A study of the light sensitivity of birch bark     

Season Tse  Carole Dignard  Sonia Kata  Eric J. Henderson 《文物保护研究》2018,63(7):423-440

Birch bark is commonly found in indigenous collections in Canadian museums. It is empirically known that light can cause the cambium side of birch bark to change colour. The purpose of this research is to better assess the light sensitivities of various colours of birch barks, and the manner, degree, and rate of colour change during light exposure. Six barks with different colours were used: beige, yellow, orange, orange-brown, red, and brown. Samples were exposed to daylight through a north-facing window (window), LED light from an enclosed chamber (LED), and the Newport-Oriel microfade tester (MFT). Window and MFT samples received a total light dose of approximately 25 Mlux-hours, and LED samples, 182 Mlux-hours. Colour monitoring of the samples showed that almost all barks initially darkened and then faded. Daylight through window caused the most rapid and extensive darkening and fading. Bluewool (BW) ratings for window samples were the lowest (most light sensitive). The MFT and LED samples showed a similar degree of colour change, with the same dose, despite the difference in intensity. Ratings of MFT samples are within one BW step difference compared to LED samples. The rate and extent of initial darkening depended on the colour of the bark; the middle range orange-toned barks showed the most rapid and extensive darkening followed by fading.  相似文献   

Introduction to the special issue honoring the intellectual life and legacy of Professor Tamar Liebes, 1942–2015     

Andrea Press  Sonia Livingstone 《The Communication Review》2016,19(4):249-250

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Atypical predictive processing during visual statistical learning in children with developmental dyslexia: an event-related potential study     

Sonia Singh  Anne M. Walk  Christopher M. Conway 《Annals of dyslexia》2018,68(2):165-179

Previous research suggests that individuals with developmental dyslexia perform below typical readers on non-linguistic cognitive tasks involving the learning and encoding of statistical-sequential patterns. However, the neural mechanisms underlying such a deficit have not been well examined. The aim of the present study was to investigate the event-related potential (ERP) correlates of sequence processing in a sample of children diagnosed with dyslexia using a non-linguistic visual statistical learning paradigm. Whereas the response time data suggested that both typical and atypical readers learned the statistical patterns embedded in the task, the ERP data suggested otherwise. Specifically, ERPs of the typically developing children (n?=?12) showed a P300-like response indicative of learning, whereas the children diagnosed with a reading disorder (n?=?8) showed no such ERP effects. These results may be due to intact implicit motor learning in the children with dyslexia but delayed attention-dependent predictive processing. These findings are consistent with other evidence suggesting that differences in statistical learning ability might underlie some of the reading deficits observed in developmental dyslexia.  相似文献   

Achievement in Science as a Function of the Mobility—Fixity Dimension     

Mansoor Niaz  Grecia Saud De Nuñez  Sonia Rodriguez Rojas 《教育心理学》1994,14(3):283-290

The characteristic of field‐independent subjects to function consistently in a field‐independent fashion (i.e. fixity) and of others to vary more according to circumstances (i.e. mobility) has been referred to as the Mobility‐Fixity Dimension. This dimension, based on the theories of Werner, Witkin and Pascual‐Leone suggests, that field mobile students perform better than fixed students in science courses. The main objective of this study, based on high school students (mean age = 16.5 years; SD = 1.0) in Venezuela, was to test the following predictions. (1) Mobile students would obtain a better performance than fixed students on variables such as introductory high school mathematics, physics, chemistry, biology and earth science courses; and (2) among mobile students, those classified in the middle‐high range of the Group Embedded Figures Test (GEFT) and the Figural Intersection Test (FIT), would obtain a better performance as compared to those in the lower‐middle range. Results obtained, in general, provide support for the first prediction. The differences between the performances of mobile and fixed groups were, however, significant (p < 0.05) only for the biology and earth science courses. Students in one of the high mobility groups obtained a better performance (in all courses) than not only the corresponding low mobility group but also a fixed group with high scores on both the GEFT and FIT, which provides support for the second prediction. It is concluded that problem‐solving ability in science courses may be strengthened through the mediation of the Mobility‐Fixity Dimension.  相似文献   

Prekindergarten Interactive Book Reading Quality and Children’s Language and Literacy Development: Classroom Organization as a Moderator     

Sonia Q. Cabell  Tricia A. Zucker  Jamie DeCoster  Carolina Melo  Lindsay Forston  Bridget Hamre 《Early education and development》2019,30(1):1-18

Research Findings: This study examined the association between interactive book reading quality and prekindergarten children’s gains in language and literacy skills over the course of an academic year for 96 teachers and 417 children across multiple locations in the United States. Two moderators were examined, namely, children’s initial skill level and teachers’ classroom organization during an interactive read-aloud session. In keeping with prior research, interactive book reading quality, measured by examination of teachers’ extratextual talk, was positively and significantly related to children’s development of both language and literacy skills. Interactive book reading quality was not significantly moderated by children’s initial skills, with the exception that interactive book reading quality appeared most beneficial to children’s print knowledge for children entering prekindergarten with relatively low skill. The unique contribution of this study is that the association between interactive book reading quality and children’s expressive vocabulary was dependent on an organized classroom during the book reading session. Practice or Policy: The quality of teachers’ talk during interactive book reading may matter for children’s vocabulary development only when reading sessions are characterized by relatively high classroom organization. Classroom organization should be an important consideration while planning for interactive book reading sessions.  相似文献   

Tactical behaviour of winning athletes in major championship 1500-m and 5000-m track finals     

Sonia Aragón  Javier Arana  M. Teresa Anguera  Belén Garzón 《European Journal of Sport Science》2016,16(3):279-286

This article analyses the tactics employed by middle-distance (1500-m) and long-distance (5000-m) runners from an observational methodology perspective. The subject of investigation has received little attention from specialists in the field of athletics, with most research focusing on physiological studies of athlete performance. Using an ad hoc observation tool and a database containing systematically recorded data we detected time patterns (T-patterns) within the data recorded using the Theme software program (version 5.0), and analysed the tactics employed by winners of the men's 1500-m and 5000-m finals of the World Championships in Athletics [Edmonton 2001, Paris 2003, Helsinki 2005 (1500-m final only), Osaka 2007 (1500-m final only), Berlin 2009 and Daegu 2011], the European Athletics Championships (Munich 2002, Göteborg 2006, and Barcelona 2010) and the Olympic Games (Sydney 2000, Athens 2004, Beijing 2008 and London 2012). T-pattern detection and investigation of the relationship between category systems corresponding to the criteria comprising the observation tool revealed both similarities (starting lane and lane used during race, runner's position during race and sprint zone and lane) and differences (variations in pace, zones in which changes of pace occur, sprint initiation zone and winner's position at the start of the sprint) between the two disciplines.  相似文献   

Search behavior in cats and dogs: Interspecific differences in working memory and spatial cognition     

François Y. Doré  Sylvain Fiset  Sonia Goulet  Marie -Chantale Dumas  Sylvain Gagnon 《Learning & behavior》1996,24(2):142-149

Cats’ and dogs’ search behavior was compared in different problems where an object was visibly moved behind a screen that was then visibly moved to a new position. In Experiments 1 (cats) and 2 (dogs), one group was tested with identical screens and the other group was tested with dissimilar screens. Results showed that in both species, search behavior was based on processing of spatial information rather than on recognition of the visual features of the target screen. Cats and dogs were unable to find the object by inferring its invisible movement. They reached a high level of success only if there was direct perceptual evidence that the object could not be at its initial position. When the position change was indicated by an indirect cue, cats searched more at the object’s initial than final position, whereas dogs searched equally at both positions. Interspecific similarities and differences are interpreted in terms of the requirements for resetting working memory.  相似文献   

Contract cheating in Australian higher education: a comparison of non-university higher education providers and universities     

Tracey Bretag  Rowena Harper  Kiata Rundle  Philip M. Newton  Cath Ellis  Sonia 《Assessment & Evaluation in Higher Education》2020,45(1):125-139

Abstract

This article reports on one aspect of a nationally funded research project on contract cheating in Australian higher education. The project explored students' and educators’ experiences of contract cheating, and the contextual factors that may influence it. This article reports the key findings from non-university higher education providers (NUHEPs). It compares survey responses from 961 students and 91 educators at four NUHEPs with previously reported findings from eight universities (14,086 students and 1,147 staff). NUHEP and university students report engaging in contract cheating in similar ways. However, while NUHEP educators spend more time teaching academic literacies and discussing contract cheating, NUHEP students are 12 times more likely than university students to report use of a professional academic writing service. Both NUHEP and university educators require systematic professional development regarding the relationship between the teaching and learning environment and students’ contract cheating behaviour. NUHEPs need to be cognisant of students’ vulnerability to commercial contract cheating services, and ensure they have access to timely academic and social support.  相似文献   

Perceived ability and success: which self-efficacy measures matter? A distance learning perspective     

Lerato Sonia Tladi 《Open Learning》2017,32(3):243-261

This paper sought to determine the effects of three self-efficacy measures on the academic attainment of students who were enrolled for the first time at the University of South Africa (Unisa) in 2015. The measures of interest were self-regulated learning efficacy, distance learning self-efficacy and computer and online technologies self-efficacy. Overall, only DLSE was found to have a significant effect on academic attainment albeit with a low effect (r = ?.13), explaining only 1.7% of the variation in the academic achievement between successful and unsuccessful students. DLSE also explained 10% of the variation in academic achievement between successful and unsuccessful students who, although new to Unisa, were not new to higher education.  相似文献   

Instructional technologies in developing countries: A contextual analysis approach     

Sonia Arias  Kevin A. Clark 《TechTrends》2004,48(4):52-55

Conclusion This paper proposes an expanded context-based analysis approach for implementing instructional technology in developing countries by calling for the front-end analysis phase of the design process to include an analysis of the socio-cultural, environmental and institutional factors surrounding the instructional problem. Given that there is an increased application of instructional technology in developing countries and limited human capacity to appropriately design instructional technology interventions, it is imperative that instructional designers working in developing countries take into account the contextual factors outlined in the adapted Tessmer and Richey (1997) model. This adapted context-based analysis model for instructional design, if appropriately applied, may increase the probability of successful instructional technology initiatives in developing countries. Although this context-based model was expanded to include factors related to developing countries, the factors described in this paper exist in developed country settings as well. The authors would, therefore, encourage the use of this expanded model in settings that can include, but are not limited to, certain rural and urban areas in industrialized countries as well.  相似文献