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  • 1980-1984  (5)
  • 1965-1969
  • 1981  (5)
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 29 (1981), S. 180-183 
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Czechoslovak journal of physics 31 (1981), S. 32-40 
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The purpose of this paper is to develop a variational technique, using the variational principle of non-equilibrium thermodynamics for the solution of laminar stagnation point flow and heat transfer in two dimensions. The governing principle of dissipative processes is formulated for the problem and then using the boundary conditions of the system the elementary trial functions of third degree are assumed for the flow and temperature fields in the vicinity of the wall. The viscous and thermal boundary layer thicknesses, the skin friction and the rate of heat transfer from the wall to the fluid are obtained. It is found that these new approximate results are quite close to the exact known ones. These results are better than those of the Kármán-Pohlhausen technique.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of solution chemistry 10 (1981), S. 757-774 
    ISSN: 1572-8927
    Keywords: Cu(II)/Cu(I) couple ; Cu(I)/Cu(0) couple ; acetonitrile-water mixtures ; Fe(III) ; 2-hydroxycyanoethane ; electrochemistry ; voltammetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The electrochemical characteristics of the Cu (II)/Cu (I) and the Cu (I)/Cu (0) couples at platinum, carbon, mercury and copper have been studied in acetonitrile-water (AN-H2O) mixtures. All the electrode processes are moderately fast with mercury the fastest but slower on platinum and carbon paste in that order. A slow chemical step precedes oxidation of Cu (I) to Cu (II) on allectrodes in solutions of high AN content. The slow step may be partial removal of AN from the solvated Cu (I) ion prior to electron transfer. Electrode processes are faster in chloride ions than in sulfate ion solutions. Reduction of Cu (I) in AN−H2O is quite slow on glassy carbon. Adsorption of AN on platinum and carbon influences the processes. Diffusion coefficients in sulfate solutions are in the order, Cu (I) (AN−H2O)〉Cu (II)(AN−H2O)〉Fe (III)(H2O) and 2-hydroxy-cyanoethane (2-HCE) strongly decreases the mobility of Cu (I) when added to H2O. The relevance of the measurements to hydrometallurgical processes is considered. CuSO4 in 30% v/v AN−H2O is a ‘faster’ oxidant than the common oxidant Fe2(SO4)3 in H2O because of the greater mobility and faster electron acceptance from a corroding surface of Cu (II). Only in solutions of very high nitrile content is the reduction potential of CuSO4 as high as that of Fe2(SO4)3 in H2O.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-5036
    Keywords: Available N and P ; Azolla ; Blue-green algae ; Mineralization ; Organic manures ; Rice soil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Pot incubation study with fresh Azolla (Azolla pinnata-India and Vietnam isolates,A. mexicana andA. filiculoides), blue-green algaAulosira sp., green manureSesbania cannabina, Azolla compost, farm yard manure and ammonium sulphate was conducted under flooded condition at CRRI, Cuttack keeping an equivalent amount of 25 ppm N through all the amendments where changes in availability of N and P, C∶N ratio and pH were recorded. Application of chemical N-fertilizer recorded a release of about 87% NH4 +−N at 10th day of flooding which gradually decreased and reached the minimum of 6% at 50 days. The C∶N ratio of the organic manures ranged between 9–10 favouring release of NH4 +−N and among theAzolla speciesA. pinnata isolates released NH4 +−N more efficiently thanA. filiculoides andA. mexicana. A. pinnata Indian isolate released maximum of 88% NH4 +−N, whereas Vietnam isolate recorded 77% at 40 days of flooding; green manure on the other hand, reached a maximum of 50% release at 50 days. The blue-green alga recorded a gradual increase and attained the maximum release of 38% at 40 days of flooding. Farmyard manure recorded a highest NH4 +−N release of 69% at 20 days of flooding and gradual decrease thereafter, whereas Azolla compost released 41% at 40 days of flooding. Soil amended with fresh organic matter achieved reduction upto a pH of 7.2 after 50 days of flooding, whereas the pH in Azolla compost and farmyard manure amendment was 〈7. The P availability increased from 20th day onwards and reached the highest values of 26 and 18 ppm in the fresh organic matter and compost amended soil respectively after 40–50 days of flooding. The cumulative release of available P was found superior in fresh Azolla incorporation.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Acta mechanica 38 (1981), S. 183-190 
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Es wird die dreidimensionale, instationäre Strömung längs einer porösen, unendlichen Platte unterscht, bei der die Absaugegeschwindigkeit gegeben ist durch $$v_w (z) = v_0 \left[ {1 + \varepsilon \delta (t) cos\frac{{\pi z}}{l}} \right], \varepsilon〈〈 1$$ mit $$\begin{gathered} \delta (t) = 0, t〈 0, \hfill \\ = 1, t 〉 0. \hfill \\ \end{gathered} $$ Infolge der überlagerten Absaugegeschwindigkeit εv 0δ(t) cosπz/l wird die Strömung instationär und dreidimensional. Die Methode der Laplace-Transformation wird angewandt, um die instationäre Geschwindigkeitsverteilung zu ermitteln. Die Wandschubspannung wird in Richtung der Hauptströmung und senkrecht dazu bestimmt. Fürt»∞ erhält man die Grenzwerte der stationären Strömung.
    Notes: Summary Three-dimensional transient flow past a porous infinite plate is investigated when the suction velocity at the plate has the form $$v_w (z) = v_0 \left[ {1 + \varepsilon \delta (t) cos\frac{{\pi z}}{l}} \right], \varepsilon〈〈 1$$ where $$\begin{gathered} \delta (t) = 0, t〈 0, \hfill \\ = 1, t 〉 0. \hfill \\ \end{gathered} $$ Due to superimposed sinusoidal suction velocity εv 0δ(t) cos πz/l, the flow becomes unsteady and three-dimensional. The Laplace transform technique is used to find the unsteady velocity distribution. The skin friction at the wall along the main and cross-flow directions is obtained. It is found that ast→∞ the values of skin friction tend to steady state values.
    Type of Medium: Electronic Resource
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