Search Everything
Tip: Search using "First Name + Last Name", e.g.
János Kiss instead of
Kiss János.
Authors - 9829
D. Bartha
26631942000
Reda Abdel-Hameed
54883057400
Desmond Neji Oben
59934691200
Norbert Perness
58198770900
Publications - 6383
Ballast Settlement Accumulation in Zones with Unsupported Sleepers
Publication Name: Transportation Infrastructure Geotechnology
Publication Date: 2024-08-01
Volume: 11
Issue: 4
Page Range: 2598-2637
Description:
The high influence of impact and vibration on the behavior of crushed stone and ballast materials has been known for a long time. The zones with unsupported sleepers, which are always present in transition zones, crossings, welds, etc., are typically characterized by impact interaction, ballast full unloading, and additional preloading. However, no studies on ballast layer settlements consider impact vibration loading. Moreover, the influence of the cyclic loading on the ballast settlement intensity is considered ambiguously, with both decelerating and accelerating trends. The comprehensive literature review presents the influence of factors on settlement intensity. The present study aims to estimate the long-term processes of sleeper settlement accumulation depending on the loading factors: impact, cyclic loading, and preloading. The typical for a void zone ballast loading pattern was determined for various void sizes and the position along the track by using a model of vehicle-track interaction that was validated by experimental measurements. The loading patterns were parametrized with four parameters: maxima of the cyclic loading, impact loading, sleeper acceleration, and minimal preloading. A specially prepared DEM simulation model was used to estimate the ballast settlement intensity after initial settlement stabilization for more than 100 loading patterns of the void zone cases. The settlement simulation results clearly show that even a low-impact loading pattern causes many times increased settlement intensity than ordinary cyclic loading. Moreover, the initial preloading in the neighbor-to-void zones can cause even a decrease in the settlement intensity compared to the full ordinary or partial unloading. A statistical analysis using a machine learning approach and an analytic one was used to create the model for the intensity prediction regarding the loading patterns. The analytic approach demonstrates somewhat lower prediction quality, but it allows to receive plausible and simple analytic equations of the settlement intensity. The results show that the maximal cyclic loading has a nonlinear influence on the settlement intensity that corresponds to the 3–4 power function, and the impact loading is expressed by the linear to parabolic function. The ballast’s minimal preloading contributes to the reduction of the settlement intensity, especially for high cyclic loadings that are typical for neighbor-to-void zones. The results of the present study could be used for the complementing of the present phenomenological equations with the new factors and further application in the algorithms of the settlements accumulation prediction.
Open Access: Yes
Progress in diagnostics of the COMPASS tokamak
V. Weinzettl
J. Seidl
R. Paprok
M. Peterka
A. Podolnik
P. Vondráček
M. Stano
T. Krizsanoczi
P. Bilková
M. Dimitrova
N. Vianello
M. Sos
J. Varju
M. Tomes
M. Varavin
M. Hron
J. Zajac
F. Zacek
M. Berta
T. Markovic
A. Devitre
M. Komm
O. Grover
P. Háček
E. Gauthier
E. Matveeva
J. Mlynar
D. Naydenkova
K. Kovarik
M. Rabinski
J. Adamek
J. Stöckel
J. Horacek
R. Pánek
R. Dejarnac
J. Havlicek
A. Havranek
R. Gomes
M. Vlainic
A. Silva
S. Zoletnik
P. Böhm
J. Cavalier
O. Ficker
M. Imrišek
G. Anda
D. Dunai
D. Refy
T. Pereira
Tsv Popov
D. Sarychev
G. P. Ermak
J. Zebrowski
M. Jakubowski
J. Krbec
S. Nanobashvili
M. Spolaore
O. Bogár
K. Mitošinková
K. Malinowski
D. Fridrich
J. P. Gunn
Publication Name: Journal of Instrumentation
Publication Date: 2017-12-07
Volume: 12
Issue: 12
Page Range: Unknown
Description:
The COMPASS tokamak at IPP Prague is a small-size device with an ITER-relevant plasma geometry and operating in both the Ohmic as well as neutral beam assisted H-modes since 2012. A basic set of diagnostics installed at the beginning of the COMPASS operation has been gradually broadened in type of diagnostics, extended in number of detectors and collected channels and improved by an increased data acquisition speed. In recent years, a significant progress in diagnostic development has been motivated by the improved COMPASS plasma performance and broadening of its scientific programme (L-H transition and pedestal scaling studies, magnetic perturbations, runaway electron control and mitigation, plasma-surface interaction and corresponding heat fluxes, Alfvenic and edge localized mode observations, disruptions, etc.). In this contribution, we describe major upgrades of a broad spectrum of the COMPASS diagnostics and discuss their potential for physical studies. In particular, scrape-off layer plasma diagnostics will be represented by a new concept for microsecond electron temperature and heat flux measurements - we introduce a new set of divertor Langmuir and ball-pen probe arrays, newly constructed probe heads for reciprocating manipulators as well as several types of standalone probes. Among optical tools, an upgraded high-resolution edge Thomson scattering diagnostic for pedestal studies and a set of new visible light and infrared (plasma-surface interaction investigations) cameras will be described. Particle and beam diagnostics will be covered by a neutral particle analyzer, diagnostics on a lithium beam, Cherenkov detectors (for a direct detection of runaway electrons) and neutron detectors. We also present new modifications of the microwave reflectometer for fast edge density profile measurements.
Open Access: Yes
A new species and a new record of Bensonella Pilsbry & Vanatta, 1900 (Gastropoda: Eupulmonata: Hypselostomatidae) from Lao Cai province, Vietnam
Publication Name: Raffles Bulletin of Zoology
Publication Date: 2026-01-01
Volume: 74
Issue: Unknown
Page Range: 31-36
Description:
In this work, a new species of Bensonella, B. didoi, is described from Lao Cai province in northern Vietnam. The new species is compared to all similar congeners and is characterised by the whitish, nearly conical shell with nine apertural barriers and a very narrow umbilicus. Following this work, the number of Bensonella species known from Vietnam becomes three, distributed in Lao Cai and Son La provinces. Additionally, B. boettgeri (Möllendorff, 1897) is reported for the first time from Vietnam, extending the distribution of the species eastwards.
Open Access: Yes
Numerical Investigation of Pre-Stressed Reinforced Concrete Railway Sleeper for High-Speed Application
Publication Name: Infrastructures
Publication Date: 2023-03-01
Volume: 8
Issue: 3
Page Range: Unknown
Description:
The current paper deals with the numerical investigation of a unique designed pre-stressed reinforced concrete railway sleeper for the design speed of 300 km/h, as well as an axle load of 180 kN. The authors applied different methodologies in their research: traditional hand-made calculations and two types of finite element software. The latter were AxisVM and ABAQUS, respectively. During the calculations, the prestressing loss was not considered. The results from the three methods were compared with each other. The hand-made calculations and the finite element modeling executed by AxisVM software are adequate for determining the mechanical inner forces of the sleeper; however, ABAQUS is appropriate for consideration of enhanced and sophisticated material models, as well as the stress-state of the elements, i.e., concrete, pre-stressed tendons, etc. The authors certified the applicability of these methodologies for performing the dimensioning and design of reinforced concrete railway sleepers with pre-stressing technology. The research team would like to continue their research in an improved manner, taking into consideration real laboratory tests and validating the results from FE modeling, special material models that allow calculation of crackings and their effects in the concrete, and so that the real pattern of the crackings can be measured by GOM Digital Image Correlation (DIC) technology, etc.
Open Access: Yes
A new species of Landouria from Thailand, with a deep umbilical groove (Gastropoda, Stylommatophora, Camaenidae)
Publication Name: Ecologica Montenegrina
Publication Date: 2025-08-15
Volume: 89
Issue: Unknown
Page Range: 161-168
Description:
Landouria canalifera Páll-Gergely, Tumpeesuwan & Tumpeesuwan sp. nov. is described from Koh Samui, southern Thailand. It is characterized by a deep groove inside the umbilicus on the last ca. 1.5 whorls, corresponding with a columellar fold in the aperture. Also, there is a basal apertural tooth, corresponding with a shallow groove on the basal side of the shell just behind the peristome. These two barriers form a shallow canal in the aperture. Although the reproductive anatomy of this new species is not known, it probably belongs to the genus Landouria, which is widespread in Thailand and in the neighboring countries.
Open Access: Yes
Time- spaces in Hungary
Publication Name: Forum Geografic
Publication Date: 2017-12-01
Volume: 16
Issue: 2
Page Range: 161-170
Description:
This paper firstly gives a general outline about the features of various spaces. Time spaces and cost spaces have non-metric characteristics, moreover, time spaces and cost spaces are not continuous. Therefore, topographic maps are not always an appropriate basis for cognitive information processing, the everyday behaviour and the study of spatial relationships. The paper demonstrates the differences between geographical space and time-spaces at two different scales, such as the road network time-space of Hungary and a district of the capital city Budapest. With the first example the rapidly changing Hungarian time-space during the last two decades can be vividly demonstrated, thanks to new motorway construction. The second example compares different types of space, as for example the difference between the time- space of a pedestrian and a vehicle.
Open Access: Yes
CBAM as a levelled playing field? Analysis of the CBAM system' economic regulatory role from the perspective of public finance and financial law
Publication Name: Rechtskultur
Publication Date: 2024-01-01
Volume: Unknown
Issue: Unknown
Page Range: 483-498
Description:
The European Union (EU) aims to reduce greenhouse gas (GHG) emissions by 55% by 2030 and achieve climate neutrality by 2050, in line with the Paris Agreement. The European Green Deal (2019) and the Fit for 55 package (2021) set legislative reforms to achieve these targets. A key element is the EU Emission Trading System (EU ETS), operating since 2005. However, increasing GHG emissions from imports prompted the adoption of the Carbon Border Adjustment Mechanism (CBAM) to address carbon leakage and level the playing field between domestic producers (paying ETS allowances) and importers (buying CBAM certificates). The CBAM is a tariff with environmental purpose and acts as an European CO2 tax, requiring importers to pay a carbon price equivalent to the EU’s internal carbon price and encouraging CO2 emission reductions. It is an equalizing system protecting EU producers and promote global adoption of green technologies. This study examines CBAM from public finance and financial law perspective, assessing its impact on global trade flows, the economic regulatory role of customs and CBAM and its impact on public revenue. The study focuses on the economies most exposed to the CBAM and the redistribution opportunities arising from ETS and CBAM system. It evaluates CBAM’s legal framework, compatibility with tax regulations, its implementation by Member States (with a case study of Hungary) and potential international disputes and adherence to World Trade Organization (WTO) rules. For Hungary, CBAM strengthens climate strategy and competitiveness in global markets. The study highlights the need for a robust legal and regulatory framework to ensure effective CBAM implementation while minimizing negative impacts. It calls for further research and international cooperation to develop comprehensive guidelines for CBAM integration into national and global policies.
Open Access: Yes
DOI: DOI not available
Asphalt layers within railway tracks’ substructure
Publication Name: Acta Technica Jaurinensis
Publication Date: 2021-11-24
Volume: 14
Issue: 4
Page Range: 612-630
Description:
For both heavy cargo Rail lines and High-Speed Lines, the railway industry continues to develop railway track design technologies. Within the past years, using an asphalt layer as a part of the railway track became so common as a support layer, it helps to reduce noise and vibration levels, reduce the thickness of the cross-sectional layers, reduce the lifetime maintenance, and many other great advantages. This paper will discuss the application of asphalt layers in railways, functionality, application fields, and types of asphalted trackbeds. Design requirements and parameters of asphalt layers, the mix design, installation process, and international experiences will be mentioned. Asphalt layers can improve the overall performance of the trackbeds and their behavior under repeated stresses of trains, the effect of asphalt layers on stress and strain ratios will be briefly discussed.
Open Access: Yes
Detection of Harmonic and Interharmonics Contents in Water Desalination Plants' Distribution System Based on Deep Learning Algorithms
Publication Name: Energy Science and Engineering
Publication Date: 2025-11-01
Volume: 13
Issue: 11
Page Range: 5451-5464
Description:
Water desalination plants are significant consumers of electric power, making them some of the largest energy users in power grids. Their electricity consumption presents an urgent challenge for efficient and sustainable operation, and they are among the most power-quality-threatening customers for utilities. This study presents three distinct strategies to enhance prediction accuracy and extend forecasting horizons, aiming to reduce algorithmic and hardware delays. Additionally, it suggests effective methods to compensate for voltage fluctuations, voltage flicker, and dips arising from desalination plants. The paper also discusses forecasting harmonics and interharmonics in current signals. Furthermore, it integrates the above techniques into a comprehensive computing system, along with an active power filter (APF) scheme, within the Simulink framework. A comparison is drawn between the performance of predictive techniques in an APF and a conventional, non-predictive APF. The proposed data augmentation method successfully increases prediction accuracy. By effectively forecasting upcoming waveforms, it reduces algorithmic and hardware delays. These techniques are designed to address multiple power quality issues simultaneously, including harmonics, interharmonics, flicker, and voltage dips, which often coexist in the spectrum as interharmonics. The suggested approach employs Long Short-Term Memory (LSTM) networks combined with the Jetson TX2 embedded artificial intelligence computer to accelerate machine learning applications. This method has proven effective in predicting and classifying time series data, including harmonics, interharmonics, and raw current signals, achieving 100% accuracy. This eliminates the need for designing specific low-pass filters. The evaluation results for this time-domain deep learning-based technique will be reported in the subsections below. The implementation is conducted in Python using the KERAS deep learning framework and TensorFlow backend, and it is evaluated on a workstation equipped with an Intel i7 processor running at 4.0 GHz and 48 GB of RAM.
Open Access: Yes
DOI: 10.1002/ese3.70251
