bluuebunny/crossref_metadata_2025 huggingface dataset:
The effect of eight weeks of high intensity interval training (HIIT) on the content of mitochondrial fission and fusion proteins in the left ventricle of old rats
Authors: Marezloo Mahdi , Bahmanbeglou Neda Aghaei , Pahlavani Hamed Alizadeh , Asgharpour Habib
Published: December 2024

Introduction: As individual grow older, the likelihood of developing cardiovascular diseases increases significantly. Currently, high-intensity interval training (HIIT) is regarded as a strategy for exercise to improve heart disease. Consequently, the aim of this research was to investigate the impact of eight weeks of HIIT on the levels of PINK1 and PARKIN proteins in the left ventricle of aged rats.
Methods: The present research was of an experimental type and involved twelve male rats, each 20 months old, with an average weight of 400 ± 30 grams. The rats were randomly divided into HIIT and control groups (each group had 6 rats).
The HIIT program consisted of high-intensity bouts of 85-95% of maximum speed (m/min) and active rest periods with an intensity of 40-55% of maximum speed (m/min) during each weekly session. Following a 48-hour period post the most recent training session, the rats were subjected to anaesthesia through the administration of Ketamine and Xylazine.  Subsequently, the left ventricle of the heart was excised, and the various parameters were measured utilizing the western blot laboratory technique. Data were analysed using the Shapiro-Wilk test and independent t-test conducted within SPSS16. A significance threshold of P≥0.05 was considered for this analysis.
Results: Eight weeks of HIIT caused a significant increase in PINK1 (P=0.02) and PARKIN (P=0.004) protein levels in the left ventricle of aged rats, in comparison to the control group.
Conclusion: It seems that HIIT may influence the quality of mitochondria within the left ventricle of the hearts of aged rats, indicating potential implications for health-related applications.
Investigation of Kidney Histopathology in Rats Receiving Methamphetamine Simultaneously with Berberine Hydrochloride and Aerobic Exercise
Authors: Naghipour Danial , Arminfar Aref , Sahraneshin Samani Zahra , Sepanloo Lida , Babaei Hessamedin , Hasani Mohammad Hossein , Yahyaei Behrooz
Published: December 2024

Introduction: Given the widespread issue of methamphetamine addiction and its damaging effects, coupled with the crucial role of the kidneys in maintaining bodily equilibrium, we chose to undertake this study.
Methods: Forty rats were randomly divided into five equal groups: control, methamphetamine, methamphetamine with exercise, methamphetamine with berberine hydrochloride, and methamphetamine with both exercise and berberine hydrochloride. The administration of methamphetamine at a dose of 15 mg/kg intraperitoneally for a duration of 4 days every 12 hours and berberine hydrochloride 100 mg/kg intraperitoneally for a duration of 4 weeks daily has been conducted. Aerobic exercise was performed in the form of running on a rodent treadmill for 8 weeks with moderate intensity. Twenty-four hours following the final exercise and administration of berberine hydrochloride, kidney tissue was extracted and examined under a light microscope, in accordance with the ethics committee's guidelines.
Results: In the methamphetamine group, the glomerulus diameter decreased, hyperemia and tissue disorganization occurred, and the cells of the proximal and distal convoluted tubules were atrophied. In the methamphetamine group, with exercise, there was a decrease in diameter in some glomeruli and changes in hyperemia and an increase in the diameter of blood vessels. In the group treated with methamphetamine and berberine hydrochloride, there was a noted shrinkage of glomeruli and an increase in urinary space. In the group receiving methamphetamine, exercise, and berberine hydrochloride, the quantity and size of glomeruli as well as  the spaces between them, were normal and without irregularities.
Conclusion: This research demonstrated that both aerobic exercise and berberine hydrochloride can mitigate the damaging histopathological impacts of methamphetamine on the kidney, indicating that their simultaneous use may offer enhanced protective benefits. effect
Formation and Prevention of Natural Gas Hydrates
Authors: Chu Yuekang
Published: December 2024

Natural gas hydrate is formed under certain temperatures and pressures, which makes it an unavailable clean energy source. However, in industrial production, clogging occurring due to hydrate generation can cause a series of safety accidents and economic losses. In order to solve the hazards of natural gas hydrates in drilling, this paper reviews the formation conditions of natural gas hydrates and the prevention and control measures. In order to inhibit the formation of hydrates, the use of traditional well control measures and the addition of thermodynamic inhibitors have high costs, large dosages, an unfriendly environment, etc. The new type of kinetic inhibitor has a strong effect and low dosage and is considered to be the most promising chemical treatment for hydrate prevention and control in the industry. However, kinetic inhibitors are greatly affected by environmental factors, and compounding them with thermodynamic inhibitors and their synergistic effect can greatly reduce the dosage of thermodynamic inhibitors and improve inhibition performance. It is an important direction for laboratory research and has shown good results in field applications.
Regulations in Mixed Marriage: A Comparative Review Between the Marriage Legal System In Indonesia and the Marriage Legal System in Nigeria
Authors: Haq Auralia Marsella Zhaneta , Sewu Pan Lindawaty Suherman
Published: December 2024

According to Law Number 1 of 1974, a marriage is considered valid as long as it is carried out in accordance with religion or belief. Marriage is a physical and spiritual bond between a man and a woman as husband and wife with the aim of forming a happy and eternal family based on God Almighty. Mixed marriage is a marriage between two people who are subject to different laws due to differences in citizenship. This study uses a normative legal research approach that utilizes primary and secondary legal materials in its analysis so that the legal data used is secondary data or data that is not obtained directly such as law books, academic journals, and official documents. This study aims to analyze mixed marriages between Indonesian citizens and foreign citizens according to Law Number 1 of 1974 concerning Marriage and the marriage laws in force in Nigeria.
Influence of Innovation Orientation on Performance of Non-Life Insurance in Kenya
Authors: Akwir Birian Nungo , Oloko Margret , Juma Dr. Dennis
Published: December 2024

The insurance industry plays crucial role in the social and economic development of every economy. However, the non-life insurance sub-sector in Kenya has had performance downturn in the past ten years. This study sought to examine the effect of innovation orientation on the performance of non-life insurance in Kenya. The study was anchored on the Schumpeter’s theory. The target population of the study was 35 non-life insurance companies licensed by the insurance regulatory authority and members of the association of Kenya insurers. The study adopted survey research design and used questionnaires to collect primary data. A pilot study was done to test the reliability and validity of the research instrument. The study used Cronbach’s alpha (α) coefficient to test reliability, while construct and content validity were used to check the validity of the research instrument. The data was analyzed using quantitative and qualitative analysis statistics with the help of SSPS version 24. The study used correlation analysis, regression analysis and analysis of variance (ANOVA) to establish the relationship between the variables, strength and direction of the variables and to test hypotheses. The results were presented in tables and models. The study revealed that innovation orientation significantly influenced the performance of non-life insurance companies in Kenya. This meant that non-life insurance companies that prioritize innovation in their products, services, and processes are likely to achieve better performance outcomes. Given the significant impact of innovation orientation on performance, non-life companies should allocate more resources on research to increase gross written premium, insurance penetration and improve underwriting profits. The study recommends future research in other financial services sectors to establish the role of innovation orientation on performance of those sectors. The study focused on non-life insurance in Kenya which limits its application to a fast growing sub-sector of micro-insurance and recommends that a study be conducted on micro-insurance. The findings of such a study may be useful in aiding review of insurance regulations and policy
Principle of intravenous fluid therapy in the neurocritically ill patients
Authors: Ko Sang-Bae
Published: December 2024

Intravenous fluid therapy is a fundamental treatment in intensive care units (ICUs). Although most clinical trials have focused on patients requiring active resuscitation of the intravascular volume, such as those experiencing shock or sepsis, neurocritically ill patients may also benefit from intravenous fluid therapy during crises involving elevated intracranial pressure or reduced cerebral perfusion pressure. This review provides a comprehensive history of the evolution of intravenous fluid therapy, highlighting the development of crystalloids and the challenges associated with colloids. Previously favored for their theoretical advantages in sustaining intravascular volume, colloids have recently come under scrutiny due to safety concerns, including adverse renal outcomes. In contrast, crystalloids, particularly balanced crystalloids, are now preferred. Balanced crystalloids improve acid-base status and pose a lower risk of hyperchloremic metabolic acidosis than 0.9% saline. This review summarizes the key findings of recent clinical trials comparing the efficacy and safety profiles of crystalloids and colloids in ICU settings with a specific focus on neurocritical care populations.
Pluralismos Jurídico e bioético: como sujeitos coletivos de direitos nos ensinam sobre os limites do principialismo e a emergência do múltiplo
Authors: Holanda Marianna Assunção Figueiredo
Published: December 2024

Uma das mais importantes sendas da reflexão bioética é o seu desafio prático, a concretude dos dilemas morais e da aplicabilidade dos direitos. Os Estados nacionais e as cartas constitucionais que os formulam são registro de contendas históricas cujo resultado é a narrativa hegemônica, o discurso de quem forjou a autoridade para registrar a história, para dar nomes a eventos, a valores, a princípios. No jogo de forças que formam as leis existe também o desafio de fazê-las responder às realidades da vida cotidiana. Quando abordamos sujeitos de direitos coletivo – como povos e comunidades tradicionais – novos dilemas apontam: há a camada comunitária, consuetudinária e ainda a que extrapola o humano: como os direitos territoriais. Defende-se aqui o direito de renomear a Bioética e os Direitos Humanos desde aqueles que as leis não alcançam – estariam estes mais próximos do ideal de justiça?
Geomorphology, Geoarchaeology and their multiscalar approaches
Authors: Coeli Lilian , Oliveira Fabio Soares de , Rodet Maria Jacqueline , Valadão Roberto Célio
Published: December 2024

This paper discusses the importance of the multiscale approach in geoarchaeological investigations, highlighting the contribution of Geomorphology to this purpose. Although Geoarchaeology does not have a single definition, due to its inter and transdisciplinary nature, in most definitions it uses methods from Geosciences, and in particular from Geomorphology. It deals with everything from archaeological sites to the analysis of the landscape inhabited by human groups, although few studies integrate the various spatial and temporal scales which are essential to understand the complexity of the phenomena. The multiscale approach offers the potential to enrich geoarchaeological analysis by considering the physical elements of the landscape, such as rocks, terrain, soils, and sediments at different temporalities and levels of spatial organization. This broadens the understanding of human interaction with the environment. The widely disseminated model in Geomorphology, which considers forms, materials, and processes at different hierarchical levels of topographic compartmentalization, surface structure, and landscape physiology, coupled with long, medium, and short-term dynamics, represents a promising methodological approach for archaeological site studies. The multiscale approach, therefore, can complement all stages of analysis and has extensive applicability in Geoarchaeology.
Backyard gardening in the face of exacerbating rates of hunger and poverty in South Africa
Authors: Lubisi Mafika , Simelane Mafikizolo
Published: December 2024

Backyard gardening holds immense promise as a viable solution to combat the escalating rates of hunger and poverty in South Africa. This study examines the dynamics of backyard gardening, its significance, potential contributions to food security and the myriad challenges it faces. The literature review explores the diverse dimensions of backyard gardening drawing insights from scholarly research and policy documents. The study underscores the pivotal role of backyard gardening in addressing food security, enhancing nutrition and promoting socio-economic resilience within communities. However, significant barriers such as limited access to land, water scarcity and inadequate support structures pose formidable challenges to its widespread adoption and effectiveness. Analysing the legislative frameworks, policy landscape and organisational initiatives surrounding backyard gardening illuminates’ pathways for overcoming barriers and harnessing its transformative potential. Moreover, it underscores the importance of reimagining backyard gardening as a dynamic strategy for inclusive development, grounded in principles of equity, sustainability and community empowerment. Through strategic interventions aimed at promoting equitable land tenure, enhancing water resource management and fostering community capacity building, South Africa can leverage backyard gardening as a powerful tool in its quest for a more resilient and food-secure future.
Mirror Descent Methods with Weighting Scheme for Outputs for Optimization Problems with Functional Constraints
Authors:   Moscow Institute of Physics and Technology, Alkousa M. S. ,   Innopolis University, Stonyakin F. S. ,   Damascus University, Abdo A. M. ,   Moscow Institute of Physics and Technology, Alcheikh M. M.
Published: December 2024

This paper is devoted to new mirror descent-type methods with switching between two types of iteration points (productive and non-productive) for constrained convex optimization problems with several convex functional (inequality-type) constraints. We propose two methods (standard one and its modification) with a new weighting scheme for points in each iteration of methods, which assigns smaller weights to the initial points and larger weights to the most recent points, thus as a result, it improves the convergence rate of the proposed methods (empirically). The proposed modification makes it possible to reduce the running time of the method due
Accelerated Zero-Order SGD under High-Order Smoothness and Overparameterized Regime
Authors:   ISP RAS Research Center for Trusted Artificial Intelligence, Bychkov G. K. ,   ISP RAS Research Center for Trusted Artificial Intelligence, Dvinskikh D. M. ,   ISP RAS Research Center for Trusted Artificial Intelligence, Antsiferova A. V. ,   Institute for Information Transmission Problems of RAS, Gasnikov A. V. ,   ISP RAS Research Center for Trusted Artificial Intelligence, Lobanov A. V.
Published: December 2024

We present a novel gradient-free algorithm to solve a convex stochastic optimization problem, such as those encountered in medicine, physics, and machine learning (e.g., the adversarial multi-armed bandit problem), where the objective function can only be computed through numerical simulation, either as the result of a real experiment or as feedback given by the function evaluations from an adversary. Thus, we suppose that only black-box access to the function values of the objective is available, possibly corrupted by adversarial noise: deterministic or stochastic. The noisy setup can arise naturally from modeling randomness within a simulation or by computer discretization, or when exact values of the function are forbidden due to privacy
Design of Teleoperation System for Control over Industrial Manipulators with Upper-Limb Exoskeleton
Authors:   Innopolis University, Damindarov R. R. ,   Department of Computer Science, University College London, Gaponov I. ,   Innopolis University, Maloletov A. V.
Published: December 2024

This paper discusses how to develop and implement a bimanual teleoperation system using an exoskeleton suit and two collaborative robots. In the mathematical model, two methods of mapping have been implemented: Joint space mapping via direct control and Cartesian space mapping using Saturation in the Null Space. Both methods are verified in simulation using the developed mathematical model and on hardware using KUKA IIWA robots. A pick-and-place experiment is designed, and the corresponding end-effector positions of the master and the slave devices are obtained. Force feedback is introduced using two methods to improve accuracy and to show the applicability not only for collaborative robots but also on industrial manipulators.
Development of a Lever-Based Twisted String Actuator for Exoskeleton Systems
Authors:   Innopolis University, Kirilin A. D. ,   Innopolis University, Skvortsova V. A. ,   Innopolis University, Koshman V. V.
Published: December 2024

Moreover, the results showed that the lever-based TSA provided the necessary torques for the hip joint, aligning well with the natural movement of the human body. This makes it easier to control and adapt the system in practical exoskeleton applications, enhancing its usability and effectiveness.
Stabilization of a Spherical Robot with an Internal Pendulum During Motion on an Oscillating Base
Authors:   Udmurt State University, Karavaev Yu. L. ,   Udmurt State University, Klekovkin A. V. ,   Kalashnikov Izhevsk State Technical University, Nazarov A. V.
Published: December 2024

This paper is concerned with the experimental development of the stabilizing regulator for a spherical pendulum-type robot moving on an oscillating base. Using a mathematical model of the motion of the spherical robot with an internal pendulum mechanism, a regulator stabilizing the lower position of the pendulum is developed. The developed regulator has been tested in practice by means of a real prototype of the spherical robot. The results of real experiments are presented to assess the stabilization of the lower position of the pendulum of the spherical robot during its motion along a straight line on a plane executing longitudinal oscillations, and during the stabilization of the lower position of the pendulum, when the spherical shell remains fixed relative to the plane.
Development of a System for Monitoring Medical Indicators Using Electromyography and Electrocardiography to Calculate Exoskeleton Efficiency
Authors:   University Innopolis, Koshman V. V. ,   University Innopolis, Skvortsova V. A. ,   University Innopolis, Kirilin A. D.
Published: December 2024

The use of exoskeletons in manufacturing, construction, and healthcare shows potential for enhancing performance and reducing injury risk. This study evaluates exoskeleton efficacy during heavy lifting using an advanced system integrating electromyography (EMG) and electrocardiography (ECG). Real-time monitoring with baseline correction and filtering ensured precise data. EMG analyses using Root Mean Square (RMS) and Integral methods revealed reduced muscle activation and cumulative exertion during exoskeleton-assisted tasks. ECG data indicated lower cardiovascular strain. Testing with a hip exoskeleton confirmed its ability to decrease physical load, emphasizing the value of integrated physiological monitoring for comprehensive exoskeleton performance assessment and future research directions.
A Methodology to Rank Importance of Frequencies and Channels in Electromyography Data with Decision Tree Classifiers
Authors:   Innopolis University, Abdullaev N. ,   Innopolis University, Baranov M. A. ,   Innopolis University, Koshman V. V. ,   Innopolis University, Mahonin V. A. ,   Innopolis University, Nasybullin A. A.
Published: December 2024

This study presents a methodology for identifying the most informative frequencies and channels in electromyography (EMG) data to evaluate muscle recovery using Decision Tree classifiers. EMG signals, recorded from the vastus lateralis muscle during squat exercises, were analyzed across varying rest intervals to assess optimal recovery periods. By employing single Decision Tree classifiers, the study enhances interpretability, offering insights into feature importance — essential for applications in medical and sports settings where transparency is critical. The experimental protocol utilized a grid search for hyperparameter tuning and cross-validation to address class imbalance, ultimately achieving a reliable classification of rest intervals based on power spectral density features. The results indicate that a limited subset of highly informative features provides sufficient accuracy, suggesting that streamlined, interpretable models are effective for the evaluation of muscle recovery. This approach can guide future research in developing compact, robust models adapted to EMG-based diagnostics.
Average-Case Optimization Analysis for Distributed Consensus Algorithms on Regular Graphs
Authors:   Moscow Institute of Physics and Technology, Nguyen N. T. ,   Innopolis University, Rogozin A. V. ,   Innopolis University, Gasnikov A. V.
Published: December 2024

The consensus problem in distributed computing involves a network of agents aiming to compute the average of their initial vectors through local communication, represented by an undirected graph. This paper focuses on studying this problem using an average-case analysis approach, particularly over regular graphs. Traditional algorithms for solving the consensus problem often rely on worst-case performance evaluation scenarios, which may not reflect typical performance in real-world applications. Instead, we apply average-case analysis, focusing on the expected spectral distribution of eigenvalues to obtain a more realistic view of performance. Key contributions include deriving the optimal method for consensus on regular graphs, showing its relation to the Heavy Ball method, analyzing its asymptotic convergence rate, and comparing it to various first-order methods through numerical experiments.
Asymptotic Analysis of the Ruppert – Polyak Averaging for Stochastic Order Oracle
Authors:   Moscow Institute of Physics and Technology, Smirnov V. N. ,   Moscow Institute of Physics and Technology, Kazistova K. M. ,   Higher School of Economics, Sudakov I. A. ,   Innopolis University, Leplat V. ,   Steklov Mathematical Institute of Russian Academy of Sciences, Gasnikov A. V. ,   ISP RAS Research Center for Trusted Artificial Intelligence, Moscow, Russia, Lobanov A. V.
Published: December 2024

Black-box optimization, a rapidly growing field, faces challenges due to limited knowledge of the objective function’s internal mechanisms. One promising approach to addressing this is the Stochastic Order Oracle Concept. This concept, similar to other Order Oracle Concepts, relies solely on relative comparisons of function values without requiring access to the exact values. This paper presents a novel, improved estimation of the covariance matrix for the asymptotic convergence of the Stochastic Order Oracle Concept. Our work surpasses existing research in this domain by offering a more accurate estimation of asymptotic convergence rate. Finally, numerical experiments validate our theoretical findings, providing strong empirical support for our proposed approach.
YÜKLEME HIZININ HAFİF AGREGALI FARKLI TASARIMLARDA İMAL EDİLMİŞ KÂGİR BLOK ELEMANLARIN BASINÇ DAYANIMINA ETKİSİ
Authors: Gündüz Lütfullah , Kalkan Şevket Onur
Published: December 2024

Beton örneklerinin basınç dayanımı deneyi, beton kalite kontrolünde sıkça kullanılan bir testtir. Bununla birlikte, aynı karışım tasarımı kullanılarak üretilen örneklerin farklı yükleme hızları altında farklı basınç dayanım değerleri sergileyebildikleri bilinmektedir. Hafif betondan mamul kagir blok ürünleri çimento bağlayıcılı ürünler olup günümüzde inşaat sektöründe sıklıkla kullanılmaktadır. Bu ürünlerin en önemli kalite parametrelerinden bir tanesi de basınç dayanım değeridir. Beton örneklerinde olduğu gibi hafif kagir blok örneklerinde de basınç dayanımı yükleme hızına bağlı bir değerdir. Bu çalışmada, 13 ayrı geometrik tasarıma sahip kagir blok elemanının 6 ayrı yükleme hızı (0,005 MPa/s, 0,075 MPa/s, 0,01 MPa/s, 0,03 MPa/s, 0,05 MPa/s, 0,06 MPa/s) kullanılarak basınç dayanımları tespit edilmiş ve analiz bulguları karşılaştırılmıştır. Araştırma sonuçlarına göre, boşluklu kagir blokların basınç dayanımları 0,03 MPa/s yükleme hızına kadar yükselmekte, bu değerden daha yüksek kırma hızlarında ise basınç dayanımlarının tekrar azaldığı gözlemlenmiştir. Dolu formdaki kagir blokların basınç değerlerinin tamamının ise yükleme hızı arttıkça arttığı tespit edilmiştir.
SÜRDÜRÜLEBİLİR TEDARİK ZİNCİRİ YÖNETİMİ VE SÜRDÜRÜLEBİLİR STOK YÖNETİMİ: LİTERATÜR ARAŞTIRMASI
Authors: Deniz Ayça , Özdemir Yavuz , Yıldırım Mustafa , Aytekin Mehmet Alp
Published: December 2024

Tedarik zinciri yönetiminin (TZY) son dönemlerde sürdürülebilirliğin üç boyutuyla (ekonomik, çevresel ve sosyal) birleşimi sürdürülebilir tedarik zinciri yönetiminin (STZY) doğuşuna sebep olmuştur. Sürdürülebilir tedarik zinciri yönetimi, çevresel zararı minimuma indirirken işletmelerdeki sosyal refahı ve tedarik zinciri (TZ) karlılığını maksimize etmek için zincirin tüm elemanlarının; operasyonlarının, kaynaklarının, bilgilerinin ve fonlarının yönetimi olarak tanımlanmaktadır. Sürdürülebilir stok yönetimi (SSY) ise, STZY’nin önemli bir etkeni olup, deponun fiziki koşullarından ürünlerin teslimat sürecine kadar minimum çevresel etki ve maliyetle devamlı olarak yürütülmesidir. Bu çalışma, sürdürülebilir tedarik zinciri yönetimi, sürdürülebilir stok yönetimi ve sürdürülebilirliğin tedarik zincirlerine etkileri üzerine odaklanmaktadır. Ayrıca çalışma, sürdürülebilir tedarik zinciri yönetimi ve sürdürülebilir stok yönetiminin sürdürülebilirliğin üç boyutuyla (çevresel, sosyal, ekonomik) entegrasyonundan ve literatürde bu konudaki eksikliklerden bahsederek sürdürülebilirlik alanında çalışmalar yapmak isteyen araştırmacılara rehberlik etmeyi amaçlamaktadır.
MİKROSERVİS TABANLI E-TİCARET UYGULAMALARINDA SİPARİŞ ODAKLI ENDPOİNT YÖNETİMİ
Authors: Şen Hilal , Fırlar Talat
Published: December 2024

Günümüz teknolojisindeki hızlı gelişmeler, bireylerin gereksinimlerini ciddi oranda dönüştürmektedir. Teknolojinin bireyler üzerindeki etkisi baz alınarak dünyada her gün yeni gelişmeler yaşanmaktadır. Modern yazılım projelerinde ihtiyaçlara sürekli yenilerinin eklenmesi, ölçeklenebilirlik, hata izolasyonu, teknoloji çeşitliliği, esneklik gibi konularda sorunlara yol açmaktadır. Monolitik mimari’den günden güne mikroservis mimariye geçiş kaçınılmaz hale gelmektedir. Projelerin büyümesi ile mikroservis mimarilerin kullanım avantajlarından daha fazla yararlanılır hale gelinmiştir. Bu nedenle, monolitik mimari yerine mikroservis mimarisine geçiş, projelerin geleceğe yönelik hale getirilmesine imkan sunmaktadır. Tüketicilerin kolayca ihtiyaçları olan ürünlere ulaşımını kolaylaştırmak amacıyla, hızlı kargo, temassız teslimat ve temassız ödeme gibi seçenekler hayatımıza dahil olmuştur. Bu kapsamda tüketicilerin siparişlerinin hataya yer vermeden işlenilmesi ve teslimatının sağlanması büyük önem arz etmektedir.
Bu çalışmadaki amaç, e-ticaret uygulamalarında sipariş adımında meydana gelen bir takım hataların önüne geçilerek, maliyet, sistem karmaşıklığı, performans kaybı, veriler arası tutarlılık gibi konuların iyileştirilmesi sağlanıp tüketicilerin ihtiyaçlarına daha iyi yanıt vermek, daha optimize edilmiş bir deneyim sunulması amaçlanmıştır.
Çalışma kapsamında, mikroservis mimari ile oluşturulmuş e-ticaret uygulamasında yapılan bir istek, anında servislerden herhangi birinde alınacak olan hata, bütün isteği başarısız kılıyor olup, tüketiciler tarafından bakıldığında kabul edilebilir bir sonuç değildir. Oluşan problem üzerinde hata mekanizmalarının uygulanabilirliği, uygulamaların nasıl işleneceği, mekanizmaları kullanmanın kazanımları, kullanılması ve kullanılmaması durumlarında yaşanacak etkenlerin analizlerine yer verilmiştir.
Cadernos de receitas culinárias em arquivos pessoais: um patrimônio histórico-educativo a partir dos sabores da cozinha (Florianópolis, 1950/1980)
Authors: Andrade Ana Luiza Mello Santiago de , Cunha Maria Teresa Santos
Published: December 2024

O trabalho objetiva historicizar uma coleção de cadernos de receitas (3 exemplares) escritos entre as décadas de 1950 a1980, abrangendo três gerações de mulheres, professoras em Santa Catarina que estão preservados em um arquivo pessoal. A análise contemplará o material como registro memorial de uma prática fruto de saberes escolarizados e que de geração a geração, tornou-se uma experiência político-educativa. Considera-se a coleção de cadernos de receitas como portadora de um sistema de visão de mundo sobre culinária em diálogo com aspectos da cultura política e igualmente, aborda-se sua presença como objetos-relíquia em arquivos pessoais, entendidos na clave do Patrimônio Histórico-Educativo.
Perfil y caracterización de los consumidores de productos de origen vegetal en Chile
Authors: Campos Zócimo , Yanine Fernando , Nikulin Chandia Christopher , Oyarce Ibarra Claudia
Published: December 2024

La tendencia de consumo de productos de origen vegetal ha aumentado en todo el mundo por diversas razones, y Chile ha sido un buen ejemplo de esta tendencia. Aunque la sostenibilidad, la salud, la nutrición y el sabor pueden parecer los principales impulsores para los flexitarianos que buscan alimentos y bebidas de origen vegetal, hasta la fecha no existe investigación que permita caracterizar y perfilar a los consumidores chilenos de estos productos. Por lo tanto, este trabajo busca cerrar esta brecha. Para abordar este problema, realizamos una encuesta en línea a 512 personas, enfocándonos principalmente en la Región Metropolitana y Valparaíso. Utilizando el método de Ward, identificamos 3 grupos: (1) Amigables con los animales, (2) Amigables con el planeta y (3) Estilo de vida saludable, donde, respectivamente, se prioriza el bienestar animal, el cuidado del medio ambiente y la preocupación por la salud.
Biodiversity, spatial, and seasonal distribution of the zooplankton community in semi-intensive fish farms in Rondônia state, Brazil
Authors: Pedroti Vinicius Perez , Dantas Filho Jerônimo Vieira , Santos Bruna Lucieny Temponi , Pinheiro Maria Mirtes de Lima , Sousa Raniere Garcez Costa , Prado Ed Johnny da Rosa , Da Silva Francisco Carlos , Schons Sandro de Vargas
Published: December 2024

In this study we determined the spatial and seasonal distribution (rainfall and drought) of the zooplankton community in 30 fish farms in the microregions of Vale do Jamari and Central-East of Rondônia. The experiment was organized in a completely randomized factorial scheme. The species were considered in composition, richness, frequency of occurrence, relative abundance and diversity indices (H’, J and S). There were records of greater richness of Copepoda (550 to 1214), Ostracoda (360 to 989.6), Rotifera (71 to 431) and Cladocera (344 to 990). In the Jamari Valley, the most abundant species (Individuals per 100 mL) were Ostracoda (323), Copepoda (160) and Rotifera (111). In the Center- East, they were Copepoda (287), Rotifera (108) and Ostracoda (106). In the two microregions there were variations in the seasonal distribution, except for the populations of the phylum Cloadocera. The diversity indices differed, registering a greater diversity of populations of Ostracoda in the Jamari Valley and Copepoda in the Center-East and in the rainy season.
The Role of Knowledge, Creativity and Self-Confidence in the Performance of High School Prinsipals Using SEM-SmartPLS Analysis
Authors: Malingkas Melky , Sobon Kosmas , Mangundap Jelvi M. , Anay Zhuldiz
Published: December 2024

Effective leadership hinges on knowledge, creativity, and self-confidence in dynamic school environments. This study examines the contribution of these traits to high school principals' performance in leadership. Employing a quantitative approach, a survey was conducted with 75 respondents selected from a population of 308 using random sampling. Data were analyzed using Structural Equation Modeling (SEM) with SmartPLS software version 3.0, allowing in-depth exploration of the relationships between knowledge, creativity, self-confidence, and performance. The findings reveal that knowledge contributes 45%, creativity 30%, and self-confidence 25% to leadership effectiveness, collectively accounting for 87.5% of the variance in performance among school principals. Principals with strong knowledge, creativity, and self-confidence are better equipped to implement innovative strategies, motivate staff, and achieve educational goals. This study underscores the importance of professional development programs to enhance these attributes, emphasizing creativity and decision-making skills. Such initiatives can better prepare principals to navigate the complexities of modern educational leadership, including curriculum changes, resource constraints, and technological advancements. The research offers actionable insights for policymakers, educators, and administrators aiming to improve school leadership quality. It also highlights the mediating role of self-confidence in translating knowledge and creativity into practical leadership actions. These findings contribute to the broader discourse on leadership in education and provide a foundation for future studies to explore additional factors influencing principals’ performance.
Effectiveness of Guided Inquiry Learning With PhET Simulation to Improve Students’ Critical Thinking Ability and Understanding of Reaction Rate Concepts
Authors: Drastisianti Apriliana , Dewi Arini Kusuma , Alighiri Dante
Published: December 2024

In modern education, fostering critical thinking skills is essential, enabling students to analyze, interpret, and conclude information effectively. This study evaluates the effectiveness of a guided inquiry learning model integrated with PhET simulations in enhancing students' critical thinking abilities and comprehension of reaction rate concepts. The research was quasi-experimental and assigned to experimental and control groups. The study employed pretest and posttest measures using essay questions to assess critical thinking and conceptual understanding. Results from the t-tests demonstrated significant improvements in both critical thinking (count = 2.240 > table = 1.666) and conceptual understanding (count = 3.064 > table = 1.666) for students engaged in guided inquiry with PhET simulations compared to those in traditional discovery learning settings. These findings underscore the potential of guided inquiry supported by simulations to create an interactive and engaging learning environment, promoting deeper cognitive processing and retention. By merging inquiry-based learning with technological tools, educators can enhance student engagement and facilitate a hands-on approach to complex topics, preparing students for more sophisticated academic and real-world problem-solving scenarios. This study suggests that guided inquiry, complemented by PhET simulations, strengthens conceptual foundations and nurtures critical analytical skills necessary for academic success and beyond
Examining the Influence of Interpersonal Communication, Leadership Capability, Adaptability, and Excellence on Managerial Competence and Leadership Performance in Maritime Vocational Higher Education
Authors: Hartanto Cahya Fajar Budi , Sukestiyarno Yohanes Leonardus , Rusdarti Rusdarti , Abdurrahman Abdurrahman
Published: December 2024

Understanding how leadership moderates the effectiveness of maritime vocational higher education institutions is essential but underexplored. This study investigated the relationships between interpersonal communication, adaptability, capability, leadership excellence, managerial competence, and perceived leadership performance. A quantitative causal design was employed, collecting data through structured questionnaires from 145 lecturers at maritime vocational higher education institutions in Indonesia using purposive sampling. Data were analyzed using Structural Equation Modeling (SEM) with Partial Least Squares (PLS) to evaluate path coefficients and relationships between variables. The results indicate that interpersonal communication significantly influences perceived leadership performance but does not directly impact managerial competence. Conversely, leadership adaptability enhances both managerial competence and perceived leadership performance. Leadership excellence emerged as the most critical factor positively influencing both outcomes, while leadership capability demonstrated no significant direct effects on either. Additionally, managerial competence did not moderate the relationships between predictor variables and perceived leadership performance. These findings underscore the importance of fostering adaptability, communication, and leadership excellence in maritime vocational education. Tailored leadership development programs are necessary to cultivate these competencies among future leaders, enabling them to navigate the unique challenges of this sector. By focusing on these areas, institutions can prepare flexible, competent, and equipped leaders to enhance performance and managerial effectiveness in maritime education.
Further Improvement of the Mathematical Model of Thermo and Gas-Dynamic Processes in a Turbine without Working Blades of Some Stages
Authors: Usatyi Oleksandr , Klob Anton
Published: December 2024

The current state of the Ukrainian power system is characterized by significant stress and a shortage of generating capacities. Restoration and implementation of new generating capacities require a huge amount of appropriate resources and a lot of time. The optimal low-cost and relatively fast option for improving the state of the power system may be the temporary use of damaged power equipment after taking appropriate preventive and repair measures. The emergency state of steam turbines of many power plants requires a special tool for assessing their efficiency and power, as well as the possibility and feasibility of their further use after damage. This paper gives consideration to an improved mathematical model of thermo and gas-dynamic processes in a turbine without working blades of some stages. The test calculation data obtained for the flow parts of the cylinders of various steam turbines in the absence of working blades were presented both for individual stages and the groups of stages. Characteristic patterns of the effect of the location of the stage without working blades in the turbine cylinder on the efficiency of the flow part have been established. The greatest decrease in the efficiency and power of the cylinder occurs in the case of the absence of working blades in the stages located closer to the cylinder head. The lowest efficiency and power losses are observed in the absence of working blades of the last stage. In the nozzle cascades of the stages located directly behind the stages without working blades, the levels of energy losses are increased significantly. The use of the developed mathematical model allows us to find solutions to increase the efficiency of turbines with missing working blades in some stages by changing the geometry of the appropriate nozzle cascades.
The Effect of Mach and Reynolds Numbers on the Aerodynamic Characteristics of the Nozzle Cascade of a Gas Turbine
Authors: Lapuzin Alexander , Subotovich Valery , Yudin Yuriy , Naumenko Svetlana
Published: December 2024

The data of experimental studies of a circular nozzle cascade for a small-sized gas turbine with a medium ratio of the diameter to the blade height as part of a turbine stage, as well as in conditions of joint operation with a radial diffuser have been presented. In the presence of an impeller, the Mach number varied in the range of 0.3 to 0.85, and in static conditions it varied in the range of 0.3 to 1.4. The flow rate coefficient was determined by the integral method using drains, and the loss coefficients and averaged flow angles were determined based on the data of detailed measurements of the flow parameters behind the cascade using pneumometric probes. The aerodynamic efficiency of the nozzle cascade is at a very high level and in the calculated transonic mode the kinetic energy loss coefficient is 0.052, and the total loss coefficient is 0.09. For modes, where the Mach number is equal to 0.6, a very strong effect of the boundary conditions behind the nozzle cascade on its aerodynamic characteristics is recorded and it is indicative of the drawbacks of experiments without an impeller. It is established that the impeller can be abandoned if the Mach number exceeds 0.85. It is also established that for a Mach number above 1.15, the Reynolds number of 10,5×105 is self-similar for the flow rate  coefficient. When the Mach number is increased to 1.25, the nozzle cascade is completely closed, and the flow coefficient in the self-similarity zone reaches a maximum in terms of the Reynolds number. For the thermal calculations of the stage, the averaged angle of the flow exit from the nozzle cascade and its total loss coefficient that takes into account not only kinetic energy losses, but also kinematic losses should be used.
Use of Biogas in Gas Turbines for the Production of Heat and Electricity
Authors: Chernousenko Olga , Vlasenko Olga
Published: December 2024

In the modern developed countries of the world, the main part of the extracted fuel and energy resources is spent on the production of electricity and heat of low and medium potential. In Ukraine, the biomethane production potential is estimated at 7.8 billion m3/year, which is 25 % of the current natural gas consumption in the country. The infrastructure of Ukraine is ready for transportation and energy use of biomethane, as biomethane is a complete analogue of natural gas. When storing organic waste ("bio-waste") – for example, the organic part of household waste - biogas, a mixture of methane and carbon dioxide, is released. This gas is a high-quality fuel for gas engines or gas turbines - just like methane gas produced from biomass in sewage treatment plants. Biogas can replace fossil fuels and is also characterized by its CO2 neutrality. Biogas can be burned on-site with little to no processing to heat buildings and power boilers or even the reactor itself. Biogas can be used for combined heat and power generation, can be simply converted to electricity using an internal combustion engine, fuel cells or gas turbine, with the resulting electricity being used on-site or sold into the electricity grid. Taking into account the advantages of using biogas, as well as the price policy for natural gas, the study carried out a calculation of the thermal scheme of the state district power plant. Natural gas is used as the main fuel, biogas was chosen for comparison. The specific heat of combustion of biogas is almost half that of natural gas. When operating on biogas, the efficiency of a gas turbine installation is 8.5 % lower, and that of a steam-gas installation is 7.5 % lower than on natural gas. Since 1000 m³ of natural gas is equivalent to 1,00 m³ of biogas, a biogas accounting factor has been introduced. On the basis of the relevant research, conclusions were drawn regarding the use of biogas as an alternative to natural gas. The relevance of the use of biogas for the production of heat and electricity is to provide a promising source of electricity and reduce carbon dioxide emissions.
Complex Calculation Method of Air Cooling Systems of Gas Turbines and Lubrication Systems of Bearing Assemblies
Authors: Tarasov Alexsandr , Lytvynenko Oksana , Myhaylova Irina , Ismailov Vladyslav
Published: December 2024

The article is devoted to the improvement of the calculation methodology of air cooling systems and oil supply systems of gas turbine bearings by reasoned selection of boundary conditions and the structure of a homogeneous flow, which allows in the process of developing the support nodes of the engine rotor to determine the influence of geometric and mode parameters on the distribution of oil and the coefficient of heat transfer to the walls of the chamber, which forms an oil cavity. During the simulation, special attention is paid to the physics of the process, since a coolant with different properties can move in the channels of the cooling system, namely: liquid (oil), gas (air), or an air-oil mixture. If there is a two-phase substance in the channel, then the properties depend not only on the amount of gas content, but also on the orientation and geometric characteristics of the channels through which it flows.
Aeroelasticity Analysis of Turbine Blade with Asymmetric Outlet Pressure
Authors: Kolodyazhnaya Lyubov , Bykov Yuriy , Rzadkowski Romuald
Published: December 2024

Elements of high-power steam turbines are subjected to significant unsteady loads, in particular, rotor blades of the last stages. These loads can, in some cases, cause self-excited oscillations, which are extremely dangerous and have a negative impact on the efficiency and service life of the blade cascade. Therefore, when designing new or modernizing existing steam turbine stages, it is recommended to study the aeroelastic characteristics of the blades. The paper presents the results of numerical analysis of the aeroelastic characteristics of the rotor blade cascade of the last stage of a 380 MW steam turbine, taking into account the asymmetric pressure distribution behind the stage. The pressure distribution is caused by the influence of the exhaust hood and was obtained experimentally. The analysis used a proven numerical method for simultaneously solving the coupled problem of unsteady aerodynamics and elastic oscillations of blades, which allows predicting the amplitude-frequency spectrum of unsteady loads and blade oscillations in a viscous gas flow. The modeling results are presented in the form of displacements of the peripheral blade section and aerodynamic forces acting on this section, as well as their spectra. Also, the dependence of the aeroelasticity coefficient on the inter-blade phase angle of oscillation was obtained. The results of the calculations showed the absence of flutter and self-oscillations according to the first natural form of blade oscillations in the partial mode of operation of a steam turbine. The analysis of the results did not reveal a significant effect of the pressure asymmetry at the outlet of the cascade, due to the significant difference between the excitation frequencies caused by the non-uniformity and the natural frequencies of blade oscillations.