LABOR COURSE AND CONDITION OF NEWBORNS IN WOMEN WITH PLACENTAL DYSFUNCTION DUE TO GESTATIONAL ENDOTHELIOPATHY

The purpose of the study is to evaluate the effect of placental dysfunction caused by gestational endotheliopathy on the course of labor and the condition of the newborn. The first group consisted of 70 patients with placental dysfunction with gestational endotheliopathy confirmed by laboratory-instrumental findings in the first trimester of pregnancy. The control group included 30 pregnant women with physiological gestational course. PD secondary to GE leads to preterm birth, fetal distress, increases the percentage of caesarean section, contributes to the delay of fetal growth and birth weight, poor infant status and perinatal complications.The purpose of the study is to evaluate the effect of placental dysfunction caused by gestational endotheliopathy on the course of labor and the condition of the newborn. The first group consisted of 70 patients with placental dysfunction with gestational endotheliopathy confirmed by laboratory-instrumental findings in the first trimester of pregnancy. The control group included 30 pregnant women with physiological gestational course. PD secondary to GE leads to preterm birth, fetal distress, increases the percentage of caesarean section, contributes to the delay of fetal growth and birth weight, poor infant status and perinatal complications

Ultrasound investigation in pregnant women with diabetes mellitus

Introduction. Ultrasound (US) has been used in obstetrics for more than 30 years and is considered to be reliable, simple, quick in results, painless and cheap method. The aim: to optimize the use of US in childbirth in pregnant women with diabetes and determine the outcome of childbirth, taking into account the condition of the fetus and newborn. Materials and methods. 52 pregnant women, among them 32 with diabetes mellitus (pre-gestational diabetes was in 20 persons and 12 persons had gestational diabetes) have been examined.  The average age of pregnant women in the main group was 29.8 ± 5.4 years, in the control group - 25.7 ± 4.3 years. All women in the main and control groups were primiparous. The gestation period in the main group was 39.1 ± 0.5 weeks [38.0; 39.6], in the control group - 39.5 ± 0.7 [38.4; 40.5] weeks. Clinical-laboratory and instrumental examinations were made. Control group consisted of  20 physiologically pregnant women. To determine the condition and size of the fetus and its progress in labor, immediately at the end of the first and during the second staage of labor, transabdominal and transperineal US and Doppler examination were performed with device HD 11 XE Phillips (USA). Results. Pregnant women with diabetes are more likely to have a pathological second stage of labors due to macrosomia and problems with the birth of the fetus, as evidenced by the lack of increased angle of progress and decreased head-perineal distance. The data obtained indicate the prospects of using ultrasound in childbirth as an objective non-invasive method for predicting the likelihood of vaginal birth, which will reduce operative delivery and perinatal pathology. Conclusions. The use of ultrasound in childbirth in women with diabetes and diabetic fetopathy can determine the possibility of complications in the promotion of the fetus, including clinical narrow pelvis, shoulder dystocia, the occurrence of distress, as evidenced by the Apgar scale and CLS. Intraparietal ultrasound helps to guide the plan of childbirth, reduce the frequency of cesarean delivery, perinatal morbidity and mortality, and birth trauma

Structural features of Ni-Cr-Si-B materials obtained by different technologies

This study considers the structural features of Ni-Cr-Si-B (Ni - base; 15.1 % Cr; 2 % Si; 2 % B; 0.4 % C) materials obtained by different methods. The self-fluxing coatings were deposited by plasma spraying on the tubes from low carbon steel. Bulk cylinder specimens of 20 mm diameter and 15 mm height were obtained by spark plasma sintering (SPS). The structure and phase composition of these materials were investigated by optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffractometry (XRD). The major phases of coatings and sintered materials are [gamma]-Ni, Ni[3]B, CrB and Cr[7]C[3]. We demonstrate that the particle unmelted in the process of plasma spraying or SPS consist of [gamma]-Ni-NEB eutectic and also CrB and Cr[7]C[3] inclusions. The prolonged exposure of powder to high temperatures as well as slow cooling rates by SPS provide for the growth of the structural components as compared to those of plasma coatings materials. High cooling rates at the plasma spraying by melted particles contribute to the formation of supersaturated solid solution of Cr, Si and Fe in [gamma]-Ni. The structure of the melted particles in sintering material has gradient composition: the core constituted of Ni grains of 10 μm with [gamma]-Ni-Ni[3]B eutectic on the edges. The results of the experiment demonstrate that the sintering material has a smaller microhardness in comparison with plasma coatings (650 and 850 MPa, respectively), but at the same time the material has higher density (porosity less than 1 %) than plasma coatings (porosity about 2.. .3 %)

Russian Students’ Readiness for Distance Learning: Current Situation and Future Challenges

Данная исследовательская статья посвящена вопросу владения студентами технологиями дистанционного обучения, актуальность которого резко возросла в условиях коронавирусной пандемии. Есть основания полагать, что и после ее преодоления высшая школа будет все более активно использовать эти технологии. Целью проведенного авторами исследования являлась оценка готовности студентов российских вузов к использованию технологий дистанционного обучения. В ходе анкетирования 428 студентов, обучающихся в вузах г. Ростова-на-Дону, были собраны сведения о развитии у опрошенных навыков использования интернет-технологий в сфере образования. Результаты исследования показали, что в предпандемический период необходимыми навыками для участия в видеоконференциях владели не более четверти студентов, навыками для самостоятельного освоения онлайн-курсов – около 16 %. Владение обеими технологиями, обеспечивающее эффективное дистанционное обучение, имело место лишь у 6,5 % респондентов. Полученные сведения о связи успеваемости с самостоятельным участием в онлайн-курсах, а также о соотношении этих показателей с общей цифровой грамотностью и погруженностью в социальные сети следует учитывать при широкой цифровой трансформации образования в условиях пандемии.In the context of the COVID pandemic, there has dramatically increased the significance of distance learning technologies. Higher education will most probably increase their usage even after overcoming the coronavirus. This paper aims at assessing Russian university students’ readiness to exercise distance learning technologies. The survey within Rostov-on-Don universities provided data on 428 students’ skills in using Internet technologies when studying. It is shown that in the pre-pandemic period, no more than a quarter of students had the necessary skills to participate in video conferences, and about 16 % of students took online courses autonomously. Only 6,5 % of the respondents could manage both technologies that comprise distance learning. The results obtained on the relationship between academic performance and self-participation in online courses, as well as on the relationship of these indicators with general digital literacy and immersion in social networks, should be taken into account within wide computerization of education during the pandemic.Работа выполнена при финансовой поддержке Министерства науки и высшего образования РФ в рамках Постановления № 218 «Создание высокотехнологичного производства программного комплекса для управления человеческим капиталом на основе нейротехнологий для предприятий высокотехнологичного сектора Российской Федерации» (шифр 2019-218-11-8185). Также авторы статьи выражают признательность Южному федеральному университету, предоставившему площадку для организации онлайн-анкетирования.The survey was financially supported by the Ministry of Science and Higher Education of the Russian Federation (Decree No. 218 «Creation of a High-Tech Production of a Software Package for Human Capital Management Based on Neurotechnologies for Enterprises of the High-Tech Sector of the Russian Federation», 2019-218-11-8185). The authors are also grateful to Southern Federal University for having provided facilities to organize an online survey

A novel operando approach to analyze the structural evolution of metallic materials during friction with application of synchrotron radiation

In this study, we describe an experimental setup and a new approach for operando investigation of structural evolution of materials during wear and friction. The setup is particularly suited for testing various friction pairs, including those in which both rubbing bodies are made of metals. The developed device allows circumventing the problems related to significant scattering of X-rays produced by metals and makes it possible using “real samples” in synchrotron beamlines operating in reflection mode. To demonstrate the capabilities of the device and the proposed new approach, an iron-based massive sample was subjected to thousands of friction cycles using a cemented carbide pin. The material was probed with synchrotron X-ray radiation within a few milliseconds after leaving the friction zone. The results of the microstructural and structural analysis, as well as results obtained from diverse mathematical models, allowed us to evaluate several features, including gradual accumulation of defects, microstructural refinement, dislocation density changes, surface layer oxidation, as well as several other phenomena caused by the dry sliding friction process. Mainly, it was possible to conclude that the process of wear occurred due to the cooperative action of oxidation and plastic deformation, which began during the first cycle of frictional interaction and was manifested in increasing the dislocation density, whose type was changed gradually during testing. The number of defects quickly reached a threshold value and subsequently fluctuated around it due to periodically repeated processes of defect accumulation and stress relaxation resulting from material wear. It was also observed that friction led to the quick formation of a mechanically mixed layer, consisting of the sample material and a mixture of two types of iron oxide – hematite and magnetite. The delamination of this layer was probably the primary wear mechanism

ВОЗМОЖНОСТИ ВОССТАНОВИТЕЛЬНОГО ЛЕЧЕНИЯ ПАЦИЕНТОВ ОРТОПЕДИЧЕСКОГО ПРОФИЛЯ В УСЛОВИЯХ СОВРЕМЕННОГО РЕАБИЛИТАЦИОННОГО ЦЕНТРА

The rehabilitation of patients after surgery is an integral part of treatment in modern medicine. Restorative treatment is a complex of measures which includes participation of different medical specialists. The goal of child post-surgery rehabilitation is the restoration of physical and social adaptation of the patient. This article covers the main principles of restorative treatment in a multi-profile children’s medical institution. Examples of child rehailitation after reconstructive surgery of most frequent orthopedic pathologies are included.Реабилитация пациентов после оперативного лечения в современной медицине является неотъемлемой частью лечебного процесса. Восстановительное лечение — это комплекс мероприятий, включающий в себя участие врачей разных специальностей. Целью реабилитации детей в послеоперационном периоде является восстановление физической и социальной адаптации пациента. В статье изложены основные принципы восстановительного лечения в условиях многопрофильного детского медицинского учреждения. Приведены клинические примеры реабилитации детей после реконструктивных операций при наиболее распространенной ортопедической патологии.

Stabilization of Ti5Al11 at room temperature in ternary Ti-Al-Me (Me = Au, Pd, Mn, Pt) systems

Ti$_5$Al$_{11}$ is known as a high-temperature phase in binary Ti-Al alloys. However, its existence at low temperatures was previously observed in ternary Ti-Al-based systems alloyed with some transition metals. In this study, we systematically evaluated Ti-Al-Me ternary systems (Me = Au, Pd, Mn, or Pt) to determine the influence of transition elements on low-temperature stabilization of Ti$_5$Al$_{11}$ phase. The temperature ranges in which Ti$_5$Al$_{11}$ existed in Ti-Al-Me systems were experimentally found using in situ synchrotron X-ray diffraction (SXRD). It was established that addition of Mn and Pt retains Ti$_5$Al$_{11}$ at room temperature. The obtained data were compared with predictions of density functional theory (DFT). The total energy, volume, and bond length are especially significantly reduced by addition of Mn and Pt. Ti5Al11 compound containing both of these elements is less prone to saturation with Ti upon preserving the lattice tetragonality and suppressing Ti$_5$Al$_{11}$ → TiAl transformation. These factors finally contribute to the retention of this phase at room temperature