Controle do míldio da videira com diferentes volumes de aplicação e degradação de fungicida em cultivo protegido por cobertura plástica.

Os objetivos deste trabalho foram, então, os de: a) avaliar o depósito de pulverização com diferentes volumes de aplicação e sua eficiência no controle do míldio da videira; b) comparar a degradação ou a permanência do fungicida tebuconazol em videiras cultivadas sob cobertura plástica e em videiras cultivadas sob tela.bitstream/item/81904/1/cot135.pd

Exploring the spectroscopic diversity of type Ia supernovae with DRACULA: a machine learning approach

The existence of multiple subclasses of type Ia supernovae (SNeIa) has been the subject of great debate in the last decade. One major challenge inevitably met when trying to infer the existence of one or more subclasses is the time consuming, and subjective, process of subclass definition. In this work, we show how machine learning tools facilitate identification of subtypes of SNeIa through the establishment of a hierarchical group structure in the continuous space of spectral diversity formed by these objects. Using Deep Learning, we were capable of performing such identification in a 4 dimensional feature space (+1 for time evolution), while the standard Principal Component Analysis barely achieves similar results using 15 principal components. This is evidence that the progenitor system and the explosion mechanism can be described by a small number of initial physical parameters. As a proof of concept, we show that our results are in close agreement with a previously suggested classification scheme and that our proposed method can grasp the main spectral features behind the definition of such subtypes. This allows the confirmation of the velocity of lines as a first order effect in the determination of SNIa subtypes, followed by 91bg-like events. Given the expected data deluge in the forthcoming years, our proposed approach is essential to allow a quick and statistically coherent identification of SNeIa subtypes (and outliers). All tools used in this work were made publicly available in the Python package Dimensionality Reduction And Clustering for Unsupervised Learning in Astronomy (DRACULA) and can be found within COINtoolbox (https://github.com/COINtoolbox/DRACULA).Comment: 16 pages, 12 figures, accepted for publication in MNRA

Efeito de inoculantes micorrízicos na produção de mudas de banana.

A inoculação de plantas com fungos micorrízicos arbusculares vem sendo adotada como alternativa à dependência de fertilizantes fosfatados durante a fase de crescimento de mudas. Além disso, inoculantes micorrizados também tem sido associados a uma melhor condição de crescimento de explantes micropropagados durante a fase de aclimatação. O desafio é a natureza biotrófica obrigatória dos fungos micorrízicos arbusculares, os quais completam seu ciclo apenas em raízes de culturas vivas

Synthesis of CdS and CdSe nanocrystallites using a novel single-molecule precursors approach

The synthesis of CdS and CdSe nanocrystallites using the thermolysis of several dithioor diselenocarbamato complexes of cadmium in trioctylphosphine oxide (TOPO) is reported. The nanodispersed materials obtained show quantum size effects in their optical spectra and exhibit near band-edge luminescence. The influence of experimental parameters on the properties of the nanocrystallites is discussed. HRTEM images of these materials show well-defined, crystalline nanosized particles. Standard size fractionation procedures can be performed in order to narrow the size dispersion of the samples. The TOPO-capped CdS and CdSe nanocrystallites and simple organic bridging ligands, such as 2,2¢-bipyrimidine, are used as the starting materials for the preparation of novel nanocomposites. The optical properties shown by these new nanocomposites are compared with those of the starting nanodispersed materials

Diagnóstico da citricultura na microrregião do Guamá, PA.

bitstream/item/61865/1/Oriental-Doc24.pd

Recursos forrageiros regionais conservados como feno para a alimentação de bovinos na região de Corumbá, MS.

A produção de feno para fornecimento ao gado durante a estação seca, com o uso de espécies forrageiras regionais com ampla distribuição nos assentamentos rurais da região de Corumbá/MS, representa uma alternativa simples e economicamente viável para aumentar à produtividade dos rebanhos leiteiros, além de se configurar em uma etapa da transição agroecológica, ou seja, a substituição de insumos externos por alternativas disponíveis localmente.bitstream/CPAP-2010/57325/1/CT87.pd