Eugenics: Then and now     

Staffan Müller-Wille 《Metascience》2011,20(2):347-349

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University physics students’ ideas of thermal radiation expressed in open laboratory activities using infrared cameras     

Jesper Haglund  Emil Melander  Matthias Weiszflog  Staffan Andersson 《Research in Science & Technological Education》2017,35(3):349-367

Background: University physics students were engaged in open-ended thermodynamics laboratory activities with a focus on understanding a chosen phenomenon or the principle of laboratory apparatus, such as thermal radiation and a heat pump. Students had access to handheld infrared (IR) cameras for their investigations.

Purpose: The purpose of the research was to explore students’ interactions with reformed thermodynamics laboratory activities. It was guided by the research question: How do university physics students make use of IR cameras in open-ended investigation of thermal radiation as a phenomenon?

Sample: The study was conducted with a class of first-year university physics students in Sweden. The interaction with the activities of four of the students was selected for analysis. The four students are males.

Design and methods: We used a qualitative, interpretive approach to the study of students’ interaction. The primary means of data collection was video recording of students’ work with the laboratory activities and their subsequent presentations. The analysis focused on how IR cameras helped students notice phenomena relating to thermal radiation, with comparison to previous research on students’ conceptions of thermal radiation.

Results: When using the IR camera, students attended to the reflection of thermal radiation on shiny surfaces, such as polished metals, windows or a whiteboard and emissive properties of surfaces of different types. In this way, they went beyond using the technology as a temperature probe. Students were able to discuss merits and shortcomings of IR cameras in comparison with digital thermometers.

Conclusions: With the help of IR cameras, university physics students attend to thermal phenomena that would otherwise easily go unnoticed.  相似文献   

Analysis of performance in orienteering with treadmill tests and physiological field tests using a differential global positioning system     

Larsson P  Burlin L  Jakobsson E  Henriksson-Larsén K 《Journal of sports sciences》2002,20(7):529-535

The aim of this study was to determine the physiological responses to orienteering by examining the interrelationships between the information provided by a differential global positioning system (dGPS) about an orienteer's route, speed and orienteering mistakes, portable metabolic gas analyser data during orienteering and data from incremental treadmill tests. Ten male orienteers completed a treadmill threshold test and a field test; the latter was performed on a 4.3 km course on mixed terrain with nine checkpoints. The anaerobic threshold, threshold of decompensated metabolic acidosis, respiratory exchange ratio, onset of blood lactate accumulation and peak oxygen uptake (VO2peak) were determined from the treadmill test. Time to complete the course, total distance covered, mean speed, distance and timing of orienteering mistakes, mean oxygen uptake, mean relative heart rate, mean respiratory exchange ratio and mean running economy were computed from the dGPS data and metabolic gas analyser data. Correlation analyses showed a relationship between a high anaerobic threshold and few orienteering mistakes (r = - 0.64, P < 0.05). A high threshold of decompensated metabolic acidosis and VO2peak were related to a fast overall time (r = -0.70 to -0.72, P < 0.05) and high running speed (r = 0.64 to 0.79, P < 0.05 and P < 0.01, respectively), and were thus the best predictors of performance.  相似文献   

Evaluation of a specific test in cross-country skiing     

E Mygind  B Larsson  T Klausen 《Journal of sports sciences》1991,9(3):249-257

Six Danish male cross-country skiers were studied during the end-of-summer and winter seasons. Their maximal oxygen uptake was measured while running on a treadmill and using a ski ergometer incorporating the double-poling technique. Maximal oxygen uptake during treadmill running and double-poling was correlated with performance, expressed as a ranking score during 10 ski races. The tests were undertaken in September, December and April. Upper body maximal oxygen uptake increased 5.8% from September to December, decreasing to 2.3% above the September level in April. Upper body work output (2 min at maximal intensity) increased 11.8% from September to December (P less than 0.05). The relationship between upper body and leg maximal oxygen uptake--the upper body/leg ratio--was 89.4% in September. In four skiers, both treadmill and upper body tests were undertaken on each test occasion. The upper body/leg ratio changed from 87.7% in September to 95.7% in December. In April, the ratio was 91.0%. The maximal oxygen uptake measured using the ski ergometer during double-poling was significantly correlated with performance (P less than 0.05). It is concluded that the upper body ski ergometer can be used in the evaluation of elite cross-country skiers.  相似文献   

Grasping the essence of a science activity by using a model of pedagogical reasoning and action     

Jonna Larsson 《Education 3-13》2018,46(7):770-781

This article grasps the essence of how a science content can be foregrounded by elaborating around concepts as floating and sinking, in relation to boats. The data consist of a videotaped authentic session with one preschool teacher and four children. The model of pedagogical reason and action [Shulman, L. S. 1987. “Knowing and Teaching: Foundations of the New Reform.” Harvard Educational Review 57 (1): 1–23. doi:10.17763/haer.57.1.j463w79r5645541] constitutes the analytical lens. The results show that the content is framed within a series of creative activities where children’s suggestions of how to act are crucial. The scientific content is approached according to the children’s verbalisations of their understandings. Furthermore, dialectical relationships become the main tool when making the content visible.  相似文献   

Curriculum Development for Social Inclusion in Sweden     

Beijer  Mai  Bolin  Staffan 《Prospects》2003,33(1):51-62

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“Shut up and calculate”: the available discursive positions in quantum physics courses     

Anders?JohanssonEmail author  Staffan?Andersson  Minna?Salminen-Karlsson  Maja?Elmgren 《Cultural Studies of Science Education》2018,13(1):205-226

Educating new generations of physicists is often seen as a matter of attracting good students, teaching them physics and making sure that they stay at the university. Sometimes, questions are also raised about what could be done to increase diversity in recruitment. Using a discursive perspective, in this study of three introductory quantum physics courses at two Swedish universities, we instead ask what it means to become a physicist, and whether certain ways of becoming a physicist and doing physics is privileged in this process. Asking the question of what discursive positions are made accessible to students, we use observations of lectures and problem solving sessions together with interviews with students to characterize the discourse in the courses. Many students seem to have high expectations for the quantum physics course and generally express that they appreciate the course more than other courses. Nevertheless, our analysis shows that the ways of being a “good quantum physics student” are limited by the dominating focus on calculating quantum physics in the courses. We argue that this could have negative consequences both for the education of future physicists and the discipline of physics itself, in that it may reproduce an instrumental “shut up and calculate”-culture of physics, as well as an elitist physics education. Additionally, many students who take the courses are not future physicists, and the limitation of discursive positions may also affect these students significantly.  相似文献   

On the determinants of employment-related organised education and informal learning     

Staffan Nilsson  Kjell Rubenson 《Studies in Continuing Education》2014,36(3):304-321

This paper analyses the distribution of employment-related organised education and informal learning in the Canadian workforce. The paper draws on a large-scale survey, the Changing Nature of Work and Lifelong Learning (WALL), which was based on structured and standardised telephone interviews with a representative sample of 5783 Canadian members of the employed labour force. In exploring the determinants facilitating employment-related informal learning, three analytical categories of factors derived from previous research on learning participation were used: individual-level factors, job characteristics and workplace environment. The analyses focus on differences in individuals, jobs and workplace characteristics among adult workers who acquired or improved their job-related skills through different training pathways. In addition, analyses were performed to compare the extent to which these factors differ in their influence on learning decisions among workers who combine both organised education and informal learning and those who receive only informal learning. The results indicate that important predictors of participation in employment-related organised education and informal learning are age, educational attainment, learning skills, occupational class, education-job relation, degree of autonomy, degree of labour intensity, principal area of production and organisation size.  相似文献   

Student Learning about Biomolecular Self-Assembly Using Two Different External Representations     

Gunnar E. H?st  Caroline Larsson  Arthur Olson  Lena A. E. Tibell 《CBE life sciences education》2013,12(3):471-482

Self-assembly is the fundamental but counterintuitive principle that explains how ordered biomolecular complexes form spontaneously in the cell. This study investigated the impact of using two external representations of virus self-assembly, an interactive tangible three-dimensional model and a static two-dimensional image, on student learning about the process of self-assembly in a group exercise. A conceptual analysis of self-assembly into a set of facets was performed to support study design and analysis. Written responses were collected in a pretest/posttest experimental design with 32 Swedish university students. A quantitative analysis of close-ended items indicated that the students improved their scores between pretest and posttest, with no significant difference between the conditions (tangible model/image). A qualitative analysis of an open-ended item indicated students were unfamiliar with self-assembly prior to the study. Students in the tangible model condition used the facets of self-assembly in their open-ended posttest responses more frequently than students in the image condition. In particular, it appears that the dynamic properties of the tangible model may support student understanding of self-assembly in terms of the random and reversible nature of molecular interactions. A tentative difference was observed in response complexity, with more multifaceted responses in the tangible model condition.  相似文献   

Tweeting the Viewer—Use of Twitter in a Talk Show Context     

Anders Olof Larsson 《广播与电子媒介杂志》2013,57(2):135-152

Twitter is currently one of the most popular outlets of so-called social media, Internet services that allow their users to communicate and share content in a variety of ways. As with the Internet itself, Twitter has been heralded to hold interesting possibilities within the context of journalism—potentially bringing journalists and their respective audiences closer to each other through supposedly common Twitter practices like @ messages and retweeting. This article presents a large-scale empirical study on Twitter use in the journalistic context. The aim is to assess patterns of journalist-audience interaction on Twitter. Specifically, the article outlines a structural analysis of Twitter use pertaining to the first season of the current events talk show Hübinette, which aired on Swedish public service television during the fall of 2011. Employing state-of-the-art approaches for data collection and analysis, the article shows that while traditional patterns of journalist-reader relationships are most common, some users are employing the Twitter platform in somewhat unforeseen ways.  相似文献