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Found 6273 publications

Interfacial bond strength of coloured SCC repair layers: an experimental and optimisation study

Amin Ghodousian Oveys Ghodousian Vahid Shafaie Reyes Garcia

Publication Name: Journal of Structural Integrity and Maintenance

Publication Date: 2023-01-01

Volume: 8

Issue: 3

Page Range: 140-149

Description:

This study investigates experimentally and analytically the interfacial bond strength of coloured SCC repair layers. Ten SCC mixes with 5%, 10% and 15% of blue, green or red pigments were produced to examine their fresh properties. Subsequently, 60 coloured SCC specimens were tested to assess interfacial bond strength using pull-off and push-out tests. The results confirm that pigments reduce the mechanical properties of SCC and its bond strength to concrete substrates, with red pigment reducing (by up to 41%) interfacial bond strength. It is shown that the push-out test is effective to determine the interfacial shear bond strength between the SCC repair layers and substrates. A GNNC-Modified PSO algorithm is proposed to calculate accurately (R2 = 0.95) the interfacial bond strength of coloured SCC repair layers. This study contributes towards developing more effective test methods and more accurate models to calculate interfacial bond strength of the SCC repair layers used in this study.

Open Access: Yes

DOI: 10.1080/24705314.2023.2170620

Demonstration of a more comfortable, seamless measuring setting for EEG-based experiments

Peter Szarmes Gábor Élo

Publication Name: 6th IEEE Conference on Cognitive Infocommunications Coginfocom 2015 Proceedings

Publication Date: 2016-01-25

Volume: Unknown

Issue: Unknown

Page Range: 655

Description:

Our research focuses on collecting high quality EEG signals without conductive gel and wires. During the demonstration we will show that the subject can take a normal looking cap, and then a tablet displays the EEG signals.

Open Access: Yes

DOI: 10.1109/CogInfoCom.2015.7390664

Special coginfo application by non-business organizations: Case study on marketing communication of a higher education institution

Marta Konczosne Szombathelyi Eszter Petra Majer Szabolcs Ramhap

Publication Name: 6th IEEE Conference on Cognitive Infocommunications Coginfocom 2015 Proceedings

Publication Date: 2016-01-25

Volume: Unknown

Issue: Unknown

Page Range: 483-488

Description:

The aim of this study is to prove that non-business organizations (among them the universities) - increasingly often facing the effects of lack of sources and operating in fierce competition - need to use such marketing systems and IT telecommunication technologies which are applied by profit-oriented sectors. Changes and processes in the field of information technology and telecommunications are fast, wide spread and revolutionary, even aggressive. This analysis is based upon the experiments and data of Service Centre of Széchenyi University. The key findings of this paper is the conclusion that for the higher education institution is vital for applying infocommunication tools for reaching the cognitive entities, the young generations. The paper focuses on the development of communication channels, online communication and social media, furthermore tends to give an overall picture of the rapidly growing role of social media as a tool among Hungarian higher institutions. The financial position of institutions depends more and more on customer behaviour. Customer behaviour has an influence on the higher education market; it has an effect on the choice of institution and also on future target groups. So it is significant for these institutions to pay attention to consumer expectations and communicate effectively with their consumers, using the latest and the most advanced information communication technologies. It is particularly important because the universities' target groups are mostly the Y and Z generations into whose everyday activities modern info communication technologies are embedded. In the frame of our paper we give an overview of the trends and long term features - such as digitalization, info-communication, and social media - on marketing communication tools at Széchenyi University. The case study shows the multifaceted nature of the problem, the range of possible tools and their application. Due to the labour market needs Széchenyi István University strengthens relations with the business sector and broadens the range of teaching and research services provided by them. In the case study we can follow the development of communication channels/instruments; the digital evolution and the phenomenon that the social web has become the most important (strategic) platform for communicating with the young generations; overall trends in interactive communication and online communities, and the emergence of interactive channels; social media, networks and online videos. The universities have to employ professionals with social media skills and they have to create communicating strategies for different generations. We have a real case about how younger "always online" communication professionals formulate the core requirements; and how we can integrate the communication centre with the newest info communication tools, such as mobile communication: applications. We can conclude that as the World Wide Web becomes more and more influential, social media has become the most important tool of marketing communication for universities to reach the public.

Open Access: Yes

DOI: 10.1109/CogInfoCom.2015.7390641

Product design using a contact-optimization technique

Attila Baksa Tamás Szabó István Páczelt

Publication Name: Strojniski Vestnik Journal of Mechanical Engineering

Publication Date: 2007-07-01

Volume: 53

Issue: 7-8

Page Range: 442-461

Description:

It is well known that in engineering practice high stresses occur and that these stresses depend on the shapes and the loads of the bodies in unilateral contact. The stress distribution is often not smooth and has some singularities, thereby decreasing the lifetime of the machine elements. It is an important objective to obtain a smooth stress distribution when optimizing the shape of the elements. One of the goals of this paper is to present a method that resolves the above problem. By controlling the contact pressure a prescribed, smooth contact-pressure distribution can be achieved. The optimization problems take into account the limit stress constraints of the material. In the present paper two types of contact problems are investigated. Firstly, contact optimization problems are analyzed assuming linear elasticity and small displacements, including steady-state wear process. Two numerical examples are presented on this topic for a rolling machine element: a punch optimization and a shape optimization. We also investigated which parameter values of the controlling function result in the maximum loadability. This can be useful in the design of brakes or bearings. In the second part of the paper the solution of the contact problem for large displacements and deformations is investigated where an air-spring is analyzed by calculating the nonlinear load-displacement curve and comparing it with measurements. © 2007 Journal of Mechanical Engineering. All rights reserved.

Open Access: Yes

DOI: DOI not available

Structural Integrity Analysis of 3D-Printed PLA- and ABS-Reinforced Concrete Underwater Curing †

Szabolcs Fischer Szabolcs Szalai András Lajos Nagy Hanna Csótár Gusztáv Baranyai Attila Nagy

Publication Name: Engineering Proceedings

Publication Date: 2025-01-01

Volume: 113

Issue: 1

Page Range: Unknown

Description:

The optimization and evaluation of 3D-printed polylactic acid (PLA) and ABS materials present a promising approach for enhancing the reinforcement of concrete elements, thereby advancing sustainable construction technologies. This study examines the degradation of the structural integrity of 3D-printed PLA- and ABS-reinforced concrete after 28 days of underwater curing. The research focuses on macroscopic analysis and microscopic characterization using a digital microscope and a high-resolution camera to investigate the crystalline structures formed during curing. The findings will offer valuable insights into the structural transformations occurring within concrete elements and potential interactions between concrete and PLA structures, paving the way for future civil engineering applications.

Open Access: Yes

DOI: 10.3390/engproc2025113045

Dem modeling of crushable grain material under different loading conditions

Majid Movahedi Rad M. Amine Benmebarek

Publication Name: Periodica Polytechnica Civil Engineering

Publication Date: 2021-07-13

Volume: 65

Issue: 3

Page Range: 935-945

Description:

This paper deals with the effect of contact conditions on the crushing mechanisms and the strength of granular materials. The computation of crushable grain material under different loading conditions is performed using 3D model of discrete element method (DEM). The crushable macro-grain is generated from a large number of identical spherical micro-grains which are connected according to the bonded particle model. First, the parameters of the proposed DEM model are calibrated to match the force-displacement curve obtained from Brazilian Tests performed on cylinders made of artificially crushable material. The damage profile right at the point when the force-displacement curve reaches its maximum is seen to replicate the same crack patterns observed in Brazilian test experiments. Then, parametric investigations are performed by varying the coordination number, the contact location distribution, and the contact area. The results show that these parameters play a significant role in determining the critical contact force and fracture mechanism of crushable particles compared to a traditional macro-grain crushing test. Increasing distribution and coordination number of the macro-grain increases particle strength when large area contact is permitted. However, for linear contact area, the effect of increasing coordination number on particle strength is marginal.

Open Access: Yes

DOI: 10.3311/PPci.17948

Assessment of digital maturity: the role of resources and capabilities in digital transformation in B2B firms

Marian L. Mocan Lilla Hortovanyi Anita Romanova Robert Hanak Dóra Horváth Roland Zsolt Szabó Iva Vuksanovic Herceg Dragan Djuricin Robert E. Morgan

Publication Name: International Journal of Production Research

Publication Date: 2023-01-01

Volume: 61

Issue: 23

Page Range: 8043-8061

Description:

Digital transformation is a major organisational challenge for manufacturing firms due to the extremely low success rate of such transformations to date. Capability Maturity theory suggests that firms need to develop digital transformation capability incrementally by focusing on a ‘vital few’ improvement priorities for advancing progress. The practitioner literature lacks empirical studies that validate extant capability maturity models (CMM) for digital transformation despite their importance. Moreover, there is a lack of assessment methods, and those that exist do not specify improvement points explicitly, nor prioritise them. Our research aims to address this gap through a systematic, quantitative analysis of digital capability by understanding the deployment of IT-enabled resources. Based on a sample of 302 manufacturing firms, results indicate that the digital transformation stages are punctuated by various resource-capability combinations. Results highlight that strategy- and organisation-related IT-enabled resources are the key drivers of digital transformation. We also observe that as a firm’s digital capability grows at each maturity stage, successively greater IT-enabled resources are required to support this in a stepwise function. To succeed, firms should be incentivised and supported to think beyond technology and develop five specific digital capabilities simultaneously. We also indicate the limitations that underlie our empirical work.

Open Access: Yes

DOI: 10.1080/00207543.2022.2164087

Fatigue damage analysis of pavements under autonomous truck tire passes

Richárd Nagy Mohammad Fahad

Publication Name: Pollack Periodica

Publication Date: 2022-12-31

Volume: 17

Issue: 3

Page Range: 59-64

Description:

Two different tire configurations consisting of a dual tire and a super single wide tire having different range and distribution of contact pressures have been analyzed. Along with the effect of speed on development of pavement damage at speeds of 5, 50 and 80 km h-1 under zero and uniform wander modes. Results show that at super slow speeds of 5 km h-1, at dual wheel moving at zero wander mode, decrease in fatigue life of the pavement is 3.5 years, which is 1.45 times more than the dual wheel moving at uniform wander and 3.4 times more than wide tire moving at uniform wander mode. The difference between fatigue damage at different lateral wander modes is prominent at speeds greater than 50 km h-1. A wide tire performs better than the dual wheel under zero wander configurations.

Open Access: Yes

DOI: 10.1556/606.2022.00588

Challenges of sustainable agricultural development with special regard to Internet of Things: Survey

Endre Harsányi Judit Oláh Popp József A. J. Kovács Erdei Edina Bálint Ambrus Gergely Teschner A. Nyéki M. Neményi

Publication Name: Progress in Agricultural Engineering Sciences

Publication Date: 2022-12-02

Volume: 18

Issue: 1

Page Range: 95-114

Description:

If we want to increase the efficiency of precision technologies to create sustainable agriculture, we need to put developments and their application on a new footing; moreover, a general paradigm shift is needed. There is a need to rethink close-At-hand and far-off innovation concepts to further develop precision agriculture, from both an agricultural, landscape, and natural ecosystem sustainability perspective. With this, unnecessary or misdirected developments and innovation chains can be largely avoided. The efficiency of the agrotechnology and the accuracy of yield prediction can be ensured by continuously re-planning during the growing season according to changing conditions (e.g., meteorological) and growing dataset. The aim of the paper is to develop a comprehensive, thought-provoking picture of the potential application of new technologies that can be used in agriculture, primarily in precision technology-based arable field crop production, which emphasizes the importance of continuous analysis and optimisation between the production unit and its environment. It should also be noted that the new system contributes to reconciling agricultural productivity and environmental integrity. The study also presents research results that in many respects bring fundamental changes in technical and technological development in field production. The authors believe that treating the subsystems of agriculture, landscape, and natural ecosystem (ALNE) as an integrated unit will create a new academic interdisciplinarity. ICT, emphasizing WSN (Wireless Sensor Network), remote sensing, cloud computing, AI (Artificial Intelligence), economics, sociology, ethics, and the cooperation with young students in education can play a significant role in research. This study treats these disciplines according to sustainability criteria. The goal is to help management fulfil the most important expectation of reducing the vulnerability of the natural ecosystem. The authors believe that this article may be one of the starting points for a new interdisciplinarity, ALNE.

Open Access: Yes

DOI: 10.1556/446.2022.00053