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The use of similarity images on multi-sensor automatic image registration
H. Gonçalves; J.A. Gonçalves; L. Corte-RealAutomatic image registration (AIR) is still a present challenge regarding remote sensing applications. Although several methods have been proposed in the last few years, geometric correction is often a time and effort consuming manual task. The only AIR method which is commonly used is the correlation-based template matching method. It usually consists on considering a window from one image and passing it throu...
Activity measurements of 192Ir solid sources using a well-type ionization chamber
Gonçalves, J. A. C.; Botelho, S.; Pascholati, P. R.; Ridenti, M. A.; Fraga, M. M. F. R.; Camara, J. R.; Calvo, W. A.; Bueno, C. C.This work presents the preliminary activity measurements of 192Ir solid sources, applied in industrial gammagraphy, produced by the Sealed Sources Laboratory in the Radiation Technology Center (CTR) at IPEN-CNEN/SP. The pellets' activity measurements were carried out with a well-type ionization chamber developed at CTR. The chamber current-voltage response was studied as a function of 192Ir activities ranging f...
Um caso de linfoma de Burkitt no adulto
Firmino, C.; Serviço de Cirurgia I, Hospital N.a Sra do Rosário-EPE, Barreiro.
Efeito do tratamento térmico nas modificações térmicas e quimicas das madeiras ...
Sousa, Raul Bruno de; Canas, Sara; Belchior, A.P.; Falcão, A.; Gonçalves, J.A.; Spranger, M. IsabelThe effects of temperature and frequency of moistening during the first phase of the heath treatment (bending phase) on the simultaneous response of different kinds of wood (Portuguese chestnut, Rumanian and American oak wood) used in brandy ageing were studied. The evolution of the wood temperature was measured by K thermocouple probes. The wood extractable compounds (phenolic acids, phenolic aldehydes, coumar...
Droplet size in a rectangular Venturi scrubber
Costa,M. A. M.; Henrique,P. R.; Gonçalves,J. A. S.; Coury,J.R.The Venturi scrubber is a device which uses liquid in the form of droplets to efficiently remove fine particulate matter from gaseous streams. Droplet size is of fundamental importance for the scrubber performance. In the present experimental study, a laser diffraction technique was used in order to measure droplet size in situ in a Venturi scrubber with a rectangular cross section. Droplet size distribution wa...
Electron field emission measurements from boron-doped CVD diamond on tantalum
Gonçalves,J. A. N.; Sandonato,G. M.; Iha,K.Boron-doped polycrystaline diamond films grown by hot-filament-assisted chemical vapor deposition were studied with ultraviolet photoemission spectroscopy (UPS), Raman spectroscopy, X-ray diffractometry and current voltage measurements. The UPS measurement shows that the work function (phi) without electric field is about 3.9 eV . The field-emission current-voltage measurements indicate a threshold voltage rang...
Effect of the drift field on avalanche gain and charge collection in microgap d...
Fraga, F. A. F.; Marques, R. Ferreira; Gonçalves, J. A. C.; Gonçalo, J. R.; Policarpo, A. J. P. L; Eijk, C. W. E. van; Hollander, R. W.One of the main drawbacks of the use of microgap structures when used at high pressure (6 bar) at high count rates (~106 s-1 mm-2) is the limited maximum safe gain at which they can be operated. The use of a preamplification device such as the GEM (gas electron multiplier) can overcome this limitation; however, secondary space charge effects due to charge accumulation at the non-metallic surfaces cannot be negl...
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