Edge-defined, film-fed growth (EFG) technique for the preparation of alpha-Al2O3 : C crystal with highly sensitive thermoluminescence response

In this work, alpha-Al2O3:C, a highly sensitive thermoluminescence dosimetry crystal, was grown by the EFG method in which a graphite heating unit and shield acted as the carbon source during the growth process. The optical, luminescent properties and dosimetric characteristics of the crystal were investigated. The as-grown crystal shows a single glow peak at 536 K, which is associated with Cr3+ ions. After annealing in H-2 at 1673 K for 80 h, the crystal shows a single glow peak at 460 K and a blue emission band at 415 nm. The thermoluminescent response of the annealed crystal shows linear-sublinear-saturation characteristics in the dose range from 5 x 10(-6) to 100 Gy.

Enhancement of near-band edge photoluminescence of ZnO thin films by employing MgF2 buffer layer

ZnO/MgF2/ZnO sandwich structure films were fabricated. The effects of a buffer layer on structure and optical properties of ZnO films were investigated by X-ray diffraction, photoluminescence, optical transmittance and absorption measurements. Measurement results showed that the buffer layer had the effects of improving the quality of ZnO films and releasing the residual stresses in the films. The near-band edge emissions of ZnO films deposited on the MgF2 buffer layer were significantly enhanced compared with those deposited on bare substrate due to the smaller lattice mismatch between MgF2 and ZnO than that between fused silica and ZnO. (c) 2006 Elsevier B.V. All rights reserved.

Enhancement of near-band-edge photoluminescence of ZnO thin films in sandwich configuration at room temperature

ZnO/ITO/ZnO sandwich structure films were fabricated. The effects of buffer layer on the structure and optical properties of ZnO films were investigated by x-ray diffraction (XRD), photoluminescence, optical transmittance, and absorption measurements. XRD spectra indicate that a buffer layer has the effects of lowering the grain orientation of ZnO films and increasing the residual stresses in the films. The near-band-edge emissions of ZnO films deposited on both single indium tin oxide (ITO) buffer and ITO/ZnO double buffers are significantly enhanced compared with that deposited on a bare substrate due to the quantum confinement effect. (C) 2006 American Institute of Physics.

The effects of oxygen partial pressure on the optical absorption edge and the UV emission energy of ZnO films

The optical absorption edge and ultraviolet (UV) emission energy of ZnO films deposited by direct current (DC) reactive magnetron sputtering at room temperature have been investigated. With the oxygen ratio increasing, the structure of films changes from zinc and zinc oxide coexisting phase to single-phase ZnO and finally to the highly (002) orientation. Both the grain size and the stress of ZnO film vary with the oxygen partial pressure. Upon increasing the oxygen partial pressure in the growing ambient, the visible emission in the room-temperature photoluminescence spectra was suppressed without sacrificing the band-edge emission intensity in the ultraviolet region. The peaks of photoluminescence spectra were located at 3.06---3.15 eV. From optical transmittance spectra of ZnO films, the optical band gap edge was observed to shift towards shorter wavelength with the increase of oxygen partial pressure.

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

Individuação e inocência: composições com Simondon e Whitehead

A filosofia viveu um tempo de luminosidade crua em que havia contentamento (pelo menos entre os filósofos dignos de serem estudados) com a postulação das condições de possibilidade que cabiam no horizonte que essa luz podia, então, iluminar. Tudo que escapasse desse horizonte era obscuridade, irracionalidade, mera especulação e, pior de todas as ofensas: metafísica. Mas, alguma filosofia do séc. XX encontrou uma outra distribuição de luminosidade que permitiu um pensamento em claro-escuro, em tonalidades nuançadas em que a nitidez absoluta dos contornos se viu fluidificar, em que as figuras puras e sólidas se mostraram como híbridas, nebulosas derramadas, em que os objetos entraram na história e os homens se misturaram com a natureza, em que os movimentos do mundo e as imagens na consciência saíram da dualidade das qualidades primárias e secundárias e se aventuraram em novas perspectivas (aventuras que ainda atravessam desde a fenomenologia até o cinema). É neste cenário de novas distribuições que reaparece a questão da individuação apontando para uma outra concepção do indivíduo, não mais substancial e suporte de qualidades, não mais ancorado nos pares matéria e forma, atual e potencial. Tais pares se revelam insuficientes por não darem conta das impurezas que vêm à tona e das surpreendentes possibilidades inventadas (simbioses, alianças, infecções) e não somente atualizadas a partir de um potencial (filiação, reprodução). Nesse novo modo de compor, o atributo não mais se remete a um predicado qualidade, mas ao acontecimento, não mais às possibilidades latentes, mas à potência a ser inventada nas composições, nas relações constituintes dos diferentes modos de existência. Simondon foi o primeiro filósofo a levar em conta, de modo específico, o indivíduo se inventando em composição, daí ter renovado a questão da individuação e transformado o estatuto da relação. O ser é relação, tal é, com Simondon, a proposição que passa a figurar no centro do pensamento da individuação. Mas se, por um lado, havia essa promoção da relação, por outro lado, parecia não haver a liberação dos modos que, enfim, remetiam a uma natureza dos possíveis. Mesmo não funcionando como princípio, essa natureza parecia capturar os modos num potencial, de tal maneira que um novo humanismo, tão sufocante quanto qualquer outro, acompanhava toda a produção de Simondon. Não à toa, sua narrativa dos diferentes modos se fecha no encontro de uma unidade capaz de suportar o multirealismo dos híbridos que surgiam por toda parte. As metas, os sentidos do devir que povoam a obra de Simondon não seriam os ecos de uma velha moral da pureza, da luminosidade branca?Para escapar desse rebatimento da aventura dos modos em tipos privilegiados de relação que levavam a restaurar a unidade perdida, era preciso se lançar na inocência do processo das inumeráveis atividades de um tecido sem base, jogo de linhas impuras em cruzamentos inventados a cada momento. Nesse sentido: era o pensamento especulativo, expresso em sua própria escrita em zig-zag, de Whitehead já um antídoto aos possíveis rebatimentos da nova filosofia da individuação num mundo por demais reconhecido? É esse o espírito da composição nesse trabalho: a individuação simondoneana com a insistência em se entregar à aventura inocente dos processos se fazendo que se encontra em Whitehead (e nos muitos aliados que foram convocados para que outras músicas se façam ouvir).

System architecture and deployment scenarios for SESAME: Small cEllS coordinAtion for Multi-tenancy and Edge services

The surge of the Internet traffic with exabytes of data flowing over operators mobile networks has created the need to rethink the paradigms behind the design of the mobile network architecture. The inadequacy of the 4G UMTS Long term Evolution (LTE) and even of its advanced version LTE-A is evident, considering that the traffic will be extremely heterogeneous in the near future and ranging from 4K resolution TV to machine-type communications. To keep up with these changes, academia, industries and EU institutions have now engaged in the quest for new 5G technology. In this paper we present the innovative system design, concepts and visions developed by the 5G PPP H2020 project SESAME (Small cEllS coordinAtion for Multi-tenancy and Edge services). The innovation of SESAME is manifold: i) combine the key 5G small cells with cloud technology, ii) promote and develop the concept of Small Cellsas- a-Service (SCaaS), iii) bring computing and storage power at the mobile network edge through the development of nonx86 ARM technology enabled micro-servers, and iv) address a large number of scenarios and use cases applying mobile edge computing. Topics:

Transforming aquatic agricultural systems towards gender equality: a five country review

Aquatic agricultural systems (AAS) are systems in which the annual production dynamics of freshwater and/or coastal ecosystems contribute significantly to total household income. Improving the livelihood security and wellbeing of the estimated 250 million poor people dependent on AAS in Bangladesh, Cambodia, the Philippines, the Solomon Islands and Zambia is the goal of the Worldfish Center-led Consortium Research Program (CRP), “Harnessing the development potential of aquatic agricultural systems for development.” One component expected to contribute to sustainably achieving this goal is enhancing the gender and wider social equity of the social, economic and political systems within which the AAS function. The CRP’s focus on social equity, and particularly gender equity, responds to the limited progress to date in enhancing the inclusiveness of development outcomes through interventions that offer improved availability of resources and technologies without addressing the wider social constraints that marginalized populations face in making use of them. The CRP aims to both offer improved availability and address the wider social constraints in order to determine whether a multi-level approach that engages with individuals, households and communities, as well as the wider social, economic and political contexts in which they function, is more successful in extending development’s benefits to women and other excluded groups. Designing the research in development initiatives to test this hypothesis requires a solid understanding of each CRP country’s social, cultural and economic contexts and of the variations across them. This paper provides an initial input into developing this knowledge, based on a review of literature on agriculture, aquaculture and gender relations within the five focal countries. Before delving into the findings of the literature review, the paper first justifies the expectation that successfully achieving lasting wellbeing improvements for poor women and men dependent on AAS rests in part on advances in gender equity, and in light of this justification, presents the AAS CRP’s conceptual framew