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Wyświetlanie 1-10 z 13
Tytuł:
Rediscussion of the early type eclipsing binary SV Cen
Autorzy:
Zejda, M.
Siwak, Michał
de Villiers, S. N.
Zoła, Stanisław
Opis:
We verify the configuration of SV Cen using new, extended to the near infrared VRI light curves. New spectra taken with the SALT telescope confirm emission features around the $H_\alpha$ line in this system and reveal that the intensity of the emission component varies.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Period changes of the sample of eclipsing binaries with active chromospheres
Autorzy:
Kozieł-Wierzbowska, Dorota
Zejda, M.
Zakrzewski, B.
Kuźmicz, Agnieszka
Jabłeka, Damian
Zoła, Stanisław
de Villiers, S. N.
Szymański, Tomasz
Opis:
In this work we present results derived from analysis of the O-C behaviour of ten eclipsing binary systems: AR Lac, CG Cyg, HP Aur, MM Her, RS CVn, RT And, SV Cam, V471 Tau, WW Dra and CF Tuc. It was proved on the basis of moments of minima compiled from the literature and new ones determined from recent observations, that these binaries show long term (19-91 years) modulations of their orbital periods, clearly visible in their O-C diagrams. Two possible explanations for this effect are considered: (1) the light-travel time effect due to the presence of a third body orbiting the eclipsing systems; (2) the Applegate mechanism predicting period modulation by changes in the distribution of angular momentum as a star goes through its activity cycles. It was found that in the case of four systems the existence of a third star, orbiting the binary, is a more plausible explanation of observations.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Planets and brown dwarfs orbiting evolved binaries
Autorzy:
Mikulášek, Z.
Qian, S.-B.
Zejda, M.
Zhu, L.-Y.
Zhou, X.
Zoła, Stanisław
Han, Z.-T.
Liao, W.-P.
Lajús, E. F.
Wydawca:
Astronomical Society of the Pacific
Opis:
Searches for planets and brown dwarf companions to evolved close binary stars (e.g., detached WD+dM binaries, sdB-type eclipsing binaries, magnetic CVs, and X-ray binaries) can provide insight into the formation and ultimate fate of circumbinary planets and brown dwarfs, as well as shed light on the late evolution of binary stars. The eclipse timing method has most successfully been applied to detect extrasolar planets around binary stars evolved beyond the first red-giant branch. We have monitored different types of evolved eclipsing binaries using this method since 2006. In this paper we review some observational results of circumbinary planets and brown dwarfs orbiting evolved binaries, especially those orbiting sdB-type eclipsing binaries. The fate of the Earth in our solar system is discussed by a comparison of the observational properties of the close-in substellar objects orbiting sdB-type binaries with those of planets in our solar system.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Inne
Tytuł:
Social and family-related correlates of medical care utilization by asthmatic children in Upper Silesia, Poland
Autorzy:
Zejda, J.E.
Brozek, G.M.
Farnik, M.
Smolka, I.
Wydawca:
Instytut Medycyny Wsi
Powiązania:
https://bibliotekanauki.pl/articles/49982.pdf  Link otwiera się w nowym oknie
Opis:
Background: Studies on childhood asthma demonstrate socioeconomic disparities in medical care utilization. A lack of information for Poland prompted our investigation into this question. Its goal was to discover if the utilization of medical services by asthmatic children depends on social and family factors. Methods: Subjects were 186 children with physician-diagnosed asthma, identified through a questionnaire survey of 4,535 school children in Katowice District, Poland. Utilization of medical care was assessed by such past year events as medical visits (44.0%), any diagnostic test (35.4%) and spirometry (30.6%). Association of those events with socioeconomic variables was explored by means of logistic regression, according to the criterion p≤ 0.1. Results: After adjustment for disease severity and gender medical visits were related to younger age (p=0.009), family history of respiratory diseases (p=0.08) and rural residence (p=0.09), any diagnostic tests to younger age (p=0.08), smaller number of siblings (p=0.01) and rural residence (p=0.004); spirometry to smaller number of siblings (p=0.09) and rural residence (p=0.006). Conclusion: Clinical status and age are important determinants of utilization of medical services by asthmatic children. The effects of rural residence and family size may reflect a more attentive response to the needs of a sick child.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of residential proximity to traffic on respiratory disorders in school children in upper Silesian Industrial Zone, Poland
Autorzy:
Skrzypek, Michał
Zejda, Jan E.
Kowalska, Małgorzata
Czech, Elżbieta M.
Tematy:
air pollution
road traffic
children
respiratory health
asthma
allergic rhinitis
Pokaż więcej
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Powiązania:
https://bibliotekanauki.pl/articles/2179793.pdf  Link otwiera się w nowym oknie
Opis:
Objective: A number of studies show an association between traffi c-related air pollution and adverse respiratory health effects in children. However, most evidence relates to the regions with low or moderate levels of ambient air pollution. The study was undertaken to assess the impact of traffi c-related air pollution on respiratory health status in children living in the area of high levels of industrial and municipal ambient air pollution. Materials and Methods: Analyses involved data obtained from cross-sectional study on respiratory health in children (N = 5733), conducted between 2003–2004 in Bytom, one of the largest cities of Silesian Metropolis (Poland). Exposure to traffic-related air pollution was assessed by means of geographic information system and expressed as several measures of potential exposure to traffic-related air pollution, involving residential distance to major road and traffic density in the residential area. Logistic regression was used to examin association between reported respiratory health and traffic measures. Results: Statistically signifi cant association was found between doctor-diagnosed asthma and residential proximity to traffic. Results of multivariate logistic regression (logOR; 95%CI) confi rmed the effect of living in an area of a city with high-traffic-density on childhood asthma: 1.60 (1.07–2.39). Similar effects were found in case of allergic rhinitis and rhinitis symptoms, but the observed associations were not statistically signifi cant. Conclusion: The study fi ndings suggest that even in an area with poor regional ambient air quality, adverse respiratory health outcomes are more frequent in children living in a proximity to the high vehicle traffic flow
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Underdiagnosis of childhood asthma: A comparison of survey estimates to clinical evaluation
Autorzy:
Brożek, Grzegorz M.
Farnik, Małgorzata
Lawson, Joshua
Zejda, Jan E.
Tematy:
children
asthma
clinical epidemiology
underdiagnosis
Pokaż więcej
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Powiązania:
https://bibliotekanauki.pl/articles/2179065.pdf  Link otwiera się w nowym oknie
Opis:
Objectives: Diagnostic patterns play a role in asthma prevalence estimates and could have implications for disease management. We sought to determine the extent to which questionnaire-derived estimates of childhood asthma reflect the disease's true occurrence. Materials and Methods: Children aged 6-12 years from Katowice, Poland, were recruited from a crosssectional survey (N = 1822) via primary schools. Students were categorized into three mutually exclusive groups based on survey responses: "Asthma" (previously diagnosed asthma); "Respiratory symptoms" (no previous diagnosis of asthma and one or more respiratory symptoms during last year), "No respiratory symptoms" (no previous diagnosis of asthma or respiratory symptoms). A sample of children from each group (total N = 456) completed clinical testing to determine asthma presence according to GINA recommendations. Results: Based on the survey, 5.4% of children were classified with asthma, 27.9% with respiratory symptoms, and 66.7% with no respiratory symptoms or asthma. All previously known 41 cases of asthma were confirmed. New diagnoses of asthma were made in 21 (10.9%) and 8 (3.6%) of subjects from the "Respiratory symptoms" (N = 192) and "No respiratory symptoms" (N = 223) groups, respectively. The overall prevalence of childhood asthma, incorporating the results of clinical examination, was 10.8% (95% CI: 9.4-12.2), compared to the questionnaire-derived figure of 5.4% (95% CI: 4.4-6.5%) and affected females more than males. Conclusions: Asthma prevalence was underestimated in this population possibly resulting from under-presentation or under-diagnosis. This could have potential implications for proper management and well-being of children. Questionnaire estimates of prevalence should be considered carefully in the context of regional diagnostic patterns.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Socio-demographic factors related to under-diagnosis of childhood asthma in Upper Silesia, Poland
Autorzy:
Zejda, Jan E.
Farnik, Małgorzata
Smółka, Irena
Lawson, Joshua
Brożek, Grzegorz M.
Tematy:
childhood asthma
under-diagnosis
socio-economic factors
Pokaż więcej
Wydawca:
Instytut Medycyny Wsi
Powiązania:
https://bibliotekanauki.pl/articles/989839.pdf  Link otwiera się w nowym oknie
Opis:
Introduction. The presented study of 4,535 children aged 7–17 years in the Upper Silesian region of Poland yielded 186 cases of previously known asthma, and 44 children with newly diagnosed asthma. The aim of the presented study was to identify non-medical factors that could explain why children with a newly established diagnosis (‘undiagnosed asthma’) had not been diagnosed in the past. Materials and method. The study was performed according to a case-control design. Parents of the children answered questionnaires on socio-economic status and family-related factors. Statistical determinants of undiagnosed asthma were explored using raw (OR) and logistic odds ratios with their 95% confidence intervals (logOR, 95%CI). Results. Children with undiagnosed asthma were younger compared to the group with previously known asthma (11.3±2.1 vs. 12.6±2.5 years; p=0.0008). Newly diagnosed cases were more frequent in children who had less parental attention (less than 1 hour/day spent by parent with child – OR=4.36; 95%CI: 1.76–10.81) and who were not registered with specialized health care (OR=2.20; 95%CI: 0.95–5.06). Results of logistic regression analysis suggest that under-diagnosis of asthma is related to age below 12 years – logOR = 3.59 (95%CI: 1.28–10.36), distance to a health centre > 5 km – logOR = 3.45 (95%CI: 1.05–11.36), time spent with child < 1 hour/day – logOR = 6.28 (95%CI: 1.98–19.91). Conclusion. Among non-medical determinants of undiagnosed asthma the age of a child plays a major role. Another factors of importance is the large distance between residence and health centre, and low parental attention at home.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of road traffic noise on sleep disturbances and attention disorders amongst school children living in Upper Silesian Industrial Zone, Poland
Autorzy:
Skrzypek, Michał
Kowalska, Małgorzata
Czech, Elżbieta M.
Niewiadomska, Ewa
Zejda, Jan E.
Tematy:
sleep
child
noise
attention
transportation
automobiles
Pokaż więcej
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Powiązania:
https://bibliotekanauki.pl/articles/2161870.pdf  Link otwiera się w nowym oknie
Opis:
Objectives Published reports suggest that some adverse health impact may be related to noise exposure, and motor vehicle traffic is considered to be the main source of environmental hazard of noise. The aim of this study has been to assess an association between occurrence of sleep and attention disorders with exposure to the noise generated by motor vehicle traffic in the case of a large group of children living in an urban environment. Material and Methods The data was obtained using a cross sectional study design in Bytom (Silesia, Poland) from 2003–2007 for a selected group of 7–14 year olds (N = 5136). The geographic information system was used for assessing the exposure to noise generated by the motor vehicle traffic. The association between occurrences of sleep disturbances or attention disorders and exposure to the traffic noise was examined by means of multivariable logistic regression. Results Sleep disturbances and attention disorders were found to be statistically significantly associated with exposure to the traffic noise. The multivariable logistic regression results suggest that sleep disturbances and attention disorders were more likely to occur in the case of children living in the area with higher traffic density, the odds ratio (OR) = 1.44 (95% confidence interval (CI): 1.05–1.97) and 1.38 (95% CI: 1.03–1.86), respectively. Conclusions The results of the study have confirmed that the exposure to the traffic noise could be a significant risk factor for sleep disturbances and attention disorders among children. Int J Occup Med Environ Health 2017;30(3):511–520
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 13

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