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  • 1
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    Volcanic ash analyses in sediments of ODP Leg 201 sites (2006)
    PANGAEA
    In:  Supplement to: Hart, D; Miller, D Jay (2006): Analysis and correlation of volcanic ash in marine sediments from the Peru margin, Ocean Drilling Program Leg 201: explosive volcanic cycles of the north-central Andes. In Jørgensen, BB; D'Hondt, SL; Miller, DJ (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 201, 1-43, https://doi.org/10.2973/odp.proc.sr.201.122.2006
    Details
    Publication Date: 2024-01-09
    Description: Although land studies have identified major volcanic centers of historic eruptions within the Central Andes, the tephrachronologic record is disturbed by the high erosion rates in this arid region. Owing to erosion, studies of volcanic cyclicity based on subaerial deposits offer an incomplete record of the frequency and episodicity of eruptions since the Miocene. However, volcanic material commonly occurs in marine sediment as discrete ash fall layers and/or disseminated ash accumulations. A detailed investigation of cores from three sites offshore Peru drilled during Ocean Drilling Program (ODP) Leg 201 has been conducted to determine the occurrence of volcanic ash layers and ash accumulations within marine sediments along the Peru shelf. These sites were previously occupied during ODP Leg 112, which suffered from poor and/or disturbed core recovery. Advancements in hydraulic piston coring realized since and employed during Leg 201 resulted in better core recovery and less disturbance of sediment throughout the cored intervals. Because marine sediments potentially undergo less erosion than land deposits and because Leg 201 benefited from improved recovery of less disturbed cores, the tephrachronologic record from Leg 201 yielded a more complete record of explosive activity for north-central Andean volcanism than previous studies. Ash layers were identified through detailed core descriptions supplemented by smear slide analysis. Primary ash layers were confirmed through whole-rock and glass geochemistry and petrographic analyses. These data also provided information concerning volcanic episodes represented by the ash layers through correlation to land studies. In addition, correlative ties between drilling sites are suggested. The improved recovery enabled the detailed examination of cores from the Peru margin needed to test the hypothesis that volcanic ash layers and accumulations are more abundant in the study region than previously reported.
    Keywords: 201-1227A; 201-1228A; 201-1229A; 201-1229C; 201-1229E; DRILL; Drilling/drill rig; Joides Resolution; Leg201; Ocean Drilling Program; ODP; South Pacific Ocean
    Type: Dataset
    Format: application/zip, 4 datasets
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    DATA PANGAEA
  • 2
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    (Table T4) Type 2, Type 3 and Type 4 ash layers of ODP Leg 201 sites (2006)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 201-1227A; 201-1228A; 201-1229A; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Epoch; Event label; Joides Resolution; Layer description; Leg201; Ocean Drilling Program; ODP; Sample code/label; Sample comment; South Pacific Ocean
    Type: Dataset
    Format: text/tab-separated-values, 614 data points
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  • 3
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    (Table T3) Ash layer description of ODP Leg 201 sites (2006)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 201-1227A; 201-1228A; 201-1229A; Biogenic; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Epoch; Event label; Joides Resolution; Layer thickness; Leg201; Lithology/composition/facies; Measured; Ocean Drilling Program; ODP; Pumice; Quartz; Sample code/label; Sample comment; South Pacific Ocean; Visual description
    Type: Dataset
    Format: text/tab-separated-values, 550 data points
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  • 4
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    (Table T5) Average glass analyses of ODP Leg 201 sites (2006)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 201-1227A; 201-1228A; 201-1229A; Aluminium oxide; Calcium oxide; CAMECA electron microprobe; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Elements, total; Event label; Iron oxide, FeO; Joides Resolution; Leg201; Magnesium oxide; Manganese oxide; Ocean Drilling Program; ODP; Phosphorus pentoxide; Potassium oxide; Sample code/label; Silicon dioxide; Sodium oxide; South Pacific Ocean; Sulfur, total; Titanium dioxide
    Type: Dataset
    Format: text/tab-separated-values, 182 data points
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  • 5
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    (Table T6) Whole rock geochemical analyses of ODP Leg 201 Type 1 ash layers (2006)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 201-1227A; 201-1228A; 201-1229A; 201-1229C; 201-1229E; Aluminium oxide; Barium; Calcium oxide; Cerium; Cobalt; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Dysprosium; Elements, total; Erbium; Europium; Event label; Gadolinium; ICP, Inductively coupled plasma; Iron oxide, Fe2O3; Joides Resolution; Lanthanum; Leg201; Loss on ignition; Magnesium oxide; Manganese oxide; Neodymium; Nickel; Niobium; Ocean Drilling Program; ODP; Phosphorus pentoxide; Potassium oxide; Rubidium; Sample code/label; Sample comment; Scandium; Silicon dioxide; Sodium oxide; South Pacific Ocean; Strontium; Thorium; Titanium dioxide; Vanadium; Ytterbium; Yttrium; Zirconium
    Type: Dataset
    Format: text/tab-separated-values, 1837 data points
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  • 6
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    Seawater carbonate chemistry and growth of Atlantic surfclam (Spisula solidissima) in laboratory experiments (2022)
    PANGAEA
    Details
    Publication Date: 2024-03-15
    Description: A dynamic energy budget (DEB) model integrating pCO2 was used to describe ocean acidification (OA) effects on Atlantic surfclam, Spisula solidissima, bioenergetics. Effects of elevated pCO2 on ingestion and somatic maintenance costs were simulated, validated, and adapted in the DEB model based upon growth and biological rates acquired during a 12-week laboratory experiment. Temperature and pCO2 were projected for the next 100 years following the intergovernmental panel on climate change representative concentration pathways scenarios (2.6, 6.0, and 8.5) and used as forcing variables to project surfclam growth and reproduction. End-of-century water warming and acidification conditions resulted in simulated faster growth for young surfclams and more energy allocated to reproduction until the beginning of the 22nd century when a reduction in maximum shell length and energy allocated to reproduction was observed for the RCP 8.5 scenario.
    Keywords: Alkalinity, total; Animalia; Aragonite saturation state; Benthic animals; Benthos; Bicarbonate ion; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Coast and continental shelf; Containers and aquaria (20-1000 L or 〈 1 m**2); Experiment day; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Height; Laboratory experiment; Length; Mollusca; North Atlantic; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; Replicate; Salinity; Shell, dry mass; Single species; Species, unique identification; Species, unique identification (Semantic URI); Species, unique identification (URI); Spisula solidissima; Temperate; Temperature, water; Tissue, dry mass; Type; Width
    Type: Dataset
    Format: text/tab-separated-values, 15872 data points
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  • 7
    Electronic Resource
    Electronic Resource
    Low-temperature photochromic response of gallium-doped bismuth germanium oxide (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 3974-3978 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Gallium is one of several dopants that electronically compensate the deep donor responsible for the yellow coloration observed in bismuth germanium oxide (BGO). A series of Ga-doped BGO crystals were grown using the Czochralski method to confirm the formation of a trapped hole center following exposure to near band edge light at low temperatures. The deep donor absorption shoulder disappeared for Ga concentrations in the 3%–4% (melt) range. Excitation at 10 K with 3.3 eV light produces photochromic absorption bands. For low gallium concentrations the photochromic bands were the same as the ones observed in undoped BGO. For concentrations of 4% or more the photoinduced absorption consisted of overlapping bands at 1.1, 1.55, and 2.45 eV. These bands grew uniformly with exposure time and annealed together in the 100–120 K temperature range. By comparison with earlier results on Al-doped BGO and bismuth silicon oxide (BSO), we believe that the 1.1 eV band in BGO:Ga and the 1.0 eV band in BGO:Al (and BSO:Al) are due to trapped hole centers ([GaO4]0 and [AlO4]0, respectively).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352862
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  • 8
    Electronic Resource
    Electronic Resource
    The low-temperature photochromic response of bismuth silicon oxide (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 1443-1448 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Exposing the photorefractive material bismuth silicon oxide (BSO) at low temperatures to 2.4–3.3 eV light produces photochromic absorption bands. In undoped and Fe-doped BSO these bands appear to consist of a series of overlapping bands ranging from around 1.5 eV in the infrared to near the band edge. The infrared component is always weaker than the visible range contributions. The infrared portion anneals just above 100 K; in some samples this anneal is accompanied by the appearance of additional structure in the visible region. In undoped BSO the major anneal of the photochromic bands takes place above 200 K. If iron is present the photochromic bands are weaker and an anneal stage in the 120–150 K range appears. Bleaching with either 1.51 or 2.28 eV laser light uniformly lowered the photochromic bands in both undoped and Fe-doped BSO. In BSO:Al the aluminum electronically compensates the deep donor centers responsible for the yellow coloration observed in undoped crystals. At low temperatures, photoexcitation using near band-edge light produces the same overlapping bands at 1, 1.38, and 2.45 eV that were observed in BGO:Al. These bands anneal together between 80 and 100 K. The [AlO4]0 center which causes the coloration observed in smoky quartz is a plausible model for the photochromic bands in BSO:Al.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353243
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  • 9
    Electronic Resource
    Electronic Resource
    Clear correlations observed between YBa2Cu3O7−δ thin-film properties and GHz microwave resonator performance (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 1789-1791 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have fabricated and measured 5 GHz microstrip resonators from a series of YBa2Cu3O7−δ thin films grown on LaAlO3(001) substrates by in situ laser ablation. We have studied the correlations between unloaded quality factor and various film properties, such as transition temperature, width of transition, critical current density, narrowness of x-ray rocking curve, sharpness of electron channeling pattern, and most important substrate temperature during growth. We found that in general, higher transition temperature, higher critical current density, sharper transition, sharper channeling pattern, and narrower x-ray rocking curve correlate positively with good microwave performance. The best quality factor exists for a narrow growth temperature window (around 800 °C). We also report the dependence of quality factor on device power for each film.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105092
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  • 10
    Electronic Resource
    Electronic Resource
    Lattice recovery of oxygen-implanted YBa2Cu3O7−δ superconductor (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 189-191 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The regrowth of an oxygen-implanted YBa2Cu3O7−δ thin film was studied by Rutherford backscattering, ion channeling, and x-ray diffraction studies. The atomic composition of the thin film was preserved even after a 1 h anneal at 990 °C, reflecting the high chemical stability of the material obtained by the pulsed laser deposition technique. Two distinct activation energies were determined during the regrowth process: 0.42±0.04 eV at lower temperatures, corresponding to epitaxial growth from the interface, and 0.18±0.03 eV at higher temperatures, presumably associated with homogeneous nucleation and reorientation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104214
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