245 research outputs found
Avaliação do efeito de veranico na produção de matéria seca de milho e sorgo.
O presente trabalho teve como principal objetivo a influencia de veranicos nas fases inicial e reprodutiva na producao de materia seca de milho e sorgo. O ensaio foi instalado em um latossolo Vermelho-Escuro,distrofico, fase cerrado, durante os anos agricolas de 1982 a 1985. No primeiro ano aplicou-se 3,7 toneladas de calcario dolomitico e fez-se uma adubacao de correcao baseada em analises do solo. As cultivares de milho utilizadas foram BR 126 e CMSXS 201 Xe, as de sorgo, BR 505 e BR 601. Em cada ano agricola estes hibridos foram plantados em 4 diferentes epocas (8, 15 e 25 de outubro e 5 de novembro), com e sem irrigacao suplementar. O delineamento experimental utilizado foi blocos casualizados com 5 repeticoes. Quantificou-se a materia seca correspondente a parte aerea das plantas colhidas quando os graos encontravam-se na fase de grao macio. Embora os resultados tenham mostrado tanto para o milho como para o sorgo, que as producoes entre anos, nao diferiram significativamente, houve um aumento medio da producao das culturas irrigadas sobre as nao irrigadas de 12 a 27% para o milho e cerca de 36% para o sorgo. Estas diferencas podem ser atribuidas a ocorrencia de veranico durante o ciclo das culturas. A producao de milho foi superior a do sorgo, principalmente quando foi utilizada irrigacao suplementar Embora a ocorrencia de veranico na fase inicial de crescimento tenha influenciado na producao de ambas as culturas, o sorgo demonstrou-se mais sensivel ao deficit de agua ate 20 a 25 dias
Cerebral vasomotor reactivity assessment using transcranial doppler and MRI with apnea test
CNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULODifferently from previous studies that used Transcranial Doppler (TCD) and functional MRI (fMRI) for cerebral vasomotor reactivity (CVR) assessment in patients with carotid stenosis (CS), we assessed CVR using an identical stimulus, the Breath-Holding Test (BHT). We included 15 patients with CS and 7 age-matched controls to verify whether fMRI responded differently to BHT between groups and to calculate the agreement rate between tests. For TCD, impaired CVR was defined when the mean percentage increase on middle cerebral artery velocities was p31% on 3 consecutive 30-s apnea intercalated by 4-min normal breathing intervals. For fMRI, the percent variation on blood oxygen level-dependent (BOLD) signal intensity in the lentiform nucleus (LN) ipsilateral to the CS (or both LNs for controls) from baseline breathing to apnea was measured. The Euclidian differences between the series of each subject and the series of controls and patients classified it into normal or impaired CVR. We found different percent variations on BOLD-signal intensities between groups (P=0.032). The agreement was good in Controls (85.7%; kappa=0.69) and overall (77.3%; kappa=0.54). We conclude that BHT was feasible for CVR assessment on fMRI and elicited different BOLD responses in patients and controls, with a good overall agreement between the tests.Differently from previous studies that used Transcranial Doppler (TCD) and functional MRI (fMRI) for cerebral vasomotor reactivity (CVR) assessment in patients with carotid stenosis (CS), we assessed CVR using an identical stimulus, the Breath-Holding Test (BHT). We included 15 patients with CS and 7 age-matched controls to verify whether fMRI responded differently to BHT between groups and to calculate the agreement rate between tests. For TCD, impaired CVR was defined when the mean percentage increase on middle cerebral artery velocities was p31% on 3 consecutive 30-s apnea intercalated by 4-min normal breathing intervals. For fMRI, the percent variation on blood oxygen level-dependent (BOLD) signal intensity in the lentiform nucleus (LN) ipsilateral to the CS (or both LNs for controls) from baseline breathing to apnea was measured. The Euclidian differences between the series of each subject and the series of controls and patients classified it into normal or impaired CVR. We found different percent variations on BOLD-signal intensities between groups (P=0.032). The agreement was good in Controls (85.7%, kappa=0.69) and overall (77.3%, kappa=0.54). We conclude that BHT was feasible for CVR assessment on fMRI and elicited different BOLD responses in patients and controls, with a good overall agreement between the tests.491118CNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO2010/52027-1, 2013/07559-3480976/2010-4The institutional support of Prof. Fernando Cendes and the Neurovascular Study Group, as well as the kind assistance of Ms. Isilda Assumpcao (RN) and team, are gratefully acknowledged. This research was supported by FAPESP (Process 2010/52027-1 and 2013/07559-3) and CNPq (Process 480976/2010-4)
Physico-chemical and biochemical parameters to highlight quality changes of 'rocha' pear during ca storage
Controlling Excitations Inversion of a Cooper Pair Box Interacting with a Nanomechanical Resonator
We investigate the action of time dependent detunings upon the excitation
inversion of a Cooper pair box interacting with a nanomechanical resonator. The
method employs the Jaynes-Cummings model with damping, assuming different decay
rates of the Cooper pair box and various fixed and t-dependent detunings. It is
shown that while the presence of damping plus constant detunings destroy the
collapse/revival effects, convenient choices of time dependent detunings allow
one to reconstruct such events in a perfect way. It is also shown that the mean
excitation of the nanomechanical resonator is more robust against damping of
the Cooper pair box for convenient values of t-dependent detunings.Comment: 11 pages, 5 figure
Spatial variability of soil fertility attributes and productivity in a coffee crop farm
ArticleCoffee cultivation is of great importance to Brazilian agribusiness, as coffee occupies
extensive production areas and is one of the most exported Brazilian products. To maintain coffee
production numbers, productive techniques must be adopted that optimize productive system use.
The objective of this work was to apply geostatistical techniques in the evaluation of soil fertility
attributes to construct maps of variability in soil fertility parameters and the productivity of a
coffee crop in the municipality of Monte Carmelo, Minas Gerais (MG), Brazil. The work was
developed with coffee of the cultivar Mundo Novo 379/19, and 19 sample points were
georeferenced in Universal Transverse Mercator coordinates. Spatial dependence of the fertility
and productivity parameters was analysed via classic semivariogram fitting and interpolation by
ordinary kriging using the statistical computer system, R. All parameters evaluated showed high
degrees of spatial dependence. The attribute values varied along the sampling points, except for
the sodium (Na) contents, which had similar values in all samplings. The studied parameters
ranged from 80 to 200 metres. It is conclusion, the use of productivity maps linked to soil
chemical attributes can be useful for determining the occurrence of variable productivity rates
throughout the area, allowing the adoption of corrective practices for subsequent crops and thus
making the maps very useful tools for producers
Implantação da gestão ambiental na Embrapa Milho e Sorgo: melhoria do processo de gerenciamento de resíduos de laboratórios e de campos experimentais.
Generation of two-photon EPR and Wstates
In this paper we present a scheme for generation of two-photon EPR and W
states in the cavity QED context. The scheme requires only one three-level
Rydberg atom and two or three cavities. The atom is sent to interact with
cavities previously prepared in vacuum states, via two-photon process. An
appropriate choice of the interaction times one obtains the mentioned state
with maximized fidelities. These specific times and the values of success
probability and fidelity are discussed.Comment: 4 pages, 5 figure
Laboratório móvel para monitoramento, avaliação e gerência de atributos de sistemas de produção agrícola.
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