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  • Data  (16)
  • Other Sources  (9)
  • 2020-2024  (13)
  • 2010-2014  (7)
  • 1975-1979  (5)
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  • 1
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    SPRITE: A TPS Test Bed for Ground and Flight (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Engineers in the Entry Systems and Technology Division at NASA Ames Research Center developed a fully instrumented, small atmospheric entry probe called SPRITE (Small Probe Reentry Investigation for TPS Engineering). SPRITE, conceived as a flight test bed for thermal protection materials, was tested at full scale in an arc-jet facility so that the aerothermal environments the probe experiences over portions of its flight trajectory and in the arc-jet are similar. This ground-to-flight traceability enhances the ability of mission designers to evaluate margins needed in the design of thermal protection systems (TPS) of larger scale atmospheric entry vehicles. SPRITE is a 14-inch diameter, 45 deg. sphere-cone with a conical aftbody and designed for testing in the NASA Ames Aerodynamic Heating Facility (AHF). The probe is a two-part aluminum shell with PICA (phenolic impregnated carbon ablator) bonded on the forebody and LI-2200 (Shuttle tile material) bonded to the aftbody. Plugs with embedded thermocouples, similar to those installed in the heat shield of the Mars Science Laboratory (MSL), and a number of distributed sensors are integrated into the design. The data from these sensors are fed to an innovative, custom-designed data acquisition system also integrated with the test article. Two identical SPRITE models were built and successfully tested in late 2010-early 2011, and the concept is currently being modified to enable testing of conformable and/or flexible materials.
    Keywords: Spacecraft Design, Testing and Performance
    Type: ARC-E-DAA-TN4730 , AFOSR/NASA/Sandia Ablation Workshop; Feb 28, 2012 - Mar 01, 2012; Lexington, KY; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    First All-Sky Search for Continuous Gravitational Waves from Unknown Sources in Binary Systems (2014)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: We present the first results of an all-sky search for continuous gravitational waves from unknown spinning neutron stars in binary systems using LIGO and Virgo data. Using a specially developed analysis program, the TwoSpect algorithm, the search was carried out on data from the sixth LIGO science run and the second and third Virgo science runs. The search covers a range of frequencies from 20 Hz to 520 Hz, a range of orbital periods from 2 to 2,254 h and a frequency- and period-dependent range of frequency modulation depths from 0.277 to 100 mHz. This corresponds to a range of projected semimajor axes of the orbit from 0.6 10(exp 3) ls to 6,500 ls assuming the orbit of the binary is circular. While no plausible candidate gravitational wave events survive the pipeline, upper limits are set on the analyzed data. The most sensitive 95% confidence upper limit obtained on gravitational wave strain is 2.3 10(exp 24) at 217 Hz, assuming the source waves are circularly polarized. Although this search has been optimized for circular binary orbits, the upper limits obtained remain valid for orbital eccentricities as large as 0.9. In addition, upper limits are placed on continuous gravitational wave emission from the low-mass x-ray binary Scorpius X-1 between 20 Hz and 57.25 Hz.
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN22620 , Physical Review D (ISSN 0031-899X) (e-ISSN 1536-6065); 90; 6; 062010
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    NASA TECHNICAL REPORTS
  • 3
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    SPRITE: A TPS Test Bed for Ground and Flight (2012)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: No abstract available
    Keywords: Spacecraft Design, Testing and Performance
    Type: ARC-E-DAA-TN4845 , 5th Ablation Workshop; Feb 28, 2012 - Mar 01, 2012; Lexington, KY; United States
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    NASA TECHNICAL REPORTS
  • 4
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    Multi-Mission System Analysis for Planetary Entry (M-SAPE) Version 1 (2014)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: This report describes an integrated system for Multi-mission System Analysis for Planetary Entry (M-SAPE). The system in its current form is capable of performing system analysis and design for an Earth entry vehicle suitable for sample return missions. The system includes geometry, mass sizing, impact analysis, structural analysis, flight mechanics, TPS, and a web portal for user access. The report includes details of M-SAPE modules and provides sample results. Current M-SAPE vehicle design concept is based on Mars sample return (MSR) Earth entry vehicle design, which is driven by minimizing risk associated with sample containment (no parachute and passive aerodynamic stability). By M-SAPE exploiting a common design concept, any sample return mission, particularly MSR, will benefit from significant risk and development cost reductions. The design provides a platform by which technologies and design elements can be evaluated rapidly prior to any costly investment commitment.
    Keywords: Spacecraft Design, Testing and Performance
    Type: NASA/TM2014-218507 , L-20440 , NF1676L-19269
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    NASA TECHNICAL REPORTS
  • 5
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    Seychelles coral record of changes in sea surface temperature bimodality in the western Indian Ocean from the Mid-Holocene to the present (2014)
    Springer
    In:  Climate Dynamics, 43 (3-4). pp. 689-708.
    Details
    Publication Date: 2019-09-23
    Description: We report fossil coral records from the Seychelles comprising individual time slices of 14–20 sclerochronological years between 2 and 6.2 kyr BP to reconstruct changes in the seasonal cycle of western Indian Ocean sea surface temperature (SST) compared to the present (1990–2003). These reconstructions allowed us to link changes in the SST bimodality to orbital changes, which were causing a reorganization of the seasonal insolation pattern. Our results reveal the lowest seasonal SST range in the Mid-Holocene (6.2–5.2 kyr BP) and around 2 kyr BP, while the highest range is observed around 4.6 kyr BP and between 1990 and 2003. The season of maximum temperature shifts from austral spring (September to November) to austral autumn (March to May), following changes in seasonal insolation over the past 6 kyr. However, the changes in SST bimodality do not linearly follow the insolation seasonality. For example, the 5.2 and 6.2 kyr BP corals show only subtle SST differences in austral spring and autumn. We use paleoclimate simulations of a fully coupled atmosphere–ocean general circulation model to compare with proxy data for the Mid-Holocene around 6 kyr BP. The model results show that in the Mid-Holocene the austral winter and spring seasons in the western Indian Ocean were warmer while austral summer was cooler. This is qualitatively consistent with the coral data from 6.2 to 5.2 kyr BP, which shows a similar reduction in the seasonal amplitude compared to the present day. However, the pattern of the seasonal SST cycle in the model appears to follow the changes in insolation more directly than indicated by the corals. Our results highlight the importance of ocean–atmosphere interactions for Indian Ocean SST seasonality throughout the Holocene. In order to understand Holocene climate variability in the countries surrounding the Indian Ocean, we need a much more comprehensive analysis of seasonally resolved archives from the tropical Indian Ocean. Insolation data alone only provides an incomplete picture.
    Type: Article , PeerReviewed
    Format: text
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    PAPER (OCEANREP)
  • 6
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    Pb and 137Cs chronology of heavy metal pollution in a sediment core from the German Bight (North Sea) (1978)
    Schweizerbart Science Publishers
    In:  Senckenbergiana Maritima, 10 (4/6). pp. 213-227.
    Details
    Publication Date: 2018-09-04
    Description: The pollution history of the metals iron, chromium, nickel, cobalt, zinc, lead, copper, cadmium, and mercury in a sediment profile from the German Bight (southeastern part of the North Sea; Förstner & Reineck, 1974) has been re-interpreted according to new radiometric age data from 210Pb and 137Cs concentrations. Between two units of relative uniform sedimentation - approx. 18 mm/y at 7-19 cm sediment depth and approx. 16 mm/y for the core section from 28-50 cm - a major hiatus and an interval of abnormally low sedimentation rate has been detected (19-28 cm) indicating that sediments deposited at the beginning of the century are directly covered by the most recent sediments. Contamination by Zn, Pb, Cu, Cd and Hg has increased since the second half of the last century, probably due to higher metal inputs from both fossil fuel burning and sewage effluents. The more recent increase of iron, chromium, nickel, and cobalt is possibly related to the dumping of acid iron waste from titanium oxide production.
    Type: Article , PeerReviewed
    Format: text
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    PAPER (OCEANREP)
  • 7
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    Thorium and uranium isotope analyses on "Meteor" core 12310, NW African Continental Rise (1978)
    Bornträger
    Details
    Publication Date: 2022-07-25
    Description: The Th content of the sediment samples from "Meteor" core 12310 (3080 m water depth, off NW Africa) on a carbonate-free basis lies around the average of 12.4 ppm and is similar to the average content of the earth crust. On the contrary, uranium was found to be up to 3.5-fold enriched in the core section between 60 and 330 cm (within the Würm Glacial) where reducing conditions occur, due to deposition of authigenic uranium (9 µg/cm2 1000 yrs.). The authigenic uranium content is correlated to the organic matter content (U/Corg ratio = 6 · 10-4). On the basis of the uranium content of the oxidized section uranium was split into a detritic and an authigenic component and the amount of supported ionium was calculated. From the profile of the specific I0.excess act1v1ty Io-total - Io-supported) with depth, average sedimentation rates of 3.3 ± 0.6 cm/1000 yrs. for the warmer stages and of 5 ± 1 cm/1000 yrs. for the cooler periods were estimated.
    Type: Article , PeerReviewed
    Format: text
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  • 8
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    Th230-excess EDTA extraction : a modification of the ionium method for high accumulation rate determination (1978)
    Bornträger
    Details
    Publication Date: 2022-07-25
    Description: A rapid procedure for Io (Th230) dating of sediments with accumulation rates in the range of several cm/1000 years is described. Studying of large sample populations with very small Io-excess activity is possible as the counting time (around 1500 min/sample) are 2 to 5 times shorter than with the standard Io-excess method. Improved sensitivity of the Io-excess measurement is achieved by: 1) extraction (~90%) of the authigenic Io-excess with EDTA, with minor leaching (~30%) of the allogenic Th232 and Io-supported, 2) processing samples as large as 10 g or more. The procedure was applied to sediments from the Caribbean (V 12-122) and from the Ionian Sea (22M48 and 17M17). In the case of the standard core V 12-122 our results are in good agreement with previous time-consuming Io determinations. The resulting average accumulation rates of 2.0 ± 0.3 cm/1000 years for the Ionian Sea cores are close to the average derived from magnetic reversal studies of a nearby core.
    Type: Article , PeerReviewed
    Format: text
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    PAPER (OCEANREP)
  • 9
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    Untersuchungen zur Chronostratigraphie mariner Terrassen in Mittelitalien—230Th/234U- und ESR-Datierungen an fossilen Mollusken (2011)
    Geozon Science Media
    Details
    Publication Date: 2021-03-29
    Description: Durch die ESR-Altersbestimmungsmethode (Elektronenspin Resonanz) sowie die 230Th/234U-Datierung fossiler Muscheln bei Tarquinia (Latium) konnte die stratigraphische Einordnung tektonisch verstellter thyrrenzeitlicher mariner Terrassen geklärt werden. Zwischen den Flüssen Mignone und Marta liegt die Terrasse des Euthyrren I (100 000—120 000 BP) heute in einer Höhe von 40—45 m ü. M. und die Küstenlinie des Euthyrren II (200 000—220 000 BP) ca. 65m ü. M. Sie liegen damit deutlich höher als alle bisher gefundenen euthyrrenzeitlichen Terrassen in Mittelitalien.
    Description: research
    Keywords: 551.7 ; VAR 000 ; Glazialgeologie ; pleistocene ; pléistocène ; shoreline ; chronostratigraphy ; marine terrace ; sampling ; electron spin resonance ; th 230-u234-isotop ; beachrock ; epeirogeny ; bivales ; fossilerous localities ; latium ; mignoe marta region
    Language: German
    Type: article , publishedVersion
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    CITATION GEO-LEO
  • 10
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    Main metals composition (wt % of dried substance) for manganese crusts retrieved in the Pacific Ocean during the SO-18 (MIDPAC 1) campaign (2023)
    PANGAEA
    Details
    Publication Date: 2023-08-28
    Description: Manganese crust samples were dredged from the Line Islands Ridge and the MidPacific Mountains that were recently taken during the R/V Sonne SO18 (Midpac 81) cruise. The metal composition of the outermost millimetre of the crusts where growth rates were determined is given in Table 1. The concentrations were measured on dried substance. Mn, Fe were determined by potentiometric and complexometric titration methods; Ni, Cu, Co were analysed using differential pulse polarography. All analytical data are results of repeated determinations having 〈1% of relative error for main constituents (Mn, Fe), and 〈5% of relative error for minor constituents (Ni, Co, Cu).
    Keywords: Cobalt; Copper; Deposit type; DEPTH, sediment/rock; Differential pulse polarography; Dredge; DRG; Elevation of event; Event label; Geochemistry; Identification; Iron; Latitude of event; Longitude of event; Manganese; manganese micronodule; manganese nodule; MIDPAC I; Nickel; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; North Pacific Ocean; ocean; Pacific Oean; Potentiometric and complexometric titriation; sediment; SO18; SO18_111; SO18_32; SO18_57; SO18_73; SO18_76; Sonne
    Type: Dataset
    Format: text/tab-separated-values, 35 data points
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    DATA PANGAEA
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