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  • Data  (4)
  • Other Sources  (184)
  • 2005-2009  (90)
  • 1995-1999  (92)
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  • 1
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    NAS Parallel Benchmark Results 11-96 (1997)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: The NAS Parallel Benchmarks have been developed at NASA Ames Research Center to study the performance of parallel supercomputers. The eight benchmark problems are specified in a "pencil and paper" fashion. In other words, the complete details of the problem to be solved are given in a technical document, and except for a few restrictions, benchmarkers are free to select the language constructs and implementation techniques best suited for a particular system. These results represent the best results that have been reported to us by the vendors for the specific 3 systems listed. In this report, we present new NPB (Version 1.0) performance results for the following systems: DEC Alpha Server 8400 5/440, Fujitsu VPP Series (VX, VPP300, and VPP700), HP/Convex Exemplar SPP2000, IBM RS/6000 SP P2SC node (120 MHz), NEC SX-4/32, SGI/CRAY T3E, SGI Origin200, and SGI Origin2000. We also report High Performance Fortran (HPF) based NPB results for IBM SP2 Wide Nodes, HP/Convex Exemplar SPP2000, and SGI/CRAY T3D. These results have been submitted by Applied Parallel Research (APR) and Portland Group Inc. (PGI). We also present sustained performance per dollar for Class B LU, SP and BT benchmarks.
    Keywords: Computer Systems
    Type: NAS-96-18
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Pigment data set from the SeaWiFS Bio-optical Archive and Storage System (1961-1996) (2008)
    PANGAEA
    In:  National Aeronautics and Space Administration
    Details
    Publication Date: 2023-02-22
    Description: The oceans play a critical role in the Earth's climate, but unfortunately, the extent of this role is only partially understood. One major obstacle is the difficulty associated with making high-quality, globally distributed observations, a feat that is nearly impossible using only ships and other ocean-based platforms. The data collected by satellite-borne ocean color instruments, however, provide environmental scientists a synoptic look at the productivity and variability of the Earth's oceans and atmosphere, respectively, on high-resolution temporal and spatial scales. Three such instruments, the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) onboard ORBIMAGE's OrbView-2 satellite, and two Moderate Resolution Imaging Spectroradiometers (MODIS) onboard the National Aeronautic and Space Administration's (NASA) Terra and Aqua satellites, have been in continuous operation since September 1997, February 2000, and June 2002, respectively. To facilitate the assembly of a suitably accurate data set for climate research, members of the NASA Sensor Intercomparison and Merger for Biological and Interdisciplinary Oceanic Studies (SIMBIOS) Project and SeaWiFS Project Offices devote significant attention to the calibration and validation of these and other ocean color instruments. This article briefly presents results from the SIMBIOS and SeaWiFS Project Office's (SSPO) satellite ocean color validation activities and describes the SeaWiFS Bio-optical Archive and Storage System (SeaBASS), a state-of-the-art system for archiving, cataloging, and distributing the in situ data used in these activities.
    Keywords: Chlorophyll a; DATE/TIME; DEPTH, water; Fluorometry; High Performance Liquid Chromatography (HPLC); LATITUDE; LONGITUDE; Phaeopigments; Pigments, total; Sample comment; SeaBASS; Time zone
    Type: Dataset
    Format: text/tab-separated-values, 733207 data points
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    DATA PANGAEA
  • 3
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    Pliocene records of marine- 87Sr/86Sr ratios from Sicily and the eastern Indian Ocean (2006)
    PANGAEA
    In:  Supplement to: McArthur, J M; Rio, Domenico; Massari, F; Castradori, Davide; Bailey, Trevor R; Thirlwall, Matthew F; Houghton, Simon D (2006): A revised Pliocene record for marine-87Sr/86Sr used to date an interglacial event recorded in the Cockburn Island Formation, Antarctic Peninsula. Palaeogeography, Palaeoclimatology, Palaeoecology, 242(1-2), 126-136, https://doi.org/10.1016/j.palaeo.2006.06.004
    Details
    Publication Date: 2024-01-09
    Description: We present a revised 87Sr/86Sr-curve for marine-Sr in the interval 2.5-4.5 Ma using analysis of Orbulina universa from the Middle Pliocene type section in Sicily (Punta Piccola section) and a mixed assemblage of planktonic foraminifera from ODP Site 758A and B. The new calibration is used, together with new 87Sr/86Sr analysis of pectenid calcite from Cockburn Island, Antarctica, to confirm an age of 4.7 Ma for the pectenids of the Cockburn Island Formation (formerly the Pecten Conglomerate), a unit important in marking a period of warmth and possible glacial retreat in Antarctica. Finally, to aid interlaboratory comparison of 87Sr/86Sr data, we calibrate a value of 0.709174 for EN-1 against a value of NIST 987 of 0.709248.
    Keywords: 121-758; Capo_Rossello; COMPCORE; Composite Core; Indian Ocean; Italy; Joides Resolution; Leg121; Ocean Drilling Program; ODP; OUTCROP; Outcrop sample
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 4
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    d11B and metal/Ca ratios versus size fractions in the Surface and deep dwelling species, ODP Holes 130-806B and 108-664C (2007)
    PANGAEA
    In:  Supplement to: Ni, Yunyan; Foster, Gavin L; Bailey, Trevor R; Elliott, Tim; Schmidt, Daniela N; Pearson, Paul N; Haley, Brian A; Coath, Chris (2007): A core top assessment of proxies for the ocean carbonate system in surface-dwelling foraminifers. Paleoceanography, 22(3), PA3212, https://doi.org/10.1029/2006PA001337
    Details
    Publication Date: 2024-01-09
    Description: We have assessed the reliability of several foraminifer-hosted proxies of the ocean carbonate system (d11B, B/Ca, and U/Ca) using Holocene samples from the Atlantic and Pacific oceans. We examined chemical variability over a range of test sizes for two surface-dwelling foraminifers (Globigerinoides sacculifer and Globigerinoides ruber). Measurements of d11B in G. ruber show no significant relationship with test size in either Atlantic or Pacific sites and appear to provide a robust proxy of surface seawater pH. Likewise there is no significant variability in the d11B of our Atlantic core top G. sacculifer, but we find that d11B increases with increasing test size for G. sacculifer in the Pacific. These systematic differences in d11B are inferred to be a consequence of isotopically light gametogenic calcite in G. sacculifer and its preferential preservation during postdepositional dissolution. The trace element ratio proxies of ocean carbonate equilibria, U/Ca and B/Ca, show systematic increases in both G. ruber and G. sacculifer with increasing test size, possibly as a result of changing growth rates. This behavior complicates their use in paleoceanographic reconstructions. In keeping with several previous studies we find that Mg/Ca ratios increase with increasing size fraction in our well-preserved Atlantic G. sacculifer but not in G. ruber. In contrast to previous interpretations we suggest that these observations reflect a proportionally larger influence of compositionally distinct gametogenic calcite in small individuals compared to larger ones. As with d11B this influences G. sacculifer but not G. ruber, which has negligible gametogenic calcite.
    Keywords: 108-664C; 130-806B; Aluminium/Calcium ratio; Barium/Calcium ratio; Boron/Calcium ratio; Cadmium/Calcium ratio; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Joides Resolution; Leg108; Leg130; Lithium/Calcium ratio; Magnesium/Calcium ratio; Manganese/Calcium ratio; Negative-thermal ionization mass spectrometry (N-TIMS); Neodymium/Calcium ratio; North Pacific Ocean; Ocean Drilling Program; ODP; PC; Piston corer; RC14; RC14-37; Replicates; Robert Conrad; Sample code/label; Size fraction; Sodium/Calcium ratio; South Atlantic Ocean; Species; Strontium/Calcium ratio; Uranium/Calcium ratio; δ11B; δ11B, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 494 data points
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    DATA PANGAEA
  • 5
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    (Table 1) A Pliocene 87Sr/86Sr record of Orbulina universa of ODP Site 121-758 in the eastern Indian Ocean (2006)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 121-758; AGE; COMPCORE; Composite Core; DSDP/ODP/IODP sample designation; Indian Ocean; Ion-exchange-chromatography; Joides Resolution; Leg121; Ocean Drilling Program; ODP; Sample code/label; Strontium-87/Strontium-86 ratio
    Type: Dataset
    Format: text/tab-separated-values, 36 data points
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    DATA PANGAEA
  • 6
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    Large time step numerical modelling of the flow of Maxwell materials (2006)
    In:  Geophys. J. Int., Washington D.C., Bundesanstalt für Geowissenschaften und Rohstoffe, vol. 164, no. 2, pp. 460-466, pp. 2122
    Details
    Publication Date: 2006
    Keywords: Modelling ; Rheology ; Inelastic ; GJI ; tectonic ; modelling, ; viscoelastic
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    BIBLIOGRAPHY SEISMOLOGY
  • 7
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    Fault relays, bends and branch-lines (1999)
    In:  Journal of Structural Geology, Washington, D.C., AGU, vol. 21, no. 8-9, pp. 1019-1026, pp. B12406, (ISSN: 1340-4202)
    Details
    Publication Date: 1999
    Keywords: Structural geology ; Review article ; Fault zone ; Fracture ; JSG
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    BIBLIOGRAPHY SEISMOLOGY
  • 8
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    Exercise thermoregulation after 6 h of chair rest, 6 degrees head-down bed-rest, and water immersion deconditioning in men (1996)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The purpose was to investigate the mechanism for the excessive exercise hyperthermia following deconditioning (reduction of physical fitness). Rectal (Tre) and mean skin (Tsk) temperatures and thermoregulatory responses were measured in six men [mean (SD) age, 32 (6) years; mass, 78.26 (5.80) kg; surface area, 1.95 (0.11) m2; maximum oxygen uptake (VO2max), 48 (6) ml.min-1.kg-1; whilst supine in air at dry bulb temperature 23.2 (0.6) degree C, relative humidity 31.1 (11.1)% and air speed 5.6 (0.1) m.min-1] during 70 min of leg cycle exercise [51 (4)% VO2max] in ambulatory control (AC), or following 6 h of chair rest (CR), 6 degree head-down bed rest (BR), and 20 degree (WI20) and 80 degree (WI80) foot-down water immersion [water temperature, 35.0 (0.1) degree C]. Compared with the AC exercise delta Tre [mean (SD) 0.77 (0.13) degree C (*P 〈 0.05), after WI80 0.96 (0.13) degree C*, and after WI20 1.03 (0.09) degree C*. All Tsk responded similarly to exercise: they decreased (NS) by 0.5-0.7 degree C in minutes 4-8 and equilibrated at +0.1 to +0.5 degree C at 60-70. Skin heat conductance was not different among the five conditions (range = 147-159 kJ.m-2.h-1.degree C-1). Results from an intercorrelation matrix suggested that total body sweat rate was more closely related to Tre at 70 min (Tre70) than limb sweat rate or blood flow. Only 36% of the variability in Tre70 could be accounted for by total sweating, and less than 10% from total body dehydration. It would appear that multiple factors are involved which may include change in sensitivity of thermo- and osmoreceptors.
    Keywords: Aerospace Medicine
    Type: European journal of applied physiology and occupational physiology (ISSN 0301-5548); Volume 72; 4; 303-9
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  • 9
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    Isokinetic and isometric strength-endurance after 6 hours of immersion and 6 degrees head-down tilt in men (1996)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: PURPOSE: To determine weight (water) loss levels for onset of muscular strength and endurance changes during deconditioning. METHODS: Seven men (27-40 yr) performed maximal shoulder-, knee-, and ankle-joint isometric (0 degree.s(-1) load) and isokinetic (60 degrees, 120 degrees, 180 degrees.s(-1) velocity) exercise tests during ambulatory control (AC), after 6 h of 6 degrees head-down tilt (HDT; dry-bulb temp. = 23.2 +/- SD 0.6 degrees C, relative humidity = 31.1+/- 11.1%) and after 6 h of 80 degrees foot-down head-out water immersion (WI; water temp. = 35.0 +/- SD 0.1 degree C) treatments. RESULTS: Weight (water) loss after HDT (1.10 +/- SE 0.14 kg, 1.4 +/- 0.2% body wt) and WI (1.54+/- 0.19 kg, 2.0 +/- 0.2% body wt) were not different, but urinary excretion with WI (1,354 +/- 142 ml.6 h(-1)) was 28% greater (p 〈 0.05) than that of 975 +/- 139 ml.6 h(-1) with HDT. Muscular endurance (total work; maximal flexion-extension of the non-dominant knee at 180 degrees.s(-1) for 30 s) was not different between AC and the WI or HDT treatments. Shoulder-, knee-, and ankle-joint strength was unchanged except for three knee-joint peak torques: AC torque (120 degrees.s(-1), 285 +/- 20 Nm) decreased to 268 +/- 21 Nm (delta = -6%, p 〈 0.05) with WI; and AC torques (180 degrees.s(-1), 260 +/- 19 Nm) decreased to 236 +/- 15 Nm (delta = -9%, p 〈 0.01) with HDT, and to 235 +/- 19 Nm (delta = -10%, p 〈 0.01) with WI. CONCLUSION: Thus, the total body hypohydration threshold level for shoulder- and ankle-joint strength and endurance decrements is more than 2% body weight (water) loss, while significant reduction in knee-joint muscular strength-endurance occurred only at moderate (120 degrees.s(-1) and lighter (180 degrees.s(-1)) loads with body weight loss of 1.4-2.0% following WI or HDT, respectively. These weight (water) losses and knee-joint strength decrements are somewhat less than the mean weight loss of 2.6% and knee-joint strength decrements of 6-20% of American astronauts after Skylab flights to 84 d.
    Keywords: Aerospace Medicine
    Type: Aviation, space, and environmental medicine (ISSN 0095-6562); Volume 67; 1; 46-51
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    NASA TECHNICAL REPORTS
  • 10
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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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