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  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Irrigation science 6 (1985), S. 141-146 
    ISSN: 1432-1319
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Irrigation science 16 (1995), S. 47-51 
    ISSN: 1432-1319
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
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  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Nutrient cycling in agroecosystems 31 (1992), S. 209-214 
    ISSN: 1573-0867
    Keywords: Guano ; organic fertilizers ; N fertilizers ; organic farming ; N mineralization ; CO2 evolution ; fertigation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Guano is a natural organic fertilizer used in organic farming management when supplementary nitrogen is needed. In modern irrigated agriculture N top dressing is often applied through the irrigation water. The objective of this research was to evaluate the potential of guano as a source of available N when applied through water, compared with application to soil. The release of mineral and total soluble N from guano to water was monitored, as a function of time, under laboratory conditions, and compared with mineralization of guano in soils. The effect of guano:water ratio, aeration of the mixtures, addition of rock-phosphate or clay minerals, and temperature on the composition of the solutions was determined. Guano released more than 90% of its N content into solution during 10 d at a guano:water ratio of 1:10 at 27°C. The release of soluble N, of which 85% was NH4-N, was linked with an increase of pH from 7.0 to 8.5 or more. None of the treatments increased the rate or the total N release beyond that. Suboptimal temperatures, 13.6 ± 4.7°C or 50°C, greatly reduced the rate of guano-N release to solution. The mineralization of guano in soil was more rapid than in water, but the total N release was the same, leading to the conclusion that the application of guano through the irrigation water may be as efficient as directly to soil, provided sufficient time for fermentation is allowed.
    Type of Medium: Electronic Resource
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  • 14
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied climatology 14 (1966), S. 400-400 
    ISSN: 1434-4483
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 15
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied climatology 14 (1965), S. 224-262 
    ISSN: 1434-4483
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Summary A series ofn members can be considered as one of the possible permutations of its members. It is shown that the sum of the linear successive differences is equal to the expression $$\sum\limits_{j - 1}^{n - 1} {(\alpha _j \Delta _j )} $$ , where the αj are positive integers, dependent only upon the rank-order (the permutation) of the members, while the Δj are independent of the order of the succession and are determined by the dispersion of the members of the series. The factors αj and Δj are separately investigated; the expected value of the sum of the linear successive differences is established. Various related statistical measures, already in usage and new ones suggested here, are discussed. Series of yearly rainfall amounts are used to show the effects of the αj and Δj and to discuss the behaviour of the various measures.
    Abstract: Résumé Une série, constituée parn valeurs, est regardée comme une des possibles permutations de ces valeurs. L'auteur montre que la somme des différences absolues, qui se présentent entre les valeurs consécutives de la série, est égale à l'expression $$\sum\limits_{j - 1}^{n - 1} {(\alpha _j \Delta _j )} $$ . Les αj sont des nombres entiers positifs et ne dépendent que de l'ordre des membres de la série, tandis que les Δj, indépendants de l'ordre, sont déterminés par la dispersion des membres. Les facteurs αj et Δj sont étudiés séparément; l'espérance mathématique de la somme mentionnée est dérivée. Des paramètres statistiques déjà connus ou proposés ici pour la première fois, sont discutés. Le rôle des αj et des Δj et le comportement des divers paramètres sont montrés à l'aide de séries de totaux annuels de pluies.
    Notes: Zusammenfassung Eine endliche Reihe (Sequenz) wird als eine der möglichen Permutationen ihrer Glieder aufgefaßt. Es wird gezeigt, daß die Summe der absoluten Differenzen der aufeinanderfolgenden Glieder gleich ist $$\sum\limits_{j - 1}^{n - 1} {(\alpha _j \Delta _j )} $$ , wo die α natürliche Zahlen sind und nur von der Rangordnung der Glieder der Reihe (von der Permutation) abhängen; die Δj sind von der Reihenfolge unabhängig und werden durch die Dispersion der Reihenglieder bestimmt. Die αj und die Δj werden separat untersucht; der Erwartungswert der erwähnten Differenzsumme wird abgeleitet. Verschiedene bereits bekannte und auch erstmalig hier vorgeschlagene Maßzahlen werden geprüft. An Reihen jährlicher Regenmengen wird die Rolle der αj und der Δj und das Verhalten der besprochenen Maßzahlen veranschaulicht.
    Type of Medium: Electronic Resource
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  • 16
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 33 (1987), S. 2689-2705 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Tensile mechanical properties of DOP-plasticized poly(vinyl chloride) (PVC) and methyl methacrylate-butyl acrylate copolymer (MMA-BA) or ethylene vinyl acetate-vinyl chloride copolymer (EVA-VC) modified PVC have been studied. The irreversible deformation processes have been investigated using optical microscopy. Thermal analysis and x-ray diffraction were used to investigate the structure of the PVC blends. The differences in behavior observed for the modified and plasticized PVC are discussed on the basis of their morphology.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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