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  • Wiley-Blackwell  (1.745)
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  • American Meteorological Society (AMS)
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  • 1
    ISSN: 1059-910X
    Schlagwort(e): STEM ; PEELS ; HAADFI ; Nanolithography ; Super-resolution ; STM ; Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Allgemeine Naturwissenschaft
    Notizen: The Microstructural Physics group at the Cavendish Laboratory is actively involved in a considerable number of research projects which cover a broad range of materials science. In this paper, we describe briefly several such projects, with particular emphasis given to the application of parallel-detection electron energy loss spectroscopy (PEELS) on a scanning transmission electron microscope (STEM) to the analysis of materials such as stainless steels, catalysts, and high temperature superconductors. In addition, we describe a number of related projects that are currently being carried out in the group, particularly those which utilise and develop novel STEM imaging and analytical techniques. © 1993 Wiley-Liss, Inc.
    Zusätzliches Material: 19 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
  • 3
  • 4
    Digitale Medien
    Digitale Medien
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 24 (1990), S. 547-571 
    ISSN: 0021-9304
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin , Technik allgemein
    Notizen: Previously observed bioactivity of poly(dimethylsiloxane)-poly(ethyelene oxide)-heparin (PDMS-PEO-Hep) triblock copolymers has prompted studies of the surface and bulk character of this copolymer using angular-dependent electron spectroscopy for chemical analysis (ADESCA), static secondary mass spectroscopy (SIMS), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). Because the low-energy PDMS phase dominates surfaces of this copolymer when solvent cast under air or vacuum conditions, attempts were made to explain surface restructuring and rearrangements induced in hydrated or aqueous environments that permit surface accessibility and bioactivity of heparin moieties. Based on comparisons with PDMS, PEO, and heparin homopolymers, PEO/heparin blends, and an unheparinized PDMS-PEO diblock copolymer, PDMS-PEO-heparin demonstrates both phase-mixed and phase-separated regions in DSC analysis. During annealing cycles above the Tg values of the copolymer constituents, phase-mixed regions become increasingly phase separated and PEO enriched. TGA analysis confirmed the presence of block copolymer constituents and presented evidence of intermolecular segmental interactions, hence phase-mixing in the copolymers. ADESCA analysis indicates that the outer 5 Å of both the PDMS-PEO and PDMS-PEO-Hep copolymers is essentially pure PDMS. However, significant amounts of PEO are detected 5 to 20 Å below the surface. Static SIMS also detects the presence of PDMS at the surfaces of the PDMS-PEO and PDMS-PEO-Hep copolymers. Compositional models based on ADESCA, SIMS, and DSC data are presented for desiccated and hydrated copolymer surfaces.
    Zusätzliches Material: 16 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    facet.materialart.
    Unbekannt
    PANGAEA
    In:  Supplement to: Corrigan, Jeffrey D; Crowley, Kevin D (1990): Fission-track analysis of detrital apatites from Sites 717 and 718, Leg 116, central Indian Ocean. In: Cochran, JR; Stow, DAV; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 116, 75-92, https://doi.org/10.2973/odp.proc.sr.116.118.1990
    Publikationsdatum: 2024-01-09
    Beschreibung: This paper presents fission-track ages and confined track-length measurements from detrital apatites recovered from Ocean Drilling Program Leg 116 Site 717 and 718 cores. We interpret these data in terms of the post-depositional thermal history at these two sites and the thermotectonic history of apatite source areas. Composite apatite samples were derived by combining fine-grained sand samples from Sites 717 and 718 cores over 70- to 120-m intervals over the total depth penetrated at Sites 717 (T.D. = 820 mbsf) and 718 (T.D. = 960 mbsf). Thirty apatite grains per composite sample from ten samples (at least every other sampled interval) were dated and track-length measurements (20-50 per sample) were obtained for all samples. Mean track lengths from Site 717 samples are statistically identical, ranging from 14.4 ± 0.4 to 14.8 ± 0.3 ?m (all errors are the 95% confidence interval), and mean fission-track ages increase monotonically downhole from 4.8 ± 1.1 to 14.3 ± 2.3 Ma. For Site 718, located approximately 7 km to the south of Site 717 on an adjacent fault block, mean track lengths to 560 mbsf are equivalent to those measured from Site 717 samples. A decrease in mean track length (14.6 ± 0.3 to 13.2 ± 0.4 µm) and a corresponding decrease in mean fission-track age (21.1 ± 2.9 to 15.8 ± 2.4 Ma) with depth for samples between 560 and 960 mbsf from Site 718 indicates that post-depositional downhole shortening of fission tracks at elevated temperatures has taken place. Track-length shortening, based on mean track lengths relative to an unannealed mean track length of 16.3 µm, is approximately 10% for all Site 717 samples and for samples from the upper 560 m of Site 718. The total amount of shortening of the lowermost sample from Site 718 is approximately 20%. Based on extrapolation of published laboratory annealing experiments, maximum isothermal time-temperature condition extremes that could produce this degree of annealing at the base of Site 718 are estimated to range from 50°C for a duration of 17 m.y. (since deposition) to 55°C for a duration of 7.5 m.y. (since the onset of deformation). These estimates argue against regional thermal conduction as the only mechanism for post-depositional heating and support seafloor heat flow and shipboard geochemical evidence for local convective heat transfer in the vicinity of Site 718. In terms of source-area implications, dated samples have mean apatite fission-track ages that are only 0 to 10 m.y. older than depositional ages. These young ages imply rapid transport of sediment to the distal Bengal Fan and source areas characterized by high denundation rates (〈300 m/m.y.). These rates suggest that source areas similar to parts of the present-day Himalayas supplied sediment to the distal Bengal Fan since at least 17 Ma.
    Schlagwort(e): 116-717; 116-717B; 116-717C; 116-718; 116-718C; 116-718E; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg116; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean
    Materialart: Dataset
    Format: application/zip, 3 datasets
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    facet.materialart.
    Unbekannt
    PANGAEA
    In:  Supplement to: Herbert, Timothy D; d'Hondt, Steven L (1990): Precessional climate cyclicity in Late Cretaceous-Early Tertiary marine sediments: a high resolution chronometer of Cretaceous-Tertiary boundary events. Earth and Planetary Science Letters, 99(3), 263-275, https://doi.org/10.1016/0012-821X(90)90115-E
    Publikationsdatum: 2024-01-06
    Beschreibung: We report well-dated Late Cretaceous and Early Tertiary precessional climatic cycles, recorded by rhythmic carbonate maxima and minima in South Atlantic deep sea sites. Spectral analyses of digitized sediment color, a suitable carbonate proxy, show prominent regularities in the spacing marl-carbonate beds. Magnetostratigraphic dating over a number of magnetic chrons constrains the duration of the cycles, which can be detected over at least 20 Myr of sedimentation at 7 coring locations. Their mean absolute period of 23.5 +/- 4.4kyr agrees closely with the predicted late Cretaceous precessional period of 20.8 kyr. Because they can be matched to a physical forcing mechanism with a known repeat time, the cycles offer a new high-resolution tool to measure rates of climate change before and after the Cretaceous-Tertiary (K/T) boundary. From counts of carbonate cycles, we derive the position of the K/T boundary within C29R at 350 kyr after the base of the reversal. The constancy of cycle thickness (linearly related to sedimentation rate) and amplitude up to the “boundary clay” does not give evidence for climate instability preceding the boundary. Orbital chronometry records a step-function decrease in sediment accumulation rate at the Cretaceous-Tertiary boundary that is consistent with a geologically instantaneous event.
    Schlagwort(e): 39-356; 39-357; 72-516F; 74-525A; 74-527; 74-528; 74-529; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg39; Leg72; Leg74; South Atlantic; South Atlantic/CONT RISE; South Atlantic/CREST; South Atlantic/PLATEAU; South Atlantic/RIDGE; South Atlantic/SLOPE
    Materialart: Dataset
    Format: application/zip, 7 datasets
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Publikationsdatum: 2024-01-06
    Schlagwort(e): 39-356; AGE; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Duration; Glomar Challenger; Leg39; Sample code/label; Sample code/label 2; South Atlantic/PLATEAU; Spacing
    Materialart: Dataset
    Format: text/tab-separated-values, 12 data points
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Publikationsdatum: 2024-01-06
    Schlagwort(e): 72-516F; AGE; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Duration; Glomar Challenger; Leg72; Sample code/label; Sample code/label 2; South Atlantic/CONT RISE; Spacing
    Materialart: Dataset
    Format: text/tab-separated-values, 77 data points
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Publikationsdatum: 2024-01-06
    Schlagwort(e): 39-357; AGE; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Duration; Glomar Challenger; Leg39; Sample code/label; South Atlantic/CONT RISE; Spacing
    Materialart: Dataset
    Format: text/tab-separated-values, 23 data points
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Publikationsdatum: 2024-01-06
    Schlagwort(e): 74-525A; AGE; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Duration; Glomar Challenger; Leg74; Sample code/label; Sample code/label 2; South Atlantic/CREST; Spacing
    Materialart: Dataset
    Format: text/tab-separated-values, 23 data points
    Standort Signatur Erwartet Verfügbarkeit
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