Study of the Impact of Synthetic Fluid on the Lifetime of Hydraulic Pump

2013 ◽  
Vol 801 ◽  
pp. 7-12 ◽  
Author(s):  
Ján Kosiba ◽  
Ľubomír Hujo ◽  
Juraj Tulík ◽  
Milan Rašo
Keyword(s):  
Performance Test ◽  
Slovak Republic ◽  
Flow Characteristics ◽  
Science Research ◽  
Joint Stock Company ◽  
Hydraulic Fluid ◽  
Ministry Of Education ◽  
Hydraulic Pump ◽  
Stock Company ◽  
The Impact

This paper deals with the lifetime test of a tractor hydraulic pump. The basic indicator of hydraulic pump lifetime is flow characteristics. This paper presents the results of the performance test of ecological hydraulic fluid. These results were subjected to statistical analysis. Based on these data, it is possible to express a minimum impact of ecological hydraulic fluid on hydraulic pump lifetime. The test was carried out in cooperation between the Department of Transport and Handling (Slovak University of Agriculture in Nitra) and Slovnaft, a.s. (joint-stock company), and supported by the Scientific Grant Agency of the Ministry of Education, Science, Research and Sport of the Slovak Republic – VEGA, ref. No 1/0857/12.

Investigation of degradation of ecological hydraulic fluid

2021 ◽  
pp. 095440622110329
Author(s):  
Z Tkáč ◽  
Š Čorňák ◽  
J Kosiba ◽  
R Janoušková ◽  
M Michalides ◽  
...  
Keyword(s):  
Flow Characteristics ◽  
Acid Number ◽  
Hydraulic Fluid ◽  
Chemical Contamination ◽  
Hydraulic Pump ◽  
Total Acid ◽  
Scanning Calorimetry ◽  
Operational Test ◽  
Ir Spectroscopic ◽  
The Impact

This article deals on the impact of the ecological hydraulic fluid type hydraulic environmental ester synthetic oil on operation of mini excavator hydraulic circuit. An operational test was to 500 engine hours. Hydraulic fluid is evaluated for chemical contamination. Fluid samples were taken from the mini excavator at 250 engine hours intervals. These samples were subjected to IR spectroscopic analysis, kinematic viscosity measurements at 40° C and 100° C, total acid number measurement and differential scanning calorimetry. It was found that the ecological hydraulic oil does not influence the operation of the mini excavator. Based on the achieved results, it was shown that the degradation processes during the operational test of the ecological fluid do not affect the operating parameters of the monitored machine. The presented paper also presents the results of the influence of hydraulic on the flow characteristics of the hydraulic pump.

scholarly journals Evaluation of the Quality of Irrigation Machinery by Monitoring Changes in the Coefficients of Uniformity and Non-Uniformity of Irrigation

Agronomy ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1499
Author(s):  
Ján Jobbágy ◽  
Peter Dančanin ◽  
Koloman Krištof ◽  
Juraj Maga ◽  
Vlastimil Slaný
Keyword(s):  
Repeated Measurements ◽  
Joint Stock Company ◽  
Stock Company ◽  
Uniformity Coefficient ◽  
Quality Of Work ◽  
Total Length ◽  
Irrigation Uniformity ◽  
Wide Range ◽  
The Impact

Recently, the development of agricultural technology has been focused on achieving higher reliability and quality of work. The aim of the presented paper was to examine the possibilities of evaluating the quality of work of wide-area irrigation machinery by monitoring the coefficients of uniformity and non-uniformity of irrigation. The object of the research was pivot irrigation machinery equipped with sprinklers with a total length from 230 to 540 m. The commonly applied quality of work parameter for wide-range irrigators is the irrigation uniformity coefficient according to Heermann and Hein CUH. Work quality evaluations were also carried out through other parameters applicable in practice, such as irrigation uniformity coefficients calculated according to Christiansen CU, Wilcox and Swailes Cws, and our introduced parameters, the coefficient ar (derived from the degree of unevenness according to Oehler) and the degree of uniformity γr (derived from the degree of non-uniformity according to Voight). Other applied parameters for determining the quality of work of wide-range irrigation machinery were the coefficients of irrigation uniformity according to Hart and Reynolds CUhr, further according to Criddle CUcr and subsequently according to Beale and Howell CUbr. Next, the parameters of the non-uniformity coefficient according to Oehler a, the coefficient of variation according to Stefanelli Cv, the degree of non-uniformity according to Voigt γ and the degree of non-uniformity according to Hofmeister Ef were evaluated. Field tests were performed during the growing season of cultivated crops (potatoes, corn and sugar beet) in the village of Trakovice (agricultural enterprise SLOV-MART, southwest of the Slovakia) and in the district of Piešťany (Agrobiop, joint stock company). During the research, the inlet operating parameters (speed stage, inlet pressure, irrigation dose), technical parameters (number of sprayers, total length, number of chassis) and weather conditions (wind speed and temperature) were recorded. The obtained results were examined by one-way ANOVA analysis depending on the observed coefficient or input conditions and subsequently verified by Tukey and Duncan tests as needed. Irrigation uniformity values ranged from 67.58% (Cws) to 95.88% (CUbh) depending on the input conditions. Irrigation non-uniformity values ranged from 8.58 (a, Ef) to 32.42% (Cv). The results indicate a statistically significant effect of the site of interest and thus the impact of particular field conditions (p < 0.05). When evaluating the application of different coefficients of irrigation uniformity, the results showed a statistically significant effect only in the first test (p = 0.03, p < 0.05). During further repeated measurements, the quality of work increased due to the performed inspection of all sprayers and the reduction in the influence of the wind.

scholarly journals The impact of functional groups of the surface of carbon materials on the efficiency of purification of extraction phosphoric acid from fluorine compounds

2019 ◽  
Vol 2 ◽  
pp. 11-18
Author(s):  
Smirnov N.N. ◽  
Konoval A.V. ◽  
Smirnova D.N. ◽  
Kochetkov S.P.
Keyword(s):  
Phosphoric Acid ◽  
Functional Groups ◽  
Carbon Materials ◽  
Raw Materials ◽  
Carbon Adsorbents ◽  
Joint Stock Company ◽  
Stock Company ◽  
Fluorine Compounds ◽  
The Impact ◽  
Extraction Phosphoric Acid

The environmental problems of the production of extraction phosphoric acid and the effect of fluorine on the human body are discussed in the article. The creation of the industry of phosphoric fertilizers on the basis of processing of fluorine-containing phosphate raw materials and fluorine-containing compounds, the development of their application require the study of environmental consequences arising from this, because fluorine is characterized by high mobility in the biological cycle of metabolism. For the purification of phosphoric acid from fluorine was used carbon adsorbents such as active charcoal brand BAU, natural graphite deposits Kyshtymsky, P514 soot, charcoal. Experiments on the purification was carried out on non-evaporated half-hydrated extraction phosphoric acid which was produced by joint stock company «Apatit» in Cherepovets city in Russia. The following analyses were carried out: IR-Fourier spectrometry, research of acid–base properties of carbon materials by potentiometric titration, potentiometric method of fluorine determination in extraction phosphoric acid. It is mentioned that the carbon black P514 is the most efficient adsorbent for purification of extraction phosphoric acid. The total number of functional groups on its surface is 0.62 mmol/g, the degree of purification from fluorine compounds is 94.8%.

scholarly journals Impact of Cost Control on Business Efficiency of Small and Medium Sized Enterprises in Thai Binh, Vietnam

2017 ◽  
Vol 4 (2) ◽  
pp. 112
Author(s):  
Ngoc Hung Dang ◽  
Thi Viet Ha Hoang ◽  
Manh Dung Tran
Keyword(s):  
Firm Size ◽  
Cost Control ◽  
Joint Stock Company ◽  
Financial Leverage ◽  
Stock Company ◽  
Return On Assets ◽  
Expense Ratio ◽  
Business Efficiency ◽  
Return On Sales ◽  
The Impact

This study is conducted for investigating the impact of cost control on business efficiency of small and medium-sized enterprises (SMEs) in the area of Thai Binh, Vietnam for the period from 2012 to 2014. Impacting factors were built and verified on business efficiency of SMEs including (i) Cost of goods sold ratio, (ii) Financial expense ratio, (iii) Administration expense ratio, (iv) Firm size, (v) Financial leverage, (vi) Assets structure, and on Pre-tax return on sales ratio and Pre-tax return on assets ratio. The study employed regression models of OLS, FEM, REM and GLS with multi-year dataset of SMEs in Thai Binh province. The results show that the ratios of cost of goods sold, financial leverage, and administration expenses have negative relation with business efficiency, but affecting Return on sales (ROS) and Return on assets (ROA). In addition, financial leverage, assets structure and firm size have small impacts on ROS and ROA. Also, basing on the findings, SMEs operating in the form of joint stock company have higher business efficiency than those operating in the form of limited liability company.

scholarly journals TECHNICAL EFFICIENCY AND ITS DETERMINANTS IN THE SPANISH CONSTRUCTION SECTOR PRE- AND POST-FINANCIAL CRISIS

2015 ◽  
Vol 19 (1) ◽  
pp. 96-109 ◽  
Author(s):  
Magdalena KAPELKO ◽  
Alfons OUDE LANSINK
Keyword(s):  
Financial Crisis ◽  
Technical Efficiency ◽  
Joint Stock Company ◽  
Construction Sector ◽  
Truncated Regression ◽  
Stock Company ◽  
Construction Firms ◽  
Efficiency Measures ◽  
Before And After ◽  
The Impact

This paper estimates technical efficiency in the Spanish construction sector before and after the start of the current financial crisis, and examines the impact of socio-economic factors on technical efficiency. Bias-corrected efficiency measures are obtained using Data Envelopment Analysis with bootstrap for a sample of medium-sized and large construction firms over the period 2000–2010. Next, bias-corrected efficiency scores are regressed on the variables explaining efficiency using bootstrap truncated regression. The results show that technical efficiency is very low and is significantly lower after the beginning of the financial crisis than before. Firms with the highest technical efficiency scores have the lowest input-ratio for material and employee costs to output and the highest for fixed assets. The examination of the determinants of technical efficiency indicates that efficiency is higher for firms that export, are highly leveraged, are integrated in the form of joint stock company, and are located in Spanish regions with higher GDP per capita, while firms with high stock relatively to turnover have lower technical efficiency. Technical efficiency increases with size for relatively small sized construction firms, but decreases beyond a critical firm size, while technical efficiency decreases with age for young firms, but eventually increases for older firms.

scholarly journals Research of building structures in extreme climate conditions

2019 ◽  
Vol 14 (2) ◽  
pp. 127-136
Author(s):  
Dušan Katunský ◽  
Lenka Kabošová ◽  
Erika Dolníková ◽  
Marek Zozulák
Keyword(s):  
Slovak Republic ◽  
Science Research ◽  
Building Structures ◽  
Ministry Of Education ◽  
Climate Conditions ◽  
Grant Agency ◽  
Project Objectives ◽  
Academy Of Sciences ◽  
Education Science ◽  
Vega 1

AbstractThe paper provides information on the solution of project supported by the Scientific Grant Agency of VEGA of the Ministry of Education, Science, Research and Sports of Slovak Republic and of the Slovak Academy of Sciences of Slovak Republic. There is project: VEGA 1/0674/18. This research project is programmed for the years 2018 to 2021. In this paper are presented information on the results obtained in 2019, solution of this project objectives and project solution. The results are presented in realized publications. We focused mainly on the presentation of major publications, articles in domestic and foreign journals, articles in conference proceedings with an emphasis on publications that are indexed in the WOS and SCOPUS databases.

scholarly journals Simulation of hydraulic pump load in laboratory conditions

2021 ◽  
Vol 351 ◽  
pp. 01005
Author(s):  
Ľubomír Hujo ◽  
Romana Janoušková ◽  
Štefan Čorňák ◽  
Juraj Tulík
Keyword(s):  
Laboratory Test ◽  
Working Hours ◽  
Hydraulic Fluid ◽  
Agricultural Machinery ◽  
Hydraulic Pump ◽  
Scientific Contribution ◽  
Energy Carriers ◽  
Laboratory Conditions ◽  
Limit Test ◽  
The Impact

The aim of the scientific contribution is simulating the load of gear hydraulic pump used in agricultural machinery in laboratory conditions, where the impact of ecological transmission-hydraulic fluid on life limit (flow and efficiency) of gear hydraulic pump GHD1-17R is monitored. Laboratory test equipment was used for the simulation. The equipment was used to perform life limit test of hydraulic pump and to monitor changes in physicochemical ecological energy carriers. The simulation in laboratory conditions took 500 hours. The Vickers test took 100 hours. Transmission-hydraulic fluid MOL Farm NH Ultra was used for simulation. The results were that fluid is appropriate to use in this type of hydraulic pump in agricultural machineries. According to the Vickers test, the fluid is characterized by an increased value of flow and efficiency after 50 working hours, thereby exceeding the specified test values.

scholarly journals The Ways to Optimize Costs of Enterprise on the Example of PJSC «Ukrainian Railways»

2020 ◽  
Vol 11 (514) ◽  
pp. 282-287
Author(s):  
I. V. Nagorna ◽  
◽  
Y. Y. Halkina ◽  
Keyword(s):  
Economic Activity ◽  
Structural Changes ◽  
Cost Management ◽  
Optimal Level ◽  
Joint Stock Company ◽  
Net Income ◽  
Stock Company ◽  
Composition And Structure ◽  
The Impact

The article is aimed at finding ways to optimize costs at the production subdivision «Operational wagon depot Kupyansk» of the Regional division «Southern Railway» of the Private Joint Stock Company «Ukrainian Railways» on the basis of the performed analysis of the composition and structure of costs, profitability, the impact of the amount of costs on performance indicators, the level of costs per 1 UAH of the consummated services, and operational analysis. The views of scholars on the term «costs» are explored. It is defined that cost management is quite a complex and important process in the course of carrying out economic activity along with determining the quality of further results of enterprise. The main methodological bases of cost management, economic condition of the enterprise are researched. Optimization measures for further development of the enterprise are proposed, which will allow to use its resources more efficiently, to achieve an increase sales and maximize profits. The authors provide recommendations on managing the enterprise costs in order to stimulate the growth of competitiveness. The focus is placed on the mechanism of minimizing the costs of the enterprise in the total amount of net income, because efficient use of costs can not be carried out without structural changes in the sphere of their management. It is identified that cost management is an interconnected complex of works, which forms and influences the behavior of costs during economic activity, as well as is aimed at achieving the optimal level of costs. The proposed measures as to optimizing costs can be used by directors and managers of the enterprise to make informed decisions on the prospective development of the enterprise.

scholarly journals Implementation of Global Development Education into the Curriculum at the Faculty of Economics and Management, Slovak University of Agriculture

2014 ◽  
Vol 6 (2) ◽  
pp. 43-61
Author(s):  
Eva Svitačová ◽  
Anna Mravcová
Keyword(s):  
Slovak Republic ◽  
Current System ◽  
Science Research ◽  
Global Dimension ◽  
Educational Process ◽  
Ministry Of Education ◽  
Global Development ◽  
Development Education ◽  
Educational Approach ◽  
Education Science

The new phenomenon of global development education (GDE) has gradually penetrated the curricula in Slovakia. For the purpose of more comprehensively preparing future economic actors, who will operate in the new global economic and social environment, we have decided to incorporate this topic into the curriculum at the Faculty of Economics and Management, Slovak University of Agriculture (FEM SUA). The national research project KEGA, supported by the Slovak Republic 's Ministry of Education, Science, Research, and Sport, is also focused on this issue. Its objective is to develop a more comprehensive and current system of GDE for economic faculties in Slovakia, and to propose appropriate methods for its implementation into the educational process. This paper presents information about how the various themes and issues associated with the new educational approach are implemented into the curriculum at FEM SUA, as well as information on what new measures are proposed and are currently being gradually realized in order to clarify to the students the global dimension of processes and phenomena. The project is based on qualitative research undertaken via the study and analysis of public documents and of audio and video recordings made of faculty and at national discussion workshops. Through the analysis of individual discussions we identify not only the appropriate content of GDE within economics faculties but also the most appropriate forms for its implementation into the educational process at FEM SUA and at other economics faculties in Slovakia.

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