Este artigo tem por objetivo investigar como atividades de Modelagem Matemática, na perspectiva da Model-Eliciting Activities (MEAs), podem contribuir com o desenvolvimento do pensamento algébrico no 6º ano Ensino Fundamental. Para isso foi desenvolvida uma atividade Matemática nessa em turma ano, alunos 11 a 14 anos, um Colégio Estadual localizado Norte Paraná. A pesquisa realizada âmbito Mest...

19 20 The optical recording of light-evoked activity in populations of neurons in the 21 mammalian retina offers several benefits over the use of multi-electrode arrays. However, 22 population imaging has been hindered by the effective loading of synthetic fluorescent 23 indicators, especially in the mature tissue. We have therefore developed an 24 electroporation method to label the complete g...

Proton exchange membranes remain a crucial material and key challenge to fuel cell science technology. In this work, new Nafion are prepared by casting method using aryl- or azaheteroaromatic bisphosphonate compounds as dopants. The incorporation of the dopant, considered at 1 wt% loading after previous selection, produces enhanced proton conductivity properties in membranes, different temperat...

Soil aggregates are among crucial factors for determining both the quality and erosion resistance of soils. Biochar is a soil amendment that has seen increasing use to improve specific properties, mainly physical structure preserving capacity water nutrients, as well sequestration organic carbon. In this study, we applied rice husk biochar (RHB) cattle manure compost (COM) in sandy loam rural s...

High (or medium)-entropy alloys (H/MEAs) are complex concentrated solid solutions that may develop chemical short-range order (CSRO). In this regard, CrCoNi, the prototypical face-centered-cubic MEA, has recently kindled a debate in H/MEA community, as it is uncertain if CSRO can possibly form such multi-principal-element solution, where no equilibrium or metastable intermetallic compounds have...

Alvanite is monoclinic P2Jn, with a = 17.808(8), b = 5.132(3), c = 8.881(4)A, and/3 = 92.11(3) ~ The density is 2.49 g/cm 3 (meas), 2.492 g/cm ~ (calc), Microprobe analysis yielded A1203 34.2, FeO 0.3, ZnO 7.6, NiO 4.2, V205 27.5, H20 (by difference) 26.2, total = 100.0 wt. %. This leads to the idealized formula (Zn,Ni)A14(VO3)2(OH)j2.2H20 with Z = 2.

The experimental conditions required for the precise determination of polarographic half-wave potentials have been investigated and are discussed. The values of half-wave potentials vary with the characteristics of the dropping-m ercury electrode in the case of reduction of m etal ions to metal soluble in mercury. Consequently, it is necessary to specify the experimental condition whenever valu...

Dealloyed Pt core-shell nanoparticles constitute the most active and stable bimetallic oxygen reduction catalysts for low-temperature fuel cells. Here, we review recent advances on their preparation, structural characterization, and electrocatalytic performance. Starting with bimetallic metal overlayer model systems, for which we illustrate fundamental principles of the ORR activity enhancement...