23,924 research outputs found
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
- …