In recent years, there has been increased interest in examining alternative polymers for the conservation of archaeological artefacts, particularly waterlogged timbers, providing better, renewable, greener alternatives to poly(ethylene glycol) (PEG). The degradation of PEG consolidants in the timbers of the sixteenth century warship Mary Rose has been examined and the rheological and thermal properties of PEG have been compared with its monomethyl and dimethyl ethers and several polysaccharide consolidants (chitosan, guar, and 2-hydroxyethyl cellulose) in order to evaluate their potential as alternative consolidants for the conservation of waterlogged wooden artefacts. Additionally, the effect of the polymers on the archaeological wood was characterised by thermogravimetric analysis and solid-state nuclear magnetic resonance spectroscopy. The results suggest that the future of conservation technologies lies with polysaccharide consolidant materials, which show enhanced compatibility with wooden artefacts with no detectable side effects while also being cheap, with extremely low toxicity, renewable, and sustainably resourced. 相似文献
The article reports on a research and innovation‐based approach to in‐service training for special education in Norway, with a particular focus on vocational education.
The present basis of policy for special education in Norway is stated, and the author goes on to examine the needs of in‐service training in this field. The role of the Norwegian College of Education for Teachers of Vocational Subjects (NCETVS) is described, and the author examines also the developmental project based on Moholt and Brundalen Schools.
Particular attention is given to the role of evaluation in this project. 相似文献
The need for closer co‐operation among academic environments in Yugoslavia can be satisfied by making use of the services of the Yugoslav System for Scientific and Technological Information (SNTIJ). The establishment of the YUNET network and of the non‐profit organization, YUNAC, will permit the linking of Yugoslav networks, with international ones. Thus, the gap between the developed world and Yugoslavia will be bridged, and users will be able to gain access to databases in Yugoslavia and abroad, as well as being able to participate in the creation of new knowledge. 相似文献
Public discussion on the quality of education in different corners of the world very much relies on the data provided by the international large-scale assessment (ILSA) studies. While aware of different methodological keystones and technicalities embedded in these, the idea behind this special issue is to contribute to the understanding of how students solve ILSA items and the kinds of literacy skills they rely on. A shared element of reported studies is that they seek to document and analyse test-taking as a concrete practice using different theoretical and methodological perspectives. We find such scrutiny to be important and significant at this point in time as it offers some new lenses through which ILSA items could be inspected and further discussed. 相似文献
There are still 10 English local educational authorities (LEAs) that are wholly selective and a further 10 with some grammar and secondary modern schools. This article examines the academic performance of pupils in secondary modern schools and the funding of these schools using national data sets matching pupils' performance at Key Stage 2 and General Certificate of Education (GCSE) as well as data on funding from Section 52 statements. Students in secondary modern schools gained one less grade on average than equivalent students in comprehensive schools while grammar school pupils obtained five grades more. After taking account of the cost factors and grant entitlements that influence funding per pupil, secondary modern schools in the years 2000/01–2002/03 were funded around £80 less per pupil while grammar school pupils received over £100 more per pupil compared to comprehensive schools. Secondary modern schools were more likely to be in financial deficit than comprehensive and particularly grammar schools. Thus, students are academically disadvantaged by attending secondary modern schools, which in most selective LEAs do not receive sufficient additional funding to offset the depressing effects on attainment of the increased social segregation arising from a selective system. 相似文献
Teacher education in Czechoslovakia is part of a unified national provision of education; this covers in‐service as well as pre‐service training. The basis is that of training at Higher education level followed by life‐long upgrading.
The Marxist‐Leninist view is that the quality of the teacher is central to the educational process. Consequently, the initial and in‐service training of the teacher are of paramount importance, and the Czechoslovak system aims at an integrated approach to the entire process. In this process, acquisition of ideological, as well as professional, maturity, is seen as essential. Equally, the teacher must master his chosen discipline (s) in the scientific sense.
Additionally, it is important that the teacher be able to participate actively in the community—in, for example, family education, health care and concern for the environment.
Against this background of goals, the author outlines the Czechoslovak institutional provision for initial training, conditions for enrolment and the process of obtaining a post, before providing an in‐depth examination of the country's provision of in‐service education. A final section emphasises the position of the teacher in society, and specifically in socialist society. The teacher is, quite simply, a key figure and teacher education has to be built around this fact.
Svatopluk S. Petrá?ek is Professor of Education and Director of the European Centre of the Charles University for Further Education of Teachers. 相似文献
The purpose of the paper is to present the reasons students at the Faculty of Education in Maribor, Slovenija, chose pedagogy for their study direction, and therefore becoming a teacher. A total 237 second‐year students of the academic year 2003/04 were included in the research. Of the five groups of reasons for choosing this program (altruistic, material, self‐realization and alternative, and reasons arising from aspiration stereotype), students most often asserted self‐realization, including: teaching provides a useful public function for the whole society; as a teacher, I can be an example to children and young people; this profession will give me a chance for professional development during my whole career; and teaching will enable me to use all my abilities (and talents—for example, music, verbal, dancing, etc.) Important differences were found to exist between students of different disciplines. 相似文献
Statistical mediation analysis is used to investigate intermediate variables in the relation between independent and dependent variables. Causal interpretation of mediation analyses is challenging because randomization of subjects to levels of the independent variable does not rule out the possibility of unmeasured confounders of the mediator to outcome relation. Furthermore, commonly used frequentist methods for mediation analysis compute the probability of the data given the null hypothesis, which is not the probability of a hypothesis given the data as in Bayesian analysis. Under certain assumptions, applying the potential outcomes framework to mediation analysis allows for the computation of causal effects, and statistical mediation in the Bayesian framework gives indirect effects probabilistic interpretations. This tutorial combines causal inference and Bayesian methods for mediation analysis so the indirect and direct effects have both causal and probabilistic interpretations. Steps in Bayesian causal mediation analysis are shown in the application to an empirical example. 相似文献
