Brorfelde Schmidt CCD Catalog (BSCC)

The Brorfelde Schmidt CCD Catalog (BSCC) contains about 13.7 million stars, north of +49 deg Declination with precise positions and V, R photometry. The catalog has been constructed from the reductions of 18,667 CCD frames observed with the Brorfelde Schmidt Telescope between 2000 and 2007. The Tycho-2 catalog was used for astrometric and photometric reference stars. Errors of individual positions are about 20 to 200 mas for stars in the R = 10 to 18 mag range. External comparisons with 2MASS and SDSS reveal possible small systematic errors in the BSCC of up to about 30 mas. The catalog is supplemented with J, H, and K_s magnitudes from the 2MASS catalog. The catalog data file (about 550 MB ASCII, compressed) will be made available at the Strasbourg Data Center (CDS).Comment: 16 pages, 22 figures, 2 tables, accepted by A

Probe for the strong parity violation effects at RHIC with three particle correlations

In non-central relativistic heavy ion collisions, \P-odd domains, which might be created in the process of the collision, are predicted to lead to charge separation along the system orbital momentum \cite{Kharzeev:2004ey}. An observable, \P-even, but directly sensitive to the charge separation effect, has been proposed in \cite{Voloshin:2004vk} and is based on 3-particle mixed harmonics azimuthal correlations. We report the STAR measurements using this observable for Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}$=200 and 62 GeV. The results are reported as function of collision centrality, particle separation in rapidity, and particle transverse momentum. Effects that are not related to parity violation but might contribute to the signal are discussed.Comment: 4 pages, Quark Matter 2008 Poster proceeding

An in-depth reanalysis of the alleged type Ia supernova progenitor Henize 2-428

Context. The nucleus of the planetary nebula Hen 2-428 is a short orbital-period (4.2 h), double-lined spectroscopic binary, whosestatus as potential supernova type Ia progenitor has raised some controversy in the literature.Aims. Aiming to resolve this debate, we carried out an in-depth reanalysis of the system.Methods. Our approach combines a refined wavelength calibration, thorough line-identifications, improved radial-velocity measure-ments, non-LTE spectral modeling, as well as multi-band light-curve fitting. Our results are then discussed in view of state-of-the-artstellar evolutionary models.Results. Besides systematic zero-point shifts in the wavelength calibration of the OSIRIS spectra also used in the previous analysis ofthe system, we found that the spectra are contaminated with diffuse interstellar bands. Our Voigt-profile radial velocity fitting method,which considers the additional absorption of these diffuse interstellar bands, reveals significantly lower masses (M1 = 0.66 ± 0.11 Mand M2 = 0.42 ± 0.07 M ) than previously reported and a mass ratio clearly below unity. Our spectral and light curve analyses leadto consistent results, though, we find higher effective temperatures and smaller radii than previously reported. Moreover, we find thered-excess that was reported before, is merely an artifact of an outdated reddening law used in the previous work.Conclusions. Our work showed that blends of He ii λ 5412 Å with DIBs have led to an overestimation of the previously reporteddynamical masses of Hen 2-428. The merging event of Hen 2-428 will not be recognized as a supernova type Ia, but most likely leadto the formation of a H-deficient star. We suggest that the system was formed via a first stable mass transfer episode, followed bycommon envelope evolution, and is now composed of a post-early asymptotic giant branch star and a reheated He-core white dwarf.Fil: Reindl, N.. Universitat Potsdam; AlemaniaFil: Schaffenroth, V.. Universitat Potsdam; AlemaniaFil: Miller Bertolami, Marcelo Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Geier, S.. Universitat Potsdam; AlemaniaFil: Finch, N. L.. University of Leicester; Reino UnidoFil: Barstow, M. A.. University of Leicester; Reino UnidoFil: Casewell, S. L.. University of Leicester; Reino UnidoFil: Taubenberger, S.. Gobierno de la República Federal de Alemania. Max Planck Institut für Astrophysik; Alemani

Statistical Properties of the Final State in One-dimensional Ballistic Aggregation

We investigate the long time behaviour of the one-dimensional ballistic aggregation model that represents a sticky gas of N particles with random initial positions and velocities, moving deterministically, and forming aggregates when they collide. We obtain a closed formula for the stationary measure of the system which allows us to analyze some remarkable features of the final `fan' state. In particular, we identify universal properties which are independent of the initial position and velocity distributions of the particles. We study cluster distributions and derive exact results for extreme value statistics (because of correlations these distributions do not belong to the Gumbel-Frechet-Weibull universality classes). We also derive the energy distribution in the final state. This model generates dynamically many different scales and can be viewed as one of the simplest exactly solvable model of N-body dissipative dynamics.Comment: 19 pages, 5 figures include

Charged anisotropic matter with linear equation of state

We consider the general situation of a compact relativistic body with anisotropic pressures in the presence of the electromagnetic field. The equation of state for the matter distribution is linear and may be applied to strange stars with quark matter. Three classes of new exact solutions are found to the Einstein-Maxwell system. This is achieved by specifying a particular form for one of the gravitational potentials and the electric field intensity. We can regain anisotropic and isotropic models from our general class of solution. A physical analysis indicates that the charged solutions describe realistic compact spheres with anisotropic matter distribution. The equation of state is consistent with dark energy stars and charged quark matter distributions. The masses and central densities correspond to realistic stellar objects in the general case when anisotropy and charge are present.Comment: 17 pages, To appear in Class. Quantum Gra

Impetus to change: a multi-site qualitative exploration of the national audit of dementia

This is the final version. Available on open access from BMC via the DOI in this recordBackground: National audit is a key strategy used to improve care for patients with dementia. Audit and feedback has been shown to be effective, but with variation in how much it improves care. Both evidence and theory identify active ingredients associated with effectiveness of audit and feedback. It is unclear to what extent national audit is consistent with evidence- and theory-based audit and feedback best practice. Methods: We explored how the national audit of dementia is undertaken in order to identify opportunities to enhance its impact upon the improvement of care for people with dementia. We undertook a multi-method qualitative exploration of the national audit of dementia at six hospitals within four diverse English National Health Service organisations. Inductive framework analysis of 32 semi-structured interviews, documentary analysis (n=39) and 44 hours of observations (n=36) was undertaken. Findings were presented iteratively to a stakeholder group until a stable description of the audit and feedback process was produced. Results: Each organisation invested considerable resources in the audit. The audit results were dependent upon the interpretation by case note reviewers who extracted the data. The national report was read by a small number of people in each organisation, who translated it into an internal report and action plan. The internal report was presented at specialty and organisation-level committees. The internal report did not include information that was important to how committee members collectively decided whether and how to improve performance. Participants reported that the national audit findings may not reach clinicians who were not part of the specialty or organisation-level committees. Conclusions: There is considerable organisational commitment to the national audit of dementia. We describe potential evidence- and theory-informed enhancements to the enactment of the audit to improve the local response to performance feedback in the national audit. The enhancements relate to the content and delivery of the feedback from the national audit provider, support for the clinicians leading the organisational response to the feedback, and the feedback provided within the organisation.National Institute for Health Research (NIHR

Simultaneous measurement of the muon neutrino charged-current cross section on oxygen and carbon without pions in the final state at T2K

This paper reports the first simultaneous measurement of the double differential muon neutrino charged-current cross section on oxygen and carbon without pions in the final state as a function of the outgoing muon kinematics, made at the ND280 off-axis near detector of the T2K experiment. The ratio of the oxygen and carbon cross sections is also provided to help validate various models' ability to extrapolate between carbon and oxygen nuclear targets, as is required in T2K oscillation analyses. The data are taken using a neutrino beam with an energy spectrum peaked at 0.6~GeV and comprises 57.34$\times$10$^{19}$ protons on target. The extracted measurement is compared with the prediction from different Monte Carlo neutrino-nucleus interaction event generators, showing particular model separation for very forward-going muons. Overall, of the models tested, the result is best described using Local Fermi Gas descriptions of the nuclear ground state with RPA suppression

Use of contingency management incentives to improve completion of hepatitis B vaccination in people undergoing treatment for heroin dependence: a cluster randomised trial

Background: Poor adherence to treatment diminishes its individual and public health benefit. Financial incentives, provided on the condition of treatment attendance, could address this problem. Injecting drug users are a high-risk group for hepatitis B virus (HBV) infection and transmission, but adherence to vaccination programmes is poor. We aimed to assess whether contingency management delivered in routine clinical practice increased the completion of HBV vaccination in individuals receiving opioid substitution therapy. Methods: In our cluster randomised controlled trial, we enrolled participants at 12 National Health Service drug treatment services in the UK that provided opioid substitution therapy and nurse-led HBV vaccination with a super-accelerated schedule (vaccination days 0, 7, and 21). Clusters were randomly allocated 1:1:1 to provide vaccination without incentive (treatment as usual), with fixed value contingency management (three £10 vouchers), or escalating value contingency management (£5, £10, and £15 vouchers). Both contingency management schedules rewarded on-time attendance at appointments. The primary outcome was completion of clinically appropriate HBV vaccination within 28 days. We also did sensitivity analyses that examined vaccination completion with full adherence to appointment times and within a 3 month window. The trial is registered with Current Controlled Trials, number ISRCTN72794493. Findings: Between March 16, 2011, and April 26, 2012, we enrolled 210 eligible participants. Compared with six (9%) of 67 participants treated as usual, 35 (45%) of 78 participants in the fixed value contingency management group met the primary outcome measure (odds ratio 12·1, 95% CI 3·7–39·9; p<0·0001), as did 32 (49%) of 65 participants in the escalating value contingency management group (14·0, 4·2–46·2; p<0·0001). These differences remained significant with sensitivity analyses. Interpretation: Modest financial incentives delivered in routine clinical practice significantly improve adherence to, and completion of, HBV vaccination programmes in patients receiving opioid substitution therapy. Achievement of this improvement in routine clinical practice should now prompt actual implementation. Drug treatment providers should employ contingency management to promote adherence to vaccination programmes. The effectiveness of routine use of contingency management to achieve long-term behaviour change remains unknown