The Relationship Between Plasma Flow Doppler Velocities and Magnetic Field Parameters During the Emergence of Active Regions at the Solar Photospheric Level

A statistical study has been carried out of the relationship between plasma flow Doppler velocities and magnetic field parameters during the emergence of active regions at the solar photospheric level with data acquired by the Michelson Doppler Imager (MDI) onboard the Solar and Heliospheric Observatory (SOHO). We have investigated 224 emerging active regions with different spatial scales and positions on the solar disc. The following relationships for the first hours of the emergence of active regions have been analysed: i) of peak negative Doppler velocities with the position of the emerging active regions on the solar disc; ii) of peak plasma upflow and downflow Doppler velocities with the magnetic flux growth rate and magnetic field strength for the active regions emerging near the solar disc centre (the vertical component of plasma flows); iii) of peak positive and negative Doppler velocities with the magnetic flux growth rate and magnetic field strength for the active regions emerging near the limb (the horizontal component of plasma flows); iv) of the magnetic flux growth rate with the density of emerging magnetic flux; v) of the Doppler velocities and magnetic field parameters for the first hours of the appearance of active regions with the total unsigned magnetic flux at the maximum of their development.Comment: 14 pages, 8 figures. The results of article were presented at the ESPM-13 (12-16 September 2011, Rhodes, Greece, Abstract Book p. 102-103, P.4.13, http://astro.academyofathens.gr/espm13/documents/ESPM13_abstract_programme_book.pdf

Experience of percutaneous nephrolithotripsy of large kidney stones

Topicality. Kidney stone disease is referred to wide spread diseases. According to the literature data its prevalence is 732,8 cases per 100 000 of Ukrainian population. During the last years the usage of minimally invasive techniques, such as: extracorporeal shockwave lithotri psy (ESWL) and ureteroscopy with contact lithotri psy has significantly increased, but percutaneous lithotri psy (PNL) remains as a technique of choice among basic methods of treatment of large size kidney stones. The purpose of the work. To evaluate the effectiveness of the percutaneous shock wave lithotri psy (PNL) in treatment of kidney stones larger than 50 mm. Materials and methods. Twenty-eight patients, among them twentyfive (89,28%) male patients and three (10,71%) female patients, with large > 50 mm kidney stones treated in NMMCC from April 2016 to March 2020 were included to the research. Stonefree rate and complications rates were examined. Results. In thirteen cases (46.42%) the stones were located in the right kidney, in fifteen cases (53,57%) the stones were located in the left kidney. The nineteen patients (67,85%) did not have any residual stones, and nine patients (32,14%) had residual stones. The extracorporeal shock-wave lithotri psy had been performed in 4 patients (14%), in 5 (17%) cases – contact lithotri psy of residual stones, which migrated to the lower third part of the ureter. After repeated intervention in 5 cases (17,86%) stone-free status was obtained. Stone-free rate index was 85,71%. Average duration of operation was 115±24,64 min. Hemoglobin level before and after operative intervention was 142 (117–159) g/l and 119 (94–132) g/l respectively (ð <0,005). Length of hospital stay was 5,07 (4–9) days. Complications were observed in six patients (21,5%). Stone-free status was defined as absence of any residual stones during radioscopy at 1 day after the operation or during computer tomography after 3 months. Residual stones d ≤ 4 mm and > 4 mm were considered as insignificant and significant respectfully

Construction of a century solar chromosphere data set for solar activity related research

This article introduces our ongoing project “Construction of a Century Solar Chromosphere Data Set for Solar Activity Related Research”. Solar activities are the major sources of space weather that affects human lives. Some of the serious space weather consequences, for instance, include interruption of space communication and navigation, compromising the safety of astronauts and satellites, and damaging power grids. Therefore, the solar activity research has both scientific and social impacts. The major database is built up from digitized and standardized film data obtained by several observatories around the world and covers a timespan more than 100 years. After careful calibration, we will develop feature extraction and data mining tools and provide them together with the comprehensive database for the astronomical community. Our final goal is to address several physical issues: filament behavior in solar cycles, abnormal behavior of solar cycle 24, large-scale solar eruptions, and sympathetic remote brightenings. Significant progresses are expected in data mining algorithms and software development, which will benefit the scientific analysis and eventually advance our understanding of solar cycles