Effect of network modifiers on spectroscopic properties of erbium-doped phosphate glasses

The integrated absorption cross section Sigma(abs), I peak emission cross section sigma(cmi), Judd-Ofeld intensity parameters Omega(iota) ( t = 2,4,6), and spontaneous emission probability A(R) of Er3+ ions were determined for Erbium doped alkali and alkaline earth phosphate glasses. It is found the compositional dependence of sigma(emi) 5 almost similar to that of Sigma(abs), which is determined by the sum, of Omega(1) (3 Omega(2) + 10 Omega(4) + 21 Omega(6)). In addition, the compositional dependence of Omega(1) was studied in these glass systems. As a result, compared with. Omega(4) and Omega(6) the Omega(2) has a stronger compositional dependence on the ionic radius and content of modifers. The covalency of Er-O bonds in phosphate glass is weaker than that in silicate glass, germanate glass, aluminate glass, and tellurate glass, since Omega(6) of phosphate glass is relatively large. A(R) is affected by the covalency of the Er3+ ion sites and corresponds to the Omega(6) value.

Structural Integration of Tellurium Oxide into Mixed-Network-Former Glasses: Connectivity Distribution in the System NaPO3–TeO2

FSodium phosphate tellurite glasses in the system (NaPO3)(x)(TeO2)(1-x) were prepared and structurally characterized by thermal analysis, vibrational spectroscopy, X-ray photoelectron spectroscopy (XPS) and a variety of complementary solid-state nuclear magnetic resonance (NMR) techniques. Unlike the situation in other mixed-network-former glasses, the interaction between the two network formers tellurium oxide and phosphorus oxide produces no new structural units, and no sharing of the network modifier Na2O takes place. The glass structure can be regarded as a network of interlinked metaphosphate-type P(2) tetrahedral and TeO4/2 antiprismotic units. The combined interpretation of the O 1s XPS data and the P-31 solid-state NMR spectra presents clear quantitative evidence for a nonstatistical connectivity distribution. Rather the formation of homootomic P-O-P and Te-O-Te linkages is favored over mixed P-O-Te connectivities. As a consequence of this chemical segregation effect, the spatial sodium distribution is not random, as also indicated by a detailed analysis of P-31/No-23 rotational echo double-resonance (REDOR) experiments. ACHTUNGTRENUNG(TeO2)1 x were prepared and structurally characterized by thermal analysis,vibrat ional spectroscopy,X-ray photoelectron spectroscopy (XPS) and a variety of complementary solid-state nuclear magnetic resonance (NMR) techniques. Unlike the situation in other mixed-network-former glasses,the interaction between the two network formers tellurium oxide and phosphorus oxide produces no new structural units,and no sharing of the network modifier Na2O takes place. The glass structure can be regarded as a network of interlinked metaphosphate-type P(2) tetrahedral and TeO4/2 antiprismatic units. The combined interpretation of the O 1s XPS data and the 31P solid-state NMR spectra presents clear quantitative evidence for a nonstatistical connectivity distribution. Rather,the formation of homoatomic P O P and Te O Te linkages is favored over mixed P O Te connectivities. As a consequence of this chemical segregation effect,the spatial sodium distribution is not random,as also indicated by a detailed analysis of 31P/23Na rotational echo double-resonance (REDOR) experiments.

Medidas socioeducativas em meio aberto: reflexões acerca do processo de municipalização

A presente dissertação, apresentada ao Programa de Pós-Graduação em Psicologia Social da Universidade do Estado do Rio de Janeiro, teve como proposta pesquisar a municipalização das medidas socioeducativas em meio aberto. O objetivo da pesquisa foi o de retratar como esse processo estrutura-se no estado do Rio de Janeiro, especificamente no município de Niterói. A fim de compreender a dimensão estrutural da municipalização, foi realizada pesquisa de campo junto ao Departamento Geral de Ações Socioeducativas (DEGASE), órgão de referência estadual, e junto ao Centro de Referência Especializado de Assistência Social (CREAS) do município de Niterói. Os dados foram coletados por meio de entrevistas semiestruturadas, realizadas com representante da Assessoria às Medidas Socioeducativas e ao Egresso, vinculada ao DEGASE, e com o coordenador e os profissionais da equipe de referência socioeducativa do CREAS/Niterói. A categorização e análise dos dados foram empreendidas por meio da Análise de Conteúdo das entrevistas e das anotações feitas em diário de campo. Os resultados da pesquisa forneceram subsídios para uma reflexão acerca da execução das medidas socioeducativas de Liberdade Assistida e de Prestação de Serviço à Comunidade no processo de municipalização, além de um panorama a respeito da assessoria prestada aos municípios. Constatou-se, no estudo, a fragilidade do processo de municipalização, em especial pela precarização das condições de trabalho neste campo. Ao mesmo tempo, foi evidenciado que a escassez de um trabalho em rede com as instituições municipais e com o Sistema de Garantia de Direitos da criança e do adolescente dificulta que se siga o que dispõem o Estatuto da Criança e do Adolescente, o Sistema Nacional de Atendimento Socioeducativo e a Tipificação Nacional de Serviços Socioassistenciais no que diz respeito à execução das medidas em meio aberto. Os resultados da pesquisa indicam que o caráter social e educativo das medidas em meio aberto ainda está por ser assegurado aos adolescentes em cumprimento de medidas.

Strategies for Power Line Communications Smart Metering Network Deployment

Smart Grids are becoming a reality all over the world. Nowadays, the research efforts for the introduction and deployment of these grids are mainly focused on the development of the field of Smart Metering. This emerging application requires the use of technologies to access the significant number of points of supply (PoS) existing in the grid, covering the Low Voltage (LV) segment with the lowest possible costs. Power Line Communications (PLC) have been extensively used in electricity grids for a variety of purposes and, of late, have been the focus of renewed interest. PLC are really well suited for quick and inexpensive pervasive deployments. However, no LV grid is the same in any electricity company (utility), and the particularities of each grid evolution, architecture, circumstances and materials, makes it a challenge to deploy Smart Metering networks with PLC technologies, with the Smart Grid as an ultimate goal. This paper covers the evolution of Smart Metering networks, together with the evolution of PLC technologies until both worlds have converged to project PLC-enabled Smart Metering networks towards Smart Grid. This paper develops guidelines over a set of strategic aspects of PLC Smart Metering network deployment based on the knowledge gathered on real field; and introduces the future challenges of these networks in their evolution towards the Smart Grid.

Fe−TPP Coordination Network with Metalloporphyrinic Neutral Radicals and Face-to-Face and Edge-to-Face π−π Stacking

Artículo científico Inorg. Chem. 2013, 52, 8074−8081

Dehydration for a solid coordination network based on CuII-(py)2C(OH)2 trimers

Abstract de congreso: Póster presentado en 12th International Conference on Materials Chemistry (MC12), 20 - 23 July 2015, York, United Kingdom

Metalloporphyrin-based MOFs: First Cobalt Based TPPS-bipy Coordination Network

Poster presentado en el congreso: Third International Conference on Multifunctional, Hybrid and Nanomaterials (3-7 March 2013, Sorrento, Italy)