Inovação colaborativa e repositórios de dados científicos: proposta de ambiência para promoção de tecnologias para a agricultura familiar.

A construção compartilhada, pensada para o processo de inovação tecnológica na agricultura, deve ser vista como um modelo capaz de romper as fronteiras organizacionais, criando conexões entre todos os atores envolvidos no processo: consumidores, parceiros, fornecedores e demais agentes, para agregar valor ao produto final. Um projeto da Embrapa tem como objetivo estruturar uma ambiência, que propõe a produção coletiva do conhecimento (crowdsourcing) a partir de serviços de informação tecnológica, tais como repositórios de dados científicos de acesso aberto, como um processo alternativo e auxiliar de geração de novas tecnologias para a agricultura familiar. Para subsidiar o projeto, realizou-se um levantamento na base de dados ?Agricola?, sobre o tema da colaboratividade e inovação e discutiu-se dois trabalhos, sobre estruturas de Serviços de Informação Tecnológica, onde ocorre a coleta e registro de informações oriundas dos consumidores e usuários, em que a colaboratividade tem sido vista de maneira estratégica para a resolução de questões comuns, bem como proposições de novas abordagens para a P&D.Disponível em: . Acesso em: 22 dez. 2014

The impact of the air-fluorescence yield on the reconstructed shower parameters of ultra-high energy cosmic rays

An accurate knowledge of the fluorescence yield and its dependence on atmospheric properties such as pressure, temperature or humidity is essential to obtain a reliable measurement of the primary energy of cosmic rays in experiments using the fluorescence technique. In this work, several sets of fluorescence yield data (i.e. absolute value and quenching parameters) are described and compared. A simple procedure to study the effect of the assumed fluorescence yield on the reconstructed shower parameters (energy and shower maximum depth) as a function of the primary features has been developed. As an application, the effect of water vapor and temperature dependence of the collisional cross section on the fluorescence yield and its impact on the reconstruction of primary energy and shower maximum depth has been studied.Comment: Accepted in Astroparticle Physic

Global extraction of the parton-to-pion fragmentation functions at NLO accuracy in QCD

In this review, we discuss the results on the parton-to-pion fragmentation functions obtained in a combined NLO fit to data of single-inclusive hadron production in electron-positron annihilation, proton-proton collisions, and lepton-nucleon deep-inelastic scattering. A more complete discussion can be found in Ref. [1].Comment: 6 pages, 1 figure. To be published in Journal of Physics Conference Series (IOP). Joint Proceedings of the XV Mexican Workshop on Particles and Fields & the XXX Annual Meeting of the Division of Particles and Fields of the Mexican Physical Societ

Hinting at primary composition using asymmetries in time distributions

Evidence of azimuthal asymmetries in the time structure and signal size have been found in non-vertical showers at the Pierre Auger Observatory. It has been previously shown that the asymmetry in time distributions offers a new possibility for the determination of the mass composition. New studies have demonstrated that the dependence of the asymmetry parameter in the rise-time and fall-time distributions with sec(theta) shows a clear peak. Both, the position of the peak, X_asymax, and the size of the asymmetry at X_asymax are sensitive to primary mass composition and have a small dependence on energy. In this paper a study of the discriminating power of the new observables to separate primary species is presented.Comment: To be published in the Proceedings of 29th International Cosmic Ray Conference (ICRC 2005), Pune, India, August 3-10, 200