Neutron Probe
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Verification of Response of Neutron Monitor for In-Flight Neutron Dosimetry
ABSTRACT: In this work, we present the results of verification of special neutron monitoring equipment for use in aircrew dosimetry inside aircraft. The equipment was precalibrated with conventional neutron sources in a National Standard Laboratory of the Institute for Radioprotection and Dosimetry (IRD, Brazil) and verified in a Cosmic Energy Reference Fiel
J. Aerosp. Technol. Manag.. Publicado em: 2013-09
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2. Evapotranspiração do feijoeiro irrigado em plantio direto sobre diferentes palhadas de culturas de cobertura.
O objetivo deste trabalho foi determinar o efeito das palhadas de diferentes culturas de cobertura na evapotranspiração do feijoeiro irrigado cultivar Pérola. O experimento foi conduzido por dois anos, 2002/2003 e 2003/2004, na Embrapa Arroz e Feijão, em Santo Antônio de Goiás, GO, em Latossolo Vermelho distrófico, em delineamento de blocos ao acaso,
Pesquisa Agropecuária Brasileira. Publicado em: 2011
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3. Osmotic stress on concentrated colloidal suspensions: a path towards equilibrium?
We discuss in this study the advantages and limitations of the osmotic stress method that enables to set the osmotic pressure to a given system. By investigating aqueous suspension of monodisperse silica nanoparticles of radius 78 at an ionic strength of 10-2 mol/L, we show that the method is very accurate to probe the phase behavior of colloidal suspensions
Brazilian Journal of Physics. Publicado em: 2009-04
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4. Variabilidade espacial de propriedades físicas e químicas de um neossolo flúvico cultivado com cenoura irrigada com água moderamente salina
An experiment has been performed aiming to evaluate the spatial-time variation patterns of soil humidity in an irrigated area in Pesqueira PE. The experiment has been carried out in an irrigated plot with carrot, with duration of 96 days. Two irrigated sectors (1 and 2) with 900 m2 each (30 m x 30 m) have been monitored in the experiment, using microsprinkle
Publicado em: 2007
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5. Nanoparticle self-assembly using patterns formed by dewetting / Auto-organização de nanoparticulas utilizando padrões formados por transição de molhabilidade
In this work, we study an original method to promote self-assembly of gold and silica nanoparticles using patterns formed by dewetting of aqueous solutions of poly (N-isopropylacrylamide) (PNIPAM) and sodium dodecylsulfate (SDS). Dewetting is a process where the free surface of an initially stable thin liquid film becomes unstable and deforms to engender rup
Publicado em: 2007
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6. DinÃmica da Ãgua em solo cultivado com feijÃo caupi em regiÃo de Brejo de altitude / WATER DYNAMIC IN THE SOIL CULTIVATED WITH COWPEA IN MOUNTAIN REGION
A good understanding of water dynamic in soil during the crop development is essential for improvements in practices aiming the productivity optimization. This way, the current work had the objective to evaluate the water dynamic in the soil cultivated with the cowpea crop growing in the mountain region of Paraiba, Brazil (âBrejo Paraibanoâ), at two differ
Publicado em: 2007
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7. Spatial and temporal evaluation of water balance processes in a soil with citrus / Avaliação espaço-temporal de processos do balanço de água em um solo com citros
The objective of the present work was to quantify and characterize spatial and temporal variability of water storage, matric potential, water flux density and actual evapotranspiration in an oxisol cropped to citrus. The experimental plot consisted of two transects with 20 observation points in a spacing of four meters. Each observation point was located in
Publicado em: 2006
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8. Produtividade de biomassa e interaÃÃes Ãrvore-cultivo em sistemas agroflorestais no Agreste da ParaÃba
Agroforestry systems, such as alley cropping or the implantation of glricidia hedgerows (Gliricidia sepium), are being adopted in agricultural family properties in the rural area of ParaÃba with the objetective of bettering soil fertility and increasing cattle breeding productivity. However, studies regarding the dynamics of nutrients, water and biomass pro
Publicado em: 2006
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9. Distribuição espacial dos parâmetros da equação da condutividade hidráulica em função da umidade do solo / Spatial distribution of the parameters of the equation relating hydraulic conductivity to soil water content
O objetivo do presente trabalho foi estudar a variabilidade espacial dos parâmetros da equação da condutividade hidráulica determinada no campo em função do conteúdo de água no solo, pelo método do perfil instantâneo, e avaliar a estabilidade temporal da armazenagem da água no solo, com vistas a identificação de um local de amostragem ótimo par
Publicado em: 2006
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10. The proton momentum distribution in water and ice
Deep Inelastic Neutron Scattering (Neutron Compton Scattering), is used to measure the momentum distribution of the protons in water from temperatures slightly below freezing to the supercritical phase. The momentum distribution is determined almost entirely by quantum localization effects, and hence is a sensitive probe of the local environment of the proto
Brazilian Journal of Physics. Publicado em: 2004-03
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11. BalanÃo hÃdrico e de energia em solo cultivado e sem vegetaÃÃo, para as condiÃÃes do brejo paraibano / Water and energy balance in the cultivated and bare soil in a montane area in paraiba, Brazil
In the areas of rainfed agriculture it is very important to quantify losses of water by evapotranspiration and soil evaporation. The methods used for measuring evapotranspiration and/or evaporation varies from direct measurements techniques, using lysimeters, to measurements of the water and energy balances. The precision lysimeters have high cost, being onl
Publicado em: 2004
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12. Citrus orchard water use in a latossolo vermelho amarelo (oxisol). / Consumo de água por cultura de citros cultivada em latossolo vermelho amarelo.
The agricultural yield and, particularly in this study, the citrus yield, associated to weather and soil conditions, is dependent on the presence of water and nutrients in the soil in appropriate amounts along the time. Its lack or excess is a limiting factor to the production, determining in many cases its decrease. The objective of the present work was to
Publicado em: 2003