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- Fagevik Olsén, Monika, 1964, et al.
(författare)
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Technical Aspects of Devices and Equipment for Positive Expiratory Pressure With and Without Oscillation
- 2021
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Ingår i: Respiratory care. - : Daedalus Enterprises, Inc.. - 0020-1324 .- 1943-3654. ; 66:5, s. 862-877
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Forskningsöversikt (refereegranskat)abstract
- BACKGROUND: Breathing exercises with positive expiratory pressure (PEP) and oscillating PEP are common treatments for patients with respiratory impairments. There are several trials evaluating the clinical effects of a variety of commercially available and self-made devices. There is a lack of evaluation concerning technical aspects and construction of the devices. The aims of this review were to describe and compare technical aspects of devices and equipment used for PEP and oscillating PEP as a basis for clinical decisions regarding prescriptions.METHODS: In this systematic review, we included trials evaluating different technical aspects of devices and equipment for PEP and oscillating PEP until June 2019. The literature search was performed in PubMed, CINAHL, Cochrane Library, Embase and PEDro.RESULTS: The literature search resulted in 812 studies, which, after being read by 2 independent reviewers, were reduced to 21 trials that matched the inclusion criteria. The achieved PEP is dependent on the given resistance or achieved expiratory flow through the devices and their separate parts. Oscillation frequency in oscillating PEP devices affects the pressure and oscillation amplitude and flow. For some devices, the device's position also has an impact on the outcome. There are similarities and differences among all of the devices, and the equipment components are not interchangeable without changing the achieved PEP levels.CONCLUSIONS: Many devices are available to provide PEP and oscillating PEP treatment. These devices differ substantially in design as well as in performance. When using PEP devices, it is important to understand how all parts of the devices affect outcomes. An increased understanding of how PEP is produced for the spontaneously breathing patient is important to achieve desired treatment effects.
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| 2. |
- Bergman Ärlebäck, Jonas, 1972-, et al.
(författare)
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Developing and testing a framework for analysing, comparing and visualizing content matter in and across mathematics textbooks
- 2022
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Ingår i: The relation between mathematics education research and teachers’ professional development.. - 9789198402452 ; , s. 105-115
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Konferensbidrag (refereegranskat)abstract
- In this methodological paper we discuss the development and testing of a framework for analysing and visualizing the overall structure of the content and tasks in mathe-matics textbooks. The aim of the framework is to provide a lens on mathematics textbooks at the secondary level that is mathematics topic- and content-area-unbiased to facilitate an as objective as possible comparisons between both (a) different contents, topics, and tasks within a textbook; and (b) contents, topics, and tasks across different series of textbooks or within a textbook series. The paper explores the results of the framework applied to four mathematical textbook chapters visualized in terms of so-called hierarchy charts. Inter-rater coding reliability with respect to a developed coding manual, and future development and applications of the framework is also discussed.
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| 3. |
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| 4. |
- Bergman Ärlebäck, Jonas, 1972-, et al.
(författare)
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Eliciting pre-service secondary teachers’ initial ideas of sampling
- 2021
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Ingår i: <em>Sustainable mathematics education in a digitalized world. </em>. - Göteborg. ; , s. 234-244
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- This paper investigates secondary pre-service teachers’ strategies of sampling. The work of eight groups of pre-service secondary teachers asked to devise and imple- ment a sampling strategy to answer two questions about three given populations of different sizes are analyzed. The result presented highlights the models devised and used by the groups. The paper especially discusses the pre-service teachers’ models of samplings in term of how the number of samples and sample size used were decided on in the model as fixed, interval-static, or dynamic.
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| 5. |
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| 6. |
- Bergman Ärlebäck, Jonas, 1972-, et al.
(författare)
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Exploring students’ models of sampling and inference with nominal variables
- 2021
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Ingår i: Quadrante: Revista de Investigação em Educação Matemática. - Lisbon, Portugal : Associacao de Professores de Matematica. - 0872-3915 .- 2183-2838. ; 30:1, s. 158-177
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Tidskriftsartikel (refereegranskat)abstract
- Making inferences about unknown populations is central in statistical reasoning. However, little attention has been paid to empirical investigations of how and why students develop sampling models when investigating a categorical variable whose values are nominal. This paper reports on an intervention that draws on the models and modeling perspective, where 25 pre-service teachers were asked to develop a sampling model that could be used to make inferences about the number of different colored beads and the distribution of different colored beads in different sized populations. Using a thematic analysis, three main results about the characteristics of the students’ models of sampling and inference with nominal variables were identified: to catch all the low frequency colors in the population; not to overestimate the low frequency colors in the population; and, to formalize the relationships used in making inferences. These results highlight several issues about students’ understanding of the relationship between sample representativeness and sample variability and its consequences for making inferences.
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| 7. |
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| 8. |
- Bergman Ärlebäck, Jonas, 1972-, et al.
(författare)
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Modelling from the Perspective of Commognition – An emerging framework
- 2013
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Ingår i: Teaching mathematical modelling. - Dordrecht : Springer Netherlands. - 9789400765399 - 9789400765405 ; , s. 47-56
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Bokkapitel (refereegranskat)abstract
- This bookprovides readers with an overview of recent international research and developments in the teaching and learning of modelling and applications from a variety of theoretical and practical perspectives. There is a strong focus on pedagogical issues for teaching and learning of modelling as well as research into teaching and practice. The teaching of applications of mathematics and mathematical modelling from the early years through primary and secondary school and at tertiary level is rising in prominence in many parts of the world commensurate with an ever-increasing usage of mathematics in business, the environment, industry and everyday life. The authors are all members of the International Community of Teachers of Mathematical Modelling and Applications and important researchers in mathematics education and mathematics. The book will be of interest to teachers, practitioners and researchers in universities, polytechnics, teacher education, curriculum and policy.
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| 9. |
- Bergman Ärlebäck, Jonas, 1972-, et al.
(författare)
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On pre-service secondary teachers’ mathematical content knowledge in statistics
- 2021
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Ingår i: <em>Sustainable mathematics education in a digitalized world. </em>. - Göteborg : SMDF - Svensk Förening för Matematikdidaktisk Forskning. ; , s. 203-212
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- In this paper we report on the use of a pre-post-test design to study pre-service secondary mathematics teachers’ mathematical content knowledge in statistics before and after their first university course in statistics. The results show that the participants were successful in the pre-test on items related to sampling, probabi- lity and the general logic of making formal statistical inferences, but struggled with items concerning distributions. Comparing the pre- and post-test reveals an increas- ing average of the participants’ scores in most statistical areas, but that topics like informal statistical inferences and distributions remain challenging for the majority of the participants.
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