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Publications - 6374

Recent aspects of pharmaceutical and endoscopic treatment of acute gastroduodenal ulcer bleeding

Istvan Racz

Publication Name: Orvosi Hetilap

Publication Date: 2023-06-11

Volume: 164

Issue: 23

Page Range: 883-890

Description:

Acute gastroduodenal ulcer bleeding is a life-Threatening condition. Management of the acute gastroduodenal ulcer bleeding requires the cooperation of different specialists. The complex management program includes the immediate control of the hemodynamic status, transfusion and gastric acid inhibition therapy, endoscopic diagnosis, treatment and occasionally the invasive radiological interventions and surgery. According to the recent guidelines, pre-endoscopic parenteral proton-pump inhibitor therapy is recommended only for consideration. Urgent endoscopy (≥12 hours after admission) has no advantage to the early endoscopic (≥24 hours after admission) strategy. For ulcers with high rebleeding risk due to more than 2 cm in diameter, fibrotic base or wide visible vessel, the use of the "over-The-scope clip"is advisable even as a first-line endoscopic hemostatic therapy. Intermittent high-dose parenteral proton-pump inhibitor therapy is a new therapeutical option after endoscopic hemostasis. In patients with acute gastroduodenal bleeding who are taking low dose aspirin for secondary cardiovascular prophylaxis, aspirin should not be interrupted, while low dose aspirin administered for primary prophylaxis may be stopped.

Open Access: Yes

DOI: 10.1556/650.2023.32808

The polarization method combined with the Newton-Raphson technique in magnetostatic field problems

Miklós Kuczmann

Publication Name: Przeglad Elektrotechniczny

Publication Date: 2008-12-01

Volume: 84

Issue: 12

Page Range: 198-201

Description:

Nonlinear magnetic field problems can be solved by using the polarization method. After applying the Finite Element Method (FEM), a system of nonlinear equations can be derived, which can only be solved by iterative techniques. The fixed point iteration scheme and the Newton-Raphson technique are the most widely used algorithms to solve nonlinear equations. The first is known as a convergent, but slow algorithm, while the other is a fast solver, which convergence can be critical. This paper presents and compares the two methods.

Open Access: Yes

DOI: DOI not available

Understanding how sources of communication can shape digital purchase intention

Charles Perez Jessica Lichy Vincent Dutot

Publication Name: Electronic Commerce Research

Publication Date: 2026-01-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

Drawing on self-expansion theory, social identity theory, and social influence theory, this study examines how two sources of brand communication - offline friend communities and online communities—shape online purchase intention through self-expansion and brand identification. It also addresses a core limitation of dominant technology acceptance models, which treat social influence as monolithic and fail to capture source-level psychological effects. A quantitative survey of millennials (n = 224) is analyzed using partial least squares structural equation modelling and multi-group analysis. Results show that offline friend community belonging activates self-expansion, while online community belonging drives brand identification—two distinct pathways to purchase. A significant gender split emerges: both mechanisms predict purchase intention for males but not for females. Managerial implications include gender-specific budget allocation guidance between offline referral and online community strategies, and differentiated messaging to activate self-expansion and brand identification respectively.

Open Access: Yes

DOI: 10.1007/s10660-026-10128-1

Thermodynamic Processes in Nanostructured Thermocoatings

David Bozsaky

Publication Name: Current Topics and Trends on Durability of Building Materials and Components Proceedings of the 15th International Conference on Durability of Building Materials and Components Dbmc 2020

Publication Date: 2020-01-01

Volume: Unknown

Issue: Unknown

Page Range: 1127-1134

Description:

In the 21st century, global climate change and the high level of fossil energy consumption have introduced changes affecting all sectors of the economy, including the building industry. This process has prompted EU members to create strict regulations in building energetics. It has become a serious task for architects to find more effective ways for thermal insulation. One of these options is the application of nanostructured materials. Among them nano-ceramic thermocoatings open a wide range of research fields, because complete agreement had not been already found about their insulating effect. In order to explore and describe the thermodynamic process inside nano-ceramic thermocoatings 6 series of heat transfer resistance experiments were performed in 2014-2018. Several building structure configurations with 12 different orders of layers were tested with a standard heat flow meter. On basis of these results it could be concluded that in case of nano-structured thermocoatings convective heat transfer coefficient might be taken account in different way than in case of traditional macro-structured thermal insulation materials. Based on research results, the limits of its applicability can also be concluded. It has also been found that the insulating effect of nanostructured thermocoatings depends on the material characteristics of the insulated surface.

Open Access: Yes

DOI: 10.23967/dbmc.2020.139

The Personal Assistant application, problem definition

Claudiu Radu Pozna Peter Foldesi János Kovacs

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

Publication Date: 2013-01-01

Volume: Unknown

Issue: Unknown

Page Range: 851-856

Description:

The subject of the paper is a personal assistant design. The goal of personal assistant is a daily activities list planning. The personal assistant will assist the costumer (human operator) for planning an optimum succession of desired activities. The solution is based on objective and subjective information. The paper focus on problem definition, mathematical structure of the concepts which are involved and a first solution analyze. © 2013 IEEE.

Open Access: Yes

DOI: 10.1109/CogInfoCom.2013.6719215

Several meshless solution techniques for the stokes flow equations

Csaba Gáspár

Publication Name: Computational Methods in Applied Sciences

Publication Date: 2009-01-01

Volume: 11

Issue: Unknown

Page Range: 141-158

Description:

The permanent 2D Stokes flow is considered. The applied solution technique is the classical pressure correction method, which converts the original problem to a sequence of Poisson equations. These Poisson equations are discretized and solved in a meshless way, using local interpolation based on radial basis functions. Further improvement can be achieved by using a direct multi-elliptic approach instead of local interpolation, which results in re-globalized, quadtree-based schemes. The number of unknowns can be reduced by applying the method of fundamental solutions. A special regularization technique is introduced which uses higher order fundamental solutions without singularities. This regularization is combined with the direct multi-elliptic interpolation, which significantly reduces the computational cost and makes it possible to avoid the use of dense and ill-conditioned matrices.

Open Access: Yes

DOI: 10.1007/978-1-4020-8821-6_9

Comprehensive Laboratory Test Series for Timber-Concrete Composite Structures

Majid Movahedi Rad Dániel Harrach

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2023-01-01

Volume: 20

Issue: 1

Page Range: 231-250

Description:

Timber-concrete composite structures are not as widespread as traditional steel-concrete fabrications; this structural design still has many critical points that require tests on laboratory specimens. This paper presents the complex testing process of timber-concrete composite structures, which must be followed from the investigation of the possibilities of connecting timber and concrete to each other, through the tests of bended beams acting as timber-concrete composites, to the laboratory tests of full-scale custom-designed timber-concrete composite bridge structures subjected to both concentrated and distributed loads. In this study, to improve the flexural properties of timber beams, carbon fiber-reinforced polymer (CFRP) laminates are attached externally to timber elements. To verify the behavior of the designed structure, we built a full-scale experimental structure and performed a load test. In the laboratory tests, the serviceability limit states, standard loads and load arrangements were investigated. The results of the loading experiments were evaluated. The bridge structures in this article will be placed outdoors after completion of the tests, where they will be used as pedestrian-bicycle bridges. In the case of the examined structures, it was an important aspect, to use elements that are commercially available and suitable for use in the Hungarian design and regulatory systems.

Open Access: Yes

DOI: 10.12700/APH.20.1.2023.20.16

Friction and Wear of the Piston Ring - Cylinder Liner System with Artificially Aged Ultra-low Viscosity Engine Oils

András Lajos Nagy

Publication Name: Periodica Polytechnica Transportation Engineering

Publication Date: 2024-01-01

Volume: 52

Issue: 2

Page Range: 190-198

Description:

This study aims to investigate the performance of artificially aged prototype engine oils through friction and wear experiments. Experiments were performed on a piston ring - cylinder liner model system with boundary conditions derived from real-life operating conditions. The experimental design implemented two prototype oils (SAE 0W-12 and 0W-16) in unaltered and artificially aged form. An additional fully formulated off-the-shelf engine oil (SAE 0W-20) was also aged and analyzed as reference. Oil samples were artificially aged in a custom rig, to simulate long-term in-engine use through thermal cycling at 180 °C. Fourier Transformed Infrared Spectroscopy of the lubricant samples highlighted a depletion of zinc dialkyl-ditiophosphate antiwear additives in all cases, which is comparable to a selected in-service oil. Oxidation was also measurable, albeit lower compared to the in-service sample. Averaged friction coefficients showed a ranking of aged 0W-12 < aged 0W-16 < unaltered 0W-12 < unaltered 0W-16. A decrease in surface roughness was experienced with aged oil samples, whereas unaltered 0W-16 oil produced an unexpected transition in the wear phenomenon and resulted in severe wear.

Open Access: Yes

DOI: 10.3311/PPtr.22918

The effect of the perceived value of cultural services on the quality of life

Ida Ercsey László Józsa

Publication Name: International Review on Public and Nonprofit Marketing

Publication Date: 2016-04-01

Volume: 13

Issue: 1

Page Range: 15-36

Description:

In international and especially in Hungarian marketing literature, a few pieces of research deal with analysis of the relationship between the subjective quality of life and the services. The objective of this article is to explore, what the role of the perceived value of cultural activities play in the evaluation of the young people’ quality of life. First, we look over the quality of life studies in the cultural industry. Next, we study the perceived value comparing two main approaches to the conceptualisation of this framework. Based on the scales of previous studies and our results of the exploratory phase (small-group interviews, and pilot study) we developed the initial scales for measurement of the subjective quality of life (QOL) and the perceived value of cultural activities. We conducted a survey to test our hypotheses. The target population of our research is consumers who participated in cultural activities between 14 and 30 ages in one Hungarian region. Our results show that perceived value of cultural services has three different dimensions: functional (quality and price of cultural service, installation of cultural provider, and personnel expertise), emotional and social ones. We found that the functional dimension of cultural services has positive effect on the consumers’ global QOL. Besides, the emotional and social values of cultural services contribute to the higher perception of the family and friend relationships among young users. Finally, we discuss our results, managerial implications, and formulate limitations of our empirical research and further research.

Open Access: Yes

DOI: 10.1007/s12208-015-0140-9