Search results for " base"
showing 10 items of 1811 documents
Étude sur les réformes curriculaires par l'approche par compétences en Afrique
2009
Cette étude vise trois objectifs : réaliser un état des lieux des processus de réformes curriculaires en éducation de base en Afrique pour identifier les problèmes rencontrés, les résultats positifs et les "bonnes pratiques", aider les responsables des systèmes éducatifs à prendre des mesures pertinentes et accompagner les réformes et enfin aider les bailleurs de fonds à mieux comprendre les effets de leur aide et à mieux cibler les projets de réforme en termes de coût et d'efficacité à tous les niveaux des systèmes éducatifs impliqués.
Evaluación de las actividades realizadas mediante la metodología de Aprendizaje Basado en Problemas
2020
[ES] La metodología de Aprendizaje Basado en Problemas (ABP) requiere un enfoque de evaluación en el que se evalúen una serie de competencias específicas y transversales. Esta evaluación debe de tener un carácter formativo que permita a los estudiantes identificar y corregir los errores a tiempo. Por lo tanto, es necesario disponer de herramientas para poder evaluar apropiadamente los resultados de aprendizaje y las competencias establecidas. En la asignatura de Corrosión de segundo de Máster de Ingeniería Química, el ABP se ha evaluado a través de un informe a entregar tras cada sesión de ABP, en donde se recogen las principales conclusiones tras la resolución cooperativa del problema plan…
Proyectos educativos multidisciplinares y ayuda a la comunidad
2019
This paper relates an experience carried out at a higher education setting, specifically involving 3rd-year students in the Early Childhood Education degree programme. In relation to this, the paper presents an educational model that takes into account the need to develop ethical and social competences and gives importance to interdisciplinary education in real contexts. To this aim, all the academic modules that form part of this degree programme devote 25% of their teaching time and evaluation to the development of an interdisciplinary project. This paper will describe one of these projects, entitled "Solve a real problem", the design of which is informed by service-learning and problem-b…
Oxidative transformation of aryls using molybdenum pentachloride.
2012
Molybdenum pentachloride combines a strong Lewis acid character with an unusually high oxidation potential creating a powerful reagent for oxidative transformations. Since the oxidative coupling reaction of aryls is induced at an extraordinarily high reaction rate, a variety of labile groups, e.g. iodo, tert-alkyl, etc., are tolerated on the aromatic core. Furthermore, the co-formed molybdenum salts can either be exploited for template effects to obtain uncommon geometries in a preferred manner, or redox-play starts after aqueous workup. Therefore MoCl(5) represents a unique and easily available reagent.
DFT computational study on Fe(III)-N,N′-ethylene-bis(salicylideneiminato) derivatives
2005
DFT calculations, at unrestricted B3LYP level, have been performed on the structures of three iron(III) complexes, Fe(Salen)Cl, [Fe(Salen)]+ and [Fe(Salen)OH2]+, where Salen is the anion of Schiff base ligand N,N′-ethylene-bis (salicylideneimine), considering the spin multiplicity (S) values 2, 4 and 6. The results obtained have been compared with the available structural an magnetic experimental data, allowing us to conclude that a stable form of the FeIII(Salen) complex in aqueous solution should be characterized by an energy stabilization of the S=4 compared to the S=6 state.
Electrochemistry, spectroelectrochemistry, chloride binding, and O2 catalytic reactions of free-base porphyrin-cobalt corrole dyads.
2005
Three face-to-face linked porphyrin-corrole dyads were investigated as to their electrochemistry, spectroelectrochemistry, and chloride-binding properties in dichloromethane or benzonitrile. The same three compounds were also investigated as to their ability to catalyze the electroreduction of dioxygen in aqueous 1 M HClO4 or HCl when adsorbed on a graphite electrode. The characterized compounds are represented as (PCY)H2Co, where P = a porphyrin dianion; C = a corrole trianion; and Y = a biphenylenyl, 9,9-dimethylxanthenyl, or anthracenyl spacer, which links the two macrocycles in a face-to-face arrangement. An axial binding of one or two Cl- ligands to the cobalt center of the corrole is …
Arborescent Supply Chains: the effect of OUT policies
2013
The objective of this paper is to analyze the impact of the smoothing replenishment rules on a divergent supply chain. To this purpose we simulate a classical four echelon serially- linked supply chain model and an arborescent supply chain model under two scenarios, i.e. classical OUT and smoothing replenishment rule. We show that the divergent supply chain structure always performs worse than the serial supply chain and how smoothing the order pattern may decrease this discrepancy.
Architectural Perspectives in the Cathedral of Palermo: Image-Based Modelling for Cultural Heritage Understanding and Enhancement
2015
Palermo off ers a repertoire of both artistic and architectural solid perspective of great beauty and in large quantity. This paper addresses the problem of the 3D survey of these works and their related study through the use of image-based modelling (IBM) techniques. We propose, as case studies, the use of IBM techniques inside the Cathedral of Palermo. Indeed, the church houses a huge and rich sculptural repertoire, dating back to 16th century, which constitutes a valid field of IBM techniques application. The aim of this study is to demonstrate the e ffectiveness and potentiality of these techniques for geometric analysis of sculptured works. Indeed, usually the survey of these artworks …
Computer‐based and Face‐to‐face Collaborative Argumentation in Secondary Schools in England and Finland
2005
Abstract This article focuses on the analysis of secondary school students’ argumentative interactions in England and Finland, within specific face‐to‐face and computer‐based environments. We propose that a combination of learning environments, in conjunction with teacher input and support, is important for developing argumentation skills in the classroom. Face‐to‐face argumentation, in particular, offers ample opportunity for concentrating on the quality (through deeper exploration) of arguments; such learning can enhance the construction of well‐structured arguments often associated with some computer‐based environments, such as synchronous computer chat.
Mononuclear and tetranuclear Fe(III) complexes with two different types of N, O donor Schiff base ligands
2013
Abstract A mononuclear Fe(III) complex of a tetradentate N 2 O 2 donor Schiff base ligand derived from 3-ethoxysalicaldehyde and ethylenediamine has been reported. In addition two tetranuclear Fe(III) complexes with discrete Fe 4 III (μ 4 -O) cores have been synthesized and characterized using two Schiff base ligands (H 2 L 1–2 ) derived from two different aromatic acid hydrazides and diacetyl monoxime. The mononuclear Fe(III) and one of the tetranuclear Fe(III) complexes have been structurally characterized by single-crystal X-ray crystallography. The mononuclear complex has a highly distorted octahedral geometry. The tetranuclear Fe(III) complexes are found to be rare examples with discre…