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Found 6674 publications

Application of tensor product models for vehicle de-formational processes

Istvan Harmati András Rövid Peter Varlaki

Publication Name: Proceedings of the Mini Conference on Vehicle System Dynamics Identification and Anomalies

Publication Date: 2006-12-01

Volume: Unknown

Issue: Unknown

Page Range: 615-620

Description:

Modelling of vehicle deformational processes plays an important role in car body design and accident analysis. It is a difficult task and usually carried out applying a kind of finite element method. Determination of the absorbed energy by the deformation and the corresponding energy equivalent speed (EES) can be of great importance. Exact determination or measuring of these quantities is almost impossible, so one could estimate them. In this paper we introduce a modeling technique and a model for describing the deformation process. A short description of the main idea: let we have a 3-dimensional rectangular grid on the vehicle body (or on something else). The partition is determined by taking into consideration the energy absorbing properties of the parts of the vehicle, so each cell is approximately homogenous. The cells could be identified as the entries of a tensor of order 3. We concentrate on the energy absorbed by the cells, but not on the physical coordinates of the cells. Energy absorption property (rate of the input and the absorbed energy) of a certain cell could change during the deformational process, so the absorbed energy is calculated using a monotonous decreasing function. These functions can be defined for each possible orthogonal direction of the possible impact. Instead of the original impact we deal with its orthogonal components and the result will be the sum of the particular results. The rectangular grid allows us to compute from level to level. These computations can be realized applying tensor products, the model has low complexity which can be more decreased by complexity reducing methods known from linear algebra.

Open Access: Yes

DOI: DOI not available

Grassed Tramway Tracks and Sustainable Urban Mobility: Integrating Nature-based Solutions in City Transport Infrastructure

Zoltán Major Herta Mária Czédli Cecília Szigeti L. Radácsi

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2026-01-01

Volume: 23

Issue: 1

Page Range: 271-286

Description:

Urban mobility is crucial to sustainable city development, bridging environmental preservation, economic advancement, and social equity. This paper investigates the potential of grassed tramway tracks (or green tracks) in contributing to sustainable urban mobility and aligning with the United Nations Sustainable Development Goals (SDGs). The study highlights the transformative potential of green tracks by analyzing ecological impact, carbon sequestration, and a comparative evaluation of ecological footprints. The findings emphasize their role in mitigating climate change, enhancing urban biodiversity, and promoting resilient infrastructure, positioning them as a critical solution for achieving sustainable urban development.

Open Access: Yes

DOI: 10.12700/APH.23.1.2026.1.16

Regional statistics in confined two-dimensional decaying turbulence

Gábor Tóth Gábor Házi

Publication Name: Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences

Publication Date: 2011-06-28

Volume: 369

Issue: 1945

Page Range: 2555-2564

Description:

Two-dimensional decaying turbulence in a square container has been simulated using the lattice Boltzmann method. The probability density function (PDF) of the vorticity and the particle distribution functions have been determined at various regions of the domain. It is shown that, after the initial stage of decay, the regional area averaged enstrophy fluctuates strongly around a mean value in time. The ratio of the regional mean and the overall enstrophies increases monotonously with increasing distance from the wall. This function shows a similar shape to the axial mean velocity profile of turbulent channel flows. The PDF of the vorticity peaks at zero and is nearly symmetric considering the statistics in the overall domain. Approaching the wall, the PDFs become skewed owing to the boundary layer. © 2011 The Royal Society.

Open Access: Yes

DOI: 10.1098/rsta.2011.0070

VR as a Medium of Communication: From Memory Palaces to Comprehensive Memory Management

Péter Galambos Adam B. Csapo Ildikó Horváth Peter Baranyi

Publication Name: 9th IEEE International Conference on Cognitive Infocommunications Coginfocom 2018 Proceedings

Publication Date: 2018-07-02

Volume: Unknown

Issue: Unknown

Page Range: 389-394

Description:

This paper investigates the unique potential of VR environments to serve as a comprehensive tool for communication and memory management. The paper uncovers intricate - and in some sense holistic - links between certain kinds of VR spaces and existing frameworks for the design and analysis of conceptual mappings, and shows how VR spaces can do more than just provide appealing visual experiences, by capturing the psychology of how new memories are formed. The paper provides multiple examples from the MaxWhere VR platform to support its main arguments, and concludes with a discussion on what these arguments, if accepted as correct, will mean for AI-enhanced CogInfoCom systems in the future.

Open Access: Yes

DOI: 10.1109/CogInfoCom.2018.8639896

Numerical study to investigate the thermal characteristic length with coupled CFD-FEM simulations

H. Szűcs

Publication Name: International Journal of Heat and Fluid Flow

Publication Date: 2024-04-01

Volume: 106

Issue: Unknown

Page Range: Unknown

Description:

This paper introduces a new technique for directly calculating the thermal characteristic length (Λ′) of porous materials, addressing a critical parameter required for accurate acoustic simulations during vehicle development. The proposed method offers improved practicality over existing approaches. The research seeks to overcome the limitations of current methods, proposing a coupled CFD-FEA approach within a fluid–structure interaction (FSI) simulation framework. By incorporating both fluid temperature and the fundamental definition of characteristic length, this formulation enables the direct calculation of Λ′. The validity of the method is established through specific tests conducted on ten reconstructed material samples. The proposed approach outperforms measurement techniques and established formulas, offering enhanced accuracy while overcoming the limitations of experimental repeatability. The study demonstrates the universal nature of characteristic curves across various flow regimes, ensuring consistent parameter determination under different flow conditions and sample sizes. Additionally, the research highlights the significant influence of structure deformation, regardless of flow regime, sample size, and flow direction. This paper advances the comprehension of characteristic parameters across diverse conditions by presenting a new method that enhances practicality, accuracy, and applicability to vehicle acoustic simulations.

Open Access: Yes

DOI: 10.1016/j.ijheatfluidflow.2024.109312

Colistin residues and colistin-resistant Enterobacteriaceae in agricultural soils: Sources, risks, and remediation strategies

E. Lakatos Babett Greff Miklós Posgay L. Varga

Publication Name: Environmental Research

Publication Date: 2026-03-01

Volume: 294

Issue: Unknown

Page Range: Unknown

Description:

Polymyxins, including colistin, are critical last-line antibiotics, and their environmental dissemination raises One Health concerns. This review synthesizes current evidence on the occurrence, sources, environmental fate, and mitigation of colistin residues and colistin-resistant Enterobacteriaceae in agricultural soils, with emphasis on transmission pathways to crops and implications for food safety along the farm-to-fork continuum. Principal inputs from livestock manure, reclaimed wastewater, and wildlife are characterized. Resistance mechanisms, with a focus on plasmid-mediated mobile colistin resistance (mcr), are summarized. Although animal manure may be a significant source of colistin due to its low gastrointestinal absorption, soil concentrations are low, with bioavailability influenced by physicochemical parameters, including pH, clay content, cation exchange capacity, and organic matter content. Low desorption rates limit plant uptake; thus, the primary environmental risk arises from the selection and enrichment of colistin-resistant bacteria and mcr genes in the rhizosphere, as well as splash-mediated deposition of contaminated particles. In farm and arable soils, mcr-1 and mcr-3 have been identified as the dominant variants, with higher prevalence in livestock-associated environments. Their dissemination is primarily driven by horizontal gene transfer rather than clonal expansion, influenced by factors such as soil characteristics, heavy metals, soil treatments, and plant root exudates. Interventions are critically appraised, spanning veterinary stewardship and on-farm hygiene, physical processes, chemical approaches, and biological strategies, along with postharvest barriers that include Good Agricultural Practices and Hazard Analysis and Critical Control Points, washing and sanitization, and bacteriophage biocontrol. Major conclusions are that multi-barrier, context-specific programs can reduce environmental selective pressures and interrupt gene flow while maintaining agronomic viability, yet progress remains constrained by gaps in standardized surveillance (particularly for plant-based foods), and by the limited use of quantitative risk assessment and field-scale validation of remediation technologies. A One Health framework that integrates environmental monitoring with public-health endpoints is needed to guide proportionate policy and practice.

Open Access: Yes

DOI: 10.1016/j.envres.2026.123771

Vector Preisach hysteresis modeling: Measurement, identification and application

Miklós Kuczmann

Publication Name: Physica B Condensed Matter

Publication Date: 2011-04-01

Volume: 406

Issue: 8

Page Range: 1403-1409

Description:

The paper presents a Preisach model to simulate the vector hysteresis properties of ferromagnetic materials. The vector behavior has been studied using a single sheet tester with a disk-shaped specimen at low frequency. The locus of the magnetic flux density vector has been controlled by a digital measurement system. An inverse vector Preisach hysteresis model has been developed and identified by applying the measured data. Finally, the inverse model has been inserted into a finite element procedure through the fixed point technique and the reduced magnetic scalar potential formulation to simulate the measurement system. The applicability of the measurement system as well as the developed model has been proven by comparing measured and simulated results. © 2011 Elsevier B.V. All rights reserved.

Open Access: Yes

DOI: 10.1016/j.physb.2011.01.037

Development Projects of the Modern Cities Program in Gyor

Dávid Fekete

Publication Name: Teruleti Statisztika

Publication Date: 2018-01-01

Volume: 58

Issue: 6

Page Range: 638-658

Description:

This study examines the development projects of the Modern Cities Program related to the city of Gyor, from several aspects. In the framework of the large-scale urban development program announced in 2015, the 23 Hungarian cities with county rights may benefit from its HUF 3,400 billion central budget. In the coming years, approximately HUF 120-130 billion development resources will be available to the city of Gyor. Since Gyor would be able to provide the financial resources of the development package in about 10 years from its own budget, the program is a significant additional source for the city. The development projects of the Modern Cities Program in Gyor are well suited to the city's strategic directions, serving the development of the city's transport systems, the strengthening of the university's research and development activities and the further development of the natural and built heritage of the city.

Open Access: Yes

DOI: 10.15196/TS580605

Assessing the Paradox of Autonomous Vehicles: Promised Fuel Efficiency vs. Aggregate Fuel Consumption

Balázs Horváth Dilshad Mohammed

Publication Name: Energies

Publication Date: 2024-04-01

Volume: 17

Issue: 7

Page Range: Unknown

Description:

As autonomous vehicles (AVs) continue to evolve and approach widespread adoption in the near future, the touted benefits of improved fuel efficiency at an individual level come under scrutiny when considering the overall impact on fuel consumption. This research delves into the paradoxical relationship between the promising technology of AVs, their impact on traffic capacities, travel demand, and the subsequent influence on aggregate fuel consumption. While AVs have demonstrated enhanced fuel efficiency when considered as a singular mode of transportation, our study reveals a contrasting trend when scaled to a broader societal context. Through comprehensive analysis of the literature, we discovered that, at lower limits of energy savings achievable by a single AV, the overall fuel consumption increases by a staggering 42% compared to conventional human-driven vehicles. This counterintuitive outcome is a result of the aggregate effect of increased AV usage, leading to higher traffic volumes and travel demands. Conversely, at higher thresholds of energy savings by individual AVs, the percentage of fuel consumption increment diminishes, but remains notable. Even with advanced energy-saving features, the overall fuel quantity still experiences a substantial 30% increase compared to conventional vehicles when scaled up to widespread AV use. Our findings emphasize the importance of considering the holistic impact of AVs on transportation systems and energy consumption. As society transitions towards AV-dominated traffic, policymakers and stakeholders must address the challenges associated with increased travel demand, potential traffic congestion, and the resultant implications on fuel consumption.

Open Access: Yes

DOI: 10.3390/en17071589