355 research outputs found
Fourier convolutional decoder: reconstructing solar flare images via deep learning
No full textReconstructing images from observational data is a complex and time-consuming process, particularly in astronomy, where traditional algorithms like CLEAN require extensive computational resources and expert interpretation to distinguish genuine features from artifacts, especially without ground truth data. To address these challenges, we developed the Fourier convolutional decoder (FCD), a custom-made overcomplete autoencoder trained on simulated data with available ground truth. This enables the network to generate outputs that closely approximate expected ground truth. The model’s versatility was demonstrated on both simulated and observational datasets, with a specific application to data from the spectrometer/telescope for imaging X-rays (STIX) on the solar orbiter. In the simulated environment, FCD’s performance was evaluated using multiple-image reconstruction metrics, demonstrating its ability to produce accurate images with minimal artifacts. For observational data, FCD was compared with benchmark algorithms, focusing on reconstruction metrics related to Fourier components. Our evaluation found that FCD is the fastest imaging method, with runtimes on the order of milliseconds. Its computational cost is comparable to the most efficient reconstruction algorithm and 280× faster than the slowest imaging method for single-image reconstruction on a CPU. Additionally, its runtime can be reduced by an order of magnitude for multiple-image reconstruction on a GPU. FCD outperforms or matches state-of-the-art methods on simulated data, achieving a mean MS-SSIM of 0.97, LPIPS of 0.04, PSNR of 35.70 dB, a Dice coefficient of 0.83, and a Hausdorff distance of 5.08. Finally, on experimental STIX observations, FCD remains competitive with top methods despite reduced performance compared to simulated data
Can van der Waals constants be used in the chemical reactivity analysis? A new approach as a support to minimum magnetizability principle
No full textOne of the most important purposes of theoretical chemists is to derive new, useful, and reliable equations to compute the well-known parameters like hardness, polarizability, magnetizability, and electrophilicity providing enough hints for the reactivity analysis of the chemical systems. In the derivation of such equations, our research team widely considers the popular electronic structure rules like electronegativity equalization, maximum hardness, minimum polarizability, minimum magnetizability, and minimum electrophilicity principles. Recently, in the light of maximum entropy and minimum magnetizability principles, Kaya and Chattaraj (2021) presented a simple way to calculate their standard absolute entropies (S-298(0)) based on molar diamagnetic susceptibilities (chi(m)) of inorganic ionic systems. In the present paper, a new and useful molar diamagnetic susceptibility calculation method including the use of van der Waals constants (a and b) is introduced. Here, we named this method as Kaya-Simsek approach. Through the relations between molar diamagnetic susceptibility and van der Waals constants, we can easily predict the magnetic susceptibility of molecules that their magnetic susceptibilities are unknown. The results of the equations derived are quite close to experimentally reported data. The analyses made proved that van der Waals constants can be considered as chemical reactivity descriptors. We propose that in stable states, van der Waals constants are minimized. The validity of minimum magnetizability principle is supported with solid evidences
Transnational Migration and The Role of Religious Education in Social Adaptation: Example of Ahiska Turks in Erzincan Uzumlu
No full textThe sinister fate of Ahiska Turks started with the 1829 Treaty of Edirne. They have been exiled many times since the Stalin era and subjected to oppression and persecution both in their homeland and in their exile areas. Finally, in 2015, after the internal turmoil and conflicts in Ukraine, Ahiskals were placed in Erzincan Uzumlu district. Even though they are Turkish nobles and Muslims, difficulty arose during the adaptation process of Ahiska people to Uzumlu as in any immigration. In this study, the role of religion and, more specifically, religious education in the social cohesion process was discussed through the example of Ahiskals in Uzumlu. Based on the cultural and social cohesion indicators of Castles, the data obtained by using qualitative method and semi- structured interview and participant observation techniques were analyzed by discourse analysis method. Castles' research shows that religious unity and especially the environment in which religious education is studied play an important role in the cultural cohesion process of two different societies. The social adaptation and integration of the Ahiska people as they establish their belonging to the Turkish society and to Uzumlu in particular, has revealed the importance of religion and religious education. Similarly, the negative thoughts of the local people towards the people of Ahiska, such as access to opportunities, inequality of opportunity, have changed positively through religious education. Finally, the fact that the role of religious education in social cohesion has not been addressed in any study before reveals the original value of the study
Adsorption properties of lignin containing bentonite-polyacrylamide composite for UO22+ ions
No full textAs a new material, a composite of polyacrylamide (PAA)-Bentonite (B) containing Lignin (L) was synthesized and adsorption properties of this new material was studied for the removal of uranyl ions from solution. The material was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction, and PZC analysis. The effects of experimental variables such as concentration, pH, ionic strength, temperature, and kinetic of adsorption were investigated. The adsorption data were analyzed using the Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich (DR) equations. The adsorption process is evaluated with pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion models. The Q(L) (molkg(-1)) and K-L (L mol(-1)) values for adsorption from solution were 0.314 and 1,321 for PAA-B-L. This investigation showed that the new developed material can be used for the removal of UO22+ ions from aquatic solutions.Cumhuriyet University Scientific Research Projects CommissionThe present study was partly supported by Cumhuriyet University Scientific Research Projects Commission. The author gratefully thanks Prof Dr Huseyin Yalcn for comments of XRD spectra
New formulae for Zagreb indices
No full textInternational Conference on Numerical Analysis and Applied Mathematics (ICNAAM) -- SEP 19-25, 2016 -- Rhodes, GREECEIn this paper, we study with some graph descriptors also called topological indices. These descriptors are useful in determination of some properties of chemical structures and preferred to some earlier descriptors as they are more practical. Especially the first and second Zagreb indices together with the first and second multiplicative Zagreb indices are considered and they are calculated in terms of the smallest and largest vertex degrees and vertex number for some well-known classes of graphs.Uludag UniversityUludag University [F-2015/17, F-2015/23]; Selcuk UniversitySelcuk UniversityThe first author was supported by the Research Fund of Uludag University project no: F-2015/17, F-2015/23. The last author is supported by Selcuk University Research Fund
FASIH AHMED DEDE'S MASNAVI BEHIST-ABAD
No full textIn this article, 17th century Mevlevi poet Fasih Ahmed Dede's masnavi Behis-abad the copies of which was not detected so far was introduced. Masnavi written at 1698, was prepared as traditional mesnevi arrangement. In this moral mesnevi which consists of 1229 couplet; the themes are about real friendship and fidelity. Besides, the author focused on the form and content features of the masnavi
Durability of a single successful endoscopic polytetrafluoroethylene injection for primary vesicoureteral reflux: 14-year followup results
No full textPurpose: We reviewed our 14-year experience with successful single endoscopic subureteral polytetrafluoroethylene injection for the treatment of primary vesicoureteral reflux in children. Materials and Methods: We retrospectively reviewed the charts of 42 patients with primary vesicoureteral reflux who were treated with a single successful subureteral polytetrafluoroethylene injection between 1989 and 1993 and followed with routine 1, 3 and 10-year voiding cystourethrography. Results: The study included 30 girls and 12 boys 2 to 14 years old (median age 6 years). Four patients were lost to followup. Of the 38 remaining patients 28 had unilateral and 10 had bilateral primary vesicoureteral reflux. Endoscopic treatment with subureteral. polytetrafluoroethylene injection was performed in 48 ureters. Followup ranged from 10 to 14 years (mean 12.5 +/- 2.1). Voiding cystourethrography in 38 patients and 48 ureters revealed that 35 ureters (73%) remained free of reflux, whereas reflux recurred in 13 (27%) at a median of 2 years. Of these 13 ureters recurring reflux was grade I to II in 5 and grade III to V in 8. Reflux recurred in 11 of 24 ureters with grade IV to V reflux. Of the 13 recurrences 10 presented as febrile urinary tract infections and only 3 grade I recurrences were detected on voiding cystourethrography alone. No untoward effects were seen in any of these patients with injection of polytetrafluoroethylene. Conclusions: Long-term followup may be warranted after a single successful endoscopic injection for vesicoureteral reflux, particularly high grade reflux. However, followup voiding cystourethrography is unnecessary in patients presenting with febrile urinary tract infection
Copies of the poem siret written by Muhammad in the XVth century-I
No full text"Siret", more commonly called "siyer", is the general name of the works on the life of the Prophet. At first, the word "siret", which was used for such works, was commonly used as "siyer". "Siret / siyer", whose first examples were in Arabic literature, begins to be seen in Turkish literature in XIVth century. First known in Turkish literature is Siretuzn-nebi, written in verse and prose by Darir in the second half of the XIVth century. the first example of what is known today is the Siret, which is a subject written by an author named Muhammed in the XVth century. the work is around 15,500 couplets. the fact that there are many archaic words in the book makes it important for Turkish language and literature. From the beginning of 872[1467] when Siret was written, many copies and stone print have been made. This shows that it has been loved and read a lot. However, none of the sixty-nine copies identified yielded the work of Muhammad's style. It is seen that some copiers and stone printers of Siret put their names by removing the name of the author. It is understood that a change of this kind is due to the desire to own the work. in this article, the copies of Siret will be introduced in Turkey and abroad. the evaluation of the studies and copies will be the subject of the next article
CORRUPTED MAGIC TO ENCHANT THE WORLD
No full textIn this study, a book about Corrupted Magic to enchant the world which was written by George Ritzer, is introduced. A life centered on the axis of consumption of the modern era is the general subject of the book. We are in an ongoing cycle consumption consumption by author said that we live in society. An environment for consumption of social life at every moment being created. A continuous consumption of the community with new tools withdrawal consumption is concerned. Fashion, brand, advertising and consumption with luxury elements is kept alive each year
A LITERARY GENRE UNKNOWN SUFFICIENTLY IN THE CLASSICAL LITERATURE: RUZNAME AND AN EXAMPLE OF IT BY AN UNKNOWN AUTHOR
No full textClassical Turkish literature is a kind of literature which based on poetry. Almost everything that is meant to be told in this literary traditon has been expressed in verse. For this reason, many different genres which include different subjects were written up in poetic way. In this study, an example of the type of ruz-name, which is rarely encountered and less known in the classical literture tardition, is discusssed. The word ruz-name, which means daily writing in Persian, has been used in Turkish historyand culture to cover more than one different genre in different fields. One of them is a literary genre that is about to days of the month or week, in which mentions what is genarally good to do and what is bad to do in these time periods.In this ruz-name, which were analysed, seven days of the week were discussed. In ruz-name daytimes were divided into seven parts; dawn, mid-morning, decadence of day, midday, interval between two prayers, mid-afternoon and sunset. Nighttime also divided into seven parts; occident, evening, ishareyn, midnight, suluseyn, sulusurl-ahir and aurora. By telling which celestial body is dominant on which day of the week at these time periods, the auspicious and omnious deeds at that time are explained
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