Resistance to carbonation of concrete after re-alkalization by absorption of sodium carbonate solution

The paper presents experimental research on the durability of a non-conventional technique for the repair of reinforced concrete damaged by carbonation-induced corrosion of steel reinforcement. The technique is called electrochemical re-alkalization and is often considered as an option for the repair of buildings, structures, and other artefacts made of reinforced concrete, for which conservation requirements are becoming increasingly important, in spite of their relatively young age. Absorption of a sodium carbonate solution is one of the processes that lead to concrete re-alkalization. The aim of the work is to investigate the contribution of this process to preventing future carbonation of re-alkalized concrete. Concrete specimens with six different compositions were initially carbonated, then re-alkalized through absorption of a sodium carbonate solution, and then exposed again to carbonation (re-carbonation). The results showed that the pH of concrete after re-carbonation was only slightly lower compared to that of re-alkalized concrete, highlighting a contribution of the treatment in preventing future pH reduction.     

Lexical Semantic Field as One of the Keys to Second Language Teaching

The article is devoted to the problem of the development of skills connected with the acquisition of foreign lexis (Lexis = all possible words or phrases in a language) on the basis of semantic fields (Semantic field = a lexical set of related items, e.g., colour, red, green, blue). This becomes possible due to grouping well-known and unknown to the students lexical units to systemized semantic groups—semantic fields. Semantic fields can be useful for the quantitative and qualitative enrichment of the vocabulary; they serve to choose a lexical unit correctly, to collocate lexical units according to existing norms, to use the lexis of various semantic fields in different contexts without mistakes, to guarantee conscious, automatic language skills of the students and to increase their active vocabulary.     

Planning and Doing in Professional Teaching Practice. A Study with Early Childhood Education Teachers Working with ICT (3–6 years)

Planning is one of the professional tasks teachers have to carry out before their direct action in the classrooms. This planning is closely interrelated to the way teachers teach. The question about how and why teachers reach their decisions in their pre-class planning is a classical one in the research into curricular design and development. The aim of this paper will therefore be to establish whether there is a relationship between curricular planning and curricular practices, studying how nine early childhood education teachers using an ICT resource plan their actions and execute them. For the research, we obtained video recordings of classroom practices and interviewed the teachers just before they went into class. By applying qualitative data analysis, we have been able to identify the elements taken into consideration when the teachers make decisions in lesson, their conceptions about ICT, and the types of activity that are held in all the classes. The results confirm the conclusions reached by previous studies on the relationships between planning and doing, in the sense that the activities, understood to be teaching strategies, are the ones that link the design of what is to be done and direct action. Likewise, the results ratify prior research on the role of materials and resources as aspects that teachers can rely on for support in the management and presentation of classroom tasks and content. The introduction of ICT does not modify the teachers’ curricular planning and development.     

Normalising: Children's activity to construct meanings for trend

This paper looks back over a number of exploratory studies which have researched young children's construction of meanings for graphs, produced from data entered in spreadsheets. In this paper we discuss children's use of normalising, an activity in which children correct data towards some perceived norm. Through normalising, children construct meanings for trend in data and in graphs. We discuss how particular aspects of the pedagogical setting including task design encourage the use of normalising.This revised version was published online in October 2005 with corrections to the Cover Date.     

Are secondary school graduates prepared for the studies of natural sciences? – evaluation and analysis of the result of scientific literacy levels achieved by secondary school graduates

ABSTRACT

Background: In Slovakia, no relevant information is available about the scientific literacy levels achieved by secondary school students.

Purpose: The objective of the research was to identify the levels of scientific literacy among students in the last year of grammar school and examine to what extent this determined the subject chosen for a school-leaving exam, which is related to a student’s personal preferences, as well as to the student’s profile and preparation for university education.

Sample: The research sample consisted of 221 students from 17 grammar schools located in various regions of Slovakia.

Design and methods: To identify the level of scientific literacy, we applied the Test of Scientific Literacy Skills.

Results: The students achieved the lowest success rate in the skill focused on the identification of the research design elements and its strengths and weaknesses. A comparably low success rate was also observed in the skill focused on the justification of the conclusions based on quantitative data. Other difficulties were identified in the field of understanding the basics of statistics, thus indicating an insufficient level of mathematical literacy of the students in the abovementioned field. By contrast, the highest success rate was achieved in the skill focused on the correct application of the scientific results for social purposes.

Conclusions: At the end of secondary school studies, the scientific literacy among Slovak students is at the average level. No differences were observed in terms of gender. In terms of the subjects chosen by the students for their school-leaving exams, we observed that those students who took a school-leaving exam in Biology or Chemistry achieved significantly better results in the test. By contrast, the students who reported on Geography and Civics as the subject of their school-leaving exam achieved significantly worse results in the test.     

You Learn by your Mistakes. Effective Training Strategies Based on the Analysis of Video-Recorded Worked-out Examples

This paper presents an empirical study on procedural learning from errors that was conducted within the field of vocational education. It examines whether, and to what extent, procedural learning can benefit more from the detection and written analysis of errors (experimental condition) than from the correct elements (control group). The study involved 136 commercial employee apprentices who were working on a videorecorded, worked-out example of a professional procedure involving customer counselling. The results showed no differences between the conditions with regards to declarative knowledge acquisition during the procedure. Additionally, the analysis of errors was demonstrated to be more effective than the analysis of correct behaviours in terms of (1) representing a much more detailed and correct procedure and (2) developing anticipatory knowledge about possible errors to be avoided. The results highlighted the value of the inductive instructional strategy (from the analysis of a single worked-out example to the learning of the general procedure) and opened the field up for future applications of a similar instructional approach combining roleplaying and video analysis of errors in vocational education to develop communication skills.     

Doing feminist difference differently: intersectional pedagogical practices in the context of the neoliberal diversity regime

At present there is a small, albeit growing, body of literature on pedagogical strategies and reflections which addresses the ways educators attempt to challenge the effects of neoliberalism on higher education. In this article, we reflect upon our pedagogical practices in higher education in this moment of neoliberal transformation wherein, as Sirma Bilge notes, intersectionality is being ‘undone’ in academic feminism. As graduate students teaching in Toronto, Canada, we describe how our commitment to social justice pedagogy works against this ‘undoing’ of intersectionality by embracing vulnerability, discomfort and the possibility of conflict in classrooms that do not simply accommodate, celebrate or include difference. Given that neoliberal renderings of diversity obscure and reinforce unequal relations of power, we demonstrate how we attend to these power relations, particularly racism which is salient to our teaching context, by employing intersectionality as a pedagogical practice and a political intervention to advance social justice.     

Adolescent English Learners’ Use of Digital Technology in the Classroom

This study looked at how five adolescent English Learners (ELs) in an English as a second language class use the available digital technology. Data collected consisted of classroom observations, student and classroom documents, and focus student interviews. Data collection and analysis were simultaneous processes. Findings suggest adolescent ELs use their personal smartphones and school-provided laptops on a regular basis for entertainment and scaffolding purposes.     

Sources of teacher job satisfaction and dissatisfaction in Cyprus

This paper aims to contribute to the limited literature on teacher job satisfaction in developing countries, especially in Cyprus. Drawing on interviews with 52 teachers and administrators in 17 schools, the paper describes the sources of job satisfaction and dissatisfaction of Cypriot teachers and the impact on how teachers feel. Teachers emphasised their satisfaction with interactions with students, relationships held with colleagues and opportunities to contribute to the growth of individuals and the development of society. Sources of dissatisfaction were social problems and their impact on teachers' work, students' lack of interest and bad behaviour, the centralised educational system and the lack of professional autonomy in schools, and teacher evaluation and promotion prospects. Some of the factors are predictable but others are less so, having to do with the particular historical and social context in Cyprus. The context of a developing country is especially considered in an effort to explore how education officials may address issues of teacher satisfaction and dissatisfaction.