Entity

Time filter

Source Type

Guarapari, Brazil

de Matos A.T.,Federal University of Vicosa | de Gariglio H.A.A.,FEAM | Lo Monaco P.A.V.,IFES
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2013

In order to evaluate the retardation factor, dispersion coefficient and diffusion-effluent curves of calcium, magnesium and potassium present in the vinasse, a laboratory experiment was conducted in soil columns of typical Distrophic Red Latosol (LVd), typical Eutroferric Red Latosol (LVef) and typical Distrophic Yellow Red Latosol (LVAd). The columns were connected to the Mariotte bottle containing distilled water and then the vials containing wastewater. The relative concentrations of the samples of the effluent corresponding to the respective pore volumes were used to obtain the experimental curves of the effluent for potassium, calcium and magnesium. To obtain the retardation factors (fR) and dispersion-diffusion coefficients (D) for the ions, the data of the effuent curves and the Disp 1.1 program were used. The highest values of fR were obtained for potassium in LVd, followed by calcium in the LVAd and lastly, the potassium in the LVAd. The lowest fR and D values for all studied ions were obtained in LVef. Magnesium showed the lowest values of fR and D in the three evaluated soils. Source


Carames T.R.P.,UFES | Daouda M.H.,University Abdou Moumouni | Fabris J.C.,UFES | Oliveira A.M.,IFES | And 3 more authors.
European Physical Journal C | Year: 2014

We formulate a theory combining the principles of scalar–tensor gravity and Rastall’s proposal of a violation of the usual conservation laws. We obtain a scalar–tensor theory with two parameters (Formula presented.) and (Formula presented.), the latter quantifying the violation of the usual conservation laws ((Formula presented.) corresponding to the General Relativity limit). The only exact spherically symmetric solution is that of Robinson–Bertotti besides the Schwarzschild solution. A PPN analysis reveals that General Relativity results are reproduced when (Formula presented.). The cosmological case displays a possibility of deceleration/acceleration or acceleration/deceleration transitions during the matter dominated phase depending on the values of the free parameters. © 2014, The Author(s). Source


Almonfrey D.,IFES | Konzen A.,Ferrari | Vassallo R.F.,Ferrari | Schneebeli H.J.A.,Ferrari
Journal of Control, Automation and Electrical Systems | Year: 2015

Color constancy is a problem of hard solution, and most of existing theories are applied only to synthesized images, while others present a limited performance when applied to real images. In this paper, we apply and analyze a color constancy algorithm that is used with real images subjected to sudden changes in illumination, both in outdoor and indoor environments. In this algorithm, by knowing the colors of some points on the scene submitted to a standard illumination, scene image color correction is made so that it appears always to be under the standard illumination influence. The method employed in this paper is applied to some tasks, such as tracking colored targets, controlling a robot using visual information and pre-processing outdoor images to help on place characterization. Moreover, the algorithm implemented in this work is camera independent because it does not depend on the camera-sensitive responses. The only requirement is that the camera responses can be approximated by the CIE XYZ $$2^o$$2o standard observer functions. The experimental results are discussed and analyzed in order to evaluate the performance of the color constancy method. © 2015, Brazilian Society for Automatics--SBA. Source


Naciuk F.F.,University of Campinas | Milan J.C.,University of Campinas | Andreao A.,IFES | Miranda P.C.M.L.,University of Campinas
Journal of Organic Chemistry | Year: 2013

Marine alkaloids caulibugulones A-D were synthesized in six steps starting from the readily available 2,5-dimethoxybenzaldehyde. Pomeranz-Fritsch reaction of N-(2,5-dimethoxybenzyl)-N-(2,2-dimethoxyethyl)-2-nitrobenzenesulfonamide proceeded smoothly to give 5,8-dimethoxyisoquinoline, which was oxidized to isoquinolinediones by a tunable oxidation reaction with N-haloimides. Therefore, NBS furnished direct conversion to the isoquinoline-5,8-dione; alternatively, N-haloimides of cyanuric acid provided both oxidation and halogenation generating 6,7-dihaloisoquinoline-5,8-diones. Aminolyses of these isoquinolinediones with methylamine or ethanolamine produced the isoquinolinedione alkaloids caulibugulones A-D in 24-57% overall yield. © 2013 American Chemical Society. Source


Ramos M.J.M.,EMPAER MT | Monnerat P.H.,UENF CCTA | Pinho L.G.R.,IFES
Revista Brasileira de Fruticultura | Year: 2013

The equipment Minolta SPAD-502 measures the intensity of green color of leaves and has been used in the quantification of chlorophyll, characterized by speed, simplicity, and especially by allowing a non-destructive evaluation of the leaf tissue. The objective of this study was to calibrate the SPAD reading and its correlation with the diagnosis of induced deficiencies of macronutrients and boron deficiencies involving the vegetative growth of the pineapple. The experiment consisted of eight treatments: complete, -N,-P, -K, -Ca, -Mg, -S and -B in randomized complete block with six replicates. It was evaluated the length and the width of the sheet "D" (marked) and readings taken with the SPAD 502 chlorophyll meter. The use of the method of indirect measurement of chlorophyll is suitable for assessing the nutritional status of N and vegetative growth of 'Imperial' pineapple. The value Spad and concentration of leaf N in the complete treatment are respectively: 75.7 and 14.8 g kg-1 and deficient in N: 36.6 and 9,7 g kg-1. With the exception of the deficiencies of N and P, the other treatments did not affect SPAD readings. Source

Discover hidden collaborations