Tomas Bata University in Zlín
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Evaluation of the effect of machining technologies on the surface texture analysis of Ertacetal C polymer
Get PDFThe surface created by machining significantly affects the service life and functional reliability of the component. As part of this study, four different chip machining technologies were evaluated on the surface texture of the polymer material Ertacetal C. The samples were processed by turning, milling, grinding and polishing technologies, 5 samples for each technology. Within the given technology, different cutting conditions were chosen to compare the effect of cutting conditions on the resulting surface roughness. The machined surfaces were comprehensively evaluated on the basis of 16 profile and surface roughness parameters due to the practical use of the tested material. Surface texture measurements were performed on a Talysurf CCI Lite device. A non-contact method using a coherence correlation interferometer was used for the measurement. The obtained data were evaluated using TalyMap Platinum software. Graphical documentation of the machined surfaces was made using an Olympus DSX500 optodigital metallographic microscope.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
The external factors leading to product innovation outcomes in the Visegrad Group - structural equation model approach
Get PDFThis paper empirically investigates the role of external factors which drives small and medium enterprises product innovation in the Visegrad Group. An empirical analysis is based on the Business Environment and Enterprise Performance Survey conducted by the World bank with a combined sample of 2002 small and medium enterprises (SMEs) in the Czech Republic, Slovakia, Poland, and Hungary. The results of the Structural Equation Model indicate that product innovation performance is slightly higher among SMEs that are proactive in strengthening their relationships with innovative suppliers, users, and consumers. Furthermore, the findings of this paper support the view that SMEs will have better new product development results if they improve their relationships with foreign-owned firms and collaborate with external research firms. Again, the empirical study will give insights into the SME's product innovation outcomes in the Visegrad Group and a wake-up call to SME's practitioners and stakeholders on the need to collaborate externally across the European regions. © The authors, 2021. All Rights Reserved.IGA / FaME / 2021 / 006-Development; Tomas Bata University in Zlin, TBU: IGA/FaME/2021/00
Discovering an orphan source of ionizing radiation with respect to occupational safety and health
Get PDFCompliance with the principles of occupational safety and health is one of the preconditions for avoiding emergency events. Without a doubt, this is one of the underlying duties of every employer or operator of waste recycling centers. The risk to health resulting from an orphan source of ionizing radiation in the form of scrap metal is quite high and can affect a significant number of people. As part of the precautions relating to employees, the employer must analyze the risks associated with working with scrap metal and emphasize the possibility of any previous contamination. In practice, various methods and procedures are used to assess the risks at scrap metal collection facilities, which are mostly based on the knowledge and experience of their inspectors. However, this is not usually done by means of appropriate risk analysis methods, which is the main disadvantage. The goal of this article is to point at the risks related to discovering an orphan source of ionizing radiation by using the Ishikawa diagram and the point method. Furthermore, this article also deals with the demarcation of a safety zone with respect to the protection of health and the environment. The specification of risks, the proposal of recommended precautions, and the expeditious demarcation of a safety zone in the case of the intervention of fire brigades in order to protect and/or decontaminate the persons are also included.Technology Agency of the Czech Republic, TACR: VI04000080; Univerzita Tomáše Bati ve Zlíně: LQ =OtQ 59
Airport defense systems against drones attacks
No full textCurrently, unmanned aerial vehicles (UAV) are used in a wide range of different industries. Their initial use belongs to military purposes, but with the passage of time, their versatility found its way among civilian users as well. The sharp increase in demand and supply of UAV systems on the market has led to the fact that acquisition costs are already relatively low today. Also, the control, which can be highly automated, allows for easy piloting. At the same time, however, it appears that the use of UAVs must be significantly limited by legislation in the future in order to prevent their misuse and endangering safety. As the present shows, with the help of UAVs, threats to soft targets by criminals and terrorists can be achieved relatively easily. European airports have been attacked by drones several times and forced to close. The biggest incident in terms of damage and restrictions is clearly the attack on 19-21 December 2018 at one of the largest airports in Europe, London-Gatwick, when all air traffic was disrupted and flights were canceled and delayed. The article discusses the dangers that drones can cause, and includes the categories of drones and their history. Above all, however, the article deals with the systems that aim to eliminate this threat, the most significant airport attacks are mentioned here, followed by the defense systems that were then installed with a description of their methods of detection and destruction. The article concludes that the approach of individual airports to modern anti-drone defense is not the same and follows a set of possible combinations that have proven successful. © 2022 IEEE.Univerzita Tomáše Bati ve Zlíně: IGA / FAI / 2022/00
Mathematical modeling of flow washing of preserved rawhides
No full textThis paper presents a mathematical model of flow washing with the initial volume of the washing bath of preserved raw hides by salt. The main result of this work is the determination of the concentration field of the preservative in the raw material depending on the washing time and the size of the washing water flow, based on the correct laboratory-determined diffusion coefficient of the preservative using a tortuous factor. The paper points out the usefulness of applying theoretical tools of chemical engineering in areas such as the tanning industry. © 2022 IEEE.Tomas Bata University in Zlin, TBU: CZ.02.2.69/0.0/0.0/16_028/0006243; Ministerstvo Školství, Mládeže a Tělovýchovy, MŠM
Analysis of polygraph procedure and data
No full textThe main aim of this article is to show how physiodetection is used in practice. It is focused on polygraph technology and examination process with suggestions to improvements for more accurate testing. Simultaneously, the polygraph measured tracings are discussed and the analysis of polygraph data is presented. © 2022 IEEE.CZ.02.2.69/0.0/0.0/16_018/0002381, IGA/FAI/2022/00
Investment inefficiency in the hospitality industry: The role of economic policy uncertainty
No full textCorporate investment inefficiency in the hospitality industry is an understudied topic. In this paper, we examine the effect of Economic Policy Uncertainty (EPU) on the investment inefficiency of a sample of 213 hospitality firms in the U.S. for the period 2010-2019. The results reveal that a rise in economic policy uncertainty leads to an increase in firm-level investment inefficiency in the hospitality industry. The underinvestment and the overinvestment problems are exacerbated by uncertainty. The results are robust for different variables specification and econometric techniques. Policy implications are also provided.Ministerio de Ciencia e Innovación, MICINN: PID2020-114797GB-I00Spanish Public Funds through the Ministry of Science and Innovation [PID2020-114797GB-I00
Method of device diagnostics, operating status logging and configuration changes
No full textThe aim of this research is to design a suitable design for a diagnostic device that will periodically monitor and record selected quantities in the device. The diagnostic equipment must be as flexible as possible, as the design will be applicable to all output electronic equipment of this project. This means that the diagnostic design can be applied to all control units, add-on modules or turnstile controllers. Each checked element contains different quantities that are valid for correct diagnostics. Therefore, there is a desire for a uniform design that can be customized based on the device. The data itself should include the exact time and date the measurement occurred. This information should be kept for several years for back diagnosis. Furthermore, the data should be stored primarily on the device with the possibility to transfer it to the PC via the given interface. Baseline states should be available directly on the device for immediate status. This information will be displayed via a small integrated display directly on the PCB. The data itself should be stored on a medium that retains the information even when the power supply is interrupted. The diagnostic part itself should be equipped with a backup battery, which will be functional even after the failure of the primary power supply for possible failure diagnosis. The design should consist of a microcomputer that will record events that can be updated with firmware to accommodate the board's needs. A simple program that visualizes the data for easier diagnostics will be needed to view the recorded data more easily. © 2019, Danube Adria Association for Automation and Manufacturing, DAAAM. All rights reserved.IGA / FAI / 2019/003, IGA/Cebia Tech/2019/00
The remote monitoring and controlling real systems via the GSM network GPRS/EDGE data transfer
No full textThe goal of this work was to design and realize a remote real system monitoring and controlling with the help of a mobile phone in the client/server structure. The client segment running in a GSM mobile phone was realized in the Java Micro Edition environment. Internet data transfer is supported by GPRS/EDGE service and TCP/IP protocol. The server segment was created in Java Standard Edition. A simple desktop application controlled via the system concerned is a part of the server segment running on a PC
Modelling and control of chemical batch reaktor
No full textThe paper presents a chemical batch reactor control mechanism design. A program for a computer simulation using a mathematical model of the real reactor was created. An experimental based data were filled to the program to trace the real process state variables dependencies. Different process control approaches were simulated and the results were discussed. The components dosage influence and the risks related to the process were also discussed