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Stable magnetorheological fluids containing bidisperse fillers with compact/mesoporous silica coatings
Get PDFA drawback of magnetorheological fluids is low kinetic stability, which severely limits their practical utilization. This paper describes the suppression of sedimentation through a combination of bidispersal and coating techniques. A magnetic, sub-micro additive was fabricated and sequentially coated with organosilanes. The first layer was represented by compact silica, while the outer layer consisted of mesoporous silica, obtained with the oil-water biphase stratification method. The success of the modification technique was evidenced with transmission electron microscopy, scanning electron microscopy/energy-dispersive X-ray spectroscopy and Fourier-transform infrared spectroscopy. The coating exceptionally increased the specific surface area, from 47 m(2)/g (neat particles) up to 312 m(2)/g, which when combined with lower density, resulted in remarkable improvement in the sedimentation profile. At this expense, the compact/mesoporous silica slightly diminished the magnetization of the particles, while the magnetorheological performance remained at an acceptable level, as evaluated with a modified version of the Cross model. Sedimentation curves were, for the first time in magnetorheology, modelled via a novel five-parameter equation (S-model) that showed a robust fitting capability. The sub-micro additive prevented the primary carbonyl iron particles from aggregation, which was projected into the improved sedimentation behavior (up to a six-fold reduction in the sedimentation rate). Detailed focus was also given to analyze the implications of the sub-micro additives and their surface texture on the overall behavior of the bidisperse magnetorheological fluids.Ministry of Education, Youth and Sports of the Czech Republic [RP/CPS/2022/007, LM2018124
Nomen Proprium und Metonymie. Peter Kochs kognitive Metonymie-Analyse und ihre Grenzen
Get PDFWhen language change phenomena have repercussions in various social areas at the same time, they are worth an analysis. One of the well documented occurrences of this kind is the discursive history of the metonymic proper name Bologna as a designation of an education reform. As Johannes Angermüller und Ronny Scholz stated in their remarkable study (2013), its mere introduction had made some political processes easier. In this paper the question is put whether some distinctions of the notable metonymy theory by Peter Koch (2004) are able to deliver categories to clarify this phenomenon. In doing so, I point out some deficiencies of Kochs approach concerning his conception of metonymy as such and demonstrate that these are to be ascribed to its "cognitive"frame and that the remedy lies implicitly in an elementary consideration by Saussure and in an explicit passage by Husserl whom Koch himself invokes. As a result of this, I come to the conclusion that Saussure and, particularly, Husserl could have elucidated the most crucial feature of the metonymic proper name more appropriately. © 2021 Walter de Gruyter GmbH, Berlin/Boston
A review of prestressed fibre-reinforced polymer matrix composites
Get PDFThis review examines various studies on reducing tensile stresses generated in a polymer matrix composite without increasing the mass or dimension of the material. The sources of residual stresses and their impacts on the developed composite were identified, and the different techniques used in limiting residual stresses were also discussed. Furthermore, the review elaborates on fibre-prestressing techniques based on elastically (EPPMC) and viscoelastically (VPPMC) prestressed polymer matrix composites, while advantages and limitations associated with EPPMC and VPPMC methods are also explained. The report shows that tensile residual stresses are induced in a polymer matrix composite during production as a result of unequal expansion, moisture absorption and chemical shrinkage; their manifestations have detrimental effects on the mechanical properties of the polymer composite. Both EPPMC and VPPMC have great influence in reducing residual stresses in the polymer matrix and thereby improving the mechanical properties of composite materials. The reports from this study provide some basis for selecting a suitable technique for prestressing as well as measuring residual stresses in composite materials. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.CZ.02.1.01/0.0/0.0/17_049/0008407, IGA/FT/ 2021/006, IGA/FT/2022/007; European Commission, ECTBU in Zlin [IGA/FT/2022/007]; Structural Funds of the European Union project [CZ.02.1.01/0.0/0.0/17_049/0008407
The perception of the market and operational area of business by service sector and tourism companies in terms of CSR implementation
Get PDFOur research examined the attitudes of owners and managers of small and medium-sized enterprises in the V4 countries, who behave responsibly - they use corporate social responsibility in their managerial practice on issues focused on the market and operational area of business. The paper is based on a questionnaire survey with data collection from September 2019 to January 2020. Statistical methods of Pearson's chi-square and z-score were used to assess the hypotheses. The results proved that there are significant differences in companies in services and tourism in the context of implementing the CSR concept. Entrepreneurs who implement social responsibility with a significant positive difference agree that a company places great emphasis on the innovation of its products and services. Researchers found that the sector has an impact on the perception of decreasing customers' requests on specific products/services. We found that corporate social responsibility and its implementation in corporate practice positively affects the relationship of V4's small and medium enterprises in the services and tourism sector to service production innovation issues, which helps increase business performance and decline customer complaints. © 2021 Center for International Scientific Research of VSO and VSPP. All Rights Reserved.Univerzita Tomáše Bati ve Zlíně: IGA/FaME/2021/005Tomas Bata University in Zlin [IGA/FaME/2021/005
Antibody conjugated PLGA nanocarriers and superparmagnetic nanoparticles for targeted delivery of oxaliplatin to cells from colorectal carcinoma
Get PDFAnti-CD133 monoclonal antibody (Ab)-conjugated poly(lactide-co-glycolide) (PLGA) nanocarriers, for the targeted delivery of oxaliplatin (OXA) and superparamagnetic nanoparticles (IO-OA) to colorectal cancer cells (CaCo-2), were designed, synthesized, characterized, and evaluated in this study. The co-encapsulation of OXA and IO-OA was achieved in two types of polymeric carriers, namely, PLGA and poly(lactide-co-glycolide)-poly(ethylene glycol) (PLGA-PEG) by double emulsion. PLGA_IO-OA_OXA and PEGylated PLGA_IO-OA_OXA nanoparticles displayed a comparable mean diameter of 207 ± 70 nm and 185 ± 119 nm, respectively. The concentration of the released OXA from the PEGylated PLGA_IO-OA_OXA increased very rapidly, reaching ~100% release after only 2 h, while the PLGA_IO-OA_OXA displayed a slower and sustained drug release. Therefore, for a controlled OXA release, non-PEGylated PLGA nanoparticles were more convenient. Interestingly, preservation of the superparamagnetic behavior of the IO-OA, without magnetic hysteresis all along the dissolution process, was observed. The non-PEGylated nanoparticles (PLGA_OXA, PLGA_IO-OA_OXA) were selected for the anti-CD133 Ab conjugation. The affinity of Ab-coated nanoparticles for CD133-positive cells was examined using fluorescence microscopy in CaCo-2 cells, which was followed by a viability assay. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.Grantová Agentura České Republiky, GA ČR: 19-02889S, A2_FCHI_2021_01
Means for reducing adverse effects of transport
No full textThe impact of transport on the human environment has long been a current global issue and the urgency of its active solution will continue to increase. The negative effects that transport, in general, brings with it problems that threaten economic stability, mobility, and living standards. Therefore, the states jointly participate in the creation of measures leading to the mitigation of the negative effects of individual modes of transport. Restricting traffic without negative consequences in other areas is not realistic. Therefore, research priorities are shifting to more environmentally friendly modes of transport and focusing on alternative fuels. This article will analyze current modes of transport and their adverse effects on the human environment. The introduction of the article will describe the various modes of transport and specific adverse effects. Their occurrence will be evaluated and compared, the system of emission allowances and their impact will be marginally analyzed. At the end of the article, an analysis of the future development of individual modes of transport will be performed and the current possibilities of mitigating their adverse effects will be summarized. The final discussion will be devoted to new evolving technologies, their benefits, and possible risks. Means for reducing adverse effects of transport. © 2021 Kaunas University of Technology. All rights reserved
Linking employer branding and firm-level performance: The case of Azerbaijani firms registered on Glassdoor
Get PDFIn today's competitive labor market, firms use employer branding strategies to engage their workforce for better performance. However, the current understanding of the role of employer branding in firm-level performance in the context of developing countries is very limited. This study aims to investigate the importance of employee retention and recruitment efficiency to strengthen the relationship between employer branding and firm-level performance. Data are collected from 316 Azerbaijani firms that are tagged by the Glassdoor and reviewed by former employees. Structural equation modeling is used to test the hypotheses. The results of the study show that employer branding can enhance firm-level performance through employee retention and recruitment efficiency. However, online employee reviews on the Glassdoor do not moderate the connection between employer branding and employee retention. Current employees feel motivated to continue working with those companies which show excellent employer strategies. Furthermore, a firm's strategy to attract the best employee pool improves firm-level performance. It is also concluded that employees working in developing countries do not concern about online reviews on their employer, and prefer to continue working despite contrary thoughts. © Aydan Huseynova, Jana Matošková, Aleš Gregar, 2022IGA/FaME/2019/008; Univerzita Tomáše Bati ve Zlín
Teaching degree students' experience of teaching practice
Get PDFThe study is focussed on perception of teaching practices by pre-service teachers in preschool and primary education university programmes. Further, the study analysed the reality shock that occurred in these students during teaching practice. The sample consisted of 41 students in preschool education programmes, while 54 students followed the primary-level education programme. The data collection methods were student portfolios and student diaries from teaching practice. In the portfolios it was possible to analyse the activities, opinions, attitudes and products of student practice. Diaries reported students' feelings and everyday experience in the schools. Qualitative content analysis was used to analyse the data. Two significant findings were obtained, i.e., supervising teachers' frequent unprofessional behaviour towards student teachers, and the somatic and emotional exhaustion of students
Blesková povodeň v Sobotišti v roku 1672 vo vedomostiach M. Bela a ďalších písomných prameňoch
No full textThe paper deals with the reconstruction of climatic and hydrological aspects of the flash flood in Sobotište in 1678 in terms of historical geography. The weather conditions and consequences (especially damage) caused by this natural disaster were outlined by M. Bel in paragraph IX. CHVOYNITZE (slov. Chvojnica), § V. Natural History of the General Part of the Knowledge of the Nitra County (1742). More detailed information about the given flood is provided by transcripts of anabaptist codes by J. Beck (1883), family historiography by D. Krman jr. (1708) and monograph and paper written by Ľ. Pauliny (1888, 1891). We obtained further data and parallels to the issue from the literature, data from the Slovak Hydrometeorological Institute and old maps. © 2022 Revista Ecuatoriana de Neurologia. All rights reserved
The threat of social engineering and the safety of companies
Get PDFSocial engineering is a method of attack aimed at the state, organization, or individual. It focuses on the weakest point in the use of information and communication technologies, specifically the human factor. The article deals with the issue of social engineering with a focus on the attack and the possibilities of defense against it in a commercial and manufacturing company. Several questionnaire studies were conducted, which found that only a small number of staff had been trained in the past against similar attacks. Companies still underestimate their protection, investing in new technologies, but already investing less in training employees who use them. At the same time, social engineering largely focuses on them. The article, therefore, identifies social engineering, its ways of carrying out the attack. Furthermore, the article briefly summarizes its threats as well as its history, along with an overview of the first attacks. For greater orientation in practice, the individual types of attackers, the progress of their attacks, and the relevant technical aspects are described here. An analysis of the current state of safety in the existing manufacturing and trading company was performed, namely, the specific directives that are currently in force. These were compared with current needs and appropriate measures were proposed. Based on this analysis, recommendations for improving the state of security against social engineering attacks in all companies, in general, are described at the end of the article. The most frequently used methods in practice are listed according to the survey, followed by the establishment of safety recommendations. Individual technologies are constantly evolving, newer applications are being launched on the market, and at the same time, more advanced methods for data protection need to be developed.Univerzita Tomáše Bati ve Zlíně: IGA/FAI/2021/002Internal Grant Agency of Tomas Bata University in Zlin; Institute of Safety Engineering, Faculty of Applied Informatics; [IGA/FAI/2021/002