3,658 research outputs found

    A BeppoSAX observation of the super-soft source CAL87

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    We report on a BeppoSAX Concentrator Spectrometer observation of the super-soft source (SSS) CAL87. The X-ray emission in SSS is believed to arise from nuclear burning of accreted material on the surface of a white dwarf (WD). An absorbed blackbody spectral model gives a chi^2_v of 1.18 and a temperature of 42 +/- ^13 _11 eV. However, the derived luminosity and radius are greater than the Eddington limit and radius of a WD. Including an O viii edge at 0.871 keV gives a significantly better fit (at > 95% confidence) and results in more realistic values of the source luminosity and radius. We also fit WD atmosphere models to the CAL87 spectrum. These also give reasonable bolometric luminosities and radii in the ranges 2.7-4.8 10^{36} erg/s and 8-20 10^7 cm, respectively. These results support the view that the X-ray emission from CAL87 results from nuclear burning in the atmosphere of a WD.Comment: 4 pages. Accepted for publication in A&A (Letters

    Prevalence and pattern of self-medication in elderly individuals

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    Background: Self-medication that is taking medicines without prescription by the doctor is highly prevalence in the community. Elderly population is more likely to self-medicate due to multiple morbidities. This study was undertaken to evaluate the prevalence and pattern of use of self-medication among elderly individuals.Methods: Study was carried out at tertiary care hospital. The questionnaire which was used in our earlier studies regarding self-medication was utilized. After obtaining consent, the elderly individuals (≥60 years) reporting for health check-up were requested to fill up the questionnaire themselves or were asked to respond to questions verbally in the case of illiterate. Questionnaire mainly contained demographic and clinical data and self-medication details - frequency, symptoms/disease for self-medication, drugs, reasons for self-medication, sources of information, awareness regarding the risk of self-medication.Results: Out of 200 elderly included in the study, 177(88.5%) reported self-medication in 6-month recall period. About 60% were male and mean age - 69.64±6.21 (60-85) years. About 21% reported frequent self-medication. Abdominal pain (16%) and headache (14%) were the most common symptoms, and diabetes (7%) was the most common disease for self-medication. Allopathic medicines (55%) mainly paracetamol (13.5%) were most frequently used followed by home remedies (23%) and ayurvedic (17%). Previous experience with the drug (50%) followed by advertisements (23.2%) were common source of information. Most common reasons for self-medication were convenience (69.5%) and cost (56%). None of respondents were aware of risks of self-medicationConclusion: Self-medication is highly prevalent in elderly people who are unaware of risks involved

    BeppoSAX LECS background subtraction techniques

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    We present 3 methods for the subtraction of non-cosmic and unresolved cosmic backgrounds observed by the Low-Energy Concentrator Spectrometer (LECS) on-board BeppoSAX. Removal of these backgrounds allows a more accurate modeling of the spectral data from point and small-scale extended sources. At high (>|25| degree) galactic latitudes, subtraction using a standard background spectrum works well. At low galactic latitudes, or in complex regions of the X-ray sky, two alternative methods are presented. The first uses counts obtained from two semi-annuli near the outside of the LECS field of view to estimate the background at the source location. The second method uses ROSAT Position Sensitive Proportional Counter (PSPC) all-sky survey data to estimate the LECS background spectrum for a given pointing position. A comparison of the results from these methods provides an estimate of the systematic uncertainties. For high galactic latitude fields, all 3 methods give 3 sigma confidence uncertainties of <0.9 10^-3 count/s (0.1-10 keV), or <1.5 10^-3 count/s (0.1-2 keV). These correspond to 0.1-2.0 keV fluxes of 0.7-1.8 and 0.5-1.1 10^-13 erg/cm2/s for a power-law spectrum with a photon index of 2 and photoelectric absorption of 3 10^20 and 3 10^21 atom/cm2, respectively. At low galactic latitudes, or in complex regions of the X-ray sky, the uncertainties are a factor ~2.5 higher.Comment: 13 pages. Accepted for publication in A&A

    Explaining the Better Prognosis of ScreeningExposed Breast Cancers: Influence of Tumor Characteristics and Treatment

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    This study was funded by a grant from the UK Department of Health (no. 106/0001). The grant was awarded to Prof Stephen W Duffy

    A comparison of match demands using ball-in-play versus whole match data in professional soccer players of the English Championship

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    This is the first study to report the Whole Match, ball-in-play (BiP), ball-out-of-play (BoP), and Max BiP (worst case scenario phases of play) demands of professional soccer players competing in the English Championship. Effective playing time per soccer game is typically 90 s) providing precise peak match demands. Whole-match demands recorded were compared to BiP and Max BiP, and BiP data excluded data from all match stoppages, providing a more precise analysis of match demands. Whole-match metrics were significantly lower than BiP metrics (p 90 s. No significant differences were found between positions. Ball-in-play analysis allows an accurate representation of the game and physical demands imposed on professional soccer players. Through having a clearer understanding of maximum game demands in professional soccer, will enable practitioners to design highly specific training methods
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