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  • Electronic Resource  (3)
  • 61.30.v  (1)
  • Ammonium  (1)
  • Arctic Amerasian shelf Sediment carbon and nitrogen isotopes  (1)
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  • Electronic Resource  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Transient grating optical nonlinearities in nematic, cholesteric and smectic liquid crystals (1995)
    Springer
    Applied physics 60 (1995), S. 543-552 
    Details
    ISSN: 1432-0649
    Keywords: 61.30.v ; 42.65.k
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The transients of Kerr-like optical nonlinearities in various liquid crystals observed with picosecond light-induced dynamic gratings are discussed. It is shown that relatively high intensities and strong optical fields of short laser pulses lead to rapid molecular reorientation, ultrasound generation, multiphoton absorption, cholesteric helix deformation and other new phenomena which are not only of interest for basic liquid-crystal research but also determine photonic switching times in liquid crystalline all-optical devices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01080933
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Extraction of nitrogen from soils (1989)
    Springer
    Biology and fertility of soils 8 (1989), S. 189-190 
    Details
    ISSN: 1432-0789
    Keywords: Nitrogen ; Ammonium ; Nitrate ; Nitrogen extraction ; Soils ; Nitrogen mineralization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A roller bed and rotary end-over-end shaker were compared for the extraction of mineral N from a variety of soil types; both were equally efficient with an optimum extraction time of 30 min. However, the roller bed permitted a greater operational capacity, a faster throughput of samples, and easier identification of sample bottles compared with the end-over-end shaker. More NH4 +-N and NO3 −-N (P〈0.001) was recovered from soil by 2 M KCl than by any other extractant, in a soil: extractant ratio of 1 to 5 (w:v), except water, which was equally efficient at removing NO3 −-N from soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00257765
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Organic carbon isotope ratios (δ13C) of Arctic Amerasian Continental shelf sediments (2000)
    Springer
    International journal of earth sciences 89 (2000), S. 522-532 
    Details
    ISSN: 1437-3262
    Keywords: Arctic Amerasian shelf Sediment carbon and nitrogen isotopes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract. Organic matter origins are inferred from carbon isotope ratios (δ13C) in recent continental shelf sediments and major rivers from 465 locations from the north Bering-Chukchi-East Siberian-Beaufort Sea, Arctic Amerasia. Generally, there is a cross-shelf increase in δ13C, which is due to progressive increased contribution seaward of marine-derived organic carbon to surface sediments. This conclusion is supported by the correlations between sediment δ13C, OC/N, and δ15N. The sources of total organic carbon (TOC) to the Amerasian margin sediments are primarily from marine water-column phytoplankton and terrigenous C3 plants constituted of tundra taiga and angiosperms. In contrast to more temperate regions, the source of TOC from terrigenous C4 and CAM plants to the study area is probably insignificant because these plants do not exist in the northern high latitudes. The input of carbon to the northern Alaskan shelf sediments from nearshore kelp community (Laminaria solidungula) is generally insignificant as indicated by the absence of high sediment δ13C values (–16.5 to –13.6‰) which are typical of the macrophytes. Our study suggests that the isotopic composition of sediment TOC has potential application in reconstructing temporal changes in delivery and accumulation of organic matter resulting from glacial–interglacial changes in sea level and environments. Furthermore, recycling and advection of the extensive deposits of terrestrially derived organic matter from land, or the wide Amerasian margin, could be a mechanism for elevating total CO2 and pCO2 in the Arctic Basin halocline.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005310000121
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    Paper (German National Licenses)
    Fulltext
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