177 research outputs found

    Locked and loading megathrust linked to active subduction beneath the Indo-Burman Ranges

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    The Indo-Burman mountain rangesmarkthe boundary between the Indian and Eurasian plates, north of the Sumatra–Andaman subduction zone. Whether subduction still occurs along this subaerial section of the plate boundary, with 46mm/yr of highly oblique motion, is contentious. About 21mm/yr of shear motion is taken up along the Sagaing Fault, on the eastern margin of the deformation zone. It has been suggested that the remainder of the relative motion is taken up largely or entirely by horizontal strike-slip faulting and that subduction has stopped. Here we present GPS measurements of plate motions in Bangladesh, combined with measurements from Myanmar and northeast India, taking advantage of a more than 300 km subaerial accretionary prism spanning the Indo-Burman Ranges to the Ganges–Brahmaputra Delta. They reveal 13–17mm/yr of plate convergence on an active, shallowly dipping and locked megathrust fault. Most of the strike-slip motion occurs on a few steep faults, consistent with patterns of strain partitioning in subduction zones. Our results strongly suggest that subduction in this region is active, despite the highly oblique plate motion and thick sediments. We suggest that the presence of a locked megathrust plate boundary represents an underappreciated hazard in one of the most densely populated regions of the world

    Open data from the third observing run of LIGO, Virgo, KAGRA and GEO

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    The global network of gravitational-wave observatories now includes five detectors, namely LIGO Hanford, LIGO Livingston, Virgo, KAGRA, and GEO 600. These detectors collected data during their third observing run, O3, composed of three phases: O3a starting in April of 2019 and lasting six months, O3b starting in November of 2019 and lasting five months, and O3GK starting in April of 2020 and lasting 2 weeks. In this paper we describe these data and various other science products that can be freely accessed through the Gravitational Wave Open Science Center at https://gwosc.org. The main dataset, consisting of the gravitational-wave strain time series that contains the astrophysical signals, is released together with supporting data useful for their analysis and documentation, tutorials, as well as analysis software packages.Comment: 27 pages, 3 figure

    Observation of gravitational waves from the coalescence of a 2.5−4.5 M⊙ compact object and a neutron star

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

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    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

    Ultralight vector dark matter search using data from the KAGRA O3GK run

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    Among the various candidates for dark matter (DM), ultralight vector DM can be probed by laser interferometric gravitational wave detectors through the measurement of oscillating length changes in the arm cavities. In this context, KAGRA has a unique feature due to differing compositions of its mirrors, enhancing the signal of vector DM in the length change in the auxiliary channels. Here we present the result of a search for U(1)B−L gauge boson DM using the KAGRA data from auxiliary length channels during the first joint observation run together with GEO600. By applying our search pipeline, which takes into account the stochastic nature of ultralight DM, upper bounds on the coupling strength between the U(1)B−L gauge boson and ordinary matter are obtained for a range of DM masses. While our constraints are less stringent than those derived from previous experiments, this study demonstrates the applicability of our method to the lower-mass vector DM search, which is made difficult in this measurement by the short observation time compared to the auto-correlation time scale of DM

    Security and privacy approaches in mixed reality: A literature survey

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    Mixed reality (MR) technology development is now gaining momentum due to advances in computer vision, sensor fusion, and realistic display technologies. With most of the research and development focused on delivering the promise of MR, the privacy and security implications of this technology are yet to be thoroughly investigated. This survey article aims to put in to light these risks and to look into the latest security and privacy work on MR. Specifically, we list and review the different protection approaches that have been proposed to ensure user and data security and privacy in MR. We extend the scope to include work on related technologies such as augmented reality, virtual reality, and human-computer interaction as crucial components, if not the origins, of MR, as well as numerous related work from the larger area of mobile devices, wearables, and Internet-of-Things. We highlight the lack of investigation, implementation, and evaluation of data protection approaches in MR. Further challenges and directions on MR security and privacy are also discussed

    Factores de Riesgo Cardiovascular en Pacientes con Psoriasis.

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    La psoriasis es una enfermedad inflamatoria crónica de causa desconocida y multifactorial, que afecta 1 - 3% de la población, 75% de los casos comienzan antes de los 40 años; se caracteriza por su granheterogeneidad clínica, con periodos de remisión y exacerbación. La psoriasis se ha relacionado con elevación de la morbimortalidad por eventos cardiovasculares. Existe un continuo interés por esta relaciónpor lo que las investigaciones van dirigidas actualmente a establecer el vínculo entre esta enfermedad y el aumento del riesgo de enfermedades cardiovasculares. En base a esto se realizó un estudio descriptivo, decorte transversal dentro del paradigma cuantitativo, para determinar los factores de riesgo cardiovascular en pacientes con psoriasis; se evaluaron 30 pacientes con psoriasis; 14 de sexo femenino y 16 masculino; edad predominante: 40-59 años (46.7%), en relación a los factores de riesgo cardiovascular el sobrepeso se presentó en 14 (46.7%) pacientes (IMC: 25-29.9) y 9 (30%) resultaron obesos(IMC>30), circunferencia abdominal elevada: mujeres (36.7%) y 5 (16.7%) hombres. En 18 (60%) pacientes se encontró HDLcolesterol<40mg/dl hombres; <50 mg/dl mujeres), LDL -colesterol (>100mg/dl) en 20 (66.7%) pacientes, otros factores como antecedentes familiares de enfermedad coronaria, hipertensión arterial, tabaquismo,sedentarismo y estrés se presentaron en un alto porcentaje en los pacientes estudiados. Se concluye; la coexistencia entre el síndrome metabólico y la psoriasis, por lo que es de importancia capital el abordaje multidisciplinario de esta dermatosis y la necesidad de modificar el estilo de vida de los pacientes que la padecen

    «Quand je serai grande, je serai éco-infirmière»

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    Face aux désastres de la crise climatique, un nouveau rôle infirmier se dessine - une vision ambitieuse, à la hauteur des compétences professionnelles, qui vise des solutions durables
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