Tomas Bata University in Zlín
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Experimental investigation of absorption shielding efficiency of rubber composites
Get PDFManganese-zinc ferrite, nickel-zinc ferrite and the combination of both fillers were used for fabrication of composites. Then, carbon black was applied in combination with ferrites in the second type of composites. The main goal was to investigate the influence of fillers on absorption shielding efficiency and physical-mechanical properties of composites. It was revealed that incorporation of ferrites into rubber matrix leads to fabrication of composites that are able to absorb electromagnetic radiation. The higher was the amount of nickel-zinc ferrite in fillers combinations, the higher was the absorption shielding performance of composites. The results showed that nickel-zinc ferrite demonstrated better absorption shielding potential. The absorption shielding efficiency of composites filled with carbon black and ferrites was lower when compared to equivalent composites filled only with ferrites, which can be attributed to higher electrical conductivity of composites due to the presence of carbon black. On the other side, the incorporation of carbon black caused the improvement in physical-mechanical properties of composites, mainly the enhancement of the tensile strength, modulus and hardness.Agentúra na Podporu Výskumu a Vývoja, APVV: APVV-16-0136, APVV-19-0091Slovak Research and Development Agency [APVV-16-0136, APVV-19-0091
Determination of mechanical properties of plastic components made by 3D printing
Get PDFThe presented article deals with the determination of selected mechanical properties of additive materials used for 3D printing (PETG, PLA, ABS, ABS +, PLA ESD, ASA, PC / ABS). Due to the fact that 3D printing has exploded over recent years and additive manufacturing has become popular in some industries, the quality of input materials and their mechanical properties is extremely important. We used 3D printer Original Prusa MK3 to prepare samples for testing. Individual samples printed from all above mentioned materials were analyzed using selected mechanical tests (static tensile test, hardness tests). In the static tensile test, selected parameters (tensile strength limit, tensile modulus, elongation) were determined for all additive samples, which were statistically processed. The parameters for two methods of measuring hardness were also statistically evaluated, namely Shore and ball indentation. All tested additive materials were compared with the aim of obtaining the final ranking (point evaluation of tested materials with quantification of price costs). The best properties after the performed tests were achieved by the additive material PLA Filament Plasty Mladec.Univerzita Tomáše Bati ve ZlíněDepartment of Mechanical Engineering, University of Defence in Brno [SV20-216]; Project for the Development of the Organization "DZRO VAROPS"; Tomas Bata University in Zlin [VaV-IP-RO/2022/01
Injection-molded isotactic polypropylene colored with green transparent and opaque pigments
No full textPolypropylene (PP) belongs among the most important commodity plastics due to its widespread application. The color of the PP products can be achieved by the addition of pigments, which can dramatically affect its material characteristics. To maintain product consistency (dimensional, mechanical, and optical), knowledge of these implications is of great importance. This study investigates the effect of transparent/opaque green masterbatches (MBs) and their concentration on the physico-mechanical and optical properties of PP produced by injection molding. The results showed that selected pigments had different nucleating abilities, affecting the dimensional stability and crystallinity of the product. The rheological properties of pigmented PP melts were affected as well. Mechanical testing showed that the presence of both pigments increased the tensile strength and Young's modulus, while the elongation at break was significantly increased only for the opaque MB. The impact toughness of colored PP with both MBs remained similar to that of neat PP. The optical properties were well controlled by the dosing of MBs, and were further related to the RAL color standards, as demonstrated by CIE color space analysis. Finally, the selection of appropriate pigments for PP should be considered, especially in areas where dimensional and color stability, as well as product safety, are highly important.Ministry of Education, Youth and Sports of the Czech Republic [RP/CPS/2022/007]; TBU in Zli
The influence of socially responsible human resource management on green behaviours in the aviation industry
Get PDFMany organizations are facing environmental issues and learning how to improve employee green behavior. However, few researchers have addressed the problem of GFHRM policies from the viewpoint of aviation industry employees. The purpose of this study is to examine the influence of general CSR facilitation human resource management (GFHRM) on green behaviour in the aviation industry and to improve the competitiveness of organisations. Using the social exchange theory, this study looks at the relationships between GFHRM and green behaviour and the mediation of an employee's green work engagement while moderating roles of environmental leadership. The data were gathered from 397 respondents in the aviation industry in Vietnam through the use of the questionnaires on Google Docs. The time-lag technique is used to collect data to avoid common method bias. The results show that GFHRM has a positive relationship with employees' in-role green behavior. Furthermore, GFHRM impacts positively on employees' inrole green behaviors through employee work engagement. Moreover, environmental leadership has a positive moderating influence on the link between GFHRM and employees' in-role green behaviors. The study focuses on CSR practices that put employees first, which have been looked at by a number of aviation industry companies. The importance of leaders in achieving environmental sustainability is shown by our research. This study notably highlights the interaction between GFHRM and environmental leadership on staff's green behaviour while performing their job duties. Employee green work engagement may be best placed to moderate the association between GFHRM and in-role employee green behavior.Univerzita Tomáše Bati ve Zlíně, (IGA/FaME/2022/ 006
Įsa įtaka svarbiems MVĮ žmogiškųjų išteklių valdymo veiksniams V4 šalyse
No full textThe article aims to present important attributes of human resource management in the context of CSR and quantify the differences in the attitudes of SMEs depending on the implementation of the CSR concept in the SME segment of the Visegrad Four countries (V4: Czech Republic, Slovakia, Poland, and Hungary). The fulfilment of the research objective was supported by empirical research conducted in June 2022 in the segment of SMEs in the V4 countries. In this research, the attitudes of SMEs in the field of human resource were investigated in the context of the application of the CSR concept. The data collection was carried out by a renowned external company MNFORCE using "Computer Assisted Web Interviewing" (CAWI Research Method) according to the questionnaire created by the research team. The MNFORCE agency ensured an adequate structure of the respondents in terms of their size and the representativeness of the research in terms of the number of respondents. The selection of respondents was carried out using the method of random selection from the agency's professional database. The research was conducted on a sample of 1,398 respondents who were owners or top managers in the company. Respondents were divided into two groups in each V4 country. In the first group, there were SMEs which answered the statement: When managing the company, I consider the concept of CSR positively (Group A), and in the second group, there were SMEs who answered this statement negatively (Group B). The research results confirmed that Group A has a significantly better approach to Human Resources Management (HRM). This group better evaluates the importance of human capital for the company, perceives the need for HRM within the corporate management system more intensively, regularly evaluates performance and better motivates them to innovate, applies a participative management style to a higher degree and devotes a lot of its time to HRM.Scientific Grant Agency of the Ministry of Education, Science, Research, and Sport of the Slovak Republic; Slovak Academy Sciences; Vedecká Grantová Agentúra MŠVVaŠ SR a SAV, VEGA, (1/0364/22)Scientific Grant Agency of the Ministry of Education, Science, Research, and Sport of the Slovak Republic; Slovak Academy Sciences (VEGA) [1/0364/22]; [NFP313011BWN6
Regional dynamics of two European clusters: Cooperative financial tools and collective support as part of V4 presidencies' foreign approach towards WB6 partners
No full textBased on current paradigmatic, programmatic and operational changes, which oversee how global systems were transformed through inter-actor dynamics and systemic rifts, we can underline the necessity for an in-depth comprehension of the political and economic interactions between regional actors, especially within CEE and the EU’s Neighbouring areas. Thus, as the present paper seeks to address this knowledge hiatus found in the field, there is an extrapolation and interpretation of the Visegrád Group’s (V4) collaborative and cooperative patterns during the last full presidential cycle (Slovak Republic – 2018 to Slovak Republic – 2023). As such, this analysis is aimed at deciphering some of the ways used by the V4 to employ economic measures, as part of collective or individual foreign policy approaches, to further enhance Western Balkan partners’ European trajectories and regional integratory processes, alongside their respective geostrategic and geoeconomic interests. When it comes to the methods utilised in this study, the primary and secondary questions are answered through an extensive collection, selection, and inspection of data produced throughout the V4 presidencies, including: official statements and papers (V4 memorandums, meeting minutes, declarations during the Balkan Forum, official statistics, etc.), specialist literature (academic articles and books, policy analysis, etc.) or related sources (expert groups, op-eds, think-tank reports, etc.). Based on these procedures and forthcoming findings, we can highlight a noticeable increase in the constant economic flows both between the V4 - WB6 (Western Balkans 6) corridor per se and amongst their members, although collective efforts remain highly volatile due to variations in chairmanship. Moreover, the presidencies’ core priorities towards the WB6 seem to follow the general continental pivot regarding the area, with several larger initiatives being spearheaded to optimise interconnectedness between both regions, especially in complementarity with other EU and pan-European projects (e.g., EUSDR, EaP, 3SI, B9). Assuming that the socio-cultural and economic contexts amongst V4 countries are historically close, it is possible to underline that their political environment allows for shared foreign policies to be created, particularly when it comes to enhancing well-founded neighbourhood relations, expanding towards other spheres of interest or assisting non-EU partners in their transition period (driven by their own development processes and good practices).European Development Fund; International Financial Institutions; Ministry of Finance of the Czech Republic; European Bank for Reconstruction and Development, EBRD; European Investment Bank, EIB; Univerzita Tomáše Bati ve Zlíně, (RO/2022/07
Management of operational risk in the context of financial performance of SMEs
Get PDFOwners and managers of small and medium-sized enterprises (SMEs) have changed their perspective on risk management due to the current global negative threats in the business environment. If they want to be successful and ensure the financial performance of their business, they must adopt a proactive approach to reducing strategic risks in connection with operational risks. The aim of the article is to identify and quantify the differences in operational risk management and its effect on the financial management of SMEs between four Central European countries. The statistical sample of SMEs consisted of 1090 owners and top managers. Data collection was carried out through a questionnaire in the period December 2022-January 2023. Statistical hypotheses were evaluated with the application of correlation analysis and linear regression modelling. Empirical findings have confirmed that operational risk management has a significant positive impact on improving the profitability of the enterprise and on reducing the enterprise's indebtedness, as well as in the context of reducing the enterprise's inability to pay its obligations. However, there are disparities in the perception of this influence between owners/managers with regard to the country in which they carry out their business activities. The findings are important for both national and multinational organizations and entities dealing with risk management in the business environment of small and medium-sized enterprises.Ministerstvo školstva, vedy, výskumu a športu Slovenskej republiky; Vedecká Grantová Agentúra MŠVVaŠ SR a SAV, VEGA, (1/0243/20)Scientific Grant Agency of the Ministry of Education, Science, Research and Sport of the Slovak Republic-VEGA [1/0243/20
Predictive control of processes with utilization of artificial intelligence elements
No full textPredictive process control is a method of regulation suitable for controlling various types of systems, which is based on the idea of using the prediction of future system behavior and its optimization. Normally, a system model is used to predict behavior, and therefore it is necessary for the correct function of predictive control to make its correct selection and determine its parameters so that the controlled system is described as accurately as possible. Another advantage of predictive control is the possibility of including signal restrictions directly in the controller. The result is the application of some elements of artificial intelligence in suitable areas of predictive control, especially the use of simple evolutionary algorithms in optimization and neural networks as nonlinear models. One of the chapters of the article describes the possibilities of using these elements. It is proved that in addition to classical optimization algorithms, it is also possible to use simple evolutionary algorithms for optimization of prediction, while the computational complexity can be comparable depending on the type of solved problem and settings. The article describes a suitable selection of model systems with slow dynamics, their derivation, and the creation of nonlinear models in the form of scalable neural networks. The potential advantage of this approach for the control of systems that are difficult to describe or for the control of systems whose mathematical-physical description is not known. The chapter of the article also deals with the possibility of using the found models on real systems and determining the necessary conditions and requirements for their application. © 2020 Danube Adria Association for Automation and Manufacturing, DAAAM. All rights reserved.IGA/CebiaTech/2020/003, IGA/FAI/2020/003; Ministerstvo Školství, Mládeže a Tělovýchovy, MŠMT: LO1303, MSMT-7778/2014; European Regional Development Fund, ERDF: CEBIA-Tech ED2.1.00/03.008
System for e-shop administration
No full textThe main objective of this contribution was design of an application for control of expedition orders and administration of products for an arbitrary e-shop which has had implemented all necessary web services. The application communicates bi-directionally with the e-shop via these web services. A part of the work was also design of web services for an e-shop of one unnamed company. The application code was created in C# language for the Microsoft.NET framework 2.0 and higher. The Microsoft.NET framework and C# language was chosen so that the application could run on various operating systems. The application can be used on Linux or Mac platforms with the Mono framework by Novell. The web services in the e-shop application were implemented using PHP language
WiFi module for autonomous monitoring system
No full textThe WiFi Module for Autonomous Monitoring System has been developed as a part of Autonomous Monitoring System that uses an IP camera attached to a small airship to monitor its surroundings. Parts of this module can be attached to the airship in order to transmit the picture to the local computer network in which it can be further processed. A web interface has been developed in order to watch this picture and use other advanced functions of the module