A5101449824- Magnetic and transport properties of perovskites and related materials
- Advancements in Solid Oxide Fuel Cells
- Electrochemical Analysis and Applications
- Electronic and Structural Properties of Oxides
- Advanced Condensed Matter Physics
- Gas Sensing Nanomaterials and Sensors
- Electrocatalysts for Energy Conversion
- Magnetic Properties and Synthesis of Ferrites
- Transition Metal Oxide Nanomaterials
- Multiferroics and related materials
- Metal Extraction and Bioleaching
- Analytical Chemistry and Sensors
- Electrical and Thermal Properties of Materials
- Physics of Superconductivity and Magnetism
- Chalcogenide Semiconductor Thin Films
- Catalysis and Oxidation Reactions
- Free Radicals and Antioxidants
- Chromatography in Natural Products
- Water resources management and optimization
- TiO2 Photocatalysis and Solar Cells
- Corrosion Behavior and Inhibition
- Ferroelectric and Piezoelectric Materials
- Iron oxide chemistry and applications
- Conservation Techniques and Studies
- Hydropower, Displacement, Environmental Impact
Universidade Federal do Pampa
2024
Universidade do Porto
2024
i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto
2024
University of Lisbon
2001-2021
Museu Nacional de História Natural e da Ciência
2021
Universidade Federal do Pará
2017-2021
Universidade do Estado do Rio de Janeiro
2021
Universidade Federal do Rio de Janeiro
2015-2019
Impact Technology Development (United States)
2018
Centre d’Etudes Politiques Et sociaLes
2018
Objective: To establish the role of psychosocial risk and protective factors in cross-sectional variation adolescent problem drinking, transition into drinking over time. Method: The data were from a four-wave (1989-1992) longitudinal study 1,591 adolescents large, urban school district. School district officials selected schools for with an aim toward maximizing representation minority students inner-city areas. At Wave 1, all Grades 7, 8, 9 asked to participate. Results: Both (such as low...
The structure of the interrelations among a variety health-enhancing behaviors was examined using structural equation modeling analyses questionnaire data from 1,280 middle school students and 2,219 high students. included seat belt use, adequate hours sleep, attention to healthy diet, exercise, low sedentary behavior, regular toothbrushing. In sample, all correlated significantly but modestly with each other, except for sleep three 15 correlations were significant. results further show that...
Objective: Research conducted in the 1970s demonstrated that Problem Behavior Theory could account for approximately 40% of variance problem drinking both local and national sample studies. The present analyses sought to determine whether personality, perceived environment, behavior variables framework continue contribute explanation among contemporary American youth. Method: Correlational multiple regression were performed on six separate databases collected at different times between 1972...
The band gap of the mixed perovskite BaSn1–xSbxO3 has been reported to be 134 kJ mol–1(J-M. Hermann, M. R. Nunes and F. A. da Costa, J. Chem. Soc., Faraday Trans. I, 1982, 78, 1983), corresponding 1.4 eV, which is optimum value for solar-energy conversion. In order confirm this value, pressed discs were sintered at 1673 K made into electrodes, their electrolyte electroreflectance (e.e.r.) spectra measured. was determined by fitting e.e.r. Aspnes' formula low-field regime. pure, insulating...
Abstract The use of inorganic species as assisting materials in matrix‐assisted laser desorption/ionization (MALDI) analysis is an alternative approach to avoid interfering matrix ions the low‐mass region mass spectra. Reports application matrices MALDI small molecules are, however, scarce. Nevertheless, titanium dioxide (TiO 2 ) powder has been reported be a promising medium. In this study we further explore TiO for low molecular weight compounds. We present results showing that nanosized...
Samples Lan+1NinO3n+1–δ(n=2,3) have been prepared by two different methods, which lead to oxygen stoichiometry values. Materials obtained the citrate route always show higher content of Ni3+ , can be rationalized high reactivity and original morphology precursors this method.
Some different oxygen content La4Ni3O10+δ (δ=0.02,0.12,−0.22) compounds were prepared in order to study the influence of Ni3+ on electronic properties. A metal–metal transition was detected at 140 K for as-prepared (La4Ni3O10.02) and reduced (La4Ni3O9.78) compounds. From electrical conductivity, Seebeck coefficient magnetic studies samples, stoichiometry found be a critical parameter defining existence less conductive low temperature state. The results are interpreted assuming charge nickel...
Achyrobichalcone is a biflavonoid recently found in Achyrocline satureioides. This substance has unprecedented chemical structure and occurrence, but resembles other bioactive bichalcones, which have important pharmacological properties, such as anticancer activity. The major challenge for evaluation of the physicochemical biological properties this new molecule isolation step, affects purity yield isolated product. Thus, objective work was to develop semi-preparative method achyrobichalcone...
Infection is one of the main causes orthopedic implants failure, with antibiotic-resistant bacteria playing a crucial role in this outcome. In work, antimicrobial nanogels were developed to be applied situ as implant coating prevent orthopedic-device-related infections. To that regard, broad-spectrum peptide, Dhvar5, was grafted onto chitosan via thiol–norbornene "photoclick" chemistry. Dhvar5-chitosan (Dhvar5-NG) then produced using microfluidic system. Dhvar5-NG (1010 (NG)/mL) Dhvar5...
In this study, the chemistry stability of hydroquinone (HQ) was evaluated according to its effects in redox properties and compared kojic acid (KA).The HQ oxidation more inhibited by N-acetylcysteine (NAC) than ascorbic (AA).These results were elucidated using theoretical methods at DFT/B3LYP level theory.All electronic parameters related between antioxidant performance highest occupied molecular orbital (HOMO), lowest unoccupied (LUMO), HOMO-LUMO value gap (GAP), ionization potential (IP),...
The benzidine photodegradation process was studied using UV/Vis spectroscopy and electrospray ionization mass spectrometry (ESI-MS) combined with collision-induced dissociation (CID) tandem (MS/MS). Mass used to characterize identify possible degradation products intermediates. MS data showed that is quite persistent in aqueous medium. Moreover, the analysis enabled us propose following three products/intermediates: 4'-nitro-4-biphenylamine, tetrahydroxybiphenyl 4,4'-dinitrobiphenyl. For...