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31.
In two experiments, one hundred and sixty-two 6- to 8-year-olds were asked to reason counterfactually about events with different causal structures. All events involved overdetermined outcomes in which two different causal events led to the same outcome. In Experiment 1, children heard stories with either an ambiguous causal relation between events or causally unrelated events. Children in the causally unrelated version performed better than chance and better than those in the ambiguous condition. In Experiment 2, children heard stories in which antecedent events were causally connected or causally disconnected. Eight-year-olds performed above chance in both conditions, whereas 6-year-olds performed above chance only in the connected condition. This work provides the first evidence that children can reason counterfactually in causally overdetermined contexts by age 8. 相似文献
32.
Carl-Johan Rundgren Lena A. E. Tibell 《International Journal of Science and Mathematics Education》2010,8(2):223-246
Images, diagrams, and other forms of visualization are playing increasingly important roles in molecular life science teaching
and research, both for conveying information and as conceptual tools, transforming the way we think about the events and processes
the subject covers. This study examines how upper secondary and tertiary students interpret visualizations of transport through
the cell membrane in the form of a still image and an animation. Twenty upper secondary and five tertiary students were interviewed.
In addition, 31 university students participated in a group discussion and answered a questionnaire regarding the animation.
A model, based on variation theory, was then tested as a tool for distinguishing between what is expected to be learned, what
is present in the visualizations, and what is actually learned by the students. Three critical features of the ability to
visualize biomolecular processes were identified from the students’ interpretations of the animation: the complexity of biomolecular
processes, the dynamic and random nature of biomolecular interactions, and extrapolation between 2D and 3D. The results of
this study support the use of multiple representations to achieve different learning goals. 相似文献
33.
The article builds upon a study where students’ relations to science are related to their worldviews and the kind of worldviews
they associate with science. The aim of the study is to deepen our knowledge of how worldview and students’ ways to handle
conflicts between their own worldview and the worldview they associate with science, can add to our understanding of students’
relations to science. Data consists of students’ responses to a questionnaire (N = 47) and to interviews (N = 26). The study shows that for students who have a high ability in science, those who have taken science-intense programmes
in upper secondary school to a higher extent than others have worldviews in accordance with the worldviews they associate
with science. This indicates that students who embrace a worldview different from the one they associate with science tend
to exclude themselves from science/technology programmes in Swedish upper secondary school. In the article the results are
presented through case studies of single individuals. Those students’ reasoning is related to the results for the whole student
group. Implications for science teaching and for further research are discussed. 相似文献
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Lena Liapi 《Cultural and Social History》2017,14(5):549-564
This article reconsiders ideas of the public sphere in the seventeenth century, by focusing on how public opinion is shaped by the movement of information between media and between receivers. It contends that the scholarly preoccupation with a public sphere viewed exclusively in terms of politics obscures the fact that contemporaries did not distinguish between politics and subjects such as crime in their newsgathering. Examining the case study of James Turner, a burglar in the 1660s who became a cause célèbre in London and beyond, this article shows how crime news were eagerly exchanged, informing discussions and constructing public opinion. 相似文献
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38.
Werner Helsper Mareke Niemann Anja Gibson Lena Dreier 《Zeitschrift für Erziehungswissenschaft》2014,17(3):203-219
Looking at two urban higher education regions, in this paper we investigate the question of which positions head teachers of “exclusive” German gymnasiums adopt with regard to concepts such as ‘elite’, ‘excellence’ and thus also to schools’ attempts to distinguish their own profiles in the education system, all the while bearing in mind the context of public discourses about ‘elite’ and ‘excellence’. In doing so, we reconstruct four modes of dealing with the elite concept. All of these modes—even the most positive references—show that for “exclusive” German Gymnasiums the term ‘elite’ is precariously situated, associated as it is with a considerable need for legitimation. By contrast, it is not problematic to refer to a meritocratic elite concept that involves functional academic and leadership elites in the sense of excellence. On the other hand, any association of these upper secondary schools with power, financial and business elites does seem highly problematic and is vehemently rejected. This clear rejection occurs—and this is the central thesis of this article—because otherwise meritocracy itself, as the hegemonic academic form of legitimation, would be threatened to its very core. 相似文献
39.
Lena Jafri Aysha Habib Khan Saba Azeem 《Indian journal of clinical biochemistry : IJCB》2014,29(3):327-332
To determine the concentration of ionized calcium (iCa) collected in lithium heparin and gel tubes and to correlate the measured iCa with calculated iCa. Anaerobic fasting blood samples were simultaneously collected from healthy laboratory workers in lithium-heparin and gel tubes. iCa, pH, total calcium (CaT), total protein and albumin were measured. Ionized Ca was calculated with albumin and globulin values using an appropriate formula. Mean iCa in gel tubes showed a positive constant bias of 0.08 mmol/L (p < 0.001) when compared to lithium heparin results. The mean pH of blood taken in lithium heparin and gel tubes was non-significant (p = 0.3). Measured iCa poorly correlated with CaT (r = 0.2, p = 0.1) and calculated iCa (r = 0.2, p = 0.2). To evaluate the calcium status direct measurement of iCa must be done rather than using the formulae for iCa determination. In addition serum is recommended as the choice of sample for iCa determination in comparison to plasma samples. 相似文献
40.