P
Paulo Roberto de Oliveira
Researcher at Federal University of São Carlos
Publications - 154
Citations - 3179
Paulo Roberto de Oliveira is an academic researcher from Federal University of São Carlos. The author has contributed to research in topics: Detection limit & Convex function. The author has an hindex of 26, co-authored 144 publications receiving 2369 citations. Previous affiliations of Paulo Roberto de Oliveira include University of the Azores & State University of Campinas.
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Journal ArticleDOI
Proximal Point Algorithm On Riemannian Manifolds
TL;DR: In this article, the authors consider the minimization problem with constraints and show that the proximal point method in Euclidean space is naturally extended to solve that class of problems.
Journal ArticleDOI
Additive-manufactured (3D-printed) electrochemical sensors: A critical review.
Rafael M. Cardoso,Cristiane Kalinke,Raquel G. Rocha,Pãmyla L. dos Santos,Diego P. Rocha,Paulo Roberto de Oliveira,Bruno C. Janegitz,Juliano Alves Bonacin,Eduardo M. Richter,Rodrigo A.A. Munoz +9 more
TL;DR: The aim of this review is to present a guide for new users of3D-printing technology considering the required features for improved electrochemical sensing using 3D-printed sensors and devices already reported using selective laser melting and fused deposition modeling 2D-printers.
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Electrochemical determination of copper ions in spirit drinks using carbon paste electrode modified with biochar
Paulo Roberto de Oliveira,Alyne Lamy-Mendes,Edivaltrys Inayve Pissinati de Rezende,Antonio S. Mangrich,Luiz H. Marcolino,Márcio F. Bergamini +5 more
TL;DR: Determination of copper ions content in different samples of spirit drinks samples was also realized adopting inductively coupled plasma optical emission spectroscopy (ICP-OES) and the results achieved are in agreement at a 95% of confidence level.
Journal ArticleDOI
Subgradient algorithm on Riemannian manifolds
TL;DR: In this article, the influence of the sectional curvature of the manifold on the convergence of the subgradient method is discussed, as well as the proof of convergence if the curvature is nonnegative.
Journal ArticleDOI
The use of activated biochar for development of a sensitive electrochemical sensor for determination of methyl parathion
Paulo Roberto de Oliveira,Cristiane Kalinke,Jeferson L. Gogola,Antonio S. Mangrich,Antonio S. Mangrich,Luiz Humberto Marcolino Junior,Márcio F. Bergamini +6 more
TL;DR: In this article, a carbon paste electrode modified with biochar activated with nitric acid was used for spontaneous preconcentration of Methyl Parathion and for further quantitative determination in drinking water.