Search

Ce3+‐activated silica nitride phosphors (lanthanum silicate‐nitride [LSN]) are promising thermostable conversion components for white‐light‐emitting diodes, screen technologies, and other optoelectronic applications. Cr3+‐activated TiO2, on the other hand, is a strongly absorbing material depending on its size and optical microenvironment. In this work, we gathered Cr3+‐doped TiO2 and La3Si6N11:Ce3+ in an optically transparent polymethylmethacrylate matrix. Photoluminescence of the binary blends of La3Si6N11:Ce3+/TiO2 and La3Si6N11:Ce3+/TiO2:Cr3+ has been investigated under two different excitation energies by steady‐state and lifetime‐based measurements, respectively. When the microscale La3Si6N11:Ce3+ phosphor and nanoscale TiO2:Cr3+ particles were gathered at a critical concentration, the resulting composite exhibited 3.14‐fold enhancement in the emission signal intensity with respect to the additive‐free phosphor. Upon excitation, the La3Si6N11:Ce3+–TiO2:Cr3+ blend exhibited different excited‐state lifetimes for the nano‐ and microsecond time‐scales compared to the LSN. The microsecond time‐scale measurements performed under 378 nm excitation supported the existence of a potential energy transfer from the TiO2:Cr3+ to the La3Si6N11:Ce3+. [ABSTRACT FROM AUTHOR]

Abstract Ce3+‐activated silica nitride phosphors (lanthanum silicate‐nitride [LSN]) are promising thermostable conversion components for white‐light‐emitting diodes, screen technologies, and other optoelectronic applications. Cr3+‐activated TiO2, on the other hand, is a strongly absorbing material depending on its size and optical microenvironment. In this work, we gathered Cr3+‐doped TiO2 and La3Si6N11:Ce3+ in an optically transparent polymethylmethacrylate matrix. Photoluminescence of the binary blends of La3Si6N11:Ce3+/TiO2 and La3Si6N11:Ce3+/TiO2:Cr3+ has been investigated under two different excitation energies by steady‐state and lifetime‐based measurements, respectively. When the microscale La3Si6N11:Ce3+ phosphor and nanoscale TiO2:Cr3+ particles were gathered at a critical concentration, the resulting composite exhibited 3.14‐fold enhancement in the emission signal intensity with respect to the additive‐free phosphor. Upon excitation, the La3Si6N11:Ce3+–TiO2:Cr3+ blend exhibited different excited‐state lifetimes for the nano‐ and microsecond time‐scales compared to the LSN. The microsecond time‐scale measurements performed under 378 nm excitation supported the existence of a potential energy transfer from the TiO2:Cr3+ to the La3Si6N11:Ce3+.

Distance Education is the natural evolution of a human-centered branch of education. Recently. the rapid development of social networks has decisively contributed to the configuration of a new environment in the field of distance education (Jones, 2020) which also has an impact on adult education. The research objective is the attitude of teachers towards the use of social networks in the context of their training. At the same time, the pedagogical utilization of Social Networking in the context of Teacher training was investigated. The Laboratory for Advanced Learning Technologies in Lifelong and Distance Learning [e-Learning Labl of the Department of Education of the University of Crete created a new social network which is called Learning Social Network (LSN). The sample of the research consisted of 45 trained teachers who participated in a distance learning program. Participants were asked to comment on their recent experience with LSN with respect to communication. collaboration, usability. interaction and learning. All the data are reliable as Cronbach's Alpha is 0.961. Findings indicate that that social networks can be used pedagogically in various levels: communication, collaboration. interaction. as well as participatory learning and LSN can give the ability to enables users to create a personalized teaching, learning and social networking environment. [ABSTRACT FROM AUTHOR]

O presente artigo tem o propósito de analisar documentos de natureza repressiva oriundos do Departamento de Ordem Política e Social do Estado de São Paulo, DEOPS, órgão policial pertencente ao DOPS, fundado em 1924 no Brasil para fins de controle e vigilância de atividades, movimentos e indivíduos considerados suspeitos pelo Estado. A partir do Golpe de 1964, o órgão expandiu o seu campo de ação e adquiriu o comando da repressão aos indivíduos considerados "perigosos" à Segurança Nacional, doutrina formulada e colocada em prática pelos cinco governos militares que institucionalizaram o arbítrio e o terror. Entre os perseguidos, destacamos a trajetória política do ex-guerrilheiro e historiador, Daniel Arão Reis Filho, principalmente pela importância para compreendermos a passagem de muitos jovens que migraram da militância estudantil para a militância armada. Em conjunto com os documentos do DEOPS, analisamos os Processos da Justiça Militar relativos ao historiador, arquivados pelo Projeto Brasil Nunca Mais, pois, oferecem informações preciosas sobre o modo como operou a suspeição e condenação de homens e mulheres que lutaram contra o regime. Trechos de entrevistas do historiador também serão referenciados para compor o rastro de quem viveu e viu por dentro o emprego da tortura, principal engrenagem dos interrogatórios.

O presente artigo tem o propósito de analisar documentos de natureza repressiva oriundos do Departamento de Ordem Política e Social do Estado de São Paulo, DEOPS, órgão policial pertencente ao DOPS, fundado em 1924 no Brasil para fins de controle e vigilância de atividades, movimentos e indivíduos considerados suspeitos pelo Estado. A partir do Golpe de 1964, o órgão expandiu o seu campo de ação e adquiriu o comando da repressão aos indivíduos considerados “perigosos” à Segurança Nacional, doutrina formulada e colocada em prática pelos cinco governos militares que institucionalizaram o arbítrio e o terror. Entre os perseguidos, destacamos a trajetória política do ex-guerrilheiro e historiador, Daniel Arão Reis Filho, principalmente pela importância para compreendermos a passagem de muitos jovens que migraram da militância estudantil para a militância armada. Em conjunto com os documentos do DEOPS, analisamos os Processos da Justiça Militar relativos ao historiador, arquivados pelo Projeto Brasil Nunca Mais, pois, oferecem informações preciosas sobre o modo como operou a suspeição e condenação de homens e mulheres que lutaram contra o regime. Trechos de entrevistas do historiador também serão referenciados para compor o rastro de quem viveu e viu por dentro o emprego da tortura, principal engrenagem dos interrogatórios.

Anterolateral system neurons relay pain, itch, and temperature information from the spinal cord to pain-related brain regions, but the differentiation of these neurons and their specific contribution to pain perception remain poorly defined. Here, we show that most mouse spinal neurons that embryonically express the autonomic-system-associated Paired-like homeobox 2A (Phox2a) transcription factor innervate nociceptive brain targets, including the parabrachial nucleus and the thalamus. We define the Phox2a anterolateral system neuron birth order, migration, and differentiation and uncover an essential role for Phox2a in the development of relay of nociceptive signals from the spinal cord to the brain. Finally, we also demonstrate that the molecular identity of Phox2a neurons is conserved in the human fetal spinal cord, arguing that the developmental expression of Phox2a is a prominent feature of anterolateral system neurons., Competing Interests: Declaration of Interests The authors declare no competing interests., (Copyright © 2020 The Authors. Published by Elsevier Inc. All rights reserved.)