Search results for "RSTS"
showing 10 items of 97 documents
Dzemdes kakla vēža skrīninga programmas efektivitāte Latvijā un ģimenes ārsta loma skrīninga programmas īstenošanā
2017
Problēmas būtība. Dzemdes kakla vēzis ir ceturtais biežākais vēzis sievietēm Pasaulē, piektais biežākais Latvijā. Turklāt, tas ir ceturtais biežākais nāves iemesls no kopējā vēžu skaita Pasaulē un Latvija starp Eiropas valstīm dzemdes kakla vēža nāves statistikā aizņem sesto vietu. Šie augstie rādītāji parāda, ka dzemdes kakla vēža skrīninga programma Latvijā nav augsti efektīva un prasa vairāk pētījumu. Pētījuma mērķis. Pamatojoties uz Latvijas pacienšu un ģimenes ārstu populācijas anketēšanas rezultātiem un salīdzinot ar citu valstu pētījumiem, izvērtēt dzemdes kakla vēža skrīninga efektivitāti Latvijā un ģimenes ārstu lomu un iesaistīšanos skrīninga programmas īstenošanā. Materiāli un me…
Search for Gravitational-wave Signals Associated with Gamma-Ray Bursts during the Second Observing Run of Advanced LIGO and Advanced Virgo
2019
We present the results of targeted searches for gravitational-wave transients associated with gamma-ray bursts during the second observing run of Advanced LIGO and Advanced Virgo, which took place from 2016 November to 2017 August. We have analyzed 98 gamma-ray bursts using an unmodeled search method that searches for generic transient gravitational waves and 42 with a modeled search method that targets compact-binary mergers as progenitors of short gamma-ray bursts. Both methods clearly detect the previously reported binary merger signal GW170817, with p-values of <9.38 10-6 (modeled) and 3.1 10-4 (unmodeled). We do not find any significant evidence for gravitational-wave signals associate…
Burst analysis tool for developing neuronal networks exhibiting highly varying action potential dynamics
2012
In this paper we propose a firing statistics based neuronal network burst detection algorithm for neuronal networks exhibiting highly variable action potential dynamics. Electrical activity of neuronal networks is generally analyzed by the occurrences of spikes and bursts both in time and space. Commonly accepted analysis tools employ burst detection algorithms based on predefined criteria. However, maturing neuronal networks, such as those originating from human embryonic stem cells (hESC), exhibit highly variable network structure and time-varying dynamics. To explore the developing burst/spike activities of such networks, we propose a burst detection algorithm which utilizes the firing s…
Quantification and automatized adaptive detection of in vivo and in vitro neuronal bursts based on signal complexity.
2015
In this paper, we propose employing entropy values to quantify action potential bursts in electrophysiological measurements from the brain and neuronal cultures. Conventionally in the electrophysiological signal analysis, bursts are quantified by means of conventional measures such as their durations, and number of spikes in bursts. Here our main aim is to device metrics for burst quantification to provide for enhanced burst characterization. Entropy is a widely employed measure to quantify regularity/complexity of time series. Specifically, we investigate the applicability and differences of spectral entropy and sample entropy in the quantification of bursts in in vivo rat hippocampal meas…
The transient gravitational-wave sky
2013
Interferometric detectors will very soon give us an unprecedented view of the gravitational-wave sky, and in particular of the explosive and transient Universe. Now is the time to challenge our theoretical understanding of short-duration gravitational-wave signatures from cataclysmic events, their connection to more traditional electromagnetic and particle astrophysics, and the data analysis techniques that will make the observations a reality. This paper summarizes the state of the art, future science opportunities, and current challenges in understanding gravitational-wave transients.
Timing techniques applied to distributed modular high-energy astronomy: the H.E.R.M.E.S. project
2021
The HERMES-TP/SP (High Energy Rapid Modular Ensemble of Satellites -- Technologic and Scientific Pathfinder) is an in-orbit demonstration of the so-called distributed astronomy concept. Conceived as a mini-constellation of six 3U nano-satellites hosting a new miniaturized detector, HERMES-TP/SP aims at the detection and accurate localisation of bright high-energy transients such as Gamma-Ray Bursts. The large energy band, the excellent temporal resolution and the wide field of view that characterize the detectors of the constellation represent the key features for the next generation high-energy all-sky monitor with good localisation capabilities that will play a pivotal role in the future …
Quantum gravity with THESEUS
2021
AbstractIn this paper we explore the possibility to search for a dispersion law for light propagation in vacuo with a sample of Gamma-Ray Bursts detected by the THESEUS satellite. Within Quantum Gravity theories, different models for space-time quantization predict relative discrepancies of the speed of photons w.r.t. the speed of light that (in a series expansion) depend on a given power of the ratio of the photon energy to the Planck energy. This ratio is as small as 10− 23 for photons in the soft γ −ray band (100 keV). The dominant effect is determined by the first significant term of this expansion. If the first order in this expansion is relevant, these theories imply a Lorentz Invaria…
The HERMES-Technologic and Scientific Pathfinder
2020
HERMES-TP/SP (High Energy Rapid Modular Ensemble of Satellites Technologic and Scientific Pathfinder) is a constellation of six 3U nano-satellites hosting simple but innovative X-ray detectors, characterized by a large energy band and excellent temporal resolution, and thus optimized for the monitoring of Cosmic High Energy transients such as Gamma Ray Bursts and the electromagnetic counterparts of Gravitational Wave Events, and for the determination of their positions. The projects are funded by the Italian Ministry of University and Research and by the Italian Space Agency, and by the European Union Horizon 2020 Research and Innovation Program under Grant Agreement No. 821896. HERMES-TP/S…
Mākslinieciskās izteiksmes līdzekļu un kompozīcijas principu izpēte Demjena Hērsta gleznās vizuālās mākslas stundās 2. Klasē
2022
Diplomdarba „Mākslinieciskās izteiksmes līdzekļu un kompozīcijas principu izpēte Demjena Hērsta gleznās vizuālās mākslas stundās 2. klasē” mērķis ir izpētīt D.Hērsta gleznās izmantotos mākslinieciskās izteiksmes līdzekļus un kompozīcijas principus, to pielietošanas iespējas vizuālās mākslas stundās 2. klasē. Darba uzdevumi: izpētīt D.Hērsta gleznās izmantotos mākslinieciskās izteiksmes līdzekļus un kompozīcijas paņēmienus; noskaidrot sākumskolas vecuma bērniem raksturīgās attīstības pazīmes un īpatnības; izveidot un ar piemērotu pedagoģisko metožu palīdzību realizēt vizuālās mākslas programmas saturam atbilstošu uzdevumu kopu; apkopot un analizēt iegūtos rezultātus. Diplomdarba nobeigumā ie…
GW170817: Implications for the Stochastic Gravitational-Wave Background from Compact Binary Coalescences
2018
The LIGO Scientific and Virgo Collaborations have announced the first detection of gravitational waves from the coalescence of two neutron stars. The merger rate of binary neutron stars estimated from this event suggests that distant, unresolvable binary neutron stars create a significant astrophysical stochastic gravitational-wave background. The binary neutron star background will add to the background from binary black holes, increasing the amplitude of the total astrophysical background relative to previous expectations. In the Advanced LIGO-Virgo frequency band most sensitive to stochastic backgrounds (near 25 Hz), we predict a total astrophysical background with amplitude $\Omega_{\rm…