139 research outputs found

    Национальная академическая библиография военного времени

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    В статье прослеживается подвижническая работа в годы Великой Отечественной войны коллектива БАН СССР, стремящегося в тяжелейших условиях блокады обеспечить ученых страны научными изданиями, обслужить передвижными библиотечками воинские части, госпитали, производственные предприятия; проводившего выставочную работу, библиографическую деятельность. В частности, воссоздается история подготовки в военные годы библиографического справочника, охватывающего всю издательскую деятельность Академии наук СССР за 1941-1943 гг

    Global chronostratigraphical correlation table for the last 2.7 million years

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    The table provides a correlation of chronostratigraphical subdivisions of late Cenozoic geological time, spanning the last 2.7 million years. The formal division of the Quaternary is the responsibility of the IUGS International Commission on Stratigraphy’s (ICS) Subcommission on Quaternary Stratigraphy (SQS), in partnership with the International Union for Quaternary Research’s (INQUA) Commission on Stratigraphy and Chronology (SACCOM). Previous versions of the chart (see website ) were published as Gibbard et al. 2004, 2005 and Gibbard & Cohen, 2008

    The sedimentology and palaeoecology of the Westleton Member of the Norwich Crag Formation (Early Pleistocene) at Thorington, Suffolk, England

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    Extensive sections in the Thorington gravel quarry complex in eastern Suffolk include the most complete record to date of sedimentary environments of the Westleton Beds Member of the Norwich Crag Formation. New palaeoecological and palaeomagnetic evidence is presented, which confirms that the Member was deposited at or near a gravelly shoreline of the Crag Sea as sea level fluctuated during a climatic ameloriation within or at the end of the Baventian/ pre-Pastonian ‘a’ Stage (Tiglian C4c Substage).</jats:p

    Quaternay geological landscape evolution across borders: linking the Scheldt to Rhine-Thames Land

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    This poster presents paleogeographical scenario maps for the southwestern North Sea Basin, where onshore and offshore territories of Belgium, The Netherlands, France and England meet. Originally prepared and published as a backdrop for paleolithical geoarcheological research (Hijma et al. 2012; JQS), we are now expanding this with fieldwork in NW Belgium. NW Belgium is a key area to resolve current debates on the timing and rates of erosion and landscape change in this area over multiple glacial-interglacial cycles. With the Thames Estuary, it shares a history of drastic river valley network reconfigurations between successive glacials in the youngest 500,000 years. With the SW Netherlands it shares the sea level rise history in Eemian and Holocene. With NW France and SE England, it shares the river incision history that accelerates and changes in position with the opening of the Strait of Dover in the last 500,000 years. What are regionally separated issues in surrounding countries, comes together and superimposes in the Belgian Quaternary record. Our fieldwork aims at logging and sampling for a long-term landscape erosion studies, progressively over multiple glacial-interglacial cycles, and for generic regional quaternary geological mapping and dating

    Formal ratification of subseries for the Pleistocene Series of the Quaternary System

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    The Pleistocene Series/Epoch of the Quaternary System/ Period has been divided unofficially into three subseries/ subepochs since at least the 1870s. On 30th January, 2020, the Executive Committee of the International Union of Geological Sciences ratified two proposals approved by the International Commission on Stratigraphy formalizing: 1) the Lower Pleistocene Subseries, comprising the Gelasian Stage and the superjacent Calabrian Stage, with a base defined by the GSSP for the Gelasian Stage, the Pleistocene Series, and the Quaternary System, and currently dated at 2.58 Ma; and 2) the term Upper Pleistocene, at the rank of subseries, with a base currently undefined but provisionally dated at ~129 ka. Defining the Upper Pleistocene Subseries and its corresponding stage with a GSSP is in progress. The Middle Pleistocene Subseries is defined by the recently ratified GSSP for the Chibanian Stage currently dated at 0.774 Ma. These ratifications complete the official division of the Pleistocene into three subseries/ subepochs, in uniformity with the similarly subdivided Holocene Series/Epoch.</p

    Search for direct production of charginos and neutralinos in events with three leptons and missing transverse momentum in √s = 7 TeV pp collisions with the ATLAS detector

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    A search for the direct production of charginos and neutralinos in final states with three electrons or muons and missing transverse momentum is presented. The analysis is based on 4.7 fb−1 of proton–proton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with Standard Model expectations in three signal regions that are either depleted or enriched in Z-boson decays. Upper limits at 95% confidence level are set in R-parity conserving phenomenological minimal supersymmetric models and in simplified models, significantly extending previous results

    Jet size dependence of single jet suppression in lead-lead collisions at sqrt(s(NN)) = 2.76 TeV with the ATLAS detector at the LHC

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    Measurements of inclusive jet suppression in heavy ion collisions at the LHC provide direct sensitivity to the physics of jet quenching. In a sample of lead-lead collisions at sqrt(s) = 2.76 TeV corresponding to an integrated luminosity of approximately 7 inverse microbarns, ATLAS has measured jets with a calorimeter over the pseudorapidity interval |eta| < 2.1 and over the transverse momentum range 38 < pT < 210 GeV. Jets were reconstructed using the anti-kt algorithm with values for the distance parameter that determines the nominal jet radius of R = 0.2, 0.3, 0.4 and 0.5. The centrality dependence of the jet yield is characterized by the jet "central-to-peripheral ratio," Rcp. Jet production is found to be suppressed by approximately a factor of two in the 10% most central collisions relative to peripheral collisions. Rcp varies smoothly with centrality as characterized by the number of participating nucleons. The observed suppression is only weakly dependent on jet radius and transverse momentum. These results provide the first direct measurement of inclusive jet suppression in heavy ion collisions and complement previous measurements of dijet transverse energy imbalance at the LHC.Comment: 15 pages plus author list (30 pages total), 8 figures, 2 tables, submitted to Physics Letters B. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2011-02

    Search for strong gravity in multijet final states produced in pp collisions at √s=13 TeV using the ATLAS detector at the LHC

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    A search is conducted for new physics in multijet final states using 3.6 inverse femtobarns of data from proton-proton collisions at √s = 13TeV taken at the CERN Large Hadron Collider with the ATLAS detector. Events are selected containing at least three jets with scalar sum of jet transverse momenta (HT) greater than 1TeV. No excess is seen at large HT and limits are presented on new physics: models which produce final states containing at least three jets and having cross sections larger than 1.6 fb with HT > 5.8 TeV are excluded. Limits are also given in terms of new physics models of strong gravity that hypothesize additional space-time dimensions
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