Конкурс на здобуття премії за видатні результати, одержані російськими та українськими вченими при проведенні спільних досліджень

Національна академія наук України (НАН України) і Російська академія наук (РАН) оголошують конкурс на здобуття премії за видатні результати, одержані російськими та українськими вченими при проведенні спільних досліджень у галузі природничих, техніч- них, гуманітарних і суспільних наук, які мають важливе наукове і практичне значення. Присудження премії буде здійснено в 2012 році

Протоирей Сергий Булгаков в Крыму: жизнь, труды, изгнание

Silicon isotopes have considerable potential as proxy for (near-) surface processes and environmental conditions. However, unambiguous interpretations of isotope signatures in natural silica deposits are often hampered by a lack of independent quantitative information on isotopic fractionations operating under the environmental conditions of interest. We performed seeded silica precipitation experiments using flow-through reactors in the 10-60. °C temperature range to alleviate this problem. The principal objective was to quantify the silicon isotope fractionations during controlled precipitation of amorphous silica from a flowing aqueous solution. The experiments were designed to simulate silica deposition induced by a temperature drop, with particular relevance for (near-) surface hydrothermal systems associated with steep temperature gradients. Monitored differences in silicon isotope ratios

Street-Art - eine verlockende Utopie

In diesem Artikel werden die Prämissen der Street-Art angesprochen, die dazu anregen die Funktion und Bewertungshierarchien von Kunst im öffentlichen Raum neu zu überdenken. Nicht der künstlerische Wille des Senders einer Botschaft steht im Mittelpunkt, sondern die Sicht des Konsumenten derselben wird thematisiert. Welche Strategien der von Jean Baudrillard beschriebenen "Semiokratie" entgegenstehen könnten, wird dargestellt

Rifting under steam – how rift magmatism triggers methane venting from sedimentary basins

During opening of a new ocean magma intrudes into the surrounding sedimentary basins. Heat provided by the intrusions matures the host rock creating metamorphic aureoles potentially releasing large amounts of hydrocarbons. These hydrocarbons may migrate to the seafloor in hydrothermal vent complexes in sufficient volumes to trigger global warming, e.g. during the Paleocene Eocene Thermal Maximum (PETM). Mound structures at the top of buried hydrothermal vent complexes observed in seismic data off Norway were previously interpreted as mud volcanoes and the amount of released hydrocarbon was estimated based on this interpretation. Here, we present new geophysical and geochemical data from the Gulf of California suggesting that such mound structures could in fact be edifices constructed by the growth of black-smoker type chimneys rather than mud volcanoes. We have evidence for two buried and one active hydrothermal vent system outside the rift axis. The vent releases several hundred degrees Celsius hot fluids containing abundant methane, mid-ocean-ridge-basalt (MORB)-type helium, and precipitating solids up to 300 m high into the water column. Our observations challenge the idea that methane is emitted slowly from rift-related vents. The association of large amounts of methane with hydrothermal fluids that enter the water column at high pressure and temperature provides an efficient mechanism to transport hydrocarbons into the water column and atmosphere, lending support to the hypothesis that rapid climate change such as during the PETM can be triggered by magmatic intrusions into organic-rich sedimentary basins