| 41. |
- Engvall, Christer, et al.
(författare)
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Can myocardial strain differentiate hypertrophic from infiltrative etiology of a thickened septum?
- 2011
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Ingår i: Echocardiography. - : Wiley. - 0742-2822 .- 1540-8175. ; 28:4, s. 408-415
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Tidskriftsartikel (refereegranskat)abstract
- Septal systolic strain measurements showed reduced longitudinal function but its localized nature failed to demonstrate radial disturbances in patients with pathologically thickened septum. No difference was found in systolic strain between patients according to the etiology of septal thickness. This limitation might be either technical or is explained by the maintained radial function in all patient groups.
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| 42. |
- Eriksson, Anders, et al.
(författare)
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RPC-LAP : The Rosetta Langmuir probe instrument
- 2007
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Ingår i: Space Science Reviews. - : Springer Science and Business Media LLC. - 0038-6308 .- 1572-9672. ; 128:04-jan, s. 729-744
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Forskningsöversikt (refereegranskat)abstract
- The Rosetta dual Langmuir probe instrument, LAP, utilizes the multiple powers of a pair of spherical Langmuir probes for measurements of basic plasma parameters with the aim of providing detailed knowledge of the outgassing, ionization, and subsequent plasma processes around the Rosetta target comet. The fundamental plasma properties to be studied are the plasma density, the electron temperature, and the plasma flow velocity. However, study of electric fields up to 8 kHz, plasma density fluctuations, spacecraft potential, integrated UV flux, and dust impacts is also possible. LAP is fully integrated in the Rosetta Plasma Consortium (RPC), the instruments of which together provide a comprehensive characterization of the cometary plasma.
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| 43. |
- Eriksson, Anders, et al.
(författare)
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Temaintro: Aristoteles Retoriken
- 2014
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Ingår i: Rhetorica Scandinavica. - 1397-0534. ; 68, s. 5-7
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Tidskriftsartikel (refereegranskat)abstract
- Aristoteles Retoriken utkom 2012 i svensk översättning av Johanna Akujärvi. Därmed finns den nu – äntligen, frestas man att säga – tillgänglig på alla de tre skandinaviska språken: Thure Hastrups danska översättning utkom 1983 och Tormod Eides norska år 2006. Det betyder att skandinaviska läsare nu kan möta en av retorikämnets viktigaste utgångspunkter på sitt modersmål. Att Rhetorica Scandinavica däremot ägnar ett särskilt temanummer åt texten skulle kanske kunna uppfattas som både yrvaket och alltför sent: är inte denna snart två tusen fyra hundra år gamla text passé och överspelad, en antikvarisk relik som borde ersättas med nyare teorier som bättre lämpar sig för 2000-talets multimediala kommunikationssituation? Och har den inte – trots avsaknaden av äldre översättningar – redan haft ett så monumentalt inflytande på skandinavisk retorikundervisning och -forskning att ett särskilt temanummer verkar som ett slags akademiskt insparkande av redan längesedan bortmonterade dörrar? Vi anser inte det.
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| 44. |
- Forslund, Anders, et al.
(författare)
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Flykting- och anhöriginvandrades etablering på den svenska arbetsmarknaden, IFAU Rapport 2017:14
- 2017
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Vi beskriver arbetsmarknadsetablering och integration i Sverige på kort och lång sikt för invandrare från länder utanför västvärlden. Analysen omfattar huvudsakligen flykting- och anhöriginvandring under perioden 1990–2014. Mönstren för första kontakter med och etablering på arbetsmarknaden varierar med konjunkturläget, ursprungsland och med andra bakgrundsfaktorer. Men det huvudsakliga budskapet är att inträdesprocessen är långsam och att sysselsättning och inkomster av arbete även på lång sikt är lägre för invandrade relativt genomsnittet i arbetskraften i stort. Mönstren är på sikt påtagligt stabila för personer som kommit under olika tidsperioder och förutsättningar. Antalet jobb före det ”första riktiga” arbetsmarknadsinträdet är begränsat, och den första arbetsgivarkontakten är för många en väg till en mer stabil anställning. De första jobben återfinns jämförelsevis ofta i små låglöneföretag, som över tid koncentrerats mer till tjänstesektorn. Vi diskuterar också tänkbara effekter av olika politiska reformer och insatser.
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| 45. |
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| 46. |
- Graham, Daniel B., et al.
(författare)
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Enhanced Escape of Spacecraft Photoelectrons Caused by Langmuir and Upper Hybrid Waves
- 2018
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Ingår i: Journal of Geophysical Research - Space Physics. - : AMER GEOPHYSICAL UNION. - 2169-9380 .- 2169-9402. ; 123:9, s. 7534-7553
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Tidskriftsartikel (refereegranskat)abstract
- The spacecraft potential is often used to infer rapid changes in the thermal plasma density. The variations in spacecraft potential associated with large-amplitude Langmuir and upper hybrid waves are investigated with the Magnetospheric Multiscale (MMS) mission. When large-amplitude Langmuir and upper hybrid waves are observed, the spacecraft potential increases. The changes in spacecraft potential are shown to be due to enhanced photoelectron escape from the spacecraft when the wave electric fields reach large amplitude. The fluctuations in spacecraft potential follow the envelope function of the Langmuir and upper hybrid waves. Comparison with the high-resolution electron moments shows that the changes in spacecraft potential associated with the waves are not due to density perturbations. Indeed, using the spacecraft potential as a density probe leads to unphysically large density fluctuations. In addition, the changes in spacecraft potential are shown to increase as density decreases: larger spacecraft potential changes are observed in the magnetosphere, than in the magnetosheath and solar wind. These results show that external electric fields can lead to unphysical results when the spacecraft potential is used as a density probe. The results suggest that fluctuations in the spacecraft potential alone cannot be used to determine whether nonlinear processes associated with Langmuir and upper hybrid waves, such as the ponderomotive force and three-wave decay, are occurring.
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| 47. |
- Gustafsson, Ulf, 1976-, et al.
(författare)
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Apical circumferential motion of the right and the left ventricles in healthy subjects described with speckle tracking
- 2008
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Ingår i: Journal of the American Society of Echocardiography. - : Elsevier BV. - 0894-7317 .- 1097-6795. ; 21:12, s. 1326-1330
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Tidskriftsartikel (refereegranskat)abstract
- Background The aim of this study was to determine whether right ventricular (RV) apical rotation could be of importance in RV function and compare this with left ventricular (LV) apical rotation. Methods Short-axis images at the apical level of both ventricles were simultaneously recorded in 14 healthy subjects (mean age, 62 ± 11 years). Results There was a significant difference in mean rotation between the two ventricles in the time interval between 50% of ejection and aortic valve closure (P < .05). At aortic valve closure, LV rotation was 10.9 ± 4.8° counterclockwise, and RV rotation was 1.1 ± 5.8° clockwise. The anterior and inferior parts of the right ventricle rotated in opposite directions toward the septum. The septal segments of both ventricles rotated inferiorly, thus likely reducing interventricular stress. Conclusion This study showed clear differences in apical rotation between the two ventricles. Whereas the left ventricle displayed uniform rotation, the right ventricle showed heterogeneous rotation, resulting overall in almost no rotation but in a “tightening belt” motion.
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| 48. |
- Gustafsson, Ulf, 1976-, et al.
(författare)
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Assessment of regional rotation patterns improves the understanding of the systolic and diastolic left ventricular function : an echocardiographic speckle-tracking study in healthy individuals
- 2009
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Ingår i: European Journal of Echocardiography. - : Oxford University Press (OUP). - 1525-2167 .- 1532-2114. ; :10, s. 56-61
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Tidskriftsartikel (refereegranskat)abstract
- AIM To elucidate the complexity of left ventricular motion throughout the cardiac cycle, we studied regional rotation in detail. METHODS AND RESULTS: Regional rotation in six subdivisions of the circumference at three levels was studied by using speckle-tracking echocardiography in 40 healthy subjects. At the basal level the inferoseptal segments rotated significantly more clockwise during systole than the opposing anterolateral segments. At the papillary level the inferoseptal segments differed significantly from the anterolateral segments, where the inferoseptal segments rotated clockwise and the anterolateral segments rotated counter-clockwise. The apical level showed significant difference in regional rotation only at aortic valve opening. In early systole, untwist before the main systolic twist was seen at the basal and apical levels; however, the duration of the basal untwist was much longer than that of the apical. The diastolic phases of rotation at the basal and apical levels matched the different filling phases. CONCLUSION: Large regional differences in rotation are present at the basal and papillary levels in healthy subjects. The diastolic untwist matches the phases of both the E-wave and A-wave and seems to be related with intraventricular pressure differences, indicating that untwist plays an important role in the filling of the ventricle.
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| 49. |
- Gustafsson, Ulf, 1976-, et al.
(författare)
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The effect of acute myocardial ischemia on the rotation axis of the left ventricle
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Introduction: We have developed a method to assess the axis around which the left ventricle (LV) rotates. The aim was to assess the effect of acute regional ischemia on the otation axis. Method: Mid‐LAD occlusion was induced in six anesthetised pigs and echocardiographic images were recorded at baseline and after LAD occlusion. The rotation axis was calculated at three different levels of the LV throughout the cardiac cycle. Results: The direction of the rotation axis was significantly changed (p<0.01) after LAD occlusion, being directed towards the ischemic area. AV‐plane displacement was significantly reduced (p<0.05) during ischemia. No significant difference in twist or otation amplitudes was found. Conclusion: This new method of assessing rotational function seems as sensitive as AV‐plane displacement and superior to traditional rotation and twist parameters in detecting dysfunction in acute ischemic myocardium. The rotation axis method has the advantage of potentially identifying areas with dysfunction.
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| 50. |
- Gustafsson, Ulf, 1976-, et al.
(författare)
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The rotation axis of the left ventricle : a new concept derived from ultrasound data in healthy individuals
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Introduction: The axis around which the left ventricle (LV) rotates has never previously been described. The aim was to develop a method to calculate the spatial motion of the rotation axis throughout the cardiac cycle. Method: By constructing a model of the LV, based on dimensions and rotation values at the basal, mid ventricular and apical levels, a rotation axis could be calculated at each level in 39 healthy subjects. The transition plane, defined as the level without rotation, where basal and apical rotation meet was also calculated. Results: The rotation axis was not congruent to the longitudinal axis of the LV at any time point. A significant and specific mean direction for each of the rotation axes for the majority of the tested time points displayed a physiological pattern. Conclusion: This new method introduces a new concept in cardiac function and provides further insight into the complexity of LV mechanics.
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