排序方式： 共有92条查询结果，搜索用时 62 毫秒
81.
Terje Grntoft Marianne Odlyha Peter Mottner Elin Dahlin Susana Lopez-Aparicio Slawomir Jakiela Mikkel Scharff Guillermo Andrade Michal Obarzanowski Morten Ryhl-Svendsen David Thickett Stephen Hackney Jrgen Wadum 《Journal of Cultural Heritage》2010,11(4):81-419
Pollutants and their potential degradation of paintings have been measured for the first time in microclimate frames (mc-frames), which are used to protect paintings. The pollutants that were measured include both inorganic pollutants, which originate mainly from external sources, and organic pollutants from mainly internal sources. Those originating from the outdoors enter rooms and subsequently mc-frames at a rate depending on the ventilation rates (air exchange rates) of the mc-frames. The concentration of gaseous pollutants emitted within the mc-frames will depend on net emission rates of the materials used to make the mc-frames, their design, and their ventilation rates. In the EU PROPAINT project measurements of gaseous air pollutants and climatic conditions were performed at various locations both inside and outside different state-of-the-art mc-frames. Diffusive passive pollution gas samplers were used together with different types of dosimeters. Results show that the dosimeters respond to either the photo-oxidizing conditions or the level of volatile organic acids in the environments both in the museums and within the mc-frames. Two dosimeters, the Early Warning Organic (EWO) made from a synthetic polymer and the Resin Mastic coated Piezo electric Quartz Crystals (RM-PQC) respond to photo-oxidation and showed higher values outside than inside the mc-frames. Two other dosimeters, the Glass Slide Dosimeter (GSD) and the Lead coated Piezo electric Quartz Crystals (L-PQC) respond to volatile organic acids and yielded higher values inside than outside the mc-frames. This study emphasizes the need for further work to determine environmental damage functions for paintings, in particular for the effects of organic acids. Such information is essential for the evaluation of the protective effects of mc-frames for paintings. The use of mc-frames is increasing and it is very important to know that this protective measure does not introduce new risks. 相似文献
82.
Does the public communication of science influence scientific vocation? Results of a national survey
Stekolschik G Draghi C Adaszko D Gallardo S 《Public understanding of science (Bristol, England)》2010,19(5):625-637
The purpose of this work was to determine if public communication of science and technology (PCST) has any influence on people's decision to become dedicated to scientific research. For this reason, a national survey involving 852 researchers from all disciplines was conducted in Argentina. The results showed that the factors affecting scientific vocation are many, and that, regardless of differences in gender, age or discipline, the greatest influence on the decision to go into scientific research is exerted by teachers. The analysis also demonstrated that different manifestations of PCST (science books, press articles, audiovisual material, and activities such as visits to science museums) play a significant role in awakening the vocation for science. From these results it may be stated that PCST--in addition to its function of informing and forming citizens--exerts a significant influence in fostering scientific vocation. 相似文献
83.
This paper studies the social side of pre-service teacher education and draws on social network analysis to explore the relation between the social capital of pre-service teachers and their academic and professional success. An online survey was applied to a sample of 321 students enrolled full time either in Preschool Education or Primary Education programmes at the Ramon Llull University-FPCEE Blanquerna in Catalonia, Spain. The instrument consisted of a combination of social network questions and rating scale attributes. Findings allow us to understand the relationship between aspects of the cohort’s social network and key development constructs and demonstrate the importance of considering informal interactions within the programme to improve the performance of pre-service teachers. 相似文献
84.
This study employed open-ended questions on a survey, a focus group interview and participant observations to document the perspectives of Latina paraeducators concerning the challenges and support systems they encountered in order to complete college and gain admission to a teacher certification program. Findings reveal that their challenges included a lack of knowledge about higher education, unresponsive institutional bureaucracies, and the need for financial aid. Family and a cohort group of peers were identified as important sources of support and motivation. As a result of the struggles they experienced these paraeducators expressed a strong commitment of helping others to pursue academic and professional goals. This work highlights the need to critique and transform fundamental inequities within institutional structures that obstruct equal educational opportunities and hinder the recruitment of bicultural teachers.These authors are affiliated with Department of Elementary and Bilingual Education, California State University Fullerton, CA. 相似文献
85.
Rosario Ordoñez-Jasis Susana Y. Flores Pablo M. Jasis 《Journal of Early Childhood Teacher Education》2013,34(1):4-19
It is well documented in the literature that early pre-K reading experiences prepare children for the benefits of formal literacy instruction in the later grades. This is particularly true for young children from nonmainstream backgrounds. The objective of this article is to share the findings of a 4-year qualitative study investigating the relationships forged and teaching ideologies constructed by Latino pre-K teachers via critical “storying” within a culturally responsive professional learning community. Findings suggest that as teachers learned to recognize, listen to, and learn from the personal/professional individual and collective life histories of each other, their teaching efficacy was enhanced increasing their ability to develop effective literacy instruction that was culturally and linguistically responsive to the needs of young children. 相似文献
86.
Early Childhood Education Journal - Head Start (HS) teachers are central to providing constructive adult–child interactions that prepare preschool-age students for school and future... 相似文献
87.
Alicia Perdigones Susana Benedicto Elvira Sánchez-Espinosa Eutiquio Gallego José L. García 《European Journal of Engineering Education》2014,39(3):300-308
The aim of this work was to compare the curricula of three different agricultural engineering courses and to determine the competence of graduating students in three subject areas in order to identify possible shortfalls in the number of hours of instruction (HI) required for full competence to be attained.
A total of 132 students sat a voluntary examination in the final year of their studies to determine their competence in three subject areas: electrical facilities, machinery and construction. The degree courses completed by these students are meant to provide them with the legal standing required to undertake infrastructure projects in agricultural installations.
This work detected significant differences in the competence of graduates in the mentioned subjects, depending on the number of HI they had received. Students who had received under 120 HI in these subjects were found to be significantly less competent than those who had received more. 相似文献
88.
Luisa Soares-Miranda Gavin Sandercock Susana Vale Pedro Silva Carla Moreira Rute Santos 《Journal of sports sciences》2013,31(10):1011-1018
Abstract The aim of this study was to examine differences in traditional heart rate variability measurements and heart rate complexity (sample entropy) in young adults grouped by objectively measured achievement of either moderate or both moderate and vigorous physical activity recommendations. Of 168 young adults tested (86 females, 82 males; age 20.5 ± 1.2 years), 119 achieved only recommendations for moderate physical activity (moderate group) and 49 achieved recommendations for both moderate and vigorous physical activity (vigorous group). Analysis of covariance controlling for sex, weekly minutes of moderate physical activity, and percentage of body fat was used to assess between-group differences in heart rate variability and heart rate complexity. Logistic regression analysis was used to determine the group characteristics that best predicted high heart rate complexity and vagal indices of heart rate variability. The majority of the autonomic measures were higher (P < 0.05) in the vigorous group, and regression analysis showed that vigorous physical activity was the only multivariate predictor of higher heart rate complexity and higher heart rate variability. Young adults engaged in regular vigorous physical activity were more than twice as likely to have high heart rate complexity than those involved in predominantly moderate exercise. These findings suggest that vigorous physical activity is more closely associated with high heart rate complexity than moderate physical activity in young adults. 相似文献
89.
Susana Menéndez 《Cultura y Educación》2018,30(3):460-490
This study analyses some psychosocial dimensions (level and type of activity, self-perceived health, self-efficacy in relation to ageing and social support) in non-dependent older people. The sample comprises students of a university programme for older people (PUM) as well as older people who did not participate in the educational activity. Results show similarities and differences between both groups; namely, the older people on the PUM programme were more physically active and participated more in formal activities. Three profiles of older people were identified: a less active group, with lower scores in the indicators assessed; a second group who were socially active, particularly at a family level, with intermediate levels in the dimensions analysed; and a third group who were very active at a formal level (principally made up of the PUM students) and with the best self-efficacy indices in relation to ageing and self-perceived health. Involvement in formal educational activities is related to more satisfactory and positive profiles in old age, and is a highly relevant resource for the promotion of well-being at this stage of life. 相似文献
90.
Katherine Strasser Michelle Darricades Susana Mendive Gabriela Barra 《Early education and development》2018,29(3):357-378
Research Findings: This study examines the association between preschool classroom activity and the quality of the language spoken by teachers and children. Eighteen classrooms serving low-income children between the ages of 3 and 4 in Santiago de Chile were audio-recorded during one morning shift. Recordings were transcribed and segmented into activities (greeting, learning experience, book sharing, book discussion, breakfast, lunch, free play and other noninstructional time). A total of 113 activity segments were identified. Characteristics of teacher and child language were measured in each segment. Differences between the eight activities were examined using analysis of variance. Activities were classified as instructional or noninstructional, and the association between this dimension and language characteristics was examined using multilevel path analysis. Results show that most of the variance in language outcomes occurs within classrooms. Analyses show that a significant portion of the variance in the way teachers and children talk is explained by the instructional/noninstructional dimension. Instructional activities are characterized by more language stimulation, more teaching, fewer directives, and more child talk than noninstructional activities. Practice or Policy Implications: We discuss implications for teacher professional development and early childhood education improvement in general and for Latin-America specifically. 相似文献