229 research outputs found

    Focal Spot, Winter 1983/84

    Get PDF
    https://digitalcommons.wustl.edu/focal_spot_archives/1036/thumbnail.jp

    Qualidade da interação professor-aluno no 1.º ciclo do ensino básico: do diálogo experiencial à educação emocional.

    Get PDF
    Na interação professor-aluno, a qualidade do diálogo estabelecido pode potenciar a escuta, a partilha, o reconhecimento e a compreensão de emoções, dimensões conducentes a uma melhoria do processo de ensino-aprendizagem em contexto de sala de aula e consequentemente ao desenvolvimento de um trabalho ao nível da educação emocional das crianças. A interação professor-aluno que crie as condições necessárias para uma educação emocional com sucesso é o foco do nosso projeto. O diálogo experiencial/sensibilidade é a dimensão em estudo e compreende os indicativos de autenticidade, aceitação e empatia. Com o presente estudo, financiado pela Fundação para a Ciência e Tecnologia (FCT) e apoiado pelo Centro de Investigação Didática e Tecnologia na Formação de professores pretende-se trazer uma contribuição para a promoção do bem-estar emocional de crianças e professores em sala de aula. Assim esta investigação, sendo um estudo exploratório e descritivo, insere-se numa metodologia qualitativa e no paradigma fenomenológico-interpretativo. Este estudo pretende conhecer a perceção de uma amostra de professores portugueses sobre as interações professor-aluno que possibilitam uma educação emocional com sucesso, e compreender e analisar as estratégias de promoção da educação emocional em contexto escolar. O estudo decorre em duas fases. Na fase I, a foram aplicados inquéritos por questionário a 91 professores de 5 agrupamentos de escolas do 1.º ciclo do ensino básico da zona centro do país. Na fase II, e com base nos resultados da fase I do estudo, será retirada uma amostra mais pequena de 8 docentes para realização de entrevistas focus group e narrativas de situação. A análise preliminar dos dados demonstra uma prevalência de docentes interessados em desenvolver atividades de educação emocional em sala de aula mas uma percentagem reduzida a fazê-lo. Pretende-se com este trabalho contribuir para a promoção do bem-estar emocional de crianças e professores em sala de aula.info:eu-repo/semantics/publishedVersio

    Manganese-Catalyzed <i>ortho</i>-C‑H Amidation of Weakly Coordinating Aromatic Ketones

    No full text
    An efficient manganese-catalyzed <i>ortho</i>-C-H amidation of weakly coordinating aromatic ketones using the readily available sulfonyl azide as the amination reagent is developed. The key step is the ketone directed aromatic metalation using the in situ generated reactive Mn intermediate, MnMe­(CO)<sub>5</sub>. This method offers excellent chemical yields, high regioselectivities, and good functional group tolerance

    Rapid Chemical Reaction Workup Based on a Rigid Solvent Extraction

    No full text
    The conventional chemical reaction workup based on liquid–liquid extraction is a time- and labor-consuming practice. We have developed a substantially faster technique for the routine workup that relies on a porous organic polymer (Porelite) supported solvent phase to extract organic products from an aqueous reaction mixture. We call this process rigid solvent extraction. Using this technique, the tedious liquid–liquid extraction can be replaced by a simple filtration, making parallel operation and automation feasible

    Cationic Gold Catalyst Poisoning and Reactivation

    No full text
    High gold affinity impurities (halides, bases) in solvents, starting materials, filtration, or drying agents could affect the reactivity of gold catalyst adversely, which may significantly reduce the TON of cationic gold-catalyzed reactions. Use of a suitable acid activator (e.g., HOTf, In­(OTf)<sub>3</sub>) reactivates the gold catalyst and makes the reaction proceed smoothly at low gold catalyst loading

    Ligand Effects and Ligand Design in Homogeneous Gold(I) Catalysis

    No full text
    Gold catalysis is considered one of the most important breakthroughs in organic synthesis during the past decade, but a rational understanding of ligand effects in gold catalysis is lacking. Most gold-catalyzed reactions go through three major stages: (i) electronic activation of alkyne (or allene) to generate a vinyl gold intermediate; (ii) protodeauration to generate the product and regenerate the cationic gold catalyst; (iii) decay of the active gold catalyst. Our research provides a clearer understanding of how ligands influence each of the three stages in the gold catalytic cycle. What is even more important, by not focusing on a particular gold-catalyzed reaction, we have been able to categorize most gold-catalyzed reactions and propose a ligand design protocol for each category of gold-catalyzed reactions

    Faster and Greener Chemical Reaction Workup Using Silicone Elastomer-Coated Glass Powders

    No full text
    We have developed a substantially faster and greener technique for routine chemical reaction workups. We use silicone elastomer-coated glass powder (“FastWoRX”) as an absorbent to extract organic products from a quenched aqueous reaction mixture. After filtration, FastWoRX powder loaded with organic products can serve as a convenient input for flash chromatographic separations. With this technique, tedious and solvent-consuming liquid–liquid extractions are replaced by a simple filtration. Use of FastWoRX reduces solvent use and the <i>E</i>-factor by up to an order of magnitude compared to traditional liquid–liquid extraction-based workup

    The evolution of cooperation in Facebook dataset 1 with denoting only two pairs of best friends (four cooperators) as cooperators initially.

    No full text
    <p>The size of each node is related to its degree. Red nodes represent cooperators and black nodes represent defectors. We set , and . The game is repeated for 10000 times. The fraction of cooperators becomes 1 after 2000 time steps.</p

    Photoreaction Study of Methanol Adsorption Complexes on VO<sub>2</sub>(V<sub>2</sub>O<sub>5</sub>)<sub><i>n</i></sub><sup>+</sup> (<i>n</i> = 1–3) Clusters at 355 nm

    No full text
    VO<sub>2</sub>(V<sub>2</sub>O<sub>5</sub>)<sub><i>n</i></sub>CH<sub>3</sub>OH<sup>+</sup> (<i>n</i> = 1–3) complexes are generated from the interactions of pregenerated VO<sub>2</sub>(V<sub>2</sub>O<sub>5</sub>)<sub><i>n</i></sub><sup>+</sup> clusters with CH<sub>3</sub>OH in a fast flow reactor. The photoreactions of these three adsorption complexes at 355 nm are characterized by a high-resolution tandem time-of-flight mass spectrometer. The major photoproducts of V<sub>3</sub>O<sub>7</sub>CH<sub>3</sub>OH<sup>+</sup> are CH<sub>2</sub>O and V<sub>3</sub>O<sub>7</sub>H<sub>2</sub><sup>+</sup>, whereas those of V<sub>5</sub>O<sub>12</sub>CH<sub>3</sub>OH<sup>+</sup> and V<sub>7</sub>O<sub>17</sub>CH<sub>3</sub>OH<sup>+</sup> are CH<sub>3</sub>OH and the corresponding V<sub><i>x</i></sub>O<sub><i>y</i></sub><sup>+</sup> (<i>x</i>,<i> y</i> = 5,12 and 7,17). Collision-induced dissociation and density functional theory/RRKM calculations suggest that CH<sub>3</sub>OH is dissociatively adsorbed on V<sub>3</sub>O<sub>7</sub><sup>+</sup>, whereas it is nondissociatively adsorbed on V<sub>5</sub>O<sub>12</sub><sup>+</sup> and V<sub>7</sub>O<sub>17</sub><sup>+</sup>. This study suggests that the thermal dissociation of CH<sub>3</sub>OH to CH<sub>3</sub>O is the prerequisite for its photo-oxidation into CH<sub>2</sub>O, which may shed light on the photochemistry of methanol over transition metal oxide surfaces

    Preparation of Fluorinated Tetrahydropyrans and Piperidines using a New Nucleophilic Fluorination Reagent DMPU/HF

    No full text
    DMPU/HF (HF content 65 wt %/wt) is an ideal nucleophilic fluorination reagent for the diastereoselective synthesis of substituted 4-fluorotetrahydropyrans and 4-fluoropiperidines via a fluoro-Prins reaction. When compared to classical nucleophilic fluorination reagents like pyridine/HF, DMPU/HF gives both higher yields and better diastereoselectivity
    • …
    corecore