6 ; equilibrium climate sensitivity ; climate models
    Language: English
    Type: map
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    CITATION GEO-LEO
  • 6
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    Origin of isolated seamounts in the Canary Basin (East Atlantic): The role of plume material in the origin of seamounts not associated with hotspot tracks (2021)
    Details
    Publication Date: 2021-12-03
    Description: In contrast to seamount chains, small solitary seamounts/seamount groups have rarely been sampled despite their large number and therefore their origins remain enigmatic. Here we present new 40Ar/39Ar, trace element and Nd-Hf-Pb isotope data from the solitary Demenitskoy Seamount, the isolated Tolkien seamount group and the Krylov Seamount and Ridge in the Canary Basin, Central Atlantic Ocean. Their chemical compositions range from intraplate ocean-island-basalt (Demenitskoy) to mid-ocean-ridge-basalt (Tolkien and Krylov) types. Lavas from all three seamount groups, however, show geochemical evidence for involvement of enriched Canary/Cape Verde plume material. Seismic tomography shows that large areas around these mantle plumes consist of dispersed low-velocity material, which could represent diffusely-upwelling plume mantle. Melts from such upwelling mantle could form isolated seamounts. Diffuse upwelling of plume material is likely to be extremely widespread but has been poorly studied to date. Significance Statement A fundamental question concerns the origin of the hundreds of thousands of solitary seamounts and small isolated clusters of such seamounts on the seafloor of the world's ocean basins. Most of them do not fit into any currently accepted models (e.g. they are not associated with a linear hotspot track or plate boundary processes). Their formation could therefore represent a new kind of intraplate volcanism that in fact could be extremely widespread but has been thus far largely neglected. In this manuscript, we report geochemical data from three isolated seamount sites in the Canary Basin and propose a provocative model for their formation that can also be applied to isolated seamounts elsewhere. Our study is therefore also a plea for the long overdue systematic investigation of small seamount volcanism in the world's ocean basins. I hereby confirm that all the data and interpretations are new and have not been published elsewhere. All co-authors have been actively involved in this work, have approved the manuscript and agreed to this submission.
    Keywords: 551 ; Canary Basin ; seamounts ; isotopic compositions
    Language: English
    Type: map
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    CITATION GEO-LEO
  • 7
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    Tomographic inversion of Rg wave group velocities for regional near-surface velocity structure (1993)
    In:  J. Geophys. Res., New York, Conseil de l'Europe, vol. 98, no. B4, pp. 6579-6588, pp. B07307, (ISSN: 1340-4202)
    Details
    Publication Date: 1993
    Keywords: Velocity depth profile ; Tomography ; Inversion ; Rayleigh waves ; 5460 ; Planetary ; Sciences: ; Physical ; properties ; of ; materials ; 5470 ; Planetary ; Sciences: ; Surface ; materials ; and ; properties ; 8494 ; Volcanology: ; Instruments ; and ; techniques ; Kocaoglu ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 8
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    A preliminary study on the 1786 Kangding earthquake deformation characteristics (1990)
    In:  J. Seism. Res., Kunming, China, 4, vol. 13, no. 1763, pp. 51-60, pp. L13613, (ISSN: 1340-4202)
    Details
    Publication Date: 1990
    Keywords: Earthquake ; Earthquake precursor: deformation or strain ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; China ; JSR
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    BIBLIOGRAPHY SEISMOLOGY
  • 9
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    Crustal deformation in the southern Longitudinal Valley area, eastern Taiwan (1992)
    In:  J. Geol. Soc. China, Taipei, Academia Sinica, vol. 35, no. 1-3, pp. 219-230, pp. L13610, (ISSN: 1340-4202)
    Details
    Publication Date: 1992
    Keywords: Crustal deformation (cf. Earthquake precursor: deformation or strain) ; China
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    BIBLIOGRAPHY SEISMOLOGY
  • 10
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    Space-time correlations of b-values with stress release (1992)
    In:  Pageoph, Luxembourg, Conseil de l'Europe, vol. 139, no. 6, pp. 449-462, pp. 1068, (ISSN: 1340-4202)
    Details
    Publication Date: 1992
    Keywords: Seismicity ; Stress ; Stress drop ; Statistical investigations
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    BIBLIOGRAPHY SEISMOLOGY
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