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László Szabó,Orsolya Gyenes,Júlia Szabó,Krisztina Kovács,András Kovács,Gabriella Kiskó,Ágnes Belák,Csilla Mohácsi-Farkas,Erzsébet Takács,László Wojnárovits 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.58 No.-
Effluents of wastewater treatment plants represent critical control points for antibiotic resistancemanagement. To meet strict regulations coming into effect in the future advanced technologies need tobe implemented that can remove the factors contributing to the development of resistance in receivingnatural environments. By performing microbiological assays we show that electron beam treatment of acomplex synthetic effluent wastewater matrix is able to eliminate one of these factors, the antimicrobialactivity of the b-lactam antibiotic piperacillin present at environmentally relevant concentration. SinceOH governs the antibacterial inactivation the technology needs to be designed to the stoichiometricpresence of OH.
Identification of V-belt power losses with temperature measurement
László Kátai,István Szabó 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.8
The efficiency of V-belt drives is determined by several factors collectively: the slip occurring during drive transmission, the externalfriction occurring when the belt enters and exits the pulley as well as the hysteresis loss resulting from inner friction. An experimentalapparatus and calculation method was developed in order to determine the increase in temperature emerging from the contact of the beltand the pulley in idling mode. The tested V-belt piece was bent on a pulley performing alternating motion while the temperature of theV-belt was measured. During the testing the temperature generated in the V-belt was measured as a function of changes in three parameters(Pretension, diameter of pulley and bending frequency). On the one hand, the temperature generated in the V-belt can be estimatedwith the assistance of the function determined on the basis of the testing results. On the other hand the so-called damping factor characterizingthe contact with the pulley (The external friction when entering and exiting the groove) and the hysteresis loss (Inner friction) arealso determined. On the basis of the damping factor (x≈400 Ns/m2) of the V-belt involved in the experiments the other losses (Poth) occurringfrom the pulley-V-belt contact and internal friction may be estimated. With the help of the mathematical models defined for thepulley diameter and belt frequency, taking into consideration the minimization of heat generation, optimal parameters can be calculatedthat serve as beneficial references for designing and tuning V-belt drives.
Analysis of low Reynolds number flow around a heated circular cylinder
László Baranyi,Szilárd Szabó,Betti Bolló,Róbert Bordás 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.7
The objective of this study is to investigate the forced convection from and the flow around a heated cylinder. Experimental and computational results are presented for laminar flow around a heated circular cylinder with a diameter of 10 mm. The experiments were carried out using Particle Image Velocimetry (PIV) in a wind tunnel, and numerical simulations using an in-house code and a commercial software package, FLUENT. This paper presents comparisons for vorticity and temperature contours in the wake of the cylinder. Experimental and computational results are compared with those available in the literature for heated and unheated cylinders. An equation is suggested for a temperature-dependent coefficient defining a reference temperature to be used in place of the constant used in other studies. An attempt is also made to correct differences between average cylinder surface temperature and measured interior temperature of the cylinder.
Ádám Révész,László Péter,Péter J. Szabó,Péter Szommer,Imre Bakonyi 한국물리학회 2012 Current Applied Physics Vol.12 No.1
Fully amorphous NieP layer electrodeposited onto a Cu plate was subjected to severe plastic deformation using surface mechanical attrition treatment in a high energy SPEX 8000 shaker mill. Two series of experiments using different milling conditions (series I: 20 6.35-mm balls; series II: 100 1.59-mm balls)were carried out to explore the mechanism of the process and to investigate the structure of the developed coatings. The evolution of the microstructure and mechanical properties of the NieP layer after the deformation process was studied by x-ray diffraction, scanning electronmicroscopy and hardness measurements.We demonstrate that the different mechanical treatments controllably influence the mechanical behavior of the NieP metallic glass coating. When the vial of the mill is loaded with larger balls, deformation-induced Ni3P compound particles form in the amorphous matrix resulting in a hard (HV ¼ 17 GPa) but non-uniform coating. In the case of milling with many small balls, the increase in the surface hardness is considerably lower (7 GPa) as a consequence of reduced impact energy.
Cost–benefit analysis of remote sensing data types for mapping mosquito breeding sites
Zoltán Kenyeres,Norbert Bauer,László Bertalan,Gergely Szabó,András Márkus,Tamás Sáringer‑Kenyeres,Szilard Szabó 대한공간정보학회 2023 Spatial Information Research Vol.31 No.4
Environmentally friendly biological mosquito control by Bacillus thuringiensis var. israelensis formulations needs appropriate breeding maps. The mapping accuracy depends on the quality of the used remote sensing data. Further, the mapping is expected to be cost-effective. Our aim was to study the effect of the quality of various remote sensing data on the applicability of the maps. We depicted larval habitats by manual interpretation in Quantum GIS 3.16.1 software using remote sensing data of SENTINEL, Google Earth, commercial geoTIFF RGB orthophoto, individual unoccupied aerial systems (UAS) RGB, and multispectral mosaics. Based on our results, after classification of the target area by sorting, mixed-use of remote sensing data is required to achieve a highly cost-efficient mapping: RGB aerial photographs with 0.5 m per pixel resolution can be used efficiently in areas dominated by grassland habitats, while forest areas need customised footage taken by UAS or drones during the foliage-free period (15 cm per pixel resolution, multispectral technique). Our cost–benefit analysis showed that the aim-optimised method could reduce investment to 6–8% and the cost of data collection to 20–50% of the highest budget. This result is significant for all participants of biological mosquito control.