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Found 6423 publications

Domain-decomposition based H1/2 seminorm preconditioners for frictional contact problems

Lotfi Abdelhakim

Publication Name: Civil Comp Proceedings

Publication Date: 2012-01-01

Volume: 100

Issue: Unknown

Page Range: Unknown

Description:

The bilateral or unilateral contact problem with Coulomb friction between two elastic bodies is considered [1, 12]. An algorithm is introduced to solve the resulting finite element system using a non-overlapping domain decomposition method. This technique enables the transformation of the solution of the global problem to the solution of the elasticity equations for each body separately and the solution of a smaller problem for the contact surface. The solution is obtained by using a successive approximation method, in each step of this algorithm two intermediate problems are solved, the first with prescribed tangential pressure, and the second with prescribed normal pressure[11]. © Civil-Comp Press, 2012.

Open Access: Yes

DOI: DOI not available

Fuzzy Flip-Flop based Neural Networks as a novel implementation possibility of multilayer perceptrons

László Gál Rita Lovassy D. Tóth Laszlo T. Koczy Imre J. Rudas

Publication Name: 2012 IEEE I2mtc International Instrumentation and Measurement Technology Conference Proceedings

Publication Date: 2012-07-30

Volume: Unknown

Issue: Unknown

Page Range: 280-285

Description:

Fuzzy Flip-Flop based Neural Networks (FNN) constructed from fuzzy D flip-flops are studied as a novel technique to implement multilayer perceptrons. The starting point of this approach is the concept of fuzzy flip-flop (F 3), as the extension of the binary counterpart. Fuzzy D flip-flop based neurons are viewed, as sigmoid function generators. Their characteristic equations contain simple fuzzy operations, thus enabling easy implementability. FNNs have an interconnected fuzzy neuron structure composed from a large number of neurons acting in parallel which are capable of learning, and are suitable for function approximation. In this paper we propose the FPGA implementation of ukasiewicz operations, furthermore of fuzzy D flip-flop neurons based on Łukasiewicz norms. © 2012 IEEE.

Open Access: Yes

DOI: 10.1109/I2MTC.2012.6229326

A hybrid discrete bacterial memetic algorithm with simulated annealing for optimization of the flow shop scheduling problem

Olivér Hornyák Károly Nehéz Anita Agárdi Laszlo T. Koczy

Publication Name: Symmetry

Publication Date: 2021-07-01

Volume: 13

Issue: 7

Page Range: Unknown

Description:

This paper deals with the flow shop scheduling problem. To find the optimal solution is an NP-hard problem. The paper reviews some algorithms from the literature and applies a benchmark dataset to evaluate their efficiency. In this research work, the discrete bacterial memetic evolutionary algorithm (DBMEA) as a global searcher was investigated. The proposed algorithm improves the local search by applying the simulated annealing algorithm (SA). This paper presents the experimental results of solving the no-idle flow shop scheduling problem. To compare the proposed algorithm with other researchers’ work, a benchmark problem set was used. The calculated makespan times were compared against the best-known solutions in the literature. The proposed hybrid algorithm has provided better results than methods using genetic algorithm variants, thus it is a major improvement for the memetic algorithm family solving production scheduling problems.

Open Access: Yes

DOI: 10.3390/sym13071131

István Bibó's Political Ten Commandments

István Kukorelli Katalin Szoboszlai-Kiss

Publication Name: Rechtskultur

Publication Date: 2024-01-01

Volume: Unknown

Issue: Unknown

Page Range: 393-404

Description:

This article explores the historical context surrounding István Bibó, widely regarded as the most important Hungarian political thinker of the 20th century, and his analysis of moral publicity. Bibó’s work, The Ten Commandments of the Freedom-Loving Man, became a key text for intellectuals fighting against the communist regime. This text consists of ten statements reflecting important moral principles, as outlined in The Political Ten Commandments of the Freedom-Loving. Bibó wrote this during the Horthy era as a foundational document for a public initiative involving writers and activists associated with the movement. István Bibó clearly valued the moral principles of political ethics. Despite being banned, his text quickly spread through word of mouth, creating a network of intellectuals who resisted the communist regime’s oppression. Notably, this one-page document has yet to be translated into English. In our study, we trace the origins of this significant anti-communist text, written by Bibó, one of Hungary’s most influential political thinkers of the 20th century. The document presents political and moral propositions that remain timeless and relevant.

Open Access: Yes

DOI: DOI not available

Topography Pre-Treatment of Laser-Textured Surfaces for Friction Simulation in AVL Excite †

András Lajos Nagy Gabor Laki László Boros

Publication Name: Engineering Proceedings

Publication Date: 2024-01-01

Volume: 79

Issue: 1

Page Range: Unknown

Description:

This study presents the challenges arising during the numerical design and simulation of surface-microtextured piston rings. The evaluation of performance is based on the values of asperity and hydrodynamic friction, as well as the lubricant film thickness. The simulation tool AVL Excite Piston & Rings is used to perform the calculations. The aim of this study is to understand how selected surface pre-processing (pre-treatment) steps affect the calculations. Two methods are presented to achieve a realistic surface topography representative of a state after running-in. Pre-treatment is performed through metrological filtering and thresholding of the topography, and Gaussian smoothing of the virtually applied micro-texture array is carried out. The results show the anticipated behavior of decreasing asperity and hydrodynamic friction losses with the concurrent application of both techniques.

Open Access: Yes

DOI: 10.3390/engproc2024079095

Synthesis and Techno-Economic Analysis of Pyrolysis-Oil-Based Biorefineries Using P-Graph

Botond Bertok Abid H. Tanzil Anamaria Paiva Pinheiro Pires Lina Martinez-Valencia István Heckl Juan C. García-Ojeda Ferenc Friedler Manuel Garcia-Perez Andres Argoti

Publication Name: Energy and Fuels

Publication Date: 2021-08-19

Volume: 35

Issue: 16

Page Range: 13159-13169

Description:

The production of renewable fuels and chemicals is a critical component of global strategies to reduce greenhouse gas emissions. In this regard, pyrolysis oil obtained from biomass comprises hundreds of chemical compounds, thus rendering it a good precursor for manufacturing a variety of fuel products of commercial interest. Despite the large number of contributions describing the products' extraction, upgrading, and potential refining schemes, no bio-oil refinery is currently in operation. The main challenge in building a bio-oil refinery lies in the lack of an economically viable process configuration. Systematic studies comparing alternative refinery concepts, or configurations, are needed to identify the most promising configuration. To the best of our knowledge, this study is the first to use process graph (P-graph) methodology for the synthesis of pyrolysis oil refineries. In particular, this work shows the effectiveness of P-graph methodology in simultaneously calculating the profitability of various biorefinery designs by using data reported in the literature and providing information on how the introduction of new technologies to the database will impact the formation of profitable biorefinery concepts. Our work demonstrates a methodology for the addition of new unit operations to the database generated from the literature. The addition of a centrifuge for water extraction and a wet oxidation system for acetic acid production resulted in the generation of 330 biorefinery configurations, seven of which have a profitability ranging from $1,650 to $23,666/h (USD) with acetic acid and levoglucosan as the main products, respectively. This demonstrates that P-graph methodology is useful for discovering optimum techno-economic scenarios that may otherwise be overlooked.

Open Access: Yes

DOI: 10.1021/acs.energyfuels.1c01299

Identity and soccer in Corsica

Róbert Győri Szabó

Publication Name: Soccer and Society

Publication Date: 2012-01-01

Volume: 13

Issue: 1

Page Range: 36-55

Description:

For decades Corsica could be characterized as an underdeveloped, politically unstable region ridden with violence. The 'Corsican Question' is a complex phenomenon, created over time as a result of political conflict, social tension and economic maladies. Despite the establishment of administrative autonomy in 1991 and a slow transformation within the French state, coupled with new efforts for institutional reform in order to develop and strengthen Corsica's political autonomy, a successful resolution of conflict in Corsica still remains quite illusory. The most popular sport in the world could be a weapon in the hands of national or ethnic minorities against the majority nation living on the island and against the state ruled by that nation. The Corsican example points up the important connection between football, politics and the question of nations and nationalities across the world. The essay examines how soccer has been used by the Corsican minority as a field of social protest, a stage for demonstrating distinctive identity. Local football is a mirror which reflects the various unresolved questions of the difficult and complex Corsican situation - Corsican identity, relations between the island and the French state, and so on. While Corsican football and the two major Corsican clubs might not ever achieve fame or a strong position in Europe, football will remain one of the most important expressions of Corsican national identity. © 2012 Copyright Taylor and Francis Group, LLC.

Open Access: Yes

DOI: 10.1080/14660970.2012.627166

Hungary

Bence Kas Zsuzsa Forró Krisztina Zajdó

Publication Name: Managing Children with Developmental Language Disorder Theory and Practice Across Europe and Beyond

Publication Date: 2019-01-01

Volume: Unknown

Issue: Unknown

Page Range: 248-260

Description:

In the Hungarian education system, dividing children into separate groups on the basis of native language skills was first initiated in 1580 by school rector, pedagogue and evangelical priest, Pál Halvepápius, in Besztercebánya (Rosenauer, 1876). However, the foundations of speech communication have been a major interest even before that. Jesuit priest Pelbárt Temesvári (b.1435–d.1504) explored the anatomy and physiology of speech impediments in the sixteenth century and the history of the subject has remained very active ever since (Albert Szenczi Molnár, b.1574–d.1634, see Szenczi Molnár, 1610/1969; Farkas Kempelen (also known as Wolfgang von Kempelen), b.1734–d.1804, see Kempelen; 1791/1989).

Open Access: Yes

DOI: 10.4324/9780429455308

CT based analysis of reworked BGA devices

Imre Fekete István Kozma R. Csontos

Publication Name: 21st Imeko TC 4 International Symposium on Understanding the World Through Electrical and Electronic Measurement and 19th International Workshop on ADC Modelling and Testing

Publication Date: 2016-01-01

Volume: Unknown

Issue: Unknown

Page Range: 288-292

Description:

The widespread use of computed tomography in the electronic field allows for an extended range of measurements to be carried out. High integration devices can be tested easily with μCT, and provide large amount of data to characterize the technology parameters. This paper focuses on the inspection of BGA solder ball geometry and quantification of different properties of the solder arrays.

Open Access: Yes

DOI: DOI not available