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Analytical fits to the synchrotron functions

Research in Astronomy and Astrophysics 2013年第6期13卷 680-686页

作者： mourad fouka Saad Ouichaoui Research Center in Astronomy Astrophysics and GeophysicsB. P. 63 Algiers ObservatoryBouzaréah Algiers Algeria Université des Sciences et de la Technologie Houari Boumediène (USTHB) Faculté dePhysique Laboratoire SNIRMB.P. 32 El-Alia 16111 Bab Ezzouar Algiers Algeria

Accurate fitting formulae to the synchrotron function, F（x）, and its com- plementary function, G（x）, are performed and presented. The corresponding relative errors are less than 0.26% and 0.035% for F（x） and G（x）, respectively. To this end we have, first, fitted the modified Bessel functions, Ks/3（x） and K2/3（x）. For all the fitted functions, the general fit expression is the same, and is based on the well known asymptotic forms for low and large values of z for each function. It consists of multi- plying each asymptotic form by a function that tends to unity or zero for low and large values of z. Simple formulae are suggested in this paper, depending on adjustable parameters. The latter have been determined by adopting the Levenberg-Marquardt algorithm. The proposed formulae should be of great utility and simplicity for com- puting spectral powers and the degree of polarization for synchrotron radiation, both for laboratory and astrophysical applications.

关键词： radiation processes: non thermal -- methods: analytical

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Burnout and Its Association with Working Conditions among Greek Hospital Nurses in a Time of Financial Crisis

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Open Journal of Nursing 2014年第7期4卷 548-563页

作者： Asterios Skefales Sotirios Plakas Georgia fouka Maria Goni Maria Vassiliadou Joanna-Despoina Bergiannaki Department of Nursing School of Health and Welfare Technological Educational Institution (TEI) of Athens Athens Greece Psychiatric Ward Georgios Genimatas General District Hospital of Athens Athens Greece University of Athens 1st Psychiatric Clinic Eginition Hospital Athens Greece University of Athens Eginition Hospital Athens Greece

The recent global economic recession has affected nursing working conditions in terms of salary reductions, increased workload and staff shortages. Poor nursing working conditions are associated with higher levels of burnout. However in Greece this association has not yet been studied. The aim of this study was to explore financial crisis related changes in nurses’ working conditions and their associations with burnout. A cross-sectional quantitative survey was conducted and data were collected through self-reported questionnaires from 299 Greek nurses from two Public Hospitals in 2012. Multiple linear regression analyses were used in order to find independent factors associated with burnout. The results showed that Greek nurses had high levels of burnout. Satisfaction from the job, quality of care and feeling equivalent with other professionals were independent predictors of lower emotional exhaustion. Workload increase and willingness to change career and work department were independent predictors of higher emotional exhaustion. Job satisfaction and satisfaction from care quality were independent predictors of lower depersonalization. Changes in working relationships and willingness to change career were independent predictors of higher depersonalization. Higher personal accomplishments were independently associated with more years in nursing, satisfaction from the salary prior to reductions, better quality of care, feeling suitable for the job and being anxious about future career. Influence on nurse efficiency by income reduction was an independent predictor of lower personal accomplishments. In conclusion, Greek nurses were suffering from high levels of burnout which was independently associated with crisis related working conditions. Interventions are needed in order to reduce the burden of burnout among Greek nurses.

关键词： Burnout Austerity Nurse Practice Environment Maslach Burnout Inventory

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Validation of the 8-Item Morisky Medication Adherence Scale in Chronically Ill Ambulatory Patients in Rural Greece

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Open Journal of Nursing 2016年第3期6卷 158-169页

作者： Sotirios Plakas Dimos Mastrogiannis Marianna Mantzorou Theodoula Adamakidou Georgia fouka Angeliki Bouziou Chrysoula Tsiou Donald E. Morisky Department of Nursing Technological Educational Institution (TEI) of Athens Athens Greece Research Unit for Nursing Rehabilitation of the Chronically Ill Technological Educational Institution (TEI) of Athens Athens Greece Department of Nursing Technological Educational Institute of Central Greece Lamia Greece General Hospital of Aitoloakarnania Agrinion Greece Department of Community Health Sciences UCLA Fielding School of Public Health Los Angeles CA USA

Objective: To validate a Greek version of the structured self-reported 8-item Morisky Medication Adherence Scale (MMAS-8) and determine its psychometric properties in patients with chronic illnesses. Methods: A cross-sectional survey was conducted in a small public hospital and a public health care centre, in a rural town in western Greece. The sample consisted of 100 patients with various chronic illnesses. Data were collected between January-May 2011, on the Greek version of the MMAS-8 and Beliefs about Medicines Questionnaire (BMQ). Results: Scale’s reliability analysis revealed an overall Cronbach’s alpha of 0.753 and the corrected item to total correlations, were greater than 0.30 for each of the 8 items comprising the medication adherence scale, showing good internal consistency. Convergent validity was supported by a significant correlation between the present scale’s total score and the BMQ-Specific Necessity score (Spearman’s rho = 0.492, p < 0.001). Conclusion: The current study showed acceptable reliability and validity of the Greek version of the 8-item MMAS to measure adherence to medications for various chronic illnesses. The validated Greek version of the MMAS-8 can help towards understanding adherence barriers in Greece so as to develop effective strategies to increase adherence and reduce the costs.

关键词： Adherence Validation Chronic Illnesses Morisky MMAS-8 Scale

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