Results 241 to 250 of about 784,658 (306)

Precipitation of niobic acid from potassium niobate in sulphuric acid solution: A route to niobium oxide

open access: yesThe Canadian Journal of Chemical Engineering, EarlyView.
Graphical abstract illustrating the niobic acid precipitation process applied and the product obtained. Abstract This study investigates the precipitation of niobic acid (Nb2O5.nH2O) from potassium niobate solution with addition of sulphuric acid, and its subsequent thermal conversion into niobium oxide (Nb2O5). Thermodynamic modelling with PHREEQC and
Cássia R. Souza   +4 more
wiley   +1 more source

Can ISO/IEC 17025 serve as a tool to prevent scientific fraud in chemical research laboratories?

open access: yesThe Canadian Journal of Chemical Engineering, EarlyView.
Abstract Scientific fraud has been documented across multiple disciplines, and chemistry is no exception. Recent studies indicate that contamination of materials, methodological errors, and unreliable data, results, or analyses account for over 25% of retracted publications.
Flor Monica Gutierrez‐Alcantara
wiley   +1 more source

The COVID-19 Pandemic as a Lesson: WHO Actions Versus the Expectations of Medical Staff-Evidence from Poland. [PDF]

open access: yesJ Clin Med
Lewicki S   +7 more
europepmc   +1 more source

An international, multicentre, interventional, randomised, assessor-blinded trial to MAXimise the METHotrexate therapy potential in patients with active rheumatoid arthritis (MethMax trial): study protocol for a randomised controlled trial. [PDF]

open access: yesTrials
Anderle K   +19 more
europepmc   +1 more source

Prevalence of Plasmodium falciparum histidine rich protein 2/3 gene deletions affecting rapid diagnostic test performance in travellers. [PDF]

open access: yesJ Travel Med
Detzlhofer O   +7 more
europepmc   +1 more source

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