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Publications - 6515

Numerical estimation method of orthotropic material properties of a roving for reinforcement of composite materials

Béla M. Csizmadia Gergely Bojtár János Égert

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2016-01-01

Volume: 13

Issue: 6

Page Range: 163-182

Description:

Knowledge of the material properties is important at machine design from composite materials. This information cannot be found in related literature and is not standard, therefore, it was necessary to determine, by measurements and by basic experiments of the mechanics of materials. This paper presents a new 3D finite element (FE) model-cell for the modeling of the material properties of a roving. By this numerical modeling method, one can determine the orthotropic and macroscopic material properties of a roving. This model-cell, models numerically, a roving, which consists of multiples of thousands of fibers that are embedded in a matrix material, as a homogenized orthotropic material. The numerical results of the material properties of the roving, can be applied to the definition of the macroscopic material properties of fiber reinforced composite laminates.

Open Access: Yes

DOI: DOI not available

Dimensioning of the reinforced concrete structures old and new presrciptions in Hungary

Csaba Kegyes

Publication Name: Proceedings of the Fib Symposium 2003 Concrete Structures in Seismic Regions

Publication Date: 2003-01-01

Volume: Unknown

Issue: Unknown

Page Range: 264-265

Description:

No description provided

Open Access: Yes

DOI: DOI not available

Automated synthesis of process-networks by the integration of P-graph with process simulation

Ákos Orosz Raymond R. Tan Jean Pimentel Ferenc Friedler

Publication Name: Chemical Engineering Transactions

Publication Date: 2020-01-01

Volume: 81

Issue: Unknown

Page Range: 1171-1176

Description:

Chemical process simulation has become one of the most important tools for the analysis of process networks. The simulation software currently available are not capable of automatically generating the process structure, the designer must provide it as an input for the simulation. This limits the contribution of simulation to the latter stages of design after the structure has been clearly defined. Since the P-graph methodology was originally conceived to generate process structures systematically, it can be used to produce the topology of the problem automatically based on rigorous combinatorial axioms and algorithms. In this work, the properties of two P-graph algorithms are exploited to automatically generate alternative structures in a commercial simulator, conferring the latter an improved capacity to assist during the early stage of design. Initially, the maximal structure generation (MSG) algorithm is employed to identify a rigorous superstructure from the initial set of plausible operating units. The solution structure generation (SSG) algorithm is then used to enumerate all combinatorially feasible processes included in the superstructure. Each process structure is individually exported to Aspen Plus®, where rigorous models are used to simulate its performance. A set of alternative processes ranked by their economic performance can be generated. This integrated methodology is employed in a case study for producing methyl lactate from methanol and lactic acid. This work demonstrates that integration of P-graph with rigorous simulation constitutes an enhanced tool for process synthesis that automates the generation of process alternatives, providing useful information and additional insight of the synthesis problem.

Open Access: Yes

DOI: 10.3303/CET2081196

Disordered eating behaviors and eating disorders among athletes

Ilona Birtalan Réka Erika Kovács Szilvia Boros

Publication Name: Orvosi Hetilap

Publication Date: 2026-05-01

Volume: 167

Issue: 19

Page Range: 746-752

Description:

Eating behavior and its disorders in sport are closely related to the development of sports nutrition and exercise physiology, as well as to performance and body ideal expectations placed on athletes. Since the late 1970s, eating disorders have received increasing public health attention, which has also extended to athletic populations. The aim of this phenomenon-centered, thematic narrative literature review is to illustrate the forms and consequences of disordered eating behaviors and eating disorders in athletic populations across different sport contexts, based on international literature published between 1980 and 2000. Based on the reviewed studies, disordered eating behaviors and eating disorders are multifactorial origin, with biological, psychological, sociocultural, and sport-specific factors all playing a role in their development. The concept of the female athlete triad proved to be a milestone; however, the involvement of male athletes has also been confirmed, particularly in weight-class and aesthetic sports. However, it should be emphasized that athlete status in itself does not uniformly imply an increased risk. Primary prevention, early detection, and multidisciplinary care are fundamentally important in preserving athletes’ health. Orv Hetil. 2026; 167(19): 746–752.

Open Access: Yes

DOI: 10.1556/650.2026.33520

Analysis and design of piles for dynamic loading

Ákos Wolf Richard Ray

Publication Name: 18th International Conference on Soil Mechanics and Geotechnical Engineering Challenges and Innovations in Geotechnics Icsmge 2013

Publication Date: 2013-01-01

Volume: 4

Issue: Unknown

Page Range: 2839-2842

Description:

With the acceptance of Eurocode 8 in Hungary a new level of seismic design is now necessary. This paper outlines some of the past history and present implementation of foundation design for seismic loading as practiced in Hungary. It shortly describes the possibilities of modeling foundations (fix support, linear elastic support, non-linear elastic support) during the design of the superstructure, and introduces the Hungarian practice. The influence of the different support's methods for the bearing forces/stresses of a superstructure is analyzed on a typical reinforced concrete office building using SAP2000 finite element software. The results of the calculation are compared through the moment of a column, the deflection and the support reaction.

Open Access: Yes

DOI: DOI not available

How Blockchain Technology Can Benefit Marketing: Six Pending Research Areas

Horst Treiblmaier John G. Keogh Abderahman Rejeb

Publication Name: Frontiers in Blockchain

Publication Date: 2020-01-01

Volume: 3

Issue: Unknown

Page Range: Unknown

Description:

The proliferation of sophisticated e-commerce platforms coupled with mobile applications has ignited growth in business-to-consumer (B2C) commerce, reshaped organizational structures, and revamped value creation processes. Simultaneously, new technologies have altered the dynamics of brand marketing, enabling a broader reach and more personalized targeting aimed at increasing brand trust and enhancing customer loyalty. Today, the Internet allows marketers to penetrate deeper into their existing markets, create new online marketplaces and to generate new demand. This dynamic market engagement uses new technologies to target consumers more effectively. In this conceptual paper, we discuss how blockchain technology can potentially impact a firm's marketing activities. More specifically, we illustrate how blockchain technology acts as incremental innovation, empowering the consumer-centric paradigm. Moreover, blockchain technology fosters disintermediation, aids in combatting click fraud, reinforces trust and transparency, enables enhanced privacy protection, empowers security, and enables creative loyalty programs. We present six propositions that will guide future blockchain-related research in the area of marketing.

Open Access: Yes

DOI: 10.3389/fbloc.2020.00003

Phase-field modeling of polycrystalline solidification: From needle crystals to spherulites - A review

Attila Szállás László Környei László Rátkai Bálint Korbuly Tamás Pusztai László Gránásy Gyula I. Tóth

Publication Name: Metallurgical and Materials Transactions A Physical Metallurgy and Materials Science

Publication Date: 2014-01-01

Volume: 45

Issue: 4

Page Range: 1694-1719

Description:

Advances in the orientation-field-based phase-field (PF) models made in the past are reviewed. The models applied incorporate homogeneous and heterogeneous nucleation of growth centers and several mechanisms to form new grains at the perimeter of growing crystals, a phenomenon termed growth front nucleation. Examples for PF modeling of such complex polycrystalline structures are shown as impinging symmetric dendrites, polycrystalline growth forms (ranging from disordered dendrites to spherulitic patterns), and various eutectic structures, including spiraling two-phase dendrites. Simulations exploring possible control of solidification patterns in thin films via external fields, confined geometry, particle additives, scratching/piercing the films, etc. are also displayed. Advantages, problems, and possible solutions associated with quantitative PF simulations are discussed briefly. © 2013 The Minerals, Metals & Materials Society and ASM International.

Open Access: Yes

DOI: 10.1007/s11661-013-1988-0

A two-step digitalization level assessment approach for manufacturing companies

Ádám Szaller Tamás Várgedő Gábor Nick Thomas Scheuer Günther Schuh

Publication Name: Procedia Manufacturing

Publication Date: 2020-01-01

Volume: 54

Issue: Unknown

Page Range: 25-30

Description:

Manufacturing companies are facing the fourth industrial revolution, which concerns itself with the real-time data-based communication and connection between cyber-physical systems and people. To initiate a successful digital transformation, many organizations turn to Industry 4.0 maturity models for orientation and advice. This paper aims to enable companies to find the model that suits them best. Therefore, several existing models are introduced and two of them, a quick-assessment model (CCMS) and a more extensive approach (Industry 4.0 Maturity Index), are described in detail. These two complementing models are combined into a new resource-efficient approach to assessing Industry 4.0 maturity.

Open Access: Yes

DOI: 10.1016/j.promfg.2021.07.005

Overview Study of the Applications of Unmanned Aerial Vehicles in the Transportation Sector †

Miklós Kuczmann Áron Ballagi Barnabás Kiss

Publication Name: Engineering Proceedings

Publication Date: 2024-01-01

Volume: 79

Issue: 1

Page Range: Unknown

Description:

This study examines the use of Unmanned Aerial Vehicles (UAVs) in transportation, focusing on traffic monitoring and accident prevention. UAVs provide a cost-effective means for traffic surveillance, route planning, and accident analysis, enhancing data accuracy and timeliness. The paper discusses autonomous and human-intervention-supported drone systems for traffic surveillance, addressing technological and operational challenges and the balance needed for practical implementation. It also presents recent advancements, including a forerunner drone model, and references research on UAVs for maritime navigation safety, underscoring the need for their safe and efficient integration into transportation systems.

Open Access: Yes

DOI: 10.3390/engproc2024079011