48,791 research outputs found
Teacher and child talk in active learning and whole-class contexts : some implications for children from economically less advantaged home backgrounds
This paper reports the experiences of 150 children and six primary teachers when active learning pedagogies were introduced into the first year of primary schools. Although active learning increased the amount of talk between children, those from socio-economically advantaged homes talked more than those from less advantaged homes. Also, individual children experienced very little time engaged in high-quality talk with the teacher, despite the teachers spending over one-third of their time responding to children's needs and interests. Contextual differences, such as the different staffing ratios in schools and pre-schools,may affect how well the benefits of active learning transfer from preschool contexts into primary schools. Policy-makers and teachers should pay particular attention to the implications of this for the education of children from economically less advantaged home backgrounds
Packet loss characteristics of IPTV-like traffic on residential links
Packet loss is one of the principal threats to quality of experience for IPTV systems. However, the packet loss characteristics of the residential access networks which carry IPTV are not widely understood. We present packet level measurements of streaming IPTV-like traffic over four residential access links, and describe the extent and nature of packet loss we encountered. We discuss the likely impact of these losses for IPTV traffic, and outline steps which can ameliorate this
Recommended from our members
Adolescents’ view and experiences of living with type 1 diabetes
This literature review aims to explore the perceptions and experiences of adolescents living with Type 1 Diabetes, and its impact on their lives. The prevalence and the number of adolescents living with this condition are rapidly increasing in western societies. Therefore, it is imperative that these adolescents’ views and experiences are well researched and understood, so they can receive the optimum support they need. A systematic database search identified studies conducted between 2004 and 2014, from 5 different countries. Most participants in the studies were adolescents between the ages of 13-17, although some studies included participants from 11 to 18 years. Key findings identified were striving for autonomy, parental conflicts, yearning for social acceptance and concerns regarding diabetes education. Psychosocial, management and knowledge of type 1 diabetes were the major themes identified following the thematic analysis. The psychosocial impact of living with type 1 diabetes was significant amongst adolescents. Therefore, they would benefit from more in-depth research on this subject, identifying contemporary and innovative ways to help them cope better with their condition
Correlations of near-infrared, optical and X-ray luminosity for early-type galaxies
The relation between X-ray luminosity and near-infrared luminosity for
early-type galaxies has been examined. Near-infrared (NIR) luminosities should
provide a superior measure of stellar mass compared to optical luminosities
used in previous studies, especially if there is significant star-formation or
dust present in the galaxies. However, we show that the X-ray-NIR relations are
remarkably consistent with the X-ray-optical relations. This indicates that the
large scatter of the relations is dominated by scatter in the X-ray properties
of early-type galaxies, and is consistent with early-types consisting of old,
quiescent stellar populations.
We have investigated scatter in terms of environment, surface brightness
profile, Mg2, H_beta, H_gamma line strength indices, spectroscopic age, and
nuclear H_alpha emission. We found that galaxies with high Mg2 index, low
H_beta and H_gamma indices or a `core' profile have a large scatter in Lx,
whereas galaxies with low Mg2, high H_beta and H_gamma indices or `power-law'
profiles, generally have Lx<10^41 erg/s. There is no clear trend in the scatter
with environment or nuclear H_alpha emission.Comment: Accepted for publication in MNRAS. 22 pages, 15 figure
Prospects for Discovering Supersymmetry at the LHC
Supersymmetry is one of the best-motivated candidates for physics beyond the
Standard Model that might be discovered at the LHC. There are many reasons to
expect that it may appear at the TeV scale, in particular because it provides a
natural cold dark matter candidate. The apparent discrepancy between the
experimental measurement of g_mu - 2 and the Standard model value calculated
using low-energy e+ e- data favours relatively light sparticles accessible to
the LHC. A global likelihood analysis including this, other electroweak
precision observables and B-decay observables suggests that the LHC might be
able to discover supersymmetry with 1/fb or less of integrated luminosity. The
LHC should be able to discover supersymmetry via the classic missing-energy
signature, or in alternative phenomenological scenarios. The prospects for
discovering supersymmetry at the LHC look very good.Comment: 8 pages, 11 figure
The K Band Luminosity Functions of Galaxies in High Redshift Clusters
K band luminosity functions (LFs) of three, massive, high redshift clusters
of galaxies are presented. The evolution of K*, the characteristic magnitude of
the LF, is consistent with purely passive evolution, and a redshift of forma
tion z = 1.5-2.Comment: 3 pages, to appear in Proceedings of IAU Colloquium 195 - Outskirts
of Galaxy Clusters: intense life in the suburb
- …