Digital Health : die Zukunft des Schweizer Gesundheitswesens

Digital Health ist in aller Munde. Egal ob nun von eHealth, mHealth, Big Data, Gesundheit 4.0 oder eben Digital Health gesprochen wird, die Chancen und Gefahren der digitalen Möglichkeiten beschäftigen die meisten Akteure unseres Gesundheitssystems. Aber wofür stehen eigentlich die zahlreichen neuen Begriffe? Wird Digital Health wirklich das Gesundheitswesen revolutionieren oder handelt es sich nur um einen weiteren Hype, der schon bald wieder vergessen sein wird? Der vorliegende Report schafft ein einheitliches Verständnis, beschreibt den aktuellen Stand aus der Managementperspektive und geht auf zukünftige Entwicklungen ein

Fixed-frequency operation of an island grid with multiple grid-forming inverters and GPS-based synchronisation

By using an external signal for the synchronisation, an island grid with grid-forming inverters (GFMs) can be operated at a constant frequency. The global positioning system (GPS) provides a periodic pulse with a suitable accuracy. This is used to define the grid frequency and a reference for the voltage phase angle. A digital counter in the control hardware determines the phase angle. The counter is reset by each pulse of the GPS. An active power-angle droop control leads to partial power sharing between the GFMs and reduces distortions caused by non-ideal synchronisation. Furthermore, the grid operator can adjust the voltage reference phasors of the GFMs to control the power flow in the grid. An island grid with two GFMs and a hydro power plant is studied in simulations. The investigated power system is an altered and simplified grid model of Suðuroy, in the Faroe Islands. The effects of a load connection and a distorted GPS synchronisation are studied. Stable operation of the power system using the fixed-frequency approach is demonstrated.© 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works

Keine Angst vor dem Blackout : Ein dezentral organisierter Schwarzstart ist machbar!

[no abstract available

Search for eccentric black hole coalescences during the third observing run of LIGO and Virgo

Despite the growing number of confident binary black hole coalescences observed through gravitational waves so far, the astrophysical origin of these binaries remains uncertain. Orbital eccentricity is one of the clearest tracers of binary formation channels. Identifying binary eccentricity, however, remains challenging due to the limited availability of gravitational waveforms that include effects of eccentricity. Here, we present observational results for a waveform-independent search sensitive to eccentric black hole coalescences, covering the third observing run (O3) of the LIGO and Virgo detectors. We identified no new high-significance candidates beyond those that were already identified with searches focusing on quasi-circular binaries. We determine the sensitivity of our search to high-mass (total mass M>70 M⊙) binaries covering eccentricities up to 0.3 at 15 Hz orbital frequency, and use this to compare model predictions to search results. Assuming all detections are indeed quasi-circular, for our fiducial population model, we place an upper limit for the merger rate density of high-mass binaries with eccentricities 0<e≤0.3 at 0.33 Gpc−3 yr−1 at 90\% confidence level

Search for gravitational-lensing signatures in the full third observing run of the LIGO-Virgo network

Gravitational lensing by massive objects along the line of sight to the source causes distortions of gravitational wave-signals; such distortions may reveal information about fundamental physics, cosmology and astrophysics. In this work, we have extended the search for lensing signatures to all binary black hole events from the third observing run of the LIGO--Virgo network. We search for repeated signals from strong lensing by 1) performing targeted searches for subthreshold signals, 2) calculating the degree of overlap amongst the intrinsic parameters and sky location of pairs of signals, 3) comparing the similarities of the spectrograms amongst pairs of signals, and 4) performing dual-signal Bayesian analysis that takes into account selection effects and astrophysical knowledge. We also search for distortions to the gravitational waveform caused by 1) frequency-independent phase shifts in strongly lensed images, and 2) frequency-dependent modulation of the amplitude and phase due to point masses. None of these searches yields significant evidence for lensing. Finally, we use the non-detection of gravitational-wave lensing to constrain the lensing rate based on the latest merger-rate estimates and the fraction of dark matter composed of compact objects

Digital Health : die Zukunft des Schweizer Gesundheitswesens

Digital Health ist in aller Munde. Egal ob nun von eHealth, mHealth, Big Data, Gesundheit 4.0 oder eben Digital Health gesprochen wird, die Chancen und Gefahren der digitalen Möglichkeiten beschäftigen die meisten Akteure unseres Gesundheitssystems. Aber wofür stehen eigentlich die zahlreichen neuen Begriffe? Wird Digital Health wirklich das Gesundheitswesen revolutionieren oder handelt es sich nur um einen weiteren Hype, der schon bald wieder vergessen sein wird? Der vorliegende Report schafft ein einheitliches Verständnis, beschreibt den aktuellen Stand aus der Managementperspektive und geht auf zukünftige Entwicklungen ein