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- Glasbey, JC, et al.
(författare)
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- 2021
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swepub:Mat__t
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| 4. |
- D'Amicis, R., et al.
(författare)
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First Solar Orbiter observation of the Alfvenic slow wind and identification of its solar source
- 2021
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 656
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Tidskriftsartikel (refereegranskat)abstract
- Context. Turbulence dominated by large-amplitude, nonlinear Alfven-like fluctuations mainly propagating away from the Sun is ubiquitous in high-speed solar wind streams. Recent studies have demontrated that slow wind streams may also show strong Alfvenic signatures, especially in the inner heliosphere.Aims. The present study focuses on the characterisation of an Alfvenic slow solar wind interval observed by Solar Orbiter between 14 and 18 July 2020 at a heliocentric distance of 0.64 AU.Methods. Our analysis is based on plasma moments and magnetic field measurements from the Solar Wind Analyser (SWA) and Magnetometer (MAG) instruments, respectively. We compared the behaviour of different parameters to characterise the stream in terms of the Alfvenic content and magnetic properties. We also performed a spectral analysis to highlight spectral features and waves signature using power spectral density and magnetic helicity spectrograms, respectively. Moreover, we reconstruct the Solar Orbiter magnetic connectivity to the solar sources both via a ballistic and a potential field source surface (PFSS) model.Results. The Alfvenic slow wind stream described in this paper resembles, in many respects, a fast wind stream. Indeed, at large scales, the time series of the speed profile shows a compression region, a main portion of the stream, and a rarefaction region, characterised by different features. Moreover, before the rarefaction region, we pinpoint several structures at different scales recalling the spaghetti-like flux-tube texture of the interplanetary magnetic field. Finally, we identify the connections between Solar Orbiter in situ measurements, tracing them down to coronal streamer and pseudostreamer configurations.Conclusions. The characterisation of the Alfvenic slow wind stream observed by Solar Orbiter and the identification of its solar source are extremely important aspects for improving the understanding of future observations of the same solar wind regime, especially as solar activity is increasing toward a maximum, where a higher incidence of this solar wind regime is expected.
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- Telloni, D., et al.
(författare)
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Study of two interacting interplanetary coronal mass ejections encountered by Solar Orbiter during its first perihelion passage Observations and modeling
- 2021
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 656
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Tidskriftsartikel (refereegranskat)abstract
- Context. Solar Orbiter, the new-generation mission dedicated to solar and heliospheric exploration, was successfully launched on February 10, 2020, 04:03 UTC from Cape Canaveral. During its first perihelion passage in June 2020, two successive interplanetary coronal mass ejections (ICMEs), propagating along the heliospheric current sheet (HCS), impacted the spacecraft.Aims. This paper addresses the investigation of the ICMEs encountered by Solar Orbiter on June 7-8, 2020, from both an observational and a modeling perspective. The aim is to provide a full description of those events, their mutual interaction, and their coupling with the ambient solar wind and the HCS.Methods. Data acquired by the MAG magnetometer, the Energetic Particle Detector suite, and the Radio and Plasma Waves instrument are used to provide information on the ICMEs' magnetic topology configuration, their magnetic connectivity to the Sun, and insights into the heliospheric plasma environment where they travel, respectively. On the modeling side, the Heliospheric Upwind eXtrapolation model, the 3D COronal Rope Ejection technique, and the EUropean Heliospheric FORecasting Information Asset (EUHFORIA) tool are used to complement Solar Orbiter observations of the ambient solar wind and ICMEs, and to simulate the evolution and interaction of the ejecta in the inner heliosphere, respectively.Results. Both data analysis and numerical simulations indicate that the passage of two distinct, dynamically and magnetically interacting (via magnetic reconnection processes) ICMEs at Solar Orbiter is a possible scenario, supported by the numerous similarities between EUHFORIA time series at Solar Orbiter and Solar Orbiter data.Conclusions. The combination of in situ measurements and numerical simulations (together with remote sensing observations of the corona and inner heliosphere) will significantly lead to a deeper understanding of the physical processes occurring during the CME-CME interaction.
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- Kononowicz, A. A., et al.
(författare)
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Virtual patient simulations for health professional education
- 2016
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Ingår i: Cochrane Database of Systematic Reviews. - : John Wiley & Sons. - 1469-493X .- 1469-493X. ; :5
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Forskningsöversikt (refereegranskat)abstract
- The objective of this review is to evaluate the effectiveness of virtual patient simulation as an educational intervention versus traditional learning, other types of e‐Learning interventions and other forms of virtual patient simulation interventions for delivering pre‐registration and post‐registration healthcare professional education. We will primarily assess the impact of these interventions on learners’ knowledge, skills and attitudes. Our secondary objective is to assess the cost‐effectiveness of these interventions.
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| 7. |
- Kononowicz, Andrzej A., et al.
(författare)
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Virtual Patient Simulations in Health Professions Education : Systematic Review and Meta-Analysis by the Digital Health Education Collaboration
- 2019
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Ingår i: Journal of Medical Internet Research. - : JMIR Publications. - 1438-8871. ; 21:7
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Forskningsöversikt (refereegranskat)abstract
- Background: Virtual patients are interactive digital simulations of clinical scenarios for the purpose of health professions education. There is no current collated evidence on the effectiveness of this form of education.Objective: The goal of this study was to evaluate the effectiveness of virtual patients compared with traditional education, blended with traditional education, compared with other types of digital education, and design variants of virtual patients in health professions education. The outcomes of interest were knowledge, skills, attitudes, and satisfaction.Methods: We performed a systematic review on the effectiveness of virtual patient simulations in pre- and postregistration health professions education following Cochrane methodology. We searched 7 databases from the year 1990 up to September 2018. No language restrictions were applied. We included randomized controlled trials and cluster randomized trials. We independently selected studies, extracted data, and assessed risk of bias and then compared the information in pairs. We contacted study authors for additional information if necessary. All pooled analyses were based on random-effects models.Results: A total of 51 trials involving 4696 participants met our inclusion criteria. Furthermore, 25 studies compared virtual patients with traditional education, 11 studies investigated virtual patients as blended learning, 5 studies compared virtual patients with different forms of digital education, and 10 studies compared different design variants. The pooled analysis of studies comparing the effect of virtual patients to traditional education showed similar results for knowledge (standardized mean difference [SMD]=0.11, 95% CI -0.17 to 0.39, I-2=74%, n=927) and favored virtual patients for skills (SMD=0.90, 95% CI 0.49 to 1.32, I-2=88%, n=897). Studies measuring attitudes and satisfaction predominantly used surveys with item-by-item comparison. Trials comparing virtual patients with different forms of digital education and design variants were not numerous enough to give clear recommendations. Several methodological limitations in the included studies and heterogeneity contributed to a generally low quality of evidence.Conclusions: Low to modest and mixed evidence suggests that when compared with traditional education, virtual patients can more effectively improve skills, and at least as effectively improve knowledge. The skills that improved were clinical reasoning, procedural skills, and a mix of procedural and team skills. We found evidence of effectiveness in both high-income and low-and middle-income countries, demonstrating the global applicability of virtual patients. Further research should explore the utility of different design variants of virtual patients.
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- Matteini, L., et al.
(författare)
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Solar Orbiter's encounter with the tail of comet C/2019 Y4 (ATLAS) : Magnetic field draping and cometary pick-up ion waves
- 2021
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 656
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Tidskriftsartikel (refereegranskat)abstract
- Context. Solar Orbiter is expected to have flown close to the tail of comet C/2019 Y4 (ATLAS) during the spacecraft’s first perihelion in June 2020. Models predict a possible crossing of the comet tails by the spacecraft at a distance from the Sun of approximately 0.5 AU.Aims. This study is aimed at identifying possible signatures of the interaction of the solar wind plasma with material released by comet ATLAS, including the detection of draped magnetic field as well as the presence of cometary pick-up ions and of ion-scale waves excited by associated instabilities. This encounter provides us with the first opportunity of addressing such dynamics in the inner Heliosphere and improving our understanding of the plasma interaction between comets and the solar wind.Methods. We analysed data from all in situ instruments on board Solar Orbiter and compared their independent measurements in order to identify and characterize the nature of structures and waves observed in the plasma when the encounter was predicted.Results. We identified a magnetic field structure observed at the start of 4 June, associated with a full magnetic reversal, a local deceleration of the flow and large plasma density, and enhanced dust and energetic ions events. The cross-comparison of all these observations support a possible cometary origin for this structure and suggests the presence of magnetic field draping around some low-field and high-density object. Inside and around this large scale structure, several ion-scale wave-forms are detected that are consistent with small-scale waves and structures generated by cometary pick-up ion instabilities.Conclusions. Solar Orbiter measurements are consistent with the crossing through a magnetic and plasma structure of cometary origin embedded in the ambient solar wind. We suggest that this corresponds to the magnetotail of one of the fragments of comet ATLAS or to a portion of the tail that was previously disconnected and advected past the spacecraft by the solar wind.
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| 9. |
- Telloni, Daniele, et al.
(författare)
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Exploring the Solar Wind from Its Source on the Corona into the Inner Heliosphere during the First Solar Orbiter-Parker Solar Probe Quadrature
- 2021
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Ingår i: Astrophysical Journal Letters. - : Institute of Physics Publishing (IOPP). - 2041-8205 .- 2041-8213. ; 920:1
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Tidskriftsartikel (refereegranskat)abstract
- This Letter addresses the first Solar Orbiter (SO)-Parker Solar Probe (PSP) quadrature, occurring on 2021 January 18 to investigate the evolution of solar wind from the extended corona to the inner heliosphere. Assuming ballistic propagation, the same plasma volume observed remotely in the corona at altitudes between 3.5 and 6.3 solar radii above the solar limb with the Metis coronagraph on SO can be tracked to PSP, orbiting at 0.1 au, thus allowing the local properties of the solar wind to be linked to the coronal source region from where it originated. Thanks to the close approach of PSP to the Sun and the simultaneous Metis observation of the solar corona, the flow-aligned magnetic field and the bulk kinetic energy flux density can be empirically inferred along the coronal current sheet with an unprecedented accuracy, allowing in particular estimation of the Alfven radius at 8.7 solar radii during the time of this event. This is thus the very first study of the same solar wind plasma as it expands from the sub-Alfvenic solar corona to just above the Alfven surface.
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| 10. |
- Woodham, Luke A
(författare)
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Exploring the impact of virtual patient design : medical students' small group learning around medical error
- 2020
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Background: The demands on medical and healthcare practitioners are continuously changing, with new technologies, treatments and regulatory guidelines emerging each year. One such example is increased focus on the impact of medical error, which although difficult to measure is generally acknowledged to be responsible for significant numbers of patient harms each year. As a consequence, the provision of education and training must adapt to reflect this, providing learners with an updated range of skills that can meet the needs of their profession. An increase in the use of technology has been one way that educators have sought to achieve this, along with developing pedagogies and approaches such as problem-based learning which better reflect the challenges faced by medicine and healthcare professionals. Virtual patients are interactive simulations of clinical scenarios that have been shown to be well-suited to the development of clinical reasoning skills. They have been widely used in medicine and healthcare training, although they have yet to be fully adopted across the sector. Virtual patients can vary significantly in their design and their use within activities. To date there is a lack of knowledge about the ways different design features of virtual patients can be optimally applied to benefit student learning. Aim: The aim of this thesis is to increase knowledge of how virtual patient design impacts upon undergraduate medical student learning, particularly when targeting medical error education in small-group teaching. Methods: The four studies in this thesis explore design features of virtual patients and how they impact upon different aspects of the student learning experience. Study I investigated the impact of including video elements within a virtual patient used to support a problem-based learning tutorial. Mixed methods were used to capture aspects of both student and tutor experiences, and a thematic analysis was undertaken to identify themes in the unstructured responses. Studies II-IV each explored different outcomes around the use of decision-making elements in virtual patients designed to develop awareness of medical errors. A series of six virtual patients were delivered to undergraduate medical students undertaking paediatric placements across six institutions as part of small-group teaching. Students were allocated to one of two virtual patient designs: a branched design that allowed students to make decisions, or a linear design which followed a pre-determined structure without scope for student decision-making. In study II, following the completion of all virtual patients, students completed a survey instrument designed to measure aspects of their motivation and learning strategies. Comparisons between the branched and linear groups were made to establish the impact of the virtual patient design. Study III used log-linear analysis to explore learner performance in a single-best answer assessment and included an additional group of students who received traditional lecture-based teaching. In the assessment, questions were categorised in one of 3 groups; directly related to decision points in the virtual patient cases, in the same area of management but relating to different decisions and options, and in the same broad area of medicine but different areas of patient management. Study IV compared the self-efficacy and other related factors between students who received the branched and linear virtual patients, and asked participants to complete a survey instrument directly after each virtual patient case. A regression analysis was performed to explore how different factors impacted upon the self-efficacy of students. Results: In study I we identified eight distinct themes relating to the use of video elements. One theme related to levels of engagement, with some participants finding the use of video to be beneficial and others preferring text. Some participants identified that the use of video slowed the pace of the tutorial but was well suited to providing information about procedures. In study II we demonstrated that the use of linear or branched structures for virtual patients had no consistent impact upon the measures of learner motivation and learning strategies. Similarly, in study IV our findings showed that the use of a linear or branched design did not impact upon learner self-efficacy. However, in study III we showed that both virtual patient design and institution had an impact on student learning, and these were retained in our final model. A branching design for virtual patients improved student learning around the decision points in the virtual patient cases. Students performed equally well in the questions regarding the same management approaches but different decisions regardless of whether they received the linear or branched interventions, and scored higher than those that received traditional teaching. There was no difference between any of the groups in the questions that related to different areas of patient management. Conclusions: Overall, our findings suggest that the use of a branched virtual patient design is able to improve student learning around medical error when used in small-group teaching, and is not associated with any impact on learner motivation or self-efficacy. Our studies have not provided any evidence that this learning transfers to other areas of medicine. These findings have been broadly repeated at six institutions, demonstrating that despite evidence of the strong impact of institutional culture on our results, the findings can be generalised to multiple settings. We conclude that educators should seek to design virtual patients which allow learners to rehearse key patient management decisions, supported by video in areas where this can be most beneficial, such as demonstrating procedures. These virtual patients should be embedded in broader learning activities that encourage learners to identify deeper features within the learning, with a view to transferring that learning to other areas of patient management.
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