| 1491. |
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| 1492. |
- Nilsson, Emil, 1989-
(författare)
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Borehole Thermal Energy Storage Systems for Storage of Industrial Excess Heat : Performance Evaluation and Modelling
- 2020
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Improving industrial energy efficiency is considered an important factor in reducing carbon dioxide emissions and counteract climate change. For many industrial companies in cold climates, heat generated at the site in summer will not be needed to fulfil the site heat demand during this time, and is thus removed to the outdoor air. Although a mismatch between heat generation and heat demand primarily being seasonal, a mismatch may also exist at times in the winter, e.g. during milder winter days or high production hours. If this excess heat instead of being sent to the outdoors was stored for later use when it is needed, purchased energy for the site could be decreased. One way to do this is by the use of a borehole thermal energy storage (BTES) system.A BTES system stores energy directly in the ground by using an array of closely drilled boreholes through which a heat carrier, often water, is circulated. So far, BTES systems used for heating purposes have mainly been used for storage of solar thermal energy. The BTES system has then been part of smaller district solar heating systems to reduce the seasonal mismatch between incoming solar radiation and heat demand, thus increasing system solar fraction. For this application of BTES systems, energy for storage can be controlled by the sizing of the solar collector area. At an industrial site, however, the energy that can be stored will be limited to the excess heat at the site, and the possible presence of several time-varying processes generating heat at different temperatures gives options as to which processes to include in the heat recovery process and how to design the BTES system. Moreover, to determine the available heat for storage at an industrial site, individual measurements of the heat streams to be included are required. Thus, this must be made more site-specific as compared to that of the traditional usage of BTES systems where solar thermal energy is stored, in which case long-time historic solar radiation data to do this is readily accessible for most locations. Furthermore, for performance predictions of industrial BTES systems to be used for both seasonal and short-term storage of energy, models that can treat the short-term effects are needed, as traditional models for predicting BTES performance do not consider this.Although large-scale BTES systems have been around since the 1970’s, little data is to be found in the literature on how design parameters such as borehole spacing and borehole depth affect storage performance, especially for industrial BTES applications. Most studies that can be found with regard to the designing of ground heat exchanger systems are for traditional ground source heat pumps, working at the natural temperature of the ground and being limited to only one or a few boreholes.In this work, the performance of the first and largest industrial BTES system in Sweden was first presented and evaluated with regard to the storage’s first seven years in operation. The BTES system, which has been used for both long- and short-term storage of energy, was then modelled in the IDA ICE 4.8 environment with the aim to model actual storage performance. Finally, the model was used to conduct a parametric study on the BTES system, where e.g. the impact on storage performance from borehole spacing and characteristics of the storage supply flow at heat injection were investigated. From the performance evaluation it could be concluded that lower than estimated quantities and/or quality of the excess heat at the site, resulting in lower storage supply flow temperatures at heat injection, has hindered the storage from reaching temperatures necessary for significant amounts of energy to be extracted. Based on the repeating annual storage behavior seen for the last years of the evaluation period, a long-term annual heat extraction and ratio of energy extracted to energy injected of approximately 400 MWh/year and 20% respectively are likely.For the comparison of predicted and measured storage performance, which considered a period of three years, predicted values for total injected and extracted energy deviated from measured values by less than 1 and 3% respectively, and predicted and measured values for injected and extracted energy followed the same pattern throughout the period. Furthermore, the mean relative difference for the storage temperatures was 4%. A time-step analysis confirmed that the intermittent heat injection and extraction, occurring at intervals down to half a day, had been captured in the three-year validation. This as predictions would become erroneous when the time step exceeded the time at which these changes in storage operation occur.Main findings from the parametric study include that 1) for investigated supply flows at heat injection, a high temperature was more important than a high flow rate in order to achieve high annual heat extractions and that 2) annual heat extraction would rapidly reduce as the borehole spacing was decreased from the one yielding the highest annual heat extraction, whereas the reduction in annual heat extraction was quite slow when the spacing was increased from this point. Another conclusion that came from the performance evaluation and the parametric study, as a consequence of the Emmaboda storage being designed as a high-temperature BTES system, intended working temperatures being 40–55 °C, was that the possibility of designing the BTES system for low working temperatures should be considered in the designing of a BTES system. Lower storage operation temperatures allow for more energy to be injected and in turn for more energy to be extracted and reduces storage heat losses to the surroundings.
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| 1493. |
- Nilsson, Hans, et al.
(författare)
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Oxygen ion response to proton bursty bulk flows
- 2016
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Ingår i: Journal of Geophysical Research - Space Physics. - : American Geophysical Union (AGU). - 2169-9380 .- 2169-9402. ; 121:8, s. 7535-7546
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Tidskriftsartikel (refereegranskat)abstract
- We have used Cluster spacecraft data from the years 2001 to 2005 to study how oxygen ions respond to bursty bulk flows (BBFs) as identified from proton data. We here define bursty bulk flows as periods of proton perpendicular velocities more than 100 km/s and a peak perpendicular velocity in the structure of more than 200 km/s, observed in a region with plasma beta above 1 in the near-Earth central tail region. We find that during proton BBFs only a minor increase in the O+ velocity is seen. The different behavior of the two ion species is further shown by statistics of H+ and O+ flow also outside BBFs: For perpendicular earthward velocities of H+ above about 100 km/s, the O+ perpendicular velocity is consistently lower, most commonly being a few tens of kilometers per second earthward. In summary, O+ ions in the plasma sheet experience less acceleration than H+ ions and are not fully frozen in to the magnetic field. Therefore, H+ and O+ motion is decoupled, and O+ ions have a slower earthward motion. This is particularly clear during BBFs. This may add further to the increased relative abundance of O+ ions in the plasma sheet during magnetic storms. The data indicate that O+ is typically less accelerated in association with plasma sheet X lines as compared to H+.
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| 1494. |
- Nilsson, Hans, et al.
(författare)
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Projects accomplished by the Selective Fisheries Secretariat 2014-2017 : a synthesis report
- 2018
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Commissioned by the Swedish Agency for Marine and Water management, the Swedish University for Agricultural Sciences, established a Secretariat for selective fishing between 2014 and 2017. The secretariat main task has been to gather and evaluate ideas of new gears from the industry on how to minimize unwanted catches. The industry´s initiative and engagement are essential for the successful development of new ideas. All projects have followed the same work flow; a development of project ideas by science-industry collaboration, an industry lead development phase and finally scientific evaluation and reporting.Thirty-four projects have been completed between 2014 and 2017. The separate projects have been reported yearly123 (in Swedish). As there is also an apparent need to interact with similar initiatives in other countries and to disseminate to an international audience we here summarize all 34 projects according to the results of the scientific evaluations, their applicability given current fisheries regulations and fishing practises and also on the up-take of the new gears. The report is divided between active and passive gears and the different projects are grouped based on fisheries (gear type and target species). In the end of the report, fact sheets is included for the most relevant project.
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| 1495. |
- Nilsson, Hans, et al.
(författare)
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Syntesrapport av Sekretariatet för selektivt fiske 2014-2017
- 2018
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- På uppdrag av Havs- och vattenmyndigheten (HaV), som har ansvarat för regeringsuppdraget selektivt fiske, upprättade SLU Aqua ett Sekretariat för selektivt fiske mellan 2014 och 2017. Sekretariatets huvuduppgift har varit att samla in idéer tillsammans med näringen, för att stimulera utvecklingen av selektiva fiskemetoder i syfte att minska mängden oönskad fångst. Näringens initiativ och engagemang har varit helt avgörande för en framgångsrik utveckling av nya idéer. Under projektperioden har sekretariatet tillsammans med näringen drivit 34 projekt inom selektivt fiske. Samtliga projekt är vetenskapligt utvärderade och redovisade i årliga verksamhetsrapporter. I denna syntesrapport sammanställs resultaten från projekt med liknande problemställningar, målarter och fiskemetoder, till olika fisken. De olika fiskena är uppdelade mellan aktiva och passiva redskap. I sammanställningen har alla projekten bedömts efter en 5-gradig skala som sammanfattar resultatet av den vetenskapliga utvärderingen, redskapets tillämpbarhet i verkligt fiske samt behov av förvaltningsåtgärder och/eller andra incitament för att redskapen verkligen skall komma till bred användning i fisket.
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| 1496. |
- Nilsson, Jenny, et al.
(författare)
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Influence of age and sex on disease course and treatment in rheumatoid arthritis
- 2021
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Ingår i: Open Access Rheumatology: Research and Reviews. - 1179-156X. ; 13, s. 123-138
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Tidskriftsartikel (refereegranskat)abstract
- Objective: More than 50% of patients with rheumatoid arthritis (RA) are >65 years at diagnosis. Age of onset and sex may influence the disease course, outcome and treatment. This study follows a large cohort of patients with early RA to assess contributions of age and sex to disease outcomes. Methods: Patients from the BARFOT cohort, n=2837 (68% women), were followed for eight years at predefined time points to assess inflammation, function, joint destruction and treatment with disease modifying anti-rheumatic drugs (DMARDs) and glucocorticoids (GC). The patients were divided by sex and age at inclusion (<40, 40–54, 55–69 and ≥70 years). Results: For both sexes, disease activity, function and pain improved over time, significantly more in men than in women in all age groups. In men, those <40 years displayed significantly lower DAS28 compared with all other groups. This group was also the least represented group in the study. The Sharp van der Heijde Score (SHS) increased over time in both sexes and all age groups. Women ≥70 years showed less improvement in disability and the highest progression of SHS mainly due to increased joint space narrowing. Patients <40 years were more likely to receive biological DMARDs, while those ≥70 years more often received only GC treatment. Conclusion: There were significant age-and sex-dependent differences in the medical treatment and in outcome of RA 8 years after diagnosis. The differences were most pronounced in men<40 and women ≥70 years, but whether they are due to disease phenotype or treatment is unclear.
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| 1497. |
- Nilsson, Maria, 1980-, et al.
(författare)
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Ambient Assisted Living technology-mediated interventions for older people and their informal carers in the context of healthy ageing : A scoping review
- 2021
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Ingår i: Health Science Reports. - : John Wiley & Sons. - 2398-8835. ; 4:1
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Forskningsöversikt (refereegranskat)abstract
- Background and aims There is a growing demand for health and social care services to provide technology‐mediated interventions that promote the health and well‐being of older people with health or care needs and of their informal carers. The objectives of this study were to scope and review the nature and extent of prior intervention studies involving ambient assisted living technology‐mediated interventions for older people and their informal carers, and how and in what ways (if any) the goals and aims of these interventions reflected the domains of the World Health Organization framework for healthy ageing.Methods We conducted a scoping review. Data were collected between June and October 2018 with an updated search in October 2020. A total of 85 articles were eligible for inclusion.Results Nine categories described the aims and content of the included studies. The healthy ageing domain “Ability to meet basic needs” was mirrored in four categories, whereas “Ability to contribute to society” was not addressed at all.Conclusion The ways in which domains of healthy ageing are mirrored suggest that there is an emphasis on individual factors and individual responsibility, and a lack of attention given to broader, environmental factors affecting healthy ageing. Only a few of the studies used a dyadic approach when assessing health outcomes concerning older people and their informal carers.
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| 1498. |
- Nilsson, Maria, 1980-, et al.
(författare)
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Keeping the older population and their informal carers healthy and independent using digital technology : a discourse analysis of local policy
- 2024
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Ingår i: Ageing & Society. - : Cambridge University Press. - 0144-686X .- 1469-1779. ; 44:4, s. 812-842
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Tidskriftsartikel (refereegranskat)abstract
- The general discourse in health and social care policy purports digital technology as necessary to meet growing demands for long-term care and health care as a result of an ageing population. This needs critical investigation since public policy influences people's health and wellbeing. This study aims to interrogate critically what we call the ‘digital technology solution’ discourse in local Swedish health and social care policies. The main concern of our analysis is the discursive constructions of older people and their informal carers and how the concept of health is constructed. A discourse analysis was conducted of 61 local policy documents using the ‘What's the Problem Represented to Be’ method. Our analysis revealed that so-called ‘e-health strategies’ were rarely concerned with health. Health was often referred to as an activity and seen as a means to achieve independence among older people. The norm advocated independence, with the responsibility placed upon the older person, supported by digital technology. Informal carers were constructed as a resource within an older person's environment and largely taken for granted. We argue that the digital solution discourse ignores older people's agency and capacities as contributors to society, not least with regards to being providers of informal care.
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| 1499. |
- Nilsson, Maria Skyvell, 1961, et al.
(författare)
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Clinical Course Content As A Dynamic Variable In Supervision Of Medical Students
- 2010
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Ingår i: The Internet Journal of Medical Education. - 2155-6725. ; 1:2
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Tidskriftsartikel (refereegranskat)abstract
- BackgroundDuring clinical supervision, medical students are expected to gain experience through clinical work, with the support of their clinical supervisor. What each supervisor chooses to emphasize and considers important will have a decisive impact on students’ understanding of what is content necessary to master in order to gain clinical skills. Therefore, in this study, the focus of attention is on what supervisors choose to emphasise during clinical supervision of fourth year medical students during a surgical course. MethodAn ethnographic approach was used, including a selective intermittent time mode, where observation and informal interviews were conducted. Twelve supervisors and nine medical students at a teaching hospital in Sweden participated. Field notes were made during observation; these were transcribed and analysed qualitatively. ResultsThe analysis resulted in six topic areas describing what was emphasized during supervision. The topic areas were: 1) Identifying, collecting and combining information, 2) Problem-solving and decision-making, 3) Handling treatment of disease, 4) Practical skills and illustration of technical equipment, 5) Communicating with patients, and 6) Handling organisational demands.ConclusionsThe findings of this study show the existence of several areas that are focused on in supervision. In authentic clinical situations, these topic areas were intertwined and overlapped and often appeared simultaneously. The clinical situations were adjusted neither to the students’ clinical experience nor to the needs of the students. Consequently, the students may find it difficult to determine what to learn and what to achieve during supervision. They may also find it difficult to understand the situations in the same way as their supervisors, because students focus on handling situations with a more theoretical and declarative approach to a larger extent than do their supervisors. The students therefore need supervisor support to develop and integrate theoretical knowledge. One conclusion that can be made is that supervisor awareness of students’ understanding is of crucial significance for the effective supervision. Regarding the nature of the content chosen in supervised situations, research in other settings and specialties would be required to map and to determine a more general theory of what is focused during medical supervision.
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| 1500. |
- Nilsson, Maria Skyvell, 1961, et al.
(författare)
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Professional approaches in clinical judgements among senior and junior doctors: implications for medical education
- 2009
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Ingår i: BMC Medical Education. - 1472-6920. ; 9:25
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Tidskriftsartikel (refereegranskat)abstract
- Background: Clinical experience has traditionally been highly valued in medical education and clinical healthcare. On account of its multi-faceted nature, clinical experience is mostly difficult to articulate, and is mainly expressed in clinical situations as professional approaches. Due to retirement, hospitals in Scandinavia will soon face a substantial decrease in the number of senior specialist doctors, and it has been discussed whether healthcare will suffer an immense loss of experienced-based knowledge when this senior group leaves the organization. Both senior specialists and junior colleagues are often involved in clinical education, but the way in which these two groups vary in professional approaches and contributions to clinical education has not been so well described. Cognitive psychology has contributed to the understanding of how experience may influence professional approaches, but such studies have not included the effect of differences in position and responsibilities that junior and senior doctors hold in clinical healthcare. In the light of the discussion above, it is essential to describe the professional approaches of senior doctors in relation to those of their junior colleagues. This study therefore aims to describe and compare the professional approaches of junior and senior doctors when making clinical judgements. Methods: Critical incident technique was used in interviews with nine senior doctors and nine junior doctors in internal medicine. The interviews were subjected to qualitative content analysis. Result: Senior and junior doctors expressed a variety of professional approaches in clinical judgement as follows: use of theoretical knowledge, use of prior experience of cases and courses of events, use of ethical and moral values, meeting and communicating with the patient, focusing on available information, relying on their own ability, getting support and guidance from others and being directed by the organization. Conclusion: The most prominent varieties of professional approaches were seen in use of knowledge and work-related experience. Senior doctors know how the organization has worked in the past and have acquired techniques with respect to long-term decisions and their consequences. Junior doctors, on the other hand, have developed techniques and expertise for making decisions based on a restricted amount of information, in relation to patients' wellbeing as well as organizational opportunities and constraints. This study contributes to medical education by elucidating the variation in professional approaches among junior and senior doctors, which can be used as a basis for discussion about clinical judgement, in both pre-clinical and clinical education. Further research is required to explain how these professional approaches are expressed and used in clinical education.
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