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1

Investigation on the Effect of Granulometric Features on the Permeability of No-Bake Resin Bonded Sand Cores

Hudák H., Gyarmati G., Varga L.

Archives of Foundry Engineering

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2021

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Vol. 21, iss. 2

99--105

EN

Foundry sand is the main element of sand mixtures from which molds or sand cores are made. Due to the continuous development of core making technologies, the selection of the right type of base sand becomes more and more important. The major features of foundry sand are determined by the following factors: chemical and mineralogical composition, sand grain size, grain size distribution, sand grain shape, and surface quality. The main goal of our research was to develop a qualification method that can be used to predict the characteristics of sand cores made from different sand types. Samples made from different types of foundry sand were used during the research whose properties were examined with a new qualification system, and then its connection with the gas permeability of sand cores was analyzed. Based on the research results, a strong correlation could be established between the suggested quality indicators: CQi (Core Quality Index), CG (Coefficient of Granulometry), and permeability.

2

Effects of winter wheat supplementation with selenium

Ducsay L., Ložek O., Varga L., Lošak T.

Chemia i Inżynieria Ekologiczna

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2007

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Vol. 14, nr 3-4

289-294

EN

Effect of foliar application of graduated Se rates (0; 0.5; 1.0; 10 and 20 g Se o ha-1) on Se accumulation in grain winter wheat and Se uptake by grain was investigated in the accurate field fertilization experiment. Selenium fertilization was applied as solution Na2SeO3 o 5H2O in the growth stage of the 6th leaf (Zadoks = 29). Applied treatments of Se fertilization did not influence the yields of gram. Both the rates of 10 and 20 g Se per hectare highly significantly increased Se accumulation in grain in all experimental years. Average Se content in grain dry matter was 0.039 š 0.015 mg o kg-1 under unfertilized treatment and with the Se rates of 10 g and 20 go ha-1 it increased to the values of 0.094 š 0.015 and 0.192 š 0.088 mg o kg-1, respectively. The total uptake of Se by grain yield increased in the similar way. Se translocation to the wheat gram represented 10.0, 2.9 and 4.4% of total applied Se, respectively, when the rates of 1, 10 and 20 g Se - ha-1 were applied. It results from the experiment that the rate of 10 g Se - ha -1 is sufficient for achieving the required Se content in winter wheat grain. Se application impoved the nutritive value of winter wheat grain.

PL

W ścisłym doświadczeniu polowym badano wpływ dolistnego nawożenia wzrastającymi dawkami selenu (0; 0,5; 1,0; 10 i 20 g Se o ha-1) na akumulację w ziarnie pszenicy ozimej. Nawożenia selenem w postaci roztworu Na2SeO3 o 5H2O stosowano w stadium rozwoju 6 liścia (Zadoks = 29). Zastosowane nawożenie Se nie miało wpływu na ilość plonu ziarna. Dawki 10 i 20 g Se o ha-1 w znacznym stopniu zwiększały jego akumulację w ziarnie we wszystkich latach doświadczeń. Średnia zawartość selenu w suchej masie ziarna pszenicy nienawożonej wynosiła 0,039:k 0,015 mg o kg-1, a w nawożonych dawkami 10 i 20 g Se - ha--1 zwiększała się odpowiednio do 0,094 š 0,015 i 0,192 š 0,088 mg Se o kg-1 s.m. Całkowite pobranie Se z plonem ziarna zwiększało się w podobnym stopniu. Z doświadczeń wynika, że dawka 10 g Se o ha -1 jest wystarczająca do osiągnięcia wymaganej zawartości selenu w ziarnie pszenicy ozimej. Stosowanie selenu poprawiło wartość odżywczą ziarna pszenicy ozimej.

3

Solution Methods of Overhead Transmission Line Mechanics

Varga L., Ilenin S., Chladný V.

Electrical Power Quality and Utilisation. Journal

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2006

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Vol. 12, nr 1

17-20

EN

Paper is focused to mechanics calculation of overhead transmission lines. In first part of this paper is presented mathematical model for complex solution of overhead line mechanics in a plan. Non-level overhead line can be considered. The second part of paper deals with a solution method of the mechanics of overhead line conductors in three-dimensional space in non- level span. This method enables to define three-dimensional location, vector of mechanics stress of suspended line in optional point of line under combined load caused by the ice and the wind of optional direction.

4

Compensation of overhead transmission lines by shunt reactors

Ilenin S., Lescinsky P., Varga L.

Zeszyty Naukowe. Elektryka / Politechnika Opolska

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2005

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Vol. 299, z. 55

105-112

EN

This paper deals with problems of reactors utilization on overhead transmission lines in order to balance reactive power. This compensation is necessary in case when power transmission is lower then natural capacity or there are no load condition. Rated power of reactors depends on natural capacity and length of the line.