1,032 research outputs found

    The Book of Ezekiel

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    The book of the prophet Ezekiel : critical edition of the Hebrew text / with notes by C.H. Toy.https://scholar.csl.edu/ebooks/1008/thumbnail.jp

    A multipolymer system for organocatalytic alcohol oxidation

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    A system involving two polymer-supported reagents for the selective and organocatalytic oxidation of alcohols to aldehydes or ketones has been developed in which both polymeric reagents can be recovered and reused. © The Royal Society of Chemistry 2005.postprin

    Polystyrene-supported triphenylarsines: Useful ligands in palladium-catalyzed aryl halide homocoupling reactions and a catalyst for alkene epoxidation using hydrogen peroxide

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    The utility of both soluble (non-cross-linked) and insoluble (cross-linked) polystyrene-supported triphenylarsine reagents were examined. These reagents were prepared by standard radical polymerization methodology and used in palladium-catalyzed homocoupling reactions of aryl halides. The insoluble reagent was also used as a catalyst precursor in heterogeneous alkene epoxidation reactions in which aqueous hydrogen peroxide was the stoichiometric oxidant. For the aryl halide homocoupling reactions, both reagents worked well and afforded similar results. Unhindered aryl iodides afforded the best yields in the shortest reaction times compared to aryl bromides. The epoxidation reactions of unfunctionalized alkenes were not very efficient. This was probably due to the hydrophobicity of the polystyrene matrix, which did not swell in the reaction medium. Thus, since a microporous, gel-type polystyrene matrix was used, the majority of the arsine groups were inaccessible to the reaction components and therefore incapable of participating in catalysis. © 2005 Elsevier Ltd. All rights reserved.postprin

    Estate Planning Session

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    Promoção da leitura em crianças com défice cognitivo

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    O projecto de trabalho que apresentamos tenta dar resposta a alguns dos principais objectivos do Plano Nacional de Leitura, centrando-se na intervenção em contextos nĂŁo formais com crianças com necessidades educativas especiais. Tendo como base a investigação das Ășltimas dĂ©cadas sobre o desenvolvimento da literacia junto desta população e, muito particularmente, a metodologia para a aprendizagem da leitura em crianças com Sindroma de Down de Troncoso e del Cerro (2004), uma equipa interdisciplinar de professores da ESECB dinamizou, durante trĂȘs anos, um Clube/ AteliĂȘ de Leitura com crianças e adolescentes com dĂ©fice cognitivo. Nesta comunicação pretendemos dar conta da organização das sessĂ”es, dos critĂ©rios subjacentes Ă  escolha das estratĂ©gias e dos materiais utilizados, mas tambĂ©m Ă  selecção dos livros que fomos explorando ao longo deste projecto. Os registos efectuados, bem como a sua posterior anĂĄlise, permitiram aferir as aprendizagens e as dificuldades de cada criança envolvida. A riqueza das interacçÔes construĂ­das no decurso dos trĂȘs anos permitiu operacionalizar o carĂĄcter interdisciplinar do projecto, experimentar e ampliar metodologias de trabalho e conceber materiais adequados aos nossos objectivos

    Demographic Responses of Least Terns and Piping Plovers to the 2011 Missouri River Flood—A Large-Scale Case Study

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    2011 led to substantial changes in abundance and distribution of unvegetated sand habitat. This river system is a major component of the breeding range for interior Least terns (Sternula antillarum; “terns”) and piping plovers (Charadrius melodus; “plovers”), both of which are Federally listed ground-nesting birds that prefer open, unvegetated sand and gravel nesting substrates on sandbars and shorelines. The 2011 flood inundated essentially all tern and plover nesting habitat during 2011, but it had potential to generate post-flood habitat conditions that favored use by terns and plovers in subsequent years. We compared several tern and plover demographic parameters during the pre-flood and post-flood periods on the Garrison Reach and Lake Sakakawea, North Dakota, to determine how this event influenced these species (both species on the Garrison Reach, and plovers only on Lake Sakakawea). The principal parameters we measured (nest survival, chick survival, and breeding population) showed spatial and temporal variation typical of opportunistic species occupying highly variable habitats. There was little evidence that nest survival of least terns differed between pre- and post-flood. During 2012 when habitat was most abundant on the Garrison Reach and Lake Sakakawea, piping plover nest survival was higher than in any other year in the study, but returned to rates comparable to pre-flood years in 2013. Chick survival for terns on the Garrison Reach and plovers on Lake Sakakawea showed a similar pattern to plover nest survival, with the 2012 rate exceeding all other years of the study, and the remaining pre-flood and post-flood years being generally similar but slightly higher in post-flood years. However, plover chick survival on the Garrison Reach in 2012 was similar to pre-flood years, and increased annually thereafter to its highest rate in 2014. Although wide confidence intervals precluded firm conclusions about flood effects on breeding populations, the general pattern suggested lower populations of plovers but higher populations of least terns immediately after the flood. Despite near total absence of breeding habitat on either study area during the flood of 2011, populations of both species persisted after the flood due to their propensity to disperse and/or forgo breeding for at least a year. Tern and plover populations have similarly persisted and recovered after the flood, but their mechanisms for persistence likely differ. Data on tern dispersal is generally lacking, but they are thought to show little fidelity to their natal grounds, have a propensity to disperse potentially long distances, and routinely forgo breeding until their second year, thus a lost opportunity to breed in a given area may be easily overcome. Plovers exhibit stronger demographic ties to the general area in which they previously nested, yet they occupy much broader nesting habitat features than terns and exploit three major landforms in the Dakotas (free-flowing rivers, reservoir shorelines, and wetland shorelines). Consequently, dispersal to and from non-Missouri River habitats and potential to exploit non-traditional habitats likely sustained the Northern Great Plains population through the flood event. Terns and plovers normally occupy similar habitats on the Missouri River and both species experienced similar loss of a breeding season due to the flood. Persistence of these populations after the flood underscores the importance of understanding their unique demographic characteristics and the context within which the Missouri River operates

    First direct observation of Dirac fermions in graphite

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    Originating from relativistic quantum field theory, Dirac fermions have been recently applied to study various peculiar phenomena in condensed matter physics, including the novel quantum Hall effect in graphene, magnetic field driven metal-insulator-like transition in graphite, superfluid in 3He, and the exotic pseudogap phase of high temperature superconductors. Although Dirac fermions are proposed to play a key role in these systems, so far direct experimental evidence of Dirac fermions has been limited. Here we report the first direct observation of massless Dirac fermions with linear dispersion near the Brillouin zone (BZ) corner H in graphite, coexisting with quasiparticles with parabolic dispersion near another BZ corner K. In addition, we report a large electron pocket which we attribute to defect-induced localized states. Thus, graphite presents a novel system where massless Dirac fermions, quasiparticles with finite effective mass, and defect states all contribute to the low energy electronic dynamics.Comment: Nature Physics, in pres

    Scrutinising the appeal of volunteer Community Speedwatch to policing leaders in England and Wales: Resources, Responsivity and Responsibilisation

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    This article focuses on ‘Community Speedwatch’ (CSW) - a particular volunteering approach that has apparently attracted the attention of senior police decision-makers in England and Wales over recent years. It considers the significance of decisions by many Police and Crime Commissioners (PCCs) and Chief Constables to embrace CSW as a response to calls from the public for action against speeding motorists. CSW is apparently an option that ticks many boxes in a new era characterised by the increasing democratic accountability of the police. Whilst frequently promoted using the popular language of ‘empowerment’, ‘localism’, ‘self-help’ or ‘ownership’, and seemingly well-suited to current trends towards the increasing responsibilisation of the public, CSW should not be looked at as a straightforward example of a concerned public gifting their time to a grateful police. Rather than consider the road safety merits of the scheme, this paper views CSW as something of a tool which PCCs and Chief Constables can use to negotiate the often conflicting demands placed upon them in straightened economic circumstances. The paper draws on 22 interviews conducted with PCCs (during their first tenure) and Chief Constables in England and Wales
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