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Search Results: 1 - 10 of 357 matches for " Voss "
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Locating real eigenvalues of a spectral problem in fluid-solid type structures
Heinrich Voss
Journal of Applied Mathematics , 2005, DOI: 10.1155/jam.2005.37
Abstract: Exploiting minmax characterizations for nonlinear and nonoverdamped eigenvalue problems, we prove the existence of a countable set of eigenvalues converging to ∞ and inclusion theorems for a rational spectral problem governing mechanical vibrations of a tube bundle immersed in an incompressible viscous fluid. The paper demonstrates that the variational characterization of eigenvalues is a powerful tool for studying nonoverdamped eigenproblems, and that the appropriate enumeration of the eigenvalues is of predominant importance, whereas the natural ordering of the eigenvalues may yield false conclusions.
Cenozoic stratigraphy of the southern Salar de Antofalla region, northwestern Argentina
Voss,Reno;
Revista geológica de Chile , 2002, DOI: 10.4067/S0716-02082002000200002
Abstract: in the region of the southern salar de antofalla (catamarca province, northwestern argentina), late eocene to pliocene/(?)pleistocene successions are exposed with thicknesses of up to 1,600 m. they consist of fluvial, lacustrine and eolian sediments with intercalations of pyroclastic rocks and lava flows. the sedimentary deposits represent 'alluvial fan-playa-complexes' accumulated under a semi-arid to arid climate. from the late eocene to the early miocene, the sedimentation took place in broken-foreland basins, while from the early miocene to the late pliocene/(?)early pleistocene, the sediments mainly accumulated within compressional retroarc basins in which volcanoes partly formed additional basin boundaries. seven stratigraphic units can be differentiated on the basis of different lithofacies, angular unconformities and different regional distributions: the late eocene to early miocene qui?oas formation, which can be subdivided into the campo negro member, the cadillo member and the aguada member, the early/(?)middle miocene potrero grande formation, the late miocene antofalla formation, which can be subdivided into the cajeros member and bordo blanco member, the late miocene salina beds, the late miocene pozuelos formation (orilla member), the (?)late miocene/early pliocene sijes formation (uncal grande member) and the late pliocene/(?)early pleistocene singuel formation (agua escondida member). while the qui?oas formation, the potrero grande formation, the antofalla formation and the salina beds have been newly introduced, the strata which represent the other formations can be assigned to the existing stratigraphic division of the southern puna. owing to the fact that these strata had no lateral connection to the strata of their type localities, which crop out near the salar pastos grandes, they were defined as lateral members
Mazeppa-Maseppa: Migration of a Romantic motif
T Voss
Tydskrif vir letterkunde , 2012,
Abstract: Mazeppa (1640–1710), The Ukrainian leader and folk-hero, has a controversial history, and a distinct presence in literature and the graphic arts. Byron’s poem (1819) of the legendary figure’s “wild ride” released a mythical energy which absorbed certain French poets and painters of the 19th century. While the Russian tradition, at least from Pushkin’s Poltava (1828), reworked the historical Ukrainian hetman from a Tsarist and nationalist perspective, the myth of the Western Romantic Mazeppa is best realised by Delacroix, perhaps in anticipation of the displacement of the horse by Faustian technology. Mazeppa becomes a Romantic Phaethon, shifted from the transcendent to the mundane, from a vertical to a horizontal trajectory. Early in the century Mazeppa had also become a figure and theme of popular spectacle and literature, incorporated by the common imagination into politics, journalism and folklore, coming to terms with a new Faustian context. A small group of poets of the 1920s and 1930s return in different Modernist ways to the theme. The coda of this selective survey is sounded in South Africa.
The vulnerable can't speak. An integrative vulnerability approach to disaster and climate change research
Martin Voss
Behemoth : a Journal on Civilisation , 2008,
Abstract: This article discusses a vulnerability approach to disaster research and research on climate change adaptation.As an integrated approach, it claims to consider social, economic and ecological factors. A hypothesis is debated in which the vulnerability of a reference unit (humans, community, ecosystem, etc.) is highly dependent on the degree of influence the unit can exert on its relevant conditions for subsistence. The ability to influence theses conditions depends, to a large extent, on discursive factors. To emphasise this special determinant of vulnerability, the term “participative capacity” is proposed.
'... speak that I may see thee': bushmen, bleek, language and race in South Africa
Tony Voss
Kronos (Bellville) , 2010,
Abstract: In historiography and folklore the Bushmen are South Africa's autochthonous founders, and the Bleek archive is a key document in the country's ongoing attempts to forge an identity. Representing Bushmen offers a critique of this enterprise, but the central argument of Shane Moran's book is that hierarchical ideas of language and its history have been central to the genesis of racial attitudes in South Africa. Bleek was a linguist before he was an ethnographer and Moran gives a careful account of Bleek's On the Origin of Language and of the global context of Bleek's scholarship. Invoking the broadest humane perspective, requiring the closest attention to textual detail and facing up to the evasions and disappointments of early twentieth-century South Africa, Moran's book concludes with a recognition that we have room for action and grounds for hope.
20 years of AELFE: LSP, and language learning and teaching in Higher Education - Some personal reflections from Germany
Bernd Voss
Ibérica , 2012,
Abstract: In this paper I share some more personal views on language learning and teaching in Higher Education in Germany to see how Languages for Specific Purposes (LSP) has fared there in my experience over the years, to comment on some over-exposed versus neglected issues in our field, and hoping that these more personal observations may trigger off some reactions and reflections by readers on their own backgrounds and situations.
Cenozoic stratigraphy of the southern Salar de Antofalla region, northwestern Argentina
Reno Voss
Revista geológica de Chile , 2002,
Abstract: In the region of the southern Salar de Antofalla (Catamarca Province, northwestern Argentina), Late Eocene to Pliocene/(?)Pleistocene successions are exposed with thicknesses of up to 1,600 m. They consist of fluvial, lacustrine and eolian sediments with intercalations of pyroclastic rocks and lava flows. The sedimentary deposits represent 'alluvial fan-playa-complexes' accumulated under a semi-arid to arid climate. From the Late Eocene to the Early Miocene, the sedimentation took place in broken-foreland basins, while from the Early Miocene to the Late Pliocene/(?)Early Pleistocene, the sediments mainly accumulated within compressional retroarc basins in which volcanoes partly formed additional basin boundaries. Seven stratigraphic units can be differentiated on the basis of different lithofacies, angular unconformities and different regional distributions: the Late Eocene to Early Miocene Qui oas Formation, which can be subdivided into the Campo Negro Member, the Cadillo Member and the Aguada Member, the Early/(?)Middle Miocene Potrero Grande Formation, the Late Miocene Antofalla Formation, which can be subdivided into the Cajeros Member and Bordo Blanco Member, the Late Miocene Salina beds, the Late Miocene Pozuelos Formation (Orilla Member), the (?)Late Miocene/Early Pliocene Sijes Formation (Uncal Grande Member) and the Late Pliocene/(?)Early Pleistocene Singuel Formation (Agua Escondida Member). While the Qui oas Formation, the Potrero Grande Formation, the Antofalla Formation and the Salina beds have been newly introduced, the strata which represent the other formations can be assigned to the existing stratigraphic division of the southern Puna. Owing to the fact that these strata had no lateral connection to the strata of their type localities, which crop out near the Salar Pastos Grandes, they were defined as lateral members Estratigrafía del Cenozoico en la región sur del Salar de Antofalla, noroeste de Argentina. En la parte sur del Salar de Antofalla (Provincia de Catamarca; noroeste de Argentina) afloran sedimentitas continentales de edad eocena tardío a plio-pleistocena con espesores de hasta 1.600 m. Están compuestas por materiales aluviales, lacustres, eólicos e intercalaciones de lavas y rocas piroclásticas. Las sedimentitas continentales representan complejos de abanicos aluviales y depósitos de playa acumulados bajo condiciones climáticas áridas y semiáridas. Desde el Eoceno Tardío al Mioceno Temprano la sedimentación se desarrolló en cuencas de antepaís desmembradas, mientras que a partir del Mioceno Temprano al Plioceno Tardío-Pleist
Radioactive and kinematic tracers of feedback from massive stars
Voss R.
EPJ Web of Conferences , 2012, DOI: 10.1051/epjconf/20121910004
Abstract: The mixing of ejecta from young stars into the interstellar medium is an important process in the interplay between star formation and galaxy evolution. A unique window into these processes is provided by the radioactive isotopes 26Al, traced by its γ-ray decay lines at 1.8 MeV. With a mean lifetime of ~ 1 Myr it is a long-term tracer of nucleosynthesis for massive stars. Our population synthesis code models the ejection of 26Al, together with the 60Fe, the kinetic energy and UV radiation for a population of massive stars. We have applied the code to study the nearby Orion region and the more massive Carina region and found good agreement with observational constraints.
Binary Evolution Constraints from Luminosity Functions of LMXBs
R. Voss
Physics , 2011, DOI: 10.1063/1.3536396
Abstract: The formation and evolution of low-mass X-ray binaries (LMXBs) is not well understood. The properties of a population of LMXBs depend on a number of uncertain aspects of binary evolution, and population studies offers a relatively new way of probing binary interactions. We have studied the shape of the faint end of the X-ray luminosity function (LF) of LMXBs in nearby galaxies with Chandra and in the Milky Way using the Swift all-sky monitor. We find a clear difference between the LF of LMXBs in globular clusters (GCs) and those outside, with a relative lack of faint GC sources. This indicates a difference in the composition of the two populations.
The Effect of Finite Element Discretisation on the Stationary Distribution of SPDEs
Jochen Voss
Mathematics , 2011, DOI: 10.4310/CMS.2012.v10.n4.a6
Abstract: This article studies the effect of discretisation error on the stationary distribution of stochastic partial differential equations (SPDEs). We restrict the analysis to the effect of space discretisation, performed by finite element schemes. The main result is that under appropriate assumptions the stationary distribution of the finite element discretisation converges in total variation norm to the stationary distribution of the full SPDE.
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