| 1. |
- de Jong, R. S., et al.
(författare)
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4MOST : Project overview and information for the First Call for Proposals
- 2019
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Ingår i: The Messenger. - : European Southern Observatory. - 0722-6691. ; 175, s. 3-11
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- We introduce the 4-metre Multi-Object Spectroscopic Telescope (4MOST), a new high-multiplex, wide-field spectroscopic survey facility under development for the four-metre-class Visible and Infrared Survey Telescope for Astronomy (VISTA) at Paranal. Its key specifications are: a large field of view (FoV) of 4.2 square degrees and a high multiplex capability, with 1624 fibres feeding two low-resolution spectrographs (R = λ/Δλ ~ 6500), and 812 fibres transferring light to the high-resolution spectrograph (R ~ 20 000). After a description of the instrument and its expected performance, a short overview is given of its operational scheme and planned 4MOST Consortium science; these aspects are covered in more detail in other articles in this edition of The Messenger. Finally, the processes, schedules, and policies concerning the selection of ESO Community Surveys are presented, commencing with a singular opportunity to submit Letters of Intent for Public Surveys during the first five years of 4MOST operations.
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| 2. |
- Sigmundsson, F., et al.
(författare)
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Segmented lateral dyke growth in a rifting event at Bardarbunga volcanic system, Iceland
- 2015
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Ingår i: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 517:7533
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Tidskriftsartikel (refereegranskat)abstract
- Crust at many divergent plate boundaries forms primarily by the injection of vertical sheet-like dykes, some tens of kilometres long(1). Previous models of rifting events indicate either lateral dyke growth away from a feeding source, with propagation rates decreasing as the dyke lengthens(2-4), or magma flowing vertically into dykes from an underlying source(5,6), with the role of topography on the evolution of lateral dykes not clear. Here we show how a recent segmented dyke intrusion in the Bardarbunga volcanic system grew laterally for more than 45 kilometres at a variable rate, with topography influencing the direction of propagation. Barriers at the ends of each segment were overcome by the build-up of pressure in the dyke end; then a new segment formed and dyke lengthening temporarily peaked. The dyke evolution, which occurred primarily over 14 days, was revealed by propagating seismicity, ground deformation mapped by Global Positioning System(GPS), interferometric analysis of satellite radar images (InSAR), and graben formation. The strike of the dyke segments varies from an initially radial direction away from the Bardarbunga caldera, towards alignment with that expected from regional stress at the distal end. A model minimizing the combined strain and gravitational potential energy explains the propagation path. Dyke opening and seismicity focused at the most distal segment at any given time, and were simultaneous with magma source deflation and slow collapse at the Bardarbunga caldera, accompanied by a series of magnitude M > 5 earthquakes. Dyke growth was slowed down by an effusive fissure eruption near the end of the dyke. Lateral dyke growth with segment barrier breaking by pressure build-up in the dyke distal end explains how focused upwelling of magma under central volcanoes is effectively redistributed over long distances to create new upper crust at divergent plate boundaries.
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| 3. |
- Johannesdottir, Hera, et al.
(författare)
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Favourable long-term outcome after coronary artery bypass grafting in a nationwide cohort
- 2017
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Ingår i: Scandinavian Cardiovascular Journal. - : Informa UK Limited. - 1401-7431 .- 1651-2006. ; 51:6, s. 327-333
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Tidskriftsartikel (refereegranskat)abstract
- Objectives. In a nationwide cohort, we analyzed long-term outcome following coronary artery bypass grafting, using the combined strategy of left internal mammary artery to the left anterior descending artery and saphenous vein as secondary graft to other coronary targets. Methods. 1,507 consecutive patients that underwent myocardial revascularization during 2001-2012 in Iceland. Mean follow-up was 6.8 years. Major adverse cardiac and cerebrovascular events were depicted using the Kaplan-Meier method. Cox-regression was used to define risk factors. Relative survival was estimated by comparing overall survival to the survival of Icelanders of the same age and gender. Results. Mean age was 66 years, 83% were males, mean EuroSCOREst was 4.5, and 23% of the procedures were performed off-pump. At 5 years, 19.7% had suffered a major adverse cardiac or cerebrovascular event, 4.5% a stroke, 2.2% myocardial infarction, and 6.2% needed repeat revascularization. Overall 5-year survival was 89.9%, with a relative survival of 0.990. Independent predictors of major adverse cardiac and cerebrovascular events were left ventricular ejection fraction 30%, a previous history of percutaneous coronary intervention, chronic obstructive lung disease, chronic kidney disease, diabetes, and old age. The same variables and an earlier year of operation were predictors of long-term mortality. Conclusions. The long-term outcome following myocardial revascularization, using the left internal mammary artery and the great saphenous vein as conduits, is favourable and improving. This is reflected by the 5-year survival of 89.9%, deviating minimally from the survival rate of the general Icelandic population, together with a freedom from major adverse cardiac and cerebrovascular events of 80.3%.
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| 4. |
- Garoarsdottir, Helga Run, et al.
(författare)
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Árangur kransæðahjáveituaðgerða hjá konum á Íslandi
- 2018
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Ingår i: Laeknabladid. - : LAEKNAFELAG ISLANDS-ICELANDIC MEDICAL ASSOC. - 0023-7213 .- 1670-4959. ; 104:7-8, s. 335-340
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Tidskriftsartikel (refereegranskat)abstract
- InngangurMarkmið þessarar rannsóknar var að bera saman árangur kransæða-hjáveituaðgerða hjá konum og körlum á Íslandi með áherslu á snemm- og síðkomna fylgikvilla, 30 daga dánartíðni og langtímalifun.Efniviður og aðferðirAfturskyggn rannsókn á öllum sjúklingum sem gengust undir kransæðahjáveituaðgerð á Íslandi á árunum 2001-2013. Upplýsingar fengust úr sjúkraskrám og Dánarmeinaskrá Embættis landlæknis. Fylgikvillum var skipt í snemm- og síðkomna fylgikvilla og heildarlif-un reiknuð með aðferð Kaplan-Meier. Fjölþátta aðhvarfsgreining var notuð til að meta forspárþætti dauða innan 30 daga og Cox aðhvarfs-greining til að meta forspárþætti verri langtímalifunar. Meðaleftirfylgd var 6,8 ár. NiðurstöðurAf 1755 sjúklingum voru 318 konur (18%). Meðalaldur þeirra var fjórum árum hærri en karla (69 ár á móti 65 árum, p<0,001), þær höfðu oftar sögu um háþrýsting (72% á móti 64%, p=0,009) og EuroSCOREst þeirra var hærra (6,1 á móti 4,3, p<0,001). Hlutfall annarra áhættu-þátta eins og sykursýki var hins vegar sambærilegt, líkt og útbreiðsla kransæðasjúkdóms. Alls létust 12 konur (4%) og 30 karlar (2%) innan 30 daga frá aðgerð en munurinn var ekki marktækur (p=0,08). Tíðni snemmkominna fylgikvilla, bæði minniháttar (53% á móti 48% p=0,07) og alvarlegra (13% á móti 11%, p=0,2), var sambærileg. Fimm árum frá aðgerð var lifun kvenna 87% borin saman við 90% hjá körlum (p=0,09). Þá var tíðni síðkominna fylgikvilla sambærileg hjá konum og körlum 5 árum frá aðgerð (21% á móti 19%, p=0,3). Kvenkyn reyndist hvorki sjálfstæður forspárþáttur 30 daga dánartíðni (OR 0,99; 95%-ÖB: 0,97-1,01) né verri lifunar (HR 1,08; 95%-ÖB: 0,82-1,42).Ályktun Mun færri konur en karlar gangast undir kransæðahjáveituaðgerð á Íslandi og eru þær fjórum árum eldri þegar kemur að aðgerð. Árangur kransæðahjáveitu er góður hjá konum líkt og körlum, en 5 árum eftir aðgerð eru 87% kvenna á lífi.
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| 5. |
- Gumaelius, Lena, et al.
(författare)
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Outreach initiatives operated by universities for increasing interest in science and technology
- 2016
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Ingår i: European Journal of Engineering Education. - : Taylor & Francis Group. - 0304-3797 .- 1469-5898. ; , s. 1-34
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Tidskriftsartikel (refereegranskat)abstract
- Since the 1990s, the low number of students choosing to study science and technology in higher education has been on the societal agenda and many initiatives have been launched to promote awareness regarding career options. The initiatives particularly focus on increasing enrolment in the engineering programmes. This article describes and compares eight European initiatives that have been established and operated by universities (and in some cases through collaboration with other actors in society). Each initiative is summarised in a short essay that discusses motivation, organisation, pedagogical approach, and activities. The initiatives are characterised by comparing the driving forces behind their creation, how the initiative activities relate to the activities at the university, size based on the number of participants and cost per participant and pedagogical framework. There seem to be two main tracks for building outreach activities, one where outreach activities are based on the university's normal activities, and one where outreach activities are designed specifically for the visiting students.
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