BR – Page 8 – TechConnect Briefs

Nanopowders of TiO2 obtained by combustion reaction: effect of fuels

Almeida E.P., Coutinho J.P., Freitas N.L., Kiminami R.H.G.A., Costa A.C.F.M., Lira H.L., Universidade Federal de Campina Grande, BR

The synthesis by combustion reaction to obtain TiO2 has been studied by several researchers and using different fuels. Thus, this study aimed to evaluate the effect of fuel (citric acid monohydrate, aniline, oxalic dihidrazida and [...]

Preparation of ZnAl2O4 Catalytic Support by Combustion Reaction: Influence of Type of Heating Source

Leal E., Viana K.M.S., Kiminami R.H.G.A., Meneghetti S.M.P., Costa A.C.F.M., Lira H.L., Universidade Federal de Campina Grande, BR

The aim of this work is to evaluate the esterification activity of ZnAl2O4 catalysts obtained by different ways of heating (IU-plate, IIU-muffle furnace and IIIU-microwave oven) during the combustion synthesis using urea as reducing agent, [...]

Technical and Economical Analysis of Photovoltaic Pumping Systems with V Type Concentrators in Irrigation System to Productive Chains

Bione J.M., Fraidenraich N., Vilela O.C., Universidade de Pernambuco - Escola Politécnica, BR

This paper presents the dimensioning of a photovoltaic pumping system with concentrator type V (SBFV) for irrigation of a culture in the semi-arid area of the Northeast of Brazil. The elaboration, an analysis of the [...]

Growth, Optical Characterization and Modelling of ZnO Nanorods on Si, SiC and Macroporous Si Structure

Ferreira da Silva A., Castro Meira M.V., Persson C., Gutman N., Sa’ar A., Klason P., Willander M., Universidade Federal da Bahia, BR

1- Instituto de Física, Universidade Federal da Bahia, Ondina, Salvador-Ba, 40210-340, Brazil 2- CETEC-Universidade Federal do Recôncavo da Bahia, Cruz das Almas-Ba, 44380-000, Brazil 3- Department of Materials Science and Engineering, Royal Institute of Technology, [...]

Technical and Economical Analysis of Photovoltaic Pumping Systems with V Type Concentrators in Irrigation System to Productive Chains

Bione J.M., Fraidenraich N., Vilela O.C., Universidade de Pernambuco - Escola Politécnica, BR

This paper presents the dimensioning of a photovoltaic pumping system with concentrator type V (SBFV) for irrigation of a culture in the semi-arid area of the Northeast of Brazil. The elaboration, an analysis of the [...]

Growth, Electrical and Optical Properties of SnO2:F on ZnO , Si and Porous Si Structure

Ferreira da Silva A., Castro Meira M.V., Persson C., Gutman N., Sa’ar A., Klason P., Willander M., Canestraro C.D., Moreno T.V., Roman L.S., Universidade Federal da Bahia, BR

1- Instituto de Física, Universidade Federal da Bahia, Ondina, Salvador-Ba,40210-340, Brazil 2- CETEC-Universidade Federal do Recôncavo da Bahia, Cruz das Almas-Ba, 44380-000, Brazil 3- Department of Materials Science and Engineering, Royal Institute of Technology,SE-100 44 [...]

Study of model contaminants desorption from recycled PET in dry air and nitrogen atmosphere by thermogravimetric analysis

Santos A.S.F., Agnelli J.A.M., Medeiros E.S., Corradini E., Manrich S., Institute for Technological Research, BR

The polyethylene terephthalate (PET) bottle-to-bottle recycling is a good example of a successful technology that has allowed an increase of recycled plastic market. Nevertheless, the capability of all these processes to decontaminate recycled plastics into [...]

Study of model contaminants desorption from recycled PET in dry air and nitrogen atmosphere by thermogravimetric analysis

Santos A.S.F., Agnelli J.A.M., Medeiros E.S., Corradini E., Manrich S., Institute for Technological Research, BR

The polyethylene terephthalate (PET) bottle-to-bottle recycling is a good example of a successful technology that has allowed an increase of recycled plastic market. Nevertheless, the capability of all these processes to decontaminate recycled plastics into [...]

Slurry sample injection for determination of ferrite nanocolloids chemical composition by ICP spectrometry

Sousa M.H., Lins E.S., Tourinho F.A., Depeyrot J., Martins W.D., Zara L.F., Castro C.F.S., de Castro G.R., Universidade de Brasilia, BR

In the biomedical field, some applications of nanomaterials require dynamically quantifying them in blood and tissues probes. Nevertheless, the usual methods which are employed to titrate the nanoparticles require their dissolution before the chemical analysis, [...]

A Setup for Automatic MOSFET Mismatch Characterization under a Wide Bias Range

Klimach H., Galup-Montoro C., Schneider M.C., Federal University of Santa Catarina, BR

Mismatch is the denomination of time-independent variations between identically designed components. In analog circuits, the spread in the dc characteristics of supposedly matched transistors results in inaccurate or even anomalous circuit behavior. Also, for digital [...]