Avelino P.M.,Instituto Federal do Tocantins |
Restle J.,Federal University of Goais
Revista Ciencia Agronomica | Year: 2011
The objective of the experiment was to evaluate the agronomic characteristics of two sorghum hybrids for silage production, AG-2005 (double purpose) and VOLUMAX (forage) cultivated with different row spacing 1; 0.75 and 0.50 m, on Orthic Quartzarenic Neosol, resulting in 140,000; 186,666 e 280,000 plants per ha, respectively. A randomized block design with four replicates was used and the treatments consisted on a factorial arrangement 2 x 3. Were determined the total dry matter production (PMST), of leaves (PMLF), of stems (PMSC), and panicles (PMSP) per ha, and their proportion in the whole plant. Significant interaction occurred between sorghum hybrid and row spacing for PMST, PMSLF and PMSP. VOLUMAX showed similar production for the three row spacing. AG-2005 showed higher PMST (9,474.59 vs. 6,842.91 kg ha-1) and PMSP (6,355.77 vs. 3,032.40 kg ha-1) than VOLUMAX in 0.50 m row spacing. AG-2005 was superior to VOLUMAX for the percentage of panicles in 1 m (57.06 vs. 40.22%) and 0.50 m spacing (66.99 vs. 43.55%), and VOLUMAX was superior for stems percentages in the 1 and 0.50 m spacing. It is recommended the use of hybrid AG-2005 under spacing of 0.50 m for silage production, due to its higher dry matter production per area, higher percentage of panicle and lower percentage of stem in the composition of the plant compared to the hybrid VOLUMAX.
Nascimento R.S.M.,Federal University of Viçosa |
Lopes E.A.,Federal University of Viçosa |
Dos Santos C.E.M.,Federal University of Viçosa |
Magalhaes V.M.B.S.,Federal University of Viçosa |
Cardoso J.A.,Instituto Federal do Tocantins
Crop Breeding and Applied Biotechnology | Year: 2016
The host status of eighteen progenies (CRP 01-12 to CRP 16-12, CRP 19-12 and CRP 20-12) and two cultivars (FB 200 Yellow Master and FB 300 Araguari) of yellow passion fruit to Meloidogyne incognita race 2 was evaluated in a greenhouse experiment. The height and the biomass of the plants, besides the numbers of galls, eggs and second-stage juveniles in roots and soil were assessed after 70 days of cultivation of the genotypes and tomato (control) in plastic pots with 2 kg of soil infested with 5,000 eggs of the nematode. The reproduction factor of the pathogen (RF = Final population/Initial population) was calculated for classifying the genotypes as immune (RF = 0), resistant (RF < 1) or susceptible (RF ≥ 1). The cultivar FB 200 is resistant to M. incognita race 2 and can be cultivated in areas infested with this nematode. © 2016, Brazilian Society of Plant Breeding. All rights reserved.
Silva S.B.,Instituto Federal do Tocantins |
Silva S.B.,University of Brasilia |
Severino M.M.,University of Brasilia |
De Oliveira M.A.G.,University of Brasilia
Renewable Energy | Year: 2013
Abstract: This paper aimed to evaluate the use of a photovoltaic-fuel cell-battery system to supply electric power in an isolated community in the Amazon region. The study focused on technical and cost issues of a pilot-project set up in an environmental protection area, located in the state of Tocantins, Brazil. A comparative analysis of the costs of the hybrid system after optimization was made with the aid of the HOMER© (Hybrid Optimization Model for Electric Renewables) program. The analysis shows that the optimal system's initial cost, net present cost, and electricity cost with the hydrogen storage system is US$ 87,138; US$102,323; and US$ 1.351/kWh, respectively. Components are costly (fuel cell and electrolyzer), with the photovoltaic modules and the electrolyzer presenting the main cost of system. Based on the results, the study confirmed that the best option for storing energy from photovoltaic systems is still the use of batteries. In the short term, implementation of hybrid photovoltaic-fuel cell-battery system in the region remains prohibitive due to the high cost of its components. © 2013 Elsevier Ltd.
Moura G.M.,Federal University of Maranhão |
Moura G.M.,Federal University of Pará |
Carvalho J.O.,Federal University of Maranhão |
Carvalho J.O.,Instituto Federal do Tocantins |
And 3 more authors.
Materials Chemistry and Physics | Year: 2015
l-Histidinium bromide monohydrate (LHBr) single crystal is a nonlinear optical material. In this work the high temperature phase transformation and the thermal stability of single crystals of LHBr was investigated by X-ray diffraction, thermogravimetric analysis, differential thermal analysis, differential scanning calorimetry and Raman spectroscopy. The results showed the LHBr phase transformation of orthorhombic (P2 1 2 1 2 1 ) to monoclinic system (P 1 2 1) at 120°C, with the lattice parameters a=12.162(1)Å, b=16.821(2)Å, c=19.477(2)Å and β=108.56(2)°. These techniques are complementary and confirm the structural phase transformation due to loss water of crystallization. © 2015 Elsevier B.V.
Cardoso S.R.S.,São Paulo State University |
Cardoso S.R.S.,Instituto Federal do Tocantins |
Forti L.C.,São Paulo State University |
Nagamoto N.S.,São Paulo State University |
Camargo R.S.,São Paulo State University
Sociobiology | Year: 2014
Most ants, as leaf cutting ants, construct nests underground to maintain environmental conditions favorable to the development of immature and adult individuals. But there was little works about this, especially doing comparison of nest growth among leafcutting ant species. Thus, we studied the growth of nests of the leaf-cutting ants Atta bisphaerica and Ata sexdens rubropilosa from nest foundation until the appearance of a second chamber. To this end, we verified the measurements of the chamber recently constructed by the queen and monitored its growth in the initial phase of nest development. The nests were marked immediately after nuptial flight, with 40 nests of each species being dug at 45, 90, 135, 180, and 225 days afterwards. As a result, it was found a first time statistical demonstration that an ellipsoid chamber shape was verified in both species in the initial chamber at 45 days, and that, after, these chamber became spherical. In general, chamber size increased and format change was found in both species. The depth of the first chamber was found to increase significantly only in A. bisphaerica; this result means that this chamber growths downside rather than upside. The occurrence of a second chamber was verified from six months after nest foundation, in both species. Our study contributes to knowledge of the colony development for up to 1 year, by performing comparison of two leaf-cutting ants species.
Fialho F.T.,Federal University of Vales do Jequitinhonha and Mucuri |
Villela S.D.J.,Federal University of Vales do Jequitinhonha and Mucuri |
De Paula Leonel F.,Federal University of Säo João del Rei |
Tamy W.P.,State University of Norte Fluminense |
And 2 more authors.
Revista Brasileira de Zootecnia | Year: 2015
The objective was to study the kinetics of transit and degradation of the fiber from guinea grass and the waste from soybean pre-cleaning (WSPC), ensiled with different proportions of mass (0, 100, 150, and 200 g WSPC/kg total mass). Four crossbred (Gyr × Holstein), fistulated cattle with an average body mass of 400±50 kg were organized in a 4 × 4 Latin square experimental design. The fiber utilized in the study of the transit kinetics was stained with chromium mordant, whereas the in situ technique was adopted for the degradation kinetics. The level of inclusion of WSPC only affected the true digestibility and the mean retention time. The addition of waste from soybean pre-cleaning to the silage of guinea grass is beneficial, in terms of kinetics of digestion and passage, at up to levels close to 100 g/kg, because after this quantity the fiber digestion and passage in and through the reticulo-rumen are impaired and there may be alterations in the ruminal environment that will affect the use of silage by animals. © 2015 Sociedade Brasileira de Zootecnia.
Victor V.F.,Instituto Federal do Tocantins |
Quintaes F.O.,Federal University of Rio Grande do Norte |
Lopes J.S.B.,Federal University of Rio Grande do Norte |
Junior L.D.S.,Federal University of Rio Grande do Norte |
And 2 more authors.
IEEE Transactions on Magnetics | Year: 2012
This paper shows the analysis and study of a bearingless ac Motor type divided winding for a conventional squirrel cage induction motor, (IM). The conventional IM is used as a bearingless motor for artificial-lift oil proposes, allowing a reduction in maintenance and operation costs. The goal of this paper is improving electromagnetic forces performance, such as the Lorentz and Maxwell forces, allowing rotor positioning at the rotation axis. It was used a simulator based on the finite element method for acquiring load results for a 3,75 kW, 380 V, 4-poles, 60 Hz, 1.04 Nm, IM motor. Experimental results show that is possible to use a conventional IM as a bearingless motor, achieving a 80% efficiency. This paper presents simulated and experimental results that demonstrated the operation of the IM bearingless-type split coil built from a conventional induction motor. © 2012 IEEE.
Souza L.F.,Federal University of Goais |
Souza L.F.,Institute Criminalistica Leonardo Rodrigues |
Vieira T.S.,Federal University of Goais |
Vieira T.S.,Instituto Federal do Tocantins |
And 2 more authors.
Journal of the Brazilian Chemical Society | Year: 2016
Illicit substances found in blotter papers and tablets seized by police are traditionally identified and characterized from extracts of these materials. However, the procedures involved in extraction stages can result in artifacts and even contamination of the samples to be analyzed. On the other hand, high-resolution magic angle spinning nuclear magnetic resonance (HR-MAS NMR) is a technique that requires no pretreatment steps, enabling direct analysis of the material, including the analysis of new illegal synthetic psychoactive substances. This study presents and discusses applications of the HR-MAS NMR in the analysis of tablets and blotter papers seized. Additional analysis in solution of the extracts of these materials was performed to compare the obtained spectral resolution signals. The results demonstrated that the HR-MAS NMR allowed the rapid identification of 3,4-methylenedioxy-N-methylcathinone (methylone), 4-methylmethcathinone (mephedrone), 2,5-dimethoxy-4-bromoamphetamine (DOB) and 2-(4-bromo-2,5-dimethoxyphenyl)-N-[(2-methoxyphenyl)methyl]ethanamine (25B-NBOMe) in samples of tablets and blotter papers seized in Goiás State, Brazil. ©2016 Sociedade Brasileira de Química.
Study of the limitations imposed by the zeros of the OLTF of supplementary controllers on the damping of eletromechanic oscillations [Estudo das limitações impostas ao amortecimento de oscilações eletromecânicas pelos zeros da f™a de controladores suplementares]
De Moura R.F.,Instituto Federal Do Tocantins |
Furini M.A.,Federal University of São Paulo |
De Araujo P.B.,São Paulo State University
Controle y Automacao | Year: 2012
The main objective of this work is to analyze the influence of different input signals for supplementary damping controller (POD - Power Oscillation Damping) on the location and control of FACTS devices UPFC (Unified Power Flow Controller), in order to damp low frequency oscillations in Electric Power System (EPS). Will analyze three input signals, two signals available locally (electric current and power flow in UPFC line installation) and a remote signal (angular velocity). To this purpose, the Power Sensitivity Model (PSM) is used to represent the EPS. In the usual way, a sensitivity analysis, using the residue method, provides the location for installation of the UPFC/POD and the procedure for setting the parameters of the controller to damp a pole of interest. However, it will be shown in this work due to the proximity of a zero to an eigenvalue of interest, the largest residue does not necessarily provide the best location for all UPFC / POD, as observed more frequently in local signals. Comparative analyses of efficiency of input signals to the POD are presented to the New England system with 10 generators, 39 buses and 46 transmission lines.
Tamashiro M.A.,Instituto Federal Do Tocantins |
Guimaraes G.C.,Federal University of Uberlandia |
Rodrigues A.R.,Instituto Federal Of Minas Gerais |
Monteiro R.V.A.,Federal University of Uberlandia |
And 2 more authors.
IEEE Latin America Transactions | Year: 2016
The ATP-EMTP has become a reference program for electromagnetic transients computer simulations. Due to the contributions of its officers users groups spread around the world, several improvements were made and additional resources have been developed to facilitate and expand its application. Tools, like ATPDraw, PlotXY, TACS, DBM and MODELS, can drive and enable excelent research studies which may result in internationally renowned scientific papers in the field of Electrical Systems. It is then presented in this paper an additional user guide for these tools with procedures tested in practice and often not covered by official manuals, combined with an analysis of the use of TACS/DBM and MODELS through the computational implementation of a speed governor. The purpose is to identify the potentiality as well as the advantages and disadvantages of TACS/DBM and MODELS. Thus, any user interested in the correct and effective use of these tools may determine the one most suitable to accomplish the computer simulation. © 2016 IEEE.