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Found 6278 publications

Edge finite element method in case of high frequency simulations

Miklós Kuczmann Gergely Friedl

Publication Name: Pollack Periodica

Publication Date: 2015-10-01

Volume: 10

Issue: 3

Page Range: 59-70

Description:

The paper deals with high frequency simulations with edge finite element method realized with PETSc functions. The weak formulations of the high frequency simulations are derived from Maxwell's equations in frequency domain. To reduce the calculation time, the finite element method was implemented in PETSc environment. The realized simulation environments were validated with simple examples, which analytically can be calculated.

Open Access: Yes

DOI: 10.1556/606.2015.10.3.7

Examining the Determinants of Pedestrian Safety Risks in the Bangkok Metropolitan Region, Thailand

Pawinee Iamtrakul Attila Borsos Sararad Chayphong

Publication Name: Sage Open

Publication Date: 2025-10-01

Volume: 15

Issue: 4

Page Range: Unknown

Description:

Transportation systems are complex and multimodal, comprising diverse travel modes that often compete for limited roadway space. However, the diversity of these modes also generates varying levels of exposure and vulnerability, particularly among pedestrians, who represent the most at-risk group of road users. This study investigates the determinants of Pedestrian Safety (PS) within the Bangkok Metropolitan Region (BMR), focusing on behavioral, and environmental risk factors. Data was collected through a structured questionnaire distributed to 1,120 participants who had encountered potentially hazardous situations while walking. Ordinal logistic regression was used to examine the multifaceted influences shaping pedestrian risk behaviors across three user groups: (1) the general pedestrian population, (2) predominant pedestrian mode users, and (3) individuals with prior pedestrian accident experiences. The findings reveal that physical environmental characteristics and perceived behavioral control, particularly the availability and condition of pedestrian-supportive facilities have significant effects on risk-related behaviors. These results highlight the need for a comprehensive and context-sensitive approach to understanding pedestrian risk and for developing targeted interventions and strategic plans aimed at preventing pedestrian-related crashes in rapidly urbanizing environments.

Open Access: Yes

DOI: 10.1177/21582440251398603

Is environmental information disclosure driving green energy development? Contextual evidence from Chinese city level data in the lens of sustainability

Laszlo Vasa Elżbieta Wolanin Jian Liu Irum Shahzadi Ximeng Liu

Publication Name: Renewable Energy

Publication Date: 2024-12-01

Volume: 237

Issue: Unknown

Page Range: Unknown

Description:

As an important supplement to mandatory environmental regulation, third-party participation in environmental regulation has become an important driving force for the comprehensive green transformation of economic and social development. Environmental information disclosure (EID) has become a widely used form of third-party participation ecological regulation, and the study of its impact on green energy development (GED) is receiving more and more academic attention. However, the research on this issue is still insufficient in academia. Based on resource-based theory and information processing theory, with IPE project of pollution information survey in China as an exogenous impact, this paper analyzes the causal impact of EID for GED using panel data of 285 Chinese cities from 2000 to 2020. The findings revealed that EID is a strong driver of GED in the long run, further amplified by the smart city pilot program. Besides, industrial structure transformation (IST), substantive green technological innovation (SGTI), non-substantive green technological innovation (NOSGTI), and green finance development (GFD) are important mediating mechanisms through which EID facilitates the GED. Concerning resource endowments of different regions and cities, the heterogeneity test asserted that the promotion effect of EID for GED is best in resource-based cities and old industrial parks. These results emphasize the importance of public participation in urban sustainable development and provide new ideas for promoting green growth.

Open Access: Yes

DOI: 10.1016/j.renene.2024.121702

Statistical approach for designing generic 18650 battery model

Adrienn Dineva István Lakatos Krisztian Horvath Szabolcs Kocsis Szurke

Publication Name: 2021 17th Conference on Electrical Machines Drives and Power Systems Elma 2021 Proceedings

Publication Date: 2021-07-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

Most battery models are designed by estimating its parameters of one or two different cells. During simulations, these models perform satisfactorily and produce results very close to reality. The problem occurs when measurements are conducted with cells from different manufacturers and large variations are observed during the dynamic loads. The purpose of this paper is to design a general model for 18650 designed batteries, which provides as little deviation as possible when using different cell types. To establish the general model, constant load, transient, and dynamic load tests on 8 different cells are performed. An Ordered Weighted Averaging operator is used to standardize the measurement results and determine the model parameters. Outliers are filtered out using the weight parameter. To create the battery model a two-time-constant circuit model is used in MATLAB Simulink. Worldwide Harmonized Light Vehicle Test Procedure (WLTP) tests are used to validate the results.

Open Access: Yes

DOI: 10.1109/ELMA52514.2021.9503034

Optimizing industrial robot selection using novel trigonometric Pythagorean fuzzy normal aggregation operators

Dragan Pamucar Nasreen Kausar Murugan Palanikumar Vladimir Simic

Publication Name: Complex and Intelligent Systems

Publication Date: 2025-10-01

Volume: 11

Issue: 10

Page Range: Unknown

Description:

The modern world uses an increasing number of robots, notably service robots. Robots will be able to easily manipulate everyday objects in the future, but only if they are paired with planning and decision-making procedures that allow them to comprehend how to complete a task. This research presents new techniques to handling multi-attribute problem solving with trigonometric Pythagorean normal fuzzy numbers. The sine trigonometric Pythagorean fuzzy sets combine the concept of Pythagorean fuzzy sets with sine trigonometric functions to represent uncertainty in decision-making. It is feasible to combine trigonometric Pythagorean fuzzy numbers and normal fuzzy numbers to get trigonometric Pythagorean fuzzy normal numbers. In addition to the fundamental interaction aggregation operators, we define the trigonometric Pythagorean fuzzy normal numbers. The trigonometric Pythagorean fuzzy normal numbers satisfy the following properties: associative, distributive, idempotent, bounded, commutative and monotonicity. Four novel approaches are introduced such as weighted averaging, weighted geometric, generalized weighted averaging and generalized weighted geometric. These operators can be used in the development of a multi-attribute decision-making algorithm. We demonstrate how improved Euclidean and Hamming distances are used in practical situations. For industrial robots, the two most crucial elements are computer science and machine tool technology. The four criteria of weights, orientations, speeds and accuracy may be used to assess robotic systems. They are also more practical, easier to understand, and more adept at identifying the best answer more quickly. The effectiveness and accuracy of the models we are looking at are demonstrated by comparing many existing models with those that have been developed.

Open Access: Yes

DOI: 10.1007/s40747-025-02083-5

The palace of the Hungarian Academy of Sciences as national monument

Gábor Winkler

Publication Name: Epites Epiteszettudomany

Publication Date: 2015-09-01

Volume: 43

Issue: 3-4

Page Range: 169-180

Description:

The lecture presented on the conference of the Hungarian Academy of Sciences showed interesting facts about the significance of the building and about the past of its maintenance as national monument. According to many opinions the palace of the Hungarian Academy of Sciences is the second most significant public building of Hungary. The first neo-Renaissance building of Budapest was erected in the style of Historicism, which tendency has decisively defined the townscape up to this time (Fisherman's Bastion, Buda Castle). Historicism appeared in Hungary at the beginning of the 1860s following Neo-Classicism and parallel with Romantic architecture: at first with neo-Renaissance characteristics, but later the neo-Gothic, neo-Romanesque and neo-Baroque architecture emerged as well. The presentation analysed the sources of the Hungarian laws about monument preservation, the functions of the building as monument. The palace has a significant role also as historical place and artistic relic. The lecture also presented the spatial arrangement of the building, its rich fine arts collection, its defining stylistic characteristics, and the process of restoration after the damages in World War II.

Open Access: Yes

DOI: 10.1556/096.2015.43.3-4.4

Improvement of the cantilever test geometry deflection measurement method to assess residual stresses in laser powder bed fusion

István Hatos

Publication Name: Production Engineering Archives

Publication Date: 2025-12-01

Volume: 31

Issue: 4

Page Range: 474-480

Description:

Laser powder bed fusion (L-PBF) processes allow for the creation of advanced 3D parts that are difficult to achieve through conventional manufacturing. Defects such as part deformation are a critical issue in L-PBF and seriously affect the industrial adoption of metal additive manufacturing (AM) processes for critical applications. The research community has widely accepted the deformation measurement of known geometries, such as cantilevers or bridges, for the assessment of residual stresses. In this study, quantitative measurements are obtained using a 3D optical scanner on cantilevers with different geometries, in order to study the effect of bar thickness on deformation. Furthermore, this experimental study aims to investigate cantilever deflection measurement methods and compare the obtained deviation parameters. The findings reveal that, in case of cantilever specimens, flatness and curvature attributes measured on surface are more reliable than maximum vertical deflection. The part height plays a primordial role on the deflection, the distortion changes in inverse proportion to the cantilever’s bar thickness.

Open Access: Yes

DOI: 10.30657/pea.2025.31.44

Thermo-mechanical reliability-based topology optimization for imperfect elasto-plastic materials

Majid Movahedi Rad Muayad Habashneh Cucuzza Raffaele Habashneh Muayad Fathnejat Hamed Domaneschi Marco

Publication Name: International Journal of Mechanics and Materials in Design

Publication Date: 2025-12-01

Volume: 21

Issue: 6

Page Range: 1755-1776

Description:

This work presents an innovative framework for thermoelastic-plastic reliability-based topology optimization, tackling challenges related to material uncertainties, geometric imperfections, and variations in volume fractions. An enhanced Bi-directional Evolutionary Structural Optimization (BESO) method is developed. It integrates thermoelastic-plastic finite element analysis with stochastic reliability constraints to achieve robust and efficient structural designs under combined thermal and mechanical loading. The framework incorporates advanced modeling techniques, including temperature-dependent material properties, elasto-plastic behavior, and eigenmode-based imperfection modeling. A key innovation lies in formulating reliability constraints by treating volume fraction as a random variable to model material usage uncertainty. This ensures compliance with target safety indices. The proposed methodology is verified through detailed numerical examples, including steel beam and shell structures subjected to temperatures up to 800 °C. Results show that the probabilistic designs achieved up to 30% higher load-bearing capacity compared to deterministic ones and demonstrated improved stress distribution and thermal resilience. These enhancements confirm the method’s effectiveness in achieving optimal layouts that balance material efficiency, structural stability, and reliability.

Open Access: Yes

DOI: 10.1007/s10999-025-09799-9

EStreams: An integrated dataset and catalogue of streamflow, hydro-climatic and landscape variables for Europe

Ruud van der Ent Marvin Höge Thiago V.M. do Nascimento Máté Chappon Julia Rudlang Jan Seibert Fabrizio Fenicia Markus Hrachowitz

Publication Name: Scientific Data

Publication Date: 2024-12-01

Volume: 11

Issue: 1

Page Range: Unknown

Description:

Large-sample hydrology datasets have become increasingly available, contributing to significant scientific advances. However, in Europe, only a few such datasets have been published, capturing only a fraction of the wealth of information from national data providers in terms of available spatial density and temporal extent. We present “EStreams”, an extensive dataset of hydro-climatic variables and landscape descriptors and a catalogue of openly available stream records for 17,130 European catchments. Spanning up to 120 years, the dataset includes streamflow indices, catchment-aggregated hydro-climatic signatures and landscape attributes (topography, soils, geology, vegetation and landcover). The catalogue provides detailed descriptions that allow users to directly access streamflow data sources, overcoming challenges related to data redistribution policies, language barriers and varied data portal structures. EStreams also provides Python scripts for data retrieval, aggregation and processing, making it dynamic in contrast to static datasets. This approach enables users to update their data as new records become available. Our goal is to extend current large-sample datasets and further integrate hydro-climatic and landscape data across Europe.

Open Access: Yes

DOI: 10.1038/s41597-024-03706-1