Search results for "SAND"
showing 10 items of 2366 documents
Ferro- and Antiferromagnetic Interactions in Oxalato-Centered Inverse Hexanuclear and Chain Copper(II) Complexes with Pyrazole Derivatives.
2021
Two novel copper(II) complexes of formulas {[Cu(4-Hmpz)4][Cu(4-Hmpz)2(µ3-ox-κ2O1,O2:κO2′:κO1′)(ClO4)2]}n (1) and {[Cu(3,4,5-Htmpz)4]2[Cu(3,4,5-Htmpz)2(µ3-ox-κ2O1,O2:κO2′:κO1′)(H2O)(ClO4)]2[Cu2(3,4,5-Htmpz)4(µ-ox-κ2O1,O2:κ2O2′,O1′)]}(ClO4)4·6H2O (2) have been obtained by using 4-methyl-1H-pyrazole (4-Hmpz) and 3,4,5-trimethyl-1H-pyrazole (3,4,5-Htmpz) as terminal ligands and oxalate (ox) as the polyatomic inverse coordination center. The crystal structure of 1 consists of perchlorate counteranions and cationic copper(II) chains with alternating bis(pyrazole)(µ3-κ2O1,O2:κO2′:κO1′-oxalato)copper(II) and tetrakis(pyrazole)copper(II) fragments. The crystal structure of 2 is made up of perchlorat…
Promoting the Cultural Understanding of a Student in a General Education School: Teachers’ Experiences and Challenges
2020
Cultural understanding is a basis for competence-oriented general education. Teachers are responsible for applied content and methods that are used to purposefully lead school students to that result.The aim of this study is to identify actual goals for the development of teacher education curriculum, professional development, and teaching aids by investigating in-service teachers’ challenges in the successful promotion of students’ cultural understanding in general schools.The readiness of teachers to promote the cultural understanding of primary school students was explored in a mixed-methods study. The findings indicated aspects that teachers consider relevant as well as the main problem…
An empirical study of the understanding of formal propositions about sequences, with a focus on infinite limits
2018
International audience; In this paper, we analyze the answers of one group of high-school students and two groups of first-year University students to a questionnaire designed to test their level of recognition and understanding of the formal definition of the concept of infinite limit. Although this empirical study is ancillary to a larger project centred on didactic engineering, its analysis sheds light on the key issue of the logical prerequisites for the learning of the fundamental concepts of analysis. It also provides a new tool to investigate students' concept-image of limits, and assess the impact of teaching contexts and teaching paths.
Revista iberoamericana de educación
2013
espanolEsta experiencia se plantea desde la perspectiva de una ensenanza democratica, en un ambiente de autonomia, libertad y ayuda mutua que facilita el intercambio de saberes y la construccion del conocimiento del alumnado de educacion infantil. Tomamos como referente el trabajo por Proyectos, que se fundamenta en el analisis e interpretacion de la informacion, y en promover una perspectiva basada en la comprension, en la construccion de significados y en la concepcion de un curriculum transdisciplinar. Es necesario abrir las escuelas a su entorno logrando que se diversifiquen las situaciones y ambientes de aprendizaje. La decision sobre una ensenanza basada en competencias plantea no sol…
Latvijas ģimenes paaudzēs, 2018
2019
Pētījums aptver visas vecuma grupas: gan jaunus cilvēkus patstāvīgās dzīves sākumā (no 18 gadu vecuma), gan pieredzes bagātus — citās vecuma grupās (līdz 79 gadu vecumam), sniedzot precīzu informāciju par cilvēka dzīves galvenajiem demogrāfiskajiem notikumiem un cikliem vairāku paaudžu dzīvē, sākot jau no 1950. gadu vidus. Aptaujā tiek iegūta informācija par šādām tēmām: pāreja uz pieaugušo dzīvi (mācības un darbs, vecāku mājas atstāšana, pirmās partnerattiecības, jaunas ģimenes veidošana, labklājība un trūkums; kopdzīve un ģimenes stabilitāte (daudzveidīgās ģimenes formas, balanss starp darbu un ģimeni, pienākumu sadale starp vīriešiem un sievietēm,…
Training needs of teachers in ICT: Training profiles and elements of complexity
2011
Training needs of teachers in Information and Communication Technologies (ICT) is one of the key aspects for the integration of ICT in daily educational practice, along with competences in ICT and the use of these technological resources by teachers. The aim of this paper is to establish teacher training profiles and relate them to their competences in ICT and the use thereof, together with personal and contextual factors. To this end, it has been used a survey design, with the sample 868 teachers from primary and secondary education in the Comunidad Valenciana. The instrument for collecting information is a questionnaire. The results indicate that teachers demand higher-level training in p…
Non-standard Problems in an Ordinary Differential Equations Course
2018
International audience; We report first results from a teaching intervention in an ordinary differential equations (ODEs) course for engineering students. Our aim is to challenge traditional approaches to teaching of Existence and Uniqueness Theorems (EUTs) through the design of problems that students cannot solve by applying well-rehearsed techniques or familiar methods. We analyse how the use of nonstandard problems contributes to the development of students' conceptual understanding of EUTs and ODEs.
Designing for language learning: agency and languaging in hybrid environments
2014
Since the beginning of the 21st Century, we have witnessed a remarkable shift in the ways learning takes place across networks, multiple sites and timescales. As the world changes, language teaching is facing growing pressures to rethink and redesign language learning environments to respond to the demands of the ‘knowledge society’. While new digitally enhanced learning spaces offer new affordances to language teachers and learners, they also increase the complexity of language teaching and learning. Furthermore, it has become evident that the affordances of new tools and spaces for learning are not always realised in formal education. Language teachers, who are willing to embrace new tech…
Teachers' procedures when introducing algebraic expression in two Norwegian grade 8 classrooms
2015
International audience; We investigate similarities and differences in two teachers’ way of introducing algebraic expressions by designed examples. One teacher moves from the specific to the general, and the other moves from the general to the specific. They both mediate the passage from the students’ real world and the school mathematics they know, to algebra.
Measurement of the spin-dependent structure function g1(x) of the deuteron
1993
We report on the first measurement of the spin-dependent structure function g1d of the deuteron in the deep inelastic scattering of polarised muons off polarised deuterons, in the kinematical range 0.006<x<0.6, 1 GeV2<Q2<30 GeV2. The first moment, Γ1d=sh{phonetic}01 g1d dx=0.023±0.020 (stat.) ± 0.015 (syst.), is smaller than the prediction of the Ellis-Jaffe sum rules. Using earlier measurements of g1p, we infer the first moment of the spin-dependent neutron structure function g1n. The difference Γ1p-Γ1n=0.20 ±0.05 (stat.) ± 0.04 (syst.) agrees with the prediction of the Bjorken sum rule, Γ1p-Γ1n=0.191 ±0.002.