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  • Articles: DFG German National Licenses  (2)
  • 1995-1999  (1)
  • 1985-1989  (1)
  • 1975-1979
  • Heat flow  (1)
  • Nitrate  (1)
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  • Articles: DFG German National Licenses  (2)
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  • 1995-1999  (1)
  • 1985-1989  (1)
  • 1975-1979
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  • 1
    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
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A Robust Rapid-Response Probe for Measuring Bottom-Hole Temperatures in Deep-Ocean Boreholes (1997)
    Springer
    Marine geophysical researches 19 (1997), S. 267-281 
    Details
    ISSN: 1573-0581
    Keywords: Heat flow ; hydrogeology ; instrumentation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A new probe has been constructed for making temperature measurements 1.1 m ahead of the bit in Ocean Drilling Program (ODP) boreholes. Temperatures are recorded at positions 1 and 11 cm above the tip of the probe. The combination of the dual temperature records and accelerometer data provides valuable information about disturbances that may affect the quality of measurements. Long battery life, and memory access via an external communications port, allow service-free operation for the full duration of typical drilling legs. Temperature resolution varies over the 110 K measurement range, from nominally 1 mK from -5 to 20 °C, to about 10 mK at 105 °C. The small (8 mm) diameter of the probe tip allows rapid thermal equilibration after penetration. The shallow (2.5°), continuous taper of the lower part of the probe serves to reduce the tendency of the formation to be cracked when the tool is pushed into the formation. It is sufficiently robust, however, to survive penetration into highly consolidated sediment and occasional contact with igneous rock. The tool was used for a total of 44 bottom-hole temperature measurements between 38 and 573 meters below seafloor (mbsf) during Leg 168, as well as for several logging runs in open holes. We anticipate adding a port in the tip to permit measurement of formation fluid pressure, and to enhance the utility of the tool for logging temperature profiles in open holes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004292930361
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    Paper (German National Licenses)
    Fulltext
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