Illumination Angle
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Hydrophobicity Classification of Polymeric Insulators Based on Embedded Methods
Hydrophobicity is an important parameter to characterize electrical properties of insulated materials. Therefore, it is an urgent task to develop on-line instruments to identify the hydrophobicity of insulated material's surface conveniently, quickly and accurately. For this purpose, a novel evaluation system with image processing and decision tree is propos
Mat. Res.. Publicado em: 2015-02
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2. Indices de vegetacao no sensoriamento remoto da cultura do feijao.
As aplicacoes de sensoriamento remoto em estudos de culturas agricolas tem feito uso extensivo dos indices de vegetacao (IVs). Constituidos de duas ou mais bandas, servem para realcar as feicoes de vegetacao e ao mesmo tempo minimizar efeitos espurios, como solos ou efeitos angulares, ou ainda efeitos atmosfericos. Nao se formou ainda opiniao unanime sobre a
Pesquisa Agropecuaria Brasileira. Publicado em: 2011
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3. Hydrophobicity classification in high voltage polymeric insulators / Classificação da hidrofobicidade em isoladores elétricos poliméricos de alta tensão
The aim of this study is to propose a new method to classify the hydrophobicity (HC) in high voltage polymer insulators. Currently the HC is based on the STRI guide (Swedish Transmission Research Institute) published in 1992, where the hydrophobicity is classified by contact angle and/or amount of wet surface. In the proposed method, the HC was analyzed by d
Publicado em: 2009
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4. Influência do solo de fundo e da geometria da radiação na resposta espectral da cultura do feijão / Soil background and radiation geometry influence on spectral response in bean crop
The objective of this study is to understand the relationships among the NDVI (Normalized Difference Vegetation Index), the PVI (Perpendicular Vegetation Index) the SAVI (Soil Adjusted Vegetation Index) and the illumination geometry, the view angle geometry and the soil background. In order to observe the influence of these parameters, we setup a field exper
Publicado em: 1994
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5. Orientation-dependent visibility of long thin objects in polarization-based microscopy.
Under conditions of directional illumination, the visibility of long, thin objects depends very strongly on the direction and polarization of the incident light. Solutions to Maxwell's equations for the case of an infinite cylinder in an electromagnetic field are well known, and have been used by others in the past for theoretical analysis of light scatterin
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6. Reflectance and Transmittance of Light by Leaves
Spectrophotometric transmittance and reflectance curves were recorded for wavelengths from 0.45 (in some cases 0.34) to 2.7 micrometers for faces and backs of leaves and for stacked leaves of several plant species. Measurements were made at different angles of illumination. Leaf spectrophotometric curves were compared with curves for leaf extracts, potato tu
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7. Slit-lamp measurement of the anterior chamber depth.
A technique is proposed which allows assessment of the anterior chamber depth with a standard table slit-lamp without any extra attachments. A final approximation is made which suggests that a 1 degree change in the angle between the observation and illumination systems of the slit lamp when the end point is reached indicates a change in anterior chamber dep
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8. Control of sarcomere length in skinned muscle fibres of Rana temporaria during mechanical transients.
A new technique is described for high-speed measurement of striation spacing of single skinned muscle fibres. A galvanometer mirror directs helium-neon laser light on to the muscle fibre at a variable angle. Light diffracted by the cross-striations is collected by a position-sensitive photodetector. The incident angle necessary to centre the diffracted light
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9. Changes in differential threshold in patients with glaucoma during prolonged perimetry.
Patients with chronic open-angle glaucoma and others suspected of having glaucoma were subjected to continuous contrast threshold measurement by automatic and manual perimetric techniques. The results show that an increase of contrast threshold over time is a frequent finding in glaucoma patients and that this increment can be large, especially at points clo
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10. Simple method for distinguishing gonococcal colony types.
Gonococcal colony types can be distinguished by a new procedure that makes use of a dissecting microscope with a concave mirror and a fluorescent lamp. Critical adjustment of the mirror angle results in illumination similar to that obtained in the dark-field microscope. When the concave mirror is set at a certain angle, colonies of the lenticular types 1 and
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11. Phytochrome-controlled Nyctinasty in Albizzia julibrissin: III. Interactions between an Endogenous Rhythm and Phytochrome in Control of Potassium Flux and Leaflet Movement 1
Prolonged irradiation during appropriate parts of the diurnal cycle promotes the opening of Albizzia julibrissin leaflets. Leaflets also open without illumination, but such opening starts later and is slower and less complete. Opening in the dark is accompanied by lower potassium efflux from dorsal pulvinule motor cells but equal or greater potassium movemen
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12. Circadian organization of the estrous cycle of the golden hamster.
In constant dim illumination the hamster estrous cycle free-runs with a period that is a quadruple multiple of the concurrently recorded rhythm of wheel-running activity; both activity and estrous cycles are generated by biological clocks. Maintenance of stable phase angle differences between heat onset and running onset before and after treatment with deute