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21.
Satellite remote sensing techniques can be used for conducting environmental change detection studies following a natural disaster. Modern computer technology and free access to global satellite imagery allows educators to introduce undergraduate students to the fields of remote sensing and encourage their scientific participation through a research assignment that also serves as an educational exercise. The undergraduate physical science laboratory manuals used in higher education that contain printed remote sensing material often fail to effectively achieve these goals. This class exercise utilizes digital satellite imagery for studying the floods that resulted in the Paraná River region in South America during El Niño 1997–98. In addition, it examines vegetation cover and spectral profiles from the study area in order to further understand and assess the changes that were caused by this recurrent climatic anomaly. 相似文献
22.
This study was designed to investigate the relationship between students' views of the nature of scientific knowledge and
their own learning of physics, and the evolution of this relationship over time. Twenty-three students enrolled in a physics
course that emphasised laboratory work and discussions about the nature of science. Over a 15-month period, an extensive data
base was established including student essays and interviews regarding their views of the nature of science and teaching and
learning of physics. As part of an extensive data generation, students read a book on the epistemology of physics, wrote reflective
essays, and subsequently discussed the epistemology of physics in class. Two intensive case studies are used to illustrate
our understanding of students' views over time. Changes in students' views concerning the nature of scientific knowledge and
of the science teaching and learning process, which were not always complementary, are described with the aid of a model.
The findings of this research have direct relevance to the planning and implementation of science courses in which the development
of understandings of the nature of science is an objective. 相似文献
23.
The school-age population in North America is characterized by increasing linguistic, cultural, and ethnic diversity. The authors argue that non-mainstream students do not perform as well in schools as mainstream students (predominantly whilte, middle-class English speakers) because they are not equitably served by the educational system. They explore some of the complexities of educational equity and consider equity issues in the literacy education of language minority students from four different perspectives: individual student characteristics, sociocultural factors, language issues, and instructional issues. In support of their position, they examine each of these areas in turn, providing illustrations and analysis. They conclude with several principles upon which to build practices to make literacy education more equitable for all students. 相似文献
24.
25.
Recent Chinese migrant students from Taiwan studying science in two Australian secondary schools were found to explain the
meanings of selected science concept labels in English by translating from Chinese. The research strategy involved interviewing
the students concerning their recognition and comprehension of the science concept labels firstly in Chinese and then in English.
Mean recognition and comprehension scores were higher in Chinese than in English, with indications that Chinese language and
science knowledge learnt in Chinese deteriorated with increasing time of residence in Australia. Rudimentary signs of the
students being able to switch between Chinese and English knowledge bases in science were also found. Implications for teaching
science to ESL students and suggestions for further research are discussed. 相似文献
26.
27.
In three experiments, the time horizon over which the rat evaluates alternative feeding sources was investigated. The time horizon was measured by the suppression of intake of one incentive (a 0.15% saccharin solution) when a preferred alternative incentive (a 32% sucrose solution) was available but delayed. In Experiment 1, we found a direct function between the amount of saccharin intake and the delay time before access to 32% sucrose. Compared with intake for a saccharin-only control, saccharin intake was suppressed before 4-min and 16-min sucrose delays, but not before a 32-min delay. Because previous work (Flaherty & Checke, 1982) had reported suppression before a delay of nearly 32 min, in the subsequent experiments we examined factors that might account for this difference. In Experiment 2, we found that saccharin intake was suppressed before a 32-min delay interval when saccharin and sucrose solutions were presented in a bright-novel test environment but not when the same solutions were presented in the home cage. In Experiment 3, we found that the time between testing and subsequent postsession feeding could also affect the suppression of saccharin intake. Saccharin intake was suppressed when access to 32% sucrose was delayed by 32 min and the test situation was followed by immediate postsession feeding, but not when postsession feeding was delayed by 90 min. These results thus extend estimates of the rat’s time horizon to at least 32 min, but indicate that the effective time horizon can vary, depending on the test situation. 相似文献
28.
29.
Professor Wolff-Michael Roth Campbell J. McRobbie Keith B. Lucas 《Research in Science Education》1998,28(1):107-118
We analyse and explore, in the form of dialogues and metalogues questions about the dialogic nature of beliefs and students
belief talk about the nature of science and scientific knowledge. Following recent advances in discursive psychology, this
study focuses not on students' claims but on the discursive resources and dialogical practices that support the particular
claims they make. We argue that students' discourse is better understood as a textual bricolage that is sensitive to conversational
context, common sense, interpretive repertoires, and textual resources available in the conversational situation. Our text
is reflexive as it embodies the discursive construction of knowledge and undercuts any claims to authoritative knowledge.
The very conception of “belief” is itself an expression or construction from within the mundane idiom.... We learn to use
“belief” in conditions when the “objective facts” are unknown or problematic and we want to indicate the tenuous character
of our claim.... The notion of “real world” or “objective reality” is embedded in an extensive, pervasive language game which
includes as an intelligible move or possibility the use of the very concept of “belief” itself. (Pollner, 1987, p. 21) 相似文献
30.
Maureen J. Reed Deborah J. Kennett Tanya Lewis Eunice Lund‐Lucas Carolyn Stallberg Inez L. Newbold 《高等教育研究与发展》2009,28(4):385-400
Little is known about the relative effects of post‐secondary learning services for students with learning disabilities. We compared outcomes for students with learning disabilities who selected to: (1) take an academic learning success course (course‐intervention), (2) have regular individual interventions (high‐intervention) or (3) use services only as needed (low‐intervention). Pre‐ and post‐test comparisons revealed improvements in academic self‐efficacy and academic resourcefulness for students in the course‐ and high‐intervention groups. The course‐intervention group also showed decreases in their failure attributions to bad luck and increases in their general repertoire of learned resourcefulness skills in comparison to the high‐intervention group and had significantly higher year‐end GPAs in comparison to the low‐intervention group. Here we find positive outcomes for students with learning disabilities taking a course that teaches post‐secondary learning and academic skills. 相似文献