bluuebunny/crossref_metadata_2025 huggingface dataset:
On the (Im)possible Relation Between the Universal and the Relative: The Aporia of Community
Authors: de Silva-Wijeyeratne Roshan
Published: September 2024

‘British values’ have recently been invoked by the Right in Britain – both in the Conservative Party and outside by the Reform Party led by the Right insurgent and public school educated (Dulwich College) ‘man of the people’ Nigel Farage. Such values are directed at communities of colour, as well as those communities that stand apart from the logic of ‘phallologentricism’. Factions of the secular Left too have engaged in an iteration of ‘culture wars’ by targeting Jewish communities who may not share Hamas’s desire to eradicate Israel in favour of a monistic Palestinian State. At the heart of these contested cultural terrains is an overarching issue: namely, the question of the universal, and how the universal informs the States’ politics of representation (the “General Will”, the “nation”, “citizen” etc…). Derrida reminds us that “the social” – let alone the State and the polity it brings to life – can never be reduced to a single meaning, that the nature of community will always be subject to contestation contra the telos of monism.
Violent México: The War on Drugs, the Persistence of Oligarchies, and Gender Issues
Authors: Dorcé André , Miller Toby
Published: September 2024

México is powerfully associated with extreme violence. We explore why this should be in terms of the war on drugs, colonialism, oligarchic history, neoliberalism, and gender.
Silent De-Sovietization and Urban Renewal in Dushanbe
Authors: Kluczewska Karolina
Published: September 2024

In the past decade, large-scale urban reconstruction has been ongoing in Dushanbe, Tajikistan’s capital city. In this process, the city’s Soviet architecture is being demolished and replaced by Dubai-inspired high-rises. This transformation of public space is a manifestation of the process of silent de-Sovietization that has taken place in Tajikistan. Unlike what has been seen in other post-Soviet countries, this form of de-Sovietization does not result from rethinking the country’s Soviet past and deliberately departing from it. Rather, it is a casual by-product of Tajikistan’s capitalist transformation.
War in Nagorno-Karabakh Shakes Armenian-Turkish Relations
Authors: Papazian Hrag
Published: September 2024

Turkish support for Azerbaijan in the 2020 Nagorno-Karabakh war has renewed long-dormant Armenian perceptions of a neighboring threat. Turkey provided direct military support that helped its ally reconquer the ethnic Armenian exclave, leading to the forced exodus of most inhabitants after a final defeat in 2023. Continuing open hostilities stalled efforts to normalize Armenian–Turkish relations and reopen the border following the 2020 war. For Armenians both in Armenia and in the diaspora, including those living in Turkey, the war prompted comparisons to the 1915 Armenian Genocide and perceptions that a historical enemy was once again actively aggressive in a region that had long been considered part of Moscow’s sphere of influence.
Qualitative expert assessment of the condition of a patient's ocular fundus in severe and advanced stages of proliferative diabetic retinopathy
Authors: Teshev Adam F. , Malyshev Alexey V.
Published: September 2024

Objective: comparative qualitative expert assessment of the condition of the patient's fundus in severe and advanced stages of proliferative diabetic retinopathy (PDR). Material and methods. An assessment was made of the developed qualitative criteria for the condition of the fundus in patients with the following stages of PDR: severe-high risk 1 (SHRPDR-1, 32 eyes), severe-high risk 2 (SHRPDR-2, 32 eyes) and advanced (APDR, 34 eyes). The developed criteria (preretinal hemorrhage, fibrosis of the posterior hyaloid membrane, vitreous hemorrhage, etc.) were assessed by one ophthalmic surgeon on a point scale: 1 point — initial changes; 2 — weak, but more pronounced (compared to 1 point) changes; 3 — severity of moderate changes; 4 — pronounced changes. Results. The greatest increase in the average score in the group of patients with APDR (compared with SHRPDR-1 and SHRPDR-2) was established according to the following criteria: fibrovascular tissue in the area of the optic nerve head and along the vascular arcades (2 times), fibrosis of the posterior hyaloid membrane (1.5 times), vitreous hemorrhage (1.4 times); for other criteria, the increase in average score varies from 28 to 93%. At the same time, there is only a tendency for the criteria to worsen between SHRPDR-1 and SHRPDR-2 (p>0.05). Conclusion. A significant deterioration of all criteria was established in patients with APDR compared with SHRPDR-1 and SHRPDR-2.
Clinical features of post-COVID syndrome in patients with carbohydrate metabolism disorders
Authors: Savchuk Ksenia S.
Published: September 2024

Objective: clinical characteristics of patients with carbohydrate metabolism disorders (CDM) in the post-COVID period. Material and methods. 72 people with CDM in the post-COVID period were examined. Results. When detailing complaints, the incidence of respiratory symptoms in patients with impaired glucose tolerance (IGT) and diabetes mellitus (DM) was comparable. In both groups, nonspecific (general weakness) and neurological (memory deterioration, sleep disturbances, decreased vital activity) symptoms predominated. The development of NUD in the post-COVID period was facilitated by such risk factors as age >45 years, body mass index >25 kg/m2, family history of type 2 diabetes, hypertension. The most common concomitant diseases were overweight and obesity — in 64 (88.9%) patients, dyslipidemia — in 44 (61.1%), hypertension — in 32 (44.4%). In the group of patients with IGT, the frequency of re-infection with SARS-CoV-2 was higher compared to the group of patients with diabetes, and there was a tendency for the course to become more severe with re-infection. Conclusion. In the post-COVID period, patients with IGT and diabetes are more likely to have nonspecific and neurological complaints, while identified NDEs can aggravate the course of concomitant diseases and lead to re-infection with SARS-CoV-2.
Difficulties in diagnosing the erased course of late neurosyphilis (clinical case)
Authors: Karakulova Yulia V. , Salakaeva Anna S.
Published: September 2024

In the article is presented clinical case of a patient with late parenchymal neurosyphilis in the form of progressive paralysis. The basis of the clinical manifestations of the disease in the patient was progressive cognitive impairment. The described case demonstrates clinical similarities with chronic cerebral circulatory disorders, multiple sclerosis, neurodegenerative and mental diseases, shows the need to remain vigilant of neurologists and therapists regarding rare but curable diseases of the nervous system due to their polymorphic clinical picture and erased course.
Influence of cardiovascular risk factors on the health of rural population in Russia (review)
Authors: Bogdanova Tatyana M.
Published: September 2024

Objective: to assess the influence of medical and social risk factors for cardiovascular diseases on outcomes of patients living in rural and remote areas of the Russian Federation. Review writing methodology. A systematic review was carried out according to the PRISMA (The Preferred Reporting Items for Systematic reviews and Meta-Analyses) methodology using eLibrary, Google Scholar, and CyberLeninka databases. Search depth — from 2002 to 2022. The review included 19 original studies. It has been established that the prevalence of cardiovascular diseases risk factors in the rural population is not always higher than in the urban population, and the outcomes are worse. Conclusion. It has been shown that among the rural population, social determinants of health come to the fore, determining the ability of patients to follow recommendations for managing risk factors and receive timely and high-quality medical care.
Experience in implementing a corporate program for prevention of dental health among working population
Authors: Kazantsev Mikhail V. , Isaeva Natalia V. , Bagautdinova Irina V.
Published: September 2024

Objective: to evaluate the effectiveness of the corporate program for the prevention of dental health among employees of an industrial enterprise. Material and methods. The program included 2 stages: informational (round tables, brochure) and dental (dental consultation). The participants are employees of one workshop of an industrial enterprise. 150 (50% men, average age 38.5±0.8 years) took part in the information stage, 20 employees (45% men, average age 41.1±2.8 years) took part in the dental stage. The effectiveness of the program was assessed by awareness, the CFE index, and the Green — Vermillion hygiene index. Results. The awareness of employees about the causes of hypersensitivity of teeth and the rules for cleaning them increased by 1.3 times, the need to use specialized toothpastes by 2.1 times, the use of mouthwashes and a change in nutrition by 14.3 times. Awareness of doctors providing care for increased tooth abrasion has increased: dental therapists 1.3 times, orthopedic dentists 3 times, general practitioners 3.7 times and periodontists 10.4 times. The differences are significant (p=0.001-0.041). The CFE index has not changed. The Green — Vermillion index decreased from 1.9±0.2 (from a score of "unsatisfactory") to 0.5 (p<0.001), which corresponds to a good level of oral hygiene. Conclusion. The introduction of a corporate program to strengthen dental health at an industrial enterprise has led to increased awareness among employees about the causes and methods of preventing increased tooth abrasion, and improving the level of oral hygiene.
Analysis of sex and age characteristics and narcological past history of persons applying to public organizations for social rehabilitation
Authors: Tsarev Sergey A. , Berezovsky Alexander Yu.
Published: September 2024

Objective: To improve the motivation of drug users to undergo social rehabilitation, to analyze the main sex and age characteristics, as well as data on the drug history of persons undergoing social rehabilitation in the Samara regional charitable public organization "Rehabilitation of drug addicts (Remar)". Material and methods. Anonymously, 173 rehabilitants were surveyed according to a developed questionnaire of 15 questions related to gender, age and drug history of rehabilitants. Results. Social rehabilitation services are more often used by men (75.7%), the average age of rehabilitants in the study was 37,3±0,9 years; 51.4% of rehabilitants use opiates, 36.4% — psychostimulants, 24.8% — alcohol. 35.8% of rehabilitants previously applied for treatment to state medical organizations, while 19.2% of respondents were not satisfied with the quality of the service provided, 25.8% were available. Conclusion. Patients of the Samara regional charitable public organization "Rehabilitation of drug addicts (Remar)" are more often men living mainly in cities who consume psychoactive substances for a long time, mainly opiates, psychostimulants and alcohol. The sex and age characteristics of rehabilitants identified during the study, as well as the data of their narcological history, will allow adjusting the ongoing motivational work on the involvement of users of psychoactive substances in the process of social rehabilitation.
Scientific and practical contribution of Ksenia A. Koshkina to the development of the museum of the department of human anatomy at V.I. Razumovsky Saratov State Medical University
Authors: Gladilin Yuriy A. , Fomkina Olga A. , Muzurova Ludmila V. , Popkov Vladimir M.
Published: September 2024

The article is dedicated to the Doctor of Medical Sciences, Associate Professor of the Department of Human Anatomy Koshkina Ksenia Alekseevna (1899-1945). The work describes the main stages of her scientific biography, as well as the history of the creation under her leadership and the direct participation of unique anatomical preparations "the corpse of an adult man with reconstituted vessels and nerves of the whole body" and "the corpse of an adult man with reconstituted muscles of the whole body". For 85 years, these drugs have been the central exhibits of the fundamental educational and anatomical museum of the Department of Human Anatomy of Saratov State Medical University named after V. I. Razumovsky.
Redesign of Primordial Museum and Archaeological Research Center in Cipari Archaeological Site Area, Kuningan Regency with Biophilic Architecture Approach
Authors: Nadyan Tifanika , Putra Bambang Setyohadi Kuswarna , Wibowo Ardiyan Adhi , Santoso Eko Budi
Published: September 2024

Indonesia is a paradise for archaeological research, proven by the many kinds of Pleistocene era artifact findings scattered throughout the country, including in Kuningan Regency. One of them is the finding of a megalithic site in Cipari Village, which is the only megalithic heritage archaeological site given more attention by the Kuningan Regency municipal government, with the establishment of the Cipari Archaeological Park Museum in 1976. Ironically, the archaeological museum building at Cipari Site is still relatively simple, and has not been able to follow the guidelines for establishing a museum. The existing building, which has an area of 80m², only contains temporary exhibition rooms, toilets and management rooms which are deemed unable to accommodate groups of tourists who often come from various educational institutions. So, a redesign is needed that is able to house a collection of artifacts as well as an archaeological research center to facilitate archaeologists and scientists, in researching artifacts that have been found in Kuningan and its surroundings. The primordial museum and archaeological research center is a building that stores and researches natural objects of ancient relics found in nature, so it is good if this building can be redesigned by considering its relationship with nature. Therefore, the biophilic architecture approach is deemed appropriate in the redesign of the museum building along with the archaeological research center or in other languages, the Primordial Museum and Archaeological Research Center in the Cipari Archaeology Site Area, Kuningan Regency. Data is also needed which includes primary and secondary data needs and then analyzed with five aspects of the approach, including functional, contextual, technical, performance and architectural aspects. The results will produce design recommendations for the Primordial Museum and Archaeological Research Center in the Cipari Antiquities Area, Kuningan Regency, West Java.
Ekonomik büyüme ve enerji yoksulluğu arasındaki ilişki: D-8 ülkelerinden bulgular
Authors: Çelik Hüseyin , Polat Mehmet Ali
Published: September 2024

Energy is critical in production and daily activities in all economies today. Although energy is usually required for economic growth in developed economies, it is also fundamental to economic growth and growth in less developed and developing economies. In this context, this study aims to investigate the linkage between energy access and economic growth in D-8 nations. Inflation, health expenditures, and income were included in the model as control variables. The data set covers the period from 1990 to 2021 and is annual in frequency. The methodology employed includes PANIC and CIPS unit root and Durbin-Hausman co-integration tests. A co-integration relationship was found in the model, and AMG (Augmented Mean Group) was used to perform long-run coefficient estimates. After the coefficient estimation results, we found no statistically significant relationship between energy poverty and economic growth. The energy factor should be used more effectively in poverty reduction. In particular, expanding renewable energy sources will also contribute positively to sustainable growth.
Guardians of health: School nurses and their leadership roles in the fight against the COVID-19 pandemic in education
Authors: Sayar Burak , Dindar Emine Kübra , Özyılmaz Cihat
Published: September 2024

This study investigated school health nurses’ critical role and importance in managing infectious diseases during the COVID-19 pandemic. The pandemic has had negative impacts on schools and educational institutions. In light of these impacts, the assistance of school health nurses in overcoming difficulties in accessing health services for students and their families was examined globally. The study aimed to explore the status of school nursing practices in various countries in response to the challenges posed by the COVID-19 pandemic, assess the situation in Turkey, and examine how these nurses contribute to health management in educational settings. To identify pertinent literature, relevant publications were reviewed using key terms such as ‘school nursing,’ ‘infectious disease management,’ ‘COVID-19,’ ‘safe school,’ and ‘public health’. The search focused on studies analysing the role of school health nurses during the pandemic. Sources included academic databases, public health reports, and public health organisation publications. Due to the lack of precise data on the employment of school health nurses in Turkey, specific information on their role during the pandemic could not be found. However, the relevant literature was comprehensively reviewed, and the study analysed global publications highlighting the critical role of school nurses in managing infectious diseases in educational settings. The study highlights that school health nurses play significant roles in preventing and controlling communicable diseases and contribute notably to health education for students and staff during the pandemic. School health nurses protect children and adolescents’ physical, psychological, and spiritual well-being. Findings suggest that structural changes in health and education systems are needed to enhance the effectiveness of school nurses. This study underscores the critical importance of school health nurses in pandemic management and public health protection. Strengthening their role is vital for preventing the spread of infectious diseases in schools and ensuring the well-being of students. Recommendations include increasing the employment of school health nurses, improving their professional development, and integrating their expertise into pandemic management strategies.
Uncovering airline service quality dimensions from passengers' online reviews: A text mining approach to validate and extend Servqual
Authors: Kılıç Sena , Enginkaya Ebru
Published: September 2024

This study investigates airline service quality dimensions by employing text-mining techniques to analyse passengers' emotional responses and experiences with airlines as reflected in their online reviews. The study aims to identify the relationship between these and SERVQUAL dimensions to confirm its reliability in the airline industry and reveal new and promising dimensions of airline service quality. The study contributes to academia by enriching literature on airline service quality and text mining applications, identifying areas for enhancement, and suggesting strategic directions for continuous improvement to practitioners based on passengers' quality perceptions of airline service experiences. With a large dataset from 100 airlines obtained from Skytrax, the study offers a deeper understanding of airline service quality. It encourages using big data and text-mining techniques to explore consumer preferences. The study's findings challenge traditional models and bring out new, context-specific service quality characteristics to provide a greater understanding of passenger experiences. These give the airlines insightful guidance on improving service offerings and fulfilling customer expectations, eventually improving customer satisfaction, loyalty, and competitive positioning.
İşe bağlı duygusal tükenmişliğin sessiz istifa üzerine etkisinde çalışma yaşam kalitesinin aracılık rolü: Sağlık çalışanlarında bir araştırma
Authors: Gökkaya Durmuş
Published: September 2024

This study aims to determine the mediating role of quality of work life in the effect of work-related emotional burnout on quitting in healthcare workers and whether there is a significant difference with demographic variables. SPSS 26 package programme Process Macro (Model 4) was used to evaluate the data. It was determined that the scale variables were normally distributed. Descriptive statistics, independent sample t-test, one-way analysis of variance and Pearson correlation analysis were used to determine the relationships between the scales. Process Macro (Model 4) was used for mediation analysis. The study was conducted in a university hospital with the participation of 260 health workers. According to the findings, work-related emotional burnout and quiet quitting were found to be moderate, and quality of work life was found to be high. There was a significant difference between age and work-related emotional burnout and quality of work life. The direct (β= 0.380) and indirect (β= 0.152) effects of job-related emotional burnout on quiet quitting are statistically significant. As a result, it can be said that age is an essential determinant of work-related emotional burnout and quality of work life. It is concluded that quality of work life mediates the effect of work-related emotional burnout on quitting. It is recommended that work-related emotional burnout and quiet quitting should be reduced, and healthcare workers' quality of work life should be increased.
ON THE POSSIBILITY OF COMPLETE SUPPRESSION OF THE DISTORTING CONTRIBUTION OF THE MEASUREMENT ERROR DUE TO INACCURACY OF DIFFRACTION GRATING MANUFACTURING
Authors: КИРЬЯНОВ В.П. , КИРЬЯНОВ А.В.
Published: September 2024

Показана возможность полного подавления инструментальной погрешности, обусловленной неточностью изготовления углоизмерительной структуры, которая реализуется при произвольной форме поля взаимодействия светового излучения с топологией измерительной структуры. Данная возможность достигается выбором необходимой структуры преобразователя, для которой обеспечивается принцип когерентности комплементарных гребенчатых фильтров, формируемых в преобразователе.

The possibility of complete suppression of the instrumental error caused by inaccuracy of manufacturing of an angle-measuring structure, realized at an arbitrary form of the field of interaction of light radiation with the topology of the measuring structure is shown. This possibility is achieved by choosing a necessary structure of the encoder for which the principle of coherence of the complementary comb filters formed in the encoder is provided.
OPTICAL STRAIN GAUGE IN THE WHEEL-RAIL INTERACTION PROBLEM
Authors: ФЕДОРИНИН В.Н. , БЕХЕР С.А. , ВЫПЛАВЕНЬ В.С. , СИДОРОВ В.И. , БАЙБАКОВ А.Н. , ПЛОТНИКОВ С.В.
Published: September 2024

Представлены результаты экспериментальных исследований деформации рельса, находящегося под силовым воздействием движущегося железнодорожного транспорта. Исследования выполнены с применением высокочувствительного датчика деформации с предельным уровнем относительной деформации 2 · 10-7. Анализируются возможности оптической тензометрии для решения задачи мониторинга технического состояния ходовых частей вагонов и верхнего строения пути.

The results of experimental studies of the deformation of a rail under the force of a moving railway transport are presented. The studies are carried out using a highly sensitive deformation sensor with a limit level of relative deformation of 2 · 10-7 . The possibilities of optical strain measurement for solving the problem of monitoring the technical condition of the running gear of wagons and the upper structure of the track are analyzed.
NUMERICAL AND EXPERIMENTAL INVESTIGATION OF THE PHOTOTHERMAL EFFECT IN THIN FILMS OF MOLYBDENUM OXIDE DURING LASER ABLATION
Authors: ПОЛЕТАЕВ С.Д.
Published: September 2024

Проведено исследование фототермического эффекта при лазерной абляции плёнки оксида молибдена толщиной 45 нм. Представлена гипотеза о связи коэффициента теплопроводности диэлектрической плёнки с предельной величиной фототермического эффекта. Показано, что при коэффициенте теплопроводности более 5 Вт/(м · К) резко уменьшается скорость изменения температуры в начале нагрева плёнки, что вместе с особенностью распределения температуры может оказывать разнонаправленное влияние на ширину формируемого трека. Экспериментально установлено, что под действием непрерывного лазерного излучения в плёнке оксида молибдена толщиной 45 нм возможно формирование треков шириной, почти в 2 раза меньшей эффективного диаметра лазерного пучка.

The study of the photothermal effect during laser ablation of a 45 nm thick molybdenum oxide film is carried out. A hypothesis on the relationship of the thermal conductivity coefficient of the dielectric film with the limiting value of the photothermal effect is presented. It is shown that, with a thermal conductivity coefficient of more than 5 W / (m• K), the rate of temperature change decreases sharply at the beginning of heating the film, which, together with the peculiarity (singularity?) of the temperature distribution, can have a multidirectional effect on the width of the track being formed. It has been experimentally established that, under the action of continuous laser radiation in the 45 nm thick molybdenum oxide film, it is possible to form tracks with a width almost 2 times smaller than the effective diameter of the laser beam.
FUZZY CLASSIFIERS FOR PARKINSON`S DISEASE DIAGNOSIS BASED ON STATIC HANDWRITTEN DATA
Authors: ХОДАШИНСКИЙ И.А. , ШУРЫГИН Ю.А. , САРИН К.С. , БАРДАМОВА М.Б. , СЛЁЗКИН А.О. , СВЕТЛАКОВ М.О. , КОРЫШЕВ Н.П.
Published: September 2024

Диагностика болезни Паркинсона является дорогостоящей процедурой, включающей в себя транскраниальную сонографию и томографию головного мозга. В связи с этим актуальными являются простые и точные скрининговые методы диагностики. Рассматриваются вопросы анализа рукописных статичных рисунков спиралей и меандров методами машинного обучения для диагностики болезни Паркинсона на основе общедоступного набора данных HandPD. Построены нечёткие классификаторы с помощью оригинальных методов, способные по рисунку определять наличие или отсутствие болезни. Поскольку набор HandPD является несбалансированным, в работе применяются алгоритмы искусственной генерации выборок. Проведено статистическое сравнение точности применяемых моделей и методов, выполнено ранжирование признаков.

Diagnosis of Parkinson's disease is an expensive procedure that includes transcranial sonography and brain tomography. In this regard, simple and accurate screening diagnostic methods are relevant. The article deals with the analysis of handwritten static drawings of spirals and meanders using machine learning methods for diagnosing Parkinson's disease based on the publicly available HandPD dataset. Fuzzy classifiers are constructed using original methods that are able to determine the presence or absence of the disease by drawing. As the Hand PD dataset is unbalanced, oversampling algorithms are used in the work. A statistical comparison of the accuracy of the applied models and methods is carried out. The ranking of features is performed.
METHODS OF FORMING SPACE-TIME CLUSTERS OF OBJECTS IN AN UNFRIENDLY ENVIRONMENT
Authors: АБРОСИМОВ В.К. , МИХАЙЛОВА Е.С.
Published: September 2024

Рассматривается конфликтная ситуация, связанная с движением скоплений, включающих сотни объектов управления малых размеров в поле ответственности радиолокационной станции внешнего наблюдателя. Задача внешнего наблюдателя - следить и сопровождать движение скопления, а при возникновении угрожающей ситуации воздействовать на него. Задача скопления заключается в создании максимальной неопределённости принятия решения внешним наблюдателем. Модель движения скопления разработана как модель поведения роя К. Рейнольдса, дополненная специальными коэффициентами. Разработано три метода формирования различных скоплений, близких к геометрическим и изменяющимся в процессе движения формам. Сформулирована и математическим моделированием подтверждена гипотеза о том, что за счёт вариации геометрии, формы и количества объектов в роевом скоплении потенциально возможно создать ситуации, при которых рой будет восприниматься внешним наблюдателем как единый, отличающийся от исходного крупный объект. Показано, что если критерием принятия решения является значение эффективной поверхности рассеивания, то возможно создавать скопления, имитирующие опасные объекты.

The study deals with a conflict situation associated with the movement of clusters, including hundreds of small control objects in the field of responsibility of the radar station of an external observer. The task of the external observer is to monitor and trace the cluster movement and control it if a threatening situation occurs. The task of the cluster is to create the maximum possible uncertainty in decision making by the external observer. The cluster motion model is developed as K. Reynolds’ swarm behavior, supplemented by special coefficients. Three methods are developed for the formation of various cluster shapes, close to geometric and changing in the process of movement. A hypothesis is formulated and confirmed by mathematical modeling that, due to variations in the geometry, shape, and number of objects in a swarm cluster, there exist a possibility of creating situations where a swarm will be perceived by the external observer as a single large object different from the original one. It is shown that it is possible to create clusters simulating dangerous objects if the criterion for making a decision is the value of the effective scattering surface.
NON-ASYMPTOTIC CONFIDENCE ESTIMATION OF AN AUTOREGRESSIVE PARAMETER WITH UNKNOWN VARIANCE OF NOISE
Authors: ВОРОБЕЙЧИКОВ С.Э. , ПУПКОВ А.В.
Published: September 2024

Рассматривается неасимптотическая процедура построения доверительной области параметра гауссовского процесса авторегрессии p-го порядка AR(p) в случае неизвестной дисперсии шума процесса. Процедура доверительного оценивания базируется на мартингальном свойстве числителя уклонения оценки метода наименьших квадратов. Приведены результаты численного моделирования.

A non-asymptotic procedure for constructing the confidence region of the parameter of the Gaussian autoregression process of the p-th order with an unknown variance of the process noise is proposed. The confidence estimation procedure is based on the martingale property of the numerator of the deviation of the least squares estimator. The paper presents the results of numerical simulation.
ACCOUNTING FOR THE INFLUENCE OF THE CORRECTOR HYSTERESIS ON THE DYNAMIC CHARACTERISTICS OF ADAPTIVE OPTICS SYSTEMS
Authors: ЛУКИН В.П.
Published: September 2024

Продолжен анализ динамических характеристик систем адаптивной оптики, работающих в турбулентной атмосфере, в частности, влияние такого важного фактора активного зеркала-корректора, как его гистерезис. Используется аналитический подход для расчёта требований к динамическим параметрам контура обратной связи адаптивной системы фокусировки лазерного излучения через турбулентную атмосферу. Рассматриваются возможности применения в системах адаптивной оптики алгоритмов управления на основе описания их работы как системы управления постоянного запаздывания. Используется модель зеркала-корректора, учитывающая временное запаздывание между подачей сигнала и его отработкой. Для оценки частоты работы системы адаптивной оптики применяется аналитическое выражение, связывающее предельно достижимый уровень коррекции по параметру Штреля с важнейшими параметрами системы: точностью и частотой работы датчика волнового фронта, размером апертуры оптической системы, а также с параметрами атмосферы (параметром Фрида и скоростью ветра). Анализируются различия между двумя типами контуров слежения: открытым и замкнутым контурами в системах адаптивной оптики.

This article is a logical continuation of the previous analysis of the dynamic characteristics of adaptive optics systems operating in a turbulent atmosphere, in particular, the influence of such an important factor of an active corrector mirror as its hysteresis is analyzed. An analytical approach is used to calculate the requirements to the dynamic parameters of the feedback loop of an adaptive system for focusing laser radiation through a turbulent atmosphere. The possibilities of using control algorithms in adaptive optics systems based on the description of their operation as a constant delay control system are considered. A corrector mirror model is used, which takes into account the time delay between the time of the signal and the time of its processing. To estimate the frequency of operation of the adaptive optics system, an analytical expression is used that relates the maximum achievable level of correction by the Strehl parameter with the most important system parameters: the accuracy and frequency of the wavefront sensor and the aperture size of the optical system, as well as with atmospheric parameters: the Fried parameter and the wind speed. The differences between two types of tracking loops are analyzed: open and closed loops in adaptive optics systems.
MODELING OF THE OPTIMAL DESIGN OF THE COOLED THERMAL DIAPHRAGM OF THERMAL IMAGING DEVICES
Authors: НОВОСЕЛОВ А.Р. , ХРЯЩЁВ С.В. , АЛДОХИН П.А. , ДОБРОВОЛЬСКИЙ П.П. , ШАТУНОВ К.П.
Published: September 2024

Приведены результаты численного моделирования облучённости паразитным излучением охлаждаемого матричного фотоприёмника в криостате при разных формах и конструкциях холодной диафрагмы. Выяснено, что оптимальной формой холодной диафрагмы является цилиндр с двумя внутренними блендами (дополнительными диафрагмами). Уровень облучённости матричного фотоприёмника паразитным излучением составляет около 9,82 · 10-5 Вт/см2 при неравномерности распределения по площади около 3 %.

The results of numerical simulation of the irradiation by parasitic radiation of a cooled matrix photodetector in a cryostat with different shapes and designs of the cold diaphragm are presented. The optimal shape of the cold diaphragm is found to be a cylinder with two internal blends (additional diaphragms). The level of irradiation of the matrix photodetector with parasitic radiation is about 9.82×10-05 W/cm2 with an uneven distribution over the area of about 3%.
METHOD OF RECONSTRUCTION OF 3D OBJECTS BASED ON DATA FROM A SINGLE VIEW
Authors: ВЯТКИН С.И. , ДОЛГОВЕСОВ Б.С.
Published: September 2024

Предложен метод реконструкции по одному изображению криволинейных поверхностей. Для реконструкции поверхности используются данные силуэта объекта и многоуровневая карта высот. В отличие от известных подходов к реконструкции одного ракурса предлагаемый метод не имеет ограничения по глубине и требует на порядок меньше вычислений. 3D-модели с высоким разрешением могут быть сгенерированы в интерактивном режиме.

A method of reconstruction based on one image of curved surfaces is proposed. To reconstruct the surface, the object's silhouette data and a multi-level elevation map are used. Unlike the known approaches to reconstruction of a single angle, the proposed method does not have a depth limit and requires fewer calculations by an order of magnitude. High-resolution 3D models can be generated interactively.
OPTIMIZATION OF LOCAL HEAT TRANSFER IN AN IMPACT JET USING ACTIVE FLOW CONTROL AND FEEDBACK
Authors: ТОКАРЕВ М.П. , НИЧИК М.Ю. , ГОБЫЗОВ О.А. , ФЕДОТОВ И.А. , ДУЛИН В.М.
Published: September 2024

Развитие методов управления потоком и теплообменом в затопленных турбулентных струях (импактных струях), натекающих на преграду, является важной задачей, поскольку такая конфигурация используется в различных технических приложениях. Технология активного управления потоком и оптимизация сигнала, управляющего внешним возмущением расхода в импактных струях, могут быть применены для эксплуатации присущих потоку свойств в целях дальнейшего улучшения теплообмена на стенке. Использована ИК-термография и проведены измерения методом PIV (Particle Image Velocimetry) для оптической диагностики температурных полей стенки и полей скорости в условиях управления возмущением расхода, в том числе с обратной связью от локального датчика скорости. Обнаружено, что низкоамплитудные синусоидальные возмущения увеличивают интегральную температуру на стенке за счёт интенсификации отрыва потока на стенке по сравнению с невозмущённой струёй. Также установлено, что высокоамплитудные возмущения в режиме пульсирующей струи позволяют снизить интегральную температуру за счёт увеличения средней скорости потока вблизи стенки и скомпенсировать нежелательный эффект отрыва потока. Алгоритм генетического программирования позволил найти автоколебательный режим при возмущении струи с обратной связью, который улучшает локальный теплообмен на стенке не хуже, чем в случае вынужденного периодического возмущения.

The development of methods for controlling the flow and heat transfer in submerged turbulent jets (impact jets) impinging on an obstacle is an important task, because such a configuration is used in various technical applications. The active flow control technology and optimization of the signal that controls the external flow disturbance in impact jets can be applied to exploit the inherent properties of the flow to further enhance heat transfer at the wall. IR thermography is used and measurements are carried out using the PIV (Particle Image Velocimetry) method for optical diagnostics of the wall temperature fields and velocity fields under conditions of flow disturbance control, including feedback from a local velocity sensor. It is found that low-amplitude sinusoidal disturbances increase the integral temperature at the wall due to the intensification of flow separation at the wall compared to an undisturbed jet. It is also established that high-amplitude disturbances in the pulsating jet mode make it possible to reduce the integral temperature by increasing the average flow velocity near the wall and compensate for the undesirable effect of flow separation. The genetic programming algorithm makes it possible to find a self-oscillating regime during jet disturbance with feedback, which improves local heat transfer on the wall not worse than in the case of a forced periodic disturbance.
STOCHASTIC ESTIMATION OF ANGULAR ORIENTATION PARAMETERS OF A MOVING OBJECT BY INERTIAL-SATELLITE MEASUREMENTS
Authors: СОКОЛОВ С.В. , ПОГОРЕЛОВ В.А. , ОХОТНИКОВ А.Л.
Published: September 2024

Решена задача угловой ориентации подвижного объекта с использованием измерений бесплатформенной инерциальной навигационной системы (БИНС) и спутниковой навигационной системы (СНС) при самых общих предположениях о характере углового движения объекта и вероятностных характеристиках помех инерциальных измерений. Решение получено в виде расширенного фильтра Калмана, использующего в качестве оцениваемых параметров ориентации направляющие косинусы поворота в инерциальной системе координат, а в качестве вектора наблюдения - вектор измерений СНС и акселерометров БИНС. Приведён пример, иллюстрирующий высокую устойчивость и скорость сходимости процесса оценивания выбранных параметров угловой ориентации подвижного объекта.

The problem of angular orientation of a moving object using measurements of a strapless inertial navigation system (SINS) and a satellite navigation system (SNS) is solved in the general formulation with the most general assumptions about the nature of the angular motion of the object and the probabilistic characteristics of interference from inertial measurements. The solution is obtained in the form of an extended Kalman filter using the directional cosines of rotation in the inertial coordinate system as the estimated orientation parameters, and the vector of measurements of the SNC and the accelerometers of the BINC as the observation vector. An example is given illustrating the high stability and convergence rate of the process of estimating the selected parameters of the angular orientation of a moving object.
METHODS OF CHARACTERIZATION OF NARROWBAND GENERATION DYNAMICS, APPARENT FOR THE RAMAN FIBER LASER WITH RANDOMLY DISTRIBUTED FEEDBACK NEAR THE GENERATION THRESHOLD
Authors: КИРИК А.Е. , ВАТНИК И.Д. , ГОРБУНОВ О.А. , ЧУРКИН Д.В.
Published: September 2024

Узкие спектральные моды, формирующие спектр генерации волоконного лазера вынужденного комбинационного рассеяния со случайной распределённой обратной связью вблизи порога генерации, представляют большой интерес как с фундаментальной, так и с практической точки зрения. Малая спектральная ширина, стохастический характер генерации и относительно короткое время жизни предъявляют значительные требования к экспериментальному оборудованию и методикам. Обсуждаются экспериментальные подходы, позволяющие произвести всестороннюю характеризацию таких мод.

Narrow spectral modes comprising the generation spectrum of a random fiber laser near the threshold are of a great interest in both fundamental aspect and possible applications. The narrow bandwidth, stochastic generation nature, and relatively short lifetime lodge significant issues on the experimental equipment and utilized investigation methods. Possible attitudes for experimental registration and characterization of these modes are discussed in the present paper.
SEPARATION OF SPECTRAL LINES FROM A BROADBAND BACKGROUND AND NOISE FILTRATION BY THE MODIFIED TIKHONOV REGULARIZATION
Authors: ЛАРКИН И.А. , ВАГОВ А.В. , КОРЕПАНОВ В.И.
Published: September 2024

Предложена методика обработки зашумлённых спектральных данных, позволяющая реализовать математически обоснованную селекцию острых пиков сигнала на неизвестном гладком фоне, для которого отсутствует достоверная теоретическая модель. Основная идея методики состоит в построении оптимизирующего функционала, дающего наиболее вероятные параметры спектральных линий. В отличие от метода регуляризации Тихонова, где из зашумлённого сигнала выделяется гладкая неизвестная функция, в нашем случае рассматривается задача регуляризации суперпозиции гладкой функции фона с острыми пиками. Предлагаемый подход даёт алгоритм обработки экспериментальных данных, позволяющий отфильтровывать случайный шум и определять как параметры пиков, так и функцию фона с хорошей точностью. Нахождение оптимальных параметров регуляризации основано на априорных предположениях о гладкости функции фона и статистических свойствах случайного шума.

In this paper, we propose a technique for processing noisy spectral data, which allows implementing a mathematically sound selection of sharp signal peaks above an unknown smooth background, for which there is no reliable theoretical model. The main idea of the method is to construct an optimizing functional that predicts the most probable parameters of spectral lines. Unlike the Tikhonov regularization method, in which a smooth unknown function is extracted from the noisy signal, here we consider the problem of regularization of the superposition of a smooth background function with sharp peaks. The proposed approach provides an algorithm for processing experimental data that allows us to filter out random noise and determine both the parameters of the peaks and the background function with good accuracy. Finding the optimal regularization parameters is based on a priori assumptions about the smoothness of the background function and statistical properties of the random noise.
PROPERTIES OF SORBENTS FROM PINE BARK ACTIVATED BY MECHANOCHEMICAL METHODS
Authors: VEPRIKOVA E.V. , BELASH M.YU. , TARAN O.P.
Published: September 2024

The influence of pine bark pre-activation conditions: 1) in a planetary mill AGO-2, 2) with water vapor under the conditions of explosive autohydrolysis (EAH), on the sorption activity of resulting sorbents with respect to methylene blue and gelatin was studied. It is shown that explosive autohydrolysis is a more efficient method to activate pine bark, and under certain conditions it leads to an increase in the sorption of methylene blue and gelatin at least by a factor of 1.8 and 3.8, respectively, compared with the sorbent from non-activated bark. The activating treatment of pine bark in a planetary mill makes it possible to increase the sorption of methylene blue and gelatin not more than by a factor of 1.3 and 1.2, respectively. A mathematical model is obtained that describes the effect of explosive autohydrolysis conditions (water vapour pressure and duration of pine bark treatment) on the sorption properties of the resulting sorbents. Optimal conditions providing the maximal sorption of methylene blue by the obtained sorbent are determined: temperature 155 °C; water vapour pressure 2.62 MPa; processing time 58.6 s. The sorption properties of the sorbent predicted by the mathematical model have been confirmed experimentally. Sorbents from pine bark, activated by explosive autohydrolysis, surpass the industrial enterosorbent Polifepan from hydrolytic lignin in their ability to absorb methylene blue and gelatin, which indicates the prospects for their use as enterosorbents in medicine and veterinary medicine. The results of the conducted research allow us to consider pine bark as an alternative raw material that can replace hydrolytic lignin in the production of effective enterosorbents.
RHEOLOGICAL AND COLLOID-STRUCTURAL BEHAVIOUR OF HIGH-VISCOSITY CRUDE OIL AND EMULSION AFTER WAVE ACTION
Authors: LOSKUTOVA YU.V. , YUDINA N.V.
Published: September 2024

One of the main problems in oil production is the formation of stable oil-water emulsions that cause corrosion of pipelines, malfunction of pumping equipment, and poisoning of catalysts at refineries. The features of the viscosity-temperature behaviour of high-viscosity resinous crude oil from the Russkoye field (Yamal-Nenets autonomous district) and its 30 wt% emulsion after exposure to electromagnetic and low-frequency acoustic fields are investigated. Electromagnetic treatment of crude oil leads to a decrease in the phase transition temperature and the yield strength coefficient. Low-frequency acoustic processing of the emulsion is accompanied by a decrease in the effective viscosity and the yield strength coefficient. After a complex wave action, the viscosity-temperature characteristics of crude oil continue to fall, and the stability of the formed emulsions decreases due to the intense coalescence of water-phase droplets. It is shown that the amount of released asphaltenes in oil-containing systems decreases after wave treatment. On the contrary, after a complex impact, their content in crude oil increases, while in the emulsion it continues to decrease. This is likely to occur due to the release of hydrocarbons occluded in the asphaltene structure into the liquid oil phase.
BIOLOGICALLY ACTIVE SUBSTANCES IN THE ORGANS OF IRIS SETOSA (IRIDACEAE)
Authors: SEDELNIKOVA L.L. , KUKUSHKINA T.A.
Published: September 2024

The content of the main groups of biologically active substances in the flowers, leaves, rhizomes of Iris setosa cultivated under the conditions of the forest-steppe zone of the Novosibirsk Region has been determined. The content of tannins, pectins, protopectins, catechins, flavonoids, carotenoids during the seasonal development of plants was determined. It is found that tannin content in the leaves in all phenophases of I. setosa plant development is 6.3-8.5 times higher than in rhizomes. During the flowering period, flavonoid content in the leaves is 29.7 times higher than in rhizomes, during the stage of blossom fading it is 18.1 times higher, and at the stage of fruiting it is 25.1 times higher. The same accumulation of catechins (0.23-0.24 wt%) was found in underground and aboveground organs during the period of blossom fading. Pectin content in leaves during fruiting was detected to be 2.4-2.7 times higher than during flowering and blossom fading. Pectin content in rhizomes is 2.2-2.4 times higher during blossom fading and fruiting than during flowering. The content of carotenoids in flowers during flowering is 2 times higher than in rhizomes, but 2.6 times lower than in leaves. It is noted that the quantitative content of biologically active substances in the organs of I. setosa is determined by the peculiarities of growth and development during the seasonal period.