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Meios granulares e experimentos simples para a sala de aula
López, J.;Vercik, A.;Costa, E.J.X.;
Revista Brasileira de Ensino de Física , 2008, DOI: 10.1590/S1806-11172008000100009
Abstract: during last years there was a large experimental and theoretical activity in the study of the properties of granular materials. this article makes a brief revision of the literature on these topics and suggests artless experiments that the physics teacher can perform in the classroom.
Fiber Cement Composition Simulator Using Artificial Neural Networks
A.C.S. Silva,E.M. Bezerra,E.J.X. Costa,H. Savastano
Journal of Engineering and Applied Sciences , 2012,
Abstract: The backpropagation algorithm was utilized to implement a fiber cement composition simulator. Six predictors were used: Synthetic fiber supplier, content of synthetic fiber, supplier of the softwood cellulose pulp, refinement degree of softwood cellulose pulp, content of softwood cellulose pulp and refinement degree of hardwood cellulose pulp. The combination of the 6 predictors generated compositions that were used as the Artificial Neural Network (ANN) target in relation to the variables: modulus of rupture (y1), toughness (y2) and water absorption (y3) of the fiber cement composites at the total age of 28 days that were used as the neural network input. The ANN performance was 97.3 % of correct classification with kappa coefficients varying between 0.89 and 0.93. The results suggest that the ANN approach can be used to simulate the composite formulation based on mechanical and physical characteristics using historical data set from experimental results.
Uma análise de deslocamento de rebanho bovino através dos modelos random walk e browniano
Tech,A.R.B.; Arce,A.I.C.; Silva,A.C.S.; Costa,E.J.X.;
Archivos de Zootecnia , 2009, DOI: 10.4321/S0004-05922009000300003
Abstract: the present article simulate the movement of bovine herd through the aleatory movements random walk and brownian, trying to analyze which of those predicts the movement better of bovine herd displacement, defining parameters and describing the algorithms used in both movements and using them in the construction of the events of the simulator. with the construction of the simulator it was possible the analysis of the movements, besides the understand that model of displacement better if apply of bovine herd displacement. also it was possible an analysis of space acting for the construction of the location nets and identification of the herd through of wireless sensor network.
Monitorización de reba?os de bovinos a través de redes de sensores inalámbricos
Arce,A.I.C.; Tech,A.R.B.; Silva,A.C.S.; Costa,E.J.X.;
Archivos de Zootecnia , 2009, DOI: 10.4321/S0004-05922009000200010
Abstract: this paper presents a prototype system for monitoring bovine herds developed using electronic instrumentation and wireless techniques. it is able to acquire physiological data for ethological studies. the main stimulus of this work was the precision animal production researcher's interest in developing and testing new techniques that could allow data acquisition with less interference in animal behavior. in order to test the feasibility of the wireless sensor network technology in this area, an infrastructure was developed using electronic instrumentation and radio frequency wireless communication techniques. the network was projected to support the floating base sensor network protocol that is a special kind of adhoc topology with randomic selection of path nodes. the developed prototypes were used to acquire brain electrical activity and body temperature from bovines. in order to optimize the spatial distribution of the wireless networks infrastructure, a software to simulate herd displacement was developed for assist the achievement of minimum-cost for antennas distribution. the results obtained prove that the wireless sensor networks can be considered as an efficient technique to be used to acquire bovine's physiological data.
A wireless data acquisition system for cattle behavior monitoring in zootechnics E-Science
Tech,A.R.B.; Arce,A.I.C.; Silva,A.C.S.; Costa,E.J.X.;
Archivos de Zootecnia , 2012, DOI: 10.4321/S0004-05922012000200002
Abstract: this paper studies the feasibility of a system of monitoring and data collection via the web, with the construction of an e-science zootechnical. object-oriented modelling techniques were used and programming languages: php, c++, java and mysql database for development of the computing environment. the system hardware, electronic communication device, and monitoring protocols were developed using the float base sensor network protocol and techniques of electronic instrumentation. to test the system, an experiment was conducted with six holstein animals equipped with data collection devices. the experimental environment was equipped with six antennas and a fixed ip camera. the results showed the efficiency of the collection system and receiving data through the antennas distributed in the area. considering the methodology used in the project, as well as the results of the experiment, is possible conclude that, with the telemetric data collection in real time, the management and monitoring the animal during an experiment can be done, in addition to allowing free movement of the animal during the data collection.
Um modelo de gest?o baseado em e-science e data warehouse para aplica??o no agronegócio
Tech,A.R.B.; Arce,A.I.C.; Silva,A.C.S.; Pereira,L.A.M.; Costa,E.J.X.;
Archivos de Zootecnia , 2010, DOI: 10.4321/S0004-05922010000200001
Abstract: the present article describes an administration system applied to livestock that performs animal monitoring and identification by means of a wireless network. this system will allows animal monitoring during its life cycle and collection of telemetric data in real time. this data acquisition could be accomplished by means of an internet access. this kind of system may improve administration, productivity control, and animal quality, since it is able to manage certain data, such as: temperature, resting time, feeding time, etc., to complete a great database (data warehouse) that can be accessed by several researchers creating an e-science system.
Predi??o dos fracionamentos de proteínas de Brachiaria brizantha cv Marandu utilizando RNA
Brennecke,K.; Tech,A.R.B.; Arce,A.I.C.; Luz,P.H.C.; Herling,V.R.; Costa,E.J.X.;
Archivos de Zootecnia , 2011,
Abstract: this paper aims to connect morphogenetic variables of forage and climatic data, with protein fractions (a, b1, b2, b3 and c) through the artificial neural networks known as multi-layer perceptron, with three layers and algorithm training based on back-propagation of error gradient, in order to create a model to predict the protein fractions of fodder from their morphogenetic characteristics and climate. the data used for training and the test were collected in an experiment that was conducted on a 25.2 ha experimental area, located at 47o26'w, 21o59's, and with pasture composed of brachiaria brizantha cv marandu, in a completely randomized block, with four replicates and a forage allowance of 5% (5 kg of dry matter per 100 kg animal.day-1). each block was divided into four experimental units of 1.575 ha, with five paddocks of 0.315 ha each. samples were taken two days before the entry of animals, protein was analysed at laboratory to subsequently be compared with the values estimated by the network. thus, by comparing the output of the network and those obtained by laboratory analysis, it was possible to calculate the average error for fractions a, b1, b2, b3 and c proteins and, thus, can be concluded that the model mlp is able to efficiently predict protein fractions of brachiaria brizantha.
Tissue Distribution, Metabolism and Excretion of PGE1 Following Prolonged High-Dose Inhalation in Neonatal Pigs
B.G. Sood,X. Chen,E.J. Dawe,M. Malian
International Journal of Pharmacology , 2010,
Abstract: Inhaled prostaglandin E1 (IPGE1) is a potential selective pulmonary vasodilator in neonatal pulmonary hypertension. The objective of this study was to evaluate the bioavailability and metabolism of IPGE1. Anesthetized ventilated piglets received either high dose IPGE1 (1200 ng/kg/min) [Study group] or nebulized saline [Control group] using a jet nebulizer. PGE1 and its metabolite, 15-keto-PGE1, were quantified in blood, urine and lung tissue using high performance liquid chromatography-mass spectrometry. Fourteen piglets underwent the experimental protocol (age 1-9 days). Of these, nine received IPGE1 and five received nebulized saline. Among control pigs, two died of complications at 3-4 h, one at 12-13 h and the remaining two were euthanized at 24 h after start of aerosol. In the study group, three animals died after 14-15 h of aerosol treatment of iatrogenic complications and six animals received aerosol for 24 h. Plasma and urine PGE1 levels increased significantly over time in study (p<0.05) but not control animals. Plasma and urinary 15-keto-PGE1 levels and lung tissue prostaglandin profile were comparable in study and control animals. In conclusion, this is the first report of the tissue distribution, metabolism and excretion of prolonged high dose IPGE1. The increase in PGE1 levels in plasma and urine over time without accumulation in lung tissue or systemic side effects suggests effective aerosol delivery, extensive pulmonary metabolism and efficient excretory mechanisms.
Comparative Assessment of Stabilizers Used for Freeze-Drying T1/44 Contagious Bovine Pleuropneumonia Vaccine (CBPPV) Produce in Nigeria
E.J. Ngbede
Research Journal of Animal Sciences , 2012,
Abstract: The effect of using 85% buffered sucrose solution plus gelatin ("S") as stabilizer and a combination of buffered sucrose/lactalbuminhydrolysate solution in ratio 20:5% (w/w), respectively with gelatin ("L") as stabilizer during freeze-drying process and under varying storage temperature conditions on CBPP vaccine was investigated. It was found that both stabilizers gave good freeze-dried preparation of T1/44 CBPP vaccines. During the process of freeze-drying, there was a total average loss of 4.73 cfu mL 1viable organisms in vaccine with stabilizing medium "L" plus gelatin and an average loss of 5.25 cfu mL 1 viable organisms for vaccine with stabilizing medium "S" plus gelatin. The results favoured the choice of sucrose/lactalbuminhydrolysate plus gelatin stabilizer on viability of T1/44 Mycoplasma mycoides subsp. mycoides during freeze-drying process. Vaccine with stabilizing medium "L" plus gelatin stored at +4 C for 15 months maintained sufficient viable mycoplasma to protect cattle. The vaccine titre dropped from 1.5 109-4.3 107 cfu mL 1, while vaccine with stabilizing medium "S" plus gelatin for the same period dropped from 3.1 109-1.8 107 cfu mL 1. At room temperature of 25 C, the 2 types of vaccines maintained sufficient viable mycoplasma up to 4 months, but detrimental as the titre may drop suddenly when reconstituted for vaccination in the field. Storage of this vaccine at 37 C is not recommended for the same reason stated above.
Improved pores detection in fingerprints by applying ring led’s (525 nm)
E.J. Busselaar
Optica Applicata , 2010,
Abstract: The requirement to determine the identity of a person is becoming more and more important in the present information society. There are a number of biometric based identification and verification systems on the market for many civilian, military and forensic applications. Amongst the reliable biometric systems, fingerprint authentication plays a major role, as fingerprints are not just related to criminality anymore. Several automated fingerprint identification or verification systems dictate the market and some apply pores as additional feature to the traditionally applied minutiae systems to improve the system performance. There is, however, a financial trade off between detection of pores and the complexity of the applied optical system. In this paper, the impact of using strike light and the application of a specific wavelength to improve the reflection on the skin is presented to improve the imaging performance of existing automated fingerprint identification or verification systems (AFIS or AFVS). The results are fingerprint images with distinct pores necessary for the image and feature processing. With the introduction of computers it became possible to automate data of fingerprints. The template (original) fingerprint images are compared with the live scan images, resulting in a match score. This match score is defined in terms of the number of false accepts and false reject errors and determines the performance of the system. Despite the inverse relation of these error rates, the lower both rates, the better the system. The final result of the introduced unique features is a system with error rates significantly better than with systems applying standard prism based white light sensors. The application of all presently available fingerprint sensor systems has been extended significantly after the September 11-th incident.
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