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  • 1985-1989  (7)
  • 25.55.Ci  (2)
  • Chemistry  (2)
  • Nitrogen fixation  (2)
  • 61.16.Di  (1)
  • Vernonieae
  • diterpenes
Datenquelle
Materialart
Erscheinungszeitraum
Jahr
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    Nitrogen fixation and balance studies of rice soil (1987)
    Springer
    Biology and fertility of soils 4 (1987), S. 15-19 
    Details
    ISSN: 1432-0789
    Schlagwort(e): Nitrogen fixation ; N-balance studies ; Azolla ; Blue-green algae ; Chemical N fertilization ; Rice
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00280345
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  • 2
    Digitale Medien
    Digitale Medien
    Investigation of laser-annealed antimony implanted Si by ion backscattering and channeling and structure analysis (1986)
    Springer
    Applied physics 39 (1986), S. 147-153 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 44.90.+c ; 61.16.Di ; 61.70.Tm
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Rutherford backscattering (RBS), ion channeling and surface studies were done to investigate diffusion of ion implanted Sb in Si. Clean and polished Si was implanted by 190KeV Sb+ ions to a dose of 2.3×1015cm−2. Laser annealing was carried out by a single 10 J/cm2 laser pulse from a Nd: glass (7 ns FWHM) laser. Concentration profiles of Sb as a function of depth and dopant substitutionalities were measured by helium-ion backscattering and channeling. The laser shot resulted in melting of the central portion of the spot. A honey comb type surface morphology was found by SEM analysis. Dektak surface profiles showed a crater of 600 nm depth. One-dimensional heating calculations show that dopant diffusion depths, after consideration of simultaneous evaporation, can be ∼400 nm, whereas experiments indicate larger depths (∼1 μm). Calculated crater depth is roughly twice the experimental value. Measured depths are much larger than calculated by heat diffusion and indicate that regrowth and distribution of Sb has been modified by convection in the melt. We estimate good substitutionality up to 4 J/cm2 and discuss energy density dependence for such high-energy density laser pulses.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00616833
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  • 3
    Digitale Medien
    Digitale Medien
    Rice yields as influenced by Azolla N2 fixation and urea N-fertilization (1989)
    Springer
    Plant and soil 114 (1989), S. 63-68 
    Details
    ISSN: 1573-5036
    Schlagwort(e): Azolla pinnata ; Nitrogen fixation ; N yield ; Oryza sativa ; Urea-N
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract Application of 0, 30, 60, 90 and 120 kg N ha−1 of urea (U) in split doses with (and without)Azolla pinnata, R. Brown was studied for three consecutive seasons under planted field condition. Fresh weight (FW), acetylene reduction activity (ARA) and N yield of Azolla were found to be maximum 14 days after inoculation (DAI). Among the different treatments, maximum Azolla growth was recorded in no N control. The FW, ARA and N yield of Azolla were inhibited increasingly with the increase in N levels. Irrespective of season, FW and N yield of Azolla were inhibited only a small extent with 90 kg N ha−1 U, beyond which the inhibition was pronounced. ARA was inhibited only slightly up to 60 kg N ha−1 of U. Grain yield and crop N uptake of rice increased significantly up to 90 kg N ha−1 of U (alone or in combination with Azolla) in the dry seasons (variety IR 36) and up to 60 kg N ha−1 U in the wet season (variety CR 1018).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02203082
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  • 4
    Digitale Medien
    Digitale Medien
    Isospin decomposition of 0+ → 2+ and 0+ → 3− transition matrix elements by Coulomb nuclear interference observed in inelastic α-scattering from the even Zr isotopes (1987)
    Springer
    The European physical journal 326 (1987), S. 455-461 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 90,92,94,96Zr (α, α′) ; E=35.4 MeV ; measuredσ(Θ) of 2+ and 3− states ; deduced electromagnetic and isoscalar transition rates,M n /M p ratios ; 23.20.Js ; 25.55.Ci
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Coulomb-nuclear interference in inelastic scattering of 35.4 MeVα-particles from the stable even Zr isotopes was studied. In the framework of a collective DWBA analysis isoscalar and electromagnetic transition rates for low lying 2+ and 3− states were derived. The experimentalB (E2) values are in good agreement with results obtained by purely electromagnetic methods. The deducedM n /M p ratios of the 2 1 + levels exhibit a surprisingly large increase with increasing neutron number.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01289550
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  • 5
    Digitale Medien
    Digitale Medien
    Optical model analysis of90, 92, 94, 96Zr+4He elastic scattering at 35.4 MeV (1988)
    Springer
    The European physical journal 331 (1988), S. 309-313 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 25.55.-e ; 25.55.Ci
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The elastic scattering data of 35.4 MeV alpha particles from Zr-isotopes have been analysed using the optical model. Both the phenomenological and the folding model potentials have been employed in fitting the data with the optical model. The resultant systematics. concerning the volume integrals and the root mean square radii are summarized.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01355602
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  • 6
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: 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.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pen.760271609
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  • 7
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Notizen: 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.
    Zusätzliches Material: 14 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pc.750100511
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