187 research outputs found

    Grain boundary self- and Mn impurity diffusion in equiatomic CoCrFeNi multi-principal element alloy

    Get PDF
    Grain boundary self-diffusion of Co, Cr and Fe and impurity diffusion of Mn are measured in a coarse-grained equiatomic CoCrFeNi multi-principal alloy. The tracer diffusivities are determined in a wide temperature range of 643 K to 1273 K, which encompasses both the C- and B-type kinetic regimes of grain boundary diffusion in polycrystalline materials after Harrison’s classification. At higher temperatures (T>800K)( T > 800 K), only one short-circuit (grain boundary) contribution is observed, while the existence of two distinct contributions is elucidated by thorough analysis of the penetration profiles corresponding to the C-type kinetic regime (643–703 K). The latter observations are explained in terms of a grain boundary phase decomposition after prolonged annealing below 700 K. The product of the segregation factor and the grain boundary width is found to be about 0.5 nm for all constituting elements. The grain boundary diffusion data indicate that Mn does not reveal a strong (if any) segregation in the equiatomic CoCrFeNi alloy

    Genome Sequence of Verrucomicrobium sp. Strain GAS474, a Novel Bacterium Isolated from Soil

    Get PDF
    Verrucomicrobium sp. strain GAS474 was isolated from the mineral soil of a temperate deciduous forest in central Massachusetts. Here, we present the complete genome sequence of this phylogenetically novel organism, which consists of a total of 3,763,444 bp on a single scaffold, with a 65.8% GC content and 3,273 predicted open reading frames

    Genome sequence of <i>Oceanicola</i> sp. strain MCTG156(1a) isolated from a Scottish coastal phytoplankton net sample

    Get PDF
    ABSTRACT Oceanicola sp. strain MCTG156(1a) was isolated from a phytoplankton net sample collected on the west coast of Scotland and selected based on its ability to degrade polycyclic aromatic hydrocarbons. Here, we present the genome sequence of this strain, which comprises 3,881,122 bp with 3,949 genes and an average G+C content of 62.7%. </jats:p

    Genome sequence of <i>Arenibacter algicola</i> strain TG409, a hydrocarbon-degrading bacterium associated with marine eukaryotic phytoplankton

    Get PDF
    Arenibacter algicola strain TG409 was isolated from Skeletonema costatum and exhibits the ability to utilize polycyclic aromatic hydrocarbons as sole sources of carbon and energy. Here, we present the genome sequence of this strain, which is 5,550,230 bp with 4,722 genes and an average G+C content of 39.7%

    Charge Transfer Characteristics of n-type In0.1Ga0.9N Photoanode across Semiconductor-Liquid Interface

    Get PDF
    Understanding the mechanisms of charge transfer across the semiconductor/liquid interface is crucial to realize efficient photoelectrochemical devices. Here, the interfacial charge transfer characteristics of n-type In0.1Ga0.9N photoanodes are investigated and correlated to their photo-activity properties measured in phosphate buffered saline solution (pH 7) under illumination conditions. Cyclic voltammetry measurements show evident photoactivity changes as the number of cycles increases. In particular, the photocurrent density reaches its maximum value after 49 voltammetric cycles; meanwhile, the photocurrent onset potential shifts toward more negative cathodic potentials. Electrochemical impedance measurements reveal that, first, the hole transfer process occurs mainly via localized states at the surface and the photocurrent onset potential is dependent on the energetic position of those states. Therefore, the observed initial photocurrent increase and cathodic shift of the photocurrent onset potential can be attributed to a decrease of the transfer resistance and partial passivation of the states at the surface. On the other hand, a gradual oxidation and corrosion of the InGaN surface arises, causing a consequential decrease of the photocurrent. At this point, the charge transfer process occurs predominantly from the valence band. This work provides a basic understanding of the charge transfer mechanisms across the InGaN/liquid interface which can be used to improve the overall photoanode efficiency

    Zum Leistungs- und Entwicklungsstand von 2010 eingeschulten Schüler*innen auf Rügen und in Stralsund in den Schuljahren 2018/19 und 2019/20

    Get PDF
    Seit 2010 wird das am Response to Intervention-Ansatz ausgerichtete, inklusive Beschulungskonzept Rügener Inklusionsmodell (RIM) flächendeckend in den Grundschulen der Insel Rügen umgesetzt. Im Rahmen eines quasi-experimentellen Feldversuchs wurde das Konzept umfassend evaluiert. Mit Übertritt in die Sekundarstufe in 2014 wurden die Schüler*innen des Pilotjahrgangs nicht mehr nach den RIM-Strukturen unterrichtet und gefördert, sondern in einem daran angelehnten Rahmen. Im Kontext einer begleitenden Forschung konnte gezeigt werden, dass durchaus verschiedene Konzeptelemente des RTI-Ansatzes – wenngleich nicht in der avisierten Qualität und Quantität – auch in den Rügener Regionalen Schulen realisiert und Fördererfolge bei einzelnen Schüler*innen mit festgestellten (sonder-)pädagogischen Förderbedarfen erzielt wurden. Jedoch konnten auch Fälle mit keinen oder gar rückläufigen Entwicklungsverläufen aufgezeigt werden, welche entsprechend nicht adäquat von den realisierten Förderstrukturen profitieren konnten. In der vorliegenden Studie werden die schulischen Leistungs- und Entwicklungsstände der Schüler*innen des Pilotjahrgangs zum RIM sowie der ehemaligen Kontrollgruppe der Hansestadt Stralsund am Ende der neunten Klasse vergleichend analysiert. Neben Vergleichen in den Gesamtkohorten lag ein besonderer Fokus auf Schüler*innen mit ungünstigen schulischen Voraussetzungen in den Bereichen Lernen, emotionale-soziale Entwicklung und Sprache
    corecore