| 1. |
- 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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| 3. |
- Boman, Tomas
(författare)
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Situationen på den svenska arbetsmarknaden för personer med funktionsnedsättning : en sekundäranalys om sysselsättning, yrkesnivå, diskriminering, stöd och anpassning för personer med olika typer av funktionsnedsättning
- 2019
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The overall aim of this thesis is to explore how the labour market situation appears to persons with different types of disabilities in Sweden. Study I (n=4 359) examined the importance of the person’s type of disability for the possibility of having a job. Study II (n=3 396) examined whether there were differences in occupational attainment between persons with different types of disabilities and between persons with and without a disability (n=19 004). Study III (n=4 359) examined perceived discrimination in the workplace among persons with different types of disabilities. Study IV (n=2 268) examined whatsupport and adaptation persons with different types of disabilities need in their actual workplace or to enter the labour market. In studies I–III the respondents were divided into six disability types, and in study IV the respondents were divided into four disability types.Overall, it can be concluded that a person’s type of disability is of importance for the situation in the labour market, where persons with psychological disabilities encounter barriers to a greater extent than other groups, both difficulties at the present workplace and difficulties entering the labour market. Further, they were subjected to discrimination and they expressed a great need for adaptations to acquire employment and at their actual workplace. It can also be concluded that there are discriminatory mechanisms against women, who have more difficulties than men in acquiring employment, and that men, despite lower education, can more easily progress in the labour market. It is suggested that, in order to achieve inclusion and recognition, factors in the environment, such as existing support systems, need to be changed and developed, and social prejudices vis-à-vis people with disabilities must also be addressed.
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| 4. |
- Krantz, Philip, 1984, et al.
(författare)
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Single-shot read-out of a superconducting qubit using a Josephson parametric oscillator
- 2016
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Ingår i: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723 .- 2041-1723. ; 7:11417
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Tidskriftsartikel (refereegranskat)abstract
- We propose and demonstrate a read-out technique for a superconducting qubit by dispersively coupling it with a Josephson parametric oscillator. We employ a tunable quarter wavelength superconducting resonator and modulate its resonant frequency at twice its value with an amplitude surpassing the threshold for parametric instability. We map the qubit states onto two distinct states of classical parametric oscillation: one oscillating state, with 185±15 photons in the resonator, and one with zero oscillation amplitude. This high contrast obviates a following quantum-limited amplifier. We demonstrate proof-of-principle, singleshot read-out performance, and present an error budget indicating that this method can surpass the fidelity threshold required for quantum computing.
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| 5. |
- Révay, Peter
(författare)
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Systemeringspaketet Syskon
- 1975
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Ingår i: Modern Datateknik. - 0026-7686.
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 9. |
- Kolbus, Daniel, et al.
(författare)
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Association between CD8+ T-cell subsets and cardiovascular disease
- 2013
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Ingår i: Journal of Internal Medicine. - : John Wiley & Sons. - 0954-6820 .- 1365-2796. ; 274:1, s. 41-51
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Tidskriftsartikel (refereegranskat)abstract
- Background The findings of experimental studies suggest that the immune system plays a key role in atherosclerosis, but the clinical importance of different immune cells in cardiovascular disease remains poorly characterized. In this study we investigated the association between CD8+ T cells and carotid disease as well as development of cardiovascular disease events. Methods The study cohort comprised 700 subjects from the cardiovascular arm of the Malmö Diet and Cancer Study. Peripheral blood mononuclear cells, obtained at the 1991–1994 baseline investigation and stored at −140 °C, were thawed and the different CD8+ T-cell populations analysed by flow cytometry. Baseline carotid intima–media thickness and stenosis were assessed by ultrasonography and clinical events were monitored through validated national registers. Results Subjects with a high fraction of CD8+ T cells were characterized by decreased cytokine release from activated leucocytes, metabolic signs of insulin resistance and increased incidence of coronary events; hazard ratios (95% confidence intervals) for the second and third tertiles of CD8+ T cells were 2.57 (1.16, 5.67) and 2.61 (1.19, 5,71), respectively, in a Cox proportional hazards regression model. Correlations were found between the fraction of CD8+CD25+ T cells and the degree of carotid stenosis (r = 0.11, P < 0.01), and between the CD8+CD56−IFN-γ+ T-cell fraction and the degree of stenosis (r = −0.18, P < 0.005). The association between CD8+CD56−IFN-γ+ T cells and carotid stenosis remained significant after controlling for major cardiovascular disease risk factors. Conclusion This study provides prospective clinical evidence for a role of CD8+ T cells in cardiovascular disease and suggests the existence of CD8+ T-cell subsets with different pathological functions.
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| 10. |
- Moradi, Farnaz, et al.
(författare)
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Optimizing DRX for Video delivery over LTE: Utilizing Channel Prediction and In-network caching
- 2017
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Ingår i: 15th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt), 2017. - 9783901882906
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Konferensbidrag (refereegranskat)abstract
- We jointly optimize Discontinuous Reception (DRX) cycle length and LTE scheduling to minimize mobile devices' energy usage for video delivery, utilising the now well-established potential to predict future channel conditions in cellular networks. Employing in-network caching, we set a strict buffer constraint which provides zero buffer underflow to improve Quality of Experience. Our study provides insight into the energy saving potential sophisticated DRX schemes hold, compared with the currently used static method. To this end, two novel DRX approaches are proposed and studied. The results show that more sophisticated DRX schemes (with variable DRX cycle length) can potentially save 69 percent energy for mobile devices, encouraging further research in the field.
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