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  • 1980-1984  (2)
  • Nitrogen fractions  (1)
  • power-law model  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Rheological study of black coal-oil suspensions (1984)
    Springer
    Rheologica acta 23 (1984), S. 195-206 
    Details
    ISSN: 1435-1528
    Keywords: Black coal ; oil ; suspension ; ageing ; power-law model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The rheological study of coal-oil suspensions is very important because of their application in many industries as alternative fuels to petroleum oil. In this work, the flow behaviour of black coal-oil suspension was studied for a range of coal volume fractions from 0.0378 to 0.427. Shear stresses were measured for shear rates up to 200 s−1 using a Weissenberg Rheogoniometer. All the suspensions behaved like non-Newtonian liquids and exhibited significant increases in apparent viscosity on storage. The flow behaviour of both freshly prepared and aged suspensions was able to be described by power-law models. A model similar to that given by Chong was used to establish relation between the relative apparent viscosity and coal volume fraction for freshly prepared as well as all aged suspensions. A correlation was also established between ageing time and maximum coal volume fraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01332075
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of continuous cropping and fertilizer use on the organic nitrogen fractions in a typic ustochrept soil (1981)
    Springer
    Plant and soil 62 (1981), S. 377-383 
    Details
    ISSN: 1573-5036
    Keywords: Continuous cropping ; Fertilizer use ; Multiple cropping ; Nitrogen fractions ; Nitrogen losses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The influence of continuous cropping and soil test based fertilizer use on the organic nitrogen fractions in the plough layer has been studied in a Typic Ustochrept soil. Seven years of multiple cropping without manuring caused marked depletion in all the hydrolysable fractions except unidentified hydrolysable N namely, hexosamine (48.8%), hydrolysable ammonium (23.9%) and amino acid (7.3%) as compared to an adjacent fallow. Fertilizer nitrogen application maintained the levels of various forms of N as in the fallow plots and nitrogen in conjunction with phosphorus raised the status of amino acid N. Phosphate improved the contents of hydrolyzable ammonium and total hydrolyzable N whereas farmyard manure enhanced the latter only. The system of intensive cropping followed with appreciably high doses of fertilizers favoured greater immobilization of N in hydrolyzable ammonium and total hydrolyzable fractions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374135
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    Paper (German National Licenses)
    Fulltext
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