Fano resonances in plasmonic core-shell particles and the Purcell effect

Despite a long history, light scattering by particles with size comparable with the light wavelength still unveils surprising optical phenomena, and many of them are related to the Fano effect. Originally described in the context of atomic physics, the Fano resonance in light scattering arises from the interference between a narrow subradiant mode and a spectrally broad radiation line. Here, we present an overview of Fano resonances in coated spherical scatterers within the framework of the Lorenz-Mie theory. We briefly introduce the concept of conventional and unconventional Fano resonances in light scattering. These resonances are associated with the interference between electromagnetic modes excited in the particle with different or the same multipole moment, respectively. In addition, we investigate the modification of the spontaneous-emission rate of an optical emitter at the presence of a plasmonic nanoshell. This modification of decay rate due to electromagnetic environment is referred to as the Purcell effect. We analytically show that the Purcell factor related to a dipole emitter oriented orthogonal or tangential to the spherical surface can exhibit Fano or Lorentzian line shapes in the near field, respectively.Comment: 28 pages, 10 figures; invited book chapter to appear in "Fano Resonances in Optics and Microwaves: Physics and Application", Springer Series in Optical Sciences (2018), edited by E. O. Kamenetskii, A. Sadreev, and A. Miroshnichenk

Los pliegues cutáneos como predictores del porcentaje graso en futbolistas profesionales

El objetivo del presente estudio fue determinar los pliegues cutáneos que mejor predicen el porcentaje de grasa de futbolistas profesionales Peruanos a partir de tres ecuaciones. Para lo cual, se estudiaron 136 futbolistas profesionales evaluándose el peso corporal (kg), la estatura (m) y los pliegues cutáneos (mm) tricipital, subescapular, suprailiaco, abdominal, muslo y pantorrilla. Los resultados fueron analizados a través de la estadística descriptiva de la media aritmética (X) y desviación estándar (DE) y la estadística inferencial de regresión múltiple StepWise (p<0,001). Los resultados señalan que el % de grasa corporal hallado por las tres ecuaciones sugieren que los pliegues cutáneos tricipital, subescapular, suprailiaco y abdominal, explican mejor el % de grasa en relación a los pliegues del muslo y la pantorrilla media.The aim of this study was to determine the best predictors skinfold fat percentage Peruvian professional footballers from three equations. To this end, we studied 136 professional football players evaluated body weight (kg), height (m) and skinfold (mm) triceps, subscapular, suprailiac, abdominal, thigh and calf. The results were analyzed through descriptive statistics of the arithmetic mean (X) and standard deviation (SD) and inferential statistics multiple stepwise regression (p <0.001). The results indicate that the% body fat found by the three equations suggest that the triceps skinfold, subscapular, suprailiac and abdominal best explain the% fat in relation to the folds of the thigh and calf average.Peer Reviewe

Vegetação e estimativa da quantidade de mangabeiras no assentamento São Sebastião, Pirambu, SE.

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Implantação de minibibliotecas escolares: uma iniciativa da Embrapa para agricultores familiares.

A velocidade com que a informação é gerada transforma rapidamente as sociedades. Aqueles que não tem acesso à informação são marginalizados do processo de desenvolvimento social, econômico e tecnológico. Essa distribuição injusta das oportunidades é o ponto de partida da nossa discussão. Nosso foco são as escolas públicas rurais enquanto espaços ?privilegiados? de promoção da inclusão social. O presente artigo apresentará uma análise da experiência de implantação de Minibibliotecas Escolares no Semi-Árido Brasileiro, atualmente com 440 escolas participantes. Disponibiliza também os resultados de uma pesquisa de avaliação realizada entre novembro de 2006 e fevereiro de 2007, com as escolas participantes do projeto. Esses procedimentos fazem parte das ações da Embrapa no Programa Fome Zero desenvolvidas desde 2004, com o intuito de propiciar o repasse de informações e a gestão tecnológica através das escolas da área rural

Information communication between the library and the extension in the Brazilian Agricultural Research Corporation (Embrapa).

The exponential increase of information available and the potential mechanisms for storage and recovery made clear the need to extend the traditional concept of reference services/ mediation of information from libraries. The offer of information is located at the intersection of two fields of information science: the study of demands for profiles, and the organization, processing and availability of information for effective use. This work aims to present the experience related to the development of a project Embrapa Library System (SEB), whose main objective was to build interactive strategies of dissemination of knowledge generated by the Brazilian Agricultural Research Corporation (Embrapa). This project first resulted in a diagnosis of the extension in the state of Rondônia, which supported the creation of online and offline customer service in libraries, creating an information channel with news about the world of scientific and technological information and training for extension in the use of database and digital repositories of Embrapa