| 1. |
- Öylü, Gülin, 1990-, et al.
(författare)
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Tackling ageism during a global health crisis: multilevel, intersectoral & transnational collaboration for active and healthyageing
- 2020
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- This Policy Brief portrays two large-scale international projects which take on the ageing challenge, one focusing on tackling ‘ageism’, and the other one on improving multilevel governance and evidence-based decision-making for ‘active and healthy ageing’ (AHA). Both EuroAgeism and ASTAHG have picked up on the ageing challenge as they aim to understand the obstacles that people face because of their age, try to improve the overall quality of life of older people, and to remove barriers for their active participation in an age-inclusive society. The relevance of projects like ASTAHG and EuroAgeism has been well recognized even before the COVID-19 pandemic, but their importance has risen drastically ever since.
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| 2. |
- Aad, G., et al.
(författare)
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- 2013
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Tidskriftsartikel (refereegranskat)
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| 3. |
- Aad, G., et al.
(författare)
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- 2014
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Tidskriftsartikel (refereegranskat)
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| 4. |
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| 5. |
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| 6. |
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| 7. |
- Feng, Zhuo, et al.
(författare)
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Nurse logs: A common seedling strategy in the Permian Cathaysian flora
- 2022
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Ingår i: iScience. - Cambridge, Massachusetts : Elsevier BV. - 2589-0042. ; 25, s. 1-11
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Tidskriftsartikel (refereegranskat)abstract
- Nurse logs are common in modern forests from boreal to temperate and tropical ecosystems. However, the evolution of the nurse-log strategy remains elusive because of their rare occurrence in the fossil record. We report seven coniferous nurse logs from lowermost to uppermost Permian strata of northern China that have been colonized by conifer and sphenophyllalean roots. These roots are associated with two types of arthropod coprolites and fungal remains. Our study provides the first glimpse into plant—plant facilitative relationships between late Paleozoic gymnosperms and sphenopsids. Detritivorous arthropods and fungi appear to have been crucial for the utilization of nurse logs in Permian forests. The phylogenetically distant roots demonstrate that nurse-log interaction wasa sophisticated seedling strategy in late Paleozoic humid tropical forests, and this approach may have been adopted and developed by a succession of plant groups leading to its wide representation in modern forest ecosystems.
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| 8. |
- Aad, G., et al.
(författare)
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- 2012
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swepub:Mat__t (refereegranskat)
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| 9. |
- Aad, G., et al.
(författare)
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- 2013
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Tidskriftsartikel (refereegranskat)
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| 10. |
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| 11. |
- Engwall, Olov, et al.
(författare)
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Identification of low-engaged learners in robot-led second language conversations with adults
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- The main aim of this study is to investigate if verbal, vocal and facial information can be used to identify low-engaged second language learners in robot-led conversation practice. The experiments were performed on voice recordings and video data from 50 conversations, in which a robotic head talks with pairs of adult language learners using four different interaction strategies with varying robot-learner focus and initiative. It was found that these robot interaction strategies influenced learner activity and engagement. The verbal analysis indicated that learners with low activity rated the robot significantly lower on two out of four scales related to social competence. The acoustic vocal and video-based facial analysis, based on manual annotations or machine learning classification, both showed that learners with low engagement rated the robot’s social competencies consistently, and in several cases significantly, lower, and in addition rated the learning effectiveness lower. The agreement between manual and automatic identification of low-engaged learners based on voice recordings or face videos was further found to be adequate for future use. These experiments constitute a first step towards enabling adaption to learners’ activity and engagement through within- and between-strategy changes of the robot’s interaction with learners.
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| 12. |
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| 13. |
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| 14. |
- Abel, Ian, 1985, et al.
(författare)
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Multiscale modelling for tokamak pedestals
- 2018
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Ingår i: Journal of Plasma Physics. - 0022-3778 .- 1469-7807. ; 84:2
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Tidskriftsartikel (refereegranskat)abstract
- Pedestal modelling is crucial to predict the performance of future fusion devices. Current modelling efforts suffer either from a lack of kinetic physics, or an excess of computational complexity. To ameliorate these problems, we take a first-principles multiscale approach to the pedestal. We will present three separate sets of equations, covering the dynamics of edge localised modes (ELMs), the inter-ELM pedestal and pedestal turbulence, respectively. Precisely how these equations should be coupled to each other is covered in detail. This framework is completely self-consistent; it is derived from first principles by means of an asymptotic expansion of the fundamental Vlasov-Landau-Maxwell system in appropriate small parameters. The derivation exploits the narrowness of the pedestal region, the smallness of the thermal gyroradius and the low plasma beta (the ratio of thermal to magnetic pressures) typical of current pedestal operation to achieve its simplifications. The relationship between this framework and gyrokinetics is analysed, and possibilities to directly match our systems of equations onto multiscale gyrokinetics are explored. A detailed comparison between our model and other models in the literature is performed. Finally, the potential for matching this framework onto an open-field-line region is briefly discussed.
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| 15. |
- Romaguera, Dora, et al.
(författare)
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Adherence to the Mediterranean Diet Is Associated with Lower Abdominal Adiposity in European Men and Women
- 2009
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Ingår i: Journal of Nutrition. - : Elsevier BV. - 1541-6100 .- 0022-3166. ; 139:9, s. 1728-1737
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Tidskriftsartikel (refereegranskat)abstract
- Given the lack of consistent evidence of the relationship between Mediterranean dietary patterns and body fat, we assessed the cross-sectional association between adherence to a modified Mediterranean diet, BMI, and waist circumference (WC). A total of 497,308 individuals (70.7% women) aged 25-70 y from 10 European countries participated in this study. Diet was assessed at baseline using detailed validated country-specific questionnaires, and anthropometrical measurements were collected using standardized procedures. The association between the degree of adherence to the modified-Mediterranean Diet Score (mMDS) (including high consumption of vegetables, legumes, fruits and nuts, cereals, fish and seafood, and unsaturated: saturated fatty acids ratio; moderate alcohol intake; and low consumption of meat and meat products and dairy products) and BMI (kg.m(-2)) or WC (cm was modeled through mixed-effects linear regression, controlling for potential confounders. Overall, the mMDS was not significantly associated with BMI. Higher adherence to the Mediterranean diet was significantly associated with lower WC, for a given BMI, in both men (-0.09; 95% CI -0.14 to -0.04) and women (-0.06; 95% CI -0.10 to -0.01). The association was stronger in men (-0.20; 95% CI -0.23 to -0.17) and women (-0.17; 95% CI -0.21 to -0.13) from Northern European countries. Despite the observed heterogeneity among regions, results of this study suggest that adherence to a modified Mediterranean diet, high in foods of vegetable origin and unsaturated fatty acids, is associated with lower abdominal adiposity measured by WC in European men and women. J. Nutr. 139: 1728-1737, 2009.
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| 16. |
- Klintman, Marie, et al.
(författare)
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Changes in expression of genes representing key biologic processes after neoadjuvant chemotherapy in breast cancer, and prognostic implications in residual disease
- 2016
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Ingår i: Clinical Cancer Research. - 1078-0432. ; 22:10, s. 2405-2416
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: The primary aim was to derive evidence for or against the clinical importance of several biologic processes in patients treated with neoadjuvant chemotherapy (NAC) by assessing expression of selected genes with prior implications in prognosis or treatment resistance. The secondary aim was to determine the prognostic impact in residual disease of the genes' expression. Experimental Design: Expression levels of 24 genes were quantified by NanoString nCounter on formalin-fixed paraffinembedded residual tumors from 126 patients treated with NAC and 56 paired presurgical biopsies. The paired t test was used for testing changes in gene expression, and Cox regression and penalized elastic-net Cox Regression for estimating HRs. Results: After NAC, 12 genes were significantly up- and 8 downregulated. Fourteen genes were significantly associated with time to recurrence in univariable analysis in residual disease. In a multivariable model, ACACB, CD3D, MKI67, and TOP2A added prognostic value independent of clinical ER-, PgR-, and HER2- status. In ER+/HER2- patients, ACACB, PAWR, and ERBB2 predicted outcome, whereas CD3D and PAWR were prognostic in ER-/HER2- patients. By use of elastic-net analysis, a 6-gene signature (ACACB, CD3D, DECORIN, ESR1, MKI67, PLAU) was identified adding prognostic value independent of ER, PgR, and HER2. Conclusions: Most of the tested genes were significantly enriched or depleted in response to NAC. Expression levels of genes representing proliferation, stromal activation, metabolism, apoptosis, stemcellness, immunologic response, and Ras-ERK activation predicted outcome in residual disease. Themultivariable gene models identified could, if validated, be used to identify patients needing additional post-neoadjuvant treatment to improve prognosis.
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| 17. |
- Kota, Hanumantha Rao, et al.
(författare)
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Mixed anionic/non-ionic collectors in phosphate gangue flotation from magnetite fines
- 2011
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Ingår i: Open Mineral Processing Journal. - : Bentham Science Publishers Ltd.. - 1874-8414. ; 4, s. 14-24
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Tidskriftsartikel (refereegranskat)abstract
- Scientists and technologists in world over are making large efforts to streamline the conventional technological schemes of ore processing, in particular froth flotation towards reducing overall costs, limiting the use of dangerous substances, decreasing waste streams and improving waste disposal. Hitherto, search for such innovations has been performed mainly empirically and there is an urgent need to shift these technologies to be more innovative and effective.Understanding of the fundamental concepts of aquatic chemistry of minerals–selective adsorption and selective redox reactions at mineral–solution interfaces would impact innovating conventional flotation process Molecular-level knowledge and coherent understanding of minerals contacted with aqueous solutions is required which underlie great opportunities in controlling mineral–solution interfaces towards the grand challenge of tomorrow’s science and mineral processing technology. Aqueous redox chemistry of sulphides and adsorption mechanisms, the problems of metal sulphides selectivity against pyrite and fine particle flotation have been highlighted and discussed in the light of literature. The requisite knowledge and research needs to address these issues have also been briefly presented.
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| 18. |
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| 19. |
- Tuominen, Tina, et al.
(författare)
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Actors inhibiting and enabling Service Systems : Bringing the Perfomative View on Organisational Routines to Service Systems
- 2015
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Ingår i: Proceedings of QUIS14. ; , s. 707-716
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Konferensbidrag (refereegranskat)abstract
- This paper suggests a theoretical perspective for analysing how different engaged actors enable or inhibit service innovations. To do so, we integrate theories of organisational routines with current understanding of innovations from a service-dominant logic lens. We conceptualise service as collective value creation routines – that is, repetitive, recognisable patterns of interdependent actions of multiple actors – and treat service innovation as institutionalised change in these routines. This actor-centric framework captures the dynamics between unique value co-creation situations and service innovations, and suggests that innovation may emanate from planned change or variation in performance, either at local or systemic level. We discuss how the roles and power relations among actors evolve in different cases, and discuss implications for future research.
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| 20. |
- Klintman, Mikael, et al.
(författare)
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“Challenges to Legitimacy in Food Safety Governance? The Case of the European Food Safety Authority”
- 2010
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Ingår i: Journal of European Integration. - 0703-6337. ; 32:3, s. 309-327
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Tidskriftsartikel (refereegranskat)abstract
- The ‘old’ forms of governance have been criticised for being neither sufficiently democratic nor effective. The popularity of ‘new’ modes of governance includes the embracing of values – integral to democratic processes – such as legitimacy, public accountability and trust. By relating parts of this ‘old-vs.-new’ distinction to March & Olsen’s dichotomy of aggregative vs. integrative political processes, the aim of this paper is to find patterns for how such processes are combined in European food safety governance. The paper focuses on the European Food Safety Authority (EFSA). What forms of participation can be found in ‘new’ food safety governance? How are these forms of participation related to the aims of increasing the legitimacy? The article discusses challenges involved in EFSA’s mixing of integrative goals and the organisation’s view of food safety politics, in which aggregative policy processes are conceived as a rough ‘natural state’ which should be tamed.
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| 21. |
- Palmér, Hanna, 1974-, et al.
(författare)
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Making toddlers’ numerical competence visible : without relying solely on verbal utterances
- 2024
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Ingår i: Early years. - : Taylor & Francis. - 0957-5146 .- 1472-4421. ; , s. 1-15
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Tidskriftsartikel (refereegranskat)abstract
- There is a growing consensus in research that children’s numerical competence starts to develop at a very early age. However, there are few tools for screening the development of early numerical competence and thereby making this development researchable. One obstacle in designing such tools is that verbal utterances cannot be used as the primary source for exploring the numerical competence of young children. The focus of this article is metho-dological, namely how toddlers’ (1–3-year-olds’) ways of experien-cing numbers can be made visible in research without relying solely on verbal utterances. A theoretically driven interview tool was developed based on five principles of: context, numbers, process, multiple-method activity approach, and differentiation. The two principles of numbers and process vouched for internal validity, while the three principles of context, multiple-method activity approach and differentiation vouched for external and ecological validity. Examples of empirically tested interview tasks are also presented and discussed.
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| 22. |
- van Horn, Martin, et al.
(författare)
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Transition moments beyond the electric-dipole approximation : Visualization and basis set requirements
- 2023
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Ingår i: Journal of Chemical Physics. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 158:18
-
Tidskriftsartikel (refereegranskat)abstract
- In the simulation of x-ray absorption spectroscopy, the validity of the electric-dipole approximation comes into question. Three different schemes exist to go beyond this approximation: the first scheme is based on the full semi-classical light-matter interaction, whereas the latter two schemes, referred to as the generalized length and velocity representation, are based on truncated multipole expansions. Even though these schemes have been successfully implemented in several quantum chemistry codes, their basis set requirements remained largely unknown. Here, we assess basis set requirements of these three schemes. We have considered 1s1/2 and 7s1/2 → 7p1/2 transitions in the radium atom, representative of core and valence excitations, respectively, and carried out calculations with dyall.aeXz (X = 2, 3, 4) basis sets at the four-component relativistic TD-HF level of theory. Our basis set study was greatly facilitated by the generation and visualization of radial distributions of transition moment densities, allowing for a straightforward comparison with equivalent finite-difference calculations. Pertaining to the truncated interaction, we find that the length representation electric multipole is the easiest to converge, requiring the dyall.ae2z basis for low-order multipoles and the dyall.ae4z basis at higher orders. The magnetic multipole moments follow a similar trend although they are more difficult to converge. The velocity representation electric multipoles are the most difficult to converge: at high orders, the dyall.ae3z and dyall.ae4z basis sets introduce artificial peaks and oscillations, which increase the overall error. These artifacts are associated with linear dependence issues in the small component space of larger basis sets. The full interaction operator, however, does not suffer from these problems, and we therefore recommend its use in the simulation of x-ray spectroscopy.
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| 23. |
- Katsimpouras, Constantinos, et al.
(författare)
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A thermostable GH26 endo-β-mannanase from Myceliophthora thermophila capable of enhancing lignocellulose degradation
- 2016
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Ingår i: Applied Microbiology and Biotechnology. - : Springer Science and Business Media LLC. - 0175-7598 .- 1432-0614. ; 100:19, s. 8385-8397
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Tidskriftsartikel (refereegranskat)abstract
- The endomannanase gene em26a from the thermophilic fungus Myceliophthora thermophila, belonging to the glycoside hydrolase family 26, was functionally expressed in the methylotrophic yeast Pichia pastoris. The putative endomannanase, dubbed MtMan26A, was purified to homogeneity (60 kDa) and subsequently characterized. The optimum pH and temperature for the enzymatic activity of MtMan26A were 6.0 and 60 °C, respectively. MtMan26A showed high specific activity against konjac glucomannan and carob galactomannan, while it also exhibited high thermal stability with a half-life of 14.4 h at 60 °C. Thermostability is of great importance, especially in industrial processes where harsh conditions are employed. With the aim of better understanding its structure–function relationships, a homology model of MtMan26A was constructed, based on the crystallographic structure of a close homologue. Finally, the addition of MtMan26A as a supplement to the commercial enzyme mixture Celluclast® 1.5 L and Novozyme® 188 resulted in enhanced enzymatic hydrolysis of pretreated beechwood sawdust, improving the release of total reducing sugars and glucose by 13 and 12 %, respectively.
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| 24. |
- Aad, G., et al.
(författare)
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- 2013
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Tidskriftsartikel (refereegranskat)
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| 25. |
- Blumi, Isa
(författare)
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The Red Sea : In Search of Lost Space
- 2019
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Ingår i: Global Intellectual History. - : Informa UK Limited. - 2380-1883 .- 2380-1891. ; 4:4, s. 410-411
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Recension (övrigt vetenskapligt/konstnärligt)
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| 26. |
- Flanagan, Erin, et al.
(författare)
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Exposure to local, source-specific ambient air pollution during pregnancy and autism in children : a cohort study from southern Sweden
- 2023
-
Ingår i: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 13:1
-
Tidskriftsartikel (refereegranskat)abstract
- Evidence of air pollution exposure, namely, ambient particulate matter (PM), during pregnancy and an increased risk of autism in children is growing; however, the unique PM sources that contribute to this association are currently unknown. The aim of the present study was to investigate local, source-specific ambient PM exposure during pregnancy and its associations with childhood autism, specifically, and autism spectrum disorders (ASD) as a group. A cohort of 40,245 singleton births from 2000 to 2009 in Scania, Sweden, was combined with data on locally emitted PM with an aerodynamic diameter < 2.5 µm (PM2.5). A flat, two-dimensional dispersion model was used to assess local PM2.5 concentrations (all-source PM2.5, small-scale residential heating- mainly wood burning, tailpipe exhaust, and vehicle wear-and-tear) at the mother’s residential address during pregnancy. Associations were analyzed using binary logistic regression. Exposure to local PM2.5 during pregnancy from each of the investigated sources was associated with childhood autism in the fully adjusted models. For ASD, similar, but less pronounced, associations were found. The results add to existing evidence that exposure to air pollution during pregnancy may be associated with an increased risk of childhood autism. Further, these findings suggest that locally produced emissions from both residential wood burning and road traffic-related sources (tailpipe exhaust and vehicle wear-and-tear) contribute to this association.
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| 27. |
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| 28. |
- Heynen, Martina, et al.
(författare)
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Home alone : the effects of isolation on uptake of a pharmaceutical contaminant in a social fish
- 2016
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Ingår i: Aquatic Toxicology. - : Elsevier. - 0166-445X .- 1879-1514. ; 180, s. 71-77
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Tidskriftsartikel (refereegranskat)abstract
- A wide range of biologically active pharmaceutical residues is present in aquatic systems worldwide. As uptake potential and the risk of effects in aquatic wildlife are directly coupled, the aim of this study was to investigate the relationships between stress by isolation, uptake and effects of the psychiatric pharmaceutical oxazepam in fish. To do this, we measured cortisol levels, behavioral stress responses, and oxazepam uptake under different stress and social conditions, in juvenile perch (Percafluviatilis) that were either exposed (1.03 mu gl(-1)) or not exposed to oxazepam. We found single exposed individuals to take up more oxazepam than individuals exposed in groups, likely as a result of stress caused by isolation. Furthermore, the bioconcentration factor (BCF) was significantly negatively correlated with fish weight in both social treatments. We found no effect of oxazepam exposure on body cortisol concentration or behavioral stress response. Most laboratory experiments, including standardized bioconcentration assays, are designed to minimize stress for the test organisms, however wild animals experience stress naturally. Hence, differences in stress levels between laboratory and natural environments can be one of the reasons why predictions from artificial laboratory experiments largely underestimate uptake of oxazepam, and other pharmaceuticals, in the wild.
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| 29. |
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| 30. |
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| 31. |
- Loy, Gareth, et al.
(författare)
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Detecting symmetry and symmetric constellations of features
- 2006
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Ingår i: COMPUTER VISION - ECCV 2006, PT 2, PROCEEDINGS. - Berlin, Heidelberg : Springer Berlin Heidelberg. - 3540338349 ; , s. 508-521
-
Konferensbidrag (refereegranskat)abstract
- A novel and efficient method is presented for grouping feature points on the basis of their underlying symmetry and characterising the symmetries present in an image. We show how symmetric pairs of features can be efficiently detected, how the symmetry bonding each pair is extracted and evaluated, and how these can be grouped into symmetric constellations that specify the dominant symmetries present in the image. Symmetries over all orientations and radii are considered simultaneously, and the method is able to detect local or global symmetries, locate symmetric figures in complex backgrounds, detect bilateral or rotational symmetry, and detect multiple incidences of symmetry.
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| 32. |
- Maguire, Kate, et al.
(författare)
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Tidal Disruptions of White Dwarfs : Theoretical Models and Observational Prospects
- 2020
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Ingår i: Space Science Reviews. - : Springer Science and Business Media LLC. - 0038-6308 .- 1572-9672. ; 216:3
-
Forskningsöversikt (refereegranskat)abstract
- White dwarf stars that enter the tidal radius of black holes with masses less than or similar to 10(5) M-circle dot are doomed to be ripped apart by tidal forces. Black holes in this mass range between stellar black holes and supermassive black holes have not been conclusively identified so the detection of a tidal disruption of a white dwarf would provide clear evidence for the existence of intermediate-mass black holes. In this review, we present a theoretical and observational overview of the transient events that result from the tidal disruptions of white dwarfs by intermediate-mass black holes. This includes discussion of the latest simulations and predicted properties, the results of observational searches, as well as a summary of the potential for gravitational wave emission to be detected with upcoming missions.
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| 33. |
- Maro, Salome, 1987
(författare)
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Addressing Traceability Challenges in the Development of Embedded Systems
- 2017
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Context: Currently, development e orts in embedded systems development lead to a large number of interconnected artifacts. Traceability enables understanding and managing these artifacts as they evolve. However, establishing traceability is not a trivial task, it requires the development organization to plan how traceability will t into its processes and provide tools to support traceability establishment. In practice, guidelines for how traceability should be established are lacking. Therefore, companies struggle with establishing traceability and making the most of traceability once it is established. Objective: The overall objective of this research is to improve traceability processes and tools for embedded systems development. In this thesis, we started with rst understanding the domain and practical traceability challenges and also investigated how traceability tools can be improved. Method: Since establishing traceability is a practical problem, our research is conducted in close collaboration with industry partners. We conducted qualitative empirical studies to understand which traceability challenges exist in reality and designed solutions for some of these challenges. Concretely, we used action research, case study and design science methods for the di erent studies. Results: Our studies show that establishing traceability in practice still has several challenges, the most prominent ones being: the manual work of establishing traceability is high; the engineers responsible for creating the links perceive it as an overhead; lack of tools to enable using traceability; lack of methods and tools to measure its quality; no universal standards for traceability to be shared and exchanged and it is di cult to measure the return on investment of establishing traceability. To reduce the amount of manual work needed to maintain traceability links, we designed guidelines that can be followed by tool developers. We also show the feasibility of a con gurable and extendable traceability management tool through a prototype implementation. Contributions: As part of this thesis, we have elicited persistent traceability challenges in development of embedded systems development. This list of challenges can also be used by other researchers who are interested in the topic of traceability for embedded systems development. As a rst initiative towards solving these challenges, we propose important factors and guidelines for traceability tool developers and organizations that need to acquire traceability tools. Lastly, we have demonstrated the feasibility of these factors and guidelines through a prototype implementation. This implementation is open source and available for industry to use in their development and for other researchers to use for studies and extend the tool.
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| 34. |
- Nagao, T., et al.
(författare)
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Evidence for multiple origins of fast declining Type II supernovae from spectropolarimetry of SN 2013ej and SN 2017ahn
- 2021
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 505:3, s. 3664-3680
-
Tidskriftsartikel (refereegranskat)abstract
- The origin of the diverse light-curve shapes of Type II supernovae (SNe), and whether they come from similar or distinct progenitors, has been actively discussed for decades. Here, we report spectropolarimetry of two fast declining Type II (Type IIL) SNe: SN 2013ej and SN 2017ahn. SN 2013ej exhibited high continuum polarization from very soon after the explosion to the radioactive tail phase with time-variable polarization angles. The origin of this polarimetric behaviour can be interpreted as the combination of two different aspherical structures, namely an aspherical interaction of the SN ejecta with circumstellar matter (CSM) and an inherently aspherical explosion. Aspherical explosions are a common feature of slowly declining Type II (Type IIP) SNe. By contrast, SN 2017ahn showed low polarization not only in the photospheric phase but also in the radioactive tail phase. This low polarization in the tail phase, which has never before been observed in other Type IIP/L SNe, suggests that the explosion of SN 2017ahn was nearly spherical. These observations imply that Type IIL SNe have, at least, two different origins: they result from stars that have different explosion properties and/or different mass-loss processes. This fact might indicate that 13ej-like Type IIL SNe originate from a similar progenitor to those of Type IIP SNe accompanied by an aspherical CSM interaction, while 17ahn-like Type IIL SNe come from a more massive progenitor with less hydrogen in its envelope.
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| 35. |
- Pink, R. H., et al.
(författare)
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Theory of electronic structure and nuclear quadrupole interactions in the BF3-NH3 complex and methyl derivatives
- 2007
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Ingår i: Hyperfine Interactions. - : Springer Science and Business Media LLC. - 0304-3843 .- 1572-9540. ; 176:1-3, s. 39-44
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Tidskriftsartikel (refereegranskat)abstract
- Magnetic Hyperfine and Nuclear Quadrupole Interactions (HFI and NQI) are now important tools for characterization of systems of interest in materials research and industry. Boron-Trifluoride is an inorganic compound that is very important in this respect as a catalyst in chemical physics research and industry, forming complexes in the process with compounds like ammonia, water and methyl alcohol. The present paper deals with the BF3-NH3 complex and methyl derivatives BF3NHx(CH3)(3-x) for which we have studied the electronic structures, binding energies, and F-19* (I=5/2) nuclear quadrupole interactions using the first-principles Hartree-Fock-Roothaan procedure combined with electron correlation effects. Our results for the F-19* nuclear quadrupole coupling constant (e(2)qQ/h) in units of MHz compare well with experiment. Trends in the binding energies and NQI parameters between the complexes are discussed.
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| 36. |
- Arndt, Anton, 1968-, et al.
(författare)
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Editorial
- 2021
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Ingår i: Footwear Science. - : Taylor & Francis. - 1942-4280 .- 1942-4299. ; 13:SUP1, s. S1-S3
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 37. |
- Holmes, Emily A., et al.
(författare)
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Are there two qualitatively distinct forms of dissociation? : A review and some clinical implications
- 2005
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Ingår i: Clinical Psychology Review. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0272-7358 .- 1873-7811. ; 25:1, s. 1-23
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Forskningsöversikt (refereegranskat)abstract
- This review aims to clarify the use of the term 'dissociation' in theory, research and clinical practice. Current psychiatric definitions of dissociation are contrasted with recent conceptualizations that have converged on a dichotomy between two qualitatively different phenomena: 'detachment' and 'compartmentalization'. We review some evidence for this distinction within the domains of phenomenology, factor analysis of self-report scales and experimental research. Available evidence supports the distinction but more controlled evaluations are needed. We conclude with recommendations for future research and clinical practice, proposing that using this dichotomy can lead to clearer case formulation and an improved choice of treatment strategy. Examples are provided within Depersonalization Disorder, Conversation Disorder and Posttraumatic Stress Disorder (PTSD). (C) 2004 Elsevier Ltd. All rights reserved.
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| 38. |
- Jiang, Wen, et al.
(författare)
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Utilization of Partially Liquefied Bark for Production of Particleboards
- 2020
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Ingår i: Applied Sciences. - Basel, Switzerland : MDPI. - 2076-3417. ; 10:15, s. 1-14
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Tidskriftsartikel (refereegranskat)abstract
- Bark as a sawmilling residue can be used for producing value-added chemicals and materials. This study investigated the use of partially liquefied bark (PLB) for producing particleboard with or without synthetic adhesives. Maritime pine (Pinus pinaster Ait.) bark was partially liquefied in the presence of ethylene glycol and sulfuric acid. Four types of particleboard panels were prepared with a PLB content of 4.7%, 9.1%, 20%, and 33.3%, respectively. Another five types of particleboard panels were manufactured by using similar amounts of PLB and 10 wt.% of melamine–urea–formaldehyde (MUF) adhesives. Characterization of bark and solid residues of PLB was performed by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and automated vapor sorption (AVS). Mechanical and physical properties of the particleboard were tested according to the European standards EN 310 for determining modulus of elasticity and bending strength, EN 317 for determining thickness swelling after immersion in water, and EN 319 for determining internal bond strength. The results showed that the increase in PLB content improved the mechanical strength for the non-MUF boards, and the MUF-bonded boards with up to 20% of PLB met the requirements for interior uses in dry conditions according to EN 312. The non-MUF boards containing 33.3% of PLB and the MUF-bonded boards showed comparable thickness swelling and water absorption levels compared to the reference board.
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| 39. |
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| 40. |
- Liang, Kuo-Yun, et al.
(författare)
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The Impact of Heterogeneity and Order in Heavy Duty Vehicle Platooning Networks
- 2011
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Konferensbidrag (refereegranskat)abstract
- It is formally known that by establishing a heavy duty vehicle platoon, the fuel consumption is reduced for the follower vehicle due to the lower air drag. However, it is not clear how the platoon should be formed with respect to the heavy duty vehicle properties. String stability is a well discussed issue in vehicle platooning. However, each vehicle’s properties have to be taken into consideration when analyzing the platoon system. In this paper, we analyze one property of heavy duty vehicles − the mass. The results show that the robustness is influenced by the order and physical characteristics of the vehicles in the platoon. When utilizing identical PID controllers for all vehicles in the platoon, it is better to arrange the heaviest vehicle first with decreasing mass order when considering the platoon behavior. However, in reality it is difficult to start rearranging a platoon in the middle of a highway and it would also require V2Vcommunication. A controller is often optimized for a particular configuration set that can cause slinky effects to the platoon. Therefore, a mass-dependent PID controller is introduced to establish a better platoon behavior for heavy duty vehicles. The results show no slinky effects regardless of the vehicle order in the platoon.
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| 41. |
- Liang, Kuo-Yun, et al.
(författare)
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The Influence of Traffic on Heavy-Duty Vehicle Platoon Formation
- 2015
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Konferensbidrag (refereegranskat)abstract
- Heavy-duty vehicle (HDV) platooning is a mean to significantly reduce the fuel consumption for the trailing vehicle. By driving close to the vehicle in front, the air drag is reduced tremendously. Due to each HDV being assigned with different transport missions, platoons will need to be frequently formed, merged, and split. Driving on the road requires interaction with surrounding traffic and road users, which will influence how well a platoon can be formed. In this paper, we study how traffic may affect a merging maneuver of two HDVs trying to form a platoon. We simulate this for different traffic densities and for different HDV speeds. Even on moderate traffic density, a platoon merge could be delayed with 20% compared to the ideal case with no traffic.
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| 42. |
- Maguire, K., et al.
(författare)
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Using late-time optical and near-infrared spectra to constrain Type Ia supernova explosion properties
- 2018
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 477:3, s. 3567-3582
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Tidskriftsartikel (refereegranskat)abstract
- The late-time spectra of Type Ia supernovae (SNe Ia) are powerful probes of the underlying physics of their explosions. We investigate the late-time optical and near-infrared spectra of seven SNe Ia obtained at the VLT with XShooter at >200 d after explosion. At these epochs, the inner Fe-rich ejecta can be studied. We use a line-fitting analysis to determine the relative line fluxes, velocity shifts, and line widths of prominent features contributing to the spectra ([Fe II], [Ni II], and [Co III]). By focusing on [Fe II] and [Ni II] emission lines in the similar to 7000-7500 angstrom region of the spectrum, we find that the ratio of stable [Ni II] to mainly radioactively produced [Fe II] for most SNe Ia in the sample is consistent with Chandrasekhar-mass delayed-detonation explosion models, as well as sub-Chandrasekhar mass explosions that have metallicity values above solar. The mean measured Ni/Fe abundance of our sample is consistent with the solar value. The more highly ionized [Co III] emission lines are found to be more centrally located in the ejecta and have broader lines than the [Fe II] and [Ni II] features. Our analysis also strengthens previous results that SNe Ia with higher Si II velocities at maximum light preferentially display blueshifted [Fe II] 7155 angstrom lines at late times. Our combined results lead us to speculate that the majority of normal SN Ia explosions produce ejecta distributions that deviate significantly from spherical symmetry.
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| 43. |
- Possidente, Luca, et al.
(författare)
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Derivation of a new temperature calculation formulation for heavily fire insulated steel cross-sections
- 2023
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Ingår i: Fire safety journal. - : Elsevier. - 0379-7112 .- 1873-7226. ; 141
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Tidskriftsartikel (refereegranskat)abstract
- Equations are given in the Eurocode standard EN 1993-1-2 on the estimation of temperature in insulated steel cross sections when assuming uniform steel section temperature, sometimes called a lumped heat capacity assumption. When deriving these equations the temperature of the exposed insulation surface is assumed equal the surrounding fire gas temperature. That is a simplification that may provide inaccurate results for heavily insulated steel sections, when the heat capacity of the insulation is considerably higher than that of the steel section. Therefore, a new lumped mass formulation suited for heavily insulated steel sections is proposed in this paper. It accounts for the heat transfer resistance between the fire and the insulation surface as well as for the heat capacity of the insulation. The accuracy of the predictions made with the proposed new formulation are compared with results of accurate 1-D finite element numerical analyses considering insulation materials with several combinations of thermal properties and thicknesses. Analyses with the proposed formulation is shown to yield accurate and generally on the safe side estimations of steel temperature in comparison to the finite element (FE) calculations. The new formulation is applicable to lightly as well as heavily insulated steel sections.
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| 44. |
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| 45. |
- Vorobiev, Andrei, 1963
(författare)
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Graphene and MMIC processing
- 2017
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Ingår i: Graphene Study 2017, Gothenburg, Sweden, 25-30 June, 2017.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 46. |
- Wahlund, Karl-Gustav
(författare)
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Flow field-flow fractionation: Critical overview.
- 2013
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Ingår i: Journal of Chromatography A. - : Elsevier BV. - 0021-9673. ; 1287, s. 97-112
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Forskningsöversikt (refereegranskat)abstract
- This overview regards some critical issues in performing flow field-flow fractionation (flow FFF, FlFFF, AF4, HF-FlFFF, HF5). It includes the channel thickness, void time, channel-flow parabolic profile, channel-flow velocity gradient, uniformity of the cross-flow, sample injection time, relaxation/focusing time, width of sample starting zone, retention level, theoretical and experimental zone broadening, hydrodynamic threshold immobilisation/re-mobilisation, sample loss and adsorption, membrane fouling, sample mass overloading, problems with symmetrical channels, non-spherical sample particles, and method development. Good method development practice (GMDP) and good fractogram practice (GFP) is suggested.
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| 47. |
- Ade, P. A. R., et al.
(författare)
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XXIV. Cosmology from Sunyaev-Zeldovich cluster counts
- 2016
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 594
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Tidskriftsartikel (refereegranskat)abstract
- We present cluster counts and corresponding cosmological constraints from the Planck full mission data set. Our catalogue consists of 439 clusters detected via their Sunyaev-Zeldovich (SZ) signal down to a signal-to-noise ratio of 6, and is more than a factor of 2 larger than the 2013 Planck cluster cosmology sample. The counts are consistent with those from 2013 and yield compatible constraints under the same modelling assumptions. Taking advantage of the larger catalogue, we extend our analysis to the two-dimensional distribution in redshift and signal-to-noise. We use mass estimates from two recent studies of gravitational lensing of background galaxies by Planck clusters to provide priors on the hydrostatic bias parameter, (1 - b). In addition, we use lensing of cosmic microwave background (CMB) temperature fluctuations by Planck clusters as an independent constraint on this parameter. These various calibrations imply constraints on the present-day amplitude of matter fluctuations in varying degrees of tension with those from the Planck analysis of primary fluctuations in the CMB; for the lowest estimated values of (1 b) the tension is mild, only a little over one standard deviation, while it remains substantial (3.7 sigma) for the largest estimated value. We also examine constraints on extensions to the base flat Lambda CDM model by combining the cluster and CMB constraints. The combination appears to favour non-minimal neutrino masses, but this possibility does little to relieve the overall tension because it simultaneously lowers the implied value of the Hubble parameter, thereby exacerbating the discrepancy with most current astrophysical estimates. Improving the precision of cluster mass calibrations from the current 10%-level to 1% would significantly strengthen these combined analyses and provide a stringent test of the base Lambda CDM model.
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| 48. |
- Antonioli, Roberto Pinto, et al.
(författare)
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Decentralized User Scheduling for Rate-Constrained Sum-Utility Maximization in the MIMO IBC
- 2020
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Ingår i: IEEE Transactions on Communications. - : Institute of Electrical and Electronics Engineers (IEEE). - 0090-6778 .- 1558-0857. ; 68:10, s. 6215-6229
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Tidskriftsartikel (refereegranskat)abstract
- While the problems of sum-rate maximization and sum-power minimization subject to quality of service (QoS) constraints in the multiple input multiple output interference broadcast channel (MIMO IBC) have been widely studied, most of the proposed solutions have neglected the user scheduling aspect assuming that a feasible set of users has been previously selected. However, ensuring QoS for each user in the MIMO IBC involves the joint optimization of transmit/receive beamforming vectors, transmit powers, and user scheduling variables. To address the full problem, we propose a novel formulation of a rate-constrained sum-utility maximization problem which allows to either deactivate users or minimize the QoS degradation for some scheduled users in infeasible scenarios. Remarkably, this is achieved avoiding the complexity of traditional combinatorial formulations, but rather by introducing a novel expression of the QoS constraints that allows to solve the problem in a continuous domain. We propose centralized and decentralized solutions, where the decentralized solutions focus on practical design and low signaling overhead. The proposed solutions are then compared with benchmarking algorithms, where we show the effectiveness of the joint scheduling and transceiver design as well as the flexibility of the proposed solution performing advantageously in several MIMO IBC scenarios.
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| 49. |
- Davies, Peter A., et al.
(författare)
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The interaction between topography and a nonlinearly stratified rotating fluid
- 1982
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Ingår i: Physics of fluids. - : AIP Publishing. - 1070-6631 .- 1089-7666 .- 0031-9171. ; 25:11, s. 1931-1934
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Tidskriftsartikel (refereegranskat)abstract
- Laboratory experiments have been conducted in which a spherical solid obstacle has been towed steadily through a thermally stratified rotating fluid in order to determine the effects of the density‐profile shape upon the attenuation with height of the disturbance produced by the obstacle. The existence of a cutoff level in the fluid beyond which the disturbance is not detected is illustrated, and the dependence of this level upon local variations in density profile is studied. Measurements of velocity above and behind the obstacle are reported.
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| 50. |
- Fallqvist, Björn, 1985-
(författare)
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Implementing cell contractility in filament-based cytoskeletal models
- 2016
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Ingår i: Cytoskeleton. - : John Wiley & Sons. - 1949-3584. ; 73:2, s. 93-106
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- Cells are known to respond over time to mechanical stimuli, even actively generating force at longer times. In this paper, a microstructural filament-based cytoskeletal network model is extended to incorporate this active response, and a computational study to assess the influence on relaxation behaviour was performed. The incorporation of an active response was achieved by including a strain energy function of contractile activity from the cross-linked actin filaments. A four-state chemical model and strain energy function was adopted, and generalisation to three dimensions and the macroscopic deformation field was performed by integration over the unit sphere. Computational results in MATLAB and ABAQUS/Explicit indicated an active cellular response over various time-scales, dependent on contractile parameters. Important features such as force generation and increasing cell stiffness due to prestress are qualitatively predicted. The work in this paper can easily be extended to encompass other filament-based cytoskeletal models as well.
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