Institutos Lactec

Curitiba, Brazil

Institutos Lactec

Curitiba, Brazil
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Kispergher E.M.,Secretaria de Estado de Saude do Acre | D'Aquino C.A.,Institutos LACTEC | da Costa Junior L.C.,Institutos LACTEC | de Mello T.C.,Institutos LACTEC | And 2 more authors.
Engenharia Agricola | Year: 2017

This study aimed to evaluate the effect of variations in organic load (hydraulic retention times - HRTs: from 2 to 0.5 day) and in alkalinity (NaHCO3 from 4,000 to 1,000 mg.L-1) on methane production. Biomass of sewage sludge was inoculated and stabilized on 1" polypropylene rings. The rings were immersed in the liquid phase (8.41 L) of an upflow anaerobic filter reactor (12.22 L). A solution of 5 g of whole milk powder per liter was used to simulate effluent from the dairy industry. Process effectiveness was measured by chemical oxygen demand reduction, biogas production, and biogas methane content. Biogas production started at a 2-day HRT and synthetic effluent alkalinization with 4,000 mg.L-1 NaHCO3. The best operation condition was at 1-day HRT and with the addition of 4,000 mg.L-1 NaHCO3. Biogas production reached 1.5 NL of biogas per L of reactor liquid phase, with 68% of methane and a concomitant reduction in COD of 57%.


Portella K.F.,Institutos Lactec | Mazur M.M.,Institutos Lactec | Mazur M.M.,Federal University of Paraná | Braganca M.O.G.P.,Institutos Lactec | And 5 more authors.
Construction and Building Materials | Year: 2017

The efficacy of the pulsed DC plasma method in the mitigation of the aggregate alkali reaction, by the deposition of thin films of Al, Ti and Fe nanomaterials on potentially reactive aggregates was investigated from analytical techniques. These included field emission scanning electron microscope, X-ray dispersive energy microprobe, electron back-scatter diffraction, Raman and the resulting expansion in the modified accelerated mortar-bar method. In the 30 days of the test, the values of expansion were obtained in samples with in nature aggregates of (0.77 ± 0.03)% and in those treated of (0.16 ± 0.01)%, (0.16 ± 0.01)% and (0.16 ± 0.00)%, respectively. © 2017


Bianchin C.G.,Institutos Lactec | Gules R.,Federal University of Technology
2016 12th IEEE International Conference on Industry Applications, INDUSCON 2016 | Year: 2017

This paper presents the development of a three-phase system for fast charging electric vehicle batteries, with high input power factor, high frequency isolated and reduced current efforts. The fast charging system is essential because of widespread growth in the use of this type of vehicle. The proposed system is based on a single-stage structure by integrating the three-phase rectifier stage with a DC-DC high frequency isolated converter. It was carried out a project and results will be presented and discussed. © 2016 IEEE.


Daemme L.C.,Institutos LACTEC | Penteado R.,Institutos LACTEC | Da Silva Costa D.,Institutos LACTEC | Ferreira R.S.,Institutos LACTEC | And 2 more authors.
SAE Technical Papers | Year: 2015

Gasoline direct injection (GDI) vehicles are considered to be one of the solutions for engine optimization with regard to fuel consumption. This combustion system potentially provides, depending on the duty cycle, an improvement in fuel economy of 5 - 10%. In Brazil, mainly due to new requirements to reduce consumption imposed by the Inovar Auto automotive regime, this technology is becoming more popular and in 2013 the first flexfuel GDI vehicle was produced. However, GDI engines tend to produce more particulate matter compared to conventional engines. The present article is based on the study of particulate matter emissions from a GDI vehicle tested according to the FTP75 (Federal Test Procedure 75) and HWFET (Highway Fuel Economy Test) cycles. The vehicle was fuelled with gasoline (A22) and with hydrated ethanol (HER). It was observed that the particulate matter formed after the combustion process is directly related to the fuel properties. Moreover, when the vehicle is fuelled with A22, the particle size tends to be ten times smaller compared to HER. The results indicate that the particles adhered to the filter size around 2 microns and its composition revealed that they have higher concentrations of fluorine and carbon and minor amounts of silicon and oxygen compared with a baseline. It was also observed in most filters one agglomeration of particles with sizes smaller than 0.5 microns. Regarding the total PM mass it was observed that emissions from A22 gasoline exceed the ones from HER. It was also observed that PM emissions from HWFET cycle are higher compared to the FTP 75 cycle. Copyright © 2015 SAE International.


Da Silva G.C.,Institutos Lactec | Munaro M.,Institutos Lactec | Junior S.R.,Institutos Lactec | Araujo D.B.,Institutos Lactec | And 3 more authors.
Proceedings of the IEEE Power Engineering Society Transmission and Distribution Conference | Year: 2016

Spacer cable system has been widely used in Brazil in low polluted areas such as rural and urban areas. However, Brazilian national standards do not recommend installing spacer cable systems in medium and high polluted areas due to the accelerated aging of the electrical equipment and accessories. In this paper is presented the evaluation of alternatives for the use of spacer cable system in these areas by using new materials on the interface between the covered conductor and the spacer. Other components evaluated were porcelain and polymeric insulators. Besides the standard configuration, different materials were applied on the interface between the cable and the spacer: semiconducting tubes on the cable, autofusion semiconducting tape on the cable and semiconducting tape on the spacer. These materials were submitted to multiple stress tests and its performance were evaluated by visual inspections and leakage current measurements. © 2016 IEEE.


Sucharski G.B.,Federal University of Paraná | Pukasiewicz A.G.M.,Federal Technological University of Paraná | Vaz R.F.,Institutos Lactec | Paredes R.S.C.,Federal University of Paraná
Soldagem e Inspecao | Year: 2015

HVOF thermal spray process produces coatings with low porosity and low oxide content, as well as high substrate adhesion. Small variations on the parameters of the HVOF process can generate coatings with different characteristics and properties, which also is chemical composition depended of the alloy. FeMnCrSi alloy is a cavitation resistant class of material with a great potential for HVOF deposition use. The main goal of this article is to study the influence of some HVOF parameters deposition, as standoff distance, powder feed rate and carrier gas pressure on three different alloys. FeMnCrSi experimental alloys with some variations in nickel and boron content were studied. Taguchi experimental design with L9 orthogonal array was used in this work. Porosity, oxide content, tensile adhesion strength and microhardness of the coatings were evaluated. The results indicated that all factors have significant influence on these properties. Chemical composition of the alloys was the most important factor, followed by the carrier gas pressure, standoff distance and powder feed rate. The addition of Ni, produces coatings with lower levels of oxide content and porosity. An experiment with improved parameters was conducted, and a great improvement on the coating properties was observed. © 2015, Universidade Federal de Uberlandia. All rights reserved.


Souza-Bastos L.R.,Federal University of Paraná | Bastos L.P.,Institutos LACTEC | Carneiro P.C.F.,EMBRAPA - Empresa Brasileira de Pesquisa Agropecuária | Freire C.A.,Federal University of Paraná
Aquaculture | Year: 2016

The use of salt in the management and culture of freshwater fishes is a quite common practice, either to fight infection or to possibly reduce the stress of transport, through reduction in the metabolic cost of hyper-regulation. Increased salinity, depending on the salt concentration used and the species, can be in itself a stress factor. This study aimed at evaluating and comparing the physiological effects of exposure to increased salinity in P. mesopotamicus (Pacu), C. macropomum (Tambaqui) and their hybrid (Tambacu), as well as to test the resistance of the hybrid when compared to its two parent species. Fishes (n = 38 each) were submitted to 5, 15, and 25 psu for 1 h. Osmolality, ions, and glucose were assayed in plasma, tissue hydration levels were quantified in gills and muscle, carbonic anhydrase activity (CAA) was assayed in gills and kidneys, and the expression of heat shock proteins (HSP70) was evaluated in muscle. All 3 fishes showed similar disturbance in osmotic homeostasis when exposed to 25 psu; the tambaqui displayed higher glycemia than the other fishes, in 15 and 25 psu. In this salinity the fish showed increased osmolality, Na+, Cl− and Mg2 + concentrations, as well as a reduction in muscle hydration. The tambacu showed lower potassium and higher magnesium in 25 psu than the other fishes. CAA was variably sensitive to salinity in the two species and the hybrid. No effects of salinity on tissue HSP70 expression were observed. Tambacus are similar in robustness to their parent species. The markers investigated showed that the three fishes tolerate exposure for 1 h at 10 psu; this concentration can be used for prophylactic or anesthetic purposes, but should not be exceeded, as it can offer significant homeostatic challenges to these fishes. Statement of relevance Rare studies on the comparative physiology of parent species and their hybrid, with commercial interest. © 2016 Elsevier B.V.


Braganca M.O.G.P.,Federal University of Paraná | Braganca M.O.G.P.,Institutos Lactec | Portella K.F.,Institutos Lactec | Bonato M.M.,Federal University of Paraná | Marino C.E.B.,Federal University of Paraná
Construction and Building Materials | Year: 2014

Samples of reinforced mortar specimens (Sps) were studied over 300 days of exposure in reference, sulfate, and chloride environments. Electrochemical impedance spectroscopy (EIS) was used to investigate external sulfate attack (ESA) in comparison with known chloride models. The study, based on the mortar behavior and its measured electrical properties, highlighted the mechanisms that occur under the pores during the aging. The sulfate samples presented a capacitive behavior at lower frequencies, and the mortar resistance shifted. It was confirmed that EIS is a qualified technique to identify the sulfate attack in concrete by non-destructive methods. © 2014 Elsevier Ltd. All rights reserved.


Braganca M.O.G.P.,Federal University of Paraná | Braganca M.O.G.P.,Institutos Lactec | Portella K.F.,Institutos Lactec | Bonato M.M.,Federal University of Paraná | And 2 more authors.
Construction and Building Materials | Year: 2016

Concretes with 1% nano-Fe3O4 addition aged for 300 days in chloride and sulfur dioxide chambers were analyzed by multiple technics and the performance results were evaluated by impedance spectroscopy and cyclic voltammetry. They exhibited a higher electrochemical stability because of the absence of passive film breakdown and an enhanced electrical resistance to charge transfer. The better properties were resulted from a more homogeneous microstructure produced by the byproducts of the reaction between the cement hydrates and the added nano-material. They were supposed be accumulated in pores and voids. © 2016 Published by Elsevier Ltd.


Eggea R.F.,Mestrado Profissional Institutos Lactec | Ferreira M.,Mestrado Profissional Institutos Lactec | Aoki A.R.,Institutos Lactec | Riella R.J.,Institutos Lactec
2015 IEEE PES Innovative Smart Grid Technologies Latin America, ISGT LATAM 2015 | Year: 2015

Power systems are undergoing fundamental changes, with emphasis on low-carbon and responsibility on the demand side. This transformation consists on modernization of generation, transmission, distribution and consumer technologies, providing to consumers more participation in managing their energy usage and generation through medias that are part of everyday life, as applications on mobile devices. This paper presents methods for monitoring and controlling the energy consumption and generation using photovoltaic system with energy storage in Smart Grid through a mobile application. It proposes energy consumption's analysis methods, establishment of goal of energy consumption, means to load and storage energy control. The mobile application is presented along with its functional description. Through this application, the costumer may visualize its energy consumption and generation data in a time of use tariff and use this information to support decisions to control its smart plugs and energy storage through schedules. © 2015 IEEE.

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