bluuebunny/crossref_metadata_2025 huggingface dataset:
Advanced training as a component of continuous education
Authors: Ovdii N.
Published: October 2024

The article examines the process of professional development as an important component of continuous education, especially in the context of modern Ukrainian research and publications. Analysis of modern research shows that Ukraine pays great attention to professional development. Ukrainian scientists emphasize the need to adapt educational programs to modern challenges, and online learning and distance courses are becoming important tools that ensure the accessibility of education. Examples of successful professional development programs include the activities of the National Academy of Pedagogical Sciences of Ukraine and Taras Shevchenko Kyiv National University. Government support plays an important role by providing financing and building the necessary infrastructure. These efforts contribute to the improvement of the quality of education and professional training of specialists, which improves the competitiveness of the Ukrainian economy at the global level.
A case Report of Membranous Dysmenorrhoea in Woman with Polycystic Ovary Syndrome
Authors:   Clinical hospital ", Grodnitskaya Е.E. ,   MD GROUP",   , Group of companies ",   Mother and child",   Moscow, Russian Federation,   Lomonosov Moscow State University Medical Institute; Moscow, Russian Federation, Karabanovich Ya.V. ,   Clinical hospital "MD GROUP", Group of companies "Mother and child"; Moscow, Russian Federation, Кurtser М.А. ,   N.I. Pirogov Russian National Research Medical University; Moscow, Russian Federation,   MD Medical Group "Mother and Child"; Moscow, Russian Federation
Published: October 2024

Aim. To present a case report of membranous dysmenorrhoea in woman with polycystic ovary syndrome. Key points. Membranous dysmenorrhea is defined as sudden sloughing of thickened endometrium as a whole with the shape of the uterine cavity. It’s more common in young females who were on either combined hormonal contraceptive or progestagen. Membranous dysmenorrhea is a rare gynecologic disorder with only a few documented cases. Because this entity is rarely mentioned in the medical literature, the purpose of this report is to describe such case. In presented clinical case report 30-year-old woman with polycystic ovary syndrome at the end of first cycle of treatment with combined oral contraceptive, containing ethynilestradiol and dienogest, developed acute cramping hypogastric pain followed by discharge a tissue from vagina. It's histopathological exam was performed with a clear diagnosis of membranous dysmenorrhoea. Conclusion. The medical knowledge, due to the lack of description of this entity in current textbooks, contributes to its underdiagnosis. More studies are needed to clarify the aetiology and the pathophysiology of this pathologic condition. Keywords: membranous dysmenorrhea, women, polycystic ovary syndrome.
The Short-term Effect of Caffeine Consumption on Reading Performance
Authors: Nazarudin Alia Natasha
Published: October 2024

Objective: Caffeine, a widely consumed psychoactive substance, is recognized for its cognitive-enhancing effects, notably enhancing performance on tasks requiring narrative comprehension, where it has been shown to boost both acuity and speed. This study investigates the impact of caffeine intake on reading acuity and evaluates changes in reading speed post-caffeine consumption. Material and Methods: Employing a cross-sectional design, nineteen participants with distance best-corrected vision of 6/6 or better (equivalent to logMAR 0.00 or better) (mean age=22.5±1.00 years old) and near vision of 0.1 logMAR (N5) were recruited. Baseline measurements of reading acuity and speed were taken using the article sourced from Perpustakaan Tun Abdul Razak (PTAR) and Buari-Chen Malay Reading Chart (BCMRC) before coffee consumption, respectively. Participants consumed 200 mg of Nescafe Gold (caffeine) before the subsequent assessment. The time taken to read the reading materials was recorded, alongside any errors. Results: While reading speed significantly increased post-caffeine consumption (t=-7.536, p-value<0.001), reading acuity remained unaffected (t=-0.378, p-value=0.705). These results suggest a moderate dose of 200 mg of caffeine can enhance reading speed without compromising acuity in young adults.Conclusion: This indicates that caffeine mainly affects the rate of reading, while it does not alter the reading acuity of individuals.
Relación de la Didáctica de la Expresión Plástica con la realidad del aula: percepción de los futuros docentes al cursar las prácticas profesionales en la escuela
Authors: Aparicio Flores María Pilar , Esteve Faubel Rosa Pilar , Chust Pérez Verónica , Esteve Faubel José María
Published: October 2024

Introducción: El Prácticum es un componente esencial en la formación profesional de los futuros docentes de Primaria. Sin embargo, existe una carencia de estudios que revisen la percepción de los universitarios sobre la relación de la formación universitaria en materia de Didáctica de la Expresión Plástica y la práctica en el aula. Metodología: El objetivo fue observar dicha percepción en 120 futuros maestros (entre 20 y 27 años), a través de un debate virtual. Resultados: El 89,38% percibe una coherencia de los conocimientos adquiridos en la Universidad, el 81,25% la considera útil, existe heterogeneidad sobre si perciben la Plástica como materia específica o metodológica, y valoran positivamente la formación artística en ambas aulas (57,14%), aunque con aspectos mejorables (42,86%). Discusión: La valoración positiva es por la base experiencial de la materia y los aspectos mejorables invitan a enriquecer de didáctica las prácticas. Conclusiones: Se debe investigar en Didáctica de la Expresión Plástica y diseñar guías de actuación para su implementación en la escuela.
Desarrollo de competencias comunicativas y digitales en entornos rurales, apoyados en el aprendizaje horizontal y uso de TIC
Authors: Ramírez Yesenia María , Aarón-Gonzalvez Marlin , León-Barros Cecilia , Solano-Barliza Andres
Published: October 2024

Introducción: Este trabajo explora la implementación de la horizontalidad en la enseñanza dentro de un contexto rural en una institución educativa donde los estudiantes de 7° grado enfrentan dificultades en su expresión oral y escrita. Se presenta una innovación pedagógica denominada “las profes con el uniforme”, que se desarrolla a través de una ruta pedagógica denominada “practiclases”. Este enfoque armoniza el aprendizaje activo con la participación del docente como compañero de clase, empleando una pedagogía que integra TIC. La metodología se basa en el modelo pedagógico constructivista, con el objetivo de fomentar el desarrollo del pensamiento crítico, la argumentación y la comunicación. Metodología: Para el desarrollo de la investigación se emplea metodología cualitativa desde la investigación acción participativa y la técnica de la observación directa. Resultados: Se construyó una ruta formativa apoyada en el método PIERR, que potencia la horizontalidad y permite el cambio de roles en el aula con el uso de TIC. Discusión: Esta experiencia favorece el fortalecimiento de las competencias discursivas, para que los estudiantes puedan desenvolverse en ámbitos académicos, personales y sociales. Conclusiones: Se capitalizó la mirada de los estudiantes hacia el docente en un ambiente de reciprocidad; la educación desde una pedagogía liberadora, la evaluación como valoración, el uso de TIC desde la alfabetización, la divulgación de sus aprendizajes y el desarrollo de clases.
Identidad profesional del educador social a partir de acciones formativas dialógicas con perspectiva intergeneracional
Authors: Reyes-Angona Sergio , Saban Vera Carmen , Sobrino Callejo Rosa
Published: October 2024

Introducción: Los datos de desempleo juvenil en España son especialmente graves en Educación Social, ampliándose la brecha entre la universidad y el desarrollo de la profesión. El objetivo de nuestro estudio es determinar el valor para la empleabilidad de un conversatorio realizado en una universidad española, una estrategia formativa basada en el diálogo intergeneracional de profesionales en activo, estudiantes, profesores e investigadores. Metodología: Se realizó un estudio exploratorio-etnográfico del evento, triangulando el análisis de los discursos orales de los participantes y la observación de su interacción. Resultados: El estudio, por una parte, caracteriza la identidad profesional actual del educador social, destacando el valor de sus habilidades blandas (aprender a aprender, colaborar y crear redes internacionales). Por otra parte, establece el alcance de esta pedagogía dialógica para la construcción social del conocimiento y el desarrollo de comunidad. Discusión: Este trabajo señala la necesidad de replantear la formación universitaria para fortalecer la transición entre el Grado y la profesión, desde una perspectiva humanista y de aprendizaje a lo largo de la vida. Conclusión: Este estudio define algunos elementos curriculares (habilidades blandas) y pedagógicos (educación dialógica) para diseñar programas de formación para la empleabilidad.
La evolución del metaverso y su influencia en la realidad digital: Una revisión y líneas de investigación futura
Authors: Delso Vicente Alberto Tomás , Almonacid Duran Margarita , García de Blanes Sebastián María
Published: October 2024

Introducción: Este estudio revisa los desarrollos significativos en el metaverso y su impacto en la realidad digital, enfocándose en los avances en tecnologías inmersivas, infraestructuras digitales y la integración de energías renovables. Metodología: Se realizó una revisión sistemática de la literatura utilizando las directrices PRISMA, centrada en artículos publicados entre 01 de enero de 2022 al 30 de junio de 2024. Se utilizó Web of Science, con términos de búsqueda como “metaverso”, y con el filtro de indexaciones SSCI. Resultados: La revisión destaca el papel crítico de las redes 5G, la computación en la nube y el edge computing en el soporte de aplicaciones de AR y VR, la integración de fuentes de energía renovable para mejorar la sostenibilidad y el uso de la ciencia de datos para optimizar las experiencias de usuario y los recursos energéticos. Discusión: Los hallazgos confirman la importancia de infraestructuras digitales robustas y revelan nuevas perspectivas sobre la rápida evolución y adopción más amplia de tecnologías inmersivas en diversos sectores. Conclusiones: Es esencial continuar invirtiendo en infraestructuras digitales y la integración de energías renovables. La investigación futura debe ampliar el periodo de estudio, diversificar los idiomas, incluir literatura gris, realizar estudios longitudinales y explorar el impacto de la integración energética y los desafíos de interoperabilidad.
The Effect of Testosterone on Serum Lipid Profiles, Glucose, Insulin and Leptin: A Experimental Study Based Animal Model
Authors: Akhtar Adere , Sohbatzadeh Tooba , Fazeli Ramina , Omrani Gholamhossein Ranjbar , Shojaei Melika
Published: October 2024

Background: Disruption in the endocrine system can cause many diseases. Based on this, the imbalance of sex hormones such as testosterone can change many serum factors. In this study, we examined the effect of testosterone on leptin levels, lipid profiles, and ultimately insulin resistance. Materials and Methods: Twenty one adult rats were divided into three groups of 7, including control group (C), olive oil group (O), and olive oil and testosterone group (OT). In the O and OT groups, they received olive oil and olive oil in combination with testosterone injection at the dose of 2 mg/kg/day, respectively. To evaluate the effects of hormonal imbalance on insulin resistance, various parameters such as leptin, triglyceride, cholesterol, glucose, and insulin were assessed. Results: The results showed that Triglyceride (TG) and insulin levels were higher in the OT group compared to the other two groups (P<0.05). In contrast, leptin and cholesterol levels were higher in group C compared to the other two groups (P<0.05) and glucose levels were higher in group O compared to the other two groups (P=0.01). Conclusion: In general, it can be said that testosterone can change serum lipid profiles, leptin, insulin, and glucose.
Impact of Grain Subsidy Policy on Agricultural Ecological Efficiency: Evidence from Pakistan
Authors: Ikhlaq Muhammad , Fatima Noor , Subhan Sabahat
Published: October 2024

The complex relationship between grain subsidy programs and agricultural ecological efficiency in Pakistan is becoming increasingly important in sustainable agriculture and environmental preservation. This study uses a quasi-experimental methodology. SPSS software was used to conduct the statistical analysis. Descriptive statistics were initially calculated for each variable. This study analyses grain subsidy policies using modern literature and empirical data, acknowledging government interventions' crucial significance in agricultural practices in Pakistan. The results show that, firstly, grain subsidy a siginfance positive relationship with ecological efficiency. Secondly the nagtive grain subsidy effect on soil health and soil pH(Avg.change). One consequence of such projects is boosting food production and supporting farmers economicallyThe study recommends legislative changes that balance agricultural productivity and environmental protection. These include promoting sustainable farming, reforming subsidy programs to encourage ecological practices, and incorporating environmental factors into agricultural legislation.
Influence of Teaching Strategies in Developing Critical Thinking Skills: A Review
Authors: Farooqi Muhammad Tahir Khan , Hasrat Mohsin Ali , Kanwal Sajida
Published: October 2024

This study aimed to review existing primary and secondary resources to make all stakeholders aware of the influence of different teaching strategies on fostering critical thinking in students. A specific criterion was set out by the researcher like the scope of the study, language, year of publication, nature of the journal, etc. The researcher searched out articles that duly fulfill the required criteria. After a review of those articles, findings explored multiple teaching strategies that may have a positive influence on students in making them critical thinkers. From this review, the most effective teaching strategies include the use of fairy tales, problem-based approach, collaborative learning, Socratic questioning, inquiry-based learning, and argument mapping, etc. The researcher suggested adopting multiple teaching strategies to enhance critical thinking skills in students.
What Went Wrong? A Critique on Pakistan’s War on Terror
Authors: Nazeer Sadia , Fatima Anbarin , Ghani Nayab Saqib
Published: October 2024

This paper explores the collective loss experienced by a family and a community of ‘Mir Ali’ in Fatima Bhutto’s The Shadow of the Crescent Moon (2013). By using Butler, 2003 and Moglen, 2005 theories of loss (personal and social), personal and collective mourning, and melancholia, the study reveals how people of Pakistan’s backward tribal area, Mir Ali, have suffered the trauma, loss, mourning and melancholy on personal and collective level during the ‘War on Terror’ by being alienated from their country. A detailed study of characters (Aman, Sammara, Mina, Hayat, and Sikandar) emphasizes how undermining it is to persons and families when they are tossed into rings of fire that expand and cause not only individual loss but irreparable communal or collective loss.
English Linguistics in the Nexus of Economic Growth and Cultural Evolution
Authors: - Sadaf , Naseer Muhammad Zeeshan , Sheraz Ahmad
Published: October 2024

This article investigates the profound role of English linguistics in shaping economic growth as well as cultural evolution in a world that is highly globalized. With the language ascending toward its status as a global lingua franca, it has greatly influenced international trade, labor mobility, and digital communication, thereby enhancing international economic integration. The economic benefits of knowing English include more competitive information technology and business process outsourcing industries in countries with higher proficiency levels, such as India and the Philippines. Also, there is the cultural dimension of advancing globalization that questions the internationalization of English, linguistic imperialism, and cultural homogenization. On the other hand, while several scholars have contended that the spread of English erodes linguistic diversity, others point out that English is also adaptive: local cultures combine English with native languages to create hybrid forms, including the renowned "Hinglish" and "Singlish."
Staged intervention to enable the resection of a large left temporoinsular cystic glioblastoma with language preservation: illustrative case
Authors: Donaldson Hayley , Golub Danielle , Placantonakis Dimitris G
Published: October 2024

BACKGROUND

Resection of glioblastoma (GBM) in eloquent regions depends on functional mapping to limit perioperative neurological morbidity. When neurological deficits preclude reliable mapping, neurosurgeons should explore potential mitigation strategies. The authors present the case of a patient with a large left cystic temporoinsular GBM and aphasia, for whom the authors used intraoperative language mapping and a staged approach to enable safe tumor resection.

OBSERVATIONS

A 49-year-old female presented with progressive mixed aphasia for 1 month and new-onset right facial droop. Magnetic resonance imaging (MRI) revealed a large, heterogeneously enhancing, left temporoinsular tumor with a significant cystic component. Her aphasia was profound, and resection without reliable language mapping was deemed unsafe. An initial stereotactic tumoral cyst aspiration was performed, which reduced local mass effect and improved her language function. Cyst decompression thereby enabled both task-based functional MRI and intraoperative awake speech mapping, resulting in a safe resection of her GBM.

LESSONS

Safe resection of eloquently localized GBM is compromised when neurological deficits prohibit intraoperative functional mapping. This case demonstrates a mitigation strategy specific to cystic lesions in which an initial-stage stereotactic cyst aspiration is aimed at generating sufficient interval neurological improvement, such that intraoperative functional mapping can be performed during a second-stage resection.

https://thejns.org/doi/10.3171/CASE24362
Multilevel thoracic myelopathy: full-endoscopic solution. Illustrative case
Authors: Sura Sukumar , Dave Harshit , Reddy Mallepally Abhinandan , Reddy Rajendra , Tulasi Ram H. C. V , Ravikanti Padma , Kumar Pagidimarry Naresh
Published: October 2024

BACKGROUND

Thoracic myelopathy is relatively uncommon but, when present, causes significant disability. Early surgical intervention is often recommended for patients with myelopathy with compression at multiple levels. Surgical approaches and techniques for thoracic myelopathy have evolved from traditional open spine surgery to less invasive full-endoscopic spine surgery.

OBSERVATIONS

This article reports an unusual presentation of a 31-year-old male with thoracic myelopathy due to thoracic disc herniation (TDH) at the T8–9 level and ossification of the ligamentum flavum at the T10–11 level that was managed using full-endoscopic spine surgery techniques in a single sitting. The presence of coexisting spinal disorders, that is, TDH and ossification of the posterior longitudinal ligament at noncontiguous spinal levels, makes surgical decision-making more complicated.

LESSONS

Uniportal full-endoscopic spine surgery is a safe and effective surgical technique even for thoracic myelopathy. It is less invasive with minimal tissue and bone damage, better access to and visualization of the pathology, and minimal cord handling and is performed through small windows without destabilizing the spine, thus avoiding fusion. Anterior thoracic pathologies are better addressed through the transforaminal approach, whereas the interlaminar approach is preferred for posterior pathologies. Both of these approaches are complementary to each other with their own indications and advantages.

https://thejns.org/doi/10.3171/CASE24413
Ожидаемая продолжительность здоровой жизни как компонент развития человеческого капитала
Authors: Кучмаева О.В. , Калмыкова Н.М. , Колотуша А.В.
Published: October 2024

Оценка качества жизни в регионе невозможна без учета общественного здоровья. В этих целях часто используется Индекс человеческого развития (ИЧР), который оценивает человеческий потенциал. Однако индекс ожидаемой продолжительности жизни при рождении (ОПЖ), входящий в состав ИЧР как индикатор долголетия, не учитывает состояния здоровья населения. Исследование доказывает возможность использования показателя ожидаемой продолжительности здоровой жизни (ОПЗЖ) в интегральной оценке качества жизни. Сравнительная оценка ситуации в регионах России в 2019–2020 гг. на основе предложенной методики, включая результаты дисперсионного анализа, показывает, что использование ОПЗЖ в качестве показателя здоровья более точно объясняет различия между регионами России по ИЧР. Различия в качестве жизни жителей регионов в основном определяются такими детерминантами здоровья, как доступность медицинских услуг, экологическая ситуация и условия труда. Доступность образования практически не влияет на различия в ИЧР между регионами. Полученные результаты подчеркивают необходимость сравнительного анализа Индекса ОПЗЖ и его использования в качестве показателя здоровья. Данные выборочных обследований в России позволяют уточнить методику ОПЗЖ и использовать характеристики ограничений по здоровью, что улучшит оценку состояния здоровья населения.

Assessment of quality of life in the region is impossible without taking into account public health. For this, Human Development Index (HDI) is often used, which evaluates human potential. However, index of life expectancy (LE), which is part of the HDI as an indicator of the longevity, does not take into account the health status of the population. The study proves the possibility of using the “indicator of healthy life expectancy” (HLE) in the integral assessment of life quality. Comparative assessment of the situation in the Russia’s regions in 2019–2020 based on the proposed methodology shows that the use of HLE as an indicator of health more accurately explains the differences between Russia’s regions in terms of HDI. Differences in the quality of life of residents of regions are mainly explained by determinants of health, such as the availability of medical services. The availability of education practically does not affect the differences in HDI between the regions. These results emphasize the need for a comparative analysis of HLE Index and its use as an indicator of health. The data of sample surveys in Russia allows us to clarify the methodology of HLE and use the characteristics of health restrictions, which will improve assessment of the population’s health status.
Формирование отечественных сетей добавленной стоимости
Authors: Полтерович В.М.
Published: October 2024

В статье вводится понятие СДС-консорциума, отличающегося двумя специфическими чертами. Во-первых, такой консорциум включает группу предприятий, осуществляющих последовательные стадии производства одного или нескольких продуктов. Во-вторых, в задачи СДС-консорциума входит разработка и реализация проектов создания и/или внедрения новых технологий, предназначенных для использования в его сети, в том числе предприятиями из разных отраслей народного хозяйства. Поэтому в его составе должны быть организации, способные выполнять такие задачи, возможно, с привлечением временных участников — научно-исследовательских и проектных институтов. Члены консорциума сохраняют свою самостоятельность. Согласование их деятельности осуществляется координационным советом, образованным из их представителей. На реальных примерах показано, что консорциумы подобного типа способны обеспечить формирование и функционирование отечественных сетей добавленной стоимости (СДС). Такие сети необходимы для технологического развития страны, находящейся под жестким санкционным давлением. Создание СДС-консорциумов могло бы стать важным элементом индикативного плана, а государственная поддержка способствовала бы становлению СДС-консорциума как коллаборативного института.

The concept of the VAN-consortium is introduced. It is a consortium, distinguished by two specific features. Firstly, it includes a group of enterprises that carry out successive stages of production of one or more products. Secondly, the tasks of a VAN-consortium include the development and implementation of projects for the creation and/or implementation of new technologies intended for use in its network, including by enterprises from various sectors of the national economy. Therefore, it should incorporate organizations capable of performing such tasks, possibly involving temporary participants – research and project institutes. Members of the consortium retain their independence. Coordination of their activities is carried out by a coordination council consisting of their representatives. Real examples show that consortia of this type are capable of ensuring the formation and functioning of domestic value-added networks (VANs). Such networks are necessary for the technological development of a country under severe sanctions pressure. The creation of VAN-consortia could become an important element of indicative plans, and government support would contribute to the development of the VAN-consortium as a collaborative institution.
Жіноче лідерство під час війни (за матеріалами публіцистики)
Authors: Савченко Світлана
Published: October 2024

Роль жінки під час війни дуже довго зводилася або до долі жертви, або до милосердної опікувачки поранених та знедолених. Лідерство у всіх пов’язаних з війною процесах вважалося прерогативою чоловіків. Проте стрімкі зміни у світі на межі ХІХ - ХХ ст. зумовили зрушення і у питанні жіночого лідерства. Разом з доступом до освіти, розширенням політичних прав, кращими можливостями працевлаштування, жіноцтво змінює свої позиції і в умовах війни. Українська публіцистика знайомить читачів з хоробрими учасницями Легіону Українських січових стрільців. Їхні біографії нині мотивують жінок, які служать чи підтримують Збройні сили України, чи проявляють свою активність у волонтерстві. Також завдяки публіцистиці широкому загалу стали відомі імена жінок, чиї героїчні вчинки були спрямовані на боротьбу з нацистами та порятунок цивільного населення у часи Другої світової війни. Важливо, що журналісти, письменники та оглядачі зважають на гендерний підхід у дослідженнях жіночого лідерства як у минулому, так і в умовах російсько-української війни, що триває. Завдяки авторським публікаціям військовослужбовиць та волонтерок, журналісток та активісток наші уявлення про жіноче лідерство в умовах війни суттєво розширюються.
Костел Успіння Пресвятої Діви Марії в Умані: особливості функціонування у 1967–2023 роках
Authors: Кузнець Тетяна , Присяжнюк Юлія
Published: October 2024

Костел Успіня Пресвятої Діви Марії в Умані має тривалу історію, але його джерельна база ще потребує доповнення. Метою статті є систематизація інформації про використання костелу після його реставрації до сьогодення, що сприятиме розумінню питання про можливості остаточного повернення його римо-католицькій громаді Умані. При підготовці статті автори дотримувалися принципів історизму, об’єктивності, плюралізму. Висновки: зібраний та систематизований у статті матеріал складає уявлення про особливість використання будівлі Успенського костелу у радянський час та добу відновлення незалежності України, що доповнює його історію та сприяє розумінню ситуації з поверненням його католикам Умані.
Options to Form a Transitional Government in Wartime in Sudan
Authors: Saeed Sami
Published: October 2024

This Report discusses the constitutional options that decision makers in Sudan can use as guidance in forming a government in conditions similar to what Sudan is going through. The Report discusses and analyses the essential forms of interim governments that can be applied in such situations of political and armed conflicts. It supports such options with the international practices of those models for interim governments. The Report concludes that it is not easy to form an interim government without political consensus and a ceasefire in times of war. An interim government can only succeed in providing services and facilitating the provision of humanitarian assistance if the warring forces adhere to the agreement concluded between them. Establishing any interim government during internal armed conflict requires strong and skilled civil society, trade unions, and experienced leaders to manage crises and lead society in such critical circumstances. The Report targets constitutional scholars, politicians, civil society and warring parties in Sudan to provide constitutional options for forming an interim government during wartime in Sudan after 15 April 2023.
Algorithm for calculation of wave numbers in a chiral metamaterial based on composite spiral elements
Authors: Dementiev Andrey N. , Kurkin Alexander N. , Smirnov Sergey V. , Arseniev Konstantin V. , Zhukov Aleksandr O.
Published: October 2024

Materials with various exotic electromagnetic characteristics have been extensively studied in recent decades to satisfy the growing interest in various fields, including visualization, telecommunications, energy use, and so on. As a particularly promising candidate, electromagnetic metamaterials exhibit electromagnetic properties that are inaccessible to natural materials. Due to the fact that the chiral medium (metamaterial) is a set of uniformly distributed conductive mirror-asymmetric (chiral) elements in an isotropic dielectric medium. In addition to the material from which the chiral element is made, its shape also plays an important role. That is why it is so important to study new types of chiral elements, as well as to determine the electrodynamic properties of chiral metamaterials based on them. The paper considers the solution of the problem of determining the reflection and transmission coefficients when a plane electromagnetic wave falls on a planar layer of a chiral metamaterial based on multi-pass conducting elements of the spiral type, taking into account the structural parameters of the metamaterial, which is a matrix of thin-wire ideally conducting elements in the form of N mutually orthogonal spirals. To determine the parameters of a chiral metamaterial based on composite spiral elements, the construction of a particular mathematical model of a composite element based on an arbitrary number of spiral elements in a spatial configuration, as well as a metamaterial based on a matrix of such elements, is considered. An algorithm for calculating the propagation constants of waves with circular polarizations in the specified metamaterial is proposed. From the calculations presented, it can be noted that the metastructure under study at one frequency can act as a frequency-selective protective shield that is not transparent to radiation near the main resonant frequency.
Solution of the integral equation for the average cost of restoration in the theory of reliability of technical systems
Authors: Vainshtein Vitaly I. , Vainshtein Isaak I. , Safonov Konstantin V.
Published: October 2024

Failures of elements during the operation of technical and many other systems are, as a rule, random in nature. This leads to various models of the recovery process, studied in probability theory and mathematical reliability theory. During the restoration process, failed elements are restored or replaced with new ones, and there is often a change in the costs and quality of the restored elements (time-to-failure distribution functions).
The work examines the cost function (average cost of restoration) in the process of restoration of order k1,k2,in which, according to a certain rule, the costs of each restoration and the distribution functions of operating time change.
Considering, that the recovery function (average number of failures) is well studied in reliability theory, a solution to the integral equation for the cost function is obtained through the recovery function of the model under consideration.
For the order restoration process k1,k2,a formula is obtained for calculating the cost function through the restoration function of a simple process formed by the convolution of all distribution functions of the periodic part. For practical application, explicit formulas are obtained for the cost function during the restoration process, in which the periodic part is distributed according to an exponential law oran Erlang law of order with the same exponent α.
The resulting formulas can be used to study the properties of the cost function and solve optimization problems in strategies for carrying out the restoration process in terms of price, quality, risk, if, for example, the average number of failures is taken as quality, the average cost of restorations as price, the dispersion of the number of failures as the risk, or cost of restoration.
Characteristics research of a low thrust rocket engine manufactured using additive SLM technology
Authors: Akbulatov Edkham Sh. , Nazarov Vladimir P. , Gerasimov Evgeny V.
Published: October 2024

The development and improvement of rocket and space technology are largely determined by the application of manufacturing technologies that enable the production of high-reliability products with energy efficiency, while simultaneously reducing material intensity and shortening the production cycle. Among these progressive technologies, additive technologies should be mentioned. The essence of these technologies lies in obtaining parts through layer-by-layer melting of material based on a computer 3D model of the product in a chamber of a specialized 3D printer equipped with a laser device.
The application of additive technologies in rocket engine construction requires extensive scientific research and experimental work to confirm compliance with industry standards, rules, and mandatory certification at the state level. In accordance with the program of priority research at SibSU, in collaboration with the industrial partner “Polychrome” LLC a complex of experimental work is being carried out to test and refine the 3D printing modes of a demonstrator model of a low thrust rocket engine (LTRE).
The design of the LTRE, operating on environmentally friendly gaseous fuel components, has been developed and adapted for 3D printing on the ASTRA 420 printer. The parameters and characteristics of the printer are considered, and the sequence of experimental work on selecting printing modes for the engine chamber housing and mixing head is outlined. The fundamental possibility of adjusting the modes of laser material melting and forming of the part has been established.
The main technological stages of post-printing processing of LTRE chamber parts are presented. A description of the equipment for heat treatment and electrochemical polishing of parts is provided. The sequence of material structure research is outlined, and the results of metallographic and X-ray analysis of the internal state of the metal are presented.
The importance of stand tests of rocket engines in the development of innovative design solutions and the implementation of innovative production technologies is demonstrated. A description and composition of the testing stand system at SibSU are presented. The results of stand firing tests indicate the fundamental possibility of manufacturing LTRE using selective laser melting of heat-resistant alloy.
Plasma antenna with frequency adjustment
Authors: Minaev I. M. , Tikhonevich O. V. , Vekshin Yu. E.
Published: October 2024

A discharge of limited length (“plasma column”) in a gas-discharge tube filled with a rarefied gas was studied. The discharge is created due to the one-sided excitation of an extended high-frequency discharge supported by a propagating azimuthally symmetric mode of the surface wave. It is shown that a “plasma column” can be an effective plasma antenna at operating frequencies below the plasma frequency (ωp), with frequency tuning due to changes in the length of the “plasma column”.
Investigation of optical fiber line with a positive transmission ratio of analog microwave signal
Authors: Tatsenko I. Yu. , Ustinov A. B.
Published: October 2024

The influence of optical radiation power on the one-decibel compression point, harmonic distortion and dynamic range due to interference in a fiber-optic transmission line of an ultra-high frequency (microwave) signal has been studied. The line had a positive microwave signal transmission coefficient, and there were no amplification elements between the input and output. The amplification effect was achieved through the use of increased power of the carrier optical radiation and a photodetector with a high photocurrent. It has been shown that an increase in optical radiation power leads to a decrease in one-dB compression power and an increase in harmonic distortion, but an increase in optical radiation power does not lead to a change in the dynamic range of interference. It was found that the dynamic range free from interference was about 85…87 dB.
Scientific terms as a part of comparative tropes of modern Russian prose
Authors: Nikolina Natalya A. , Petrova Zoya Yu. , Fateeva Natalia A.
Published: October 2024

Modern Russian prose is characterized by the active use of scientific terms from different fields of knowledge, which act as images of comparison for comparative tropes. Such tropes are marked by stylistic emphasis, as they contain new information for the addressee. Comparative tropes are defined as metaphors and similes of various structural types. The purpose of our work is to analyze the use of scientific terms as images of comparison for comparative constructions and determine their functions in the texts of modern Russian prose. The material for the study is the works of E. Vodolazkin, A. Ivanov, A. Ilichevsky, A. Matveeva, V. Pelevin, D. Rubina, A. Salnikova, O. Slavnikova, M. Stepnova, O. Vasyakina and others. The article discusses terms in tropes representing different fields of science: physics, chemistry, mathematics, medicine, biology, physiology, linguistics, literary criticism, art history, and computer science. The most active in the comparative tropes of modern prose are biological, medical, physical and computer terms. The productivity of these terms is associated with the rapid development of these areas of knowledge and their role in modern society. Regarding parts of speech, most of them are substantives. By metaphorizing, terms are subject to determinologization. In prose texts, terms often have distributors that clarify, specify or modify the image of comparison. In modern prose, scientific terms as part of tropes perform a number of functions: the function of figurative characteristics of a person, object or phenomenon, the evaluative function, the text-forming and conceptualizing functions. Scientific terms as part of metaphors and similes replenish and update the literature language.
The influence of climatic and anthropogenic factors on the productivity of forest stands in the ecotone of the northern treeline on the Yamal peninsula
Authors: Devi N. М. , Bessonova V. А. , Kukarskih V. V. , Hantemirov R. М.
Published: October 2024

On 12 sample plots established in the ecotone of the northern forest boundary in the Khadyta-Yakha River valley on the Yamal Peninsula, time of emergence and death, as well as productivity of about 1000 Siberian larch (Larix sibirica Ledeb.) and Siberian spruce (Picea obovata Ledeb.) trees were analyzed. Over the last 140 years, there has been a sharp increase in the stocks and annual growth of stem phytomass of woody plants within the studied ecotone. Since the 1970s, the average annual growth of phytomass has been increased by 1.2–39 times, which was facilitated by a 0.9оC increase in average June–July air temperature. However, this effect is insignificant in areas of mixed open forests subjected to periodic logging.
Condensates of magnetoexcitations in quantum Hall dielectrics
Authors: Gorbunov A. V. , Larionov A. V. , Kulik L. V. , Timofeev V. B.
Published: October 2024

The formation and spreading in real space of dense ensembles of photoexcitations in integer and fractional quantum Hall dielectrics with filling factors ν = 2 and ν = 1/3 is visualized using a high-aperture high-resolution optical system. A comparative analysis of the correlation between the transport properties and the spatial coherence of these ensembles is carried out.
Studying the optical properties of assembled silver and gold nanoparticles for the purpose of creating SERS sensors
Authors: Subekin A. Yu. , Pylaev T. E. , Kukushkin V. I. , Rudakova E. V. , Khlebtsov B. N.
Published: October 2024

The optical properties of silver and gold sols with different sizes of nanoparticles and the method of their chemical deposition on the surface of silicon, silicon oxide, glass and aluminum foil were studied in order to obtain SERS substrates – promising platforms for the development of aptamer sensors and immunochemical analysis of various pathogens. It has been established that for operation on lasers with exciting radiation wavelengths of 532, 638 and 785 nm, it is possible to create universal SERS substrates based on colloidal solutions obtained by the liquid-phase chemical method with an average silver particle size of 40 nm and by the Leopold-Lendl method with an average size of 20 nm.
Precision computation of one-dimensional quadratures
Authors: Khokhlachev V. S. , Tintul M. A. , Belov A. A.
Published: October 2024

The calculation of quadratures arises in many physical and technical applications. In this paper, the best quadrature formulas are selected and their quantitative comparison is carried out on a number of representative examples.
Transport of non-equilibrium quasiparticle excitations in superconducting aluminum
Authors: Gursky A. S. , Shapovalov D. L. , Arutyunov K. Yu.
Published: October 2024

The electron transport of non-equilibrium quasiparticles injected into superconducting aluminum from a normal metal has been experimentally studied at ultralow temperatures. We studied hybrid nanostructures in the form of a T-shaped normal metal electrode (copper) – a dielectric tunnel layer (aluminum oxide) – a superconducting fork (aluminum), which can be considered as a solid-state analogues of a two-beam optical interferometer. At fixed bias voltages larger than the superconducting gap, a non-monotonic dependence of the tunnel current on perpendicular magnetic field is observed. The effect is interpreted as the presence of a coherent component of the quasiparticle current.
Peculiarities of Organising Events under Martial Law Conditions
Authors: Haidukevych Kateryna
Published: October 2024

The aim of the article is to analyse the social purpose and to ground peculiarities of organising events under martial law conditions. Results. To achieve the goal of the scientific research, the comparative and systematic methods are used. They allowed to identify and substantiate the specifics of organising events in Ukraine after the Russian full-scale invasion, as well as to outline main directions of functioning and prospects for the development of events in the post-war time. The events are viewed as a symbolic capital of culture, its social marker, a universal means of realising the culture creating potential of the public, which stimulates the study of organisational features of events under martial law conditions. The article traces the relationship between social tendencies and event formats during the Russian aggression; specifies the problems that accompany the process of organising events since the beginning of the full-scale invasion; grounds their content and thematic direction; outlines the directions of functioning of events in the post-war time. Scientific novelty. It is proved that events held in Ukraine during the martial law go through a few stages of functioning: the stage of stagnation and re-profiling, which is inherent to event agencies in the first months of the war; the stage of a peculiar revival, which begins in the summer of 2022 and lasts until the end of 2023; the stage of adaptation and recovery, which begins in early 2024 and continues to nowadays. These periods differ in terms of event formats, target audience, and functional focus. Conclusions. It is proved that the specifics of event organisation under martial law conditions are relevant goals and objectives of a certain event; theming and structure of the event, innovative approaches to the format of the event and the way of its implementation. Such a vision is substantiated that in the post-war years the Ukrainian event industry will be characterised by a symbiosis of international, Ukrainian and local tendencies in the development of the event industry with an emphasis on the cultural ecosystem and public activity
Cultural Practices as a Tool for the Tourist Destination Development
Authors: Kopiievska Olha
Published: October 2024

The aim of the article is to analyse the functional peculiarities of cultural practices under the conditions of transforming tourist destinations in Ukraine. Results. On the basis of the conducted analysis, it is proved that the preservation of the uniqueness and attractiveness of tourist destinations depend on effective management and strategic priorities. It allows preserving the integrity of the cultural and tourist space with qualitatively new and attractive cultural practices. It is revealed that the tourist destination formation is one of the main tasks in the system of cultural policy development of modern states. The study analyses the role of tourist destinations as custodians of cultural heritage at all levels, such as global, glocal and local. It is established that such destinations form a unique cultural space for the entire country. They act as cultural receptacles and centres of cultural life that attract both local residents and tourists from other countries. It is noted that the symbiosis of cultural and tourist practices allows to form a national image with its unique cultural potential. The scientific novelty of the study consists in the theoretical understanding and determining the practical role and significance of cultural practices in the process of transforming tourist destinations. Conclusions. Ukrainian reality and world practices testify to active cultural transformations of tourist destinations. As custodians of cultural heritage, tourist destinations form the cultural space of the entire country. They are a concentration of cultures, a centre of cultural life of the state’s citizens, and a centre of tourism for representatives of other countries. An important tool for the qualitative transformation of the tourist destination functionality are cultural practices that are able to provide emotional recovery, establish rational communication and dialogue between all participants in the cultural process. As a cultural practice, intercultural dialogue is the most important value in solving the global problems of nowadays. The formation and development of a cultural landscape with unique cultural practices are the most important factors for preserving and restoring tourist destinations together with their values, which depend on national identity.