Search results for "SAND"
showing 10 items of 2366 documents
Combined proton NMR wideline and NMR relaxometry to study SOM-water interactions of cation-treated soils
2013
Abstract Focusing on the idea that multivalent cations affect SOM matrix and surface, we treated peat and soil samples by solutions of NaCl, CaCl2 or AlCl3. Water binding was characterized with low field 1H-NMR-relaxometry (20 MHz) and 1H wideline NMR spectroscopy (400 MHz) and compared to contact angles. From 1H wideline, we distinguished mobile water and water involved in water molecule bridges (WaMB). Large part of cation bridges (CaB) between SOM functional groups are associated with WaMB. Unexpectedly, 1H NMRrelaxometry relaxation rates suggest that cross-linking in the Al-containing peat is not stronger than that by Ca. The relation between percentage of mobile water and WaMB water in…
An activity theory perspective on contradictions in flipped mathematics classrooms at the university level
2019
Author´s accepted manuscript (postprint). This is an Accepted Manuscript of an article published by Taylor & Francis in International Journal of Mathematical Education in Science and Technology on 24/03/2019, available online: http://www.tandfonline.com/10.1080/0020739X.2019.1591533.
New TEL Environments for Vocational Education – Teacher’s Instructional Perspective
2015
Modern vocational education is increasingly taking place in new technology-enhanced learning (TEL) settings. On the one hand, vocational education can benefit from the opportunities of technological development. On the other hand, such technologies may create new challenges for teachers. Therefore, there is a particular need to pay more attention to the dialogic pedagogical approaches in which teaching should be seen as a dialogical practice involving teacher-student interactions that create contextual opportunities for teachers to trigger students’ learning in new TEL settings. This article reports on an exploratory study about the different ways in which teachers’ instructional activities…
Design and Style of Cultural and Media Studies Textbooks for College Students
2014
This paper uses the conceptual framework of multimodal discourse analysis in order to investigate the dominant styles and designs in selected Cultural and Media Studies (CMS) university textbooks. For many EFL students who major in philology, CMS courses are obligatory and thus constitute a type of content and language integrated learning (CLIL). The data from a description and evaluation of four popular textbooks indicate that there is a discernible move away from traditional literacy towards visuality and orality in textbook design and style. This tendency is evident in the use of segmentation and listing in composition, dialogic layouts and informal registers in exposition and visual aid…
Dialogical patterns of interaction in pre-school classrooms
2012
Abstract The present study set out to identify and examine dialogic educational interactions in Finnish pre-school classrooms. Video recordings of five observed pre-school classrooms that had shown a high or moderate quality of instructional support in literacy, maths and science studies were transcribed for micro-scale qualitative content analysis. Three patterns of teacher–child interaction emerged: first, a pattern characterised by the teacher making it possible for the children to demonstrate their knowledge and competence; second, a pattern characterised by the teacher supporting the children's participation and diverse contributions; and third, a pattern characterised by the teacher a…
Diastereoselective Synthesis of Dialkylated Bis(phosphino)ferrocenes: Their Use in Promoting Silver-Mediated Nucleophilic Fluorination of Chloroquino…
2017
International audience; The diastereoselective synthesis of dialkylated ferrocenyl bis(phosphane)s bearing aryl, alkyl, and hetero- or polycyclic substituents on the phosphino groups is reported, together with their characterization in the solid state by X-ray structure analysis and in solution by multinuclear NMR spectroscopy. Introduction of various alkyl groups on the ferrocene backbone, namely, tert-butyl, isopropyl, and trimethylsilyl, has a significant influence on the stereoselectivity of the ensuing lithiation/phosphination reactions. Only the introduction of the tert-butyl groups ensures both a high yield and perfect diastereoselectivity, which leads to the exclusive formation of t…
Brief an Garlieb H. Merkel
1798
Ms. 930a, Nr. 12, Bl. 31r-34v Johannes Daniel Falk. Brief an Garlieb H. Merkel, Weimar, den 3. December 179[8?] Autora rokraksts / Autograph, vācu val. / Deutsch [8] lpp. / S. Attēlu numuri / Bildnummern: 930a-012-1, 930a-012-2-3, 930a-012-4-5, 930a-012-6-7, 930a-012-8 Im vorliegenden Brief vermischen sich private und berufliche Angelegenheiten sowie Klatsch miteinander. Nachdem Falk seine lange Antwortzeit zunächst damit begründet, dass er Merkels aktuelle Adresse nicht kenne, bringt er Neuigkeiten von der Krankheit einer nicht näher benannten Kammerrätin und nimmt an deren Leiden rege Anteil. Direkt im Anschluss präsentiert Falk den Stand seiner Verhandlungen mit Verlegern. Auch wenn Falk…
Digital competences and teaching of classical languages
2018
Digital competence belongs to the competences that were recommended by the European Parliament in 2006 as a part of the students' training in citizenship. However, it is perceived that students of classical languages could face bigger disadvantage just because of the type of studies they chose to undertake. For this reason, we ask ourselves what is the perception of students of classical disciplines regarding the use of new technologies in classrooms and what competences they consider to be developed within these studies. Using a participatory approach/vision of the world and using a qualitative case study methodology, we collect data through semi-structured interviews with Italian and Span…
El relato digital como herramiento pedagógica en la enseñanza de lenguas extranjeras a través del uso de la secuencia didáctica
2012
Digital storytelling constitutes a pedagogical tool for teachers to work on different linguistic skills while generating students’ interest and attention. This study analyses the usefulness of including digital storytelling within a didactic sequence in order to work on linguistic routines such as greetings and leave-takings in English as a foreign language. To this aim, we have worked with first year students in the Faculty of Education at the Universitat de València to improve their ability to adapt their language skills to specific situations within common daily interaction. We have designed a didactic sequence consisting of different workshops that have been put into practice in class. …
Homeostasis in school science: analysis of the subject and results of a proposal for classroom work
2016
El trabajo presenta un breve repaso del nacimiento del concepto de homeostasis en la historia de la fisiología. Se ha realizado un estudio de aula con estudiantes de tercer curso de secundaria apreciando las dificultades que estos presentan para construir una visión holista del concepto de homeostasis. La ciencia escolar porta una iconicidad múltiple, derivada del lenguaje experto, que en muchos casos se revela como un obstáculo para el aprendizaje de los estudiantes novatos. Siendo la homeostasis un concepto básico en la estructura del curriculum nacional se hace una llamada para ahondar en su investigación didáctica.