JOAO CRISTIANO ULRICH
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Artigo IPEN-doc 24760 Control chart on semi analytical weighting2018 - MIRANDA, G.S.; OLIVEIRA, C.C.; SILVA, T.B.S.C.; STELLATO, T.B.; MONTEIRO, L.R.; MARQUES, J.R.; FAUSTINO, M.G.; SOARES, S.M.V.; ULRICH, J.C.; PIRES, M.A.F.; COTRIM, M.E.B.Semi-analytical balance verification intends to assess the balance performance using graphs that illustrate measurement dispersion, trough time, and to demonstrate measurements were performed in a reliable manner. This study presents internal quality control of a semianalytical balance (GEHAKA BG400) using control charts. From 2013 to 2016, 2 weight standards were monitored before any balance operation. This work intended to evaluate if any significant difference or bias were presented on weighting procedure over time, to check the generated data reliability. This work also exemplifies how control intervals are established.Artigo IPEN-doc 24757 Is my bottom-up uncertainty estimation on metal measurement adequate?2018 - MARQUES, J.R.; FAUSTINO, M.G.; MONTEIRO, L.R.; ULRICH, J.C.; PIRES, M.A.F.; COTRIM, M.E.B.Is the estimated uncertainty under GUM recommendation associated with metal measurement adequately estimated? How to evaluate if the measurement uncertainty really covers all uncertainty that is associated with the analytical procedure? Considering that, many laboratories frequently underestimate or less frequently overestimate uncertainties on its results; this paper presents the evaluation of estimated uncertainties on two ICP-OES procedures of seven metal measurements according to GUM approach. Horwitz function and proficiency tests scaled standard uncertainties were used in this evaluation. Our data shows that most elements expanded uncertainties were from two to four times underestimated. Possible causes and corrections are discussed herein.Artigo IPEN-doc 24449 Is my bottom-up uncertainty estimulation on metal measurement adequate?2017 - MARQUES, JOYCE R.; FAUSTINO, MAINARA G.; MONTEIRO, LUCILENA R.; ULRICH, JOAO C.; PIRES, MARIA A.F.; COTRIM, MARYCEL E.B.Artigo IPEN-doc 24439 Control chart on semi analytical weighting2017 - MIRANDA, G.S.; OLIVEIRA, C.C.; SILVA, T.B.S.C.; STELLATO, T.B.; MONTEIRO, L.R.; MARQUES, J.R.; FAUSTINO, M.G.; SOARES, S.M.V.; ULRICH, J.C.; PIRES, M.A.F.; COTRIM, M.E.B.Semi-analytical balance verification intends to assess the balance performance using graphs that illustrate measurement dispersion trough time, to demonstrate measurements were performed in a reliable manner. This study presents internal quality control of a semi-analytical balance (GEHAKA BG400) using control charts. From 2013 to 2016, 2 weight standards were monitored before any balance operation. This work intended to evaluate if any significant difference or bias were presented on weighting procedure over time, to check the generated data reliability. This work also exemplifies how control intervals are established.