bluuebunny/crossref_metadata_2025_split huggingface dataset:
Composition Study for Obtaining Medium-Light Mortars by Using Spent Mushroom Substrate
Authors: Grigorescu Ramona Marina , Iancu Lorena , Ion Rodica-Mariana , David Madalina Elena 
Published: November 2024

Abstract
Besides other lignocellulose waste resulting from agriculture, spent mushroom substrate is a major concern due to the high amount of waste, usually improper disposed. Also, sand-based mortars require the use of this non-renewable and exhaustive aggregate and problems of environment protection arise. The study aims to analyze the possibilities of sand replacement in mortars composition with grounded substrate. The ratio between cement and sand in the studied compositions was 1:1, 1:2, and 1:4. The hardened mortars are analyzed in terms of colorimetric changes, density decrease, mechanical strength, hydrophobic properties, and freeze-frost resistance. Thus, medium-light mortars for applications that requires moderate strengths, with ecological implications results when up to 15% of sand is replaced with spent mushroom substrate. The results can be used for a deepen research, considering also a detailed life cycle assessment of the waste and, secondly, combining the replacement material with other waste types.
Study of the Influence of the Relative Rigidity of an Elastic Hybrid System Without Damping, on Natural Self-Pulsation, Amplitude and Dynamic Factor Due to Forced Vibration
Authors: Marin Cornel 
Published: November 2024

Abstract
The paper aims to study the dynamic behavior of a hybrid elastic system without damping consisting of a beam in a cantilever supported on helical compression springs on which an electric motor is mounted. With the help of the MATHCAD professional program, the influence of the relative stiffness of the elastic bar subjected to bending and the springs subjected to compression was simulated, on the natural pulsation, the amplitude of the vibrations and the dynamic factor of the forced vibrations for two assembly variants of the electric motor
Study of the Influence of the Dynamic Absorber on the Natural Pulsation of the Forced Vibration of an Electric Motor Mounted on a Cantilever Beam Subjected to Bending and Supported on Two Helical Compression Springs
Authors: Marin Cornel 
Published: November 2024

Abstract
The paper aims to study the dynamic behavior of an elastic mechanical system without damping consisting of two masses m1 and m2 mounted on a cantilever beam subjected to bending and supported on two helical compression springs, or the influence of the dynamic mass absorber m2 on the pulsation characteristics of the forced bending vibrations of the mass electric motor m1. Using the MATHCAD professional program, the influence of the mounting method of the dynamic absorber on the elastic system's own pulsations can be determined.
On second-order derivatives of the efficient point multifunction in parametric vector optimization problems
Authors: Pham Thanh-Hung , Nguyen Thanh-Sang 
Published: November 2024

Abstract
In this paper, we establish formulae for inner and outer evaluation of the second-order contingent derivative of index γ of the efficient point multifunction in parametric vector optimization problems. The results contained in this paper extend the results of Chuong (2013a) to the second-order sensitivity analysis case. On the other hand, examples are provided for purposes of analyzing and illustrating the obtained results. Concerning the potential domain of application, the functioning of the majority of economic systems depends on a set of indicators (criteria), i.e., the substance of economic systems includes multiple criteria and only the lack of mathematical methods in solving the problems of vector optimization is an obstacle to the effective use of the respective models. Therefore, the study of vector optimization problems is necessary and has practical significance.
A survey on UAVs security issues: attack modeling, security aspects, countermeasures, open issues
Authors: Abdullayeva Fargana , Valikhanli Orkhan 
Published: November 2024

Abstract
The Unmanned Aerial Vehicles (UAVs) are being actively used in various fields including agriculture, surveillance, scientific research, and delivery. Despite their widespread use, UAVs face significant cybersecurity challenges due to their vulnerabilities as cyber-physical systems. UAVs are vulnerable to cyberattacks, which target cyber or physical elements, the interface between them, wireless connections, or a combination of several components. Given the complexity of securing these systems, this paper provides a comprehensive survey of the current state of UAV cybersecurity. Moreover, different cybersecurity issues of UAVs are analyzed, various features, and functions of UAVs are considered. UAV attack classification scheme is constructed and attacks on various components are accounted for. Also, countermeasures against cyberattacks that target UAVs are discussed. Finally, UAV cyber security datasets for research purposes are indicated, and the remaining open issues in this field are identified.
Not all money is created equal: The concept of a hierarchy of money
Authors: Suchánek Marián 
Published: November 2024

Abstract
The concept of a hierarchy of money or the idea that a number of instruments constitute money and that they are hierarchically related to one another is relatively recent and yet quite widespread. However, it is argued, that its comprehension differs. The most elaborated cases in which differing treatments of the term can be found are Modern Money Theory (MMT) and the Money View. At first sight, the MMT’s model of money hierarchy focuses on a hierarchy within a specific unit of account whereas the Money View perceives hierarchy not only within an individual unit of account but also across various units of accounts. But, as is shown, differences are more fundamental. It is argued that different comprehension can be explained by the different distinctions between money and credit and concept of monetary sovereignty within each approach rather than the concept of hierarchy itself. The concept of hierarchy acts, in fact, as a framework that ensures consistency in the use of different money instruments on those level.
One Formalized Approach to Truncated Differential Cryptanalysis of Block Ciphers
Authors: Yakymchuk Oleksii , Yakovliev Serhii 
Published: November 2024

Abstract
We propose a formalized approach to truncated differential cryptanalysis based on ternary masks that separately account for unchanged, obligatorily changed, and unknown bits in differences. We introduce a security parameter for S-boxes and encryption mappings, which bounds the probability of truncated differentials from below, and examine its basic algebraic properties. Our approach enables the adaptation of existing techniques used in classical differential attacks to truncated differential cryptanalysis, allowing us to extract more information from the encryption process and evaluate the complexity of truncated differential attacks.
ZAGONETNA AVANTURA U VIRTUELNOJ REALNOSTI
Authors: Bulatović Danilo 
Published: November 2024

Ovaj rad opisuje razvoj igre Dungeon Quest VR, zagonetne avanture u virtuelnoj realnosti. Igra je razvijana za VR uređaje Meta Quest 2 i Meta Quest 3. Rad detaljno opisuje priču, likove, gejmplej, mehanizme igre, dizajn nivoa, audio dizajn i korisnički interfejs.
Clinical audit on postpartum hemoglobin levels: A study on postpartum anemia
Authors: John Jennifer , Arsha A. R. , Balamurugan Shalini , Thomas Tresa Remya Athipozhi , Sweta Kulkarni , Kasilingam Poovizhi , Pasupathy Sanjay 
Published: November 2024

Objectives:
The present study was carried out to assess the prevalence of anemia with reference to the Hb levels during postpartum period. The study also investigates the influence of age and mode of delivery on postpartum Hb levels.

Material and Methods:
It is a hospital-based retrospective descriptive study. The postpartum patients’ data were obtained from the medical records department of a tertiary care hospital. Data of the patients registered for routine blood investigation in the period of December 2023 to January 2024 were collected from the records. Based on patient’s hospital ID, other details including age, Hb level, and mode of delivery data were obtained. Statistical analysis was performed to check the effect of age and mode of delivery on postpartum Hb level by Pearson correlation using IBM Statistical Package for the Social Sciences Statistics version 24.0.

Results:
About 64.3% of the patients belonged to the age group of 20–30 years and remaining 35.7% within 30–40 years. The percentage of postpartum patients who underwent lower segment cesarean section (LSCS) and normal vaginal delivery (NVD) were 85.7% and 14.3%, respectively. However, cumulative percentage of NVD was higher (100%) than LSCS (85.7%). The postpartum Hb level ranged from 7.9 to 15.2 g/dL. About 54% of patients showed moderate anemia (8–10.9 g/dL), followed by 24% mild (11.9–11 g/dL) and 2% with severe anemic (<8 g/dL) condition.

Conclusion:
The study highlights the prevalence of PPA associated with both LSCS and NVD modes of delivery. Although the number of anemic patients was higher in LSCS (48) compared to NVD (8), the percentage remains the same at 80% each considering the total number of patients in each category. These observations point out the risk of high-volume blood loss associated with both modes of delivery and emphasize the need for adopting precautionary measures.
Моделирование структурНЫХ особенностей СИСТЕМЫ микросвитков диоксида титана С C-Auлегированием
Authors: Д.Н. Бухаров , А.О. Кучерик , В.Д. Самышкин , А.Ф. Лелекова , С.М. Аракелян 
Published: November 2024

Приведены результаты экспериментального синтеза системы микросвитков диоксида титана с Au наночастицами, полученные оригинальным трехэтапным методом синтеза. Приведена оценка размеров и фрактальных размерностей полученных образцов. Для описания структуры полученных образцов предложена имитационная модель в приближении клеточного автомата и диффузионно-ограниченной агрегации в рамках окрестности Неймана. Предложена модель торцевого сечения микросвитка в приближении спирали Архимеда с учетом шероховатости, определяемой в рамках диффузионного приближения, реализованного с использованием техники клеточного автомата. Для описания массива микросвитков применялось приближение диффузионно-ограниченной агрегации. Полученные величины погрешности моделирования свидетельствовали о применимости предложенных моделей для описания систем микросвитков в первом приближении.
The results of the experimental synthesis of a system of titanium dioxide micro-scrolls with Au nanoparticles obtained by the original three-stage synthesis method are presented. An estimate of the sizes and fractal dimensions of the obtained samples is given. To describe the structure of the obtained samples, a simulation model is proposed in the approximation of a cellular automaton and diffusion-limited aggregation within the Neumann neighborhood. A model of the end section of a microscroll in the Archimedes spiral approximation is proposed, taking into account the roughness determined within the framework of the diffusion approximation implemented using the cellular automaton technique. The diffusion-limited aggregation approximation was used to describe the array of micro-scrolls. The obtained values of the modeling error indicated the applicability of the proposed models to describe microsсroll systems in the first approximation.
ОСОБЕННОСТИ ВЗАИМОДЕЙСТВИЯ ГИПОФОСФИТА КАЛЬЦИЯ С ПЕРХЛОРАТОМ КАЛИЯ
Authors: А.Л. Верещагин , Е.Д. Минин , Н.В. Бычин , А.В. Сергиенко , С.С. Титов , Н.В. Титова 
Published: November 2024

Методом синхронного термического анализа исследован процесс взаимодействия перхлората калия с гипофосфитом кальция до температуры 600 °C. Установлено, что взаимодействие протекает через две экзотермические стадии в 3,55 и 1,97 кДж/г. Термическое разложение смеси состоит из двух стадий – после фазового перехода перхлората калия на первой стадии происходит его частичное взаимодействие с образованием фосфида кальция, который потом затем во второй стадии окисляется при температуре плавления перхлората калия. Методами оптической микроскопии и рентгенофазового анализа изучен состав образовавшихся конденсированных продуктов. Установлено, процесс взаимодействия смеси гипофосфита кальция с перхлоратом калия происходит в две стадии, сопровождается выделением аэрозоля фосфорной кислоты и хлорида калия, при этом образуется конденсированная фаза из фосфатов кальция и хлорида калия.
The process of interaction of potassium perchlorate with calcium hypophosphite up to a temperature of 600 °C was studied using the method of simultaneous thermal analysis. It was found that the interaction proceeds through two exothermic stages of 3.55 and 1.97 kJ/g. The thermal decomposition of the mixture consists of two stages - after the phase transition of potassium perchlorate in the first stage, its partial interaction occurs with the formation of calcium phosphide, which is then oxidized in the second stage at the melting point of potassium perchlorate. The composition of the resulting condensed products was studied using optical microscopy and X-ray phase analysis. It has been established that the process of interaction of a mixture of calcium hypophosphite with potassium perchlorate occurs in two stages, accompanied by the release of an aerosol of phosphoric acid and potassium chloride, and a condensed phase of calcium phosphates and potassium chloride is formed.
ТЕРМОГРАВИМЕТРИЧЕСКИЙ АНАЛИЗ ОБРАЗЦОВ КЕРНА СКВАЖИН ПОДЗЕМНОЙ ИССЛЕДОВАТЕЛЬСКОЙ ЛАБОРАТОРИИ
Authors: Е.Ю. Трояк , И.Н. Пожаркова , Т.А. Литвинская , Д.А. Озерский 
Published: November 2024

Статья посвящена исследованию образцов керна скважин подземной исследовательской лаборатории, расположенных в Нижне-Канском скальном массиве Красноярского края. Целью работы являлась оценка изменения свойств горной породы при воздействии высоких температур на основе результатов термогравиметрического анализа образцов. В статье описана процедура отбора материала для проведения исследования и методика выполнения натурного эксперимента с использованием лабораторного оборудования. Обоснованы условия проведения опытов, включая длительность нагрева и создаваемый температурный режим. Описаны особенности испытуемых образцов, выявленные при визуальном осмотре. Представлены результаты измерения относительной потери массы образцов после их нагрева. Установлено, что при воздействии температур в диапазоне 300–800 °C наблюдается уменьшение массы образцов керна не более, чем на 1%, что свидетельствует об отсутствии значительных изменений свойств материала под влиянием процессов дегидрации и диссоциации в условиях испытаний. Данные, полученные в ходе исследования, могут быть использованы для обоснования безопасной эксплуатации подземной исследовательской лаборатории в аварийных ситуациях, связанных с пожарами.
The article is devoted to the study of core samples from wells of an underground research laboratory located in the Nizhne-Kansky rock massif of the Krasnoyarsk Territory. The purpose of the work was to assess changes in the properties of rock when exposed to high temperatures based on the results of thermogravimetric analysis of samples. The article describes the procedure for selecting material for research and the methodology for performing a full-scale experiment using laboratory equipment. The conditions for conducting the experiments are substantiated, including the duration of heating and the temperature regime created. The features of the test samples identified during visual inspection are described. The results of measuring the relative mass loss of samples after heating are presented. It has been established that when exposed to temperatures in the range of 300–800 °C, a decrease in the mass of core samples by no more than 1% is observed, which indicates the absence of a significant change in the properties of the material under the influence of the processes of dehydration and dissociation under test conditions. Data obtained during the study can be used to justify the safe operation of an underground research laboratory in emergency situations involving fires.
АНАЛИЗ ГИСТЕРЕЗИСНЫХ СВОЙСТВ МЕЛКОКРИСТАЛЛИЧЕСКИХ БЫСТРОЗАКАЛЕННЫХ СПЛАВОВ НА ОСНОВЕ РЕДКОЗЕМЕЛЬНЫХ МЕТАЛЛОВ
Authors: А.М. Ерёмин , Н.А. Манаков , В.А. Кыров 
Published: November 2024

В данном исследовании проводится анализ процессов перемагничивания и характеристик гистерезиса в мелкокристаллических быстрозакаленных сплавах на основе редкоземельных элементов. Проведённое исследование структуры доменов и различных циклов гистерезиса указывает на то, что доменное смещение является основным механизмом перемагничивания в этих сплавах. На примере сплавов GdCo5было показано, что гистерезисные характеристики мелкокристаллических сплавов существенно отличаются от аналогичных свойств микрокристаллических материалов. Уникальные свойства гистерезиса, присущие мелкокристаллическим сплавам, могут служить экспериментальными критериями для определения ведущего механизма перемагничивания в высокоанизотропных дисперсных магнитах.
In this study, magnetization reversal processes and hysteresis characteristics in fine-crystalline rapidly quenched rare-earth alloys are analyzed. The conducted study of the domain structure and various hysteresis cycles indicates that the domain bias is the main mechanism of magnetization reversal in these alloys. Using the example of GdCo5alloys, it was shown that the hysteresis characteristics of fine-crystalline alloys differ significantly from similar properties of microcrystalline materials. The unique hysteresis properties inherent in fine-crystalline alloys can serve as experimental criteria for determining the leading mechanism of magnetization reversal in highly anisotropic dispersed magnets.
ЗАДАЧИ СО СВОБОДНЫМИ ГРАНИЦАМИ ДЛЯ ИЗОТЕРМИЧЕСКИХ ПОВЕРХНОСТЕЙ В МЕДИЦИНЕ
Authors: Ф.Х. Кудаева , И.В. Вешнева 
Published: November 2024

Задачи со свободными границами для изотермических поверхностей играют важную роль в различных областях науки и техники. Их решение позволяет решать сложные физические проблемы, оптимизировать технологические процессы, развивать вычислительные методы и получать новые знания. Изотермические поверхности являются также определяющими при прогнозировании, управлении и оптимизации тепловых процессов, а не температурное поле. Для определения поля изотерм в данной работе получена задача на сопряжение со свободной поверхностью. Предлагается метод перехода задачи определения температурного поля к задаче определения изотермических поверхностей. Доказана монотонность оператора дифференцирования, что позволило сформулировать и доказать теорему единственности задачи Стефана для поля изотерм. Доказана теорема единственности решения задачи со свободными границами для изотермических поверхностей. Полученные результаты позволят исследовать взаимосвязи между физическими параметрами и биологическими эффектами. Результаты также найдут применение в криохирургии, криоконсервации, криотерапии, гипотермии.
Free boundary problems for isothermal surfaces play an important role in various fields of science and technology. Their solution allows solving complex physical problems, optimizing technological processes, developing computational methods and gaining new knowledge. Isothermal surfaces are also crucial in the prediction, management and optimization of thermal processes, rather than the temperature field. To determine the field of isotherms in this work, the problem of conjugation with a free surface is obtained. A method is proposed for the transition of the problem of determining the temperature field to the problem of determining isothermal surfaces. The monotony of the differentiation operator is proved, which made it possible to formulate and prove the uniqueness theorem of the Stefan problem for the field of isotherms. The uniqueness theorem of solving the problem with free boundaries for isothermal surfaces is proved. The results obtained will allow us to investigate the relationship between physical parameters and biological effects. The results will also be used in cryosurgery, cryopreservation, cryotherapy, hypothermia.
REPRESENTACIONES SOCIALES DE PRODUCTOS MILAGRO EN PACIENTES CON OBESIDAD Y SOBREPESO
Authors: García Eduardo Alberto García , Patiño Donovan Casas , Torres Alejandra Rodríguez 
Published: November 2024

Objetivo: Analizar las representaciones sociales del uso de productos milagro para baja de peso en adultos con sobrepeso y obesidad (SPYO) en México.

Método: se construyó y valido un instrumento de tipo entrevista semiestructurada, se obtuvo un instrumento con 5 categorías de análisis las cuales son: conocimiento de la enfermedad, Identidad, efectos de los productos milagro, influencia de medios y percepción corporal, ya obtenido este instrumento, se procedió a entrevistar a 25 adultos con SPYO previo consentimiento informado.

Resultados y Análisis: Los adultos con SPYO hacen referencia en sus discursos a que los productos milagro son parte del tratamiento para bajar de peso, lo conciben como la cura, por su rapidez y efectividad, además comentaron que los medios de comunicación (Facebook, Instagram, tik tok y WhatsApp) son el medio por el cual conocen a estos productos, señalando ortesis, dieta milagro, suplementos, medicamentos, herbolarios, y mencionan que se pueden adquirir sin prescripción médica. Pero uno de sus efectos negativos es el apego psicológico a estos productos.

Conclusión: Este estudio nos muestra la realidad en torno a un espacio poco explorado, donde la venta, adquisición y consumo de estos productos milagro, requieren ser regulados y verificados por los posibles riegos en torno a efectos adversos para la salud, además nos muestra que en este espacio confluye un fenómeno de mercantilización en salud con consecuencias de gravedad.
Corporate Donations in the Context of Covid-19: Insights on Trust and Policy Innovation Opportunities
Authors: Victorino Guilherme 
Published: November 2024

This study aims to investigate the determinants of corporate donations during the initial phase of the Covid-19 pandemic, focusing on the Portuguese context. It explores the interplay between pandemic-related factors, corporate structures, recipient profiles, and media coverage on the levels of corporate donations. In the absence of publicly available data, a comprehensive database of corporate donations was constructed by analyzing over six thousand news pieces from various media sources between March and May 2020. The database comprises 1171 donations from 709 different institutions. The relationship between corporate donations and multiple variables was examined, including the epidemiological progression of the pandemic, corporate ownership structures, recipient characteristics, and media coverage. Our analysis reveals that during the initial wave of the Covid-19 pandemic in Portugal, corporate donations were predominantly made by large companies, primarily directed toward their local regions. Notably, nearly 93% of all donations were allocated to the National Health System. PPEs and hospital equipment were the preferred donation items among the contributing companies. These findings shed light on the factors influencing corporate donation behavior during emergency situations and provide valuable insights into trust levels within the healthcare system. This study contributes to the existing literature by offering a unique exploration of corporate donation behavior during the Covid-19 pandemic, specifically in Portugal. The comprehensive dataset and findings provide novel insights into the factors shaping corporate donation decisions during crises. Doi: 10.28991/ESJ-2024-08-05-010 Full Text: PDF