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  • Chemistry  (10)
  • Azolla  (3)
  • Nuclear reactions  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Nitrogen fixation and balance studies of rice soil (1987)
    Springer
    Biology and fertility of soils 4 (1987), S. 15-19 
    Details
    ISSN: 1432-0789
    Keywords: Nitrogen fixation ; N-balance studies ; Azolla ; Blue-green algae ; Chemical N fertilization ; Rice
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A nitrogen balance study conducted in ceramic pots under net house conditions for four seasons showed that flooded rice soil leaves a positive nitrogen balance (N increase) in soil after rice cropping in both fertilized and unfertilized soil. Recovery of nitrogen from rice soil was more than its input in unfertilized soil, but it was reverse in fertilized soil. Incorporation of Azolla or BGA twice as basal and 20 days after transplanting (DAT) alone or in combination showed higher nitrogen balance and N2-fixation (N gain) in soil than in that where it was applied once either as basal or 20 DAT. Planted soil showed more N2-fixation than that of fallow rice, and flooded soil fixed more nitrogen in comparison to non-flooded soil in light but less in dark. Soil exposed to light fixed more nitrogen than that of unexposed soil in both flooded and non-flooded conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00280345
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  • 2
    Electronic Resource
    Electronic Resource
    Alpha scattering from ^9^2Zr and ^9^4Zr
    Amsterdam : Elsevier
    Nuclear Physics, Section A 458 (1986), S. 1-11 
    Details
    ISSN: 0375-9474
    Keywords: Nuclear reactions
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9474(86)90279-4
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  • 3
    Electronic Resource
    Electronic Resource
    Inelastic α-scattering from ^9^0Zr and ^9^6Zr
    Amsterdam : Elsevier
    Nuclear Physics, Section A 455 (1986), S. 399-412 
    Details
    ISSN: 0375-9474
    Keywords: Nuclear reactions
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9474(86)90314-3
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  • 4
    Electronic Resource
    Electronic Resource
    Threshold anomaly in ^1^6O + ^2^0^9Bi system
    Amsterdam : Elsevier
    Nuclear Physics, Section A 555 (1993), S. 606-620 
    Details
    ISSN: 0375-9474
    Keywords: Nuclear reactions
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9474(93)90490-O
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  • 5
    Electronic Resource
    Electronic Resource
    Comparative efficiency of Azolla, blue-green algae and other organic manures in relation to N and P availability in a flooded rice soil (1981)
    Springer
    Plant and soil 62 (1981), S. 35-44 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF02205023
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  • 6
    Electronic Resource
    Electronic Resource
    Mechanism of sulphur transport through preformed oxide scales (1980)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 31 (1980), S. 682-688 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Mechanismus des Transports von Schwefel durch vorher entstandene OxidzunderschichtenDie Möglichkeiten für den Transport von Schwefel durch vorher entstandene Oxidzunderschichten werden thermodynamisch untersucht, wobei die Grenzbedingungen ermittelt werden, unter denen die verschiedenen Mechanismen - Auflösung und Diffusion, Moleküldiffusion und Gasdiffusion - auftreten können. Die Ergebnisse werden für Nickel und Kobalt überprüft; daraus ergibt sich der Schluß, daß zwar grundsätzlich beide Mechanismen parallel vorliegen können, daß jedoch die Permeation von Gasmolekülen gefährlicher ist, da sie in einem breiteren Bereich von Gaszusammensetzungen wirksam werden kann. Außerdem wird deutlich gezeigt, daß durch die auf Kobalt aufwachsenden Oxidzunderschichten Schwefeldioxidmoleküle diffundieren können.
    Notes: The possibilities for transport of sulfur through preformed oxide scales by both solution-diffusion and molecular gas (24) permeation mechanisms are examined thermodynamically to establish the limiting conditions under which each is viable.The results are tested, using nickel and cobalt specimens, and it is concluded that, although both mechanisms may operate in parallel, the permeation of gas molecules is the more dangerous since it can operate over wider ranges of gas atmosphere composition. The permeation of SO2 molecules throu through oxide scales growing on cobalt is clearly demonstrated.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19800310903
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  • 7
    Electronic Resource
    Electronic Resource
    Symbiotic algal nitrogenase activity and heterocyst frequency in sevenAzolla species after phosphorus fertilization (1988)
    Springer
    Hydrobiologia 169 (1988), S. 313-318 
    Details
    ISSN: 1573-5117
    Keywords: Azolla ; symbiont ; Anabaena azollae ; heterocyst ; acetylene reducing activity ; phosphorus ; fertilization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Seven species ofAzolla (A. caroliniana, A. microphylla, A. nilotica, A. filiculoides, A. mexicana, A. rubra, A. pinnata the last from both Malaysia and India) grown in pots of flooded soil were subjected to three different treatments with respect to P: none, single application, split application. The experiments were carried out under greenhouse conditions. Heterocyst frequency inAnabaena azollae and acetylene reducing activity (ARA) were studied in successiveAzolla leaves. Both variables increased from the first leaf (shoot apex) to the last one (before branch) in all species in the presence or absence of P. However, heterocyst frequency, ARA andAzolla biomass were all less in the treatment lacking P. Heterocyst frequency inA. azollae, ARA and biomass ofAzolla were higher when P was applied in split doses than in the other treatments.Azolla plants exhibited more ARA than the isolated leaves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00007554
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  • 8
    Electronic Resource
    Electronic Resource
    Studies on thermal stability of modified polycarboxylate cements (1995)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 224 (1995), S. 109-114 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Poly(acrylsäre-co-acrylamid) wurde mit Zinkoxid und Kryolith (Na3AlF6) in unterschiedlichen Verhältnissen gemischt und bei Raumtemperatur zu Zahnzementen ausgehärtet. IPDT, Temperaturen bei maximaler Abbaugeschwindigkeit, Aktivierungsenergien und Frequenzfaktoren des thermischen Abbaus der Proben wurden aus thermogravimetrischen Messungen ermittelt. Die Probe mit 20 Gew.-% Kryolith in der Füllstoffmischung ist thermisch sehr stabil.
    Notes: Dental cement compositions made by mixing poly(acrylic acid-co-acrylamide) and mixtures of zinc oxide and cryolite (Na3AIF6) in various proportions of 10-50 wt.-% (w/w) were cured at room temperature. From thermogravimetric analyses of the samples, the integral procedural decomposition temperatures (IPDT), maximum decomposition temperatures, activation energies and frequency factors were evaluated. The cured cement sample containing 20 wt.-% cryolite in the filler mixture is thermally very stable.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1995.052240111
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  • 9
    Electronic Resource
    Electronic Resource
    The effect of processing variables on microstructure of injection molded short fiber reinforced polypropylene composites (1989)
    Brookfield, Conn. : Wiley-Blackwell
    Polymer Composites 10 (1989), S. 344-351 
    Details
    ISSN: 0272-8397
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Injection molded composites of polypropylene reinforced with short glass fibers were obtained under a variety of injection molding conditions. The microstructure of the moldings was determined using a variety of experimental techniques, including optical and scanning electron microscopy, differential scanning calorimetry, Fourier transform infra-red spectroscopy, and thermogravimetry. Thus, it was possible to obtain a detailed characterization of the crystallinity, morphology, and orientation distribution in the matrix, in addition to the distribution of fibers and their orientation of the fibers in the composite. The influence of molding conditions on the above microstructural characteristics is summarized in an effort to explain the experimental observations.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pc.750100511
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  • 10
    Electronic Resource
    Electronic Resource
    Microstructure and mechanical behavior of reinforced reaction injection molded (RRIM) polyurethane (1987)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 27 (1987), S. 1258-1264 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: A study was carried out to characterize the microstructure and distribution of some mechanical properties in reinforced reaction injection molding panels (RRIM). The panels were prepared under a variety of processing conditions. Scanning electron microscopy, differential scanning calorimetry, and Fourier transform infrared analysis were employed for microstructure characterization. The following mechanical tests were carried out: dynamic mechanical, tensile, and impact. The results indicate significant relationships between processing conditions, microstructure, and mechanical properties. In particular, the skin/core structure of the panels and the size distribution of bubbles in the matrix have an important effect on the impact properties. Furthermore, the balance between the distributions of cure and crystallinity, which is difficult to define clearly, plays an important role in determining panel behavior.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760271609
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