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Found 6414 publications

Investigation of railroad ballast particle breakage

Szabolcs Fischer Erika Juhasz

Publication Name: Pollack Periodica

Publication Date: 2019-01-01

Volume: 14

Issue: 2

Page Range: 3-14

Description:

This paper summarizes the authors up-to-date results in the research topic of railway ballast particles breakage test with individual laboratory test. In the past few years there were a lot of railway rehabilitation and maintenance project in Hungary, as well as abroad. The largest part of worlds railways has traditional superstructure, i.e. they are so called ballasted tracks. The railway ballast is the highest mass in the railways superstructure. Nowadays, it is a naturally fact that there is enough quantity of railway ballast in adequate quality. However, due to the modifications and restrictions in the related regulations since 2010, there are only few quarries in Hungary, which are able to ensure adequate railway ballast material for railway construction and maintenance projects for speed values between 120 and 160 km/h. Quarrying industry is stricken by aggravated environmental, heritage and conservation regulations year by year, it limits the accessibility of mineral wealth in significant manner. This fact with quality requirements means supply and quality risk in production of railway ballast in medium term. The main goal of authors research is to be able to simulate the stress-strain effect of ballast particles in real and objective manner in laboratory circumstances, as well as in discrete element method modeling. This paper introduces the exact assembly of executed laboratory test and newest test results. The authors summarize the up-to-date international literature review, using that they give short outlook to the planned research with research directions in near future.

Open Access: Yes

DOI: 10.1556/606.2019.14.2.1

Eddy current analysis with nonlinearity

Miklós Kuczmann Dániel Marcsa

Publication Name: Pollack Periodica

Publication Date: 2008-08-01

Volume: 3

Issue: 2

Page Range: 97-109

Description:

The paper deals with an eddy current field problem as a case study. The aim is to find the solution of the problem by the help of the Finite Element Method (FEM), and the T, , potential formulation taking the nonlinearity of the material into account. The effect of nonlinearity has been approximated with an inverse tangent type analytical model. The nonlinearity has been handled by the polarization method coupled with the Fixed-point iteration technique. © 2008 Akadémiai Kiadó.

Open Access: Yes

DOI: 10.1556/Pollack.3.2008.2.9

Analysis of the Stressed State of Sand-Soil Using Ultrasound

Szabolcs Fischer Ulf Gerber Mykola Sysyn Lukas Benedikt Schumacher

Publication Name: Infrastructures

Publication Date: 2023-01-01

Volume: 8

Issue: 1

Page Range: Unknown

Description:

The maintenance of the ballast substructure is an important cost-driver for railway systems. The problem is that today’s condition monitoring methods are insufficient to collect detailed data on the compaction and stress allocation inside the ballast bed. That makes it challenging to improve the maintenance technology and organization. This study aimed to investigate the applicability of the ultrasound method for analyzing the state of stress of sand-soil and the relation between the residual stress and wave propagation velocity. The experiments on the sand in a box with different allocations of the ultrasonic receivers and pressure measurement cells were produced under different external loading. In addition, the vertical and horizontal stress distributions were measured. The results showed a correlation between the test load, the state of stress, and the ultrasound propagation velocity. Moreover, the residual stresses after the loading cycles were analyzed.

Open Access: Yes

DOI: 10.3390/infrastructures8010004

SPECTRAL ACCELERATION FROM THE 2017 SARPOL-E ZAHAB EARTHQUAKE: PREDICTIONS AND OBSERVATIONS

Hayder AL-Hudaib R. Ibrahim Richard Ray

Publication Name: World Conference on Earthquake Engineering Proceedings

Publication Date: 2024-01-01

Volume: 2024

Issue: Unknown

Page Range: Unknown

Description:

This article investigates the spectral acceleration of the ground motion generated by the 2017 Sarpol-e Zahab earthquake, examining the spatial distribution of the observed spectra at different periods, revealing a distinct influence of source directivity. The earthquake motions were acquired by the Iranian Strong Motion Network (ISMN), and data from a total of 110 seismic stations were obtained from their network for the purpose of the present study. The regions located south of the epicenter experienced a higher spectral acceleration value compared to those sites located to the north. In addition, estimates from ground motion prediction equations (Abrahmson et al., 2014, ASK14; Akkar et al., 2014, ASB14) provided a basis for comparison. These equations predicted intensities over various distances and periods. The residual analysis results indicate that the ASB14 model provides a more accurate fit when compared to the ASK14 model for distances less than 300 km. However, for distances greater than 300 km, the ASK14 model demonstrates a better fit. The derived response spectra play a significant role in evaluating maximum response amplitudes and for seismic hazard studies. Our assessments combined PSA information with source characteristics, geology, soil conditions, and epicentral distance. The current study highlights the impacts of the 2017 Sarpol-e Zahab earthquake on the Darbandikhan Dam, which caused cracking on the road pavement along the Dam crest and horizontal and vertical displacement in some parts of the dam. Finally, the study evaluates the strong-motion distribution maps of acceleration response spectra (PSA) with 5% damping at various period intervals from (0.1 to 2.0 sec) on the dam site, which could produce the consequences observed for the dam.

Open Access: Yes

DOI: DOI not available

Scalar hysteresis measurement using FFT

Miklós Kuczmann

Publication Name: Journal of Optoelectronics and Advanced Materials

Publication Date: 2008-01-01

Volume: 10

Issue: 7

Page Range: 1828-1833

Description:

The paper deals with a possible realization of eliminating the effect of noise in scalar hysteresis measurements. The measured signals have been transformed into the frequency domain, and after applying digital filter, the spectrums of the filtered signals have been transformed back to the time domain. The proposed technique results in an accurate noise removal algorithm. The paper illustrates a fast controlling algorithm applying the inverse of the actually measured hysteresis loop, and another proportional one to measure distorted flux pattern. Developing the mentioned algorithms aims the controlling of more complicated phenomena, i.e. measuring the vector hysteresis characteristics.

Open Access: Yes

DOI: DOI not available

Issues in video-based data collection of traffic flows

Richárd Horváth Balázs Horváth Dilshad Mohammed

Publication Name: European Transport Studies

Publication Date: 2026-12-01

Volume: 3

Issue: Unknown

Page Range: Unknown

Description:

Detectors, such as object detectors and motion detectors, are increasingly promising technologies with applications across various industries, including medicine, agriculture, autonomous vehicle driving, and traffic monitoring. They offer significant advantages over traditional image classifiers. One such advantage is their ability to provide detailed and accurate records of traffic activity, crucial for transportation planning and engineering decisions, thus enhancing the safety and efficiency of transportation systems. In this article, we introduce a method utilizing a simple camera to identify moving vehicles, collect data on following distance, and measure speed, offering a low-cost solution for traffic monitoring. This approach has the potential to significantly improve traffic management in both urban and rural areas, addressing the pressing need for efficient transportation systems.

Open Access: Yes

DOI: 10.1016/j.ets.2026.100051

Big data in the food supply chain: a literature review

John G. Keogh Abderahman Rejeb Karim Rejeb

Publication Name: Journal of Data Information and Management

Publication Date: 2022-03-01

Volume: 4

Issue: 1

Page Range: 33-47

Description:

The emergence of big data (BD) offers new opportunities for food businesses to address emerging risks and operational challenges. BD denotes the integration and analysis of multiple data sets, which are inherently complex, voluminous and are often of inadequate quality and structure. While BD is a well-established method in supply chain management, academic research on its application in the food ecosystem is still lagging. To fill this knowledge gap and capture the latest developments in this field, a systematic literature review was performed. Forty-one papers were selected and thoroughly examined and analysed to identify the enablers of BD in the food supply chain. The review primarily attempted to obtain an answer to the following research question: “What are the possibilities of leveraging big data in the food supply chain?“ Six significant benefits of applying BD in the food industry were identified, namely, the extraction of valuable knowledge and insights, decision-making support, improvement of food chain efficiencies, reliable forecasting, waste minimization, and food safety. Finally, some challenges and future research directions were outlined.

Open Access: Yes

DOI: 10.1007/s42488-021-00064-0

Laser powder deposition of tool steels: Strategies leading to homogeneous parts

Lino Costa Tamás Réti R. Vilar

Publication Name: Materials Science Forum

Publication Date: 2006-01-01

Volume: 514-516

Issue: PART 1

Page Range: 739-743

Description:

The microstructure and properties of tool steel parts built by laser powder deposition (LPD) depend considerably on the build-up strategy and on the processing parameters used. This dependence can lead to inconsistent results which may limit the widespread acceptance of LPD. There is, thus, a need for efficient process optimisation tools that take into consideration the complex phase transformations that may occur during the part build-up process and their effect on final properties. A model coupling finite element heat transfer calculations with transformation kinetic theory has been developed, which allows the microstructure and property distributions in parts produced by LPD to be predicted. Application of this model to the deposition of tool steels not only explains the origin of the heterogeneous distribution of properties usually mentioned in the literature but also allows designing build-up strategies that consistently lead to homogeneous, high quality parts. Its application to the study of the influence of substrate pre-heating and idle time between the deposition of consecutive layers is illustrated in the present paper.

Open Access: Yes

DOI: 10.4028/www.scientific.net/msf.514-516.739

E-learning based distance education at szechenyi istvan university

L. Nyeki M. Kovacs Z. Letray

Publication Name: Innovations in E Learning Instruction Technology Assessment and Engineering Education

Publication Date: 2007-12-01

Volume: Unknown

Issue: Unknown

Page Range: 429-432

Description:

The paper describes our experiences of e-learning based distance education of transport engineer, engineer manager and economist students. © 2007 Springer.

Open Access: Yes

DOI: 10.1007/978-1-4020-6262-9_74