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  • 68.55  (2)
  • Dobson-Brewer intercomparison  (1)
  • FISH  (1)
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  • 1
    ISSN: 1432-0630
    Keywords: 68.55 ; 61.16D ; 61.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We have used STM to study the surface morphology of thin epitaxial Ge films grown on Si(001) in the presence of the “surfactant” As. The surfactant forces layer-by-layer growth up to 12 ML Ge coverage which could partly be explained by the geometrical surface arrangement of the growing film. Beyond 12 ML coverage we observed a network of trenches which decorate the earlier described V-shaped defects inside the film. Overgrowth of such defects is studied and a mechanism discussed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 62 (1996), S. 217-221 
    ISSN: 1432-0630
    Keywords: 68.55 ; 68.55Ln ; 61.16Ch ; 62.40 ; 83.50.By
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Time-resolved,in-situ-applied STM has been used to study the epitaxial growth of iron on W(110) at room temperature. By this way, sequences of STM images show directly the atomistics of the growth process on the surface. The first layer of iron on W(110) grows pseudomorphically without a preferred growth direction. Beginning with the second layer, the islands grow anisotropically with preferred growth in the [001]-direction. The generation of an ordered two-dimensional dislocation network starts at a coverage of 1.4 pseudomorphic monolayers to relax the misfit of 9.4%. A direct correlation of the creation of misfit dislocations in the second layer and the nucleation of the third-layer islands was found. Together with the onset of strain relaxation, the growth mode abruptly changes from layer-by-layer to statistical growth. A quantitative statistical analysis of the data allows to exactly determine the onset of relaxation, the vertical location of the dislocation lines, and the lateral extension of an island that is necessary to induce the formation of dislocations.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-6849
    Keywords: chromosome ; evolution ; FISH ; intrachromosomal rearrangements ; phylogeny ; subregional chromosome painting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We have usedAlu polymerase chain reaction generated probes from rearranged human/rodent somatic cell hybrids for fluorescencein situ hybridization and comparative mapping of some intrachromosomal changes in the karyotypes of great apes (Pan troglodytes, P. paniscus, Gorilla gorilla Pongo pygmaeus), a gibbon (Hylobates lar), and an Old World monkey (Macaca fuscata). Probes containing chromosomes 2 and 18 fragments confirmed inversions already suggested by the banding pattern of great ape homologues. However, a chromosome 3 fragment showed complex rearrangements in the gibbon and macaque karyotype which were previously not well defined from banding. ‘Subchromosomal painting’ will allow the identification of intrachromosomal changes on the basis of DNA homology and provides a powerful method to study karyological and genomic evolution.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of atmospheric chemistry 4 (1986), S. 359-374 
    ISSN: 1573-0662
    Keywords: Dobson recalibration ; Dobson-Brewer intercomparison ; accuracy of ozone spectrophotometer ; total ozone measurements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Description / Table of Contents: Zusammenfassung Vom 27. August bis 1. September 1984 befand sich das Brewer Standard Spektrophotometer 17 (Sci-Tec Instruments Inc., Canada) am Meteorologischen Observatorium Hohenpeißenberg (MOHP), um den nicht sehr stabilen Brewer 10 zu überprüfen und neu zu kalibrieren. Der Brewer 17 wurde erstmals im Juli 1983 kalibriert, die Gültigkeit dieser Eichung wurde mehrfach vor und einmal nach dem Aufenthalt am MOHP bestätigt (Kerr et al., 1985; Kerr, 1984). Das Instrument erwies sich als sehr stabil und geeignet als transportables Standardinstrument. Da der Dobson 104 zum damaligen Zeipunkt ebenfalls nicht gut kalibriert schien, wurde die Gelegenheit einer Dobson-Neukalibrierung wahrgenommen. Die normalerweise benutzten Methoden waren nicht zufriedenstellend im Gegensatz zu einer Methode, die von ‘Effektiven Absorption Coeffizienten’ (EAC) ausgeht. Diese von Kerr et al. auf dem Quadrennial Ozon Symposium 1984 in Griechenland vorgestellte Methode lieferte hier ermutigende Ergebnisse. Vor der Neueichung zeigte der Dobson 104 eine Differenz von etwa 2–3% im Vergleich mit Brewer 10-, Brewer 17- und TOMS- (auf dem Nimbus-7-Satelliten) Messungen, während die Übereinstimmung mit den Brewer-Geräten nach der “EAC-Kalibrierung’ gut war (ΔX rel 〈 1%). Die verschiedenen Dobson-Kalibrierungsmethoden werden verglichen und Ergebnisse der Dobson 104- und Brewer 10-Neukalibrierungen werden vorgestellt.
    Notes: Abstract The well calibrated Brewer spectrophotometer 17 (Sci-Tec Instruments Inc., Canada) stayed at the Meteorological Observatory Hohenpeissenberg (MOHP) from August 27 until September 1, 1984, in order to check and recalibrate Brewer 10, which had some stability problems. Brewer 17 was initially calibrated in July 1983, the validity of this calibration was repeatedly verified before and after the stay at the MOHP (Kerr et al., 1985; Kerr, 1984). The instrument proved itself to be very stable and appropriate as travellings standard instrument. As Dobson 104 didn't seem to be well calibrated at that time, the occasion was taken to perform also a Dobson recalibration. The methods normally used were not satisfactory, but a different method, presuming ‘Effective Absorption Coefficients’ (EAC), presented by Kerr et al. at the Quadrennial Ozone Symposium 1984 in Greece, yielded encouraging results. Before recalibration Dobson 104 showed a difference of 2–3% in comparison to Brewer 10-, Brewer 17- and TOMS- (on satellite Nimbus 7) measurements, whereas the agreement with the Brewers after ‘EAC-calibration’ was good (ΔX rel 〈 1%). The different Dobson calibration methods are compared and the results of the Dobson 104 and Brewer 10 recalibrations are presented.
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