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| 4. |
- Bjerner, Tomas, et al.
(author)
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Evaluation of nonperfused myocardial ischemia with MRI and an intravascular USPIO contrast agent in an ex vivo pig model
- 2000
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In: Journal of Magnetic Resonance Imaging. - 1053-1807 .- 1522-2586. ; 12:6, s. 866-872
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Journal article (peer-reviewed)abstract
- The ultrasmall superparamagnetic iron oxide (USPIO) preparation NC100150 Injection (Clariscan; Nycomed Imaging, Oslo, Norway) was tested for its ability to delineate nonperfused myocardium under steady-state conditions. An experimental animal model of focal myocardial ischemia induced by ligation of the distal part of the left anterior descending artery was used. The contrast agent was administered in four doses: 0, 4, 8, and 12 mg Fe/kg body weight. Magnetic resonance examination ex vivo, including T1-, T2-, and T2*-weighted sequences, was performed. Nonperfused myocardium was determined by fluorescein. The best delineation of nonperfused myocardium was found with a T1-weighted inversion recovery/turbo spin-echo sequence and doses of 4 and 8 mg Fe/kg body weight, where 95% of the volume was discernible at the dose of 4 mg Fe/kg body weight. The results suggest that steady-state imaging by T1-weighted sequence with the use of NC100150 Injection to delineate nonperfused myocardium is feasible. J. Magn. Reson. Imaging 2000;12:866-872.
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| 5. |
- Bjerner, Tomas, et al.
(author)
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First-Pass Myocardial Perfusion MR Imaging with Outer-Volume Suppression and the Intravascular Contrast Agent NC100150 Injection : Preliminary Results in Eight Patients.
- 2001
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In: Radiology. - : Radiological Society of North America (RSNA). - 0033-8419 .- 1527-1315. ; 221:3, s. 822-826
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Journal article (peer-reviewed)abstract
- The authors evaluated the feasibility of combining single-shot T2-weighted turbo spin-echo magnetic resonance (MR) imaging and first-pass myocardial perfusion MR imaging with an intravascular ultrasmall superparamagnetic iron oxide (USPIO) contrast agent, NC100150 Injection (3 mg of iron per kilogram of body weight). Eight patients with coronary vessel disease underwent T2-weighted turbo spin-echo MR imaging (in-plane resolution, 1-2 mm) during the first pass of the USPIO contrast agent. The mean decrease in signal intensity in myocardium perfused by a nonstenotic coronary artery was 59% +/- 13 (SD) (P < .012) This method is feasible for imaging of myocardial perfusion.
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| 7. |
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| 8. |
- Wang, Chen, et al.
(author)
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Dysprosium-enhanced MR imaging for tumor tissue characterization : an experimental study in a human xenograft model
- 1997
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In: Acta Radiologica. - 0284-1851 .- 1600-0455. ; 38:2, s. 281-286
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Journal article (peer-reviewed)abstract
- PURPOSE: To evaluate dysprosium-enhanced MR imaging for differentiation between morphologically intact and necrotic tumor tissue in a tumor model. MATERIAL AND METHODS: A human colon carcinoma was transplanted subcutaneously into 9 nude (immunodeprived) rats. MR imaging was performed before and after injection of the dysprosium agent Dy-DTPA-BMA. T1-, T2- and T2*-weighted sequences were acquired. The tumors were dissected, histological sections were prepared, and compared with corresponding MR images. RESULTS: In intact tissue, the MR signal intensity in the T2- and T2*-weighted images decreased after Dy injection and the delineation of the intact regions were sharp and corresponded well to the gross histological sections. CONCLUSION: Dy-enhanced MR imaging facilitated the differentiation between intact and necrotic tumor tissue.
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| 11. |
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| 12. |
- Weis, Jan, et al.
(author)
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Spectroscopic imaging of bone marrow composition in vertebral bodies
- 2001
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In: Magnetic Resonance Materials in Physics, Biology and Medicine. - 0968-5243 .- 1352-8661. ; 13:1, s. 15-18
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Journal article (peer-reviewed)abstract
- The proton spectroscopic imaging technique that uses read gradient during acquisition was used for the measurement of the proton spectra in the lumbar and thoracic part of the spine of a patient with breast cancer without known skeletal metastases. The bone marrow fat/water ratios were evaluated in the same location before and after chemotherapy treatment. The results were corrected for relaxation effects. The fat/water ratios showed a significant increase as a consequence of the bone marrow degradation process due to chemotherapy. The proposed spectroscopic imaging technique offers rapid acquisition of proton spectra from large volumes of the vertebral bodies.
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| 13. |
- Borell, Lena, et al.
(author)
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Qualitative approaches in occupational therapy research
- 2014
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In: Scandinavian Journal of Occupational Therapy. - : Informa UK Limited. - 1103-8128 .- 1651-2014. ; 21, s. 80-88
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Journal article (peer-reviewed)abstract
- Objective: Development of research in occupational therapy requires a continuous critical discussion concerning methodological approaches. In this paper the authors wish to contribute to such a discussion by introducing the Formal Data-Structure Analysis approach (FDSA) as a method for understanding people's experiences. Methods and results: A review of selected publications from occupational therapy journals between 2003 and 2005 illustrated that qualitative articles within occupational therapy publications were mainly descriptive in nature. This finding raises questions about how to develop new knowledge that contributes to occupational therapy. Conclusions: In this paper the authors suggest that it is possible to apply the FDSA approach not only when describing and categorizing qualitative phenomena, but also when aiming to reach an in-depth understanding of issues related to human meaning-making; for example, how we understand engagement in occupations or living with a disability. Examples of the application of the FDSA approach are included and discussed.
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| 14. |
- Borell, Lena, et al.
(author)
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Qualitative approaches in occupational therapy research
- 2012
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In: Scandinavian Journal of Occupational Therapy. - : Informa UK Limited. - 1103-8128 .- 1651-2014. ; 19:6, s. 521-529
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Journal article (peer-reviewed)abstract
- Objective: Development of research in occupational therapy requires a continuous critical discussion concerning methodological approaches. In this paper the authors wish to contribute to such a discussion by introducing the Formal Data-Structure Analysis approach (FDSA) as a method for understanding people's experiences. Methods and results: A review of selected publications from occupational therapy journals between 2003 and 2005 illustrated that qualitative articles within occupational therapy publications were mainly descriptive in nature. This finding raises questions about how to develop new knowledge that contributes to occupational therapy. Conclusions: In this paper the authors suggest that it is possible to apply the FDSA approach not only when describing and categorizing qualitative phenomena, but also when aiming to reach an in-depth understanding of issues related to human meaning-making; for example, how we understand engagement in occupations or living with a disability. Examples of the application of the FDSA approach are included and discussed.
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| 15. |
- Di, Mengqiao, 1994, et al.
(author)
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Chasing PtO x species in ceria supported platinum during CO oxidation extinction with correlative operando spectroscopic techniques
- 2022
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In: Journal of Catalysis. - : Elsevier BV. - 0021-9517 .- 1090-2694. ; 409, s. 1-11
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Journal article (peer-reviewed)abstract
- Industrially relevant, highly dispersed, Pt/ceria and reference Pt/alumina catalysts with narrow Pt particle size distributions have been prepared, characterised ex situ and studied for CO oxidation by operando infrared and X-ray absorption spectroscopy. At high CO conversions, spectator CO ad-species on ionic platinum are observed while the CO oxidation proceeds on Pt particles in a high oxidation state exhibiting significant Pt[sbnd]O coordination. During the protracted catalytic extinction, the CO coverage builds up gradually while the Pt oxidation state and Pt[sbnd]O coordination remain high because of interactions with ceria. The observed CO oxidation at high CO coverage is suggested to involve sites at the platinum-ceria boundary that cannot be CO self-poisoned. This behaviour is in stark contrast to that of Pt/alumina, which shows removal of platinum oxides formed during CO oxidation and the classical drop in catalytic activity caused by rapid CO self-poisoning when reaching a critical temperature.
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| 16. |
- Di, Mengqiao, 1994, et al.
(author)
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Why nitrogen oxide inhibits CO oxidation over highly dispersed platinum ceria catalysts
- 2024
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In: Catalysis Today. - 0920-5861. ; 426
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Journal article (peer-reviewed)abstract
- The influence of nitrogen oxide on the lean CO oxidation activity of highly dispersed Pt/ceria and reference Pt/alumina catalysts has been studied by kinetic measurements and infrared spectroscopic characterization. Co-feeding of nitrogen oxide leads to the formation of nitrates on the supports that induce a highly oxidized character of the Pt sites and in the case of Pt/ceria, inhibit ceria lattice oxygens to react with CO adsorbed on Pt rim sites via a Mars-van Krevelen mechanism below the ignition temperature. The build-up of nitrates below the light-off temperatures is faster when CO is present in the feed. Above the light-off temperatures, carbonates replace the nitrates while the catalytic activity remains high.
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| 17. |
- Dolva, Anne-Stine, et al.
(author)
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Facilitating peer interaction - support to children with Down syndrome in mainstream schools
- 2011
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In: European Journal of Special Needs Education. - : Informa UK Limited. - 0885-6257 .- 1469-591X. ; 26:2, s. 201-213
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Journal article (peer-reviewed)abstract
- This study addresses the support provided by class staff in order to facilitate social participation of pupils with Down syndrome and peers in regular classes, and how they experience the interaction between the pupils. Data were collected through field observations of six pupils with Down syndrome in their class in mainstream schools, their six teachers and teachers’ assistants. Qualitative interviews were conducted with the teachers and teachers’ assistants. The analysis showed different support strategies, implying both environmental adaptations and individual support in order to facilitate peer interaction. A major finding was the role of the ‘supported ego’, mainly provided by teachers’ assistants. This role accommodated to the differences between the pupils, by compensating for the cognitive difficulties (i.e., perceptions, understanding and agency) of the pupils with Down syndrome. We concluded that class staff strived to keep the class as one unit by creating opportunities for participation for all the pupils through different strategies depending on their role and responsibility.
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| 18. |
- Dreber, Helena, et al.
(author)
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Health-Related Quality of Life 5 Years After Roux-en-Y Gastric Bypass in Young (18-25 Years) Versus Older (≥ 26 Years) Adults : a Scandinavian Obesity Surgery Registry Study.
- 2019
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In: Obesity Surgery. - : Springer. - 0960-8923 .- 1708-0428. ; 29:2, s. 434-443
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Journal article (peer-reviewed)abstract
- BACKGROUND: To compare changes in health-related quality of life (HRQoL) in young (18-25 years) versus older (≥ 26 years) adults up to 5 years after Roux-en-Y gastric bypass (RYGB).METHODS: Data on Short Form-36 (SF-36) and obesity-related problems scale (OP) at baseline and 1, 2, and 5 years after RYGB were extracted from the Scandinavian Obesity Surgery Registry. Within-group changes and the effect of age group on 5-year changes in SF-36 and OP were analyzed. Effects sizes (ESs) were calculated.RESULTS: A total of 2542 young and 12,425 older adults were included at baseline, and 138 young (20.7% of those eligible) and 1021 older (31.8%) adults were followed-up 5 years post-RYGB. At this time, average to large improvements (ES ≥ 0.5) were observed in physical functioning, physical component score and OP in young adults, and in physical functioning, role physical, general health, physical component score, and OP in older adults (all, p ≤ 0.001). Both age groups displayed negligible to weak (ES < 0.5) or no improvements in mental HRQoL (all, p < 0.55). Older adults displayed greater 5-year improvements than their young counterparts in role physical, general health, vitality, social functioning, physical component score, and obesity-related problems scale (all, p < 0.05).CONCLUSIONS: Both young and older adults displayed improvements in OP and physical HRQoL 5 years post-RYGB compared to baseline, while mental HRQoL did not improve to the same extent. Greater HRQoL-improvements could be expected in older patients why future research on HRQoL post-RYGB should stratify data on age groups.
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| 19. |
- Falkstedt, Daniel, et al.
(author)
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Disability pensions related to heavy physical workload : a cohort study of middle-aged and older workers in Sweden
- 2021
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In: International Archives of Occupational and Environmental Health. - : Springer Science and Business Media LLC. - 0340-0131 .- 1432-1246. ; 94, s. 1851-1861
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Journal article (peer-reviewed)abstract
- Objectives The aim of the study was to examine the associations between heavy physical workload among middle-aged and older workers and disability pension due to any diagnosis, as well as musculoskeletal, psychiatric, cardiovascular or respiratory diagnoses. The population-based design made it possible to examine dose-response and potential gender differences in the associations. Methods About 1.8 million men and women aged 44-63 years and registered as living in Sweden in 2005 were followed regarding disability pension during 2006-2016, until ages 55-65 years. Mean values of physical workload and job control, estimated through gender-specific job-exposure matrices (JEMs), were assigned to individuals through their occupational titles in 2005. Exposure values were ranked separately for women and men and divided into quintiles. Associations were analyzed with Cox proportional-hazards regression. Results The analyses showed robust, dose-response associations between physical workload and disability pension with a musculoskeletal diagnosis in both genders: the adjusted hazard ratio and 95% confidence interval for those with the heaviest exposure was 2.58 (2.37-2.81) in women and 3.34 (2.83-3.94) in men. Dose-response associations were also seen in relation to disability pension with a cardiovascular or a respiratory diagnosis, though the hazard ratios were smaller. Physical workload was not associated with disability pension with a psychiatric diagnosis after adjustment for job control. Conclusion This study of the entire Swedish population of middle-aged and older workers suggests that higher degrees of physical workload may increase the risk of disability pension overall, and specifically with musculoskeletal, cardiovascular or respiratory diagnosis, in both women and men.
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| 20. |
- Gauffin, Karl, et al.
(author)
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The effect of childhood socioeconomic position on alcohol-related disorders later in life : a Swedish national cohort study
- 2013
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In: Journal of Epidemiology and Community Health. - : BMJ. - 0143-005X .- 1470-2738. ; 67:11, s. 932-938
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Journal article (peer-reviewed)abstract
- Background: Alcohol use is the third most important global-health risk factor and a main contributor to health inequalities. Previous research on social determinants of alcohol-related disorders has delivered inconsistent results. We aimed to investigate whether socioeconomic position (SEP) in childhood predicts alcohol-related disorders in young adulthood in a Swedish national cohort.Methods: We studied a register-based national cohort of Swedish citizens born during 1973–1984 (N=948 518) and followed them up to 2009 from age 15. Childhood SEP was defined by a six-category socioeconomic index from the Censuses of 1985 and 1990. Rs of alcohol-related disorders, as indicated by register entries on alcohol-related death and alcohol-related medical care, were analysed in Cox regression models with adjustment for sociodemographic variables and indicators of parental morbidity and criminality.Results: Low childhood SEP was associated with alcohol-related disorders later in life among both men and women in a stepwise manner. Growing up in a household with the lowest SEP was associated with risk for alcohol-related disorders of HR: 2.24 (95% CI 2.08 to 2.42) after adjustment for sociodemographic variables, compared with the highest SEP group. Adjusting the analysis for parental psychosocial problems attenuated the association to HR 1.87 (95% CI 1.73 to 2.01).Conclusions: The study demonstrates that low SEP in childhood predicts alcohol-related disorders in young adulthood. Alcohol abuse needs to be addressed in policies to bridge the gap of health inequalities.
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| 21. |
- Grahn, Karin, et al.
(author)
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Occupational exposure to particles and increased risk of developing chronic obstructive pulmonary disease (COPD) : A population-based cohort study in Stockholm, Sweden
- 2021
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In: Environmental Research. - : Elsevier BV. - 0013-9351 .- 1096-0953. ; 200
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Journal article (peer-reviewed)abstract
- Objectives: Chronic Obstructive Pulmonary Disease (COPD) is a common respiratory disorder. Next to tobacco smoking, occupational exposure is the most important risk factor for COPD in high-income countries. To enable preventative measures, more knowledge is needed on which specific occupational exposures that are related to risk of developing COPD in men and women.Methods: A population-based cohort was formed from subjects responding to the Stockholm Public Health Surveys in 2002, 2006, and 2010, followed up until 2014. The dataset was linked to a quantitative job exposure matrix via occupational titles from the 1990 nation-wide Population and housing census. We identified COPD among subjects having medication for COPD and/or reporting a physician’s diagnosis of COPD. The gender- specific risks to develop COPD from occupational particle-exposure were estimated by proportional hazards regression model, adjusted for age and individual data on tobacco-smoking.Results: Men exposed to respirable crystalline silica (RCS) (HR 1.46, CI 1.13–1.90), gypsum and insulation material (HR 1.56, CI 1.18–2.05), diesel exhaust (HR 1.18, CI 0.99–1.41) and high levels of particles from asphalt/ bitumen (HR 1.71, CI 1.06–2.76) as well as welding fumes (HR 1.57, CI 1.12–2.21) had an increased smoking- adjusted risk for developing COPD. An increased risk was also observed among women highly exposed to various organic particles from soil, leather, plastic, soot, animal, textile, flour (HR 1.53, CI 1.15–2.04). Furthermore, a significant positive exposure-response trend was found among men exposed to RCS, iron dust, gypsum and insulation material, and diesel exhaust. A tendency towards an exposure-response relationship was also seen among both men and women exposed to welding fumes and various organic particles, and among men exposed to particles from asphalt/bitumen. The population attributable fraction for COPD from occupational exposure to particles was 10.6% among men and 6.1% among women.Conclusions: This study indicates an increased smoking-adjusted risk of developing of COPD due to occupational exposure to particles. A positive exposure-response relationship was found for RCS, gypsum and insulation, diesel exhaust, and welding fumes. Also, exposure to high levels of asphalt/bitumen and various organic particles was associated with a higher risk for COPD. Reduction of these exposures in the work environment are important to prevent future cases of COPD. More studies are needed to investigate exposure-response relationships further, but this study indicates that the European occupational exposure limit (OEL) for RCS needs to be re-evaluated.
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| 22. |
- Gustavsson, Anders, 1950-, et al.
(author)
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Children with Down’s syndrome in mainstream schools: peer interaction in activities
- 2010
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In: European Journal of Special Needs Education. - : Informa UK Limited. - 0885-6257 .- 1469-591X. ; 25:3, s. 283-294
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Journal article (peer-reviewed)abstract
- The aim of this study was to explore interaction in school activities of pupils with Down syndrome in mainstream schools to understand enabling conditions. Six ten year old pupils with Down syndrome were observed in their class, and interviewed. By applying qualitative methodology, we identified two main categories; equal and unequal interaction. Unequal interaction comprised patterns of peer supported and non-supported interaction. Peers’ support comprised modifying tasks, activities or their own behavior that enabled interaction with a less competent pupil. Peers support are discussed within the frames of inclusive schooling.
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| 23. |
- Hemmingsson, Anders, et al.
(author)
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Contrast agents in acute myocardial infarction
- 2001
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In: Magnetic Resonance Materials in Physics, Biology and Medicine. - 0968-5243 .- 1352-8661. ; 12:2-3, s. 96-98
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Journal article (peer-reviewed)abstract
- The experimental design in examination of acute myocardial infarctions should be valid in terms of flow, perfusion and re-flow after intervention. The contrast agents concentration in experimental studies can be measured by microdialysis. We have assessed the usefulness of different extracellular and blood pool contrast agents for visualization of the area at risk in coronary artery occlusions. The double contrast technique, where Dy-DTPA-BMA was combined with Gd-DTPA-BMA yielded a superior infarct visualization. Blood pool agents for example NC100/150 injection is also promising in first path myocardial perfusion imaging.
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| 24. |
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| 25. |
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| 26. |
- Hemmingsson, Felix, 1992, et al.
(author)
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CO2 Methanation over Rh/CeO2 Studied with Infrared Modulation Excitation Spectroscopy and Phase Sensitive Detection
- 2020
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In: Catalysts. - : MDPI AG. - 2073-4344. ; 10:6
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Journal article (peer-reviewed)abstract
- Methane is a well-established fuel molecule whose production from CO2 through methanation garners increasing interest as an energy storage solution. While often produced with Ni based catalysts, other metals are of interest thanks to higher robustness and activity-selectivity numbers. The Rh/CeO2 catalyst has shown appreciable properties for CO2 methanation and its structural dynamics has been studied in situ. However, the reaction pathway is unknown. Here, we present infrared modulation excitation spectroscopy measurements with phase sensitive detection of a Rh/CeO2 catalyst adsorbate composition during H2 pulsing (0–2 vol.%) to a constant CO2 (0.5 vol.%) feed. Various carbonyl (CO) and carbonate (b-CO3 /p-CO3 ) ad-species clearly respond to the hydrogen stimulus, making them potential reaction intermediates. The different CO ad-species are likely intermediates for product CO and CH4 but their individual contributions to the respective formations are not unambiguously ascertained. As for the carbonate dynamics, it might be linked to the reduction/oxidation of the CeO2 surface upon H2 pulsing. Formate (HCOO) ad-species are clearly visible but appear to be, if not spectators, linked to slow side reactions possibly also affected by CeO2 redox processes.
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| 27. |
- Hemmingsson, Helena, et al.
(author)
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Participation in school : School assistants creating opportunities and obstacles for pupils with disabilities
- 2003
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In: OTJR (Thorofare, N.J.). - : SAGE Publications. - 1539-4492 .- 1938-2383. ; 23:3, s. 88-98
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Journal article (peer-reviewed)abstract
- This study addresses how help is provided for pupils with physical disabilities and how school assistants influence their participation in school. Data were collected through field observations and interviews with seven pupils between 7 and 15 years old and with each pupil’s teacher and assistant. The analysis resulted in a description of features that influenced how help was provided and the consequences in school for the pupil with disabilities. A major finding was that the assistants could both facilitate and hinder participation. We concluded that an awareness of the priority the pupils place on social participation with their peers is needed to ensure effective and flexible support is made available to pupils with disabilities.
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| 28. |
- Hemmingsson, Helena, et al.
(author)
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Students with disabilities participating in mainstream schools : policies that promote and limit teacher and therapist cooperation
- 2007
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In: Disability & Society. - : Informa UK Limited. - 0968-7599 .- 1360-0508. ; 22:4, s. 383-398
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Journal article (peer-reviewed)abstract
- This paper examines participatory arrangements for students with physical disabilities in mainstream education, cooperation between teachers and therapists to ensure that these arrangements are efficient and the organizational prerequisites for such cooperation. The study comprises data obtained from 14 'groups', with each group consisting of a student with physical disabilities aged 919 years, their main teacher and the relevant therapists from the local habilitation centre. Data were collected through semi-structured interviews, field observations and a review of relevant documents, including legislation. The results reveal a lack of cooperation between teacher and therapist which results in students with disabilities receiving suboptimal participatory arrangements in school. Differences in the perspectives of the teachers and therapists and in the way they act and perceive their responsibilities were anchored in institutional and societal documents and the distribution of resources. The implications for students with disabilities are discussed.
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| 29. |
- Hemmingsson, Helena, et al.
(author)
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Temporal aspects of teaching and learning - implications for pupils wiyh physical disabilities
- 1999
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In: Scandinavian Journal of Disability Research. - : Stockholm University Press. - 1501-7419 .- 1745-3011. ; 2:2, s. 26-43
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Journal article (peer-reviewed)abstract
- The aim of this study was to describe and try to understand how temporal structures in school setting influence the performance of daily school tasks for pupils with physical disabilities. Seven pupils between 7 and 15 years of age were included. Data were collected through field observations and semi‐structured interviews with pupils and each pupil's teacher. The findings show that pupils with disabilities often did not have the time to perform regular daily school activities such as reading and writing. The pupils’ time problems were to a large extent influenced by the teaching styles. Four teaching styles were identified. The number of pupils in the class seemed to influence the teacher's choice of teaching style. Variation in teaching styles also could be understood in relation to how teachers handled an educational dilemma that was discovered. Implications of the study on teaching and learning in relation to pupils with physical disabilities are discussed.
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| 30. |
- Hemmingsson, Helena, et al.
(author)
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Validity of the school Setting Interview : An Assessment of the Student - Envirement Fit
- 2004
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In: Scandinavian Journal of Occupational Therapy. - : Informa UK Limited. - 1103-8128 .- 1651-2014. ; 11, s. 171-178
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Journal article (peer-reviewed)abstract
- The School Setting Interview (SSI) is an internationally used client-centred interview assessment that specifically investigates the student - environment fit for students with physical disabilities. In this study the Rasch measurement model was used to examine validity of the SSI; specifically, whether or not the SSI measures a unidimensional construct. Data for analysis included SSI assessments of 87 Swedish students with physical disabilities aged between 8 and 19 years of age. The results of the Rasch analysis revealed that all items had acceptable infit MnSq and z values supporting evidence of construct validity of the SSI. The established order of the difficulty of the items was also shown to be in acceptable congruence with the theoretical basis for item development. In addition, the analysis revealed aspects of the SSI that need improvements, such as the need for more challenging items and refinements of the manual. Further investigations of validity in different cultural contexts are recommended.
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| 31. |
- Kocher Stalder, Cornelia, et al.
(author)
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Children's and teachers' perspectives on adjustments needed in school settings after acquired brain injury.
- 2018
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In: Scandinavian Journal of Occupational Therapy. - : John Wiley & Sons. - 1103-8128 .- 1651-2014. ; 25:4, s. 233-242
-
Journal article (peer-reviewed)abstract
- Background: Children with acquired brain injury (ABI) often present with functional deficits that influence their societal participation and well-being. Successful reintegration into school calls for individual support to meet each child’s adjustment needs. The adjustment needs of children with ABI in school settings have not previously been explored.Aim: The objectives of the present study were (a) to describe adjustment needs in school settings for children with ABI and (b) to explore differences and similarities between reports from the children and their teachers.Methods: In this cross-sectional study, 20 children with ABI (mean age 12.8 ± 3.4 years; class grade 1–10) and their teachers were interviewed individually, using the School Setting Interview (SSI). Data were analyzed with descriptive and with non-parametric statistics.Results: (a) In the overall group, children rated that 55.6% of the 16 activities in the SSI needed no adjustment. The corresponding percentage for teachers was 48.4%. (b) In the child-teacher pairs, there was a positive relationship between teachers’ and children’s responses only in 3 out of 16 school activities and agreement varied strongly according to the activity in question.Conclusions and significance: It is important for occupational therapists and other professionals to specifically consider adjustment needs relating to school activities from various perspectives when aiming to provide individualized interventions.
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| 32. |
- Martin, Natalia Mihaela, 1984, et al.
(author)
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Structure-function relationship during CO2 methanation over Rh/Al2O3 and Rh/SiO2 catalysts at atmospheric pressure conditions
- 2018
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In: Catalysis Science and Technology. - : Royal Society of Chemistry (RSC). - 2044-4753 .- 2044-4761. ; 8:10, s. 2686-2696
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Journal article (peer-reviewed)abstract
- The effect of support material and chemical state of Rh for Rh/Al2O3 and Rh/SiO2 model catalysts during CO2 hydrogenation were studied by a combined array of in situ characterisation techniques including diffuse reflectance infrared Fourier transform spectroscopy, energy-dispersive X-ray absorption spectroscopy and high-energy X-ray diffraction at 250-350 °C and atmospheric pressure. The CO2 methanation proceeds via intermediate formation of adsorbed CO species on metallic Rh likely followed by their hydrogenation to methane. Linearly-bonded CO species is suggested to be a more active precursor in the hydrogenation compared to the bridge-bonded species, which seems to relate to particle size effects: for larger particles mainly the formation of inactive bridge-bonded CO species takes place. Further, analysis of the chemical state of Rh during reaction conditions reveal a minor formation of RhOx from dissociation of CO2 , which is a consequence of the increased activity observed over Rh/Al2O3 catalyst.
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| 33. |
- Martin, Natalia M., et al.
(author)
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Structure-function relationship for CO2 methanation over ceria supported Rh and Ni catalysts under atmospheric pressure conditions
- 2019
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In: Catalysis Science & Technology. - : Royal Society of Chemistry. - 2044-4753 .- 2044-4761. ; 9:7, s. 1644-1653
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Journal article (peer-reviewed)abstract
- In situ structural and chemical state characterization of Rh/CeO2 and Ni/CeO2 catalysts during atmospheric pressure CO2 methanation has been performed by a combined array of time-resolved analytical techniques including ambient-pressure X-ray photoelectron spectroscopy, high-energy X-ray diffraction and diffuse reflectance infrared Fourier transform spectroscopy. The ceria phase is partially reduced during the CO2 methanation and in particular Ce3+ species seem to facilitate activation of CO2 molecules. The activated CO2 molecules then react with atomic hydrogen provided from H-2 dissociation on Rh and Ni sites to form formate species. For the most active catalyst (Rh/CeO2), transmission electron microscopy measurements show that the Rh nanoparticles are small (average 4 nm, but with a long tail towards smaller particles) due to a strong interaction between Rh particles and the ceria phase. In contrast, larger nanoparticles were observed for the Ni/CeO2 catalyst (average 6 nm, with no crystallites below 5 nm found), suggesting a weaker interaction with the ceria phase. The higher selectivity towards methane of Rh/CeO2 is proposed to be due to the stronger metal-support interaction.
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| 34. |
- Martin, Natalia Mihaela, 1984, et al.
(author)
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Structure-function relationship for CO2 methanation over ceria supported Rh and Ni catalysts under atmospheric pressure conditions
- 2019
-
In: Catalysis Science and Technology. - 2044-4753 .- 2044-4761. ; 9:7, s. 1644-1653
-
Journal article (peer-reviewed)abstract
- In situ structural and chemical state characterization of Rh/CeO 2 and Ni/CeO 2 catalysts during atmospheric pressure CO 2 methanation has been performed by a combined array of time-resolved analytical techniques including ambient-pressure X-ray photoelectron spectroscopy, high-energy X-ray diffraction and diffuse reflectance infrared Fourier transform spectroscopy. The ceria phase is partially reduced during the CO 2 methanation and in particular Ce 3+ species seem to facilitate activation of CO 2 molecules. The activated CO 2 molecules then react with atomic hydrogen provided from H 2 dissociation on Rh and Ni sites to form formate species. For the most active catalyst (Rh/CeO 2 ), transmission electron microscopy measurements show that the Rh nanoparticles are small (average 4 nm, but with a long tail towards smaller particles) due to a strong interaction between Rh particles and the ceria phase. In contrast, larger nanoparticles were observed for the Ni/CeO 2 catalyst (average 6 nm, with no crystallites below 5 nm found), suggesting a weaker interaction with the ceria phase. The higher selectivity towards methane of Rh/CeO 2 is proposed to be due to the stronger metal-support interaction.
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| 35. |
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- Pozina, Galia, et al.
(author)
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Time-resolved photoluminescence properties of AlGaN/AlN/GaN high electron mobility transistor structures grown on 4H-SiC substrate
- 2008
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In: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 104:11, s. 113513-
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Journal article (peer-reviewed)abstract
- AlGaN/AlN/GaN high electron mobility transistor heterostructures grown by metal-organic chemical vapor deposition have been studied by temperature dependent time-resolved photoluminescence. The AlGaN-related emission is found to be sensitive to the excitation power and to the built-in internal electric field. In addition, this emission shows a shift to higher energy with the reduction in the excitation density, which is rather unusual. Using a self-consistent calculation of the band potential profile, we suggest a recombination mechanism for the AlGaN-related emission involving electrons confined in the triangular AlGaN quantum well and holes weakly localized due to potential fluctuations.
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| 37. |
- Velin, Peter, 1989, et al.
(author)
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Hampered PdO Redox Dynamics by Water Suppresses Lean Methane Oxidation over Realistic Palladium Catalysts
- 2021
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In: ChemCatChem. - : Wiley. - 1867-3899 .- 1867-3880. ; 13:17, s. 3765-3771
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Journal article (peer-reviewed)abstract
- By use of operando spectroscopies under cycling reaction conditions, water is shown to hamper the redox dynamics of realistic palladium oxide nanoparticles dispersed onto alumina and hydrophobic zeolite supports thereby lowering the activity for total oxidation of methane. Water adsorption forms hydroxyl ad-species that block the methane and oxygen dissociation and seem to prevent lattice oxygen to take part in the methane oxidation. The main catalytic action is thus proposed to shift from the Mars-van Krevelen mechanism in dry conditions to a slower route that relies on Langmuir-Hinshelwood type of steps in wet conditions. This key finding has clear implications on catalyst design for low-temperature gas combustion emission control.
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| 38. |
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| 39. |
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| 40. |
- Wang, C, et al.
(author)
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MR imaging properties and pharmacokinetics of MnDPDP in healthy volunteers
- 1997
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In: Acta Radiologica. - 0284-1851 .- 1600-0455. ; 38:4 Pt 2, s. 665-676
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Journal article (peer-reviewed)abstract
- PURPOSE: Thirteen male volunteers were studied to evaluate the MR imaging properties and pharmacokinetics of 10 mM mangafodipir trisodium infusion (MnDPDP, Teslascan). MATERIAL AND METHODS: Doses of 5 and 10 mumol/kg b.w. were administered by bolus injection (< 1 min) to 5 subjects, and by infusion (20 min) to 8 subjects, with a 3-week wash-out between doses. Infusion subjects underwent MR imaging. RESULTS: At 1 h after infusion, the plasma concentration of Mn was reduced to approximately 15% of the maximum value. Fifteen to 20% of Mn was recovered in the urine, and 50-60% was recovered in the faeces. The rapid initial plasma clearance of Mn is consistent with both rapid tissue uptake and rapid renal elimination. Increases in signal intensity were apparent on T1-weighted images of the liver, pancreas, spleen, renal cortex and the renal medulla, but not in regions of the brain protected by an intact blood-brain barrier. Increases were seen in the choroid plexus and pituitary. Contrast-related adverse events, only flushing of moderate intensity, occurred in bolus injection subjects. CONCLUSION: At 5 and 10 mumol/kg, mangafodipir produces relatively long-lasting enhancement of several abdominal organs, including the liver, pancreas and kidney.
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| 41. |
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| 42. |
- Wang, Chen, et al.
(author)
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Uptake of mangafodipir trisodium in liver metastases from endocrine tumors
- 1998
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In: Journal of Magnetic Resonance Imaging. - 1053-1807 .- 1522-2586. ; 8:3, s. 682-686
-
Journal article (peer-reviewed)abstract
- The purpose of the study was to investigate retrospectively whether mangafodipir trisodium (MnDPDP) can enhance the liver metastases from endocrine tumors. Thirteen patients with endocrine tumors and liver metastases underwent T1-weighted spin-echo (SE) and turbo gradient-echo (GRE) MRI conducted before and 20 to 60 minutes after i.v. infusion of MnDPDP. Additional 24-hour-delay scans were performed in 8 of 13 patients. MR signal intensity (SI) was measured in liver parenchyma and metastases, which was then related to that of paraspinal muscle. A total of 30 lesions on precontrast and postcontrast images and 18 lesions on 24-hour-delay images were measured. An enhancement by 49% in SE and 40% in GRE images (P = .0001) was observed in tumor tissues after MnDPDP infusion. In 24-hour-delay images, the SI of the lesions remained relatively high, but in liver parenchyma, it decreased significantly, and the tumor-liver tissue contrast was reduced.
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| 43. |
- Wang, Xueting, 1991, et al.
(author)
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Methane Adsorption and Methanol Desorption for Copper Modified Boron Silicate
- 2018
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In: RSC Advances. - : Royal Society of Chemistry (RSC). - 2046-2069. ; 8:63, s. 36369-36374
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Journal article (peer-reviewed)abstract
- Boron silicate (BS) with a chabazite framework structure was synthesised using a direct route and rigorously characterized before it was ion-exchanged with copper to form Cu-BS. Employing in situ infrared spectroscopy, we show that Cu-BS is capable of oxidising methane to methoxy species and methanol interacts with the boron sites without deprotonation.
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| 44. |
- Weis, Jan, et al.
(author)
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Characterization of human head vasculature by percolation parameters
- 1999
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In: Magnetic Resonance Imaging. - 0730-725X .- 1873-5894. ; 17:3, s. 411-415
-
Journal article (peer-reviewed)abstract
- A data reduction procedure, originally proposed for characterization of fractals and random percolation clusters, has been used to evaluate the vascular system of the human head. The motivation behind this study arose from the wish to study empirically transport properties of vascular systems and to find a suitable formalism for their description. MR angiographic data acquired by a standard 3D inflow method were used. The evaluated parameters refer to the backbone fractal dimensionality and the correlation length. The fractal dimensionality of the backbone was found to be 1.71 for the human head vasculature. This value fits the theoretical range of random percolation networks. It is concluded that concepts of percolation theory might have some value for characterizing the structure and transport properties of the vascular system.
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