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Found 6515 publications

Mitigation of inductive coupling effects on buried pipelines using gradient control conductors of overhead line configuration and hippopotamus optimization algorithm

Sid Ahmed Bessedik Rabah Djekidel Kelthoum Hachani Bentouati Bachir Ragab A. El-Sehiemy

Publication Name: Scientific Reports

Publication Date: 2026-12-01

Volume: 16

Issue: 1

Page Range: Unknown

Description:

By electromagnetic perturbation effect, the extra-high voltage (EHV) overhead transmission lines can cause significant induced voltages and currents on buried metallic pipelines located in the immediate vicinity. These voltages can present a source of hazard both for the structural I ntegrity of the metallic pipeline and for the safety of personnel responsible for operation and maintenance. This paper proposes the quasi-static modeling of the electromagnetic interference to which a buried metallic pipeline will be subjected nearby an extra-high voltage (EHV) overhead transmission line, under steady-state operating conditions of the power electrical grid. Using the electrical network analysis method to evaluate the induced voltage levels and its effects on the buried pipeline; also, to propose a mitigation strategy if necessary. The results obtained show that the values of the AC induced voltage on the buried pipeline are significant and exceed the limits defined by the international NACE standard. They can cause a risk of electrocution for intervention personnel and accelerate the process of metal corrosion. Therefore, the gradient control mitigation technique of the conductors and their optimal geometric arrangement of EHV transmission line using Hippopotamus Optimization (HO) algorithm were proposed to reduce AC induced voltages within the permissible safety limits, according to the requirements of the NACE Standard. Finally, it should be noted that the implementation of these mitigation approaches have led to remarkable results in eliminating potential risks.

Open Access: Yes

DOI: 10.1038/s41598-026-40852-5

Effect of Internal Structural Design on Stress Distribution in 3D-Printed Subperiosteal Implants Under Mechanical Loading

Ibolya Zsoldos J. Kónya Ádám Vörös Balázs Lőrincz

Publication Name: Bioengineering

Publication Date: 2026-03-01

Volume: 13

Issue: 3

Page Range: Unknown

Description:

Custom-made subperiosteal implants are increasingly used in clinical cases where significant bone loss due to trauma or disease renders conventional endosseous implant placement unfeasible. This study investigated how different internal structural designs affect the deformation and stress distribution in mandibular subperiosteal implants under clinically relevant loading conditions. An idealized implant geometry was defined based on average human mandibular dimensions, and four configurations with identical outer shape and connection features were created, differing only in sidewall architecture (solid, top-relieved, top-relieved with lateral perforations, and top-relieved lattice framework). All specimens were manufactured by metal additive manufacturing and evaluated using cone-beam computed tomography (CBCT). Mechanical testing was performed in two stages: (i) cyclic loading consisting of 500 bite cycles at an overall force of ~326–350 N and (ii) a single static high-load event of 2000 N, applied parallel to the fixation pin axes. CT datasets acquired before and after each stage were compared to detect permanent deformation. No measurable residual deformation was identified in any configuration; the only observed macroscopic change was an adhesive-bond limitation in one case, rather than structural yielding of the implant. Finite element analysis further supported these findings by identifying localized stress concentrations mainly at the implant–prosthetic interface and by revealing the load-transfer zones that govern the mechanical response. Overall, the results indicate that lightweight, perforated, and lattice-based internal designs can preserve global structural integrity across physiological and supra-physiological load ranges while enabling design optimization to improve stress distribution.

Open Access: Yes

DOI: 10.3390/bioengineering13030368

Trophic evolution in ornithopod dinosaurs revealed by dental wear

Gábor Botfalvai Imre Szenti Martin Segesdi András Lajos Nagy Lívia Vásárhelyi János Magyar Viviána Jó Zoltán Csiki-Sava Paul M. Barrett Attila Ősi

Publication Name: Nature Communications

Publication Date: 2024-12-01

Volume: 15

Issue: 1

Page Range: Unknown

Description:

Ornithopod dinosaurs evolved numerous craniodental innovations related to herbivory. Nonetheless, the relationship between occlusion, tooth wear rate, and tooth replacement rate has been neglected. Here, we reconstruct tooth wear rates by measuring tooth replacement rates and tooth wear volumes, and document their dental microwear. We demonstrate that total tooth volume and rates of tooth wear increased steadily during ornithopod evolution, with deeply-nested taxa wearing up to 3360 mm3 of tooth volume/day. Increased wear resulted in asymmetric tooth crown formation with uneven von Ebner line increment width by the Late Jurassic, and in faster tooth replacement rates in multiple lineages by the mid-Cretaceous. Microwear displays a contrasting pattern, with decreasing complexity and pit percentages in deeply-nested and later-occurring taxa. We hypothesize that early ornithopods were browsers and/or frugivores but deeply nested iguanodontians were bulk-feeders, eating tougher, less nutritious plants; these trends correlate with increasing body mass and longer gut passage times.

Open Access: Yes

DOI: 10.1038/s41467-024-51697-9

At the Borderline of Public and Private Law: The Restitution of Cultural Property Held in Public Collections in Hungary

Vanda Vadász Viktória Verebélyi

Publication Name: Santander Art and Culture Law Review

Publication Date: 2024-01-01

Volume: 2024

Issue: 2

Page Range: 181-208

Description:

During the Second World War, and thereafter until the end of the communist regime in 1989, a massive amount of private-ly owned works of art came into the possession of the Hungarian state. The ownership of the property thus collected was only par-tially clarified after the war. After the fall of communism, national-ized cultural property was subject to restitution laws, but restitution typically meant partial compensation. The aim of this article is to highlight the shortcomings that still characterize the restitution of cultural property held in public collections in Hungary. After summa-rizing the historical-legal situation pertaining to restitution measures in Central and Eastern Europe, we provide a comprehensive overview of the Hungarian legal environment in terms of restitution. The focus is on the restitution rules adopted in the 2010s that were intended to settle the possession of cultural property held in public collections. The roots of constitutional issues related to the regulation arise from and are reflected in the intermingling of private law and public law characteristics and guarantees. In the presentation of civil law disputes concerning the ownership rights of property held in public collections, we outline the characteristics of the Hungarian regula-tory framework regarding protected cultural property and the issues arising from their application. Finally, we provide an overview of the European Court of Human Rights’ jurisprudence on the protection of property rights and an assessment of Hungarian regulations before the Court. We claim that the lack of predictability and certainty of the latter authority’s proceedings may lead to human rights issues.

Open Access: Yes

DOI: 10.4467/2450050XSNR.24.017.20828

Preface

Robert Fullér Francesco Masulli Silvio Giove

Publication Name: Lecture Notes in Computer Science Including Subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics

Publication Date: 2019-01-01

Volume: 11291 LNAI

Issue: Unknown

Page Range: V

Description:

No description provided

Open Access: Yes

DOI: DOI not available

Impact of Coordinate System Selection and Model Observability on Position Sensorless State Estimation of Nonsalient-Pole PMSM

Miklós Kuczmann Krisztian Horvath

Publication Name: 2024 IEEE 21st International Power Electronics and Motion Control Conference Pemc 2024

Publication Date: 2024-01-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

Model observability is essential for the design of state estimators and observers, since the state vector can only be fully reconstructed from the measurements, if the model is observable. However, some research articles do not perform observability analysis and use unobservable models, while the presented results show adequate estimation performance. This paper deals with the impact of observability on the position sensorless state estimation of nonsalient-pole permanent magnet synchronous machine (PMSM). To show how the observability depends on the chosen coordinate system, observability studies are presented for two widely used nonlinear state-space models given in either the stator or the rotor reference frame. For the stationary reference frame model, a necessary and sufficient observability condition is defined, and it is shown that the model using rotor-oriented variables is unobservable. To point out the limitations of using the unobservable model, comparative simulations are carried out between extended Kalman filters using the models presented.

Open Access: Yes

DOI: 10.1109/PEMC61721.2024.10726413

Personalized learning opportunity in 3D VR

Ildiko Horvath

Publication Name: 11th IEEE International Conference on Cognitive Infocommunications Coginfocom 2020 Proceedings

Publication Date: 2020-09-23

Volume: Unknown

Issue: Unknown

Page Range: 425-430

Description:

Result of modern digital age, the concept of Personal Learning Environments (PLEs) are becoming more relevant in today's academic world. Personalization is needed to make a product or service or an educational environment more endearing to the target audience, and this is especially true for VR Learning. The paper examines the learning effectiveness connecting to the personalized learning content with the participation of 90 students. The personalized VR education was based on an examination of students' learning type and attribute. In the experiment, the same curricula is compared when executed using audio, visual or reading type of learning content. To determine the learning style of students, the Kolb's learning test were applied. Tests show that the users were able to complete the tests with at least 20% effectiveness, if the learning materials fits their learning type.

Open Access: Yes

DOI: 10.1109/CogInfoCom50765.2020.9237895

Linguistic Linear Diophantine Fuzzy Sugeno Border Approximation Area Comparison: Application in Green Supply Chain Management

Dragan Pamucar Zeeshan Ali

Publication Name: Journal of Fuzzy Extension and Applications

Publication Date: 2026-12-01

Volume: 7

Issue: 1

Page Range: 225-246

Description:

The Linguistic generalzied Fuzzy Set (FS) is more efficient and effective for depicting awkward and uncertain data compared to existing models. In this manuscript, we describe the Sugeno-Weber laws for linguistic generalzied fuzzy information. Because these operational laws will help us in the construction of the “power aggregation operators” for linguistic Linear Diophantine Fuzzy Sets (LDFSs), called “Power Averaging (PA) operator”, “Power Weighted Averaging (PWA)”, “Power Geometric (PG)”, and “Power Weighted Geometric (PWG)” for linguistic linear Diophantine fuzzy values. These models can help us aggregate the collection of data into a singleton set very easily. Additionally, we investigate the model of the multi-attributive border approximation area comparison technique for derived operators to enhance the effectiveness of the proposed theory. The problem of supply management is used for the integration of environmentally friendly procedures into supply chain management techniques, where the model of sustainable sourcing, eco-design, waste management, energy efficiency, transportation, and collaboration are the major parts of the considered theory. For this, we illustrate some numerical problems for evaluating the problem of supply chain theory by using the proposed models. Finally, we deliberate on the power and strength of the suggested models by comparing the value of the proposed and existing models.

Open Access: Yes

DOI: 10.22105/jfea.2025.498172.1754

Energy security challenges in Europe: the importance of renewable energy innovations for economic viability after Russia Ukraine war

Valentinas Navickas Yuriy Bilan Raimondas Paskevicius Mantas Svazas Umer Shahzad

Publication Name: Environment Development and Sustainability

Publication Date: 2025-01-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

Europe's energy security is a very relevant and debatable topic today, especially since the Russia Ukraine conflict energy security is becoming a challenge for Europe. Many countries in the European Union do not have sufficient fossil energy resources and are dependent on neighboring, energy-rich countries. Such dependence on other countries in the EU is useless and even dangerous, both economically and politically or in terms of energy security. The EU faces serious energy security challenges due to its high dependence on external energy exporters. Countries that export energy resources can manipulate them and exert both economic and political pressure. The main problem is how to assess the energy transformation opportunities while strengthening energy security. Currently, there is a lack of research that would propose solutions to increase energy security on a national scale. Renewable energy solutions would allow achieving these goals, thus creating synergy with economic benefits. During the study, energy business representatives were interviewed in order to understand market trends and attitudes. When processing the data using the factor analysis method, results were obtained that reveal a clear connection between renewable energy and energy security. Research shows that geopolitical security becomes an important aspect when the volume of renewable energy deployment increases.

Open Access: Yes

DOI: 10.1007/s10668-025-06163-x