Radio and X-ray variability of Young Stellar Objects in the Coronet Cluster

The Coronet Cluster in the nearby R CrA dark cloud offers the rare opportunity to study at least four "class I" protostellar sources as well as one candidate "class 0" source, a Herbig Ae star, and a candidate brown dwarf within a few square arcminutes - most of them detected at radio- and X-ray wavelengths. These sources were observed with the Very Large Array (VLA) at 3.5cm on nine occasions in 1998, spread over nearly four months. The source IRS 5, earlier shown to emit circularly polarized radio emission, was observed to undergo a flux increase accompanied by changes in its polarization properties. Comparison with VLA measurements taken in January 1997 allows for some analysis of longer-term variability. In addition to this radio monitoring, we analyze archival Chandra and XMM-Newton X-ray data of these sources. Three class I protostars are bright enough for X-ray spectroscopy, and we perform a variability analysis for these sources, covering a total of 154 ksec spread over more than two and a half years. Also in X-rays, IRS 5 shows the most pronounced variability, whilst the other two class I protostars IRS 1 and IRS 2 have more stable emission. X-ray data is also analyzed for the recently identified candidate class 0 source IRS 7E, which shows strong variability as well as for the Herbig Ae star R CrA for which we find extremely hot X-ray-emitting plasma. For IRS 1,2 and 5, the hydrogen column densities derived from the X-ray spectra are at about half the values derived with near-infrared techniques, a situation similar to what has been observed towards some other young stellar objects.Comment: 17 pages, 11 figures, accepted for publication in A&

The prestellar and protostellar population of R Coronae Australis

We present 450 and 850 um maps of R Coronae Australis. We compare the maps to previous surveys of the region, and shed new light on the previously unknown nature of the protostellar sources at the centre of the cloud. We clarify the nature of two millimetre sources previously discovered in lower resolution data. We identify one new Class 0 protostar that we label SMM 1B, and we measure the envelope masses of a number of more evolved protostars. We identify two new prestellar cores that we call SMM 1A and SMM 6.Comment: 8 page

CENELEC SmartHouse Roadmap Draft Recommendations

Discussion piece SHR Plenary Meeting 10 September 2010 Brussels

A Numerical and Analytical Study of Vortex Rings With Swirl

We study the growth of disturbances to vortex rings with swirl, which are exact solutions of the Euler equations of inviscid flow, using two contrasting methods. The motion of the perturbed vortex rings can be regarded as a prototype for the inviscid dynamics of vortex structures in 3D. Exact rings with swirl are computed as steady, axisymmetric flows using a variational method. Asymptotic analysis in the short wave limit, similar to geometric optics, leads to ordinary differential equations for perturbations along particle paths. These ODE's can be solved for the rings of interest, yielding predicted maximum growth rates for small disturbances. These rates are compared with the direct simulation of sample disturbances using a 3D vortex method to calculate the evolution according to the Euler equations. 1 Introduction In recent years there has been considerable interest in understanding the dynamics of flows with localized vortex structures such as filaments and rings. Despite conside..

A numerical and analytical study of vortex rings with swirl

We study the growth of disturbances to vortex rings with swirl, which are exact solutions of the Euler equations of inviscid flow, using two contrasting methods. The motion of the perturbed vortex rings can be regarded as a prototype for the inviscid dynamics of vortex structures in 3D. Exact rings with swirl are computed as steady, axisymmetric flows using a variational method. Asymptotic analysis in the short wave limit, similar to geometric optics, leads to ordinary differential equations for perturbations along particle paths. These ODE's can be solved for the rings of interest, yielding predicted maximum growth rates for small disturbances. These rates are compared with the direct simulation of sample disturbances using a 3D vortex method to calculate the evolution according to the Euler equations

CENELEC Project Report Smart House Roadmap (draft)

This CENELEC project report has been drafted by a project team and steering group of representatives of interested parties and is to be endorsed on 2010-11-23. Neither the national members of CENELEC nor the CEN-CENELEC Management Centre can be held accountable for the technical content of this CENELEC project report or possible conflicts with standards or legislation. This CENELEC project report can in no way be held as being an official standard developed by CENELEC and its members. This CENELEC project report is publicly available as a reference document from the CENELEC members

A study of an intensive home-based treatment program and its impact on admissions in an aged-care setting

Objective: This study aims to evaluate an Intensive Home Based Program (IHBP) in terms of effects on admissions and length of stay. Method: The Brief Psychiatric Rating Scale (BPRS) and Mongomery Asberg Depression Rating Scale (MADRS) were completed on two patient cohorts, IHBP (n=65) and in-patients (IPs) (n=29). Hospital admissions and length of stay were also measured. Diagnostic and treatment data for patients were collected. Results: The clinical outcomes of a sample of patients who were treated on the IHBP were compared to those treated as IPs, and the impact on hospital admissions was considered. Clinical improvement was greater in the more severely ill IPs, but those treated on the IHBP also showed significant improvement. Initially, rates of hospital admissions decreased but have since increased as have admissions to the IHBP. Conclusion: The program is in its third year, is well received and utilised, is considered useful in providing early intervention and may have a role in preventing hospital admissions. Key Words: Intensive home based program, Health services, Admission, Outpatient, Inpatient, Aged care South African Psychiatry Review Vol.7(4) 2004: 21-2

A Fast Algorithm for Large Common Connected Induced Subgraphs

International audienceWe present a fast algorithm for finding large common sub-graphs, which can be exploited for detecting structural and functional relationships between biological macromolecules. Many fast algorithms exist for finding a single maximum common subgraph. We show with an example that this gives limited information, motivating the less studied problem of finding many large common subgraphs covering different areas. As the latter is also hard, we give heuristics that improve performance by several orders of magnitude. As a case study, we validate our findings experimentally on protein graphs with thousands of atoms

The effect of mind-mapping applications on upper primary students’ success and inquiry-learning skills in science and environment education

This study aims at identifying the effects of the mind-mapping technique upon students perceptions of inquiry-learning skills, academic achievement, and retention of knowledge. The study was carried out in the Science and Technology course. A quasi-experimental research design with a pre-test and post-test control group, which was selected from seventh graders, was used in this study. Sixty-four seventh graders participated in this study during the 2010-2011 academic year in Izmir, Turkey. The result of the study shows that there is a significant difference in favour of the experimental group over the control group regarding the academic achievement, scores of retention of learning, and perception of inquiry-learning skill scores, both on cognitive and affective levels. © 2013 Taylor & Francis