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Found 6412 publications

Some remarks on comparing microgeometrical profiles and the application of replicas in microgeometrical measurements

Levente Solecki Szilvia Nagy

Publication Name: Surface Topography Metrology and Properties

Publication Date: 2018-09-25

Volume: 6

Issue: 4

Page Range: Unknown

Description:

First a method for comparing profiles given in the following considerations. The profile comparisons have to be carried out in such position, that their average distance should be the smallest possible. Helmert transform is used for fitting measured points sets to one another in geodesy so that the least square distance of the measured points would be the smallest. However, for Helmert transform corresponding point pairs are to be found, i.e. for each point of one of the profiles has to be found a nearest one on the other profile. Multiple approaches are studied for finding corresponding point to a measured point in a point set. The effectiveness of the Helmert transform and the results of profile comparison are given for profiles of rounded triangle wave shaped regular roughness standards in the most used mechanical roughness range taken by contact stylus and confocal white light optical scanner. As an application, a method for qualifying replica materials is also presented. Our method uses roughness standards of at least three different roughnesses and takes replicas of them. The inverted scanned profiles of the replicas are compared with the scanned profiles of the original surfaces. The comparison uses Helmert transform to fit the two corresponding profiles. The average distance of one of the profile point sets from the other one is calculated by determining the distance of all the points in one profile from the circles given by their three nearest measured points in the other profile. The method is also used for comparing the less noisy stylus scans and the more sensitive optical scans of the original surface in order to determine, whether the noise in the replica scans are due to the replica taking process or to the scanning.

Open Access: Yes

DOI: 10.1088/2051-672X/aadf53

Soft computing based car body deformation and EES determination for car crash analysis systems

András Rövid Pál Michelberger Peter Varlaki Annamária R. Várkonyi-Kóczy Maria Da Graça Ruano

Publication Name: Conference Record IEEE Instrumentation and Measurement Technology Conference

Publication Date: 2004-10-08

Volume: 3

Issue: Unknown

Page Range: 1674-1679

Description:

Car body deformation modeling plays a very important role in crash accident analyses, as well as in safe car body design. The determination of the energy absorbed by the deformation and the corresponding Energy Equivalent Speed can be of key importance, however their precise determination is a very difficult task. Although, using the results of crash tests, intelligent and soft methods offer a way to model the crash process itself, as well as to determine the absorbed energy, the before-crash speed of the car, etc. In this paper a modeling technique and an intelligent expert system are introduced which together are able to follow the deformation process of car bodies in car crashes and to analyze the strength of the different parts, thus significantly can contribute to the improvement of the safety of car bodies.

Open Access: Yes

DOI: DOI not available

Identification and interpretation of acausal synchronistic cognitive networks Part II. Observations via Laurens van der Post

Peter Varlaki Peter Baranyi

Publication Name: 4th IEEE International Conference on Cognitive Infocommunications Coginfocom 2013 Proceedings

Publication Date: 2013-01-01

Volume: Unknown

Issue: Unknown

Page Range: 839-850

Description:

The paper deals with the modeling and identification of the hypothetical acausal synchronistic cognitive networks concerned as 'artifacts' ('works of art') of collective 'creative' unconscious processes. This part of the paper discusses the 'joint observations' of Carl Jung and Wolfgang Pauli via interpretations of Laurens van der Post. © 2013 IEEE.

Open Access: Yes

DOI: 10.1109/CogInfoCom.2013.6719214

Faunistic and taxonomic additions to the oribatid mites (Acari, Oribatida) of Cuba

Sergey G. Ermilov Jenő Kontschán Vasiliy B. Kolesnikov Denis V. Sharapov Pavel B. Klimov

Publication Name: Acarologia

Publication Date: 2023-01-01

Volume: 63

Issue: 3

Page Range: 770-782

Description:

The present study is based on oribatid mite materials collected from leaf litter in two forest locations in Cuba. A list of 64 species, belonging to 47 genera and 31 families, is presented. Of these, one genus and two species are recorded for the first time from the Neotropical region; 17 species, one subgenus, six genera, and two families are recorded for the first time from Cuba. Two new species of the superfamily Oripodoidea—Lagenobates fossatus Ermilov and Kontschán n. sp. (Haplozetidae) and Muliercula curvilineata Ermilov and Kontschán n. sp. (Scheloribatidae)—are described.

Open Access: Yes

DOI: 10.24349/hi71-nsch

Detection of ‘Candidatus Phythoplasma prunorum’ in Apricot Trees and its Associated Psyllid Samples

Márta Ladányi M. Petróczy László Palkovics Béla Pénzes Géza Nagy László Sándor Koncz János Ágoston Piroska Gyócsi József Fail

Publication Name: Agronomy

Publication Date: 2023-01-01

Volume: 13

Issue: 1

Page Range: Unknown

Description:

‘Candidatus Phytoplasma prunorum’ is causing ever increasing economic losses through the decline of apricot trees in European countries, e.g., Hungary. In this study, the pathogen was identified from plant tissues and insects by nested-PCR. The insect species were identified via morphology and molecular methods. The incidence of the pathogen was 29.6% in randomly selected apricot trees. Most of the infected trees with symptoms died within a year. These results show that phytoplasma is significantly present and causes damage in the investigated plantations. The only known insect vector of this phytoplasma is the plum psyllid, Cacopsylla pruni, which was regularly encountered in the sampled apricot orchards and in their surroundings. In a two-year study, several adults among the sampled specimens were observed to be infected by the pathogen. This observation further confirms the role of the plum psyllid in vectoring the phytoplasma. All the sampled plum psyllid adults belonged to the ‘B’ biotype. Besides C. pruni, Cacopsylla crataegi was abundant in the samples. Several adults of the latter species were also infected by the pathogen ‘Ca. Phytoplasma prunorum’. The rates of occurrence of this phytoplasma in male and female adults of the two psyllid species appeared to be similar. The examined C. crataegi individuals showed genetic differences from each other and from specimens included in a previous investigation.

Open Access: Yes

DOI: 10.3390/agronomy13010199

Optimal protocols for quantum quenches of finite duration in the Luttinger model

Masudul Haque Ádám Bácsi Balázs Dóra Balázs Dóra

Publication Name: Physical Review B

Publication Date: 2019-06-06

Volume: 99

Issue: 24

Page Range: Unknown

Description:

Reaching a target quantum state from an initial state within a finite temporal window is a challenging problem due to nonadiabaticity. We study the optimal protocol for switching on interactions to reach the ground state of a weakly interacting Luttinger liquid within a finite time τ, starting from the noninteracting ground state. The protocol is optimized by minimizing the excess energy at the end of the quench, or by maximizing the overlap with the interacting ground state. We find that the optimal protocol is symmetric with respect to τ/2, and can be expressed as a functional of the occupation numbers of the bosonic modes in the final state. For short quench durations, the optimal protocol exhibits fast oscillation and excites high-energy modes. In the limit of large τ, minimizing energy requires a smooth protocol while maximizing overlap requires a linear quench protocol. In this limit, the minimal energy and maximal overlap are both universal functions of the system size and the duration of the protocol.

Open Access: Yes

DOI: 10.1103/PhysRevB.99.245110

On stateform of Hungary between 1920 and 1944: Applicability of the term „monarchy without a king”

Péter Takács

Publication Name: Journal on European History of Law

Publication Date: 2019-01-01

Volume: 10

Issue: 2

Page Range: 139-148

Description:

The official stateform of Hungary between 1920 and 1944 was „monarchy”. Since she did not have a king for a long time, however, it is often interpreted, even in academic analyses, in a way that it was, in fact, a kingdom with an unspecified monarch, viz without a king that could have been determined. At the level of stateforms, this ambivalent situation of a „kingless kingdom” is expressed by the category „monarchy without a king”. Some legal scholars consider this category to be one of the particular variants of monarchy, while others argue that it might be conceived at a certain point on the scale between the two main types of stateforms, namely between monarchy and republic. This paper analyzes the origin of the term „monarchy without a king”, its meaning in public law and its interpretation within the framework of Hungarian legal history. In the latter respect, it raises the questions whether the term can be used to define and characterize the Hungarian stateform in the Horthy era, and if so, what specific meaning it conveys.

Open Access: Yes

DOI: DOI not available

Gender-specific obstacles and employment disparities in the V4 countries: a study on finding the ideal workplace

József Poór Marzena Stor Imrich Antalík Łukasz Haromszeki Szonja Jenei Szilvia Módosné Szalai Zdeněk Caha

Publication Name: Regional Statistics

Publication Date: 2026-01-01

Volume: 16

Issue: 1

Page Range: 100-131

Description:

Out of the European Union’s 104 NUTS 1 (Nomenclature of Territorial Units for Statistics – Level 1) regions, those belonging to the Visegrád Group (also known as Visegrád Four or V4), have been selected for this study due to their comparable socioeconomic characteristics and regional relevance. This study aims to determine whether the obstacles to finding the right employer and job role differ between genders in the V4. These regions, through their historical background and intensive economic relations, influence not only their own territories but also the economy and value system of the entire continent. The results show significant differences between the countries in terms of the types and intensity of barriers. In Hungary, language barriers play a crucial role in restricting participation in the international labour market. In Poland, unequal access to educational opportunities is predominant. In Slovakia, the lack of flexible work arrangements tailored to family responsibilities emerged as the most significant obstacle. In certain areas of the Czech Republic, the influence of traditional gender roles was decisive. By identifying these barriers, this study contributes to understanding how gender disparities shape job-seeking experiences across the V4 countries. The research highlights that understanding the differences between countries is essential for a deeper comprehension of labour market barriers. Based on these findings, targeted measures are required, such as expanding language training in Hungary, making educational opportunities more accessible in Poland, and promoting flexible employment forms in Slovakia and less-developed areas of the Czech Republic. The results provide valuable guidance for developing policies aimed at improving gender equality and labour market participation, particularly through region-specific approaches.

Open Access: Yes

DOI: 10.15196/RS160105

Optimal parameter extraction of equivalent circuits for single- and three- phase Power transformers based on arctic puffin algorithm accomplished with experimental verification

Raphael Chenouard Mohamed Assaad Hamida Amlak Abaza Ahmed Bayomyi Ragab A. El-Sehiemy

Publication Name: Results in Engineering

Publication Date: 2025-06-01

Volume: 26

Issue: Unknown

Page Range: Unknown

Description:

The power transformer is a critical device in power systems. This paper addresses one of the major problems which hopes to enhance the accuracy of estimation of parameters, which is critical in power transformer modeling, maintenance, and operating efficiency. In that context, this work estimates the parameters of single- and three-phase power transformers by a new optimizer called Arctic Puffin Optimization Algorithm (APO). The algorithm is intended to improve estimation of transformer parameters with the goal of reducing the error incurred between the estimated and actual values of the parameters. To verify the accuracy of the APO, experimental measurements were conducted on single- and three-phase transformers. The assessment of the algorithm's effectiveness was performed against the effectiveness of other commonly used estimating methods. The results have shown that APO increases the accuracy of estimation of the parameters of both single- and three-phase transformers to considerable levels. Dependability of the APO was established by experimental verification, which disclosed an ultimate connection between the resultant quantities and actual measurements. The study also confirmed APO can be useful for transformer parameter estimation because APO converges more rapidly and more precisely compared with traditional methods of the literature.

Open Access: Yes

DOI: 10.1016/j.rineng.2025.104888