Flux Of Photons
Mostrando 1-12 de 19 artigos, teses e dissertações.
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1. Effects of temperature, salinity and irradiance on carposporeling development of Hidropuntia caudata (Gracilariales, Rhodophyta)
The success of seaweed cultivation depends on the scientific control of the tolerance limits and the optimal physiological conditions that affect the spore germination and the early development of algal species. In order to establish cultivation techniques for spores of Hidropuntia caudata (J. Agardh) Gurgel & Fredericq, the effects of irradiance, salinity,
Revista Brasileira de Farmacognosia. Publicado em: 14/06/2012
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2. Relationships of photosynthetic photon flux density, air temperature and humidity with tomato leaf diffusive conductance and temperature
The objective was to study the leaf temperature (LT) and leaf diffusive vapor conductance (gs) responses to temperature, humidity and incident flux density of photosynthetically active photons (PPFD) of tomato plants grown without water restriction in a plastic greenhouse in Santa Maria, RS, Brazil. The plants were grown in substrate and irrigated daily. The
Brazilian Archives of Biology and Technology. Publicado em: 2012-06
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3. Growth and accumulation of carotenoids and nitrogen compounds in Gracilaria domingensis (Kütz.) Sonder ex Dickie (Gracilariales, Rhodophyta) cultured under different irradiance and nutrient levels
Effects of the interaction of irradiance and nutrient levels on growth and contents of photosynthetic pigments, carotenoids and proteins in Gracilaria domingensis (Kütz.) Sonder ex Dickie (Gracilariales, Rhodophyta) were investigated experimentally. Nutrient availability provided by dilutions of the nutrient solution of von Stosch (25 and 50%, which corresp
Revista Brasileira de Farmacognosia. Publicado em: 13/05/2011
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4. Transmissão e fluência de fótons na área de radiodiagnóstico para diferentes configurações de feixes e blindagens
Neste trabalho foi realizado um estudo da influencia das composições dos materiais de blindagem e variações nos espectros emitidos por equipamentos de raios X através da utilização de um programa computacional que utiliza a técnica de Monte Carlo. Foi determinada a fluência de fótons depois das blindagens, com geometrias realísticas de feixe prim�
Publicado em: 2010
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5. Análise multi-espectral dos eventos cíclicos de Carinae / Multi-spectral analysis of the cyclic events of Eta Carinae
In this thesis, a multi-wavelength study on the cyclic events of Eta Carinae was performed. The presence of a hole in the polar region of the Homunculus was confirmed by the velocity maps of the [Fe II] 12567 line. The blue-shifted component of the He I 10830, detected towards the NW lobe, was mapped and it is in the equatorial plane. It was observed that wi
Publicado em: 2009
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6. What are the high energy cosmic rays telling us?
We review in these notes the recent results of the Pierre Auger Observatory related to ultra high energy cosmic rays. We describe the components of the observatory and the status of its operation. The observations related here cover the correlation with astrophysical sources and its implications, as well as the determination of the spectrum at the higher end
Brazilian Journal of Physics. Publicado em: 2008-09
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7. Simulações do ruído de fundo instrumental e reconstrução de imagens do experimento protoMIRAX / Simulations of the instrumental background and image reconstruction of the protoMIRAX experiment
In this thesis, the results of detailed and realistic simulations performed with a Monte Carlo simulation code for gamma-ray Astronomy (MGGPOD) to predict the response of protoMIRAX are presented. The protoMIRAX is a project under development by the High Energy Astrophysics group of INPE, in which a hard X-ray camera is being built based on the coded apertur
Publicado em: 2008
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8. Dependência das propriedades da região-D ionosférica com o ciclo de atividade solar / Dependence of ionospheric D region properties on solar activity cycle
The goal of this work is to provide new clues for a better understanding of the quiescent ionosphere during different solar activity conditions. For that we study the lower ionospheric response to external perturbations, as solar X-rays emitted during flares. We use solar X-ray fluxes provided by GOES satellites, and ionospheric SPA (Sudden Phase Anomalies)
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/07/2006
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9. Fast neutral lithium beam for density and its fluctuation measurements at the boundary regions of ETE tokamak
A Fast Neutral Lithium Beam Probe (FNLBP) is being developed, in order, to perform measurement of the boundary plasma density in discharges of the Spherical Tokamak ETE, recently built at LAP/INPE. This plasma diagnostic method is adequate for use in fusion devices because it does not perturb the plasma and it provides data with high space and time resolutio
Brazilian Journal of Physics. Publicado em: 2002-03
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10. Protein microcrystal diffraction and the effects of radiation damage with ultra-high-flux synchrotron radiation.
By using ultra-high-flux synchrotron x-radiation from a wiggler source, good Laue diffraction data have been obtained from protein microcrystals of size 30 X 35 X 10 microns3, mounted wet in glass capillaries. At the flux level of 10(13)-10(14) photons per sec/mm2, the radiation damage is still low enough to allow a large survey of reciprocal space for a mic
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11. Gas Exchange Analysis of the Fast Phase of Photosynthetic Induction in Alocasia macrorrhiza1
When leaves of Alocasia macrorrhiza that had been preconditioned in 10 micromoles photons per square meter per second for at least 2 hours were suddenly exposed to 500 micromoles photons per square meter per second, there was an almost instantaneous increase in assimilation rate. After this initial increase, there was a secondary increase over the next minut
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12. Metabolic flux of cyclic GMP and phototransduction in rabbit retina.
1. Rabbit retinas were isolated and subjected in vitro to shifts between light and darkness in the presence or absence of four concentrations of the phosphodiesterase inhibitor 3-isobutyl-1-methylxanthine (IBMX). Changes in the rate of cyclic GMP hydrolysis (determined by 18O labelling of guanine nucleotide alpha-phosphoryls) and in total cyclic GMP content