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Found 6327 publications

Asphalt layers within railway tracks’ substructure

Al Amir Ibrahim Al Qatamin Jehad

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

DOI: 10.14513/actatechjaur.00634

Physical Internet: A solution for the Supply Chain disruptions during the COVID-19 pandemic

Péter Németh Ben Neila Safwen

Publication Name: Acta Technica Jaurinensis

Publication Date: 2021-11-24

Volume: 14

Issue: 4

Page Range: 577-598

Description:

In this paper, we will specify our research on the impact of the COVID19 on Supply Chain Management and show up the critical issues and how the digital solution like the Physical Internet (PI, π) could solve the disruptions of production or delivery of a Supply Chain. The Physical Internet is still an emerging phenomenon in which it is intended to replace the current logistics model by encompassing new technologies such as Artificial Intelligence, Big Data, the Internet of Things (IoT), and others. This article aims to compose conceptual research to describe Supply Chain Management problems during the COVID-19 pandemic and represent the Physical Internet as a solution for this disruption based on various journal articles, papers, websites, and managers' experiences. Further, this study helps increase the understanding of scholars and practitioners on how the novel PI paradigm can solve COVID-19-induced Supply Chain disruptions. Furthermore, the Physical Internet and other modern technologies in the business world are necessary and recommended, as these current issues now require quick decisions and up-to-date knowledge.

Open Access: Yes

DOI: 10.14513/actatechjaur.00579

The impact of marketing strategy on logistics decisions and the implementation of JIT

Peter Foldesi Eszter Sós

Publication Name: Acta Technica Jaurinensis

Publication Date: 2021-11-24

Volume: 14

Issue: 4

Page Range: 364-376

Description:

Marketing has a significant impact on logistics systems and corporate performance, so it is nowadays necessary to define a marketing logistics strategy in the lives of larger companies so that logistics decisions are not distorted by the marketing strategy. According to the current direction of development, smaller and smaller quantities of goods are constantly being moved, with ever shorter deadlines. Therefore, companies prefer to use the Just In Time (JIT) system, which results in a gradual reduction in inventory costs, but increases the burden on the environment. In this article, we analyze the interaction between marketing and logistics and the logistics environment required to implement a JIT system. For research we have used the matrix of Quality Function Deployment (QFD) technique to evaluate the needs of the customer with respect to the JIT system, thus clarifying the logistics strategy applicable to the introduction of the specific product.

Open Access: Yes

DOI: 10.14513/actatechjaur.00597

Integration of BIM in architecture and structural engineering education through common projects

T. Horváth János Szép Kitti Karolyfi Dóra Szalai

Publication Name: Acta Technica Jaurinensis

Publication Date: 2021-11-24

Volume: 14

Issue: 4

Page Range: 424-439

Description:

Building Information Modeling (BIM) is one of the most significant developments in architecture and civil engineering in recent years, therefore it becomes increasingly important to promote its integration into university education. Currently, several universities worldwide offer BIM courses in architecture and civil engineering programs, while many others are under the process of integrating BIM into their curricula. The goal of this research is the implementation of BIM into higher education (Széchenyi István University, Hungary) by integrating the architectural, structural, and mechanical engineering disciplines. An important advantage of the university is that the architecture and civil engineering programs belong to the same faculty, which allows students to work together on common projects. A new course was performed in the previous semester, in which the students are designing contemporary buildings as case studies. In this paper, the results of the integration process are presented and evaluated based on the trainers’ and students’ experiences.

Open Access: Yes

DOI: 10.14513/actatechjaur.00641

Analysis of vehicle-pedestrian and bicyclist conflicts in Győr-Hungary using Swedish conflict technique

A. Kizawi

Publication Name: Acta Technica Jaurinensis

Publication Date: 2021-11-24

Volume: 14

Issue: 4

Page Range: 377-405

Description:

Increasing traffic volumes leads to changes in traffic conditions, especially at intersections. These changes affect the ability of Vulnerable Road Users (VRUs) such as pedestrians and bicyclists to cross the road safely, especially at un-signalized crossings (without traffic lights), where many road users are conflicting at the same point of the road and neglecting 'in some cases' the priority issue. Although the emphasis on pedestrian safety has recently increased, there is still a need to analyze the causal factors of VRUs accidents and define their relationship to road design characteristics. This paper presents a study bout vehicle – pedestrian and bicyclist conflicts analysis using Swedish conflict technique at three un-signalized pedestrian crossings in the city of Győr-Hungary, where some pedestrian accidents were happened between 2014 and 2018, and reported based on accidents database in Hungary. The aim is to analyse vehicle-pedestrian and bicyclist interactions, and evaluate the severity of conflicts with the help of the Swedish technique graph. The findings concluded that there is a compatibility between Swedish conflict technique and accident records with regard to conflicts severity and the probability of accidents occurrence.

Open Access: Yes

DOI: 10.14513/actatechjaur.00605

Review of the effect of sand on the behavior of expansive clayey soils

Ammar N. Alnmr R. P. Ray

Publication Name: Acta Technica Jaurinensis

Publication Date: 2021-11-24

Volume: 14

Issue: 4

Page Range: 521-552

Description:

Clayey soils often showed undesirable engineering behavior such as low bearing capacity, swelling and shrinkage characteristics. However, chemical improvement, thermal improvement and improvement by additives like lime, cement and sand offer an efficient technique to overcome the problems resulting from Expansive soils. This paper presents a review of the swelling behavior of sand-clay mixtures as well as the effect of sand on the physical and mechanical characteristics of expansive soils. Results highlight the importance of sand in improving the behavior of expansive soils. Finally, the most important general conclusions about the behavior of expansive soils and suggestions for future researches are highlighted.

Open Access: Yes

DOI: 10.14513/actatechjaur.00611

Material Models to Study the Effect of Fines in Sandy Soils Based on Experimental and Numerical Results

Ammar N. Alnmr

Publication Name: Acta Technica Jaurinensis

Publication Date: 2021-11-24

Volume: 14

Issue: 4

Page Range: 651-680

Description:

Choosing and calibrating a robust and accurate soil material model (constitutive model) is the first important step in geotechnical numerical modelling. A less accurate model leads to poor results and more difficulty estimating true behaviour in the field. Subsequent design work is compromised and may lead to dangerous and costly mistakes. In this research, laboratory experimental results were used as a basis to evaluate several soil material models offered in Plaxis2D software. The deciding feature of the soil model was how well it could represent effects of percentage of fine material within sandy soils to simulate its behaviour. Results indicate that the Hardening Soil (HS) model works well when the percentage of fine (soft) materials is less than 10%. Above that level, the Soft Soil model (SS) becomes the most suitable. Finally, some important conclusions about this research and recommendations for future research are highlighted.

Open Access: Yes

DOI: 10.14513/actatechjaur.00625

Possibilities of porous-structure representation – an overview

Balázs Vehovszky H. Szűcs

Publication Name: Acta Technica Jaurinensis

Publication Date: 2021-11-24

Volume: 14

Issue: 4

Page Range: 553-576

Description:

Porous media can be found in all areas of scientific life, such as medicine, civil engineering, material science, fluid dynamics. Computing has achieved high efficiency and computational capacity – so far. However, three-dimensional Computational Fluid Dynamics (CFD) simulations of microstructure remain significant challenges. Pore-scale simulations can help understand the physical processes and determine macroscopic parameters such as the high-frequency limit of dynamic tortuosity, viscous, and thermal characteristic lengths. Independent of whether the computational problem is two or three-dimensional, the geometry as input parameter must be prepared. For this reason, geometry representation methods play a crucial role in the analysis at the pore-scale, especially in numerical simulations. In this article, an insight into microstructures’ visualization capabilities is provided essentially for CFD simulations.

Open Access: Yes

DOI: 10.14513/actatechjaur.00591

Methods to detect and measure scour around bridge foundations

Muhanad Al-Jubouri R. P. Ray

Publication Name: Acta Technica Jaurinensis

Publication Date: 2021-11-24

Volume: 14

Issue: 4

Page Range: 631-649

Description:

Bridges are indispensable structures vital to the operation of road and rail transportation networks. Crossing rivers and artificial waterways, however, presents a risk to their foundations due to scour actions. Scour is the number one cause for bridge failures and may occur beneath any bridge, large or small, with supports located within the waterway. This paper provides a summary of present scour detection and measurement equipment and associated assessment methodologies. In this regard, particular emphasis is placed on structural health monitoring better to evaluate the presence and influence of potential scour. A Sensitivity Analysis on a newly introduced monitoring system is also assumed. Furthermore, much research has been undertaken to create a technology that can instantly identify and detect bridge scour, improving survey reliability through prior inspection and prompt intervention. This research will explore and evaluate bridge scour detection methods employed and suggest a possible path for developing the detection system to identify scour depth effectively and efficiently. Finally, our key aim is to minimize human effort in identifying and bridge scour by using a quick, easy-to-use, cost-effective process, resulting in fewer injuries and economic savings.

Open Access: Yes

DOI: 10.14513/actatechjaur.00626