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Found 6412 publications

Performance comparison of polymer and fiber modified asphalt mixtures

Richárd Nagy Mohammad Fahad

Publication Name: Discover Applied Sciences

Publication Date: 2025-06-01

Volume: 7

Issue: 6

Page Range: Unknown

Description:

The performance of SBS-modified asphalt mixtures can be enhanced by incorporating various types of fibers offering a cost-effective alternative to increasing the SBS content. In this study, three different fibers, Basalt, Polyester, and Lignin fibers were added to a 3% SBS-modified bitumen binder, and their performance was compared to a 7% SBS mixture without fibers. Laboratory tests, including indirect tensile strength and dynamic shear rheometer tests, were used to evaluate the mixtures. The indirect tensile strength of all samples was assessed at loading rates ranging from 10 to 70 MPa/s, while stiffness moduli were tested at frequencies of 5 Hz, 3.5 Hz, 1.9 Hz, and 1.2 Hz. Finite element simulations using the Burger’s Logit model have been performed and microstrain analysis has been carried out to assess rutting and fatigue damage, complementing the experimental results. The findings demonstrated that fiber-modified mixtures exhibited superior performance, with increased tensile strength and complex shear modulus. Among the fiber types, Basalt fiber showed the best results, outperforming the others, while Polyester and Lignin fibers displayed nearly identical performance. The Basalt fiber mixture outperformed the SBS-7% mixture by 25% in rutting resistance and 28% in fatigue damage.

Open Access: Yes

DOI: 10.1007/s42452-025-07134-7

Issue on implementation Possibility of Bluetooth Mesh Capabilities into OmNET++

László Kajdocsi János Kovacs

Publication Name: Sisy 2018 IEEE 16th International Symposium on Intelligent Systems and Informatics Proceedings

Publication Date: 2018-11-05

Volume: Unknown

Issue: Unknown

Page Range: 203-207

Description:

Navigation was always important to humankind. Today, it is unimaginable to navigate in the world without the Global Positioning System. Although, the Global Positioning System operates very accurately outdoors but does not in indoor environments. Unfortunately, the indoor navigation is still in its infancy. However, several approaches have been proposed during the last decade but none of them is accurate and/or inexpensive enough for the consumer use. According to the authors' proposal, utilization of a hybrid mesh network might solve the inaccuracy. The mesh technology would offer an accurate, fast, adaptive, self-organizing, self-healing and inexpensive solution for the indoor positioning. A hybrid mesh network would involve some technologies like Wi-Fi, Bluetooth, RFID or IQRF. Fortunately, the Bluetooth Special Interest Group announced the mesh capability in the Bluetooth 5 standard in 2017. However, building up a physical network is always expensive experiment, thus simulations would be executed in a OmNET++. In this paper, the implementation possibility of the Bluetooth mesh capabilities will be analyzed.

Open Access: Yes

DOI: 10.1109/SISY.2018.8524830

Human factor in traffic models

Zsuzsanna Toth-Szabo Richárd Horváth Katalin Kovács

Publication Name: 2006 IEEE International Conference on Computational Cybernetics Iccc

Publication Date: 2006-12-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

This paper deals with modeling of human behavior in traffic systems. The first part of the paper gives a short survey of the corresponding literature introducing the most important problems of the area. The second part of the paper contains our approach aiming the development of a driver model applicable in the widely used simulation systems to describe practical traffic situations and analyze the safety aspects.

Open Access: Yes

DOI: 10.1109/ICCCYB.2006.305738

Corrigendum to ‘Graphical pinch analysis-based method for heat exchanger networks retrofit of a residuum hydrogenation process’ [Energy volume 299 (2024) 131538] (Energy (2024) 299, (S0360544224013112), (10.1016/j.energy.2024.131538))

Paweł Ocłoń Jin Wang Keke Zhi Yujie Chen Wei Li Bohong Wang Lianghui Guo Hengcong Tao Xinze Li Yuping Chen Petar Sabev Varbanov

Publication Name: Energy

Publication Date: 2024-11-30

Volume: 310

Issue: Unknown

Page Range: Unknown

Description:

The contribution of Pawel Oclon has been funded by the EU project “Renewable energy system for residential building heating and electricity production–RESHeat”, Grant Agreement #956255. The work of Petar Varbanov has been funded by the Széchenyi István University in Hungary. The authors would like to apologise for any inconvenience caused.

Open Access: Yes

DOI: 10.1016/j.energy.2024.133291

The Acquisition of Phonological Awareness in Children with Mild General Learning Difficulties: Delayed or Disordered Speech Development?

Enikő Csertán Krisztina Zajdó

Publication Name: On Under Reported Monolingual Child Phonology

Publication Date: 2020-01-01

Volume: Unknown

Issue: Unknown

Page Range: 274-323

Description:

No description provided

Open Access: Yes

DOI: DOI not available

Key Performance Indicators for Evaluating Electric Buses in Public Transport Operations

Ágoston Winkler Balázs Horváth Xiao Li

Publication Name: Vehicles

Publication Date: 2025-06-01

Volume: 7

Issue: 2

Page Range: Unknown

Description:

The evaluation of electric buses used in public transportation operations encompasses several critical factors that directly influence the operational efficiency, as well as the economic viability, environmental advantages, and user experience. Energy consumption is a critical metric for assessing the energy efficiency of electric buses. It facilitates a better understanding of vehicle performance across varying road conditions and advances the implementation of energy-saving solutions. The passenger demand model is a tool used to assess the quality and experience of electric buses, with the assessment being based on real usage. The operational mileage is defined as the driving distance of electric buses on a single charge. This parameter has a significant impact on both urban coverage and route optimization. The article under consideration identifies evaluation indicators for electric buses. These indicators are derived from a set of 100 questionnaire responses, which were collected in Győr, Hungary. The classification of the indicators into three segments—mechanical, operational and bus transportation system—is proposed, with the underlying rationale and significance of each indicator’s selection being elucidated. The findings indicate that this component is essential for developing a comprehensive evaluation system for electric buses and serves as a solid foundation for more intricate future studies.

Open Access: Yes

DOI: 10.3390/vehicles7020058

Vibration damping measurement on car windshields

Balázs Vehovszky Karl Slenczka Tamás Jakubík István Horváth Martin Schuster

Publication Name: Periodica Polytechnica Mechanical Engineering

Publication Date: 2019-01-01

Volume: 63

Issue: 1

Page Range: 1-6

Description:

Knowledge of the damping properties of a windshield is a fundamental element of the acoustical characterization of a car. The measuring method of damping for a windshield is presented in the paper. The damping loss factor – as a basic measure of mechanical damping – was determined experimentally by two means: the reverberation time from impact hammer testing as well as the modal behavior from 3D laser scanning vibrometer measurements. The results proved that the modal shapes have a fundamental effect on the measured damping values.

Open Access: Yes

DOI: 10.3311/PPme.11559

A finite-sample generalization bound for stable LPV systems

Mihály Petreczky Bálint Daróczy Martin Gonzalez Dániel Rácz András Benczúr

Publication Name: Mathematics of Control Signals and Systems

Publication Date: 2026-06-01

Volume: 38

Issue: 2

Page Range: 241-273

Description:

One of the main theoretical challenges in learning dynamical systems from data is providing upper bounds on the generalization error, that is, the difference between the expected prediction error and the empirical prediction error measured on some finite sample. In machine learning, a popular class of such bounds are the so-called Probably Approximately Correct (PAC) bounds. In this paper, we derive a PAC bound for stable continuous-time linear parameter-varying (LPV) systems. Our bound depends on a weighted H2-like norm of the chosen class of the LPV systems, but does not depend on the time interval for which the signals are considered.

Open Access: Yes

DOI: 10.1007/s00498-025-00427-7

A novel method for structural strength modeling of lamination stacks of electric motors using contact in FEA

Viktor Szabó Korbinian Weber

Publication Name: Results in Engineering

Publication Date: 2025-06-01

Volume: 26

Issue: Unknown

Page Range: Unknown

Description:

The automotive industry is transforming from traditional internal combustion drive systems to alternative ones, mostly based on electric motors. Fueled by strict requirements and high competition on the market, simulation has become an essential part of the development process. The precise structural strength simulation of rotors is extremely difficult, as a consequence of the nonlinear mechanical behavior of the lamination stack. Due to computational limits, this part has traditionally been simulated as a solid structure with orthotropic linear material models. These models were not capable of accurately simulating the axial nonlinear stiffness, the separation / slip of individual sheets or their plastic deformations. The method presented in this article does not have these limitations. By using a stacked shell approach, simulating all of the sheets separately using a contact model developed especially for this purpose, the method can be used to model real rotors using a fair amount of computational resources. The new method contributes significantly to the precision of virtual tests of rotors used in electric drives.

Open Access: Yes

DOI: 10.1016/j.rineng.2025.104699