Structural properties of erbium-activated silica-titania glasses: modeling by molecular dynamics method

Here, we use molecular dynamics simulation to reconstruct a silica-titania glass with a Ti/Si atomic ratio of 8.5% activated by 0.7 at% of erbium. These quantities are chosen because they give both refractive index and optically ions concentration suitable for applications. We use a modified Born-Mayer-Huggins potential taking into account a three- body interaction. The distribution of TiO4 and SiO4 units as well as the bridging to non-bridging oxygen ratios are evaluated. The local environment of rare-earth ions is also analyzed. In particular, the clustering of erbium is discussed. From the simulated structure, the crystal-field strength is computed and discussed according to the Er3+ local environment. Finally, results are compared with information obtained by Raman and photoluminescence spectra

Métodos para determinar taninos em sorgo, avaliando-se o desempenho de aves e a digestibilidade in vitro da matéria seca.

Com o objetivo de comparar metodos para determinar a presenca de taninos em sorgo (Sorghum bicolor (L.) Moench), foi conduzido um experimento com aves e realizada a analise da digestibilidade "in vitro" da materia seca. Foram avaliados os metodos Azul da Prussia, Vanilina/HCI e Proantocianidina, e na preparacao das racoes, foram utilizados dez diferentes hibridos de sorgo e uma variedade de milho. A presenca de compostos fenolicos determinada pelo metodo Azul da Prussia apresentou maior correlacao com o ganho de peso das aves e a digestibilidade "in vitro" da materia seca

Tumor outgrowth in peripheral blood mononuclear cell-injected SCID mice is not associated with early Epstein–Barr virus reactivation

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Beam test results of the irradiated Silicon Drift Detector for ALICE

The Silicon Drift Detectors will equip two of the six cylindrical layers of high precision position sensitive detectors in the ITS of the ALICE experiment at LHC. In this paper we report the beam test results of a SDD irradiated with 1 GeV electrons. The aim of this test was to verify the radiation tolerance of the device under an electron fluence equivalent to twice particle fluence expected during 10 years of ALICE operation.Comment: 6 pages,6 figures, to appear in the proceedings of International Workshop In high Multiplicity Environments (TIME'05), 3-7 October 2005, Zurich,Switzerlan

Hostels : greenhouses or warehouses? : an ethnographic and theoretical study of the origins, development and purposes of approved premises

This thesis explores the development of hostels / approved premises and considers the existence of an 'unexplored' past that may help cast light on their current purposes. Drawing on historical and theoretical domains it constructs a hinterland from which to undertake critical exploration of their current practices and possible futures. A staged ethnographic study of two hostels is offered, with a four year gap in between to allow consideration as to whether hostels are changing and whether wider policy shifts impacting on probation more generally, can be seen to be shaping hostels' possible future(s). Observations, interviews, engagement in both formal and informal meetings with staff, residents and managers have been used to develop a view of hostels from the underside of practice. Critical theorising and exploration of hostels' past has been located against both the wider social and political shifts that may be seen to have impacted on the rehabilitative and re-integrative role of the hostel, and the emerging themes emanating from the ethnographic work. Key points of discussion include: an argument for a longer history of hostels than is currently suggested, an exploration of the relationship between hostels and the wider probation service and criminal justice system, the centrality of re-integration to rehabilitation and the impact of new punitiveness on hostels' changing role and function at the start of the 21st century. It is argued that a retreat from integration of offenders into society and a devaluing of their social agency and moral worth is now at risk of becoming accepted as part of hostels' 'new' public protection role. Consideration is given to how staff and residents may be experiencing the 'risk driven' changes that are taking place and what wider implications this works findings may have for policy, practice and rehabilitative theory. An alternative penology is offered that both takes account of hostels past and acknowledges their changed clientele.EThOS - Electronic Theses Online ServiceGBUnited Kingdo

Análise de qualidade de grãos de milho.

RESUMO - Foram utilizadas seis populações de milho (Zea mays L.), sendo duas de grãos do tipo dente opção (uma braquítica), duas de grãos do tipo duro de autofecundação e duas de grãos do tipo duro de meios irmãos. Foram realizadas análises de laboratório, de variância genética e de correlação fenotípica do peso de quinze grãos, percentagem de embrião, de óleo, de proteína e de triptofano. As populações de grãos dentados opacos foram superiores quanto aos conteúdos de óleo, triptofano e valor proteico, enquanto que aquelas com grãos duros de autofecundação mostraram maiores percentagens de proteína, ao passo que as de grãos duros de meios irmãos acusaram maiores possibilidades de incremento através do melhoramento genético, enquanto que a percentagem de proteína apresentou a menor viabilidade. Foram detectadas correlações positivas do conteúdo de óleo com tamanho de embrião e com percentagem de triptofano; e correlação negativa entre peso de grãos e percentagem de proteína. ABSTRACT - Six populations of com (Zea mays L.), including two of dent grain opaque-2 (one braquitic), two self-femtilized flint grain and two half-sib flint grain types were used. Laboratory analyses were made of genetic variance and phenotypic correlations of the weight of 15 grains, percentage of embryo, oil, protein and tryptophan. The opaque-2 dent grain populations were higher in oil content, tryptophan and protein value, and the self-fertilized flint grain populations were higher in protein percentage while the haif-sib flint grain populations showed higher grain weight values. Tryptophan content showed the greatest increase potential through genetic improvement while protein percentage showed the lowest. Positive phenotypic correlations of oil content with embryo sire and with tryptophan percentage were detected and negative correlation was found between grain weight and protein percentageTítulo em inglês: Analysis of grain quality in corn