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High-precision photometry by telescope defocusing - VII. The ultrashort period planet WASP-103
Southworth, J.,Mancini, L.,Ciceri, S.,Budaj, J.,Dominik, M.,Figuera Jaimes, R.,Haugbolle, T.,Jorgensen, U. G.,Popovas, A.,Rabus, M.,Rahvar, S.,von Essen, C.,Schmidt, R. W.,Wertz, O.,Alsubai, K. A.,Boz Oxford University Press 2015 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.447 No.1
Mancini, L.,Giacobbe, P.,Littlefair, S. P.,Southworth, J.,Bozza, V.,Damasso, M.,Dominik, M.,Hundertmark, M.,Jørgensen, U. G.,Juncher, D.,Popovas, A.,Rabus, M.,Rahvar, S.,Schmidt, R. W.,Skottfelt, J.,S EDP Sciences 2015 Astronomy and astrophysics Vol.584 No.-
<P>Context. Photometric monitoring of the variability of brown dwarfs can provide useful information about the structure of clouds in their cold atmospheres.The brown-dwarf binary system Luhman16AB is an interesting target for such a study, because its components stand at the L/T transition and show high levels of variability. Luhman16AB is also the third closest system to the solar system, which allows precise astrometric investigations with ground-based facilities. Aims. The aim of the work is to estimate the rotation period and study the astrometric motion of both components. Methods. We have monitored Luhman16AB over a period of two years with the lucky-imaging camera mounted on the Danish 1.54m telescope at La Silla, through a special i + z long-pass filter, which allowed us to clearly resolve the two brown dwarfs into single objects. An intense monitoring of the target was also performed over 16 nights, in which we observed a peak-to-peak variability of 0.20±0.02mag and 0.34±0.02mag for Luhman16A and 16B, respectively. Results. We used the 16-night time-series data to estimate the rotation period of the two components. We found that Luhman16B rotates with a period of 5.1 ±0.1h, in very good agreement with previous measurements. For Luhman16A, we report that it rotates more slowly than its companion, and even though we were not able to get a robust determination, our data indicate a rotation period of roughly 8h. This implies that the rotation axes of the two components are well aligned and suggests a scenario in which the two objects underwent the same accretion process. The 2-year complete data set was used to study the astrometric motion of Luhman16AB. We predict a motion of the system that is not consistent with a previous estimate based on two months of monitoring, but cannot confirm or refute the presence of additional planetary-mass bodies in the system.</P>
Popova, E,Bukhov, N,Popov, A,Kim, H H Royal Veterinary College 2010 Cryo letters Vol.31 No.5
<P>In this study, cryopreservation of Bratonia (Miltonia flavescens (Lindl.) Lindl. × Brassia longissima (Reichb.) Nash), a hybrid tropical orchid, was achieved using protocorm-like bodies (PLBs) multiplied in vitro. Cryopreservation was performed using a vitrification protocol including pretreatment of PLBs with a loading solution (LS, 2.0 M glycerol + 0.4 M sucrose) for 15 min followed by treatment with modified PVS2 vitrification solution (containing PEG instead of ethylene glycol) for 1 h. Increasing benzyladenine (BA) concentration in the recovery medium to 5.0 or 10.0 mg per liter during the initial 3 weeks after rewarming provided 20.4 percent post-cryopreservation regrowth. By contrast, preliminary culture of PLBs with abscisic acid (ABA) and high sucrose concentrations (up to 0.3 M) as well as addition of reduced glutathione during the preculture, loading and post-culture steps were not beneficial. Forty to 45 plants were regenerated from each PLB which withstood cryopreservation. No morphological differences were observed between plants regenerated from cryopreserved and untreated PLBs. Investigations into the functional activity of photosystems I and II in PLBs suggest that electron transport was retained in the reaction centers of both photosystems shortly after cryopreservation.</P>
Popova, Alla,Sinenko, Oksana,Prokopenko, liudmyla,Dorofieieva Veronika,Broiako, Nadiia,Danylenko, Olha,Vitkalov, Serhii International Journal of Computer ScienceNetwork S 2021 International journal of computer science and netw Vol.21 No.4
The article considers aspects of improving the quality of training of specialists based on the use of modern information and communication technologies in the educational process; the use of teaching methods and, as a result, an increase in the creative and intellectual components of educational activities; integration of various types of educational activities (educational, research, etc.); adaptation of information technology training to individual the characteristics of the student; ensuring continuity and consistency in learning; development of information technologies for distance learning; improving the software and methodological support of educational process.
Revision of the Old World Daphnia (Ctenodaphnia) similis group Cladocera: Daphniidae)
POPOVA, EKATERINA V.,PETRUSEK, ADAM,KOŘ,Í,NEK, VLADIMÍ,R,MERGEAY, JOACHIM,BEKKER, EUGENIYA I.,KARABANOV, DMITRY P.,GALIMOV, YAN R.,NERETINA, TATYANA V.,TAYLOR, DEREK J.,KOTOV, ALEXEY Magnolia Press 2016 Zootaxa Vol.4161 No.1
Petya Popova,Fernando Malalana,Simon Biddolph,Tiago Ramos,Mohit Parekh,Julian Chantrey,Sajjad Ahmad 대한수의학회 2022 Journal of Veterinary Science Vol.23 No.4
Background: The corneal and limbal morphology relevant to corneal epithelial maintenance in ten different species was examined using histological methods. Objectives: The presence of a Bowman’s layer, limbal epithelial cell, and superficial stromal morphology was examined in the following species to evaluate the differences in corneal thickness and epithelium: Java sparrows, frogs, macaws, spoonbills, red pandas, penguins, horses, Dobermans, orangutans, and humans. Methods: Corneal sections (4 μm) were obtained from ten ocular globes from three different animal classes: Aves, Amphibia, and Mammalia. All sections were stained with hematoxylin and eosin and periodic acid-Schiff reaction. After microscopy, all stained slides were photographed and analyzed. Results: Significant morphological differences in the corneal and limbal epithelia and their underlying stroma between species were observed. The number of corneal epithelial cell layers and the overall corneal epithelial thickness varied significantly among the species. The presence of a Bowman’s layer was only observed in primates (orangutans and humans). Presumed supranuclear melanin caps were noted in four species (orangutans, macaws, red pandas, and horses) in the limbal basal epithelial layer (putative site of corneal epithelial stem cells). The melanin granules covered the apex of the cell nucleus. Conclusions: Supranuclear melanin capping has been described as a process within the epidermis to reduce the concentration of ultraviolet-induced DNA photoproducts. Similarly, there may be a relationship between limbal stem cell melanin capping as a protective mechanism against ultra-violet radiation.
Formation of Metastable Aluminides in Al–Sc–Ti (Zr, Hf) Cast Alloys
E. Popova,P. Kotenkov,A. Shubin,I. Gilev 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.10
The effect of the ternary alloys composition and overheating of their melts (at 100–370 K above the liquidus temperature)on the morphology and composition of aluminides in the Al–Sc–Ti, Al–Sc–Zr, Al–Sc–Hf systems were investigated. It wasshown that during the crystallization of these melts under certain conditions, the primary precipitated phase are the complexaluminides Al3(ScxZr1−x), Al3(ScxTi1−x), Al3(ScxHf1−x) having a metastable cubic lattice with L12 structure, which matchesthe α-Al structural type. The variety of growth forms of aluminides is explained by a combination of a number of factors:the magnitude of overheating of the melt, the difference in the diffusion coefficients of transition metals, and the local concentrationof transition metals in the respective growth zones.
The Image of Japan in Tsarist Russia
Ariadna Popova 서울행정학회 2005 서울행정학회 학술대회 발표논문집 Vol.- No.-
In Tsarist Russia, the development of perceptions about Japan went alongside socio-cultural changes. The image of Japan developed as the image of "Other" within specific intercultural dialogue where the state had a leading role in accumulation of, and reflection on, the information about Japan in Russia. This paper examines the development of the image of Japan in social, political and cultural discourses of Tsarist Russia throughout the eighteenth, nineteenth and early twentieth centuries. In particular, the paper focuses on the reflection of representation of Japan in Russian foreign and domestic policy, in the intellectual life and in Art of Russian Modem.