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Publications - 6374

Using natural deep eutectic solvents for the extraction of antioxidant compounds from cornelian cherry (Cornus mas L.) fruits

E. Lakatos Székelyhidi Rita Beatrix Sik Zsolt Ajtony

Publication Name: Green Analytical Chemistry

Publication Date: 2024-12-01

Volume: 11

Issue: Unknown

Page Range: Unknown

Description:

Traditionally used extraction methods are usually based on toxic and/or flammable solvents. Therefore, currently, increased attention has been focused on environmentally friendly green extraction techniques. We aimed to develop a green extraction procedure by using natural deep eutectic solvents (NADES) to recover antioxidant compounds from cornelian cherry fruits (Cornus mas L.). Natural deep eutectic systems combined with maceration with shaking extraction were tested to recover of antioxidant compounds from cornelian cherry fruits. In this study, four different independent variables, namely solvent type (Glu-CA; Glu-Gly; LA-Glu), water concentration (30, 50, and 70 %; v/v), extraction time (30, 60, 90, and 120 min), and extraction temperature (25, 40, and 50 °C) were investigated. Glucose-glycerin (Glu-Gly; 1:1 M ratio) based solvent provided the best results. In addition, one-factor-at-a-time (OFAT) optimization showed that a temperature of 25 °C, 120 min of extraction time, and water concentration of 50 % (v/v) to be the best extraction parameters for Glu-Gly based NADES extraction. The developed method has been successfully applied for the extraction of antioxidant compounds from 13 different cornelian cherry cultivars. NADES can be used safely to extract phenolic compounds from cornelian cherry fruits compared to conventional extraction solvents (water and 80 % (v/v) ethanol).

Open Access: Yes

DOI: 10.1016/j.greeac.2024.100154

Methods for improving the mid-frequency acoustic simulation of a lightly damped plate

Dániel Feszty Marcell Treszkai Tamas Turcsik Janos Kun

Publication Name: Proceedings of 2020 International Congress on Noise Control Engineering Inter Noise 2020

Publication Date: 2020-08-23

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

The constantly evolving customer demands in the automotive industry necessitates vehicle manufacturers to perform ever more accurate acoustic simulations. Acoustic simulations especially in the mid-frequency range (400 Hz - 1000 Hz) pose particular challenges: statistical methods lack the necessary modal density for accuracy, while Finite Element Methods (FEM) have difficulty accounting for statistical effects. In order to resolve the conflict that FEM solvers face, an academic case is investigated. A flat plate of 650x 750 mm in free-free condition is examined as a low-complexity platform to investigate the sensitivity of FEM simulation results to parameters, such as the value of structural damping, the frequency dependency of structural damping as well as the variations in the plate thickness due to manufacturing tolerances. FEM simulations were performed using ESI VPS and compared to measurements. Results show that slight variations in plate thickness and Young`s modulus can have significant impact on the frequency response. Results have shown that a 0.5% variation in the thickness already has a pronounced effect on frequency response peak locations, especially between 600 and 1000 Hz. Beside this, the paper provides novel results on evaluating the effects of frequency dependency of structural damping on the results.

Open Access: Yes

DOI: DOI not available

MILD HOME and EcoGreen village: An ecological and economical concept for sustainability

T. Horváth

Publication Name: Procedia Engineering

Publication Date: 2014-01-01

Volume: 85

Issue: Unknown

Page Range: 240-250

Description:

"MILD HOME and EcoGreen Village" is the title of a transnational project in South East Europe and a name of a concept, which aims to find a realistic middle way in the usage of sustainable architectural and technical tools for the residential buildings and areas. Eight architectural competitions were held to find the suitable solutions for different sites in different countries. This paper presents the most interesting entries. The awarded designs offer a great variety of solutions for the sites from the society model to the applied materials. Discussions in this topic can help us in the creation of our sustainable future.

Open Access: Yes

DOI: 10.1016/j.proeng.2014.10.549

A numerical C1-shadowing result for retarded functional differential equations

Gyula Farkas

Publication Name: Journal of Computational and Applied Mathematics

Publication Date: 2002-08-15

Volume: 145

Issue: 2

Page Range: 269-289

Description:

The aim of the present paper is to give a numerical C1-shadowing between the exact solutions of a functional differential equation and its numerical approximations. The shadowing result is obtained by comparing exact solutions with numerical approximation which do not share the same initial value. Behavior of stable manifolds of functional differential equations under numerics will follow from the shadowing result. © 2001 Elsevier Science B.V. All rights reserved.

Open Access: Yes

DOI: 10.1016/S0377-0427(01)00581-7

Classification of time series using singular values and wavelet subband analysis with ANN and SVM classifiers

Balázs Benyó Péter Somogyi Péter Várady Béla Paláncz

Publication Name: Ines 05 IEEE 9th International Conference on Intelligent Engineering Systems Proceedings

Publication Date: 2005-01-01

Volume: 2005

Issue: Unknown

Page Range: 239-243

Description:

Oscillation of the cerebral blood flow (CBF) is a common feature in several physiological or pathophysiological states of the brain. It is promising to identify the disorders of the cerebral circulation based on the classification of CBF signals. In order to distinguish between different physiological states, two different classification methods have been developed; a Radial Basis Function based Neural Network and a Support Vector Classifier with Gaussian kernel. In order to describe the temporal blood flow patterns, two feature extraction procedures were applied; spectral matrix and wavelet subband analysis. These feature extraction and classification methods are evaluated and their efficiencies are compared. The computations were carried out with Mathematica 5.1 and its Wavelet Application. © 2005 IEEE.

Open Access: Yes

DOI: 10.1109/INES.2005.1555165

Classification of preeclampsia according to molecular clusters with the goal of achieving personalized prevention

Offer Erez Adi L. Tarca Nándor Gábor Than Dániel Györffy Zoltán Papp Simona W. Rossi Sándor Nagy Roberto Romero Máté Posta Nándor Ács Gábor Szalai András Szilágyi Olga Török Petronella Hupuczi

Publication Name: Journal of Reproductive Immunology

Publication Date: 2024-02-01

Volume: 161

Issue: Unknown

Page Range: Unknown

Description:

The prevention of pre-eclampsia is difficult due to the syndromic nature and multiple underlying mechanisms of this severe complication of pregnancy. The current clinical distinction between early- and late-onset disease, although clinically useful, does not reflect the true nature and complexity of the pathologic processes leading to pre-eclampsia. The current gaps in knowledge on the heterogeneous molecular pathways of this syndrome and the lack of adequate, specific diagnostic methods are major obstacles to early screening and tailored preventive strategies. The development of novel diagnostic tools for detecting the activation of the identified disease pathways would enable early, accurate screening and personalized preventive therapies. We implemented a holistic approach that includes the utilization of different proteomic profiling methods of maternal plasma samples collected from various ethnic populations and the application of systems biology analysis to plasma proteomic, maternal demographic, clinical characteristic, and placental histopathologic data. This approach enabled the identification of four molecular subclasses of pre-eclampsia in which distinct and shared disease mechanisms are activated. The current review summarizes the results and conclusions from these studies and the research and clinical implications of our findings.

Open Access: Yes

DOI: 10.1016/j.jri.2023.104172

A possible extension of the Aboav-Wealre law

Ibolya Zsoldos Tamás Réti

Publication Name: Materials Science Forum

Publication Date: 2005-01-01

Volume: 473-474

Issue: Unknown

Page Range: 389-398

Description:

The semi-empirical Aboav-Weaire law is generally used to characterize the local topological correlation between the neighbor cells in 2D space-filling random cellular system. Starting with a possible generalization of the Aboav-Weaire law, this paper presents a new method, which is designated primarily to the topological characterization of finite cellular systems defined on an unbounded, closed and orientable surface, and composed of a finite set of combinatorial polygons. It is demonstrated that using two simple topological parameters (AR and ER) derived from the extended Aboav-Weaire equation, the local structure and the stability of polyhedral fullerenes can be efficiently evaluated on the basis of quantitative criteria. © 2005 Trans Tech Publications, Switzerland.

Open Access: Yes

DOI: 10.4028/0-87849-957-1.389

Mycoplasma hyopharyngis isolated from the joint of a weaner: A case report

Miklós Gyuranecz Zsuzsa Kreizinger Dorottya Földi Eszter Zsófia Nagy Gergely Tóth László Gombos László Makrai

Publication Name: Acta Veterinaria Hungarica

Publication Date: 2024-09-12

Volume: 72

Issue: 3

Page Range: 155-160

Description:

Background: Mycoplasma hyopharyngis is a commensal bacterium in the upper respiratory tract of swine. As it is recognized to be apathogenic, examinations regarding this species are scarce, compared to other swine mycoplasmas. However, in a few cases, M. hyopharyngis was detected in lesions of different organs. This report presents a case study in which M. hyopharyngis (along with other bacteria) was isolated from the joint of a pig showing lameness. Case presentation: A Hungarian farm was repopulated with 250 gilts and 1,700 finishers after undergoing a complete depopulation and disinfection. Two days later, cases of diarrhoea and septicaemia caused by Salmonella enterica serovar typhimurium were seen in the finishers. At the same time, following the first farrowing, swollen joints were observed in 21-25 days old piglets. Joint samples were collected, and isolation of Mycoplasma sp. and other bacteria was attempted. Analysis of the joint samples revealed the presence of Staphylococcus haemolyticus, Staphylococcus hyicus, Aerococcus viridans, Trueperella pyogenes, Streptococcus agalactiae and M. hyopharyngis. Conclusions: This is the second isolation of M. hyopharyngis from joints, which highlights the necessity of a better understanding the biology of this often-overlooked species, and its role in the progress of arthritis or other lesions.

Open Access: Yes

DOI: 10.1556/004.2024.01078

Testing output variables for sensitivity study of nonlinear vibration systems

F. Hajdu G. Y. Molnarka

Publication Name: Pollack Periodica

Publication Date: 2020-08-01

Volume: 15

Issue: 2

Page Range: 70-81

Description:

In this study the detailed One-at-a-Time sensitivity analysis of nonlinear massspring- damper systems is carried out with numerical simulation. The degree of sensitivity was measured with a sensitivity index and based on its sensitivity Fuzzy-sets were established. The sensitivity of a parameter then can be expressed by the membership to the Fuzzy-sets. In this study the root mean square of acceleration, the maximum amplitude of acceleration and the peak frequency were chosen as output variables to measure sensitivity. With this research it was proven, that the root mean square of acceleration and the peak frequency can be used for sensitivity study of nonlinear vibration systems effectively.

Open Access: Yes

DOI: 10.1556/606.2020.15.2.7