bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Role of Big Data in Industry 4.0 in Mining Industry in Serbia
Authors: Tylečková Eva , Noskievičová Darja 
Published: May 2020

Abstract
The current age characterized by unstoppable progress and rapid development of new technologies and methods such as the Internet of Things, machine learning and artificial intelligence, brings new requirements for enterprise information systems. Information systems ought to be a consistent set of elements that provide a basis for information that could be used in context to obtain knowledge. To generate valid knowledge, information must be based on objective and actual data. Furthermore, due to Industry 4.0 trends such as digitalization and online process monitoring, the amount of data produced is constantly increasing – in this context the term Big Data is used. The aim of this article is to point out the role of Big Data within Industry 4.0. Nevertheless, Big Data could be used in a much wider range of business areas, not just in industry. The term Big Data encompasses issues related to the exponentially growing volume of produced data, their variety and velocity of their origin. These characteristics of Big Data are also associated with possible processing problems. The article also focuses on the issue of ensuring and monitoring the quality of data. Reliable information cannot be inferred from poor quality data and the knowledge gained from such information is inaccurate. The expected results do not appear in such a case and the ultimate consequence may be a loss of confidence in the information system used. On the contrary, it could be assumed that the acquisition, storage and use of Big Data in the future will become a key factor to maintaining competitiveness, business growth and further innovations. Thus, the organizations that will systematically use Big Data in their decision-making process and planning strategies will have a competitive advantage.
The Use of Navigation in Operations Supporting Drilling Processes
Authors: Kuryło Piotr , Cyganiuk Joanna , Krzysztof Góra 
Published: May 2020

Abstract
The paper presents the analysis of navigation processes used in wells and around-drilling processes. Most common navigation systems used in drilling processes are described. The authors have presented a concept of applying navigation to operations supporting drilling processes, including operations ensuring the safety of drilling staff. Also, they have discussed around-drilling processes which have not been supported by navigation systems. Finally, they have presented ideas of their possible applications as well as benefits resulting from using navigation systems.
Corrosion Resistance of SiMo- and SiCu-Types of Nodular Cast Iron in NaCl Solution
Authors: Vaško Alan , Zatkalíková Viera , Kaňa Václav 
Published: May 2020

Abstract
Nodular cast irons are used in a wide range of industrial applications, especially in the automotive industry. SiMo-type of nodular cast iron is suitable for high-temperature applications, for example the exhaust manifolds of the combustion engines; SiCu-type of nodular cast iron is used in various components of tribotechnical units. These automotive components often work in a corrosive environment. Therefore, the aim of this paper is to compare the corrosion resistance of two types of the nodular cast irons (SiMo-type and SiCu-type). Corrosion resistance was determined by the exposure immersion test at ambient temperature. Specimens of both types of nodular cast iron were immersed in 3.5 % NaCl solution (to simulate sea water) and gradually removed from the solution after 1, 2, 4 and 8 weeks. Subsequently, the weight loss (g) and the average corrosion rate (g m−2 day−1) were calculated. Experimental results show that nodular cast iron alloyed by Si and Mo has higher corrosion resistance than the nodular cast iron alloyed with Si and Cu. Moreover, the mechanical properties (evaluated by tensile test, impact bending test and hardness test) and fatigue properties of both types of nodular cast iron has been compared in the paper.
The Impact of the Agressive Acid Environment on RC Constructions
Authors: Blikharskyy Yaroslav , Khmil Roman , Blikharskyy Zinoviy , Shnal Taras 
Published: May 2020

Abstract
The main issue of the article is the corrosion of the reinforced concrete elements by the co-influence of the aggressive and power factors. The problem of corrosion is ex-tremely actual one. Therefore the tests were carried out upon the specimens considering the corrosion in the acid environment, namely 10 % H2SO4. The acid environment H2SO4 was taken as a model of the aggressive environment. Conclusions concerning the corrosion model of the cross section and investigation of stress-strain state have been made. That material concerns the problem of the reinforced concrete corrosion as a whole construction. Reinforced concrete beams were tested with and without the co-action of the aggressive environment and power factor.
Determination of the Optimum Percentage of High Strength Bars in RC Beams with Combined Reinforcement Using Fem
Authors: Selejdak Jacek , Blikharskyy Yaroslav , Bobalo Taras , Kopiika Nadiia 
Published: May 2020

Abstract
In this work on the basis of the developed and tested mathematical model, the numerical experiment is conducted in order to study in more detail the specifics of performance of concrete beams` with combined reinforcement. For this purpose nine series of reinforced concrete beams with different combination of steel bars (A400C, At800, A1000) and ribbon reinforcement (C275) were modeled. In the developed series two classes of concrete were used: C50/60, C35/45. The functions derived on the basis of mathematical modeling allow us to determine the recommended percentage of high-strength reinforcement of common reinforced concrete structures with single reinforcement. Therefore, the possibility is obtained to reduce the total structures` reinforcement percentage, increasing their deformability by the specified value without affecting the bearing capacity.
Production of Zinc Coatings by Electro-Spark Deposition
Authors: Radek Norbert , Pietraszek Jacek , Klimecka-Tatar Dorota 
Published: May 2020

Abstract
The paper describes the method of producing a zinc coating on steel by electro-spark deposition technology. The technology of applying electro-spark zinc to the surface was presented. Microscopic observations and corrosion resistance tests were made. The possibilities of practical application of this type of coatings in the process of repairing zinc coatings, either damaged or with manufacturing defects, were analyzed.
Safety and Automatization of Machining Line
Authors: Fíla Ondřej , Sellner Karel , Vysloužilová Daniela , Klimecka-Tatar Dorota 
Published: May 2020

Abstract
the paper deals with problematic of machining lines of machine components for the automotive industry. There is a current issue of increasing labor productivity and economic efficiency of production with full safety of production and environmental protection. Therefore, for a specific practical assignment, the replacement of existing machinery using manual workpiece handling is performed by a fully automated safety-accessible one. For this purpose, an analysis of the technical and operating parameters of the proposed NC machines has been prepared. Attention is paid to optimization of material flow and arrangement of individual workplaces of production machines including handling and transfer of material between individual workplaces. Particular attention is paid to the safety of workers and improves the environmental conditions of the production plant. Finally, the overall efficiency of the proposed solution is evaluated in detail compared to the current solution.
Creating of Transnational Cooperation Network as a Factor of Competitiveness
Authors: Kiełbus Anna , Karpisz Dariusz 
Published: May 2020

Abstract
The paper presents good practices and selected problems of creating cooperation networks. The basics of creating and disseminating new forms of cooperation between enterprises and universities have been described. Based on the implemented international project “3DCentral - Catalyzing Smart Engineering and Rapid Prototyping”, selected conclusions from creating network and management of many project activities including innovative technologies are presented.
Threats in Cyber Safety - Outline of the Problem
Authors: Gliń Wojciech , Stasiak-Betlejewska Renata 
Published: May 2020

Abstract
Currently, the industry is called as Industry 4.0, Internet of Things, Industrial Internet of Things, where devices, machines, information, organizations and people are connected to the network. Every day meet new solutions for Industry 4.o can be met, but in parallel with these solutions there are also threats in the field of security of industrial networks. Such threats have been called cyber-attacks or cyber threats. Cybersecurity is the global name of a field aimed at counteracting all types of threats on the web. Cybersecurity is to raise awareness, inform, control and introduce solutions to counteract cyber threats. Enterprises, organizations dealing with the promotion of Industry 4.0, IoT, IIoT, form the appropriate groups, departments, companies whose goal is to counteract all types of cyber-attacks. At present, the thesis can be formulated that cybersecurity of the broadly understood network is more important than the implementation of Industry 4.0. The publication will attempt to present the threats that cybersecurity enterprises must face and the ways and methods to counter them.
The Pre-Service Teachers’ Attitudes Towards Inclusive Education: An Empirical Study in Yogyakarta City, Indonesia
Authors: Ediyanto  , Maulida Restuti , Atika Iva Nandya , Kawai Norimune 
Published: May 2020

Abstract
The pre-service teachers’ attitudes is one indicator to show whether the inclusive education system is successfully implemented. However, no research studies have been conducted to reveal pre-service teachers’ attitudes towards inclusive education in Indonesia. Therefore, the purpose of this study was to know the attitudes towards inclusive education of pre-service teachers in Indonesia. The current study investigated 177 Indonesian pre-service teachers who have studied the inclusive education course in Yogyakarta city using the teachers’ attitudes towards inclusion scale. The findings of the current study were 1) the pre-service teachers had moderate attitudes and beliefs towards inclusive education, 2) there were no differences in attitudes toward inclusive education between males and females, and between those who have never interacted with students with special education needs and those who have such experiences.
Electrical Conductivity and pH in Surface Water as Tool for Identification of Chemical Diversity
Authors: Potapowicz Joanna , Szumińska Danuta , Szopińska Małgorzata , Czapiewski Sebastian , Polkowska Żaneta 
Published: May 2020

Abstract
In the present study, the creeks and lakes located at the western shore of Admiralty Bay were analysed. The impact of various sources of water supply was considered, based on the parameters of temperature, pH and specific electrolytic conductivity (SEC
25). All measurements were conducted during a field campaign in January–February 2017. A multivariate dataset was also created and a biplot of SEC
25 and pH of the investigated waters was performed. The average temperatures of the investigated waters were 0.10-8.10 °C. The pH values indicate that most of the water environments of the analysed area are slightly acidic to alkaline (5.26–8.50) with two exceptions: Siodlo II Creek (9.26) and Petrified Forest Creek (8.95), which are characterised by greater alkalinity. At the measurement points closest to the Baranowski Glacier and Ecology Glacier, SEC
25 values were the lowest (26.8–61.1 µS·cm–1), while the remaining values ranged from 79.0 to 382 µS·cm–1 for the whole studied area. Based on the results it is concluded that the periodic intensive inflow of ablation waters, combined with morphological changes in the glacier front, causes a significant variability in the outflow network, creating the conditions for changes in basic physicochemical parameters. Moreover, it is observed that local depressions in the terrain form sedimentation traps in which, alongside fine-grained deposits, compounds can accumulate that originate from in situ sedimentation and that are also associated with surface runoff from the melting of snow cover, buried ice and permafrost.
Treatment of Leachate Using Up-Flow Anaerobic Sludge Blanket Reactors/Vertical Flow Subsurface Constructed Wetlands
Authors: Tulun Şevket 
Published: May 2020

Abstract
The composition of local solid waste consists mainly of biodegradable waste with high moisture and organic content. After being landfilled, the waste decomposes through a series of combined physico-chemical and biological processes, resulting in the generation of landfill leachate. Unless treated properly, the leachate poses a serious threat to the environment and to public health. In this study, the use of an engineered system consisting of an up-flow anaerobic sludge blanket reactor and a vertical flow subsurface constructed wetland for the treatment of landfill leachate was investigated. The leachate obtained from a landfill facility in Aksaray, Turkey was fed into both systems and laboratory tests showed that, over the 6-week study period, the systems were able to efficiently remove chemical oxygen demand (88.6 %) and total nitrogen (80.7 %). The results of this study suggested that Typha angustifolia significantly increased the removal of total nitrogen. The higher ammonia removal occurred in the anaerobic system and also the removal efficiency increased in planted bed, it is presumed to be the result of the ammonia nitrogen uptake by the roots of the plant.
Influence of Digested Sludge Conditioning on the Dewatering Processes and the Quality of Sludge Liquid
Authors: Bień Beata , Bień Jurand D. 
Published: May 2020

Abstract
To increase the dewatering effect, sewage sludge should be properly prepared before dewatering. Sludge conditioning is a process whereby sludge solids are treated with chemicals or various other means to improve dewatering characteristics of the sludge by reducing the specific resistance and compressibility of the sludge. The aim of the research was to determine the possibility of increasing the efficiency of sewage sludge dewatering by applying chemical agents and ultrasonic field. Some parameters, such as suspension, chemical oxygen demand (COD), phosphorus and ammonium nitrogen content in sludge supernatant, were also analysed. Digested sludge belonged to the group of hardly dewatered sludge, its capillary suction time (CST) was of high value (2639 s). The lowest CST value (88.5 s) was obtained for the unsonicated sludge prepared only with PIX 113 at a dose of 7.0 mg/g d.m. Both the dose and the type of chemicals used, as well as the time of sonication, had an impact on the changes occurring in sludge properties. The increase in mechanical dewatering efficiency was obtained by using a combination of methods applied for sludge preparation, where the sonication of sludge was used at the preliminary stage and followed by dosing chemical substances. This resulted in the reduction of sludge final hydration and changes of other parameters. In addition, combined action of PIX 113 and Zetag 8180 allowed to reduce the content of suspended solids and COD in sludge supernatant.
The Carbon Footprint of Volunteer Tourism
Authors: Geneidy Sami El , Baumeister Stefan 
Published: May 2020

Abstract
Tourism is growing at a fast rate and so is its carbon footprint. Alongside conventional tourism, a new form of tourism, so-called voluntourism, has emerged. The discussion on voluntourism in the existing literature has hereby mainly centred around its positive impacts on the health and education of communities and the local environment in developing countries. Nevertheless, little attention has been drawn to its climate impacts. This study set out to investigate the carbon footprint of voluntourism. The data were collected at a local non-governmental organisation (NGO) in India working with voluntourists. Both the carbon footprint of the stay in India and that from the round trip by air were taken into consideration. The results showed that although the carbon footprint of voluntourists during their stay is comparable with that of locals, the flight significantly contributes to the carbon footprint of voluntourism. Depending on the distance flown and the length of the stay, the average share of the carbon footprint stemming from the flight can be between 83% and 96%. The article concludes that faraway destinations and short stays should be avoided; otherwise voluntourism might cause more harm than good. On the basis of the findings, this article provides recommendations for policymakers and further research.
A Spatial Approach for Framing the Development of Tourism: Bahía Solano – Colombia
Authors: Gómez Helmuth Yesid Arias , Antošová Gabriela 
Published: May 2020

Abstract
The article explores the natural context and the geographical conditions for developing tourism and for designing sectorial plans. The objective is to offer basic visual rendering as a resource for appreciating the natural environs in which the tourist activity evolves and use such resource as useful input during the planning and designing exercises. The methodology relies on the application of cartographic and spatial tools as instruments for recognising the territory and the natural landscape. The results render the current condition of natural resources and the territorial reality, as a general frame for proposing sustainable strategies of tourism planning. The contribution of the analysis can be appreciated amid the scarcity of local and specific cartographic analysis, and the precarious stock of inputs that could guide the tourism and the territorial planning in lagged territories. An overwhelming conclusion of our exercise is that the awarness and valuations of natural endowments are key elements for preserving the environment and for applying an adequate planning strategy in order to reconcile the economic necessities and the preservation of natural environment.
Change of Circumstances and Force Majeure Clauses in Serbian Legal System and Sources of International Uniform Law
Authors: Ditrih Stefan , Marković Svetlana , Milošević Olgica 
Published: May 2020

Abstract
The effects of globalisation are many. One of them is the effect that globalisation has on commercial contracts and contractual relations between contracting parties. Due to a fast pace of economy and the speed and volume of the conclusion of contracts in international trade, participants must rely on stable and reliable legal framework for contractual obligations. In globalised economy, traders from different countries bring with them individual trade practices and norms of national legislation, often diametrically opposed, and sometimes the legal institutes that are regulated in one country don’t even exist in another. This is the case with the institutes of force majeure and a change of circumstances. Due to large differences in the regulation of these two institutes in national legal systems, there have been demonstrated some attempts of standardisation and creation of a unified system of exemption from liability for non-performance, due to force majeure or a change of circumstances. This problem becomes even more evident when dealing with the long term contracts, which are prone to the effects of unforeseen circumstances. This paper aims to explore the nature of the above mentioned legal institutes in some of the most important sources of international commercial law. With a special attention paid to the Serbian regulatory solutions, in order to further understand the similarities and differences between the national legal systems and sources of international law. The first part of the paper deals with applicable legal framework in Republic of Serbia, concerning force majeure and a change of circumstances. The second part of the paper deals with the international sources of commercial law, such as UN Convention on Contracts for the International Sale of Goods of 1980; UNIDROIT Principles of International Commercial Contracts; Principles of European Contract Law; Draft Common Frame of Reference; and Common European Sales Law.
Overcoming the Effects of Restrictive Fiscal Policy: The Case of Argentina and Serbia
Authors: Todorović Miloš , Marković Ivan , Grahovac Dijana 
Published: May 2020

Abstract
The paper analyses one of the most important economic issues relevant to most countries. The issue involves how to as painless as possible overcome the problems of high budget deficits and excessive accumulated public debt. Argentina and Serbia are used as an example. Argentina implemented rigorous saving measures in 2002 and Serbia began to implement restrictive budgetary measures in 2014. The effects of such a policy can be designed for the future. Results indicate that the key to Argentina’s success lies in the transition to a floating exchange rate and the high level of correlation between the growth of the foreign exchange rate and growth in exports. When comparing strict fiscal policy in Argentina and Serbia, it should be emphasised that the measures in Serbia are far less stringent than those that were established in Argentina. But it also means that the effect of reducing budget expenditures should have less of an impact on GDP reduction than in the case of Argentina.
Revealed Comparative Advantages and Competitiveness of the Manufacturing Industry of the Republic of Serbia
Authors: Ćorović Enes , Gligorijević Živorad , Manasijević Aleksandar 
Published: May 2020

Abstract
Тhе key research questions in this paper are related to determining the effects and impacts of a new economic growth model on the comparative advantages and competitiveness of exports of Serbian technological manufacturing product groups on the EU-28 market. The research used some of the analytical instruments of the methodology developed by the International Trade Center (ITC), as well as a modified RCA index. There was conducted a comparison of results of measuring export competitiveness using the methodology and RCA index according to the Balassa formula. All relevant analyses brought up similar conclusions regarding the modest effects of the reformed growth model, the low level of export competitiveness of medium and high technology products, but also regarding Serbia’s lagging behind its competitors from the immediate surrounding and the world average. The results indicate that Serbia has failed to balance the structure of sources of financing for the new economic growth model, especially in terms of under-representation of domestic, public and private investments. They reflected on the low volume of gross investment, investment in industry in particular, their inadequate structure and the slow growth of export in production sectors, being the most affected by technological progress.