Encontrados 16 documentos, a visualizar página 1 de 2
Modelos de regressão aleatória para descrição da curva de crescimento de codorn...
Bonafé,C.M.; Torres,R.A.; Sarmento,J.L.R.; Silva,L.P.; Ribeiro,J.C.; Teixeira,R.B.; Silva,F.G.; Sousa,M.F.Objetivou-se com este trabalho comparar diferentes modelos de regressão aleatória, ajustados por meio de funções polinomiais de Legendre de diferentes ordens, para avaliar o que melhor se ajusta ao estudo genético da curva de crescimento de codornas de corte. Os dados utilizados são provenientes de 26.835 e 27.447 observações, de 3.909 e 4.040 codornas de corte das linhagens UFV-1 e UFV-2. O peso corporal nas d...
Super-regenerative receiver at 433MHz
Carmo, J. P.; Ribeiro, J. C.; Mendes, P. M.; Correia, J. H.This paper presents a receiver for operation in the 433 MHz ISM band. The selected architecture explores the super regeneration phenomena to achieve a high sensitivity for applying in wireless implantable microsystems. This radio frequency (RF) chip can be supplied with a voltage of only 3 V for demodulating signals with powers in the range [ 100, 40] dB. The codulation (modulation and coding) scheme of the bi...
433 MHz implantable wireless stimulation of spinal nerves
Carmo, J. P.; Silva, M. F.; Ribeiro, J. C.; Mendes, P. M.; Correia, J. H.This paper presents a implantable wireless microsystem concept for operation in the 433 MHz ISM band. The proposed microsystem is composed by two independent subsystems: the electrostimulation and the radio frequency (RF) subsystems. The electrostimulation part is a silicon box with groves to pass the nerves to be stimulated. The cover of the silicon box contains electrodes for electrical contacting with the ne...
Capacidade de sobrevivência e dispersão de Diachasmimorpha longicaudata, um par...
LEAL, M. R.; AGUIAR-MENEZES, E. de L.; LIMA FILHO, M. RIBEIRO, J. C.; R.MENEZES, E. B.2008
Reduction efficiency prediction of CENIBRA's recovery boiler by direct minimiza...
Silva,W. L.; Ribeiro,J. C. T.; Costa Jr,E. F.da; Costa,A. O. S.daThe reduction efficiency is an important variable during the black liquor burning process in the Kraft recovery boiler. This variable value is obtained by slow experimental routines and the delay of this measure disturbs the pulp and paper industry customary control. This paper describes an optimization approach for the reduction efficiency determination in the furnace bottom of the recovery boiler based on the...
Infestação de Tunga penetrans siphonaptera: Tungidae em cascos de vacas leiteir...
Ribeiro,J.C.V.C.; Coelho,S.C.; Ruas,J.R.M.; Lana,A.M.Q.; Carvalho,A.U.; Facury Filho,E.J.; Saturnino,H.M.; Reis,R.B.Tunga penetrans rate of infestation in hooves of confined F1 Holstein-Zebu cows during the dry season was recorded. First parturition cows showed an infestation rate of 90.5% in the thorax and 96.9 in the pelvic members, second parturition cows showed an infestation rate of 95.3% in the thorax and 100% in the pelvic members while third parturition cows showed rate of infestation of 100% for both members.
Wireless interface for sensors in smart textiles
Ribeiro, J. C.; Oliveira, S. M.; Mendes, P. M.; Correia, J. H.This paper describes a smart suit with sensors and electronics for monitoring patients at hydrotherapy sessions in swimming-pools. The smart suit allows the monitoring of the heart rate, patient posture and activity level. The sensors input are converted in a PWM using a V-F converter. A robust, low-voltage (3.0 V) and low-power electronic wireless CMOS RF interface was implemented at 433 MHz using ASK modulation.
Estudo técnico e econômico de um sistema de produção de leite com gado mestiço ...
Moraes,A.C.A.; Coelho,S.G.; Ruas,J.R.M.; Ribeiro,J.C.V.C.; Vieira,F.A.P.; Menezes,A.C.Avaliaram-se a viabilidade técnica e a rentabilidade de um sistema de produção de leite com gado mestiço, mediante análise de custos e receitas da atividade e avaliação da rentabilidade. Os dados foram obtidos de uma unidade experimental da EPAMIG, situada no município de Felixlândia, MG, e referem-se a dois períodos iguais de um ano cada. As variáveis analisadas foram: rentabilidade nos períodos de análise, cu...
Biological microsystem for measuring uric acid in biological fluids
Minas, Graça; Martins, Júlio S.; Ribeiro, J. C.; Wolffenbuttel, R. F.; Correia, J. H.This paper describes a biological microsystem (bio-system) for measuring uric acid concentration in serum, plasma or urine. Its operation is based on optical absorption in a well-defined part of the visible spectrum. The bio-system is composed by two dies: one is fabricated in polystyrene and contains the microchannels and the other is fabricated in a CMOS standard process and contains the photodetector and rea...
An array of fabry-perot optical-channels for biological fluids analysis
Minas, Graça; Ribeiro, J. C.; Martins, Júlio S.; Wolffenbuttel, R. F.; Correia, J. H.This paper describes a biosystem (biological system) used to measure the concentration of biochemical substances in urine, serum, plasma or cerebrospinal fluid. Rather than just one channel, it comprises 16 optical-channels that enable the measurement of the concentration of 16 different biochemical substances. An array of 16 optical filters based on Fabry-Perot thin-films optical resonators has been designed. ...
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