Search results for "Observations"
showing 8 items of 118 documents
GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
2017
On August 17, 2017 at 12-41:04 UTC the Advanced LIGO and Advanced Virgo gravitational-wave detectors made their first observation of a binary neutron star inspiral. The signal, GW170817, was detected with a combined signal-to-noise ratio of 32.4 and a false-alarm-rate estimate of less than one per 8.0×104 years. We infer the component masses of the binary to be between 0.86 and 2.26 M, in agreement with masses of known neutron stars. Restricting the component spins to the range inferred in binary neutron stars, we find the component masses to be in the range 1.17-1.60 M, with the total mass of the system 2.74-0.01+0.04M. The source was localized within a sky region of 28 deg2 (90% probabili…
Lärarstudenter som aktörer i interaktiv observation och handledning: En studie om digitala redskap i VFU-handledning på övningsskolor
2018
Source at https://doi.org/10.23865/hu.v8.1078. Licensed CC BY-NC-ND 4.0. Syftet med denna artikel är att bidra med kunskap om hur digitala redskap kan påverka lärarstudenters deltagande i handledningsprocessen. Trots att lärarstudenter och handledare ofta befinner sig i digitala klassrumsmiljöer används digitala redskap endast i begränsad omfattning under handledningsprocessen. Med utgångspunkt i Wengers teori om lärande i en praktikgemenskap har lärarstudenter och handledare arbetat med stöd av digitala observationsunderlag. Processen har studerats på fyra övningsskolor. Information om studenternas erfarenheter av handledningen har samlats in via enkäter och fokusgruppsamtal. Resultatet vi…
A Decade of GRB Follow-Up by BOOTES in Spain (2003–2013)
2016
This article covers ten years of GRB follow-ups by the Spanish BOOTES stations: 71 follow-ups providing 23 detections. Follow-ups by BOOTES-1B from 2005 to 2008 were given in a previous article and are here reviewed and updated, and additional detection data points are included as the former article merely stated their existence. The all-sky cameras CASSANDRA have not yet detected any GRB optical afterglows, but limits are reported where available.
The ALHAMBRA survey: evolution of galaxy clustering since z∼1
2014
We study the clustering of galaxies as function of luminosity and redshift in the range $0.35 < z < 1.25$ using data from the Advanced Large Homogeneous Area Medium Band Redshift Astronomical (ALHAMBRA) survey. The ALHAMBRA data used in this work cover $2.38 \mathrm{deg}^2$ in 7 independent fields, after applying a detailed angular selection mask, with accurate photometric redshifts, $��_z \lesssim 0.014 (1+z)$, down to $I_{\rm AB} < 24$. Given the depth of the survey, we select samples in $B$-band luminosity down to $L^{\rm th} \simeq 0.16 L^{*}$ at $z = 0.9$. We measure the real-space clustering using the projected correlation function, accounting for photometric redshifts uncert…
THE ALHAMBRA SURVEY: EVOLUTION OF GALAXY SPECTRAL SEGREGATION
2016
arXiv:1601.03668v1
Teacher-student interaction and lower secondary school students’ situational engagement
2019
Background: Prior research has shown that engagement plays a significant role in students’ academic learning. Aims: The present study sought to expand the current understanding of students’ engagement by examining how situational engagement during a particular lesson is associated with the observed teacher–student classroom interactions (i.e., emotional support, instructional support, and classroom organization) in the same lesson. Sample: The participants were 709 Grade 7 students (47.7% girls) from 59 classrooms in 26 lower secondary schools and 51 teachers. Methods: The data consisted of 155 video‐recorded lessons (90 language arts and 65 mathematics lessons) coded using the Classroom As…
Foneettisten piirteiden ja vieraan aksentin yhteydestä suomen kielessä
2018
Tapaustutkimuksemme tarkoituksena on selvittaa muutaman foneettisen piirteen ja vieraan aksentin yhteytta suomen kielessa. Analysoimme ilmiota kuulijatestilla, akustisin mittauksin ja kirjoittajien tekemin kuulonvaraisin havainnoin. Puhujina ovat varsin edistyneet suomenpuhujat, jotka puhuvat suomea toisena tai vieraana kielenaan. Tuloksemme antavat uutta tietoa vieraan aksentin ja foneettisten piirteiden yhteyksista seka tarjoavat avauksia jatkotutkimukselle. Tutkitut piirteet ovat pitkien vokaalien etaisyydet, aannekestot, perustaajuuden (f0) vaihteluvali, f0:n vaihtelun jyrkkyys ja keskihajonta seka artikulaationopeus. Tuloksemme osoittavat, etta kaikilla piirteilla on yhteys vieraaseen …
Lagrangian matches between observations from aircraft, lidar and radar in an orographic warm conveyor belt
2020
Warm conveyor belts (WCBs) are important airstreams in extratropical cyclones, often leading to the formation of intense precipitation and the amplification of upper-level ridges. This study presents a case study that involves aircraft, lidar and radar observations in a WCB ascending from western Europe towards the Baltic Sea during the Hydrological Cycle in the Mediterranean Experiment (HyMeX) and T-NAWDEX-Falcon in October 2012, a preparatory campaign for the THORPEX North Atlantic Waveguide and Downstream Impact Experiment (T-NAWDEX). Trajectories were used to link different observations along the WCB, that is, to establish so-called Lagrangian matches between observations. To this aim, …