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  • 2005-2009  (50)
  • 1995-1999  (58)
  • 1
    Keywords: Malm ; Zentrale Nordsee ; Geology ; Hydrocarbons ; North Sea
    Description / Table of Contents: J. J. Veldkamp, M. G. Gaillard, H. A. Jonkers, B. K. Levell, M. G. Gaillard, and H. A. Jonkers: A Kimmeridgian time-slice through the Humber Group of the central North Sea: a test of sequence stratigraphic methods / Geological Society, London, Special Publications, 114:1-28, doi:10.1144/GSL.SP.1996.114.01.01 --- Alan Carruthers, Tom Mckie, John Price, Robin Dyer, Gwydion Williams, and Paul Watson: The application of sequence stratigraphy to the understanding of Late Jurassic turbidite plays in the Central North Sea, UKCS / Geological Society, London, Special Publications, 114:29-45, doi:10.1144/GSL.SP.1996.114.01.02 --- M. J. David: History of hydrocarbon exploration in the Moray Firth / Geological Society, London, Special Publications, 114:47-80, doi:10.1144/GSL.SP.1996.114.01.03 --- Richard J. Davies, Kevin J. Stephen, John R. Underhill, Richard J. Davies, and Kevin J. Stephen: A re-evaluation of Middle and Upper Jurassic stratigraphy and the flooding history of the Moray Firth Rift System, North Sea / Geological Society, London, Special Publications, 114:81-108, doi:10.1144/GSL.SP.1996.114.01.04 --- S. D. Harker and M. Rieuf: Genetic stratigraphy and sandstone distribution of the Moray Firth Humber Group (Upper Jurassic) / Geological Society, London, Special Publications, 114:109-130, doi:10.1144/GSL.SP.1996.114.01.05 --- Claire R. Hallsworth, Andrew C. Morton, and Graham Dore: Contrasting mineralogy of Upper Jurassic sandstones in the Outer Moray Firth, North Sea: implications for the evolution of sediment dispersal patterns / Geological Society, London, Special Publications, 114:131-144, doi:10.1144/GSL.SP.1996.114.01.06 --- R. E. Frost and J. F. Rose: Tectonic quiescence punctuated by strike-slip movement: influences on Late Jurassic sedimentation in the Moray Firth and the North Sea region / Geological Society, London, Special Publications, 114:145-162, doi:10.1144/GSL.SP.1996.114.01.07 --- M. A. Martin, J. E. Pollard, and M. A. Martin: The role of trace fossil (ichnofabric) analysis in the development of depositional models for the Upper Jurassic Fulmar Formation of the Kittiwake Field (Quadrant 21 UKCS) / Geological Society, London, Special Publications, 114:163-183, doi:10.1144/GSL.SP.1996.114.01.08 --- Stuart Gowland: Facies characteristics and depositional models of highly bioturbated shallow marine siliciclastic strata: an example from the Fulmar Formation (Late Jurassic), UK Central Graben / Geological Society, London, Special Publications, 114:185-214, doi:10.1144/GSL.SP.1996.114.01.09 --- S. J. C. Cannon and S. Gowland: Facies controls on reservoir quality in the Late Jurassic Fulmar Formation, Quadrant 21, UKCS / Geological Society, London, Special Publications, 114:215-233, doi:10.1144/GSL.SP.1996.114.01.10 --- Geoff Freer, Andrew Hurst, and Paul Middleton: Upper Jurassic sandstone reservoir quality and distribution on the Fladen Ground Spur / Geological Society, London, Special Publications, 114:235-249, doi:10.1144/GSL.SP.1996.114.01.11 --- C. Y. McCants and S. D. Burley: Reservoir architecture and diagenesis in downthrown fault block plays: the Lowlander Prospect of Block 14/20b, Witch Ground Graben, Outer Moray Firth, UK North Sea / Geological Society, London, Special Publications, 114:251-285, doi:10.1144/GSL.SP.1996.114.01.12 --- Michael J. Pearson, Alasdair D. Duncan, and Alasdair D. Duncan: Biomarker maturity profiles in the Inner Moray Firth Basin and implications for inversion estimates / Geological Society, London, Special Publications, 114:287-298, doi:10.1144/GSL.SP.1996.114.01.13 --- B. Dickinson: The Puffin Field: the appraisal of a complex HP-HT gas-condensate accumulation / Geological Society, London, Special Publications, 114:299-327, doi:10.1144/GSL.SP.1996.114.01.14 --- Susan Currie: The development of the Ivanhoe, Rob Roy and Hamish Fields, Block 15/21A, UK North Sea / Geological Society, London, Special Publications, 114:329-341, doi:10.1144/GSL.SP.1996.114.01.15
    Pages: Online-Ressource (350 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 1897799705
    Language: English
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  • 2
    Publication Date: 1996-02-01
    Print ISSN: 0021-9584
    Electronic ISSN: 1938-1328
    Topics: Chemistry and Pharmacology , Education
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  • 3
    Publication Date: 1996-03-01
    Print ISSN: 0021-9584
    Electronic ISSN: 1938-1328
    Topics: Chemistry and Pharmacology , Education
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  • 4
    ISSN: 1365-2486
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Notes: This paper explores how the response of a temperate forest ecosystem to climate change might depend on species diversity and community change. In particular, we look at the dynamics of a model of temperate forest growth under doubled CO2. We combine a detailed, field-calibrated model of forest dynamics (Pacala et al 1993) with greenhouse data on the range of seedling biomass growth response to doubled CO2 concentrations (Bazzaz et al. 1990; Bazzaz & Miao 1993). Because total ecosystem response to climate change depends delicately on many environmental variables other than CO2, we isolate the effects of community change by comparing runs of the regular model, allowing dynamic community change, with runs of a reduced model that holds species composition static by using a single tree species with average parameters. Simulations that allowed community change instead of holding species composition constant showed a roughly 30% additional increase in total basal area over time scales of 50-150 years. Although the model omits many possible feedbacks and mechanisms associated with climate change, it suggests the large potential effects that species differences and feedbacks can have in ecosystem models and reinforces the possible importance of diversity to ecosystem function (Naeem et ai 1994; Tilman & Downing 1994) over time scales within the planning horizon for global change policy.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 3557-3559 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied the temporal variation of the visible photoluminescence from rapid thermally oxidized porous silicon prepared from n+ substrates. In contrast to the red (slow band) emission, which is observable immediately after high-temperature oxidation, the blue (fast band) emission is shown to become prevalent only after samples are stored in ambient air. The intensity of the blue emission increases with progressive aging, the magnitude of the increase being dependent on the temperature at which the material is oxidized. Thermal treatment of aged rapid thermally oxidized material can reduce and even quench the blue photoluminescence. Quenching is reversible in that the photoluminescence re-appears after further aging at room temperature. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 2764-2773 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Trends in the efficiency and small signal modulation behavior of porous silicon light emitting diodes (LEDs) are reported for devices formed by the anodization of bulk silicon p–n junctions. As the average size of the silicon skeleton is decreased, the external electroluminescence (EL) efficiency increases from 0.001% to 0.18% and there is a corresponding blue shift in the EL peak from 776 to 633 nm. An associated tenfold increase is observed in the photoluminescence efficiency while the diode resistance, at 2 V, increases from 3×103 to 1×106 Ω. Under small signal pulsed operation, the voltage dependence of the rising edge of the EL is well described by a carrier mobility of 3×10−4 cm2 s−1 V−1 which is independent of the average size of the luminescent regions of the silicon nanostructure. The falling edge of the EL transient is dominated by radiative recombination of quantum confined excitons. The modulation speed is found to be limited by a combination of carrier mobility in the silicon wires and radiative recombination processes. Evidence of charge trapping and discharge is found in an EL overshoot phenomenon. The major application of this type of porous silicon LED, with modulation speeds below 1 MHz, appears to be for displays integrated with circuitry rather than for optical interconnection.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 107-109 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Blue photoluminescence is observed, with nanosecond decay time, from rapid thermally oxidized porous silicon as a result of accelerated aging in plastic containers. Photoluminescence measurements, combined with chemical analyses of the "aged" porous silicon, indicate that the emission is a consequence of the incorporation of trace organic (hydrocarbon) contamination from the plastic containers as they outgas at a mildly elevated temperature (80 °C) and, albeit at a reduced rate, at room temperature. Such carbonaceous contaminants can subsequently be removed by high-temperature annealing, a process which also quenches the blue photoluminescence. Consequently, it is important to take into consideration the storage medium used when making comparative luminescent and compositional studies of porous silicon and, perhaps, porous materials in general. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [s.l.] : Macmillan Magazines Ltd.
    Nature 393 (1998), S. 443-445 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Silicon shows photo- and electroluminescence at visible wavelengths when chemically etched into a microporous network of ‘wires’ several nanometres thick. This raises the possibility of a silicon-based optoelectronic technology. The luminescence properties may be understood on the ...
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  • 9
    ISSN: 1546-1718
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Neurodegenerative disorders with high brain iron include Parkinson disease, Alzheimer disease and several childhood genetic disorders categorized as neuroaxonal dystrophies. We mapped a locus for infantile neuroaxonal dystrophy (INAD) and neurodegeneration with brain iron accumulation (NBIA) to ...
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  • 10
    ISSN: 1432-1939
    Keywords: Key words Carbohydrate reserves ; Root allocation ; Tree seedling survival
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We examined interspecific and intraspecific variation in tree seedling survival as a function of allocation to carbohydrate reserves and structural root biomass. We predicted that allocation to carbohydrate reserves would vary as a function of the phenology of shoot growth, because of a hypothesized tradeoff between aboveground growth and carbohydrate storage. Intraspecific variation in levels of carbohydrate reserves was induced through experimental defoliation of naturally occurring, 2-year-old seedlings of four northeastern tree species –Acer rubrum, A. saccharum, Quercus rubra, and Prunus serotina– with shoot growth strategies that ranged from highly determinate to indeterminate. Allocation to root structural biomass varied among species and as a function of light, but did not respond to the defoliation treatments. Allocation to carbohydrate reserves varied among species, and the two species with the most determinate shoot growth patterns had the highest total mass of carbohydrate reserves, but not the highest concentrations. Both the total mass and concentrations of carbohydrate reserves were significantly reduced by defoliation. Seedling survival during the year following the defoliation treatments did not vary among species, but did vary dramatically in response to defoliation. In general, there was an approximately linear relationship between carbohydrate reserves and subsequent survival, but no clear relationship between allocation to root structural biomass and subsequent survival. Because of the disproportionate amounts of reserves stored in roots, we would have erroneously concluded that allocation to roots was significantly and positively related to seedling survival if we had failed to distinguish between reserves and structural biomass in roots.
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