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  • 1
    Electronic Resource
    Electronic Resource
    Determination of Fe-55 and Ni-63 using semi-preparative ion chromatography – a feasibility study (1997)
    Springer
    Fresenius' journal of analytical chemistry 357 (1997), S. 864-869 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract  The feasibility of semi-preparative high-performance ion chromatography (HPIC) for the analysis of the activation products Fe-55 and Ni-63 in samples of different sources was studied. A mixed anion/cation exchanger column was applied to the separation of Fe(III), Ni(II) and Co(II) using 1 mmol/L PDCA-solution as an eluent. After fractionation of the eluate, Fe(III)- and Ni(II)-fractions were analysed by low-level liquid scintillation counting (LSC). The method was applied to the analysis of corrosion products originating from the primary circuit of a shut-down nuclear power plant. The limits of detection are dependent on the loading of metal ions on the column and are therefore given in terms of specific activities. For a typical sample composition they were found to be 0.011 Bq per mg Fe for Fe-55 and 0.054 Bq per mg Ni for Ni-63. An assessment of semi-preparative HPIC connected to off-line and on-line LSC as compared with standard radiochemical procedures is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050264
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  • 2
    Electronic Resource
    Electronic Resource
    Biocontrol of seedling diseases of barley and wheat caused by Fusarium culmorum and Bipolaris sorokiniana: effects of selected fungal antagonists on growth and yield components (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 44 (1995), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The purpose of this study was to verify, under natural conditions, biological control effects obtained in a former screening programme against Fusarium culmorum. The most successful antagonists against seedborne Fusarium culmorum and Bipolaris sorokiniana were isolates of Chaetomium sp., Idriella bolleyi and Gliocladium roseum. These results were also obtained when the antagonists were applied to B. sorokiniana-infected barley sown in field soil in pots. In field experiments, G. roseum gave the best control of F. culmorum in winter wheat. One month after sowing, germination increased by 170%, the disease index decreased by 73% and plant dry weight increased by 25%, compared to untreated plots. At harvest, the number of tillers per row was found to have increased by 53%, yield had increased by 160% and the 1000-grain weight had increased by 4%. For all evaluated parameters the effect was significantly different from the untreated plots and not significantly different from the plots treated with the fungicide, Sibutol LS 280. I. bolleyi gave a lower but still significantly effective control, when evaluated for disease index and numbers of tillers per row, while Chaetomium sp. did not show any reduction in the disease. Furthermore, in field experiments using barley infected with B. sorokiniana, a significant effect of G. roseum was demonstrated as increased plant dry weight after 1 month and increased 1000-grain weight at harvest. The disease-controlling effect of G. roseum on F. culmorum was shown in a field experiment with spring barley.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1995.tb01669.x
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  • 3
    Electronic Resource
    Electronic Resource
    Applications of High-Energy Synchrotron Radiation for Structural Studies of Polycrystalline Materials (1997)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 4 (1997), S. 147-154 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The large penetration power of high-energy X-rays (〉60 keV) raises interesting prospects for new types of structural characterizations of polycrystalline materials. It becomes possible in a non-destructive manner to perform local studies, within the bulk of the material, of the fundamental materials physics properties: grain orientations, strain, dislocation densities etc. In favourable cases these properties may be mapped in three dimensions with a spatial resolution that matches the dimensions of the individual grains. Imbedded volumes and interfaces become accessible. Moreover, the high energies allow better in-situ studies of samples in complicated environments (industrial process optimization). General techniques for research in this energy range have been developed using broad-band angle-dispersive methods, on-line two-dimensional detectors and conical slits. Characterizations have been made at the level of the individual grains and grain boundaries as well as on ensembles of grains. The spatial resolution is presently of the order of 10–100 μm. Four examples of applications are presented along with an outlook.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049597002021
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  • 4
    Electronic Resource
    Electronic Resource
    The orientation relationship between tetragonal zirconia precipitates with regard to elastic interaction energy (1995)
    Springer
    Journal of materials science 30 (1995), S. 5681-5686 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The elastic interaction energy between tetragonal zirconia precipitates for different mutual orientations is considered. The results of numerical analysis of this procedure are compared with experimentally observed preferred orientation relationships in the ceria-magnesia-partially stabilized zirconia (CM-PSZ) system. Two variants appear favourable, a parallel-stepped precipitate configuration with precipitate centres stepped at about 20°, and orthogonal precipitates in an edge-face configuration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00356705
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  • 5
    Electronic Resource
    Electronic Resource
    The Migration of High Angle Grain Boundaries during Recrystallization (1998)
    Springer
    Interface science 6 (1998), S. 95-104 
    Details
    ISSN: 1573-2746
    Keywords: grain boundaries ; migration rates ; recrystallization ; stereology ; orientation imaging ; texture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract When plastically deformed metallic materials are annealed, new strain free grains emerge from the microstructure and grow by means of grain boundary migration until the deformation microstructure is eliminated. This process is called recrystallization. In this paper the various methods by which grain boundary migration rates are measured stereologically in order to characterize the growth process are described and compared using illustrations from recrystallization experiments on commercial AA1050 aluminum. It seems abundantly clear that during recrystallization of cold-deformed materials, isothermal grain boundary migration rates decrease with time and reasons for such a decrease are discussed. A new methodology whereby migration rates of the individual recrystallization texture components may be quantified by combining stereology and orientation imaging by the electron back scattered pattern analysis is outlined. By illustration, recent experiments on aluminum and copper are summarized documenting the slight growth rate advantage the cube texture component (001)[100] possesses during recrystallization of cold rolled material. The role of orientation pinning effects on grain boundary migration is described briefly. It appears that such pinning effects allow recrystallized grains emerging from the weaker deformation texture components to enjoy an average growth rate advantage over those emerging from the stronger deformation texture components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008668604733
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  • 6
    Electronic Resource
    Electronic Resource
    Selection of biological control agents for controlling soil and seed-borne diseases in the field (1997)
    Springer
    European journal of plant pathology 103 (1997), S. 775-784 
    Details
    ISSN: 1573-8469
    Keywords: antagonists ; biological control ; comparative screening ; field screening ; rhizosphere competence ; field performance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Different screening methods for selection of biological control agents (BCAs), for controlling soil and seed-borne diseases, are discussed. The shortcomings of laboratory methods focused on mechanism of action are discussed and we conclude that these methods should be used with caution if candidates with multifactorial or plant mediated mechanisms of control are to be obtained. In vitro screens may be useful for specific groups of microorganisms, thus, screens for antibiotics may be relevant for Streptomyces spp., and promising results have been obtained using soil plating or precolonized agar methods to screen for mycoparasitism and competitive saprophytic ability. Experience with screening in the Nordic programme ‘Biological control of seed borne diseases in cereals’ is summarized. Research in the four participating countries – Finland, Sweden, Norway and Denmark – followed the same paradigm: that of obtaining antagonists, well adapted to different Nordic environments, and developing them as effective BCAs. Potential antagonists were isolated from different sources and in planta screening methods were developed in order to optimize selection of antagonists effective against a range of seed borne pathogens. Screens in the laboratory or greenhouse were followed by screening in the field. The different screening procedures are compared and evaluated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008662313042
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  • 7
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    A comparison of the volcanic records over 4000 years from the GRIP and DYE 3 ice cores (1997)
    In:  EPIC3J Geophys Res, GISP2/GRIP spec issueC12), 102, pp. 26707-26723
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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  • 8
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    Flow properties of the ice from the Greenland Ice Core Project ice core: The reason for folds? (1997)
    In:  EPIC3Journal of Geophysical Research-Oceans, Vol. 102 (C12), pp. 26831-26840
    Details
    Publication Date: 2019-07-17
    Description: Long-term deformation tests on ice from the Greenland Ice Core Project (GRIP) deep ice core show that ice from the different climate zones in the ice core has flow properties correlated with the concentrations of impurities in the sample. The deformation tests are performed by uniaxial unconfined compression at -16 degrees C with an octahedral compression stress of 3 bars. The ice samples are compressed for 1/2 to 3 years until the tertiary strain rate is reached. It is believed that by the end all downhole flow conditions are forgotten and that the ice sample has settled in a state determined by the applied stress and temperature conditions. All samples are tested under the same stress and temperature conditions so the resulting deformation rates and final ice crystal size and fabrics can only differ due to varying impurity concentrations. The results show that ice from cold climatic periods with high concentrations of impurities deforms more slowly than ice from warm climatic periods in compression. When tertiary creep is reached, the crystal size is smaller in the cold ice than in the warm. The ice from warmer climatic periods with lower concentrations of impurities deforms at a factor of 2-3 times more rapidly in compression. The tertiary steady state crystal size is increased by 50% and the ice crystals have oriented more favorably for the applied compression in the warm ice, which is believed to be the reason why the strain rates are greater here than in the cold ice. In the bottom 200 m of the GRIP ice core, zones are observed with folds on the scale of 1-8 cm. An investigation of the ice layers in and around the folds shows that the layers are composed of ice from different climatic zones. The folding is believed to result from the different flow and rheological properties of the layers involved in the folding structures.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 9
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    A search in North Greenland for a new ice core drilling site (1997)
    In:  EPIC3Journal of Glaciology, 43(144), pp. 300-306
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 10
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    Observation of the DecayΞ0→Σ+e−ν¯e (1999)
    American Physical Society
    Details
    Publication Date: 1999-05-10
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society
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