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Found 6427 publications

Investigation of the Bearing Capacity of Transport Constructions Made of Corrugated Metal Structures Reinforced with Transversal Stiffening Ribs

Szabolcs Fischer Vitalii Kovalchuk Mykola Sysyn Majid Movahedi Rad

Publication Name: Infrastructures

Publication Date: 2023-09-01

Volume: 8

Issue: 9

Page Range: Unknown

Description:

Methods of increasing the bearing capacity of corrugated metal structures of transport constructions using transversal stiffening ribs in the form of additional corrugation and stiffeners are given. Based on the theory of elasticity, a mathematical model for estimating the stress-strain state of transport constructions made of corrugated metal structures reinforced with stiffening ribs in the form of double corrugation was developed. The method of determining equivalent forces during rolling stock passage is offered. It has been established that double corrugation increases the bearing capacity of corrugated metal structures. Therefore, additional corrugation of corrugated metal structures reduces stresses by up to 20% and deflections by 50%. The obtained results show that the increase in rolling stock speed does not lead to a significant increase in stresses and strains in CMS when the railway track corresponds to the design state.

Open Access: Yes

DOI: 10.3390/infrastructures8090131

On Metrics Used in Colonoscopy Image Processing for Detection of Colorectal Polyps

Raneem Ismail Szilvia Nagy

Publication Name: Smart Innovation Systems and Technologies

Publication Date: 2021-01-01

Volume: 216

Issue: Unknown

Page Range: 137-151

Description:

Colorectal cancer is nowadays the fourth cause of cancer death worldwide. Prevention of colorectal cancer by detection and removal of early stage lesions is of essential importance and has become a public health challenge worldwide. As the screening is carried out mainly by some sort of endoscope, and the endoscopic image processing is an important area of research and development, it is essential to know what kind of measures are used in determining whether polyp finding hit rates or miss rates are acceptable. It is rather natural to match the hit rate measures to the method itself; thus, in this contribution, the most typical polyp detecting methods are summarized shortly together with the metrics they use for evaluation of their results. However, in computer-aided diagnostics, the measure that is used by the medical community might differ from the measures typical in image processing researches. Also, the output of such polyp detecting methods is tested as inputs for active contour methods.

Open Access: Yes

DOI: 10.1007/978-981-33-4676-5_10

Parallels and patterns in the Italian (1901) and Hungarian (1903) legislation on migration

Balázs Pálvölgyi

Publication Name: Comparative Legal History

Publication Date: 2024-01-01

Volume: 12

Issue: 1

Page Range: 51-79

Description:

The second half of the nineteenth century was an era of mass labour migration in Europe, when the Atlantic route became of paramount importance alongside intra-continental mobility. From the last third of the century Italy and Hungary were among the most important emigrating countries. By this time changes in the regulation of migration had begun to take place with the development of stronger state control, which affected mobility and the relationship between emigrants and transporters. The question also arose as to whether and how the large emigrating states could ensure the loyalty of their emigrant citizens and control them en route and in the destination states. The regulatory process which began in the 1880s gradually moved from an administrative approach to the development of more comprehensive legal sources covering more and more aspects of emigration with the Hungarian government making use of foreign solutions, particularly the Italian Emigration Act of 1901.

Open Access: Yes

DOI: 10.1080/2049677X.2024.2349852

Comparing the efficiency of a fuzzy single-stroke character recognizer with various parameter values

A. Tormási Laszlo T. Koczy

Publication Name: Communications in Computer and Information Science

Publication Date: 2012-11-02

Volume: 297 CCIS

Issue: PART 1

Page Range: 260-269

Description:

In this paper the results of a study on the accuracy of a fuzzy logic-based single-stroke character recognizer are presented by refining various parameter values, such as resolution of the fuzzy grid and the minimum distance between sampled points. The symbol set is a modified version of Palm's Graffiti single-stroke alphabet and it contains 26 different symbols. Each symbol is represented by a single fuzzy rule. The rule base was determined by a subset of the collected samples. 99.4% recognition rate has been achieved with the initial rule base, without training. With the revised parameter values the accuracy is close or even slightly beyond the results of other academic or commercial systems. © 2012 Springer-Verlag Berlin Heidelberg.

Open Access: Yes

DOI: 10.1007/978-3-642-31709-5_27

Behaviour of transdanubian clay under unloading and reloading

Edina Koch

Publication Name: Proceedings of the 17th International Conference on Soil Mechanics and Geotechnical Engineering the Academia and Practice of Geotechnical Engineering

Publication Date: 2009-12-01

Volume: 1

Issue: Unknown

Page Range: 463-465

Description:

In recent years, in the field of geotechnical design, software based on FEM has come to the front. Advanced computer programs make it possible to use more developed soil models besides the most current elastic-plastic Mohr-Coulomb model. By using these computer programs, nonlinear behaviour of the soil can be followed better, even in the case of more complicated load events. Among the constitutive models incorporated in the commercial software the Hardening Soil Model (HS) and Soft Soil Model (SS) are the most promising ones. Observations and experience gained in tunnel construction, deep open excavation or preloaded embankment prove that with these soil models reality can be followed more accurately, especially in cases where unloading and reloading are present. In order to produce the software input parameters, in case of more complicated soil model, more demanding laboratory tests are needed. In case of HS model one of the basic demands is to determine the power for stress-level dependency of stiffness (m), tangent stiffness for primary oedometer loading (E oed ref) and unloading/reloading stiffness (E ur ref). The paper focuses on the behaviour of transdanubian clay common in Hungary. Sampling, laboratory investigations and evaluation aimed to determine the input parameters for the HS are described. Results based on a number of oedometric tests accomplished with unloading and reloading proved to be adequate for the computational purposes. © 2009 IOS Press.

Open Access: Yes

DOI: 10.3233/978-1-60750-031-5-463

Effect of protein content on the thermal effusivity of foods

G. Szafner Nóra Gombköto Ottó Dóka

Publication Name: Acta Alimentaria

Publication Date: 2021-12-31

Volume: 50

Issue: 4

Page Range: 475-483

Description:

The availability of thermophysical properties of both foods and their constituents is of considerable importance to the industry. The thermal effusivity is one of the less explored thermophysical parameters. It governs the penetration of heat into materials and is defined as the square root of the product of thermal conductivity of the material, volume-specific heat capacity, and density. This paper describes the application of a relatively new inverse photopyroelectric method (IPPE) to determine thermal effusivity of dehydrated whey protein isolate and egg white powder versus protein content. In both cases the effusivity values decreased linearly with increasing protein content. One percent increase in protein content of whey protein isolate and egg white lead to 6.5 and 7.2 Ws1/2 m-2 K-1 decrease in effusivity values, respectively.

Open Access: Yes

DOI: 10.1556/066.2021.00042

Steplength thresholds for invariance preserving of discretization methods of dynamical systems on a polyhedron

Yunfei Song Tamás Terlaky Zoltán Horváth

Publication Name: Discrete and Continuous Dynamical Systems Series A

Publication Date: 2015-07-01

Volume: 35

Issue: 7

Page Range: 2997-3013

Description:

Steplength thresholds for invariance preserving of three types of discretization methods on a polyhedron are considered. For Taylor approximation type discretization methods we prove that a valid steplength threshold can be obtained by finding the first positive zeros of a finite number of polynomial functions. Further, a simple and efficient algorithm is proposed to numerically compute the steplength threshold. For rational function type discretization methods we derive a valid steplength threshold for invariance preserving, which can be computed by using an analogous algorithm as in the first case. The relationship between the previous two types of discretization methods and the forward Euler method is studied. Finally, we show that, for the forward Euler method, the largest steplength threshold for invariance preserving can be computed by solving a finite number of linear optimization problems.

Open Access: Yes

DOI: 10.3934/dcds.2015.35.2997

Measuring promotional video performance through eye-tracking and cognitive evaluation: A Fermatean fuzzy decision analytics approach

Dragan Pamucar Pınar Aytekin Mustafa Polat Karahan Kara Galip Cihan Yalçın Gülcan Işık Abdullah Ballı Esra Serdar Tekeli Vladimir Simic

Publication Name: Engineering Applications of Artificial Intelligence

Publication Date: 2026-04-15

Volume: 170

Issue: Unknown

Page Range: Unknown

Description:

Neuromarketing techniques are increasingly employed to measure emotional responses through brainwaves, eye movements, and facial expressions. The primary motivation of this study is to develop a decision support system capable of evaluating promotional video performance levels based on both eye-tracking data and cognitive assessments. The core objective is to propose a hybrid method that simultaneously integrates neuromarketing insights and cognitive evaluations. To this end, a Fermatean fuzzy (FF)−Hamacher−simple weight calculation (SIWEC)−method based on the removal effects of criteria (MEREC)−alternative ranking using two-step logarithmic normalization (ARLON) decision analytics model is developed and implemented. The FF−SIWEC method is employed to determine subjective criterion weights based on expert judgments, while the FF−MEREC method is used to compute objective weights by analyzing both eye-tracking and qualitative evaluations from viewers. Additionally, the Fermatean fuzzy Hamacher weighted aggregation operator ensures precise aggregation of audience evaluations. The FF−ARLON method is applied to obtain final rankings of promotional videos. A real-world case study is conducted to test the applicability of the proposed method, involving six automobile brands and 10 audiences. Eye-tracking analyses are conducted while audiences view the promotional videos, followed by expert and audience evaluations of seven qualitative and six eye-tracking criteria. Among qualitative criteria, “level of emotional impact” is found to be the most significant, while “saccadic direction” emerges as the most important eye-tracking criterion. The promotional video for the Mercedes brand demonstrates the highest overall performance. This study contributes to the literature by proposing a reliable and consistent hybrid model for evaluating promotional video performance.

Open Access: Yes

DOI: 10.1016/j.engappai.2026.114114

Carbon conundrums: Geopolitical clashes and market mayhem in the race for sustainability

Gagan Deep Sharma Mansi Gupta Mohammad Razib Hossain Amar Rao Jaya Singh Parihar Mansi Gupta

Publication Name: Journal of Environmental Management

Publication Date: 2024-01-15

Volume: 350

Issue: Unknown

Page Range: Unknown

Description:

This research presents an in-depth investigation into the dynamic correlation between geopolitical conflicts and carbon markets utilizing the Time-Varying Parameter Vector Autoregression (TVP-VAR) technique. The analysis focuses on the interconnectedness between the Geopolitical Risk Index Daily (GPRD) and vital carbon pricing instruments, specifically the Intercontinental Exchange Endex European Union Allowance (ECEFDC), KraneShares California Carbon Allowance Strat ETF (KCCAK), Shanghai Environment and Energy Exchange China Emission Allowances Online Transactions (SAXCEA), and S&P Global Ex-Japan LargeMidCap Carbon Efficient Index (SPGJ). The daily fluctuations were traced from May 2021 to July 2023. The analysis is divided into short- and long-term connectedness, with particular emphasis on the impact of the Russia-Ukraine conflict on the GPRD's spillover on carbon markets. The short-term connectedness (1–5 days) between GPRD and ECEFDC shows variability, fluctuating between 10% and 40%. Conversely, long-term connectedness exhibited a significant increase during the conflict, peaking at approximately 34% by mid-2022. The analysis of the Total Dynamic Connectedness (TCI) between the GPRD and the KCCAK indicates comparable magnitudes, although with minor initial discrepancies. The short-term connectedness of GPRD and KCCAK decreases from its peak of approximately 10% to approximately 1%. Conversely, long-term connectedness varies between approximately 32% and 2% from May 2022 onwards. The long-term connectedness between GPRD and SAXCEA revealed variable patterns, peaking at around 18% at the beginning of the sample period and rapidly reducing to around 1% within two months. The analysis of the connectedness between GPRD and the SPG) identifies intense fluctuations in both TCI and long-term connectedness. After an initial increase and decrease, these patterns rebound and experience another increase. This research provides significant insights into the complex dynamics of geopolitical conflicts and carbon markets, particularly the impact of the Russia-Ukraine conflict on carbon market behavior.

Open Access: Yes

DOI: 10.1016/j.jenvman.2023.119631