bluuebunny/crossref_metadata_2025 huggingface dataset:
Applications of fractal analysis techniques in magnetic resonance imaging and computed tomography for stroke diagnosis and stroke-related brain damage: a narrative review
Authors: Maryenko Nataliia I.
Published: November 2024

The fractal analysis technique has emerged as a novel and promising method in mathematical analysis, providing valuable insights across various fields of neuroimaging. The fractal analysis technique allows for the quantitative characterization of complex geometric structures that traditional Euclidean geometry-based morphometric methods fail to describe adequately. This review provides an overview of the principles, characteristics, and main applications of the fractal analysis technique, focusing on its applications and perspectives in stroke diagnosis based on neuroimaging data. In stroke research, the fractal analysis technique has been used to characterize brain tissue, pathological foci, and the vascular network, providing critical diagnostic and prognostic information. Researchers have applied the fractal analysis technique to brain lesions resulting from ischemic strokes to conduct geometric analyses of lesion shapes, indicating its diagnostic and prognostic values. Fractal properties have been used to study the texture of lesions, healthy tissue, and penumbra zones, which is essential for determining the presence and boundaries of damaged brain tissue. Additionally, fractal analysis of intracerebral hemorrhages has shown that hemorrhage geometry is correlated with prognosis and survival rates. This method has been used to assess cortex and white matter configurations in stroke patients, highlighting brain remodeling and compensatory changes. It has also been proven effective in detecting morphological alterations in brain structures during transient ischemic attacks. Moreover, fractal analysis of the brain vasculature revealed changes associated with ischemic stroke and hemorrhage. Overall, the fractal analysis technique in brain magnetic resonance imaging and computed tomography is an informative and sensitive imaging analysis method that, with further development, can significantly improve stroke diagnosis and prognosis on the basis of neuroimaging data.
Advancing Proton Therapy: A Review of Geant4 Simulation for Enhanced Planning and Optimization in Hadron Therapy
Authors: Etehadtavakol Mahnaz , Shokrani Parvaneh , Shanei Ahmad
Published: November 2024

Proton therapy is a cancer treatment method that uses high-energy proton beams to target and destroy cancer cells. In recent years, the use of proton therapy in cancer treatment has increased due to its advantages over traditional radiation methods, such as higher accuracy and reduced damage to healthy tissues. For accurate planning and delivery of proton therapy, advanced software tools are needed to model and simulate the interaction between the proton beam and the patient’s body. One of these tools is the Monte Carlo simulation software called Geant4, which provides accurate modeling of physical processes during radiation therapy. The purpose of this study is to investigate the effectiveness of the Geant4 toolbox in proton therapy in the conducted research. This review article searched for published articles between 2002 and 2023 in reputable international databases including Scopus, PubMed, Scholar, Google Web of Science, and ScienceDirect. Geant4 simulations are reliable and accurate and can be used to optimize and evaluate the performance of proton therapy systems. Obtaining some data from experiments carried out in the real world is very effective. This makes it easy to know how close the values obtained from simulations are to the behavior of ions in reality.
Life profile of Chittattinkara N. Krishna Pillai Vaidyan: A genius and compassionate legend of Ayurveda
Authors: Sumedhan Varsha , Thekkekkoottumughath Peethambaran Sinimol
Published: November 2024

Shri Chittattinkara N. Krishna Pillai Vaidyan was an Ayurvedic physician of Thiruvananthapuram, Kerala, India, who started his career in 1948, which continued for nearly 63 years. From childhood onwards, he helped his father to prepare and dispense medicines. He started his clinical practice at his home, which was later developed into the “Lakshmi Narayana Ayurveda Research Center” to train students of Ayurveda. He traveled across the state to collect genuine drugs to prepare medicines authentically. He received the “Vaidyakalanidhi” degree in Ayurveda with top honors from the esteemed Government Ayurveda College in Thiruvananthapuram. He was also a qualified “Netravisharada” specializing in treating Netra Rogas (ophthalmology). He incorporated Rasa (minerals and metals) preparations in his practice and prepared Rasa drugs in his pharmacy with Puta pits (measurement of heat) and other necessary equipment. He was an expert in Nadipareeksha (pulse diagnosis) and diagnosed diseases using traditional Ayurvedic methods. He had mastery over classical Ayurvedic texts and literature, such as the Susrutha Samhita, Charaka Samhita, and Ashtanga Hridaya. As an eminent physician, he successfully treated numerous patients with conditions that modern medicine could not cure. He never charged consultation fees to his patients. He was a socially committed person and was one of the eminent personalities who uplifted the worthiness of Ayurveda throughout his lifetime.
Prof. G Srinivasa Acharya: A guiding light and a skilled practitioner
Authors: Naik Raghavendra , Shubhashree M. N. , Bhat Sulochana
Published: November 2024

This article aims to shed light on the substantial contributions made by renowned visionary Dr. G. Srinivas Acharya in the field of Ayurveda. Dr. Acharya’s journey has been characterized by dedication, hard work, and a relentless pursuit of knowledge. With a strong grounding in Ayurvedic principles, he has been instrumental in bridging the gap between ancient wisdom and modern science. Dr. Acharya’s expertise in treating a wide range of diseases is truly remarkable. From autoimmune disorders to cancer, diabetes, hypertension, arthritis, skin conditions, neurological disorders, stress management, rejuvenation therapies, and more, he has made a lasting impact on the lives of countless patients. His expertise in employing Rasayana Chikitsa for the treatment of challenging cases has been particularly noteworthy. Beyond his clinical practice, his tireless efforts in promoting Ayurveda at international forums and establishing collaborations with leading universities and institutions have played a significant role in raising awareness about this ancient medical system. By sharing his knowledge and inspiring others, he has contributed to the growth and recognition of Ayurveda on a global scale. His dedication to the field of Ayurveda, coupled with his innovative approach and expertise in treatment, has earned him a place of prominence among the visionaries who have dedicated themselves to this ancient science.
Morphological and physiological features of human cerebral cortical astrocytes in regenerative medicine: a narrative review
Authors: Tyurikova Olga
Published: November 2024

Astrocytes are essential for various functions in the brain, including regulating synaptic transmission, maintaining ion homeostasis, and supporting neuronal network activity. Despite over a century of recognition that human astrocytes differ morphologically from those of other mammals, detailed functional studies have been limited due to challenges in obtaining live human brain tissue. This narrative review revisits recent findings on the morphological and physiological properties of human astrocytes, particularly those focusing on cortical astrocytes. I summarize the main anatomical and functional features of the different types of human astrocytes and briefly compare human astrocytes with what is known about astrocytes in mice and/or primates. I greatly summarize the physiological properties of human astrocytes, with emphasis on their intrinsic properties, potassium ion uptake and syncytium connectivity, emphasizing recent advances that have enhanced our understanding of astrocytic functionality in the human brain and their possible role in regenerative medicine.
The role of gut microbiota metabolites in the regeneration and protection of nervous tissue: a narrative review
Authors: Kostiuchenko Olha , Lushnikova Iryna , Skibo Galyna
Published: November 2024

The gut microbiota modulates various physiological functions in the human body, including digestion, immune regulation, gut barrier maintenance, and even nervous system activity. The bidirectional communication between gut microbes and the brain, known as the microbiota–gut–brain axis, is crucial for balanced metabolism. Recent studies have indicated that gut microbiota metabolites, such as short-chain fatty acids, indole derivatives, neurotransmitters, and other bioactive compounds, can positively impact neurogenesis, myelination, and axonal regeneration, suggesting their potential in therapeutic strategies for neuroprotection and neuroregeneration. Despite the growing number of studies on gut microbiota metabolites, understanding their role in neuroprotective mechanisms remains limited. This article reviews the classification, production, functions and therapeutic potential of the most well-known gut microbiota metabolites, as well as their impact on neurogenesis, synaptogenesis, energy metabolism, immune modulation, and blood–brain barrier integrity, which will provide a foundation for the study of gut microbiota metabolites in the field of biomedical engineering.
Advances in stem cell therapy for stroke: mechanisms, challenges, and future directions
Authors: Sheikh Abdullah Md. , Hossain Sayeed , Tabassum Shatera
Published: November 2024

Stroke is a leading cause of morbidity and mortality worldwide. However, there is very limited availability of stroke disease-modifying therapies, necessitating innovative therapeutic strategies to address its complex pathophysiology. The objective of this review is to furnish readers with comprehensive knowledge concerning stem cell research in the context of stroke, delving into promises, limitations, and future research directions that can effectively bridge the gap between bench and clinic in stroke research. The discussion encompasses an exploration of the intricate pathophysiology of stroke and comprehensively examines recent advances in stem cell therapy in the context of stroke pathophysiology. Emphasis is given on elucidating underlying mechanisms, persistent challenges, and promising future directions in stem cell therapy for stroke. Mechanistic insights reveal the diverse roles of stem cells in modulating immune responses, providing trophic support, exerting neuroprotective effects, and facilitating neuronal differentiation. However, challenges such as dosing optimization, immunogenicity, precise timing of interventions, and standardizing the therapy necessitate careful consideration. Future directions in stem cell therapy for stroke encompass precision medicine approaches, cell engineering advancements, synergistic combination therapies, and biomaterial-based delivery systems. Standardized protocols, ethical frameworks, and patient engagement initiatives are crucial for steering the field toward transformative and clinically viable outcomes. The convergence of these advancements positions stem cell therapy as a promising avenue for revolutionizing stroke treatment, offering hope for improved outcomes and quality of life for stroke survivors.
Bladder Preservation with Radiation: An Effective Alternative to Radical Cystectomy
Authors: Saad Ereny , Hoskin Peter , Sangar Vijay K. , Choudhury Ananya
Published: November 2024

Radical treatment of localized disease T2-T4a, N0 muscle invasive bladder cancer (MIBC) is either radical cystectomy with pelvic lymph node dissection or Radiotherapy within bladder preservation approach. The bladder preservation approach involves complete transurethral resection (TUR) followed by neoadjuvant chemotherapy and concurrent radiotherapy (RT) with a radiosensitizer. The better morbidity profile favors RT, both approaches have comparable survival outcomes. The UK attempted to compare surgery with radiation in a randomized study (SPARE), was closed early due to poor recruitment, it was a multicenter feasibility pilot to determine the standard of care in locally advanced bladder cancer was possible.
A Perspective on Breast Cancer in Young Women: Unique Challenges and Opportunities
Authors: Heeling Eva , van der Ploeg Iris M. C. , Peeters Marie-Jeanne T. F. D. Vrancken
Published: November 2024

The management of breast cancer (BC) in young women requires a comprehensive, multidisciplinary approach. There are many knowledge gaps that need to be filled, and it is, therefore, essential to share research and knowledge on an international level to pursue optimal treatment and management strategies for this patient population. This article provides a perspective on BC in young women, highlighting the unique challenges and opportunities for these women.
Breast Cancer in Young African Women: Unique Challenges and Perspectives
Authors: Roodt Liana , Malherbe Francois
Published: November 2024

Breast cancer (BC) in young women is difficult to treat, especially in Africa. This review discusses the gaps and frustrations clinicians face in South Africa and the broader sub-Saharan region. It provides a snapshot of the literature concerning young BC patients and their unique challenges, including age, ancestry, barriers to care, fertility and ovarian preservation options, access to genetic testing and counseling, clinician knowledge and attitudes and specific molecular subtypes. In addition, the review includes insights from specialist oncology surgeons working in the South African public and private healthcare sectors and calls for advocacy. There is an urgent need for multilayered systemic change in the care of young BC patients in sub-Saharan Africa to address the tragic reality of clinicians being unable to offer them the care they deserve.
Breaking the Silence: Understanding and Addressing Psychological Trauma in Adolescents and Young Adults with Breast Cancer
Authors: Saxena Vartika , Jain Vama , Das Amity , Huda Farhanul
Published: November 2024

Among women, breast cancer (BC) is the most common cancer, which is on the rise annually. While it mainly affects women over 50 years of age, 4% of cases occur in those aged 15–39 years. BC in adolescents and young adults (AYAs) is a global concern, ranking the highest in both incidence and mortality, with 246,036 new cases reported in 2022. AYAs often face lower survival rates and poorer prognosis compared to older women. BC diagnosis has emotional impacts, including anxiety, despair, and fear, with AYAs experiencing higher distress levels than older patients. Unique challenges for young women include fertility concerns, career disruptions, financial difficulties, and body image issues. Risk factors for distress include lower social support, unmet needs, and lack of psychological support. AYAs with BC face increased risk of posttraumatic stress disorder, exacerbated by the significant psychosocial distress of their illness. Addressing psychological distress in patients with BC involves social support groups, spirituality-based coping, meditation activities, resilience approaches, and multidisciplinary care. This holistic approach can enhance patient outcomes and well-being.
Drug classification system based on drug composition and usage instructions
Authors: Vu Hoang-Dieu , Pham Vu-Hien , Le Quang-Dung
Published: November 2024

This study presents a natural language processing (NLP) approach to classify drugs based on compositional and usage descriptions. NLP techniques including text preprocessing, word embedding, and deep learning models were applied to a Vietnamese drug dataset. Traditional machine learning models like Support Vector Machines (SVM) and deep models including Bidirectional Long Short-Term Memory (BiLSTM) and PhoBERT were evaluated. Besides, since there is a limitation in the information of our own collected data, some data augmentation techniques were applied to increase the variation of the dataset. Results show PhoBERT achieving 95% accuracy, highlighting the benefits of transferring knowledge from large language models. Errors primarily occurred between similar drug categories, suggesting taxonomy refinement could improve performance. In summary, an automated drug classification framework was developed leveraging state-of- the-art NLP, validating the feasibility of analyzing drug data at scale and aiding therapeutic understanding. This supports NLP’s potential in pharmacovigilance applications.
Random walks on direct products of groups
Authors: Golsefidy Alireza Salehi , Srinivas Srivatsa
Published: November 2024

Suppose

\operatorname{SL}_{2}(\mathbb{F}_{p})\times \operatorname{SL}_{2}(\mathbb{F}_{p})

is generated by a symmetric set

S

of cardinality

n

where

p

is a prime number. Suppose the Cheeger constants of the Cayley graphs of

\operatorname{SL}_{2}(\mathbb{F}_{p})

with respect to

\pi_{L}(S)

and

\pi_{R}(S)

are at least

c_{0}

, where

\pi_{L}

and

\pi_{R}

are the projections to the left and the right components of

\operatorname{SL}_{2}(\mathbb{F}_{p})\times \operatorname{SL}_{2}(\mathbb{F}_{p})

, respectively. Then the Cheeger constant of the Cayley graph of

\operatorname{SL}_{2}(\mathbb{F}_{p})\times \operatorname{SL}_{2}(\mathbb{F}_{p})

with respect to

S

is at least

c

where

c

is a positive number which only depends on

n

and

c_{0}

. This gives an affirmative answer to a question of Lindenstrauss and Varjú.
Counting Divisorial Contractions with Centre a $cA_{n}$-Singularity
Authors: Paemurru Erik
Published: November 2024

First, we simplify the existing classification due to Kawakita and Yamamoto of

3

-dimensional divisorial contractions with centre a

cA_{n}

-singularity, also called a compound

A_{n}

singularity. Next, we describe the global algebraic divisorial contractions corresponding to a given local analytic equivalence class of divisorial contractions with centre a point. Finally, we consider divisorial contractions of discrepancy at least 2 to a fixed variety with centre a

cA_{n}

-singularity. We show that if there exists one such divisorial contraction, then there exist uncountably many such divisorial contractions.
On the Geography of Slopes of Fibrations
Authors: Liu Xiao-Lei , Lu Jun
Published: November 2024

The slopes of fibrations of genus

g\geq2

have strict lower (resp., upper) bound, namely

\lambda_{m}(g)

(resp.,

\lambda_{M}(g)

). In this paper, we show that if

g\neq3

, then each rational number

r\in [\lambda_{m}(g),\lambda_{M}(g)]

can occur as the slope of some fibration of genus

g

. A similar result is also true for

g=3

and

r\in [\lambda_{m}(3),9]

.
Empowerment of Kelompok Wanita Tani (KWT) Amanah, Sidomulyo in Ecoprint Making
Authors: Aji Oktira Roka , Pratiwi Ambar , Irsalinda Nursyiva
Published: November 2024

Sidomulyo Village, situated in Bantul Regency, Indonesia, is confronted with economic challenges, particularly among its predominantly female population who face limited educational and economic opportunities. Recognizing the village's abundant natural resources, this community service program facilitated by Kelompok Wanita Tani (KWT) Amanah aimed to empower local women through ecoprint batik making. The program focused on equipping participants with skills in ecoprint techniques using locally sourced plant materials. Through stages of socialization, training, mentoring, and evaluation, the participants learned to create vibrant fabric patterns without chemical dyes, promoting environmental sustainability and preserving local biodiversity. Positive feedback highlighted the program's effectiveness in enhancing participants' skills and knowledge, with a strong interest shown in further developing ecoprinting skills and exploring entrepreneurial opportunities, including online marketing. This study underscores the transformative impact of community-based initiatives in promoting women's economic independence and sustainable development through traditional craft practices.
Circular Economy Education Through Food Preparation as an Effort to Reduce Food Waste and Strengthen the Family Economy
Authors: Suasih Ni Nyoman Reni , Saskara Ida Ayu Nyoman , Dewi Made Heny Urmila , Purwanti Putu Ayu Pramitha , Tisnawati Ni Made , Saskara Ida AyuGde Dyastari , Saraswati I Gusti Ayu Prili
Published: November 2024

Circular economy literacy efforts are important considering that the waste awareness index in Indonesia is still worrying. If we look at the data from the National Waste Management Information System (SIPSN), food waste dominates the composition of waste based on waste type, namely 40.2 percent. When looking at the source, it is known that households are the largest source of waste (38.3 percent). Considering these data and facts, preventive efforts need to be carried out at the household level, especially regarding food waste. This activity aims to provide education for mothers regarding the circular economy and food waste behavior to minimize food waste, especially in its preparation or better known as food preparation. It is also believed that this effort will have a positive impact on the family's economy. This activity is carried out through the outreach method, and is also accompanied by a pre-test and post-test as a form of evaluation. The locus of the activity will be carried out in Batuan Village, Sukawati District, Gianyar Regency, targeting the local village PKK (family welfare empowerment) team. The aim is that information and activity materials can be distributed and implemented widely. After comparing the results of the pre-test and post-test, it was discovered that there had been an increase in service participants' understanding of the circular economy and food preparation. It is certainly important to continue this activity, one of which is through assistance in preparing circular economy programs through the PKK.
Ampliando o Espectro da Cefaleia Hípnica: Um Estudo de Coorte Retrospetivo
Authors: Dourado Sotero Filipa , Leal Rato Miguel , Pavão Martins Isabel
Published: November 2024

Introdução: A cefaleia hípnica é uma entidade rara que requer crises estritamente relacionados ao sono. Contudo, existem doentes com cefaleias noturnas recorrentes que apresentam ocasionais crises em vigília e que são excluídos desse diagnóstico.
O nosso objetivo foi comparar esses dois grupos de doentes e compreender se as suas diferenças justificam um diagnóstico distinto.

Métodos: Trata-se de um estudo de coorte retrospetivo, comparativo, entre doentes com cefaleia recorrente predominantemente noturna (≥80% das crises) (PNRH) e cefaleia hípnica (HH) seguidos numa clínica terciária de cefaleias.

Resultados: Foram incluídos 31 doentes (83,9% mulheres), dos quais 13 com PNRH e 18 HH (13 casos com HH provável e 5 HH definitiva). Não houve diferenças significativas entre os grupos quer na demografia quer nas características da dor e resposta ao tratamento. Ambos tinham uma frequência elevada (71%) de crises prévias de enxaqueca e 51,7% preenchiam os critérios para uso excessivo de medicamentos.

Conclusão: Estes resultados sugerem que existe uma sobreposição entre a cefaleia hípnica e a cefaleia recorrente predominantemente noturna. Ambas podem evoluir a partir de enxaqueca. Embora a sua fisiopatologia permaneça desconhecida, a cefaleia noturna recorrente pode ser outra forma provável de cefaleia hípnica.
Efeitos da comercialização na expansão do Ensino Superior Privado brasileiro em comparação ao sul coreano
Authors: Lopes Ferreira Sergio Moreno , Sindeaux Roney Versiani
Published: November 2024

Este artigo explora as divergências na mercantilização do ensino superior no Brasil e na Coreia do Sul, com foco na criação de instituições privadas de ensino superior em ambos os países e suas implicações na qualidade educacional e oferta de mão de obra. A análise busca compreender o crescimento de um país emergente (Brasil) em contraste com uma nação reconhecida por seu excelente sistema educacional. Discute-se que a Coreia do Sul apresenta uma proporção maior de graduados e menores taxas de desemprego, especialmente entre os com diploma universitário, em virtude de políticas governamentais bem-sucedidas que incentivaram a educação e a capacitação profissional.
Tool Wear Prediction Combining Global Feature Attention and Long Short-Term Memory Network
Authors: Wanzhen Wang  , Sze Song Ngu  , Miaomiao Xin  , Xiaomei Ni  , Beibei Kong  , Kaiyuan Wu  , Ruyue Han
Published: November 2024

This study aims to accurately predict tool flank wear in milling and simplify the complexity of feature selection. A hybrid approach is proposed to eclectically integrate the advantages between the long short-term memory (LSTM) network and the global feature attention (GFA) module. First, the feature matrix is calculated using the multi-domain feature extraction method. Subsequently, a parallel network is employed to achieve feature fusion. The stacked LSTM network extracts the temporal dependencies between features and the GFA module is used to adaptively complement key features representing global information of samples. Finally, the output features are concatenated, and tool wear prediction is achieved through a fully connected layer. Experiments demonstrate the optimal performance in predicting tool flank wear. Specifically, using the proposed GFA-LSTM framework reduces the mean absolute error (MAE) by 36.9%, 17.7%, and 25.2% in three experiments compared to the simple LSTM, validating the effectiveness of the proposed method.
Affective neuroscience. Emotion from “basic emotion” approach
Authors: POSTOLACHE Ovidiu Mihail
Published: November 2024

The emotional experience that accompanies us in experiencing life has caused numerous controversies due to the subjectivity of this experience, so that currently there is no scientific consensus on the place it occupies in psychic life, its nature, as well as the mechanism of production. Affective neuroscience has sought and provided an answer to these challenges by outlining a theory of personality from a bottom-up perspective, identifying seven primary emotional systems specific to the mammalian brain that originate in subcortical structures. The identification of these emotional systems was possible through the use of electrical stimulation techniques, pharmacological manipulation as well as studying the lesions caused at the animal brain level. The proposed vision in which emotion is seen from a categorical perspective, is a monistic one of the classic brain-mind duality, intending a new perspective in which the intrinsic aspect of the brain in certain mental contents is taken into account. This article provides an overview of this paradigm in which emotions originate in primary emotional systems determined by the process of evolution with a role for survival.
The impact of laedership styles on organizational effectiveness in the context of education: an interdisciplinary analysis
Authors: CHIRICA Florentina Simona
Published: November 2024

This study investigates the impact of different leadership styles on organizational effectiveness in the field of education, focusing on the integration of an interdisciplinary approach. By using a mixed-methods research design, we aim to assess teachers' and students' perceptions of school leadership styles and identify their relationships with satisfaction levels. Preliminary findings reveal a significant correlation between certain leadership styles and the satisfaction levels of both teachers and students, as well as an association with aspects of organizational climate and student academic performance. This research provides valuable insights into the importance of effective management in educational institutions and the adaptation of leadership styles to enhance organizational outcomes.
Correlation between metacognition, attitude and the academic success of physics students in the 7th grade
Authors: CALALB Mihail , DABIJA Viorel
Published: November 2024

In the present paper, the correlation between metacognition, attitude and the academic success of 7th grade students in physics is analyzed. For this purpose, the academic success was measured through assessment tests, and attitude and metacognition through a 30-item questionnaire completed by students. The structure of this questionnaire and the statistical analysis of the results of the questioning and the assessment tests are presented. It was obtained that the value of the linear regression coefficient for the correlation between metacognition – academic success is 0.256, attitude – academic success is 0.234, for metacognition – attitude is 0.534. This means that if we achieve an increase in metacognition by one unit on the Likert scale, then we could achieve an increase in academic success by a fourth, that is, a student graded with ”eight” mark will become a ten mark student. Similarly, a one-unit increase in attitude on the Likert scale will translate into a 23% increase in academic achievement. Also, metacognition and attitude influence each other quite strongly – over 50% of one dimension is influenced by the other dimension.
THE USE OF RECLOSERS IN SWITCHGEARS AS AN ALTERNATIVE TO CLASSICAL SOLUTIONS FOR IMPROVING THE SHAPE OF MEDIUM VOLTAGE NETWORK
Authors:   Elektrodistribucija Srbije doo Beograd, Sarić Srbislav , Sarić Biljana ,   Elektrodistribucija Srbije doo Beograd
Published: November 2024

This paper presents variant solutions for transitioning the substation (SS) 35/10 kV into a 20 kV switchgear with the use of reclosers. In “Elektrodistribucija Srbije” (Electricity Distribution Company of Serbia, EDS), in addition to circuit breakers, disconnectors and switch-disconnectors, reclosers and sectioners are used as basic switching devices. Thanks to their use in the distribution network, the reliability of power supply to the customers has increased significantly. Reclosers, with their technical characteristics, can be used much more in the electric power distribution system. With the appearance of reclosers and sectioners, new possibilities emerged for the improvement in re-shaping the medium voltage network. If it is taken into account that in the consumption area of the distribution area of Novi Sad there are dozens of SS 35/10 kV, older than 55 years on average, and which are gradually being shut down because the voltage levels of 35 kV and 10 kV are being abandon and replaced by 20 kV voltage level, then the possibility of reclosers’ use has increased significantly. The paper presents two variants of solutions for the transition of SS 35/10 kV "Kuzmin" in the area of the “Elektrodistribucija Sremska Mitrovica” Branch, into a 20 kV switchgear. Also, the paper analyzes the criteria of the influence on the choice of the future solution (financial, operational, planning). The authors of the paper hope that the proposed variant solutions, as well as a number of other facts presented in this paper, can be a good basis for solving the same or similar problems in the consumption area of EDS.
FAILURES OF ON-LOAD TAP CHANGERS
Authors:   Elektrodistribucija Srbije – Tehnički centar Novi Sad, Srbija, Filipović Goran , Antonić Aleksandar ,   Elektrodistribucija Srbije – Tehnički centar Novi Sad, Srbija, Spremić Siniša ,   Elektrodistribucija Srbije – Tehnički centar Novi Sad, Srbija
Published: November 2024

The On-Load Tap changer with associated motor drive unit is a demanding device for maintenance. Despite regular revisions and overhauls with the replacement of parts in the diverter switch of the On-Load Tap Changer, as they age, malfunctions occur more often on the On-Load Tap Changers and on the motor drive units of the On-Load Tap Changers. In motor drive units of On-Load Tap Changers, parts are generally changed only when necessary, i.e. after a detected malfunction in the motor drive unit. The paper describes the failures of the On-Load Tap Changers. Several special cases of failures in the switching part of the On-Load Tap Changers are discussed in more detail with photographs showing the location of the failure. The results of dissolved gas analysis are presented. In the conclusion, a further way of carrying out the maintenance of On-Load Tap Changers and motor drives is proposed.
THERMAL MONITORING OF LIQUID IMMERSED POWER TRANSFORMERS BASED ON DETAILED DYNAMIC THERMAL-HYDRAULIC MODEL
Authors:   Univerzitet u Beogradu, Elektrotehnički fakultet, Srbija, Novković Marko , Picher Patrick ,   Institut de recherche d'Hydro-Québec: Varennes, QC, CA, Torriano Federico ,   Institut de recherche d'Hydro-Québec: Varennes, QC, CA, Radaković Zoran ,   Univerzitet u Beogradu, Elektrotehnički fakultet, Srbija
Published: November 2024

The substantial mass and consequent thermal inertia of liquid immersed power transformers (LIPT) make it feasible to load them over nameplate rating. This possibility is considered in IEC standard 60076-7. This is of interest during short-time cyclic overloading or short-time emergency loading in the event of power network element outages. It is imperative to prevent exceeding critical temperatures in different parts of the transformer to prevent sudden failures caused by bubbling phenomena or accelerated ageing. To ensure safe loading over nameplate rating, it is necessary to calculate the characteristic temperatures during transient thermal processes. Currently, ordinary differential equations are widely used to build dynamic thermal models, employing either standard or experimentally determined parameters in the models. The alternative approach is to use a detailed dynamic thermal hydraulic network model (THNM), which relies on a comprehensive description of the physical phenomena. Unlike computational fluid dynamics (CFD) calculations, the necessary computational resources render this method applicable in real-time applications. Consequently, a detailed dynamic THNM emerges as an optimal solution in developing a real-time applicable transformer digital twin, affording a high-fidelity virtual replica of the transformer’s thermal behavior. The prevalence of detailed static THNM is on the rise in transformer design engineering practices, applicable to transformers constructed with conventional or emerging insulating materials. In contrast, dynamic THNM is still at an earlier stages of technology development. Realistic expectation is that its application will grow and complement or even replace simplified equations of lower accuracy. A final effect is an improvement of LIPT load ability, with minimum failure risk caused by overheating during increased load. The paper presents the basics of this advancement and showcases its application on a 66 MVA three-phase transformer and a 370 MVA single-phase transformer, both ONAF cooled.
GROUNDING OF A HIGH VOLTAGE SUBSTATION IN UNFAVORABLE CONDITIONS
Authors:   Faculty of Technical Sciences, Bitola, Republic of North Macedonia, Popovski Pande , Veljanovski Goran ,   Faculty of Technical Sciences, Bitola, Republic of North Macedonia, Acevski Nikolche ,   Faculty of Technical Sciences, Bitola, Republic of North Macedonia, Atanasovski Metodija ,   Faculty of Technical Sciences, Bitola, Republic of North Macedonia
Published: November 2024

The goal of the paper is to give a detailed overview of the process of planning the grounding of a high voltage (HV) substation in unfavorable conditions. More specifically, the paper covers the foundations of designing a ground grid for all types of HV substations, the process of defining the form of the ground grid, the calculation of the grounding resistivity, as well as calculating the maximum touch and step voltages that occur in different situations. The ground grid of the substation is designed using an application developed in the programming platform MATLAB, which shows a three-dimensional representation of the ground grid, and a visual representation of the results. In addition to the ground grid, the grounding system of the substation foundation, the cable connection, and the grounding system of a neighboring substation are taken into consideration when designing the system. The cables connecting the two substations have a conductive screen with a small reduction factor, which as a result of the potential drain from the conductive screen, contributes to the reduction of the touch and step voltages of the observed substation. A smaller reduction factor results in increased potential drain via the conductive screen. The system is designed in sub-optimal conditions. On one side of the planned substation there is an existing building owned by the utility company that will own the substation as well, and on the other side an embassy is situated. This topology prevents the construction of the grounding grid in a conventional way, the reason being that the substation would be very close to the embassy. The situation requires taking an unconventional approach, while taking into consideration that the maximum tolerable grounding resistivity, touch and step voltage should not be crossed.
ANALYSIS OF UNCERTAINTY SOURCES IN DOSE MEASUREMENT AT AN INDUSTRIAL ELECTRON ACCELERATOR
Authors: Pomatsalyuk R.I. , Romanovsky S.K. , Shevchenko V.O. , Titov V.Yu. , Titov D.V. , Uvarov V.L.
Published: November 2024

The procedure for in-situ/in-plant calibration of routine dosimeters used to support the product processing at the LU-10 industrial electron linac of NSC KIPT is described. The standard polystyrene calorimeters are used as reference dosimeters. The uncertainty budget for dose measurements with the Harwell Red Perspex 4034 routine dosimeters has been compiled. Based on the analysis of numerous measurements of absorbed dose using polystyrene calorimeters, the changes in their metrological characteristics have been observed related both to the duration of their use and the amount of absorbed dose accumulated over that period. The data obtained confirm the need for recalibrating reference dosimeters by an accredited calibration lab, as well as the importance of participating in the dosimetry intercomparisons, including those conducted under the IAEA projects.
Pengaruh Rekrutmen, Pelatihan dan Lingkungan Kerja terhadap Kinerja Karyawan pada PT Dunkindo Cipta Rasa Surabaya
Authors: Oktabriana Pandu Hardianika , Siswati Endang , Iman Nurul
Published: November 2024

Penelitian ini dilakukan dengan mencari tahu dampak yang diberikan oleh  Rekrutmen, Pelatihan, dan Lingkungan Kerja terhadap Kinerja Karyawan di PT Dunkindo Cipta Rasa Surabaya. Populasi penelitian mencakup seluruh karyawan PT Dunkindo Cipta Rasa Surabaya, dengan sampel yang diambil menggunakan teknik sampling jenuh yang melibatkan 96 responden. Metode penelitian yang digunakan adalah deskriptif dengan analisis kuantitatif, menggunakan data primer dan sekunder yang diperoleh melalui penelitian dokumen dan penyebaran kuesioner yang diukur dengan skala Likert. Data diolah menggunakan teknik analisis regresi linier berganda. Hasil penelitian menunjukkan bahwa Rekrutmen, Pelatihan, dan Lingkungan Kerja berpengaruh signifikan terhadap Kinerja Karyawan di PT Dunkindo Cipta Rasa Surabaya, dengan Lingkungan Kerja sebagai variabel yang paling dominan.
Pengaruh Strategi Promosi Online Melalui Media Sosial Instagram dalam Menarik Minat Komsumen pada Salon After Limit Beauty Sidoarjo
Authors: Syifa Rosyidah Lailatus , Widiana Muslichah Erma , Negoro RM Bramastyo Kusumo
Published: November 2024

Penelitian ini bertujuan untuk menganalisis pengaruh strategi promosi online melalui Instagram dalam menarik minat konsumen pada Salon After Limit Beauty di Sidoarjo. Metode penelitian menggunakan pendekatan kuantitatif, dengan data dikumpulkan melalui kuesioner online. Responden dalam penelitian ini adalah konsumen yang pernah menggunakan layanan salon tersebut, dengan total 100 responden. Data yang diperoleh dianalisis menggunakan uji validitas dan reliabilitas, diikuti oleh analisis regresi linier berganda serta uji hipotesis menggunakan uji F dan uji t. Hasil penelitian menunjukkan bahwa promosi online melalui Instagram berpengaruh baik secara simultan maupun parsial terhadap minat konsumen. Variabel Instagram juga terbukti memiliki pengaruh paling dominan terhadap minat konsumen di salon tersebut. Oleh karena itu, perusahaan perlu memaksimalkan penggunaan Instagram, seperti memberikan informasi terperinci terkait treatment, bekerja sama dengan influencer atau endorsement, dan membuat konten kreatif secara konsisten untuk menjangkau audiens yang lebih luas.
Воссоздание мерной иконы Петра I: история уникального проекта
Authors: М. О. Логунова
Published: November 2024

Мерные иконы были очень популярны в царской семье в XVI–XVIII вв. В настоящее время традиция писания мерных икон для младенцев возрождается. Статья посвящена уникальному проекту Государственного музея истории Санкт-Петербурга по воссозданию и возвращению на историческое место мерной иконы Петра I, являвшейся элементом мемориала у могилы императора в Петропавловском соборе, но впоследствии утраченной.

Measured icons were very popular in the royal family in the 16th-18th centuries. Currently, the tradition of painting dimensional icons for babies is being revived. The article is devoted to the unique project of the State Museum of St. Petersburg History to recreate and return to its historical place Peter I’s measured icon, which was an element at the emperor’s tomb memorial in the Peter and Paul Cathedral, but was subsequently lost.
Традиция «метафизического персонализма» в формировании национального самосознания молодого поколения России
Authors: Г. В. Скотникова
Published: November 2024

Статья фиксирует внимание на особом значении философии для русского человека, его проникнутости интересом самосознания, ценностью духовного мира, «внутреннего сокровища духа» (Н. Я. Данилевский). Вместе с тем в настоящее время проблема состоит в том, что при наличии метафизических потребностей в обществе отсутствует метафизическая почва. Это противоречие отчетливо выявило актуальность задачи формирования элементарной философской культуры в русском национальном духе. Краеугольные камни, заложенные на пути ее решения, автор видит в работах петербургского философа Н. П. Ильина (1947–2023), прежде всего в его фундаментальном исследовании «Трагедия русской философии».

The article draws attention to the special importance of philosophy for the Russian person, his permeation with the interest of self-awareness, spiritual world, “the inner treasure of the spirit” (N. Ya. Danilevsky). At the same time, the current problem is that while there are metaphysical needs in society, there is no metaphysical soil. This contradiction clearly revealed the relevance of the task of forming an elementary philosophical culture in Russian national spirit. The author sees the cornerstones laid on the path to its solution in the works of the St. Petersburg philosopher N. P. Ilyin (1947–2023), primarily in his fundamental study “The Tragedy of Russian Philosophy”.
“Сonsulere subditis placet”: иерархические отношения между Римcким папой и епископами церковных провинций патриархата Запада по посланиям свт. Льва Великого Анастасию, епископу Фессалоникийскому
Authors: К. Г. Маркович
Published: November 2024

Статья написана в продолжение экклезиологического дискурса, начатого в предыдущей статье «Princeps apostolorum — princeps Ecclesiae. Петрово первенство и авторитет (auctoritas) Римского епископа в учении и практике свт. Льва Великого»1 . В ней подвергалась сомнению справедливость широко распространенного в церковно-исторической науке и патрологии суждения о том, что свт. Лев Великий, епископ Рима с 440 по 461 гг., был апологетом учения об монархическом первенстве власти Римского епископа во Вселенской Церкви, в котором оно существует в Римско-Католической Церкви. В настоящей статье на основе анализа содержания канонических посланий (декреталий), направленных свт. Львом своему викарию в Восточном Иллирике митрополиту Фессалоникийскому Анастасию и подчиненным ему епископам, показаны экклезиологические принципы, которыми руководствовался свт. Лев, как патриарх Запада, выстраивая иерархические отношения с епископами, состоявшими в его патриаршей юрисдикции. Из них следует, что свт. Лев был убежден, что его забота (cura) и попечение (sollicitudo), как «наследника апостола Петра» и первенствующего епископа Вселенской Церкви заключается в охранении канонического порядка в Церкви и разрешении наиболее важных или сложных судебных дел и конфликтов (causae majores).

The article was written in continuation of the ecclesiological discourse begun in the previous article “Princeps apostolorum — princeps Ecclesiae. Petrine primacy and authority (auctoritas) of the Bishop of Rome in the teaching and practice of St. Leo the Great». It questioned the validity of the widespread judgment in Church history and patrolology that St. Leo the Great, Bishop of Rome from 440 to 461, was an apologist for the doctrine of monarchical primacy of the Roman Bishop in the Universal Church, which exists in the Roman Catholic Church. This article, basing on an analysis of the content of the canonical messages (decretals) sent to St. Leo to his vicar in Eastern Illyricum, Metropolitan Anastasius of Thessaloniki and the bishops subordinate to him, shows ecclesiological principles that guided St. Leo, as the Patriarch of the West, in building hierarchical relationships with the bishops who were in his patriarchal jurisdiction. It follows from them that St. Leo was convinced that his care (cura) and solicitude (sollicitudo), as the “heir of the Apostle Peter” and the first bishop of the Universal Church, was to preserve canonical order in the Church and to resolve the most important or complex legal cases and conflicts (causae majores).
Perencanaan Perawatan Pada Mesin Crimping Manual Tipe 30 Dengan Metode RCM di Perusahaan Otomotif
Authors: Andrianto Mochammad , Sujatmiko Agus , Firmansyah Hilmi
Published: November 2024

Perusahaan Otomotif merupakan perusahaan manufaktur yang bergerak memproduksi komponen otomotif salah satunya wairing hardness. Di perusahaan ini terdapat beberapa alat yang salah satunya yaitu mesin Crimping Manual Tipe 30. Dalam proses produksi, mesin Crimping Manual Tipe 30 mesin beroperasi cukup lama sehingga kerusakan dan kendala memungkin bisa terjadi setiap saat pada mesin ini. Dalam penelitian ini akan dilakukan “Analisis Perawatan Pada Mesin Crimping Manual Tipe 30 Dengan Metode Reliability Centered Maintenance di Perusahaan Otomotif”. Tujuan penelitian ini menentukan komponen kritis, nilai keandalan, dan interval perawatan. Berdasarkan pengumpulan, pengolahan, dan pembahasan data yang telah dilakukan maka di dapatkan hasil 2 komponen kritis dari mesin Crimping Manual Tipe 30 yaitu tooling part set dengan nilai keandalan 0,938, dan  Motor mesin Crimping Manual Tipe 30 dengan nilai keandalan 0,972. Diharapkan adanya perawatan dengan menggunakan metode Reliability Centered Maintenance pada perusahaan otomotif ini dapat mengurangi downtime yang dialami pada mesin sehingga dapat beroperasi dengan optimal.