Archives for Technical Sciences

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ISSN / EISSN : 1840-4855 / 2233-0046
Total articles ≅ 214
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ESCI
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Zehra Salkić, Elvir Babajić, Boško Lugović
Archives for Technical Sciences, Volume 1; https://doi.org/10.7251/afts.2021.1324.017s

Abstract:
Magmatic rocks of post-Late Eocene magmatic formation are widespread in the Sava segment of Sava- Vardar suture zone and adjoin areas. The rocks formed as a response to transpressional-transtensional tectonic activity preceded by the Cretaceous-Eocene compression of the Internal Dinarides and Tisia Unit as fragments of Eurasian continental lithosphere. Central Bosnia Tertiary volcanic rocks (CBTVR), erupted as dacites in Lower Oligocene, are peculiar rocks of this formation either by their location (southernmost distal outcrops) or geological setting (extrusive within the melange of the Internal Dinaride Ophiolite Belt). Major element composition of the CBTVR reveals high-K calc-alkaline geochemical affinity whereas trace element discriminate the rocks as shoshonitic. The rocks are LILE-enriched and show negative Ta- Nb, P and Ti anomalies, and positive Pb anomalies typical of subduction related volcanic rocks. Chondrite-normalized REE patterns exhibit significant LREE/HREE enrichment [(La/Yb)cn = 21.4 - 33.4]. Geochemical affinity of the CBTVR combined with tectonic position of extrusions suggests derivation of the melts from the subcontinental mantle which had inherited strong orogenic signature during an ancient subduction.
Vladimir Malbašić, Duško Torbica, Dražana Tošić, Jovan Popović
Archives for Technical Sciences, Volume 1; https://doi.org/10.7251/afts.2021.1324.031t

Abstract:
One of the most important influencing factors on the economy of mines with surface and underground exploitation is the correct choice of haulage technology of ore and waste. The paper analyzes the haulage of ore and waste in the Lead and Zinc Mine "Sase" Srebrenica and determines the optimal haulage length on the four excavation blocks for the application of the new haulage system by using the mine trucks from the aspect of set criteria, increasing capacity and reducing haulage costs through the techno - economic analysis and optimization.The optimal haulage length is determined through the calculations of the loader capacity and the possible choice of the truck depending on the stated criteria.
Alexandr Danilov, Vladimir Babenko, Dmitrii Vasenin, Valery Krysanov
Archives for Technical Sciences, Volume 1; https://doi.org/10.7251/afts.2021.1324.009b

Abstract:
The article considers the issues of increasing energy efficiency of 6-10 kV controlled capacitor plants of power supply systems of energy-intensive facilities due to more accurate compensation of reactive power. Analysis of the most common circuits for connecting batteries of static capacitors using semiconductor and electromechanical switches was carried out. The feasibility of using a simplified approach of determining the optimal structure of the power part of high-voltage plants for compensation of reactive power according to the criterion of minimum cost and minimum level of electric energy losses is determined. The possibility of parametric optimization of high-voltage capacitor batteries to higher voltage levels is shown, taking into account the given specific requirements of these electric power facilities.
Dževad Forčaković, Rejhana Dervišević
Archives for Technical Sciences, Volume 1; https://doi.org/10.7251/afts.2021.1324.039f

Abstract:
This paper presents research results of the Bugojno coal basin, which contains very significant, but still insufficiently explored lignite reserves. Based on the determined borders of surface distribution and the research results in the northwestern part of the Bugojno coal basin, proved are four coal layers with reserves of over one billion tons of coal. Discussed are geological characteristics of coal layers, their qualitative-quantitative characteristics, spatial potential of deposit and classification of coal layers. Considering the raw material potential and the possibility of expanding the existing raw material base, the Bugojno coal basin has particular importance for the long-term development of lignite exploitation and its use for thermal energy purposes.
Ekaterina Prokshits, Sergey Gridnev, Olga Sotnikova, Iana Zolotukhina
Archives for Technical Sciences, Volume 1; https://doi.org/10.7251/afts.2021.1324.051g

Abstract:
The task was set, due to the capabilities of modern software systems, to assess the effect of the increase in inelastic deformations under prolonged load action on the loss of stability of thin-walled dome coverings. The study of the dependences of the forms of the loss of stability of dome covering from creep concrete that will help further with optimization calculations when determining of the most influencing parameters of designs. Calculation results of thin-walled concrete dome roof of circular outline under the influence of operational loadings with use of two modern program complexes are given in article. It is investigated intense and deformation condition of dome coverings as a part of construction from position of forecasting of possible forms of loss of stability, with use of opportunities of the final and element «MidasCivil» computer system. In work provisions of the theory of elasticity, mechanics of deformation of solid body, construction mechanics and also methods of mathematical modeling based on application of finite element method are used. The received results give the chance to rationally select geometrical parameters and material of design and also to set structural strength safety factors at the solution of problems of stability of different covers taking into account possible creep of material.
Ivan Stojanović, Aleksandar Manić, Silvana Ilić
Archives for Technical Sciences, Volume 1; https://doi.org/10.7251/afts.2021.1324.083s

Abstract:
Banana is a climacteric fruit that undergoes a ripening process in airtight chambers at a certain temperature, appropriate ethylene concentration, and the time it takes for the fruit to reach maturity level 4 on the ripening scale. For commercial purposes an ethylene concentration of 1000 ppm is used, and depending on other factors the concentration may vary. Through a research the best result has been achieved with an ethylene concentration of 900 ppm and the fruit exposure to 18C for a treatment period of 120 h. These parameters reduced costs by RSD 91.896,95 at annual level compared to the commercial concentration of ethylene, the quality of the fruit did not deteriorate greater efficiency in business has been achieved.
Iveta Štyriaková, Zuzana Danková, Ľubica Kovaničová, Katarína Čechovská, Marián Košuth, Jaroslav Šuba, Jarmila Nováková, Patrik Konečný, Ľubomír Tuček, Katarína Žecová, et al.
Archives for Technical Sciences, Volume 1; https://doi.org/10.7251/afts.2021.1324.065d

Abstract:
This study presents results of chemical leaching of contaminated soil from several metallurgically loaded locality of Richnava in Slovakia, applying two chelants – Na2EDTA and Na3EDDS of different molar concentration, done at different leaching conditions. The lower molar concentration (2 mM) of chelants showed comparable effect on Mn, Ni, As, Sb and Co leaching. Higher extraction was revealed at application of 10 mM chelants, especially for Cu and Cd release. Repeated washing of soil by 10 mM chelant without the media regeneration was more effective at the toxic elements removal than washing by smaller volumes of media or leaching of soil in static conditions. Final experiments focused on obtained leachates treatment showed that electrolysis and precipitation should represent a perspective way of the washing media regeneration.
Iana Zolotukhina, Semen Podvalny, Olga Sotnikova, Ekaterina Prokshits
Archives for Technical Sciences, Volume 1; https://doi.org/10.7251/afts.2021.1324.001p

Abstract:
Currently, the development of the country's economy is characterized by the trend of globalization, which is constantly developing, modernizing, acquiring new forms and features, which ultimately radically changed the way of the world economy. The task was set to analyze and propose options for improving the investment attractiveness and efficiency of the functioning of the special economic zone of the industrial and production type "Center" in the Voronezh Region. The analysis of the existing territory was carried out, as a result of which the weaknesses and opportunities for modernization and development of the zone as a whole were identified. The article presents proposals for increasing and reorganizing the territory, develops a development plan, and suggests ways to attract customers and investments from an architectural and construction point of view. The levels of interaction between humans and the architectural and landscape environment are studied, and the key points of development are identified. The results obtained make it possible to apply and evaluate according to these criteria with the specified characteristics, using the design code development methodology to increase the efficiency of the territory's functioning.
Nedim Suljić
Archives for Technical Sciences, Volume 1; https://doi.org/10.7251/afts.2021.1324.057s

Abstract:
This paper presents an analysis of water flow and flow velocity in an open channel of rectangular cross section as a function of channel roughness, ie Manning roughness coefficient. Three different cases of finishing the open channel of rectangular cross-section were analyzed, namely the concrete channel, the channel with smoothed cement mortar and the channel in very poor condition with shore erosion overgrown with sedges and large stones at the bottom of the channel. Analyzes were performed on a rectangular channel 3.0 m wide and with water depths in the channel from 0.5 m to 1.5 m with a step of 0.1 m, for steady flow. The longitudinal fall of the bottom of the rectangular channel in all analyzed cases was 1%.u urađene na pravougaonom kanalu širine 3,0 m i sa dubinama vode u kanalu od 0,5 m do 1,5 m sa korakom od 0,1 m, za ustaljeno tečenje. Podužni pad dna pravougaonog kanala u svim analiziranim slučajevima je iznosio 1%. The paper showed that higher Mannig roughness coefficients give lower water flow in the canal. The importance of the paper is reflected in the fact that for each of the three analyzed treatments of the rectangular channel, a quadratic function of water velocity and flow depending on the water depth in the channel was obtained. During the hydraulic calculation, the type of lining of the open rectangular channel should be taken into account in order for the dimensioned channel to be the most favorable in terms of maximum throughput.
Tomáš Bakalár
Archives for Technical Sciences, Volume 1; https://doi.org/10.7251/afts.2021.1324.073b

Abstract:
Chromium, ammonium, and potassium compounds are pollutants in the environment released mainly by industrial wastewater and they can negatively influence the quality of surface water. Zeolites and bentonites are commonly used adsorbents for removal of pollutant from water. In the study, the adsorbents were used in their natural form, without chemical modification for adsorption of Cr(VI), K(I) and NH4(I) from K2CrO4, K2Cr2O7 and (NH4)2CrO4 in a single compound system for each adsorbate separately. The Langmuir isotherm provided the best correlation for the adsorption onto the zeolites and bentonites. The adsorption capacities of bentonites were higher than the adsorption capacities of zeolites from all the used adsorbates. The maximum sorption capacities of K(I) from K2CrO4 were approximately the same. The maximum sorption capacities of K(I) from K2Cr2O7 and NH4(I) from (NH4)2CrO4 were higher for zeolites than for bentonites. The adsorption of Cr(VI) in the form of anions is preferred to the adsorption of cations. The zeolites and bentonites were found to be suitable adsorbents for removal of Cr(VI) from aqueous solutions.
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