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Search Results: 1 - 10 of 3162 matches for " Joachim Voss "
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Environmental changes in the central Baltic Sea during the past 1000 years: inferences from sedimentary records, hydrography and climate
Thomas Leipe,Joachim W. Dippner,Sven Hille,Maren Voss
Oceanologia , 2008,
Abstract: Short sediment cores from the eastern Gotland Basin were investigated using a multi-proxy approach in order to reconstruct the environmental conditions of the area during the past 1000 years. Sediment data and facies were discussed in relation to hydrographic features (salinity, oxygen) and climate change. During the medieval warm period (MWP), from about 900 to 1250 AD, the hydrographic and environmental conditions were similar to those of the present time (modern warm period, since about 1850): a temporally stable halocline, caused by regular saline water inflows from the North Sea, prevents vertical mixing and leads to bottom water anoxia and the deposition of laminated, organic-rich sapropels. During the period from about 1250 to 1850, referred to as the cold phase (including the Little Ice Age), the environmental conditions of the central Baltic Sea were distinctly different: the lower salinity, resulting from reduced North Sea water inflows, allowed vertical convection of the water column and long-term stable ventilation of the sea bed (oxic stage). Both the productivity of the planktonic ecosystem as well as the preservation of organic matter in the sediments improved during the warm periods. The anthropogenic impact can be identified within the recent laminated sequence by a temporal reconstruction of pollutant deposition. Our findings imply a climate-change driven shift in the environmental conditions and the ecosystem of the Baltic from the north to the south and back to the north.
Nursing and midwifery regulation and HIV scale-up: establishing a baseline in east, central and southern Africa
Carey F McCarthy,Joachim Voss,Andre R Verani,Peggy Vidot
Journal of the International AIDS Society , 2013, DOI: 10.7448/ias.16.1.18051
Abstract: Introduction: Shifting HIV treatment tasks from physicians to nurses and midwives is essential to scaling-up HIV services in sub-Saharan Africa. Updating nursing and midwifery regulations to include task shifting and pre-service education reform can help facilitate reaching new HIV targets. Donor-supported initiatives to update nursing and midwifery regulations are increasing. However, there are gaps in our knowledge of current practice and education regulations and a lack of information to target and implement regulation strengthening efforts. We conducted a survey of national nursing and midwifery councils to describe current nursing and midwifery regulations in 13 African countries. Methods: A 30-item survey was administered to a convenience sample of 13 national nursing and midwifery regulatory body leaders in attendance at the PEPFAR-supported African Health Profession Regulatory Collaborative meeting in Nairobi, Kenya on 28 February, 2011. The survey contained questions on task shifting and regulations such as registration, licensure, scope of practice, pre-service education accreditation, continuing professional development and use of international guidelines. Survey data were analyzed to present country-level, comparative and regional findings. Results: Task shifting to nurses and midwives was reported in 11 of the 13 countries. Eight countries updated their scope of practice within the last five years; only one reported their regulations to reflect task shifting. Countries vary with regard to licensure, pre-service accreditation and continuing professional development regulations in place. There was no consistency in terms of what standards were used to design national practice and education regulations. Discussion: Many opportunities exist to assist countries to modernise regulations to incorporate important advancements from task shifting and pre-service reform. Appropriate, revised regulations can help sustain successful health workforce strategies and contribute to further scale-up HIV services and other global health priorities. Conclusions: This study provides fundamental information from which to articulate goals and to measure the impact of regulation strengthening efforts.
Optical Imaging of Retinotopic Maps in a Small Songbird, the Zebra Finch
Nina Keary,Joe Voss,Konrad Lehmann,Hans-Joachim Bischof,Siegrid L?wel
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0011912
Abstract: The primary visual cortex of mammals is characterised by a retinotopic representation of the visual field. It has therefore been speculated that the visual wulst, the avian homologue of the visual cortex, also contains such a retinotopic map. We examined this for the first time by optical imaging of intrinsic signals in zebra finches, a small songbird with laterally placed eyes. In addition to the visual wulst, we visualised the retinotopic map of the optic tectum which is homologue to the superior colliculus in mammals.
Oscillating magnetic field disrupts magnetic orientation in Zebra finches, Taeniopygia guttata
Nina Keary, Tim Ruploh, Joe Voss, Peter Thalau, Roswitha Wiltschko, Wolfgang Wiltschko, Hans-Joachim Bischof
Frontiers in Zoology , 2009, DOI: 10.1186/1742-9994-6-25
Abstract: In a setup that eliminates all directional cues except the geomagnetic field zebra finches were trained to search for food in the magnetic north/south axis. The birds were then tested for orientation performance in two magnetic conditions. In condition 1 the horizontal component of the geomagnetic field was shifted by 90 degrees using a helmholtz coil. In condition 2 a high frequently oscillating field (1.156 MHz) was applied in addition to the shifted field. Another group of birds was trained to solve the orientation task, but with visual landmarks as directional cue. The birds were then tested for their orientation performance in the same magnetic conditions as applied for the first experiment.The zebra finches could be trained successfully to orient in the geomagnetic field for food search in the north/south axis. They were also well oriented in test condition 1, with the magnetic field shifted horizontally by 90 degrees. In contrast, when the oscillating field was added, the directional choices during food search were randomly distributed. Birds that were trained to visually guided orientation showed no difference of orientation performance in the two magnetic conditions.The results indicate that zebra finches use a receptor that bases on radical pair processes for sensing the direction of the earth magnetic field in this short distance orientation behavior.The use of the earth magnetic field for spatial orientation has been shown for various animals over the last years. Among the vertebrates, a magnetic compass has been demonstrated in fish [1,2], amphibians [3], reptiles [4] and mammals [5-7]. Birds, however, is by far the best studied group where magnetic orientation is concerned (for review, see [8]). Migratory birds use the magnetic compass sense for finding the migratory direction [9]. Non migratory birds like pigeons (Columba livia f. domestica) use it to find the direction towards their home loft [10], and domestic chickens (Gallus gallus) [11,12] and ze
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.
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