| 1. |
|
|
| 2. |
- Abrahamsson, Johan, 1977-, et al.
(författare)
-
A Fully Levitated Cone-Shaped Lorentz-Type Self-Bearing Machine With Skewed Windings
- 2014
-
Ingår i: IEEE transactions on magnetics. - 0018-9464 .- 1941-0069. ; 50:9
-
Tidskriftsartikel (refereegranskat)abstract
- Brushless dc coreless electric machines with double-rotor and single-stator configuration have very low losses, since the return path of the magnetic flux rotates with the permanent magnets. The eddy-current loss in the stator is additionally very small due to the lack of iron, making it ideal for kinetic energy storage. This paper presents a design for self-bearing rotor suspension, achieved by placing the stator windings skewed on a conical surface. A mathematical analysis of the force from a skewed winding confined to the surface of a cone was found. The parametric analytical expressions of the magnitude and direction of force and torque were verified by finite-element method simulations for one specific geometry. A dynamic model using proportional-integral-differential control was implemented in MATLAB/Simulink, and the currents needed for the self-bearing effect were found by solving an underdetermined system of linear equations. External forces, calculated from acceleration measurements from a bus in urban traffic, were added to simulate the dynamic environment of an electrical vehicle.
|
|
| 3. |
- Ali, Hasan, 1985-, et al.
(författare)
-
An electron energy loss spectrometer based streak camera for time resolved TEM measurements
- 2017
-
Ingår i: Ultramicroscopy. - : Elsevier BV. - 0304-3991 .- 1879-2723. ; 176, s. 5-10
-
Tidskriftsartikel (refereegranskat)abstract
- We propose an experimental setup based on a streak camera approach inside an energy filter to measure time resolved properties of materials in the transmission electron microscope (TEM). In order to put in place the streak camera, a beam sweeper was built inside an energy filter. After exciting the TEM sample, the beam is swept across the CCD camera of the filter. We describe different parts of the setup at the example of a magnetic measurement. This setup is capable to acquire time resolved diffraction patterns, electron energy loss spectra (EELS) and images with total streaking times in the range between 100 ns and 10 μs.
|
|
| 4. |
- Bendel, Olof, et al.
(författare)
-
Reappearance of hippocampal CA1 neurons after ischemia is associated with recovery of learning and memory
- 2005
-
Ingår i: Journal of Cerebral Blood Flow and Metabolism. - : Sage Publications. - 0271-678X .- 1559-7016. ; 25:12, s. 1586-1595
-
Tidskriftsartikel (refereegranskat)abstract
- The pyramidal neurons of the hippocampal CA1 region are essential for cognitive functions such as spatial learning and memory, and are selectively destroyed after cerebral ischemia. To analyze whether degenerated CA1 neurons are replaced by new neurons and whether such regeneration is associated with amelioration in learning and memory deficits, we have used a rat global ischemia model that provides an almost complete disappearance (to approximately 3% of control) of CA1 neurons associated with a robust impairment in spatial learning and memory at two weeks after ischemia. We found that transient cerebral ischemia can evoke a massive formation of new neurons in the CA1 region, reaching approximately 40% of the original number of neurons at 90 days after ischemia (DAI). Co-localization of the mature neuronal marker neuronal nuclei with 5-bromo-2'-deoxyuridine in CA1 confirmed that neurogenesis indeed had occurred after the ischemic insult. Furthermore, we found increased numbers of cells expressing the immature neuron marker polysialic acid neuronal cell adhesion molecule in the adjacent lateral periventricular region, suggesting that the newly formed neurons derive from this region. The reappearance of CA1 neurons was associated with a recovery of ischemia-induced impairments in spatial learning and memory at 90 DAI, suggesting that the newly formed CA1 neurons restore hippocampal CA1 function. In conclusion, these results show that the brain has an endogenous capacity to form new nerve cells after injury, which correlates with a restoration of cognitive functions of the brain.
|
|
| 5. |
|
|
| 6. |
- Bugaytsova, Jeanna, et al.
(författare)
-
pH regulated H. pylori adherence : implications for persistent infection and disease
-
Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Helicobacter pylori’s BabA adhesin binds strongly to gastric mucosal ABH/Leb glycans on the stomach epithelium and overlying mucus, materials continuously shed into the acidic gastric lumen. Here we report that this binding is acid labile, acid inactivation is fully reversible; and acid lability profiles vary with BabA sequence and correlate with disease patterns. Isogenic H. pylori strains from the gastric antrum and more acidic corpus were identified that differed in acid lability of receptor binding and in sequence near BabA’s carbohydrate binding domain. We propose that reversible acid inactivation of receptor binding helps H. pylori avoid clearance by mucosal shedding, and that strain differences in acid lability affect tissue tropism and the spectrum of associated gastric diseases.
|
|
| 7. |
-
Grupphandledning : Forskning och erfarenheter från olika verksamhetsområden
- 2010. - 1:1
-
Samlingsverk (redaktörskap) (övrigt vetenskapligt/konstnärligt)abstract
- Handledning i grupp tillämpas idag inom ett flertal verksamhetsområden, ofta i syfte att spara pengar, men även för att avhjälpa bristen på handledare. Det finns då en uppenbar risk att grupphandledning blir individuell handledning i turordning snarare än att man faktiskt använder sig av de grupprocesser som uppstår och verkar i en grupp. Grupphandledningens möjligheter och utmaningar belyses inom olika verksamheter utifrån såväl ett ”praktikerperspektiv” som utifrån aktuell forskning och teori inom området.Bokens författare har alla mångårig erfarenhet av såväl praktisk tillämpning som forskning inom handlednings- och grupp-/organisationsområdet. Vardagliga exempel på frågeställningar som brukar aktualiseras inom grupphandledningens olika tillämpningsområden har tagits som utgångspunkt.Boken vänder sig till läsare som är intresserade av och arbetar med handledning i grupp inom områden som vård, omsorg, socialt arbete, pedagogik, psykoterapi, konsultation, organisation, ledarskap och forskning.
|
|
| 8. |
|
|
| 9. |
- Jern, Stefan, et al.
(författare)
-
Handledaren, gruppen och organisationen
- 2010
-
Ingår i: Grupphandledning: Forskning och erfarenheter från olika verksamhetsområden.. - 9789144060699 ; , s. 27-47
-
Bokkapitel (refereegranskat)abstract
- This chapter argues for the importance for basic areas knowledge in group psychology as prerequisites for supervisors working in group formats. The tasks of the supervisor are divided into a) task related work, b) maintenance work, c)individuallly oriented work and d) organizational work. The unique charactistics of supervision groups are discussed. A number of useful models concerning group formation and group development are introduced and relevnt empirical research on group development and group climate is presented.
|
|
| 10. |
- Kilbo Edlund, Karl, et al.
(författare)
-
Long-term ambient air pollution and coronary atherosclerosis : results from the Swedish SCAPIS study
- 2024
-
Ingår i: Atherosclerosis. - : Elsevier. - 0021-9150 .- 1879-1484.
-
Tidskriftsartikel (refereegranskat)abstract
- Background and aims: Despite firm evidence for an association between long-term ambient air pollution exposure and cardiovascular morbidity and mortality, results from epidemiological studies on the association between air pollution exposure and atherosclerosis have not been consistent. We investigated associations between long-term low-level air pollution exposure and coronary atherosclerosis.Methods: We performed a cross-sectional analysis in the large Swedish CArdioPulmonary bioImaging Study (SCAPIS, n = 30 154), a random general population sample. Concentrations of total and locally emitted particulate matter <2.5 μm (PM2.5), <10 μm (PM10), and nitrogen oxides (NOx) at the residential address were modelled using high-resolution dispersion models. We estimated associations between air pollution exposures and segment involvement score (SIS), coronary artery calcification score (CACS), number of non-calcified plaques (NCP), and number of significant stenoses, using ordinal regression models extensively adjusted for potential confounders.Results: Median 10-year average PM2.5 exposure was 6.2 μg/m3 (range 3.5–13.4 μg/m3). 51 % of participants were women and 51 % were never-smokers. None of the assessed pollutants were associated with a higher SIS or CACS. Exposure to PM2.5 was associated with NCP (adjusted OR 1.34, 95 % CI 1.13, 1.58, per 2.05 μg/m3). Associations with significant stenoses were inconsistent.Conclusions: In this large, middle-aged general population sample with low exposure levels, air pollution was not associated with measures of total burden of coronary atherosclerosis. However, PM2.5 appeared to be associated with a higher prevalence of non-calcified plaques. The results suggest that increased risk of early-stage atherosclerosis or rupture, but not increased total atherosclerotic burden, may be a pathway for long-term air pollution effects on cardiovascular disease.
|
|
