Q2237+0305 source structure and dimensions from light curves simulation

Assuming a two-component quasar structure model consisting of a central compact source and an extended outer feature, we produce microlensing simulations for a population of star-like objects in the lens galaxy. Such a model is a simplified version of that adopted to explain the brightness variations observed in Q0957 (Schild & Vakulik 2003). The microlensing light curves generated for a range of source parameters were compared to the light curves obtained in the framework of the OGLE program. With a large number of trials we built, in the domain of the source structure parameters, probability distributions to find "good" realizations of light curves. The values of the source parameters which provide the maximum of the joint probability distribution calculated for all the image components, have been accepted as estimates for the source structure parameters. The results favour the two-component model of the quasar brightness structure over a single compact central source model, and in general the simulations confirm the Schild-Vakulik model that previously described successfully the microlensing and other properties of Q0957. Adopting 3300 km/s for the transverse velocity of the source, the effective size of the central source was determined to be about 2x10^15 cm, and Epsilon =2 was obtained for the ratio of the integral luminosity of the outer feature to that of the central source.Comment: 7 pages, 4 figures, LaTe

Risk Factors for Hypoxic-Ischemic Encephalopathy in Full-Term Neonates

Hypoxic-ischemic encephalopathy (HIE) is a clinically defined syndrome of disturbed neurological function in the earliest days of life in the term infants manifested by respiratory distress, subnormal level of consciousness, seizures and depression of tone and reflexes. The authors identified antepartum and intrapartum risk factors for HIE in full term newborns. Between January 1st, 2001 and December 31st, 2003, 54 term infants (gestational age >37 weeks) in NICU of the Clinic of Neonatology, Department of Obstetrics and Gynecology, Prof. Paraskev Stoyanov Medical University of Varna were retrospectively studied. All of them met the criteria for moderate or severe HIE (seizures, abnormal consciousness (stupor, coma), respiratory distress, difficulty feeding, abnormal tone and reflexes). Birth prevalence of moderate or severe neonatal HIE was 4,42% term live births. More important antepartum risk factors for HIE were infections, preeclampsia, bleeding in pregnancy, and postmaturity. HIE incidence in infants born after 42 weeks is by 2,5 fold higher. Significant intrapartum risk factors for HIE were intrapartum asphyxia (24% of cases with HIE - OR=6,91), operative vaginal delivery (OR=l,65) and emergency Caesarean section (OR=3,78). The study of the significant risk factors for HIE contributes to prevention of neonatal morbidity and mortality

Konus-Wind and Helicon-Coronas-F Observations of Solar Flares

Results of solar flare observations obtained in the Konus-Wind experiment from November, 1994 to December, 2013 and in the Helicon Coronas-F experiment during its operation from 2001 to 2005, are presented. For the periods indicated Konus-Wind detected in the trigger mode 834 solar flares, and Helicon-Coronas-F detected more than 300 solar flares. A description of the instruments and data processing techniques are given. As an example, the analysis of the spectral evolution of the flares SOL2012-11-08T02:19 (M 1.7) and SOL2002-03-10T01:34 (C5.1) is made with the Konus-Wind data and the flare SOL2003-10-26T06:11 (X1.2) is analyzed in the 2.223 MeV deuterium line with the Helicon-Coronas-F data.Comment: Published version. A list of the Konus-Wind solar flare triggers and figures of their time profiles are available at http://www.ioffe.ru/LEA/Solar

Thermal stability of the cellular structure of an austenitic alloy after selective laser melting

Published ArticleThe thermal stability of the cellular structure of an austenitic Fe–17% Cr–12% Ni–2% Mo–1% Mn–0.7% Si–0.02% C alloy produced by selective laser melting in the temperature range 20–1200°C is investigated. Metallographic analysis, transmission electron microscopy, and scanning electron microscopy show that structural changes in the alloy begin at 600-700°C and are fully completed at ~1150°C. Differential scanning calorimetry of the alloy with a cellular structure reveals three exothermic processes occurring upon annealing within the temperature ranges 450–650, 800–1000, and 1050–1200°

THE FORMATION OF MANAGERIAL COMPETENCE OF STUDENTS FUTURE SPECIALISTS OF PRESCHOOL EDUCATIONAL INSTITUTIONC

В статье обосновывается необходимость формирования управленческой компетентности у студентов будущих специалистов дошкольных образовательных учрежденийThis article substantiates the need for the formation of managerial competence among students of future specialists of preschool educational institution

Personal prerequisites for the psychological safety of Russian students in close intercultural interaction

The article is based on the data of an empirical study carried out in 2022 with the participation of 148 students of the MGIMO University – Russian’s citizens, one half of whom identified themselves as Russian, and the other attributed themselves to other ethnic groups. The personal prerequisites for psychological safety, which are characteristic of Russian students who define themselves as “Russian”, include: a normative variant of the development of five basic characteristics that make up the structure of a “normal” personality; tolerance as a personality trait; average and a lower authoritarianism index relative to the other group; components of self-actualisation – support, behavioural flexibility, cognitive needs; medium-developed subjectivity; adequate level of psychological defenses. The students – Russian citizens who attributed themselves to other ethnic groups, have: a normative version of the development of the five basic characteristics of a “normal” personality; an average overall level of tolerance and authoritarianism as well as self-actualisation; an adequately high level of belief in the fairness of the world, their good fortune and ability to control events; activity as a leading component of subjectivity; a willingness to establish a social distance with other ethnic groups that facilitates dialogue. Based on the results of the survey, personal preconditions that can cause inter-ethnic conflicts have been identified

Color Effects Associated with the 1999 Microlensing Brightness Peaks in Gravitationally Lensed Quasar Q2237+0305

Photometry of the Q2237+0305gravitational lens in VRI spectral bands with the 1.5-m telescope of the high-altitude Maidanak observatory in 1995-2000 is presented. Monitoring of Q2237+0305 in July-October 2000, made at nearly daily basis, did not reveal rapid (night-to-night and intranight) variations of brightness of the components during this time period. Rather slow changes of magnitudes of the components were observed, such as 0.08 mag fading of B and C components and 0.05 mag brightening of D in R band during July 23 - October 7, 2000. By good luck three nights in 1999 were almost at the time of the strong brightness peak of image C, and approximately in the middle of the ascending slope of the image A brightness peak. The C component was the most blue one in the system in 1998 and 1999, having changed its (V-I) color from 0.56 mag to 0.12 mag since August 1997, while its brightness increased almost 1.2 mag during this time period. The A component behaved similarly between August 1998 and August 2000, having become 0.47 mag brighter in R, and at the same time, 0.15 mag bluer. A correlation between the color variations and variations of magnitudes of the components is demonstrated to be significant and reaches 0.75, with a regression line slope of 0.33. A color (V-I) vrs color (V-R) plot shows the components settled in a cluster, stretched along a line with a slope of 1.31. Both slopes are noticeably smaller than those expected if a standard galactic interstellar reddening law were responsible for the differences between the colors of images and their variations over time. We attribute the brightness and color changes to microlensing of the quasar's structure, which we conclude is more compact at shorter wavelengths, as predicted by most quasar models featuring an energizing central source.Comment: 14 pages, 7 figures, LaTeX, submitted to A&