bluuebunny/crossref_metadata_2025 huggingface dataset:
Infinite-time optimal feedback control of a 3-phase asynchronous motor exploiting a nonlinear finite element model
Authors: Jedryczka Cezary , Stepien Sławomir , Demenko Andrzej , Nowakowski Mirosław
Published: December 2024

This paper presents modelling of a squirrel-cage induction motor and an optimal control method based on suboptimal control for nonlinear systems to minimise consumed energy and power losses in an induction motor drive. A coupled motor model with optimal control as a closed-loop integrated system is proposed. For modelling of the squirrel-cage asynchronous machine, a field-circuit-mechanical finite-element (FE) model is employed, in which mechanical motion is realised by a moving-mesh method and fixed mesh approach. For the control problem purpose, a surrogate induction motor model, described in a stationary rotor reference d–q frame, is applied. The optimal control is realised by a nonlinear feedback compensator method based on the state-dependent Riccati equation (SDRE) with an infinite time horizon with the surrogate model state-dependent parametrisation (SDP). To perform the control strategy, a SDRE technique with Moore–Penrose pseudoinverse is adopted. To improve the accuracy of the optimisation procedure, a finite element model was used to calculate the motor performance.
A zero-voltage-switching current source inverter with three-stage space vector modulation for low-input voltage stand-alone applications
Authors: Fu Xiaofeng , Zhang Mingkang , Ma Dazhuang , Jiang Jiahui , Cai Fenghuang
Published: December 2024

In this paper, a three-stage space vector pulse width modulation (SVPWM) along with soft switching is proposed for a high-voltage transfer ratio single-stage threephase current-source inverter (HVTR-CSI) to reduce switching losses and improve inverter efficiency. The proposed SVPWM strategy utilizes the conduction state of the energy storage switch as the zero vector and assigning effective vectors action modes. The zero-voltageswitching (ZVS) of the energy storage switch is achieved by resonant parameters and controlling the turn-on time of the active clamp circuit. The circuit topology, operation principle, high-frequency switching process of the studied CSI are thoroughly analyzed, and detailed calculations of the circuit parameters and soft-switching design are performed. Experimental results on a 1 kW 24 VDC/84 VAC 3-phase AC prototype show that the modulation improves the CSI peak efficiency by 1.15% compared to sinusoidal pulse width modulation (SPWM). This study provides an effective design approach for the HVTR-CSI in terms of reducing switching losses.
State-of-charge estimation based on improved back-propagation neural network for lithium-ion batteries in energy storage power stations
Authors: Zhu Xiaohong , Zhuang Mingwan , Yang Weirong , Li Xiuquan , Dai Hang
Published: December 2024

This paper develops a novel approach for the state of charge (SOC) estimation of Lithium-ion batteries in energy storage power stations, leveraging an improved back-propagation (BP) neural network optimized by an immune genetic algorithm (IGA). Addressing the paramount importance of accurate SOC estimation for enhancing battery management systems, this work proposes a methodological enhancement aimed at refining estimation precision and operational efficiency. First, the mechanisms of temperature, current, and voltage impacts on SOC are revealed, which serve as the inputs of the neural network. Second, the improved BP neural network’s structure and optimization through an IGA are designed, emphasizing the mitigation of traditional BP neural networks’ limitations including slow convergence speed and complex parameterization. Through an extensive experimental setup, the proposed model is validated against standard BP neural networks across various discharge experiments at different temperatures and discharge currents. Results prove that the estimation accuracy of the proposed method reaches as high as 98.15% and faster converges compared to the traditional BP network, thereby being valuable practically.
Approximation of electromagnetic force axial distribution in “single excitation coil – permanent magnet runner” module based on modified Kloss function
Authors: Bartel Sebastian Jan , Kluszczynski Krzysztof
Published: December 2024

An elementary part of various electromagnetic devices or linear electric machines is a module consisting of an excitation coil and a permanent magnet (PM runner). The electromagnetic force axial distribution in this “single excitation coil – PM runner” module is usually determined by numerical field calculations at discrete runner positions. When solving the mathematical model, a table containing discrete values of the electromagnetic force axial distribution is usually used (the so-called lookup table). The authors of this article decided to find a simple analytic function that approximates the calculated discrete electromagnetic force function with technically sufficient accuracy and the smallest possible number of coefficients. After many attempts, they proposed the modified Kloss function with 2 coefficients denoted as S′ and M′, the values of which for the best approximation have to be determined using the optimization algorithm e.g. the Hooke–Jeeves algorithm. This analytical function reflects perfectly the nature of the discrete electromagnetic force axial distribution determined by the numerical field calculations and approximates the discrete function with fully satisfactory accuracy.
Classification of leakage current odd harmonic component of aged insulator surface condition under different relative humidity using crest factor
Authors: Benisheikh Umar , Abdul-Malek Zulkurnain , Sahito Ayaz
Published: December 2024

The impact of pollution on insulator surface performance has been extensively studied to continuously improve the insulator performance using suitable condition monitoring, including using the leakage current harmonic component analysis. However, the analysis of harmonic components, particularly in relation to the odd harmonics of the leakage current in aged insulators under the influence of contamination and humidity, is still not fully understood and remains deficient. In this paper, the leakage current of aged and polluted insulators under different environmental conditions are investigated. The study was conducted experimentally using twelve samples of insulators with varying degrees of aging. The crest factor was employed as an indicator of the leakage current index. The findings showed that the odd harmonic crest factor demonstrates high sensitivity in classifying the degree of aging in contaminated insulators.
The model of mechanical stress dependence of 2D magnetic permeability of grain-oriented electrical steel sheets adaptable for finite element-based modeling
Authors: Rękas Paweł , Szewczyk Roman , Szumiata Tadeusz , Nowicki Michał
Published: December 2024

The paper presents the model of stress dependence of 2D relative magnetic permeability of anisotropic, grain-oriented M120‒27s electrical steel suitable for finite element method modeling. The proposed model was developed based on experimental results acquired using the measuring setup with a testing yoke equipped with a Cardan gyroscopic mechanism and hydraulic press. In the presented model, parameters of the tensor description of 2D relative magnetic permeability were chosen during the feature selection process and identified during differential evolution optimization. The good quality of the proposed model was quantitatively confirmed by the R-squared coefficient, which exceeds 0.997 for all plots of the 2D relative magnetic permeability tensor.
Optimal design of Vivaldi antenna with corner reflector: a Multiobjective Minimax Method
Authors: di Barba Paolo , Januszkiewicz Łukasz
Published: December 2024

The paper presents the optimization of a reflector-backed Vivaldi antenna which was designed to operate at the 1.8, 2.1, and 3.5 GHz frequencies used in the fourth and fifth generation of wireless systems. Reducing antenna back radiation is the primary goal of the optimization; at the same time, however, antenna impedance matching has to be preserved for the considered set of frequencies, this way generating a conflict of goals. The proposed design method is based on a minimax formulation of each goal against frequency and a Pareto-like tradeoff of solutions. Both goals were achieved as a consequence of the optimization process, and the antenna now exhibits a voltage standing wave ratio below 3, front-to-back ratio of 14 dB and a gain in the front direction not smaller than 8 dBi.
Rapid evolution in Turonian microcrinoids (Crinoidea, Roveacrinidae) and its significance for Late Cretaceous stratigraphy
Authors: Gale Andrew Scott
Published: December 2024

Pelagic microcrinoids from the lower and middle Turonian chalks of the Anglo-Paris Basin (southern England, northern France) have distinctive morphologies that demonstrate rapid evolution among three genera, Dentatocrinus Gale, 2019a, Drepanocrinus Jækel, 1918 and Striacrinus gen. nov., and their constituent species and subspecific formae. These form the basis for a refined biostratigraphic zonation that can be applied across the basin. The genus Striacrinus is described as new (type species Drepanocrinus striatulus Gale, 2019a), with a new species S. ornatus described from the middle Turonian. A succession of stratigraphically restricted formae are recognised within Dentatocrinus dentatus Gale, 2019a, described herein as D. dentatus forma inflatus nov., D. dentatus forma subspinosus nov., D. dentatus forma spinosus nov., and D. dentatus forma conicus nov. These formae had ranges with a mean duration of 100–200 kyr as determined from orbital precession cycles.
Are quick equivalent doses realistic? Testing range-finder luminescence dating for water-lain and postglacial flooding sediments in NE Poland
Authors: Kalińska Edyta , Alexanderson Helena , Weckwerth Piotr , Piotrowski Jan A. , Wysota Wojciech
Published: December 2024

Raw sediment samples which are without prior lengthy laboratory preparation can be used to obtain a rough but rapid estimate of the luminescence equivalent dose, and thus of the relative age of the sediment. In this study, we tested this range-finder method on clastic sediments in NE Poland for the first time, with special focus on Pleistocene meltwater sediments generated by highly energetic glacial lake outburst floods, and the post-flooding sediments. Two datasets with known doses from standard measurements were compared to range-finder doses determined from quartz and feldspar in untreated sediments. We found statistically significant correlation between equivalent doses of (1) standard quartz optically stimulated luminescence (OSL) and range-finder feldspar infrared stimulated luminescence (IRSL) at 50 ºC, and (2) standard quartz OSL and range-finder quartz OSL in low-dose samples (<80 Gy). However, these correlations should only be considered as approximate whereby preparing more than three range-finder aliquots has the potential of yielding more accurate results. Correlation between the range-finder quartz OSL and range-finder feldspar IRSL is also significant. The rangefinder measurements can be used for approximate dose determination to preliminary assess the sediment age or as a selection tool to avoid incompletely bleached samples. The sedimentary environment and especially sediment reworking and transportation seem to influence these correlations. We consider the sediments studied here to have undergone between one and four reworking stages, and samples with repeated reworking usually represent well-bleached material for luminescence dating.
Reducing the Operation Lead Time using Integrated Standardized Service Time and Tailor-Made Value Stream Mapping
Authors: Nurprihatin Filscha , LEE Francka Sakti , Andry Johanes Fernandes , KURAHMAN Anisa Pitriani , WIDIWATI Ivana Tita Bella , VAEZI Ali , ABUSHAEGA Mastoor M.
Published: December 2024

This study measures the performance of service operations of a café with waiting and service time parameters for customer satisfaction. The study contributes to reducing the lead time through standardized service time using Tailor-made Value Stream Mapping, Root Cause Analysis (RCA), and Time Study. This study observes the writer during a service operation at a café. The current state of VSM is created and followed by time study and analysis. The RCA is constructed based on brainstorming activity. It is suggested to improve the current process which is reflected in the future-state VSM. Lastly, this paper compares overall performance before and after the improvement implementation to conclude the effectiveness of this study. The result shows the increasing performance for food and beverage service in terms of VA, NNVA, NVA, LT, and PCE indicators. Ultimately, the lead times for serving beverages and appetizers decreased by 2.654 and 13.13 minutes, respectively
Disruptions in Supply Chains in the Automotive Industry During the COVID-19 Pandemic. The Case of Polish Companies– the Perspective of the Main Supply Market
Authors: ROKICKI Tomasz , SZEBERENYI András
Published: December 2024

The main aim of this article is to present the supply chain disruptions experienced by automo tive companies during the COVID-19 pandemic, with a particular focus on the characteristics of their primary supply markets. The automotive companies surveyed were links directly or indirectly with production in this industry. Disruptions in supply chains significantly af fected planning and production continuity throughout the industry. The empirical data were sourced from a survey conducted in June 2023, involving 500 companies. During the COVID 19 pandemic, automotive companies encountered a series of disruptions within their supply chains, including constrained delivery timelines, prolonged lead times, and escalated opera tional costs. The character of a company’s primary supply market significantly influenced the duration of these pandemic-induced supply chain disturbances and the pace of recovery to wards normal business operations. Disruptions were more prevalent among companies reliant on global supply sources as opposed to those with predominantly local supply chains.
A New Robust Confidence Interval for the Population Meanba sed on Winsorized Modified One Step M-Estimator and Winsorized Standard Deviation
Authors: HADDAD Firas , ABU-SHAWIESH Moustafa
Published: December 2024

In this paper, we propose a new confidence interval (CI) for the population mean based on robust estimators, which involves the application of the winsorized modified one-step M-estimator (WMOM) and winsorized standard deviation (WSD). The proposed method is modified for the Student’s t confidence interval CI under the non-normal distribution. The performances of the proposed confidence interval were evaluated via a Monte-Carlo simulation study by considering the coverage ratio (CR) and the average length (AL) as performance criteria. The simulation study results show the superior performance of the proposed confidence interval (CI) over the classical parametric Student’s t for data from a non-normal distribution. Two real data sets were analyzed, and the results agree to some extent with those of the simulation study. The results confirm the suitability of the proposed CI estimator for both normally and non-normally distributed data.
Unveiling Trends of Chatbot and Conversational Agents: A Bibliometric Study
Authors: Alasali Tasnim K. , Dakkak Omar , Türker İlker
Published: December 2024

Recent years have seen remarkable growth and diversification in the study of chatbots and conversational agents. This research employs bibliometric and network -analytical methodology to thoroughly investigate the latest trends and themes in chatbot technology, a topic that has gained prominence in contemporary research discourse. The primary aim for this paper is to examine the evolution, prevailing trends, and provide an extensive overview of the chatbot field. Using the Web of Science core collection database, this study evaluates articles published from 1980 to 2024 by scanning over 7327 journal articles, ultimately focusing on 2622 key articles from prominent journals, institutions, and authors in the field. Key findings indicate a consistent increase in publication count related to chatbots recently. The study also identifies discrimination for critical areas such as advancements in artificial intelligence, machine learning, and natural language processing and underscores the importance of quantitatively assessing their impact and applications in diverse areas. Additionally, it sheds light on the collaboration among researchers, institutions, and nations in the development of this field. Furthermore, an analysis of written abstracts indicates a concentrated effort on enhancing user interactions and the technological progression of chatbots. The findings of this study provide insight into various sectors related to the development of chatbot technology in digital communication and AI advancement. Therefore, this bibliometric analysis offers a unique and in-depth view of the evolving chatbot research landscape, serving as a valuable guide for future research and strategic planning in this rapidly advancing area.
Public Transport Demand Elasticities in Developing Agglomerations: The Case of Tunisian Regions
Authors: Makhlouf Lassaad
Published: December 2024

This paper examined the characteristics of public transport demand in some major Tunisian cities. It followed the research trend which calculated the public transport demand elasticities. The adopted procedure in this study consists in estimating a log linear dynamic panel model relating per capita bus patronage to bus fares, users’ income, and service quality. Two variants of the basic model were estimated for the most important Tunisian agglomerations for the period 2003-2020. In the first variant, this paper considered the same fare elasticity value for the different regions, whereas in the second it’s proceeded to the calculation of specific fare elasticity values for each region. The estimation results show interesting and different elasticities compared to those revealed by earlier studies for occidental agglomerations. This result can be explained by specifics users’ characteristics and networks’ configuration. Although these results may sometimes contradict the theoretical suggestions, they still highlight the specificities of the public transport demand in Tunisia and its users’ characteristics. The demand for public transport in large Tunisian agglomerations is not very sensitive to fares changes. Second, income does not have the same effect as that advocated by economic theories. Indeed, we have found a positive impact of income on demand for public transport. Finally, the quality of service has the most important effect on demand. Changes in travel habits and cultures, improvements in the quality of services and their differentiation can be more effective for public transport than fares changes.
“Anyway, We Delivered the Bomb”: Dredging the Disaster of the USS Indianapolis from History to Hollywood
Authors: Croft Sebastian
Published: December 2024

“Anyway, we delivered the bomb” is an analysis of the significance of the inclusion of the critically acclaimed “Indianapolis speech” within Steven Spielberg’s Jaws, whereby the shark hunter Quint delivers a chilling first-hand recollection of the disaster of the USS during the Second World War. As Quint tells it, after transporting components of the atomic bomb to the United States air base at Tinian Island, the USS Indianapolis was torpedoed by a Japanese submarine whilst on route to the island of Leyte, leaving Quint and his surviving shipmates to fend for themselves in shark-infested waters. Contextualizing the speech within the confidence crises and “disaster” film genre cycle of 1970s America, I shall analyze how Jaws’s representation of the Indianapolis disaster posits a direct challenge to the orthodox Hiroshima narrative (that the bombing was morally justifiable on the basis that it saved American lives) by foregrounding the suffering endured by the crew of the Indianapolis at the expense of delivering it, preying upon audience fears that an America reeling from the Watergate scandal and military defeat in Vietnam was now susceptible to moral ‒ and nuclear ‒ retribution for Hiroshima thirty years later.
The Role of Self-efficacy in Foreign Language Acquisition
Authors: Cedzich Artur
Published: December 2024

The aim of this article is to investigate the impact of self-efficacy on Foreign Language Acquisition in secondary school students following a relatively recent shift of focus in the field, as the learner’s needs, efforts and capacities have been placed at the centre of the learning process. Hence the need to address the existing research gap by proving that self-efficacy may be viewed as a significant indicator of foreign language proficiency. Apart from presenting the theoretical background, the article also reveals the empirical findings of the research carried out in a higher secondary school on 78 participants (N = 78). The study suggests that highly efficacious students receive the highest English mean grade, that they are competent foreign language users and are confident about their skills, and approach the FL learning progress more consistently, not being discouraged by taking risks in the foreign language acquisition context and confronting situations which cannot be foreseen. In stark contrast are learners scoring low levels of self-efficacy who are more likely to engage in procrastination, have a lower mean of English grades and are not eager to participate actively in the foreign language acquisition classroom. The article concludes with a number of implications and recommendations which may be implemented in the future teaching methodology, particularly indicating other research directions.
Transient stability enhancement of virtual synchronous generators with virtual resistance
Authors: Ebinyu Emmanuel , Abdel-Rahim Omar , Abdelkader Sobhy M. , Shoyama Masahito , Mansour Diaa-Eldin A.
Published: December 2024

Virtual synchronous generators (VSGs) incorporate virtual resistance (VR) in inverter control as a damping mechanism for oscillations that appear around the synchronous frequency due to interactions between the inverter impedance and the line impedance while operating in low inertia grids. Damping is critical for synchronization stability in the small-signal and large-signal disturbance scenarios to suppress oscillations that threaten system stability. While VR enhances stability in the steady state, it is shown that its conventional application affects the transient stability of VSGs by reducing the angle overshoot range in the dynamic behaviour of the power angle δ, illustrated using the power-angle (P − δ) and frequency-angle (δ̇− δ) curves. In this article, a novel damping mechanism to improve the transient stability of VSGs using VR to enhance the power angle dynamics is proposed. By using the concept of virtual point of common coupling, the virtual power of the internal VSG is introduced in the active power feedback during a voltage sag, providing an equivalent damping effect proportional to the VR applied. In this way, the negative effects of VR on transient stability are averted while VR is used to improve the power angle dynamics of conventional VSG. Simulations of different transient stability scenarios are carried out in MATLAB/Simulink to verify the proposed method.
Experimental investigation of field electron emission from uncoated and coated graphite fiber tips
Authors: Fuqara Zaid K. , Mousa Marwan S. , Assa’d Jaber Ahmad M. D. , Al-Akhras M.-Ali H. , Al Braikat Hatem A. , Al-Hroub Qassim A.
Published: December 2024

This study investigates the field emission characteristics of coated and uncoated graphite fiber tips under high vacuum conditions in the pressure range of 10–6 Pa. A 2 M Sodium hydroxide (NaOH) solution was used in the electrochemical etching procedure to produce an uncoated etched graphite fiber emitter with a diameter of 436.5 nm. An epoxy coating 2301 dielectric material with a thickness of 61 ± 1 nm was used to coat the fiber tip. Field-emitter emission micrographs, current stability, and current-voltage (I-V) characteristics were recorded. Murphy’s Good plots were used to examine and analyse the I-V characteristics. An orthodoxy test was performed to evaluate the Murphy Good plots. In the reported results, at low applied voltages, the uncoated graphite fiber emitter passed orthodoxy tests, and generated a steady current with 0.03 µA uncertainty. However, the coated graphite fiber emitter showed an increase in the applied voltage and threshold voltages but had no impact on the sample emission characteristics.
Partial discharge noise comparison and recognition method based on multi-channel smooth decoherence algorithm applied to GIS
Authors: Du Fei , Xu Yuan , Yuan Shuai , Bi Jiangang , Jiang Jinpeng , Zhu Xueqiong
Published: December 2024

In order to further improve the accuracy of the online monitoring spectra of partial discharge in gas insulated switchgear, a partial discharge distributed monitoring system is studied, and distributed sensors are used to simultaneously obtain ultra-high frequency electromagnetic wave signals. Based on the accumulated partial discharge spectra of each sensor, the smooth decoherence noise recognition algorithm is proposed on a long-term cumulative spectral pattern, which is used to analyse the correlation between the spectra of each sensor. Furthermore, a method for determining whether partial discharge is an internal signal is proposed, and its effectiveness is verified by practice, the results confirmed that the algorithm can avoid the misjudgement of partial discharge results caused by distributed sensor interference.
Viscoelastic Models of Tissues. Mathematical Background and Hysteresis Loops
Authors: Minárová Mária , Tvrdá Kataŕına , Zajícová Soňa
Published: December 2024

Human, animal, and plant tissues are typically viscoelastic, meaning their mechanical response lies between purely viscous and purely elastic behaviour. These tissues exhibit both viscous and elastic properties, modeled using viscoelastic frameworks. The mechanical behaviour of viscoelastic materials is determined by the relationship between stress σ and strain ε, referred to as the constitutive equation. In viscoelastic models, both stress and strain are functions of time. These models are often constructed using parallel or serial combinations of elementary components: Hookean elastic elements (H)and Newtonian viscous elements (N). The configurations formed through these combinations yield specific geometric equations which, when combined with physical equations, determine the corresponding global constitutive relations.

This study presents an analysis and theoretical results related to an approximate viscoelastic model for aponeurosis, specifically represented by the Burgers model.
Combatir el discurso de odio, un imperativo universal
Authors: Solano Bárcenas Orlando
Published: December 2024

En colaboración con la Oficina de las Naciones Unidas para la Prevención del Genocidio y la Responsabilidad de Proteger (OSAPG), la UNESCO ha publicado una guía destinada a combatir el discurso de odio mediante la educación. Este documento presenta recomendaciones prácticas para fortalecer los sistemas educativos, con el objetivo de frenar la propagación del odio, tanto en el entorno digital como en el mundo físico. La clave radica en utilizar la educación para combatir esta plaga, creando entornos de aprendizaje seguros y respetuosos que fomenten sociedades más inclusivas, libres de sentimientos tan destructivos y perversos. A través de estrategias que aborden las teorías conspirativas y la desinformación, se busca reducir o eliminar ideas excluyentes y violentas que afectan tanto la vida personal como la convivencia social. La universidad colombiana tiene la responsabilidad de aplicar las recomendaciones de textos tan significativos para la paz tanto a nivel nacional como global. Misión Jurídica se enorgullece de unirse a este importante esfuerzo.
“Novo” constitucionalismo, velhos problemas: democracia e autoritarismo na América Latina
Authors: Carpendedo Alexandre de Freitas
Published: December 2024

The present work aims at analyzing two problems, which have been verified for a long time in Latin America, and the proposal for their overcoming from a specific epistemology: the lack of consolidation of democracy and authoritarianism, seen from the so-called “new” Latin constitutionalism. American From the research problem (“has the 'new' Latin American constitutionalism been able to solve the historical problems related to democracy and authoritarianism in Latin America?”), the objective is to verify how the region and its institutions have sought to maintain democratic values. Indeed, Latin America has in its history long periods of dictatorships, false democracies, oligarchic and autocratic governments, interspersed with brief periods of democracy. As theoretical references, the works of Roberto Gargarella (La sala de máquinas de La Constitución: dos siglos del constitucionalismo en América Latina (1810-2010)) and Waldo Ansaldi and Verónica Giordano (América Latina: la construcción del orden) are adopted. As a method of approach, the methodology of historical sociology is chosen, which acquires relevance to think about the processes of Latin American democracy and authoritarianism in a long-term logic, capable of demonstrating whether the political problems of the region constitute, or not, historical regularity. It is concluded that Latin American constitutionalism has not been able to overcome the historical culture of authoritarianism in the region. The absence of deeper ruptures with established power structures and the lack of true democratization of political and social processes have resulted in a fragile democracy subject to constant crises.
La philosophie comme esthétique de l’allégresse
Authors: Poulain Jacques
Published: December 2024

En retraçant la dynamique de la communication à la base de toute expérience, l’anthropobiologie d’A. Gehlen (2021) a montré que l’avorton chronique qu’est l’être humain a dû, pour pouvoir vivre, se fixer au langage en faisant parler le monde. Pourquoi ? Pour y retrouver le même bonheur que celui qu’il avait pris à l’écoute de la voix de la mère dans l’écoute intra-utérine, ainsi que l’a découvert Alfred Tomatis (1977 ; 1991). Parce que l’être humain n’est pas un être biologiquement bien formé et est né un an trop tôt comme l’a découvert L. Bolk, corroboré Otto Schindewolf et développé S. J. Gould – si on le compare aux mammifères pourvus d’une complexité semblable – il n’est doté que d’instincts intraspécifiques (nutritionnels, sexuels et défensifs) [...]
Conflictogenicity of secondary employment of students (based on the materials of an interdisciplinary study of students in Barnaul)
Authors: Kolegaeva Elizaveta Aleksandrovna , ZHeldakova Arina Vladimirovna , Klimova Anastasiya Alekseevna , Maslov Vladislav Sergeevich , Perin Sergei Aleksandrovich , Ahmedova Angelina Rustamovna
Published: December 2024

The study of the conflictogenicity of secondary employment is relevant in the modern labor market, where many people, including students, choose additional work. The article analyzes the reasons why students choose additional work, including financial independence and the desire for self-development. Both positive and negative consequences of secondary employment of students are considered. The study was conducted using a sociological survey among students in Barnaul, as well as expert interviews with teachers. The article emphasizes the need for an integrated approach to solving problems associated with the conflictogenic nature of secondary employment, including support measures from the state and educational institutions. The results of the study indicate the importance of a balance between education and labor activity of working students. As part of the study of the selected topic, a methodology was developed and a sociological study was conducted among working students of educational institutions in Barnaul. The study was conducted using a questionnaire method, in which 322 respondents took part. The sample was formed by a non-random method of typical representatives. The sample size was determined by the capabilities of the researcher. At the second stage, expert surveys were conducted (n = 15). This study allows us to understand in detail the phenomenon of secondary employment of students and its conflictogenicity. The results of the study indicate the importance of a balance between education and work, emphasizing the need to regulate the level of student employment. The author's special contribution to the study of the topic is the emphasis on the special importance of a comprehensive solution to the problem of conflict in secondary employment with the participation of the state and universities, as well as with the active position of the students themselves.
Behind the Paper Veil: Exploring Performative Femininity in Susan Sontag’s As Consciousness is Harnessed to Flesh: Diaries 1964-1980
Authors:   University of Wrocław, Bartusiak Martyna
Published: December 2024

In 1990, Judith Butler’s work titled Gender Trouble introduced the definition of
gender performativity into the critical discourse regarding gender identities. Butler’s
definition, though initially pertaining to the social aspect of gender identity, delineates the
performance of gender as an act of social self-expression. In the case of women, however,
gender performativity has become a method of self-adjustment to patriarchal demands.
Moreover, traces of performative femininity permeate the writing of female diarists who
use their diaries not only as a site for self-creation, but also a tool for gaining social
acceptance in a patriarchal environment through their performance of femininity. My
analysis, focused on Susan Sontag’s As Consciousness is Harnessed to Flesh: Diaries
1964-1980, aims to reveal the influence of performative femininity onto her internal
dialogue, and establish connection between both the causes and nature of her gender
performance and her use of a diary as a site of performance.
Analysis of characteristics of Mandelstam–Brillouin scattering in varieties of erbium optical fibers
Authors:   Omsk State Technical University, Bogachkov I. V.
Published: December 2024

The research presents the results of testing the Mandelstam–Brillouin scattering
parameters for several types of optical fibers doped with erbium and cerium ions.
The obtained Brillouin reflectograms of different types are shown. The frequency
characteristics of Brillouin scattering are drawn. Estimates of the initial values of the
Brillouin frequency shift and the behavior of the reflectograms of the back reflected
signal level for the studied fiber varieties are presented. A comparative analysis of
the obtained parameters of various types of erbium optical fibers is carried out.
Theoretical assessment of the stability of a digital thermocompensated quartz oscillator with temperature sensor based on two auxiliary quartz oscillators
Authors:   Omsk State Technical University, Kulyasov S. M. , Chetter D. M. ,   Omsk State Technical University, Lyashuk A. N. ,   Omsk State Technical University
Published: December 2024

The article provides a theoretical limit assessment of the stability of a digital
thermocompensated quartz oscillator with a temperature sensor based on two
auxiliary quartz oscillators. The results are 7,5 ppb (for a restless environment) and
0,75 ppb (for a calm environment). Technical solutions are considered for obtaining
a linear one-to-one dependence of the difference frequency value on temperature
and increasing the steepness of this dependence. The proposed solutions allow
obtaining a temperature measurement resolution of up to 0,001 ºС.
Modification of changes in the stress-strain state of crane slewing gear elements while operational conditions
Authors:   Russian University of Transport, Sladkova L. A. , Fokin V. V. ,   Russian University of Transport
Published: December 2024

Despite the high technical level of hoisting equipment purchased abroad, a
catastrophic failure of the slewing bearings of these cranes occurs after 3-5 years
of service instead of the regulated 15 years. The most characteristic are: wear of
6-polyamide cassettes, cages of gear teeth and turntable; rolling elements falling
out of the turntable; squeezing out the sealing tape. To identify the hidden cause
of premature failure of the slewing rings of «Liebherr» cranes, the authors carried
out the experiment during loading and unloading operations, which shows the
tendency of warming up the elements of the slewing support, considering the cyclic
nature of the crane operation. It has been established that this process is linear
both for cassettes (polyamide 6 material), in which the rolling elements are located,and for the rolling elements themselves (bearing steel). For 5 loading cycles, the
rolling elements warm up to a 40 mm depth to a temperature of about 40-45° C.
The proposed working hypothesis allows identifing the hidden cause of premature
failure of the slewing support of «Liebherr» cranes operating in central Russia. A
change in the stress-strain state of the cassette is established, leading to an increase
in wear of the cassettes and rolling elements, since stresses arise between the end
of the roller surface and the cassette in the direction of the contact plane.
Interval sets in applied geometry
Authors:   Omsk State Technical University, Yurkov V. Yu.
Published: December 2024

Geometric modeling of interval sets of multidimensional space is considered. The
interval set is determined as a set of k-planes of uncertain interval parameters.
Interval parameters may be given by means of interval basis which are k-simplexes
having vertex coordinates which are not fully presented (only up to range of
values). Geometric images of the sets have combinatorial structure formed by some
part of the space and bordered by a set of peace linear hyper-surfaces. Analytic
model is a system of interval equations which may be transformed to equations with
uncertain parameters. The set of interval parameters generate an interval function
and geometric image of it is some domain in parametric space. Analyses of mutual
position of all domains allows us to determine the behavior of interval sets. Some
properties of interval line sets are considered in detail as examples of the proposed
approach.
Theoretical study of kinematic pairs «torus with torus» based on geometric kinematics
Authors:   Omsk Tank-Automotive  Engineering Institute, Shamutdinov A. Kh. , Lesnyak I. Yu. ,   Omsk State Technical University
Published: December 2024

The article presents a theoretical study of kinematic pairs known as «rolling pairs»
used in many areas of mechanical engineering, in particular, mechanisms. The
research concerns such bodies (links) as geometric tori, which are well-known
bodies of rotation. From the geometric kinematics, new representations of the
mechanical motions of a torus in a «torus-torus» connection are described without
the reasons that cause this motion. Two options for connecting two tori are analyzed:
the axes of the tori are parallel and perpendicular. By analogy, the analysis of
kinematic pairs of this type expands the elements of kinematic pairs theory and
allows developing their new variants in many mechanisms used in various fields of
mechanical engineering.
Reduction of injury rate when introducing automated control systems of production processes at energy enterprises
Authors:   Kazan State Power  Engineering University, Pigilova R. N. , Filippova F. M. ,   Kazan State Power  Engineering University, Averyanova Yu. A. ,   Kazan State Power  Engineering University
Published: December 2024

The research examines a number of measures to prevent accidents at industrial
enterprises. Therefore, the study of the most likely dangerous and harmful production
factors and a statistical analysis of emergency situations in the energy sector of
the industry over the past seven years were initially conducted. The research
showed that an automated process control system is the most effective tool: it
provides operational information about the process, the condition of equipment
and controls, significantly reduces non-production costs and energy losses. It is
proposed to strengthen the automated process control system by integrating
operational dispatch control modules and maintenance of the production process
in order to reduce injuries due to the human factor.
Building cost management systems for quality assurance at Russian defense enterprises
Authors:   JSC «Scientific Research Institute of Steel», Baldina A. S.
Published: December 2024

The article examines the issues of system management of quality assurance costs at
Russian defense enterprises. The relevance of the work is determined by the increased
requirements for saving resources that are currently imposed on enterprises of the
military-industrial complex. The purpose of the work is to develop recommendations
for building a quality cost management system at Russian defense enterprises based
on a process approach. This work is based on the results of research by Russian
and foreign scientists in the field of quality cost management, reflected in scientific
articles, monographs, textbooks. In addition, publications of practitioners in the
field of quality management in industry journals and on specialized Internet portals
were used. The author offers a generalized model of the system of formation
of costs for ensuring the quality of products. When managing quality costs, it is
proposed to initially start from the prices of the designed products. On their basis,
the optimal (taking into account existing conditions) production cost of products is
calculated. Cost data is used as a guideline for R&D. Special attention is paid to the
formation of responsibility centers in the quality cost management system.
Increasing the capacity of electric grids based on the integration of meteorological data
Authors:   Omsk State Technical University, Kletsel M. Ya. , Petrova E. V. ,   Omsk State Technical University, Girshin S. S. ,   Omsk State Technical University, Krivolapov V. A. ,   Omsk State Technical University, Goryunov V. N. ,   Omsk State Technical University, Trotsenko V. M. ,   Omsk State Technical University
Published: December 2024

The efficient and sustainable functioning of energy systems is a critical element for
supplying of electricity necessary to maintain the vital functions of modern society.
Therefore, the integration of meteorological data into the management of electrical
grids is becoming increasingly important.
Meteorological data, such as information on weather conditions, temperature, wind
and precipitation, play an essential role in the operational and strategic management
of power systems. Their use allows optimizing the operation of generating and
distribution stations, using the maximum capacity of lines, as well as improve the
planning of repair work and infrastructure upgrades. On the basis of the weather
conditions, operators of electric power grids can make more informed decisions
regarding the distribution and management of energy resources.
The research is aimed at determining the role of meteorological data in the
management strategies of modern energy systems.
Refined analysis of the limit modes of overhead power lines
Authors:   Omsk State Technical University, Girshin S. S. , Deev V. A. ,   Omsk State Technical University, Petrova E. V. ,   Omsk State Technical University, Kropotin O. V. ,   Omsk State Technical University, Krivolapov V. A. ,   Omsk State Technical University, Goryunov V. N. ,   Omsk State Technical University
Published: December 2024

The article analyzes the limiting modes of overhead power transmission lines in terms
of heating and voltage losses. The equations linking the wire temperature, voltage
loss, load power, cooling conditions and line parameters are obtained. Depending
on the length, three characteristic regions can be distinguished in which the limiting
modes are determined either only by heating, or only by voltage loss, or both. A
combined limit mode is considered separately, in which the wire temperature and
voltage loss simultaneously assume the maximum permissible values. New refined
criteria for assessing the admissibility of the line mode have been obtained. As an
example, the AC-240 line with a 220 kV voltage of varying length is considered,
for which a number of dependencies characterizing the areas of existence and
conditions for the occurrence of limit modes are constructed.
Assistência em enfermagem em pacientes gestantes com anemia ferropriva
Authors: Guimarães Ana Júlia Silva , Pereira Carine dos Santos , Dias Hitalo Vinicius Rodrigues , Silva Nara rúbia Rodrigues do Nascimento
Published: December 2024

Objetivo: Investigar o papel da enfermagem no cuidado pré-natal, focando no manejo da anemia ferropriva em gestantes. Métodos: Este estudo foi conduzido por meio de uma revisão integrativa, utilizou artigos das bases de dados: Biblioteca Virtual em Saúde (BVS), Scientific Electronic Library Online (SciELO), Literatura Latino-Americana e do Caribe em Ciências em Saúde (LILACS) e Google Acadêmico, selecionando publicações de 2014 a 2024 que tratassem da assistência de enfermagem a gestantes com anemia ferropriva. Resultados: A pesquisa evidenciou que a atuação proativa dos enfermeiros, através da Sistematização da Assistência de Enfermagem e da Classificação Internacional para a Prática de Enfermagem, é fundamental para um cuidado eficaz. Desafios como a adesão ao tratamento e efeitos colaterais do sulfato ferroso foram identificados como impactantes na qualidade do atendimento. A educação em saúde emergiu como essencial para prevenir e tratar a anemia ferropriva, promovendo escolhas alimentares saudáveis e a importância da suplementação de ferro. Considerações finais: Fortalecer a educação em saúde e capacitar continuamente os profissionais de enfermagem são essenciais para melhorar a adesão ao tratamento, embora limitações como a falta de recursos e infraestrutura comprometam a implementação dos cuidados adequados.