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  • 1
    Electronic Resource
    Electronic Resource
    Optically monitoring and controlling epitaxial growth
    Amsterdam : Elsevier
    Journal of Crystal Growth 120 (1992), S. 71-77 
    Details
    ISSN: 0022-0248
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-0248(92)90366-Q
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  • 2
    Electronic Resource
    Electronic Resource
    A numerical investigation of scattering effects for teleseismic plane wave propagation in a heterogeneous layer over a homogeneous half-space (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 110 (1992), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Numerical simulations of teleseismic wave propagation in a heterogeneous layer over a homogeneous half-space are conducted to further our understanding of teleseismic coda generation. Acoustic and elastic finite difference synthetics are generated for more than 150 different layer-over-a-half-space models. The models vary in scattering layer thickness (L), heterogeneity correlation distance (a, or ax and az), and heterogeneity standard deviation (σ). The synthetic data are analysed by examining coda intensity envelopes and frequency-wavenumber spectra.The level of scattered energy is found to be controlled by the ka and σ values. Coda levels increase with increasing ka from ka≤ 1 to ka˜ 1, and decrease with increasing ka for ka 〉 1. Scattered energy levels always increase with increasing σ. Models that vary in scattering layer thickness alone did not consistently produce changes in the coda level or rate of decay independently of the values of ka and/or σ. The rate of coda decay is controlled by the heterogeneity aspect ratio (ax/az). Models with spatially isotropic heterogeneities (ax/az= 1) produce the slowest rate of decay, while those with an infinite aspect ratio (homogeneous, plane-layered models) produce the most rapid rate of decay. Any decay rate between these two extremes can be obtained by varying the heterogenity aspect ratio. Acoustic and elastic models exhibit similar coda intensity envelope characteristics. Apparent scattering attenuation of the direct pulse is a function of ka and is strongest for models with spatially isotropic heterogeneities.Frequency-wavenumber analysis showed that coda for models with spatially isotropic heterogeneities is composed largely of low apparent velocity energy in the form of P-to-S and/or body-to-surface wave scattered energy. Coda for models with spatially anisotropic heterogeneities is composed largely of vertically propagating layer reverberations. Coda for extreme anisotropic models is composed solely of vertically propagating layer reverberations. The onset time of low apparent velocity energy is also controlled by the heterogeneity aspect ratio. For models with anisotropic heterogeneities, low apparent velocity energy appears immediately after the first arrival, for models with an infinite heterogeneity aspect ratio (1-D models), low apparent velocity energy never appears.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1992.tb02087.x
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  • 3
    Electronic Resource
    Electronic Resource
    Applications of spectroellipsometry to the growth of GaAs and AlGaAs by metalorganic molecular beam epitaxy
    Amsterdam : Elsevier
    Journal of Crystal Growth 107 (1991), S. 1045-1046 
    Details
    ISSN: 0022-0248
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-0248(91)90603-3
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  • 4
    Electronic Resource
    Electronic Resource
    Source parameters of some large earthquakes in Northern Aegean determined by body waveform inversion (1991)
    Springer
    Pure and applied geophysics 135 (1991), S. 515-527 
    Details
    ISSN: 1420-9136
    Keywords: Moment tensor inversion ; North Aegean ; Greece
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Average source parameters for three large North Aegean events are obtained from body wave inversion for the moment tensor. The parameters for the events are as follows: The events exhibit dextral strike-slip faulting with theT axis striking NS and nearly horizontal, implying extension in this direction. The focal mechanisms obtained are in agreement with the seismotectonic regime of the North Aegean. It is known that the region is tectonically controlled by the existence of the strike-slip Anatolian fault and its westward continuation in the Aegean, as well as the NS extension the whole Aegean area undergoes. The components of the moment tensor show that the region is dominated by compression in the EW direction which is encompassed by extension in the NS direction. All the events were found to be shallow (≤10 km) with a source time function of approximately 8 s duration and small stress drop values. The teleseismic long period verticalP-waves exhibited distortions, that could be attributed to lateral inhomogeneities in the source structure or more probably to a nonflat water-crust interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01772403
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  • 5
    Electronic Resource
    Electronic Resource
    The statistical study of hydraulic geometry: A new direction for compositional data analysis (1991)
    Springer
    Mathematical geology 23 (1991), S. 349-366 
    Details
    ISSN: 1573-8868
    Keywords: hydraulic geometry ; unit hydraulic geometry ; derivative hydraulic geometry ; compositional data analysis ; unit-sum constraint ; ternary diagram ; logratio
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract Hydraulic exponents and unit hydraulic exponents are unit-sum constrained, which requires that they be analyzed by statistical methods designed for compositional data. Though uncertainties remain regarding selection of the “best” constraining operation and method of handling departures from the unit-sum constraint, neither category of uncertainty should be an impediment to the selection of the appropriate statistical methodology. In a small sample study, the hydraulic geometry of different types of streams were compared: (1) semi-arid: perennial vs. ephemeral; (2) tropical: Puerto Rico vs. West Malaysia; and (3) semi-arid vs. tropical (by pooling the previous data sets). All three comparisons revealed statistically significant differences in either logratio mean vectorsor logratio covariance matrices but not both. All six categories of data had logistic normal distributions. Because the derivatives at a given discharge of curvilinear hydraulic geometry relationships and hydraulic exponents on either side of the “breakpoints” of piecewise linear relationships are unit-sum constrained, they also can be studied by compositional methods. However, the compositional approach is limited in cases where distributions have large departures from logistic normality and for streams that have negative hydraulic exponents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02065787
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  • 6
    Electronic Resource
    Electronic Resource
    A further note on extreme monsoonal rainfall deficits in India (1987)
    Springer
    Theoretical and applied climatology 38 (1987), S. 174-179 
    Details
    ISSN: 1434-4483
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Zusammenfassung In einer vorhergehenden Arbeit wurden Karten über extreme Monsonregendefizite vorgelegt, wie sie wahrscheinlich innerhalb der einzelnen meteorologischen Untereinheiten Indiens vorkommen. Diese Arbeit präzisiert diese Studien auf Gebiete im Umkreis von 150 km jeder der 306 schon früher verwendeten Meßstationen. Hierbei werden Karten vorgelegt, die sowohl Prozentsätze der Regendefizite (bzw. der Durchschnittswerte) für Wiederholungszeiten von 2, 5, 10 und 50 Jahren als auch räumliche Muster der Wiederholungszeiten für Defizite von 40, 50, 60 und 70% unter dem Durchschnittswert angeben. Dem sind Grafiken von 25 Stationen beigefügt, die die Zusammenhänge von Defizitintensität und Wiederholungszeit zeigen.
    Notes: Summary In a previous paper, maps were provided of the extreme monsoonal rainfall deficits likely to occur somewhere within individual Standard Meteorological Sub-Divisions in India. The present paper extends this study to similar evaluations for areas of radius 150 km around each of the 306 stations used in the previous study. Maps are presented of percentage rainfall deficits (or percentage of average values) with return periods of 2, 5, 10 and 50 years, and of the spatial pattern of return periods for deficits of 40%, 50%, 60% and 70% below the average. In addition, there are graphs for 25 stations displaying the relationships between deficit intensity and return period.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00868102
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  • 7
    Electronic Resource
    Electronic Resource
    Extreme monsoonal rainfall deficits in India (1986)
    Springer
    Theoretical and applied climatology 37 (1986), S. 194-204 
    Details
    ISSN: 1434-4483
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Zusammenfassung Die Daten über den sommerlichen Monsunregen (Juni–September) aus 70 Jahren (1901–70) von 306 Stationen in Indien werden in 32 Teilgebiete gruppiert. Zur Analyse der wiederkehrenden Perioden extremen Regendefizits in jedem dieser Teilgebiete wird die Theorie extremer Ereignisse verwendet, wobei die log-Pearson-Häufigkeitsverteilung vom Typ III eher in einem räumlichen als zeitlichen Zusammenhang verwendet wird. Die sich daraus ergebenden Schätzungen für wiederkehrende Perioden von 2, 5 und 10 Jahren werden mit den Mustern verglichen, die mit Hilfe der auf alle 306 Stationen einzeln angewandten Gaußschen Häufigkeitsverteilung gewonnen wurden. Die Abschätzung 50jähriger und 100jähriger Ereignisse wird ebenfalls besprochen.
    Notes: Summary Data from 306 stations in India, for the 70 years (1901–70) of summer (June–September) monsoonal rainfall, are grouped into 32 sub-regions. Extreme event theory is used to analyse the return periods of extreme rainfall deficits within each of these sub-regions, using the log-Pearson type III frequency distribution in a spatial rather than a temporal context. The resultant estimates for 2, 5 and 10 year return periods are compared with the patterns derived from the Gaussian frequency distribution applied to the 306 stations individually; the 50 and 100 year return period estimates are also considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00867577
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