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Now showing items 1 - 16 of 578042

  • Cluster rotational bands in <sup>11sup> B

    Danilov, A.N.; Demyanova, A.S.; Ogloblin, A.A.; Belyaeva, T.L.; Goncharov, S.A.; Trzaska, W.; Greco, V.; La Cognata, M.; Pirrone, S.; Rizzo, F.; Spitaleri, C.  

    Differential cross-sections of B-11+alpha inelastic scattering at E(alpha) 65 MeV leading to most of the known B-11 states at excitation energies up to 14 MeV were measured [1]. The data analysis was done using Modified diffraction model (MDM) [2] allowing determining radii of excited states. Radii of the states with excitation energies less than similar to 7 MeV coincide with the radius of the ground state with an accuracy not less than 0.1 - 0.15 fm. This result is consistent with traditional view on shell structure of low-lying states in B-11. Most of the observed high-energy excited states are distributed among four rotational bands. Moments of inertia of band states are close to the moment of inertia of the Hoyle state of C-12. The calculated radii, related to these bands, are 0.7 - 1.0 fm larger than the radius of the ground state, and are close to the Hoyle state radius. These results are in agreement with existing predictions about various cluster structure of B-11 at high excitation energies.
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  • PB<sup>+sup>-Tree: PCM-Aware B<sup>+sup>-Tree

    Choi, Gyu Sang; On, Byung-Won; Lee, Ingyu  

    Phase change memory (PCM) is non-volatile memory that is byte-addressable. It is two to four times denser than DRAM, orders of magnitude better than NAND Flash memory in read latency, and 10 times better than NAND Flash memory in write endurance. However, it still limits the number of write operations to at most 10(6) times per PCM cell. To extend its lifetime, it is necessary to evenly distribute write operations over all the memory cells. Up to now, the B+-Tree index structure has been used to quickly locate a search key in a relational database management system (RDBMS). All the record keys in each node are sorted and packed upon insertion in, and deletion from, the B+-Tree. In addition, a counter keeps track of the number of valid keys in the B+-Tree. Consequently, a B+-Tree algorithm results in a large number of write operations, which deteriorates the endurance of PCM. This restricts the usage of PCM on a database server and deteriorates performance of database servers. In this paper, we propose a novel PCM-aware B+-Tree index structure, called PB+-Tree, to provide wear-leveling in PCM. According to our experiment results, PB+-Tree is much faster than the existing B+-Tree algorithms for PCM and NAND Flash memory with versatile workloads. More importantly, our scheme also greatly reduces the number of write operations compared to other B+-Tree algorithms. All of these results suggest that PB+-Tree is the B+-Tree algorithm best fitted to PCM.
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  • PB<sup>+sup>-Tree: PCM-Aware B<sup>+sup>-Tree

    Choi, Gyu Sang   On, Byung-Won   Lee, Ingyu  

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  • Ethnopharmacology <sup>†sup>

    Taylor, David M.   Werneke, Ursula  

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    The present invention relates to an inflatable stand up paddle (SUP) board that has a separate air chamber formed therein in addition to a tube that forms a main body, thereby achieving more enhanced safety, and conforms to national safety regulations. The SUP board comprises: a main body that is formed in the shape of a long plate and has a plurality of shape maintaining lines, each having opposite ends coupled to upper and lower internal surfaces, and a first air injection port installed on the front side of the upper surface thereof; a side sheet air-tightly bonded to the main body along the outer periphery thereof to form an air tube along with the main body; and an inner tube that is provided on the outer periphery of the main body and has a second air injection port installed on the outer surface of the side sheet to allow air to be injected thereinto, wherein the outer surface of the inner tube is attached to the internal surface of the side sheet.
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  • Pathophysiology of Intestinal Na<sup>+sup>/H<sup>+sup> Exchange

    Michael A. Gurney   Daniel Laubitz   Fayez K. Ghishan   Pawel R. Kiela  

    Several members of the SLC9A family of Na + /H + exchangers are expressed in the gut, with varying expression patterns and cellular localization. Not only do they participate in the regulation of basic epithelial cell functions, including control of transepithelial Na + absorption, intracellular pH (pH i ), cell volume, and nutrient absorption, but also in cellular proliferation, migration, and apoptosis. In addition, they modulate the extracellular milieu to facilitate other nutrient absorption and to regulate the intestinal microbial microenvironment. Na + /H + exchangers are frequent targets of inhibition in gastrointestinal pathologies, either by intrinsic factors (eg, bile acids, inflammatory mediators) or infectious agents and associated microbial toxins. Based on emerging evidence, disruption of Na + /H + exchange activity via impaired expression or function of respective isoforms may contribute not only to local and systemic electrolyte imbalance, but also to the disease severity via multiple mechanisms. Here, we review the current state of knowledge about the roles Na + /H + exchangers play in the pathogenesis of disorders of diverse origin and affecting a range of gastrointestinal tissues.
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  • Cluster states in <sup>11sup> B

    Danilov, A.N.; Demyanova, A.S.; Ogloblin, A.A.; Dmitriev, S.V.; Belyaeva, T.L.; Goncharov, S.A.; Gurov, Yu.B.; Maslov, V.A.; Sobolev, Yu.G.; Trzaska, W.; Khlebnikov, S.V.; Burtebaev, N.; Zholdybayev, T.; Saduyev, N.; Heikkinen, P.; Julin, R.; Tyurin, G.P.; Lunardi, S.; Bizzeti, P.G.; Bucci, C.; Chiari, M.; Dainese, A.; Di Nezza, P.; Menegazzo, R.; Nannini, A.; Signorini, C.; Valiente-Dobon, J.J.  

    The differential cross-sections of the elastic and inelastic B-11 + alpha scattering was measured at E(alpha) = 65 MeV. The analysis of the data by Modified diffraction model (MDM) showed that the RMS radii of the B-11 state 3/2(-), E* = 8.56 MeV is similar to 0.6 fm larger than that of the ground state. The 12.56 MeV state was not observed contrary to the predictions of the a-condensate model. The 13.1 MeV state was excited with the angular momentum transfer L = 4 confirming its belonging to the rotational band with the 8.56 MeV state as a head.
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  • <sup>8sup> B structure in Fermionic Molecular Dynamics

    Henninger, K R; Neff, T; Feldmeier, H  

    The structure of the light exotic nucleus B-8 is investigated in the Fermionic Molecular Dynamics (FMD) model. The decay of B-8 is responsible for almost the entire high-energy solar-neutrino flux, making structure calculations of B-8 important for determining the solar core temperature. B-8 is a proton halo candidate thought to exhibit clustering. FMD uses a wave-packet basis and is well-suited for modelling clustering and halos. For a multiconfiguration treatment we construct the many-body Hilbert space from antisymmetrised angular-momentum projected 8-particle states. First results show formation of a proton halo.
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  • T-Bet<sup>+sup> IgM Memory Cells Generate Multi-lineage Effector B Cells

    Kevin J. Kenderes   Russell C. Levack   Amber M. Papillion   Berenice Cabrera-Martinez   Lisa M. Dishaw   Gary M. Winslow  

    Summary Immunoglobulin M (IgM) memory cells undergo differentiation in germinal centers following antigen challenge, but the full effector cell potential of these cells is unknown. We monitored the differentiation of enhanced yellow fluorescent protein (eYFP)-labeled CD11c + and CD11cneg T-bet + IgM memory cells after their transfer into naive recipient mice. Following challenge infection, many memory cells differentiated into IgM-producing plasmablasts. Other donor B cells entered germinal centers, downregulated CD11c, underwent class switch recombination, and became switched memory cells. Yet other donor cells were maintained as IgM memory cells, and these IgM memory cells retained their multi-lineage potential following serial transfer. These findings were corroborated at the molecular level using immune repertoire analyses. Thus, IgM memory cells can differentiate into all effector B cell lineages and undergo self-renewal, properties that are characteristic of stem cells. We propose that these memory cells exist to provide long-term multi-functional immunity and act primarily to maintain the production of protective antibodies. Graphical Abstract Highlights • T-bet + IgM memory cells are generated in response to ehrlichial infection • The memory cells can generate all effector B cell populations and self-renew • Multi-lineage potential is a property of single cells • The memory cells act to maintain long-term neutralizing antibodies T-bet + B cells have now been identified in a wide range of immunological contexts. Using a model bacterial infection, Kenderes et al. show that single T-bet + IgM memory cells exhibit multi-lineage potential and can undergo self-renewal, both properties of stem cells.
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  • <sup>​40sup>Ar/<sup>39sup>Ar geochronology of terrestrial pyroxene

    Bryant Ware   Fred Jourdan  

    Abstract Geochronological techniques such as U/Pb in zircon and baddeleyite and 40 Ar/ 39 Ar on a vast range of minerals, including sanidine, plagioclase, and biotite, provide means to date an array of different geologic processes. Many of these minerals, however, are not always present in a given rock, or can be altered by secondary processes (e.g. plagioclase in mafic rocks) limiting our ability to derive an isotopic age. Pyroxene is a primary rock forming mineral for both mafic and ultramafic rocks and is resistant to alteration process but attempts to date this phase with 40 Ar/ 39 Ar has been met with little success so far. In this study, we analyzed pyroxene crystals from two different Large Igneous Provinces using a multi-collector noble gas mass spectrometer (ARGUS VI) since those machines have been shown to significantly improve analytical precision compared to the previous single-collector instruments. We obtain geologically meaningful and relatively precise 40 Ar/ 39 Ar plateau ages ranging from 184.6 ± 3.9 to 182.4 ± 0.8 Ma (2 σ uncertainties of ±1.8–0.4%) and 506.3 ± 3.4 Ma for Tasmanian and Kalkarindji dolerites, respectively. Those data are indistinguishable from new and/or published U-Pb and 40 Ar/ 39 Ar plagioclase ages showing that 40 Ar/ 39 Ar dating of pyroxene is a suitable geochronological tool. Scrutinizing the analytical results of the pyroxene analyses as well as comparing them to the analytical result from plagioclase of the same samples indicate pure pyroxene was dated. Numerical models of argon diffusion in plagioclase and pyroxene support these observations. However, we found that the viability of 40 Ar/ 39 Ar dating approach of pyroxene can be affected by irradiation-induced recoil redistribution between thin pyroxene exsolution lamellae and the main pyroxene crystal, hence requiring careful petrographic observations before analysis. Finally, diffusion modeling show that 40 Ar/ 39 Ar of pyroxene can be used as a powerful tool to date the formation age of mafic rocks affected by greenschist metamorphism and will likely play an important role in high temperature thermochronology.
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  • Entangled <sup>1sup>

    Lapadat, Judith C.  

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  • CoVaR <sup>†sup>

    Adrian, Tobias; Brunnermeier, Markus K.  

    We propose a measure of systemic risk, Delta CoVaR, defined as the change in the value at risk of the financial system conditional on an institution being under distress relative to its median state. Our estimates show that characteristics such as leverage, size, maturity mismatch, and asset price booms significantly predict Delta CoVaR. We also provide out-of-sample forecasts of a countercyclical, forward-looking measure of systemic risk, and show that the 2006:IV value of this measure would have predicted more than one-third of realized Delta CoVaR during the 2007-2009 financial crisis.
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  • VIS <sup>3sup> COS

    Paulino-Afonso, Ana   Sobral, David   Darvish, Behnam   Ribeiro, Bruno   Smail, Ian   Best, Philip   Stroe, Andra   Cairns, Joseph  

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  • Tending-toward-Blackness <sup>*sup>

    Copeland, Huey  

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  • Introduction <sup>†sup>

    Corradetti, Claudio  

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  • Variance stabilizing filters <sup>#sup>

    Gustafsson, Oskar   Stockhammar, Pär  

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