Honnicke M.G.,Iguaçu University |
Godoi W.C.,Federal Technological University of Paraná |
Swinka-Filho V.,Institute Tecnologia Para O Desenvolvimento
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | Year: 2014
Dental X-ray films are still largely used due to sterilization issues, simplicity and, mainly, economic reasons. These films almost always are double coated (double emulsion) and have a lead foil in contact with the film for X-ray backscattering rejection. Herein we explore the use of the lead foil as an image intensifier. In these studies, spatial resolution was investigated when images were acquired on the dental X-ray films with and without the lead foil. Also, the lead foil was subjected to atomic analysis (fluorescent measurements) and structure analysis (X-ray diffraction). We determined that the use of the lead foil reduces the exposure time, however, does not affect the spatial resolution on the acquired images. This suggests that the fluorescent radiation spread is smaller than the grain sizes of the dental X-ray films. © 2014 Elsevier B.V.
Energy capacity of broiler litter used as a substrate for biogas production in the southwestern region of the state of Paraná, Brazil [Potencial energético da cama de aviário produzida na região Sudoeste do Paraná e utilizada como substrato para a produção de biogás]
Tessaro A.B.,Federal University of Pelotas |
Tessaro A.A.,Uniao de Ensino Do Sudoeste Do Parana UNISEP |
Cantao M.P.,Institute Tecnologia Para O Desenvolvimento |
Mendes M.A.,Faculdade Integrado de Campo Mourao
Revista em Agronegocio e Meio Ambiente | Year: 2015
The breeding of confined broilers produces wastes that cause environmental problems. They require different management procedures since they may generate great environmental impact and consequently disposal for the residues produced. Current paper assessed the energy capacity of broiler litter used as a substrate for the production of biogas in the southwestern region of the state of Paraná, Brazil. A qualitative, quantitative and exploratory research was undertaken for data in specific bibliographies on the subject and the characterization of poultry production in the region. Poultry biomass was characterized chemically and later evaluated in three treatments to determine the capacity for biogas production. Results showed that the southwestern region of the state of Paraná produces 39,173,367 broilers/year in 38 municipalities, with 51,219.17 tons of biomass in the form of broiler litter/year. The biomass, comprising nitrogen, phosphorus, potassium calcium, magnesium and sulfates, produces biogas in the three treatment systems under analysis, although the second treatment was the most viable. The biofertilizers, with pH between 6.58 and 8.02, proved to be rich in macro- and micro-nutrients, mainly nitrogen, phosphorus, potassium calcium, magnesium, sodium, iron, boron, copper, zinc and manganese. Biomass from broiler litter may be a viable alternative in the production of biogas which will be capable of replacing traditional fuel and electric energy in poultry-breeding farms in the region.
Alberti E.A.,Federal University of Paraná |
Alberti E.A.,Institute Tecnologia para o Desenvolvimento |
Bueno B.M.P.,Institute Tecnologia para o Desenvolvimento |
D'Oliveira A.S.C.M.,Federal University of Paraná
Soldagem e Inspecao | Year: 2015
Additive manufacturing (AM) is a process used to build and repair complex shape components or whenever a property gradient is required. In this manufacturing procedure, multiple layers are deposited to fabricate a component. The success of the procedure is strongly dependent on the deposition technique, processing parameters selection and chemical composition of the material being deposited. Also pre-heating and the use of inert atmosphere impact on cracking, wettability and oxidation of the deposited layers. In this study, the potential of plasma transferred arc for additive manufacturing was assessed by the fabrication of “thin walls”. Two Ni superalloys were used, a solid solution hardening and a gamma prime precipitation hardening alloy. The analysis of processing parameters that allowed to process “thin wall”, included pre-heating at 300°C. Results showed that the chemical composition and the using of pre-heating impact on the layers geometry. In both alloys, a fine dendritic solidification structure with epitaxial growth between layers was identified. However, each alloy determined the hardness profile along the cross section. The precipitation hardened alloy is strongly influenced by the deposition thermal cycle of each layer. The solid solution hardened alloy is mainly influenced by dilution of the first layers with the substrate. © 2015, Universidade Federal de Uberlandia. All rights reserved.
Souza-Bastos L.R.,Federal University of Paraná |
Bastos L.P.,Institute Tecnologia para o Desenvolvimento |
Freire C.A.,Federal University of Paraná
North American Journal of Aquaculture | Year: 2015
Abstract: Silver Catfish Rhamdia quelen, a native South American catfish relevant in intensive culture systems in Brazil, were exposed to three ammonia concentrations added to the water (0.5, 1.0, and 2.0 mg/L as ammonium chloride). After 5 and 24 h, measured water ammonia levels increased to maximum levels of 15.8–41.1 mg/L, reflecting the addition of ammonia excreted by the fish. Aquaria were aerated but kept closed, and pH and temperature were kept constant. Hematocrit, plasma ammonia, osmolality, Na+, Cl−, K+, glucose, and cortisol were assayed. Branchial and muscle hydration levels and branchial and renal specific activities of the carbonic anhydrase (CA) were determined. Silver Catfish did not show stress responses or signs of osmoregulatory disturbance upon the increased water ammonia levels. However, there was inhibition of the CA in gills and kidneys, especially after 24 h, in a dose-dependent manner to the total ammonia accumulated in the water. Although Silver Catfish are tolerant of increase in ammonia, care should be taken to limit increases in ammonia levels and time of exposure because the severity of the deleterious effects will certainly increase. In addition, results have shown that the fish carbonic anhydrase (branchial and renal) is a sensitive biomarker of effect of ammonia. Received June 17, 2014; accepted August 25, 2014. © 2015, © American Fisheries Society 2015.
Influence of plasma remelting on the microstructure of Fe-Mn-Cr-Si arc thermal spray coating deposited on ASTM A743-CA6NM stainless steel [Influência da refusão por plasma na microestrutura de um revestimento Fe-Mn-Cr-Si depositado por aspersão térmica arco elétrico sobre aço inoxidável ASTM A743-CA6NM]
Pukasicwicz A.G.M.,Federal Technological University of Paraná |
de Oliveira F.R.,Federal Technological University of Paraná |
Capra A.R.,Institute Tecnologia para o Desenvolvimento |
Paredes R.S.C.,Federal University of Paraná
Soldagem e Inspecao | Year: 2012
ASTM A743-CA6NM martensitic stainless steel have been used in hydraulic turbines manufacturing, but show some restrictions in welded recovered areas. Different techniques have been applied in order to reduce or eliminate residual stress, with life increase. The deposition of cavitation resistant coatings is another important way to increase the service life of these components. The objective of this study is evaluate the influence of type and intensity of plasma remelting current on the microstructure, chemical composition and microhardness of the Fe-Cr-Mn-Si cavitation resistant coatings deposited by arc thermal spray process on CA6NM steel. It was observed that lower level of current, as well as, the use of pulsed current reduce ferrite 8 layer and HAZ thickness, reducing base metal modifications during coating remelting. It was observed that base metal dilution alterations did not promote any significant modification on microstructure and microhardness of the remelted coatings. Constant arc remelting current promoted a microstructure alignment with plasma torch dislocation, this behavior was not observed in pulsed current remelted coatings.
Munhoz-Rojas P.E.,Institute Tecnologia Para O Desenvolvimento
Progress in Electromagnetics Research Symposium | Year: 2012
An axiomatic reformulation of Maxwell's theory of electromagnetism is presented that permits to deduce Maxwell's theory and, also, most of the well known theories of classical electromagnetism. As a result it is shown that these theories are not fully equivalent. It is shown that, independently of the existence or inexistence of free magnetic poles, Maxwell-Hertz's equations are valid microscopically. It is also shown that all interaction processes involve an "electric quantity" and a "magnetic quantity". Using these concepts, a theory of the interaction between fields and macroscopic matter is presented, which extends the well known Maxwell-Lorentz's theory. As a result, it is shown that Maxwell's theory of light propagation in a non-conducting medium concerns the interaction between bound magnetic charges and bound electric charges, which is a phenomenon totally different from the electromagnetic perturbations that are attached to metallic conductors, where the excitation is due to free electric charges moving inside the conductor. It is believed that these results, besides its academic interest, could be useful for the design and interpretation of the functioning principle of antennas and sensors.
Rossa Jr. J.,Federal University of Paraná |
Portella K.F.,Institute Tecnologia Para o Desenvolvimento
Ceramica | Year: 2012
In this study the use of high oven slag addition in tile adhesives, type AC-I, in place of Portland's cement parts of mass was investigated. The physical and chemical aspects (XRD, XRF, SEM and EDS) of three compositions of different parts from Brazil slag were studied, using the less reactivity slag. The results indicated the potentiality of use, with similar adherence strain stress to reference samples and higher than the standard recommendation.
Kanning R.C.,Federal University of Paraná |
Portella K.F.,Institute Tecnologia Para O Desenvolvimento |
Braganca M.O.G.P.,Institute Tecnologia Para O Desenvolvimento |
Bonato M.M.,Federal University of Paraná |
Dos Santos J.C.M.,Companhia de Eletricidade da Bahia
Construction and Building Materials | Year: 2014
The worldwide productions of banana were bigger than 95 million tons, which resemble to, approximately, 10.22 million tons of ashes. Additions of these residues or banana leaf ash (BLA) in mortars were investigated by ratios of 0-10% in replacement to weight of the Portland cement as pozzolanic materials. The products were characterized by chemical compositions, SEM, rheology and pozzolanic activity index. Hardened materials were characterized by tearing it in walls. The mechanical and chemical resistance performances of 10% and 20% BLA concrete samples were also evaluated by artificial ageing chambers. The BLA was considered a pozzolan material. © 2014 Elsevier Ltd. All rights reserved.
Development of Nb2O5|Cu composite as AISI 1020 steel thermal spray coating for protection against corrosion by soil in buried structures [Desenvolvimento e uso do compósito de Nb2O5|cu como revestimento aplicado por aspersão térmica sobre o aço aisi 1020 para proteção contra a corrosão pelo solo em estruturas enterradas]
Junior O.R.,Federal Technological University of Paraná |
Da Silva J.M.,Institute Tecnologia para o Desenvolvimento |
Portella K.F.,Institute Tecnologia para o Desenvolvimento |
Paredes R.S.C.,Federal University of Paraná
Quimica Nova | Year: 2012
An Nb2O|Cu corrosion-resistant coating was developed and applied onto AISI 1020 steel substrate by Powder Flame Spray. A galvanostatic electrochemical technique was employed, with and without ohmic drop, in four different soils (two corrosively aggressive and two less aggressive). Behavior of coatings in different soils was compared using a cathodic hydrogen reduction reaction (equilibrium potential, overvoltage and exchange current density) focusing on the effect of ohmic drop. Results allow recommendation of Nb2O5|Cu composite for use in buried structure protection.
Rosendo M.,Institute Tecnologia para o Desenvolvimento |
Rosendo M.,Federal University of Paraná |
Buriol T.,Federal University of Paraná |
De Geus K.,Federal University of Paraná |
And 3 more authors.
Proceedings - 2011 3rd International Conferenceon Games and Virtual Worlds for Serious Applications, VS-Games 2011 | Year: 2011
Some activities related to the maintenance of power distribution networks can be performed without interrupting the flow of energy on the line. This kind of activity, referred to as "live line maintenance", imposes risks which have to be taken into account, especially those which may affect human lives. Thus, the training process is crucial to the safety of electricians and to the success of maintenance operations. In order to address these issues, a virtual environment can be used as a mechanism for improving knowledge acquisition and retention, enhancing the quality of the learning process during training. This paper discusses the development of a serious game for training of live line maintenance activities. Aspects of the developed software, its characteristics and functional model, in addition to the interactive devices adopted and technical strategies are presented. The goal is to describe an unprecedented platform which uses devices such as the Nintendo Wii Remote and 3D TV sets to provide a novel model of interaction and navigation. These models are based on some principles of pervasive computing. © 2011 IEEE.