| 1. |
- Aitomäki, Yvonne, et al.
(author)
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Light scattering in cellulose nanofibre suspensions : Model and experiments
- 2016
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In: Computers in Chemistry Proceeding from ACS National Meeting San Diego. - : American Chemical Society (ACS). ; , s. 122-
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Conference paper (other academic/artistic)abstract
- Here light scattering theory is used to assess the size distribution in a suspension of cellulose as it is fibrillated from micro-scaled to nano-scaled fibres. A model based on Monte carlo simulations of the scattering of photons by different sizes of cellulose fibres was used to predict the UV-IF spectrum of the suspensions. Bleached cellulose hardwood pulp was tested and compared to the visually transparent tempo-oxidised hardwood cellulose nanofibres (CNF) suspension. The theoretical results show that different diameter size classes exhibit very different scattering patterns. These classes could be identified in the experimental results and used to establish the size class dominating the suspension. A comparison to AFM/microscope size distribution was made and the results indicated that using the UV-IF light scattering spectrum maybe more reliable that size distribution measurement using AFM and microscopy on dried CNF samples. The UV-IF spectrum measurement combined with the theoretical prediction can be used even at this initial stage of development of this model to assess the degree of fibrillation when processing CNF.
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| 2. |
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| 3. |
- Arnbjörnsson, Einar, et al.
(author)
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Closure after gastrostomy button
- 2005
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In: Pediatric Surgery International. - : Springer Science and Business Media LLC. - 1437-9813 .- 0179-0358. ; 21:10, s. 797-799
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Journal article (peer-reviewed)abstract
- A gastrostomy device is removed from the gastrostoma when no longer needed. The aim of the study was to test the hypothesis of whether it is possible for the surgeon to decide which stoma has to be closed with a gastroraphy and which to leave for a spontaneous closure within a reasonable period of time. Out of a cohort of 321 patients, who had been operated with a video-assisted gastrostomy, we included all the 48 patients having had their gastrostomy button removed. These patients were carefully followed and the closure of the gastrostoma was registered. According to the institutional routine we waited at least 3 months after the removal of the gastrostomy device before suggesting to the child's guardians an operative closure of the stoma. In 26 patients the stoma closed within 3 months, whereas in 22 patients a surgical gastroraphy was performed. We found no differences between the two groups regarding the patients' diagnoses, the duration of the gastrostoma use or patient's age at the time of removal of the gastrostomy device. This study rejected the hypothesis of predictability of the gastrostoma closure. Thus, we recommend a routine expectance after the removal of a gastrostomy device for at least 1 month. If no spontaneous closure occurs, then a gastroraphy should be performed.
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| 4. |
- Axelsson, Karin, 1969-
(author)
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Entrepreneurship in a School Setting : Introducing a Business Concept in a Public Context
- 2017
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Doctoral thesis (other academic/artistic)abstract
- Entrepreneurship has during the last decades gained an immense interest in academia, politics and practice. It is argued from politics that more entrepreneurs are necessary for the economic development. In addition, nowadays entrepreneurship is also perceived as a solution to social and societal challenges. This drives a need for entrepreneurial people everywhere in society who can cope with the inconstant and uncertain world of today. As a consequence, there are around the world numerous educational initiatives trying to inspire and fuel an entrepreneurial mind-set. Here, educations of all kind become relevant contexts since they provide an opportunity to affect children, youth’s and adult’s interest and attitudes towards entrepreneurship, and as such give a possibility to reach a vast number of people.Sweden is no exception, and in 2009 the Swedish Government launched a ‘Strategy for entrepreneurship in the field of education’ in which entrepreneurship is said to run like a common thread throughout education. The main focus is that self-employment is to become as natural as being an employee. As such the Government took an active stand for implementing entrepreneurship in the school setting on a broad front, from preschool to adult education.This development can be seen as part of New Public Management; a development where concepts from the private sector are lent and transferred to the public sector. Thus, when introducing entrepreneurship in the Swedish educational system, this at the same time means introducing a traditional business concept in a public setting. Therefore, the overall aim of this thesis is to increase knowledge of and insights on how a business concept – entrepreneurship – is operationalised and constructed in a public setting.When placing entrepreneurship in new societal contexts other questions arise and complexity intensifies. In this qualitative research, the empirical context in focus are schools. It investigates how entrepreneurship is constructed among teachers in their work. But also how this business concept is included in a non-business setting by studying how the entrepreneurship strategy is operationalised in educational practice.As such the thesis and its findings contribute to the scientific discussions on societal entrepreneurship and entrepreneurship education, as well as on strategy and strategising in a public context. The research also aspire to serve inspiration, insights and food for thoughts on discussions and reflections on entrepreneurship within the school practice. This compilation thesis include five papers. To be able to fulfil the aim this research use a broad theoretical base and multiple qualitative research methods. The combination of methods include semi-structured interviews, in-depth interview using the stimulated recall method, focus group interviews, participative meetings, observations, document studies, digital questionnaires, written inquiries, analysing texts and critical incidents questionnaires.
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| 5. |
- Axelsson, Karin, PhD, 1969-, et al.
(author)
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Improving Quality in Higher Education by using Living Lab Methods
- 2019
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In: The OpenLivingLab Days Conference 2019.. - Brussels, Belgium : enoll.org. - 9789082102796 ; , s. 394-406
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Conference paper (peer-reviewed)abstract
- This conceptual paper presents a Living Lab model of how university, society and organisation may strengthen the co-creation capacity on regional and international level to improve quality in higher education. Our conclusions are that successful co-creation between universities and society/organizations is built on mutual contribution, knowledge sharing as well as engagement from all involved. Here, living lab methods can help improve quality. Further, from a university perspective, a challenge is to keep the engagement in the project from all involved, and to assure an equal status between stakeholders. This calls for a skill in how to conduct project in co-creation with several partners. A skill that has to be taught to students as well as to teachers and researchers.
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| 6. |
- Backman, Torbjörn, et al.
(author)
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Complications of video-assisted gastrostomy in children with or without a ventriculoperitoneal shunt
- 2007
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In: Pediatric Surgery International. - : Springer Science and Business Media LLC. - 1437-9813 .- 0179-0358. ; 23:7, s. 665-668
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Journal article (peer-reviewed)abstract
- The aim of the study was to test the hypothesis that the presence of a ventriculoperitoneal shunt ( VPS) influences the frequency of postoperative complications after video-assisted gastrostomy ( VAG) in children. When using a power of 80%, a critical value for significance of 5% and an assumed population-based standard deviation of 0.4, it will be required to have a sample size of at least 14 children to show that a difference of 0.6 is significant when using Student's t test for paired samples. Thus, 15 consecutive children with VPSs were included in the present study. All the children had nutritional problems and underwent a VAG operation at a tertiary care university hospital. After the operation, the children were prospectively followed up. Specially trained nurses documented all complications according to a protocol. For the purpose of comparison, we had a control group of neurologically disabled children without VPSs, matched for age and operated with VAG. The children did not present with any serious postoperative intra-abdominal complications or central nervous system infection. There was no significant difference in the frequency of minor complications between the studied group and the control group. This study did not reveal that children with VPSs who undergo a VAG button placement are at high risk for infection and subsequent shunt malfunction. They did not have more postoperative problems than a matched control group of neurologically disabled children.
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| 7. |
- Backman, Torbjorn, et al.
(author)
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Video-assisted gastrostomy in infants less than 1 year.
- 2006
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In: Pediatric Surgery International. - : Springer Science and Business Media LLC. - 1437-9813 .- 0179-0358. ; 22:3, s. 243-246
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Journal article (peer-reviewed)abstract
- The objectives of this study were to report our experience with the laparoscopic video-assisted gastrostomy technique in infants operated during their first year of life. A total of 53 infants (35 males, 18 females) aged 6 +/- 3 months, varying from 3 weeks to 11 months, underwent video-assisted gastrostomy. They were prospectively followed up. Included are infants with neurological dysfunction, chromosomal anomalies, metabolic disorders, cardiac anomalies or respiratory insufficiency. All the infants were operated under general and local anaesthesia. Gastrostomy tube feeding began within 4 h after the operation. The infants were followed with a scheduled control at 1 and 6 months postoperatively documenting complications and weight gain. The main outcome measure was the number and type of complications as well as weight gain using the age-adjusted Z-score of weight to normalize the data relative to a reference population. The weight before and 6 months after the video-assisted gastrostomy was 5.5 +/- 1.6 and 8.5 +/- 1.6 kg, respectively. The Z-score increased significantly (P < 0.001) from -2.7 +/- 1.5 to -1.7 +/- 1.0. This illustrates the postoperative weight gain and catch-up. Short and long-term complications included minor local wound infection, leakage around the gastrostomy tube and granuloma, but no severe complications. Our results encourage the use of video-assisted gastrostomy as a safe technique to provide a route for long-term nutritional support even in infants less than 1 year.
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| 8. |
- Bamia, Christina, et al.
(author)
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Dietary patterns and survival of older Europeans : the EPIC-Elderly Study (European Prospective Investigation into Cancer and Nutrition)
- 2007
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In: Public Health Nutrition. - : Cambridge University Press. - 1368-9800 .- 1475-2727. ; 10:6, s. 590-598
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Journal article (peer-reviewed)abstract
- Objective: To investigate the association of a posteriori dietary patterns with overall survival of older Europeans.Design and setting: This is a multi-centre cohort study. Cox regression analysis was used to investigate the association of the prevailing, a posteriori-derived, plant-based dietary pattern with all-cause mortality in a population of subjects who were 60 years or older at recruitment to the European Prospective Investigation into Cancer and Nutrition (EPIC-Elderly cohort). Analyses controlled for all known potential risk factors.Subjects: In total, 74 607 men and women, 60 years or older at enrolment and without previous coronary heart disease, stroke or cancer, with complete information about dietary intakes and potentially confounding variables, and with known survival status as of December 2003, were included in the analysis.Results: An increase in the score which measures the adherence to the plant-based diet was associated with a lower overall mortality, a one standard deviation increment corresponding to a statistically significant reduction of 14% (95% confidence interval 5–23%). In country-specific analyses the apparent association was stronger in Greece, Spain, Denmark and The Netherlands, and absent in the UK and Germany.Conclusions: Greater adherence to the plant-based diet that was defined a posteriori in this population of European elders is associated with lower all-cause mortality. This dietary score is moderately positively correlated with the Modified Mediterranean Diet Score that has been constructed a priori and was also shown to be beneficial for the survival of the same EPIC-Elderly cohort.
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| 9. |
- Berglund, Linn, et al.
(author)
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Production potential of cellulose nanofibers from industrial residues : Efficiency and nanofiber characteristics
- 2016
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In: Industrial crops and products (Print). - : Elsevier BV. - 0926-6690 .- 1872-633X. ; 92, s. 84-92
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Journal article (peer-reviewed)abstract
- The aim of this study was to evaluate the production potential of cellulose nanofibers from two different industrial bio-residues: wastes from the juice industry (carrot) and the beer brewing process (BSG). The mechanical separation of the cellulose nanofibers was by ultrafine grinding. X-ray diffraction (XRD) and Raman spectroscopy revealed that the materials were mechanically isolated without significantly affecting their crystallinity. The carrot residue was more easily bleached and consumed less energy during grinding, using only 0.9 kWh/kg compared to 21 kWh/kg for the BSG. The carrot residue also had a 10% higher yield than the BSG. Moreover, the dried nanofiber networks showed high mechanical properties, with an average modulus and strength of 12.9 GPa and 210 MPa, respectively, thus indicating a homogeneous nanosize distribution. The study showed that carrot residue has great potential for the industrial production of cellulose nanofibers due to its high quality, processing efficiency, and low raw material cost
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| 10. |
- Berglund, Linn, et al.
(author)
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Switchable ionic liquids enable efficient nanofibrillation of wood pulp
- 2017
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In: Cellulose. - : Springer Science and Business Media LLC. - 0969-0239 .- 1572-882X. ; 24:8, s. 3265-3279
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Journal article (peer-reviewed)abstract
- Use of switchable ionic liquid (SIL) pulp offers an efficient and greener technology to produce nanofibers via ultrafine grinding. In this study, we demonstrate that SIL pulp opens up a mechanically efficient route to the nanofibrillation of wood pulp, thus providing both a low cost and chemically benign route to the production of cellulose nanofibers. The degree of fibrillation during the process was evaluated by viscosity and optical microscopy of SIL treated, bleached SIL treated and a reference pulp. Furthermore, films were prepared from the fibrillated material for characterization and tensile testing. It was observed that substantially improved mechanical properties were attained as a result of the grinding process, thus signifying nanofibrillation. Both SIL treated and bleached SIL treated pulps were fibrillated into nanofibers with fiber diameters below 15 nm thus forming networks of hydrophilic nature with an intact crystalline structure. Notably, it was found that the SIL pulp could be fibrillated more efficiently than traditional pulp since nanofibers could be produced with more than 30% less energy when compared to the reference pulp. Additionally, bleaching reduced the energy demand by further 16%. The study demonstrated that this switchable ionic liquid treatment has considerable potential in the commercial production of nanofibers due to the increased efficiency in fibrillation.
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