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Found 6374 publications

Inelastic tunneling through normal and superconducting junctions in the presence of a photonic bath within the Lindbladian formalism

Rok Žitko Ádám Bácsi

Publication Name: Physical Review A

Publication Date: 2024-07-01

Volume: 110

Issue: 1

Page Range: Unknown

Description:

An electron tunneling across a junction integrated into an electric circuit can generate an excitation in the photonic field (electromagnetic environment) and lose energy in the process. Such inelastic tunneling of particles is commonly described using the P(E) theory. In the conventional approach to this theory, the tunneling rate and the electric current through the junction are derived using Fermi's golden rule and by averaging over the environmental photonic degrees of freedom. In this work, we address the same problem of inelastic tunneling due to photonic environment in Lindbladian formalism and we present how the photonic degrees of freedom are traced out in the quantum master equation approach. The resulting quantum master equation is parametrized by the same P(E) function and enables us to obtain not only the electric current but various other quantities, for instance, the heat current, in a systematic and convenient way. We also demonstrate that the Lindbladian formalism provides a comprehensive description of Bogoliubov quasiparticle tunneling through superconducting junctions and that it properly accounts for the coherence factors. The coherence factors become important if the normal-state density of states is particle-hole asymmetric.

Open Access: Yes

DOI: 10.1103/PhysRevA.110.012224

Introduction of simulation method and possibilities of standardisation

No authors available

Publication Name: International Workshop on Modeling and Applied Simulation, MAS 2009, Held at the International Mediterranean and Latin American Modeling Multiconference, I3M 2009

Publication Date: 2009-01-01

Volume:

Issue:

Page Range: 224-231

Description:

The paper focuses on the applicability of simulation technology in several hierarchical levels of a production oriented industrial firm. The topic of the paper addresses the discrete event simulation technology which is used to model the material flow and the manufacturing processes in the company. This paper would like to show some practice experience about the industrial introduction steps of manufacturing simulation, as well as our recent research result in the field of standardized simulation model building and data handling procedure.

Open Access: No

DOI: DOI not available

Developing fuzzy cognitive maps for modeling regional waste management systems

No authors available

Publication Name: Civil-Comp Proceedings

Publication Date: 2009-01-01

Volume: 92

Issue:

Page Range: Unknown

Description:

Sustainable waste management systems necessarily include environmental, economic, social, institutional, legal and technical aspects. As a result of the incompleteness and multiple uncertainties occurring in sustainable waste management systems, we propose the use of fuzzy cognitive maps (FCM) to support the planning and decision making process. It is obvious that uncertainties involved with waste management represent vagueness rather than probability. Fuzzy sets and fuzzy logic are suitable to construct a formal description and a mathematically manageable model of systems and processes with such uncertainties. In the research described in this paper the FCM model of the Gyor RWMS is established and implemented in such a structure that its parameters and weights were flexibly variable. By observation of the model and its time dependent behaviour we determined under what conditions the long-term sustainability of a regional waste management system could be ensured. In this paper, the interpretation of the results obtained by the FCM model for the actual waste management system are presented. © Civil-Comp Press, 2013.

Open Access: No

DOI: DOI not available

Production process modeling and planning wih simulation method, mounting process optimisation

No authors available

Publication Name: International Workshop on Modeling and Applied Simulation, MAS 2009, Held at the International Mediterranean and Latin American Modeling Multiconference, I3M 2009

Publication Date: 2009-01-01

Volume:

Issue:

Page Range: 240-245

Description:

The paper focuses on the establishment of the production program using simulation technology in a structure, where several products and high amount of variants per product are produced. The topic of the paper addresses the discrete event simulation technology which is used to model the material flow and the manufacturing processes in the production area. This paper would like to show and describe the modelling steps of a complex production system with a lot of products and three different line parts, which are connected with buffers.

Open Access: No

DOI: DOI not available

Small and silly? or private pitfall of small and medium-sized enterprises

No authors available

Publication Name: World Academy of Science, Engineering and Technology

Publication Date: 2009-01-01

Volume: 37

Issue:

Page Range: 482-488

Description:

Knowledge and these notions have become more and more important and we speak about a knowledge based society today. A lot of small and big companies have reacted upon these new challenges. But there is a deep abyss about knowledge conception and practice between the professional researchers and company -life. The question of this research was: How can small and mediumsized companies be equal to the demands of new economy? Questionnaires were used in this research and a special segment of the native knowledge based on economy was focused on. Researchers would have liked to know what the sources of success are and how they can be in connection with questions of knowledge acquisition, knowledge transfer, knowledge utilization in small and medium-sized companies. These companies know that they have to change their behaviour and thinking, but they are not on the suitable level that they can compete with bigger or multinational companies. © 2009 WASET.ORG.

Open Access: No

DOI: DOI not available

A New Strategic Marketing Management Model for the Specificities of E-Commerce in the Supply Chain

Laszlo Vasa Yuriy Bilan Balázs Gyenge Imre Vida Zoltán Máté

Publication Name: Journal of Theoretical and Applied Electronic Commerce Research

Publication Date: 2021-07-01

Volume: 16

Issue: 4

Page Range: 1136-1149

Description:

The study seeks to answer the question of what strategic directions and opportunities we have for business in the midst of the info-communication changes of our time. In this research, we compare the results of non-representative primary research (cluster analysis and discriminant analysis) with the factors and latest methods of e-commerce or even mobile commerce and traditional commerce and their main differences. Based on the four clusters examined, we develop a new strategic model for practice with suggestions which can be used by small and medium-sized enterprises (SMEs) and which they can incorporate directly into their business models. Starting point of our hypothesis was that in order to develop an effective and delivered communication, a market needs to be targeted and at least four different clusters should be formulated.

Open Access: Yes

DOI: 10.3390/jtaer16040064

A Species-Specific PCR Differentiates Two Causal Agents of Hazel Powdery Mildew and Reveals the Occurrence of Erysiphe corylacearum

Márk Z. Németh János Ágoston Klementina Kalmár Katalin Borostyán Éva Preininger Orsolya Molnár

Publication Name: Horticulturae

Publication Date: 2024-07-01

Volume: 10

Issue: 7

Page Range: Unknown

Description:

The demand for common hazel (Corylus avellana) fruit increases constantly. Powdery mildew (PM) on hazels in Hungary and throughout Europe was previously caused mainly by Phyllactinia guttata. However, less than a decade ago, another fungus of Asian origin, Erysiphe corylacearum, appeared on hazels in Europe, including Hungary. Our investigation aimed to develop a species-specific PCR (ssPCR) to aid the identification of P. guttata and E. corylacearum, and to assess the presence of the latter, non-native fungus in Hungary. For this study, 59 samples were collected from Hungary between 2021 and 2023. The chasmothecial morphology of the PM fungi was observed, and the internal transcribed spacer (ITS) of ribosomal DNA was sequenced in representative samples. Morphological analysis distinguished two types of chasmothecia. Parts of the chasmothecia, typical of P. guttata, were flattened and spherical with bristle-like appendages, while other chasmothecia, characteristic of E. corylacearum, were distinctly smaller, bearing appendages with branched apices. Sequence data also verified the presence of P. guttata and E. corylacearum in our samples. The developed ssPCR revealed that E. corylacearum was present in more than three-quarters of the samples, more than a quarter of the samples contained both fungi and about one-fifth carried solely P. guttata. The alien fungus E. corylacearum was found in all but one of the sampled regions and was found on C. avellana and also on C. colurna. Erysiphe corylacearum spreads rapidly and can be considered an invasive pathogen. Its practical importance lies in its ability to infect hazelnuts, potentially causing economic losses. Our ssPCR ensures accurate and quick identification of the fungus, which is essential for effective plant protection.

Open Access: Yes

DOI: 10.3390/horticulturae10070763

Jung- Kerényi - Pauli and the cognitive individuation Part I: Laurens van der Post and the three hidden pillars of the world

Peter Varlaki Péter Baranyi

Publication Name: 5th IEEE International Conference on Cognitive Infocommunications Coginfocom 2014 Proceedings

Publication Date: 2014-01-23

Volume: Unknown

Issue: Unknown

Page Range: 629-635

Description:

This part of the paper on the basis of C.G. Jung's 'Personality and Psychological Types' discusses the problems of a more differentiated system structure and dynamic process, outlining Jung's cognitive ('info-communicative') 'individuation process' suggested by W. Pauli in a partly conscious and partly unconscious cooperation with Jung together, on a possible basis of the dynamic processes' of the mythologems described by Kerényi in a 'system-theoretical manner', taking into account the modern 'control paradigms', as well.

Open Access: Yes

DOI: 10.1109/CogInfoCom.2014.7020418

Applicability of fuzzy flip-flops in the implementation of neural networks

No authors available

Publication Name: 9th International Symposium of Hungarian Researchers on Computational Intelligence and Informatics, CINTI 2008

Publication Date: 2008-12-01

Volume:

Issue:

Page Range: 333-344

Description:

The concept of various type fuzzy flip-flops (F3) has already been proposed. We have done some investigations on a large scope of F 3s based on different t-norms and conorms. Also we have shown that a few F3 types are suitable for realizing neurons in multilayer perceptrons. The aim of this paper is to present a comparison of the performance of several type neural networks based on fuzzy J-K and also fuzzy D flip-flops (the latter derived from the former type). The behavior of algebraic, Yager, Dombi and Hamacher type fuzzy flip-flop neural networks are presented. The best fitting t-norm and corresponding fuzzy flip-flop type will be presented in terms of function approximation capability.

Open Access: No

DOI: DOI not available