Atmosphärenmodelle und astronomische sowie parallaktische Refraktion     

Josef Kabeláč 《Studia Geophysica et Geodaetica》1967,11(1):1-20

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Josef petřík (1866–1966)     

Josef Ryšavý Jaroslav Pudr 《Studia Geophysica et Geodaetica》1966,10(4):486-486

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Experimental determination of the “capacity” of ice crystals     

Josef Podzimek 《Studia Geophysica et Geodaetica》1966,10(2):235-238

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An electronic apparatus for measuring the kinematic and dynamic properties of elastic waves on seismic models     

Zdeněk Pros  Josef Chalupa 《Studia Geophysica et Geodaetica》1966,10(3):333-341

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Über den Zusammenhang zwischen Konvergenzschranke und Abweichung von der exakten Lösung bei der Relaxation von Poisson- und Helmholtz-Gleichung     

Dr. Josef Egger 《Meteorology and Atmospheric Physics》1970,19(2):129-149

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Celestial Mechanics and Dynamical Astronomy     

Fabian Josef Winterberg  Efi Meletlidou 《Celestial Mechanics and Dynamical Astronomy》2004,88(4):415-420

Volume Contents

Celestial Mechanics and Dynamical Astronomy  相似文献   

Uncertainty, subjectivity, experience: a comparative pilot study     

Thomas Raab  Franz Josef Brosch 《Engineering Geology》1996,44(1-4):129-145

Mean tendencies and variances of ad hoc mean estimates (field estimates) of some engineering geological parameters were compared to statistically obtained reference values. The latter correspond to the “best” estimates in the sense of approximating so-called reality (Einstein and Baecher, 1982. Probabilistic and statistical methods in engineering geology. Problem statement and introduction to solution. Rock Mech., Suppl. 12: 47–61; Einstein and Baecher, 1983. Probabilistic and statistical methods in engineering geology. Specific methods and examples, Part I: Exploration. Rock Mech. Rock Eng., 16: 39–72). The study was carried out by means of a demoscopic field study on 43 engineering geologists. “Professional experience” was examined by comparing the estimation results of two trial groups, one consisting of people with several years of professional experience, the other one consisting of university students. The biases of the ad hoc estimates due to subjectivity and the limitation of working time at the selected reference outcrops follow statistically describable trends and thus can be analyzed by univariate and multivariate methods. Some geological and psychological hypotheses concerning the mean estimation trends, correlations and discriminations are postulated. Implications on commonly used field estimation methods are discussed.  相似文献   

Least squares parameter estimation in chaotic differential equations     

Josef Kallrath  Johannes P. Schlöder  Hans Georg Bock 《Celestial Mechanics and Dynamical Astronomy》1993,56(1-2):353-371

A recent least squares algorithm, which is designed to adapt implicit models to given sets of data, especially models given by differential equations or dynamical systems, is reviewed and used to fit the Hénon-Heiles differential equations to chaotic data sets.This numerical approach for estimating parameters in differential equation models, called theboundary value problem approach, is based on discretizing the differential equations like a boundary value problem,e.g. by a multiple shooting or collocation method, and solving the resulting constrained least squares problem with a structure exploiting generalized Gauss-Newton-Method (Bock, 1981).Dynamical systems like the Hénon-Heiles system which can have initial values and parameters that lead to positive Lyapunov exponents or phase space filling Poincaré maps give rise to chaotic time series. Various scenarios representing ideal and noisy data generated from the Hénon-Heiles system in the chaotic region are analyzedw.r.t. initial conditions, parameters and Lyapunov exponents. The original initial conditions and parameters are recovered with a given accuracy. The Lyapunov spectrum is then computed directly from the identified differential equations and compared to the spectrum of the true dynamics.presently at IWR, Universität Heidelberg, Im Neuenheimer Feld 368, D-6900 Heidelberg, Germany  相似文献   

Gravity Spectra from the Density Distribution of Earth’s Uppermost 435 km     

Josef Sebera  Roger Haagmans  Rune Floberghagen  Jörg Ebbing 《Surveys in Geophysics》2018,39(2):227-244

The Earth masses reside in a near-hydrostatic equilibrium, while the deviations are, for example, manifested in the geoid, which is nowadays well determined by satellite gravimetry. Recent progress in estimating the density distribution of the Earth allows us to examine individual Earth layers and to directly see how the sum approaches the observed anomalous gravitational field. This study evaluates contributions from the crust and the upper mantle taken from the LITHO1.0 model and quantifies the gravitational spectra of the density structure to the depth of 435 km. This is done without isostatic adjustments to see what can be revealed with models like LITHO1.0 alone. At the resolution of 290 km (spherical harmonic degree 70), the crustal contribution starts to dominate over the upper mantle and at about 150 km (degree 130) the upper mantle contribution is nearly negligible. At the spatial resolution \(<150\,\hbox {km},\) the spectra behavior is driven by the crust, the mantle lid and the asthenosphere. The LITHO1.0 model was furthermore referenced by adding deeper Earth layers from ak135, and the gravity signal of the merged model was then compared with the observed satellite-only model GOCO05s. The largest differences are found over the tectonothermal cold and old (such as cratonic), and over warm and young areas (such as oceanic ridges). The misfit encountered comes from the mantle lid where a velocity–density relation helped to reduce the RMS error by 40%. Global residuals are also provided in terms of the gravitational gradients as they provide better spatial localization than gravity, and there is strong observational support from ESA’s satellite gradiometry mission GOCE down to the spatial resolution of 80–90 km.  相似文献   

Correlation between Loess profiles on the basis of mineralogical,malacological, and anthropogenic indicators: A case study from Moravany-Lopata,western Slovakia     

Maciej Pawlikowski  Witold P. Alexandrowicz  Ladislav Banesz  Josef Hromada  Janusz K. Kozlowski  Krzysztof Sobczyk  Barbara Kazior 《Geoarchaeology》1998,13(6):565-594

Moravany-Lopata, located in the complex of sites in the middle Vah basin, dates to the period immediately preceding the LGM. The authors use this site to demonstrate the usefulness of mineralogical, sedimentological, palaeomalacological, and anthropogenic criteria for the correlation of loess profiles. This analysis is especially concerned with sites in loess territories where the loess layers covering archaeological levels are not thick. Such sites occur frequently on the plateaus of the northern part of Central Europe, though they appear most notably in the areas in which the last loess cover, corresponding to the period after the last Pleniglacial and/or Late Glacial postloess sediments, is absent. The archaeological levels dated to before or directly after the LGM occur in the upper portion of the loess, overlain by the Holocene soil. The investigations at the Moravany-Lopata site have confirmed the usefulness of the anthropogenic indicators in the 0.1–1.0 mm fraction for the identification of occupation levels extending even beyond the area of occurrence of macrofinds and evident type structures. On this basis, a relationship could be established between two occupational levels and two ice-wedge generations in the period from 21.4 to 20 ky. Gravettian settlement in western Slovakia seems to have persisted up to the maximum of the LGM. Population groups representing the end of the shouldered points horizon (pointes à cran) appeared in western Slovakia in the intervals between the formation of large networks of ice wedges. The next settlement phase in that territory falls at about 18–17 ky B.P. This is the Epigravettian settlement, which is culturally unrelated to the shouldered points horizon. © 1998 John Wiley & Sons, Inc.  相似文献