306 research outputs found

    Nuovo sistema binario di stelle ellissoidali in Auriga: GUNVAG1(VSX 1500078)/New binary system of ellipsoidal stars in Auriga

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    Ellipsoidal variable stars (ELL) are binary systems with two stars deformed by the mutual gravitational attraction, that typically rotate around each other in short periods. We have discovered the variability of the binary star system called GUNVAG1 with AAVSO UID 000-BNJ-506/VSX 1500078, located in the Auriga constellation at coordinates J051227.25 +333449.8, and we have determined the characterizing parameters. GUNVAG1 resulted to be an ELL binary star system with a period of 0.358 days ≈ 8.6 hours. The distance of the GUNVAG1 system from Earth is 2220 ± 130 pc ≈ 7240 ± 430 l

    Minor amputation after revascularization in chronic limb-threatening ischemia: What is the optimal timing?

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    Objectives Patients with chronic limb-threatening ischemia (CLTI) have a high risk of lower limb amputation and loss of walking independence. Minor amputations play a key role in ensuring walking independence and they represent a challenge in terms of timing and level for vascular surgeons. A major cause of re-amputation is a defect in wound healing and a possible predictor of re-amputation for non-healing wounds could be the incorrect timing of minor amputation after revascularization. The lack of evidence in the literature leads to a wide variability of choices in clinical practice. The purpose of this study was to try to find the optimal timing analysing the risk of re-amputation in CLTI patients who have undergone successful revascularization and minor amputation focussing on timing of minor amputation.Methods We conducted a single centre retrospective analysis on a cohort of 151 patients consecutively admitted to our hospital for CLTI (Rutherford 5) between January 2014 and April 2022. All the enrolled patients underwent successful revascularization of lower limbs and a minor amputation for dry acral necrosis. The characteristics of the patients and the revascularization procedures were collected and analysed. Patients were divided into two groups based on the timing of minor amputation performed before (group 1) or after the day (group 2) that best predicts the risk of re-amputation according to a Receiver Operating Characteristic (ROC) curve analysis. The primary outcome of this study was the risk of re-amputation during the first 60 days of follow-up after a primary minor amputation, with revascularization still effective. The impact of the timing of minor amputation after revascularization, the type of revascularization and the presence of risk factors known to prolong the wound healing process were evaluated in a uni- and multi-variable logistic regression model.Results Systemic hypertension, and type of revascularization (i.e. open vs endovascular) were independent predictors of the risk of re-amputation at 60 days (HR 4.26, 95% CI 1.30-14.04, p = .017 and HR 2.35, 95% CI 1.16-4.78, p = .018, respectively). Moreover, time <= 14 days between revascularization and first amputation was associate with a clear, albeit not statistically significant, trend toward increased risk of re-amputation (HR 2.09, 95% CI 0.97-4.51, p = .06).Conclusions In a cohort of patients who underwent a successful revascularization for CLTI and a minor amputation for dry gangrene in the first 14 days after revascularization, a higher -although not significant-risk of re-amputation was reported. In this cohort of patients, a delayed demolitive procedure should be considered to allow better tissue perfusion and to reduce the risk of re-amputation

    Impact of the lower Jurassic Dunlin Group depositional elements on the Aurora CO<sub>2</sub> storage site, EL001, northern North Sea, Norway

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    Northern Lights is the CO2 transport and storage component of Longship, the Norwegian full-scale CCS project. Injection is planned into an under-explored sloping saline aquifer in the northern North Sea, the Johansen and Cook formations of the Lower Jurassic Dunlin Group. To bridge the information gap, well 31/5-7 (Eos) was drilled. The comprehensive dataset acquired was fundamental to interpret the depositional environment and determine the scale and spatial distribution of heterogeneities, as input to 3-D models aimed at improving storage resource assessment and understanding the injected CO2 plume behaviour over time. The interpreted gross depositional environments of the storage units are marginal- to shallow-marine, arranged in three successive fining-upwards intervals. The lower interval includes coastal deposits with mixed wave- and river influence, correlatable over a large distance, dominated by meso-scale heterogeneities. The middle interval records paralic deposits with a wave- and tidal- interplay generating higher vertical and lateral variability. The upper interval is interpreted as tidal-dominated, predominantly with cm-scale heterogeneities. The repeated fining-upwards trends are ideal for plume redistribution and efficient CO2 storage, and the reconstructed lateral depositional trends associated with generally good properties indicate a high storage potential. The Eos well data enabled building the properties distribution model, highlighting the importance of well control for storage evaluation.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Applied Geolog

    RAPID RESPONSE TO EXTRAORDINARY EVENTS: THE GAMMA-RAY FOLLOW UP (GFU) PLATFORM FOR ICECUBE

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    Parallel Flash Talk at the "XIX International Workshop on Neutrino Telescopes" on line - 18-26 February, 2021for the IceCube Collaboratio

    CERN Yellow Reports: Monographs, Vol. 4 (2020): LHC fixed target experiments: Report from the LHC Fixed Target Working Group of the CERN Physics Beyond Colliders Forum

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    Several fixed-target experiments at the LHC are being proposed and activelystudied. Splitting of beam halo from the core by means of a bent crystal com-bined with a second bent crystal after the target has been suggested in order tostudy magnetic and electric dipole moments of short-lived particles. A similarscheme without the second crystal or other schemes with more conventionalsolid or gas targets have been proposed to study hadronic matter and the quark-gluon plasma, as well as to provide inputs to cosmic ray physics. Most notably,an upgrade of the existing and already productive LHCb gas target (SMOG),which would make use of a storage cell, has been proposed, designed, andextensively reviewed. The implementation in LHCb of a polarised gas tar-get, based on the storage cell technique, was also discussed, motivated by thenucleon-spin study. The status of these proposals, their technical feasibilityand impacts on the LHC machine have been studied in the LHC Fixed TargetWorking Group of the Physics Beyond Collider forum at CERN. The statusand outcome of these studies are presented here
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