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Found 6423 publications

Complex analysis of the dynamic effects of car population along the trajectories

Tamás Péter Ferenc Szauter József Bokor

Publication Name: Proceedings of the ASME Design Engineering Technical Conference

Publication Date: 2015-01-01

Volume: 9

Issue: Unknown

Page Range: Unknown

Description:

The analyses apply new complex model to analyze both road traffic transport processes and spatial nonlinear vehicle dynamic effects. Therefore also the network traffic processes can be analyzed and in a united system the spatial vehicle dynamic processes realized on networks can be attained. Objective the raising the dynamic safety, risk and hazard analysis, reducing the environmental impact of vehicles.

Open Access: Yes

DOI: 10.1115/DETC2015-47075

Jacaranone Derivatives with Antiproliferative Activity from Crepis pulchra and Relevance of This Group of Plant Metabolites

G. Pinke Norbert Kúsz Ágnes Kulmány Csilla Zsuzsanna Dávid István Zupkó Andrea Vasas Judit Hohmann

Publication Name: Plants

Publication Date: 2022-03-01

Volume: 11

Issue: 6

Page Range: Unknown

Description:

Jacaranones are a small group of specific plant metabolites with promising biological activi-ties. The occurrence of jacaranones is limited to only a few plant families, with Asteraceae being the most abundant source of these compounds. Therefore, jacaranones can also serve as chemotaxonomic markers. Our phytochemical investigation of Crepis pulchra L. (Asteraceae) resulted in three jacara-none derivatives (jacaranone, 2,3-dihydro-2-hydroxyjacaranone, 2,3-dihydro-2-methoxyjacaranone), and (6R,9S)-3-oxo-α-ionol-β-D-glucopyranoside, fulgidic acid, 12,15-octadecadienoic acid methyl es-ter, scopoletin and apigenin-7-O-β-D-glucoside. This is the first report on the isolation of jacaranones from a species belonging to the Cichorioideae subfamily of Asteraceae. Jacaranone derivatives were subjected to an in vitro antiproliferative assay against a panel of human cancer cell lines (MCF-7, MDA-MB-231, HeLa, and C33A), revealing high or moderate activities, with IC50 values ranging from 6.3 to 26.5 µM.

Open Access: Yes

DOI: 10.3390/plants11060782

Quantitative comparison of some faecal bacterial communities in groups of Mangalica and commercial pigs

Károly Tempfli László Pongrácz Klaudia Szalai Sárvári Loretta Csilla Emil Balázs Herceg Agnes Bali Papp

Publication Name: Bio Web of Conferences

Publication Date: 2024-08-23

Volume: 125

Issue: Unknown

Page Range: Unknown

Description:

Different housing technology, breed, age and nutrition can contribute to changes in the composition of microbial communities in pigs. Faecal samples from groups of Mangalica and commercial pigs were collected and analysed by qPCR in order to identify changes and differences regarding the quantity of total faecal bacteria, Prevotella genus, Lactobacillus spp., Bifidobacterium spp., Enterococcus spp. and the family Enterobacteriaceae. In both Mangalica and commercial pig samples, quantities of total faecal bacteria increased from weaner pigs to lactating sows. The relative quantity of total bacteria was larger (p<0.05) in Mangalica growers and lactating sows compared to commercial pigs. The ratio of Prevotella genus in total bacteria was higher (p<0.05) in Mangalica growers and lower in Mangalica lactating sows compared to respective commercial groups. The ratio of Lactobacillus spp. was largest (p<0.05) in samples of Mangalica boars, whereas ratios of Bifidobacterium spp. were greater (p<0.05) in Mangalica weaners, growers, and boars. Faecal samples of Mangalica growers contained a higher ratio of Enterobacteriaceae in total bacteria, whereas Enterococcus spp. was more prevalent in commercial weaner pigs and boars (p<0.05). Considerable changes in faecal bacteria communities were observed in association with different age and utilization.

Open Access: Yes

DOI: 10.1051/bioconf/202412503005

Vertical random vibration test spectrum to simulate forklift handling environment

Laszlo Horvath Péter Böröcz Yu Yang Huang

Publication Name: Journal of Testing and Evaluation

Publication Date: 2022-03-01

Volume: 50

Issue: 2

Page Range: Unknown

Description:

Analyzing and measuring the vibration environment during distribution is fundamental to understanding and simulating the ability of a packaged-product system to avoid any damages from transportation hazards. During distribution, various vehicles, including forklifts, are used to perform shipping and handling tasks such as loading, unloading, and warehouse organizing processes. The aim of this paper was to provide an understanding of the average vibration levels that occur during handling so they can be used in pre-shipment testing. Various forklifts were observed, measured, and analyzed to obtain information about their average vibration levels while performing recommended tests. The measured acceleration-time data were analyzed in terms of power spectral densities (PSD) and presented with statistical data that provided an understanding of the variability of intensity. The PSD peaks were between approximately 2.5 and 5 Hz, and then they decreased to 120 Hz. The number of instances over 120 Hz was extremely low. The final recommended vibration test spectrum was determined to be in the frequency range of 1–120 Hz and the data were smoothed between six breakpoints.

Open Access: Yes

DOI: 10.1520/JTE20210293

Physical activity and screen time among hungarian high school students during the COVID-19 pandemic caused distance education period

Ferenc Ihász Robert Podstawski Johanna Takács Imre Soós Tamás Gyömörei Zsolt Bálint Katona László Kerner Zoltán Alföldi

Publication Name: International Journal of Environmental Research and Public Health

Publication Date: 2021-12-01

Volume: 18

Issue: 24

Page Range: Unknown

Description:

Background: High school education took place in the form of distance learning during SARS-CoV-2 pandemic worldwide, including Hungary. Decreased physical activity and an increase in inactive behaviours may lead to an increased risk of obesity, diabetes, and cardiovascular disease. Aim: Our study targeted changes in physical activity (aerobic exercise, muscle strengthening) and screen time in adolescents and young adults during the pandemic. Methods: High school students were interviewed in 66 public schools in 37 Hungarian cities (N = 2508). Survey items on physical activity and screen time were derived from the WHO Health Behaviour of School-aged Children Survey and the Centers for Disease Control Youth Risk Behavior Survey. A 2 × 2 factorial ANCOVA was used to test the effects of gender (male vs. female) and/or age (adolescents vs. young adults) on the reported changes in physical activity and screen time before and during lockdown (covariate: BMI Z-score). Results: The majority of the cohort indicated less physical activity. Aerobic and muscle-strengthening type of exercises significantly decreased, and screen time increased during distance education. Male individuals showed a higher decrease in the level of aerobic exercise, and young adults reported a higher increase in the time spent in front of the screen.

Open Access: Yes

DOI: 10.3390/ijerph182413024

Minimal Non-C-Perfect Hypergraphs with Circular Symmetry

Pál Pusztai Zsolt Tuza Péter Bence Czaun Levente Sebők

Publication Name: Symmetry

Publication Date: 2023-05-01

Volume: 15

Issue: 5

Page Range: Unknown

Description:

In this research paper, we study 3-uniform hypergraphs (Formula presented.) with circular symmetry. Two parameters are considered: the largest size (Formula presented.) of a set (Formula presented.) not containing any edge (Formula presented.), and the maximum number (Formula presented.) of colors in a vertex coloring of (Formula presented.) such that each (Formula presented.) contains two vertices of the same color. The problem considered here is to characterize those (Formula presented.) in which the equality (Formula presented.) holds for every induced subhypergraph (Formula presented.) of (Formula presented.). A well-known objection against (Formula presented.) is where (Formula presented.), termed “monostar”. Steps toward a solution to this approach is to investigate the properties of monostar-free structures. All such (Formula presented.) are completely identified up to 16 vertices, with the aid of a computer. Most of them can be shown to satisfy (Formula presented.), and the few exceptions contain one or both of two specific induced subhypergraphs (Formula presented.), (Formula presented.) on five and six vertices, respectively, both with (Formula presented.) and (Formula presented.). Furthermore, a general conjecture is raised for hypergraphs of prime orders.

Open Access: Yes

DOI: 10.3390/sym15051114

The use of biostimulant microalgae to influence the growth and development of ornamental plants

Zoltán Molnár S. Katona N. Horváth Gábor Kerekes Attila G.L. Németh

Publication Name: Bio Web of Conferences

Publication Date: 2024-08-23

Volume: 125

Issue: Unknown

Page Range: Unknown

Description:

The article discusses the use of biostimulant microalgae, known for their bioactive compounds. Understanding the positive impacts of biostimulants is essential for future applications. Research conducted in the Department of Plant Sciences at the Széchenyi István University has revealed that algae produce plant hormones and possess beneficial properties that influence the water, soil and plant systems. The effects of microalgae on various ornamental plants are being studied with a focus on improving root and general plant development. The methodology involves testing different algae extracts in ornamental plants in controlled environments. Data collection includes measuring plant height, leaf and bud numbers, chlorophyll content and other plant parameters through laboratory and destructive tests. The results indicate positive changes in plant parameters after treatments with biostimulant microalgae. In conclusion, biostimulant microalgae offer a promising and eco-friendly alternative to synthetic chemicals in the cultivation of ornamental plants. Continued research and innovation in this field is crucial to realise the full potential of biostimulants in sustainable agriculture.

Open Access: Yes

DOI: 10.1051/bioconf/202412503003

Building Diagnostics Options for Existing Buildings – Innovative Methods

Adam Bukovics Kitti Karolyfi Dóra Szalai Zsolt Szűrös Rita Rebeka Ördög

Publication Name: Chemical Engineering Transactions

Publication Date: 2024-01-01

Volume: 114

Issue: Unknown

Page Range: 793-798

Description:

The increasing number of buildings, due to erosion and extraordinary effects, has increasingly made technological advancements focused on innovative methods possible. This has become more prominent alongside traditional practices such as visual inspection and destructive building diagnostic methods. Thanks to the continuous development of tools, technologies and methodologies, the accurate and detailed digital mapping of buildings (including all their aspects) is available. Among these solutions, the laser scanner point cloud is the most popular due to its high level of detail. The newly emerging and now widespread survey procedures based on laser, photogrammetric remote sensing reflect a real-time, current state of the buildings, which maximizes the accuracy of the Building Information Model (BIM) - Historic Building Information Model (HBIM) completed in the later phases and helps detect structural or surface defects. This study presents the analyzing techniques of point clouds to diagnose buildings, assess their condition, identify errors, and develop sustainability strategies. It also explores areas that require further research and development to enhance the effectiveness of these methods. In the first phase of the paper, the currently used point cloud generation technologies (e.g.: laser scanning, photogrammetry, light detection and ranging (LiDAR)) will be presented with their advantages and disadvantages. The research methodology was conducted using the VOSviewer software to visually analyze bibliometric networks from a dataset of scientific publications, focusing on trends in structural health monitoring and highlighting key areas such as damage detection, computer vision, and AI-based techniques. In the second phase of the study, the possibilities of the analysis of point clouds and image processing-based survey options for structural diagnostic purposes will be explained and presented. The evaluation of the three damage detection methodologies (Geometrical features, Color and intensity information, Combined Method) highlights their complexity, technological requirements, cost, practical applicability, and accuracy. During the analysis, the goal is to map and systematize innovative methods supported by digital tools for diagnostic tasks in existing buildings.

Open Access: Yes

DOI: 10.3303/CET24114133

Polymer and Fiber Modification of Asphalt Mixtures

Richárd Nagy Mohammad Fahad

Publication Name: Lecture Notes in Networks and Systems

Publication Date: 2026-01-01

Volume: 1768 LNNS

Issue: Unknown

Page Range: 1-15

Description:

The incorporation of various fibers into SBS-modified asphalt mixtures can markedly enhance their performance, offering a more economical approach than simply increasing the SBS content. This research investigated the effects of adding Basalt, Polyester, and Lignin fibers to a bitumen binder modified with 3% SBS and compared the results to a 7% SBS mixture without fibers. Laboratory evaluations, including indirect tensile strength and Dynamic Shear Rheometer (DSR) testing, were carried out to assess the mechanical properties of the mixtures. Additionally, finite element simulations based on the Burgers-Logit model were performed, along with microstrain analyses, to examine rutting and fatigue behavior, providing further context to the experimental findings. Results indicated that fiber-reinforced mixtures exhibited superior performance, with noticeable improvements in tensile strength and complex shear modulus. Among the fibers tested, Basalt fiber delivered the highest overall performance, surpassing the other types. Notably, the mixture containing Basalt fiber showed a 25% increase in rutting resistance and a 28% enhancement in fatigue damage resistance relative to the 7% SBS mixture.

Open Access: Yes

DOI: 10.1007/978-3-032-13898-9_1