bluuebunny/crossref_metadata_2025_split huggingface dataset:
SPATIAL-SPECTRAL DESCRIPTION OF THE CURRENT DIPOLE AS A SOURCE OF THE MAGNETIC FIELD OF THE HEART
Authors: ГОЛЫШЕВ Н.В. , МОТОРИН С.В. , ГОЛЫШЕВ Д.Н. 
Published: September 2024

В реальных условиях экспериментатор работает с входными сверхпроводниковыми преобразователями, конструкция которых в биомагнитных системах зависит от условий исследований, наличия магнитной экранировки, имеющегося криогенного обеспечения, требуемой чувствительности к индукции магнитного поля, технологических возможностей разработчиков. Сравнивать результаты исследований, полученных для разных биомагнитных систем, невозможно. Рассмотрены вопросы описания источника магнитного поля сердца на основе пространственно-частотных преобразований 2D-модели токового диполя. Исследовались: глубина залегания, местоположение и ориентация токового диполя на значение индукции магнитного поля и её спектр по пространству сетки измерения магнитного поля сердца.
In real conditions, the experimenter deals with input superconducting converters, whose design in biomagnetic systems depends on the research conditions, presence of magnetic shielding, available cryogenic support, required sensitivity to magnetic field induction, and technological capabilities of developers. It is impossible to compare the results of studies obtained for different biomagnetic systems. The paper considers the issues of describing the source of the magnetic field of the heart based on the spatial-frequency transformations of the 2-D model of the current dipole. The depth of occurrence, location and orientation of the current dipole on the value of magnetic field induction and its spectrum over the space of the magnetic field measurement grid of the heart are investigated.
NEURAL NETWORK TECHNOLOGIES IN OBJECT DETECTION AND CLASSIFICATION
Authors: БОРЗОВ С.М. , НЕЖЕВЕНКО Е.С. 
Published: September 2024

Выполнен обзор основных идей, использованных при решении задач обнаружения и классификации объектов по их изображениям с применением нейросетевых технологий. Рассмотрены ключевые публикации, посвящённые наиболее популярным способам повышения точности классификации. Показано, что в последнее десятилетие нейросетевые методы обнаружения объектов достигли существенных успехов за счёт использования свёрточных технологий и практической реализации идеи глубокого обучения с применением объёмных баз данных. Проанализированы основные недостатки, ограничения и возможные направления развития существующих подходов.
The main ideas used in solving the problems of detecting and classifying objects by their images using neural network technologies are reviewed. The key publications devoted to the most popular ways to improve the accuracy of classification are considered. It is shown that neural network methods of object detection have achieved significant success in the last decade due to the use of convolutional technologies and practical implementation of the idea of deep learning using large visual databases. The main disadvantages, limitations, and possible directions of development of existing approaches are considered and analyzed.
METHODS OF FUNCTIONAL OBSERVER DESIGN FOR NONLINEAR DYNAMIC SYSTEMS
Authors: ЖИРАБОК А.Н. , ЗУЕВ А.В. , ШУМСКИЙ А.Е. 
Published: September 2024

Рассматривается задача построения функциональных наблюдателей для динамических систем, описываемых нелинейными дифференциальными уравнениями, которые подвержены внешним возмущениям. Приводятся соотношения, позволяющие построить наблюдатель пониженной размерности, нечувствительный к возмущениям, который оценивает заданную функцию вектора состояния. Теоретические результаты иллюстрируются примером.
The problem of functional observer design for dynamic systems described by nonlinear differential equations under external disturbances is considered. Relations that allow design of the observer of a reduced-order-dimensional invariant with respect to the disturbances and estimating the prescribed function of the state vector are derived. Theoretical results are illustrated by an example.
IMPLEMENTATION OF DISTRIBUTED SIMULATION IN THE MTSS SYSTEM
Authors: РУДОМЕТОВ С.В. , ОКОЛЬНИШНИКОВ В.В. , ЖУРАВЛЕВ С.С. 
Published: September 2024

В системе имитационного моделирования MTSS реализована возможность распределённого имитационного моделирования. Для реализации этой возможности применён стандарт HLA. В качестве примера использования распределённого имитационного моделирования представлена федерация, состоящая из двух федератов: имитационной модели очистного забоя угольной шахты и имитационной модели конвейерной сети угольной шахты.
The MTSS simulation system implements the possibility of distributed simulation. To implement this feature, the HLA standard is used. As an example of the use of distributed simulation, a federation consisting of two federates is presented: a simulation model of a coal mine working face and a simulation model of a coal mine conveyor network.
SEARCH FOR OPTIMAL INITIAL CONCENTRATIONS OF SUBSTANCES IN A CATALYTIC REACTION BASED ON A KINETIC MODEL
Authors: АНТИПИНА Е.В. , МУСТАФИНА С.А. , АНТИПИН А.Ф. 
Published: September 2024

Сформулирован численный алгоритм поиска оптимальных начальных концентраций веществ каталитической реакции, сочетающий принципы кинетического моделирования и эволюционных вычислений. Сформулирована задача оптимального управления каталитической реакцией, где управляющим параметром является вектор начальных концентраций исходных веществ. Описан пошаговый алгоритм решения поставленной задачи, в основу которого положен метод дифференциальной эволюции. Проведён вычислительный эксперимент для реакции аминометилирования тиолов с помощью тетраметилметандиамина. С использованием описанного алгоритма вычислены оптимальные концентрации исходных веществ, при которых достигается наибольшее значение концентрации продукта реакции. Показано, что вычисленные значения начальных концентраций веществ согласуются с результатами химического эксперимента.
The paper formulates a numerical algorithm for searching for optimal initial concentrations of substances in a catalytic reaction, which combines the principles of kinetic modeling and evolutionary calculations. The problem of optimal control of the catalytic reaction is formulated, where the control parameter is the vector of the initial concentrations of the initial substances. A step-by-step algorithm for solving the problem is described, which is based on the method of differential evolution. A computational experiment is carried out for the reaction of aminomethylation of thiols with the help of tetramethylmethanediamine. With the help of the above-described algorithm, the optimal concentrations of the initial substances are calculated, at which the highest value of the concentration of the reaction product is reached. It is shown that the calculated values of the initial concentrations of substances are consistent with the results of a chemical experiment.
CONSTRUCTION OF TEXTURE FEATURE PROFILES VIA WHOLE CORE IMAGES
Authors: МАКИЕНКО Д.О. 
Published: September 2024

Исследование изображений полноразмерного керна (образца породы, извлекаемой из скважины) востребовано в современной геофизике. Предметная область определяет специфику процессов обработки изображений керна и форму представления результатов. Обычным способом представления скважинных данных являются упорядоченные по глубине значения измерений. Образцы керна также упорядочены по глубине, а изображения образцов представляют собой набор отдельных фотографий или томографических сканов часто с отсутствием данных на некоторых глубинах. Типичное изображение одного фрагмента керна содержит метровый участок породы. При этом на практике часто требуется оценивать характеристики сантиметровых интервалов. В работе предложен подход к созданию ансамбля текстурных признаков изображений керна, представленных как упорядоченные по глубине профили, что позволяет использовать полученные результаты совместно с другими геолого-геофизическими данными.
The analysis of images of the whole core (rock sample extracted from a well) is in demand in modern geophysics. The subject area determines the manner of core image processing and the form of presentation of the results. A common form of representing well data is measured values ordered by depth. Core samples are also ordered by depth, and core sample images are a collection of individual photographs or tomographic scans often with missing data at some depths. A typical image of a core sample contains a meter-long sample of rock. At the same time, in practice, it is often required to evaluate the characteristics of centimeter intervals. This paper proposes an approach to creating an ensemble of textural features of core images, presented in the form of depth-ordered profiles, which allows the results to be used in conjunction with other geological and geophysical data.
MILLIFLUID CUVETTE FORMED BY PHOTOPOLYMER STEREOLITHOGRAPHY TO MEASURE RAMAN SCATTERING FROM SINGLE OOCYTES
Authors: ОКОТРУБ К.А. , ЗАЙЦЕВА Ю.В. , АДИЩЕВ С.В. , РАХМАНОВА Т.А. , АМСТИСЛАВСКИЙ С.Я. 
Published: September 2024

Предложено применение фотополимерной стереолитографии для создания миллифлюидных устройств для проведения спектроскопических исследований. Работоспособность подхода была продемонстрирована на примере создания миллифлюидной кюветы для исследования одиночных ооцитов мыши методом комбинационного рассеяния света (КРС) в условиях меняющегося состава окружающего раствора. Показано, что при использовании конструкции кювет типа «сэндвич» возможно проведение измерений КРС от образцов внутри кюветы, несмотря на интенсивный сигнал от материала, из которого кювета изготовлена.
Here we propose the use of photopolymer stereolithography to create millifluidic devices for spectroscopic studies. The efficiency of the approach is demonstrated by an example of the development of a millifluid cuvette for studying single mouse oocytes using Raman scattering under conditions of a varying composition of the surrounding solution. It is shown that using the “sandwich” cuvette designallows Raman measurements from samples inside the cuvette, despite the intense signal from the material from which the cuvette is made.
EXPERIMENTAL CHARACTERISTICS OF AN ATMOSPHERIC-FIBER LASER SYSTEM FOR DETECTING ACOUSTIC INFRASOUND VIBRATIONS IN GEOECOLOGICAL MONITORING TASKS
Authors: БРИТВИН А.В. , КОНЯЕВ С.И. , ПОЛЛЕР Б.В. , ПОЛЛЕР А.Б. , ХАЙРЕТДИНОВ М.С. 
Published: September 2024

Рассматривается задача измерения пространственно-временны́х и энергетических параметров акустических инфразвуковых колебаний в атмосфере на базе размещения лазерных и волоконных линий в зонах геоэкологического мониторинга. В основе измерений лежит явление акустооптического преобразования на инфранизких частотах, связанного с влиянием внешнего акустического волнового поля на характеристики распространения в этом поле лазерных импульсных пучков. В качестве внешних источников поля используются фоновые и антропогенные атмосферные акустические процессы. Измеряемым параметром является флуктуация фазы (частоты) атмосферного оптического сигнала относительно опорного оптического волоконного сигнала. Приводятся характеристики лазерной атмосферно-волоконной системы и некоторые результаты экспериментов по оценке статистики флуктуаций фазы атмосферных лазерных импульсов и параметры инфразвуковых полей в заданной атмосферной зоне мониторинга.
The problem of measuring the space-time and energy parameters of acoustic infrasound vibrations in the atmosphere based on the placement of laser and fiber lines in geoecological monitoring zones is considered. The measurements are based on the phenomenon of the acousto-optical transformation at infra-low frequencies associated with the influence of an external acoustic wave field on the characteristics of propagation of laser pulse beams in this field. Background and anthropogenic atmospheric acoustic processes are used as external sources of the field. The measured parameter is the phase (frequency) fluctuation atmospheric optical signal relative to the reference optical fiber signal. The characteristics of the atmospheric fiber laser system and some results of experiments aimed at estimating the statistics of phase fluctuations of atmospheric laser pulses and the parameters of infrasound fields in a given atmospheric monitoring zone are presented.
Doses and timing of nitrogen application on spinach productivity
Authors: Faria Layanara , De Mello Matheus Correa , Pelá Adilson 
Published: September 2024

Spinach has several relevant properties, great nutritional importance, and an affordable price, being a significant subject in various studies. However, the current literature is scarce regarding the production and nutritional requirements of this crop, with nitrogen being the element mostly required. The objective of this study was to evaluate the effect of nitrogen doses and application timings on the nutrition and productivity of spinach. The experimental design was a randomized block in a 6 x 4 factorial scheme, consisting of the combination of six N doses (0, 30, 60, 90, 120, and 150 kg ha-1) and four application timings (planting (PT), 15, 30, and 45 days after planting (DAP)) of urea nitrogen fertilizer, with four replications. The analyzed variables were chlorophyll content (CF), plant height (AP), fresh mass (MF), dry mass (MS), nitrogen content (TN), and nitrogen accumulation (AN). The data obtained were subjected to analysis of variance (F test), and the means obtained based on the N application timing were compared by Tukey's test at a 5 % probability level. For nitrogen doses, regression analysis was performed. At 15 DAP, the application of 90 kg ha-1 of nitrogen stood out, increasing productivity and obtaining 50.38 kg ha-1 of spinach. However, the productivity achieved in absence of nitrogen topdressing fertilization was satisfactory. Therefore, under conditions like those of the conducted study, it is possible to achieve good productivity and nutrition values without resorting to topdressing nitrogen fertilization, thereby emphasizing the advantage of reduced production costs.
Optimización del efecto antifúngico de extractos de ají (Capsicum frutescens) sobre el crecimiento in vitro de Moniliophthora roreri, causante de la moniliasis en cacao
Authors: Murcia Artunduaga Karen Sirley , Maca Adriana Vanessa , Suarez Collazos Katerine , Castañeda María del Rosario 
Published: September 2024

Moniliophthora roreri ha sido considerada como una de las limitaciones más preocupantes del cultivo de cacao en Colombia y el mundo, puesto que daña gravemente el fruto. Los agroquímicos aplicados no han sido suficientes para su control y generan diversas consecuencias al cultivo y a su entorno, razón por la cual el desarrollo de investigaciones dirigidas al planteamiento de alternativas de control ecológicamente viables para la salud del medio y del productor son alternativas potenciales de interés del sector, para así controlar efectivamente de la enfermedad. En Colombia existen especies vegetales con alto interés para el desarrollo biopreparados debido a sus múltiples beneficios, entre los cuales están los efectos antimicrobianos, que permiten la reducción de impactos negativos en la producción agrícola. De esta manera, el presente proyecto evaluó las condiciones óptimas del proceso de extracción de compuestos que maximizan el potencial antifúngico de Capsicum frutescens, a través el método de superficie de respuesta (MSR), bajo condiciones controladas en laboratorio, y haciendo la evaluación con factores continuos (temperatura en °C y concentración en v/v). De igual forma, se tomaron como factores categóricos el tipo de solvente A (acetato de etilo al 96 %) y E (etanol al 96 %), con lo que se encontró que las condiciones óptimas para obtener un porcentaje de inhibición superior al 90 % de M. roreri, en laboratorio, corresponden a extractos que fueron obtenidos usando como solvente acetato de etilo al 62 %, a una temperatura de 75 °C. De ello se infiere que aquellas son las condiciones que permiten un mejor arrastre de compuestos de interés antifúngico de la especie C. frutescens, por lo que podrían considerarse como materia prima potencial para la producción de insumos agrícolas biológicos.
Preoperative extracorporeal mechanical circulatory support for patients with acute severe mitral valve regurgitation due to papillary muscle necrosis
Authors: Iablonskii P. P. , Natanov R. , Kuehn C. , Ruhparwar A. , Ismail I. 
Published: September 2024

Background. Acute mitral valve insufficiency has a high mortality rate (up to 100%). Mechanical circulatory support and emergency surgery can improve the survival of this patient cohort.Objectives: to analyze a 12-year single-center experience of treating acute post-infarction mitral valve insufficiency.Materials and methods. This retrospective study included 12 adult patients with ST elevated myocardial infarction (STEMI) and corresponding acute mitral valve insufficiency who underwent surgery between 2009 and 2017. We analyzed the in-hospital period of all patients and long-term follow-ups whenever possible. All patients underwent preoperative coronary angiography and echocardiography. All patients underwent cardiopulmonary bypass and cold-blood cardio- plegia. If venoarterial extracorporeal membrane oxygenation (VA-ECMO) was required, the femoral approach was preferred.Results. Seven patients needed VA-ECMO support, six of them preoperatively; four received mechanical circulatory support outside the hospital. All patients underwent percutaneous coronary intervention (PCI) with successful revascularization of the culprit artery. All but one patient underwent surgery within the first 24 hours. One patient underwent repeat surgery once the mitral valve could be repaired, and the other patient did not require any coronary bypass. In-hospital mortality occurred in one patient in the VA-ECMO group. Patients receiving VA-ECMO had longer duration of inotropic support, ventilation time, and intensive care unit stay (p < 0.01).Conclusions. Acute mitral valve insufficiency due to STEMI remains a dramatic complication, but the perioperative use of VA-ECMO helps reduce 30-day mortality and improve outcomes in this group of patients.
Risk factors and predictors of recurrent variceal bleeding in cirrhotic patients awaiting transplantation
Authors: Korobka V. L. , Pasechnikov V. D. , Khoronko Yu. V. , Pak E. S. , Malevanny M. V. , Pasechnikov D. V. 
Published: September 2024

Objective: to identify the risk factors and predictors of recurrent variceal hemorrhage in cirrhotic patients awaiting liver transplantation (LT).Materials and methods. A comparative retrospective study was conducted in 51 patients with decompensated cirrhosis, who were on the waiting list for LT. Demographic, clinical and laboratory parameters, MELD-Na score, Child–Turcotte–Pugh score, hepatic encephalopathy grade, ascites grade, class of varicose veins, number of consecutive variceal ligations, as well as manometric study with calculation of intrahe- patic venous pressure gradient index in groups of patients with (n = 39) and without recurrent bleeding (n = 12) were analyzed. The proportions of patients in different groups were compared by the Kaplan–Meier method with determination of the logarithmic test (Log-Rank). The accumulated risks in the compared groups were estimated using the mathematical model of proportional hazards (Cox regression) in univariate and multivariate analysis.Results. Within 60 months from the beginning of follow-up and simultaneous prophylaxis by combination of non-selective beta-blockers and endoscopic variceal ligation (EVL), 39 out of 51 patients (75.6%) developed recurrent bleeding. Analysis revealed significant differences (risk factors for recurrent bleeding): creatinine le- vels, MELD-Na score, hepatic encephalopathy grade, mean hepatic venous pressure gradient (HVPG) and its level >14 mmHg. By the Kaplan–Meier method with the Log-Rank test, it was established that the proportion of patients without recurrent bleeding was significantly higher in the group of patients with HVPG ≤14 mmHg than in the group with HVPG >14 mmHg (p = 0.027).Conclusion. The main independent predictor of variceal rebleeding is HVPG >14 mm Hg, which increases the risk by 3.837 times if the gradient value is changed by 1 mm. The second independent predictor is higher hepatic encephalopathy grade: if the grade increases by one, the risk of recurrent hemorrhage increases 1.8 times.
Dois tempos históricos, dois editoriais: os sentidos do discurso
Authors: Ayres Carlos Renê 
Published: September 2024

O presente artigo se constrói no marco teórico da Análise de Discurso (AD) de linha francesa, considerando as reformulações e ampliações que têm sido propostas no Brasil. A temática abordada é constitutiva do discurso editorialista em torno da Democracia e da dinâmico do jogo político no cenário nacional. Nosso olhar repousa nos saberes próprios das formações discursivas que são constitutivas do discurso da imprensa enquanto forma de produção da opinião pública. Analisamos as marcas linguístico-discursivas buscando tornar visíveis as formas de dizer do discurso da mídia e as relações com suas condições de produção. As estruturas homogeneizadas pelo dizer comportam relações com implícitos e com um imaginário já instituído. No interdiscurso, buscamos o contínuo discursivo desencadeado pelo discurso da imprensa e neste o funcionamento ideológico que se possibilita no jogo discursivo que ali se apresenta.
Clinical and laboratory profiles of dengue fever subtypes in a tertiary care hospital in India: A retrospective study
Authors: Kamath Narayan , Das V K , Mahyavanshi Darshan , Vohra Mustafa 
Published: September 2024

Dengue fever is a viral infection transmitted by mosquitoes and manifests in different forms, ranging from classic dengue fever to more severe dengue hemorrhagic fever.: This study studies demographic, virological, clinical, hematological, and biochemical data, of dengue patient and their relationship with dengue fever type. This study analyzed data from 178 confirmed cases of dengue infection in a tertiary care hospital Union Territory of Dadra and Nagar Haveli and Daman and Diu, India. Demographic data, clinical presentations, dengue serotypes, and biochemical and hematological profiles were collected and analyzed to understand the distribution of dengue virus serotypes and the severity of clinical manifestations. The majority of patients were young males, with a mean age of 27 years. The prevalence of DENV-2 was significantly higher than that of the other serotypes, indicating its dominant circulation within the study population. The clinical features included fever (100%), headache (92.70%), myalgia (84.83%), and nausea/vomiting (64.61%). Hematological abnormalities were prevalent, including anemia (42.20% in males and 33.33% in females), thrombocytopenia (67.97%), and neutropenia (21.91%). Biochemical profiles showed elevated liver enzyme levels, with 75.84% of patients having elevated alanine aminotransferase levels. The results also showed that, as the severity of dengue fever increased, there were notable changes in hematological and biochemical parameters, such as decreased hemoglobin, hematocrit, platelet counts, elevated liver enzymes, bilirubin, and markers of renal function. This study underscores the critical need for targeted public health strategies in regions with a high prevalence of DENV-2, and the importance of specific clinical markers in managing and predicting the progression of dengue. These insights could guide therapeutic interventions and public health measures, ultimately reducing disease burden.