Tomas Bata University in Zlín
Institutional repository of Tomas Bata University LibraryNot a member yet
10673 research outputs found
Sort by
Modeling of extrusion film casting process for battery separator membranes production using variable heat transfer coefficient
No full textThe main objective of this work is to investigate the advantages of using a variable versus constant heat transfer coefficient and its effects on the development of the temperature and crystallinity during the extrusion film casting operation under fast cooling conditions suitable for the production of advanced battery separators. For this purpose, a viscoelastic extrusion film casting model accounting for thermal effects, with newly adopted generalized heat transfer coefficient approach accounting for convection and radiation, including temperature and flow-induced crystallization was used, and the model predictions were compared with relevant experimental data. The results obtained indicate that the use of a variable HTC approach combined with flow-induced crystallization should be preferred, otherwise the model predictions do not capture the experimental data for film temperature and crystallinity. It is believed that the proposed model can bring a more detailed insight into the optimization of such manufacturing applications.Grantová Agentura České Republiky, GA ČR, (21–09174S)Grant Agency of the Czech Republic [21-09174S
Conductivity of carbonized and activated leather waste
No full textThe conductivity of chromium-tanned pigskin leather waste carbonized in various manner to nitrogen-containing carbons is reported. Four protocols have been tested: (1) The simple carbonization at 800 °C in inert atmosphere, (2) the carbonization at 500 °C followed by the activation with potassium hydroxide at 800 °C, (3) direct activation with the alkali at 800 °C and (4) the similar activation with potassium hydroxide excess. The fibrous collagen morphology was preserved after the carbonization except for some shrinkage. The yield in the simple carbonization, 26.9 wt%, was reduced to 23.9 wt% for the activated products. Elemental analysis indicated reduced content of organic elements after carbonization, and X-ray fluorescence the composition of growing inorganic part. The chromium content in biochar was close to 12 wt% and the X-ray diffraction revealed also the presence of metallic chromium in addition to expected chromium(III) oxide and sulfide. FTIR and Raman spectroscopies demonstrated the typical pattern of carbonized materials. The specific surface area and pore volume increased after the activation. The resistivity of the powdered carbonized leather was determined in four-point van der Pauw setup. It decreased by more than one order of magnitude as applied pressure increased from 0.1 to 10 MPa. The sample conductivity depended only a little on the way of carbonization and was of the order of tenths to units S cm−1 at 10 MPa. The precarbonization followed by the activation provided the best result with respect to the yield, nitrogen-content, specific surface area and conductivity of the carbonized material.Ministerstvo Školství, Mládeže a Tělovýchovy, MŠMT, (FRC/RO 70200003025/2102, LM2023056)Ministry of Education, Youth and Sports of the Czech Republic [LM2023056]; [FRC/RO 70200003025/2102
Holistic perspective of globally accepted research on social-media marketing on SME perspective
No full textThe use and adoption of social media marketing as the latest networking platforms by businesses and small and medium-sized enterprises is worldwide and provides SMEs with unique opportunities to perform research that have an impact. The paper discusses academic literature on factors driving the adoption of social media marketing by SMEs and companies. The paper helps to take a holistic perspective of the present state of global acceptance research into social media marketing. It also provides a valuable way to evaluate the form of work to be carried out in social media marketing to advance more analysis. © 8th European Conference on Social Media, ECSM 2021.IGA/FaME/2021/006, IGA/FaME/2021/008; Tomas Bata University in Zlin, TB
Rethinking group dynamics in public organizations: Starting point for behavioral public strategy research
Get PDFPurpose: The paper aims to explore group dynamics in the management and administration of the selected public organization. Specific interest is given to two fundamental domains of group dynamics: 1) communication processes and interaction patterns; 2) group cohesion and climate. Methods: The approach is based on in-depth interviews with public employees representing various departments of a public organization. A total of 34 subjects participated in this study and provided primary data for coding and finding patterns. Both investigator and data triangulation are used to conceptualize group dynamics in the public organization. Results: Public organizations' employees face hardships in knowledge sharing and tend to misunderstand the agenda between various departments and citizens. The participation of citizens in decision making could be seen as a 'double edged sword' that contributes to the implementation of public projects, but often derails efficient organizational processes. Public organizations struggle with employee turnover, insufficient treatment of employee wellbeing, and unwillingness to pursue personal development. Conclusion: Understanding and further defining the level of group dynamics among public employees is the first step towards adopting innovation approaches. The paper highlights the implications for public organizations with an overview of the behaviors needed for a smooth strategy process in development planning based on organizational forces that leads to a better understanding of group dynamics.project of the Internal Grant Agency of Tomas Bata University in Zlin [RO/2022/07
Analyzing the effectiveness of the gaussian mixture model clustering algorithm in software enhancement effort estimation
No full textBackground: The influence of data clustering on the effort estimating process has been studied extensively. Studies focus on partitioning and density-based clustering, and some use hierarchical clustering, but most focus on software development effort estimation.
Aim: We focus on the Gaussian Mixture Model algorithm's effectiveness in the software enhancement effort estimation. Method: We used the Gaussian Mixture Model clustering algorithm to cluster the dataset into clusters and then applied the IFPUG FPA method for effort estimation on these clusters. The ISBSG dataset was used in this study. The number of clusters is determined using the Elbow method with the Distortion score. Besides, the k-means algorithm was also used as the comparative algorithm. The baseline model was determined by using the FPA method on the entire dataset without clustering. Result: With the number of clusters selected as 4, on six evaluation criteria, MAE, MAPE, RMSE, MBRE, and MIBRE, the experimental results show the estimated accuracy using the FPA method on clustered data significantly better when compared with no clustering. Conclusion: the software enhancement effort estimation can be significantly improved when using the Gaussian Mixture Model clustering algorithm.IGA/CebiaTech/2022/001, RVO/FAI/2021/002Faculty of Applied Informatics, Tomas Bata University in Zlin [IGA/CebiaTech/2022/001, RVO/FAI/2021/002
The determinants of loyalty to ecotourism against the background of consumer satisfaction
No full textThe desire to gain knowledge about the cultural identity and nature of unexplored places has been inherent in humans since time immemorial. However, the emergence of motivation to care, preserve and increase the cultural, historical, natural and recreational values of destinations indicates a higher level of consciousness and responsibility of tourists. The commitment of tourists to this kind of travel is caused not only by marketing prerequisites, but also by socio-psychological factors different: responsibility, psychological ownership. Due to international competition, the relevance of improving the tourist image is increasing, for which it is necessary to develop the concept of socially and environmentally responsible tourism, develop useful behavioral attitudes in society, which increases the role of transfer of cultural and natural knowledge, consolidation of tourists and local residents in improving the tourist image. The study considers the construct of loyalty to a particular destination. The aim of the study is to deepen the analysis of socio-psychological factors of loyalty to ecotourism and develop a methodology for their study. On the basis of correlational, empirical and sociological methods the direct correlation between loyalty and responsibility, satisfaction, positive experience, psychological property and image of the destination was substantiated. It is proved that research activity, intellectual preparation, motivation, respect for nature, cultural involvement and involvement of local residents have a positive effect on the level of responsibility. Cultural involvement and protection of nature, psychological attachment and social interaction increase the sense of psychological ownership, in contrast to the massiveness factor of the place, which decreases it. © 2022, ASERS Publishing House. All rights reserved.IGA/FaME/2022/01
High-speed videomicroscopy of sheared carbonyl iron suspensions
Get PDFThe postyield rheological regime is investigated in sheared magnetic field-responsive composites (i.e. carbonyl iron based magnetorheological fluids). When subjected to uniaxial DC fields, high-speed videomicroscopy techniques and dedicated image analysis tools demonstrate that dispersed magnetic microparticles self-assemble to form concentric layered patterns above a particular shear rate ( γ ˙ R ,c ). This critical shear rate for layer formation is dictated by a critical Mason number M n c ∼ 1 that is associated to the destruction of the last doublet in the chain-like aggregates. The number of layers, mean width, percentage of occupation and mean period are found to be very weakly dependent on the shear rate in start-up shearing flow tests. Experimental data for the mean period are in good agreement with an energy minimization theory.101030666, RP/CPS/2022/007; Ministerstvo Školství, Mládeže a Tělovýchovy, MŠMT; Federación Española de Enfermedades Raras, FEDER; Ministerio de Ciencia e Innovación, MICINN: AE EQC2019-005529-P, PID2019-104883GB-I00, TED2021-129384B-C22; European Regional Development Fund, ERDF; Junta de Andalucía: A-FQM-396-UGR20, P18-FR-2465ERDF; FEDER; MICINN [AE EQC2019-005529-P, PID2019-104883GB-I00, TED2021-129384B-C22]; Junta de Andalucia [P18-FR-2465, A-FQM-396-UGR20]; (EFST)-H2020-MSCA-IF-2020 fellowship [101030666]; MEYS of the Czech Republic [RP/CPS/2022/007
Exact two-component TDDFT with simple two-electron picture-change corrections: X-ray absorption spectra near L- and M-edges of four-component quality at two-component cost
Get PDFX-ray absorption spectroscopy (XAS) has gained popularity in recent years as it probes matter with high spatial and elemental sensitivities. However, the theoretical modeling of XAS is a challenging task since XAS spectra feature a fine structure due to scalar (SC) and spin-orbit (SO) relativistic effects, in particular near L and M absorption edges. While full four-component (4c) calculations of XAS are nowadays feasible, there is still interest in developing approximate relativistic methods that enable XAS calculations at the two-component (2c) level while maintaining the accuracy of the parent 4c approach. In this article we present theoretical and numerical insights into two simple yet accurate 2c approaches based on an (extended) atomic mean-field exact two-component Hamiltonian framework, (e)amfX2C, for the calculation of XAS using linear eigenvalue and damped response time-dependent density functional theory (TDDFT). In contrast to the commonly used one-electron X2C (1eX2C) Hamiltonian, both amfX2C and eamfX2C account for the SC and SO two-electron and exchange-correlation picture-change (PC) effects that arise from the X2C transformation. As we demonstrate on L- and M-edge XAS spectra of transition metal and actinide compounds, the absence of PC corrections in the 1eX2C approximation results in a substantial overestimation of SO splittings, whereas (e)amfX2C Hamiltonians reproduce all essential spectral features such as shape, position, and SO splitting of the 4c references in excellent agreement, while offering significant computational savings. Therefore, the (e)amfX2C PC correction models presented here constitute reliable relativistic 2c quantum-chemical approaches for modeling XAS. © 2023 The Authors. Published by American Chemical Society.2/0135/21; NN4654K; Ministerstvo Školství, Mládeže a Tělovýchovy, MŠMT: RP/CPS/2022/007; Agentúra na Podporu Výskumu a Vývoja, APVV: APVV-19-0516, APVV-21-0497; Norges Forskningsråd: 262695, 314814, 315822; Horizon 2020: 945478, SASPRO
Deficit of digital orientation among service-based firms in an emerging economy: a resource-based view
Get PDFDigital technologies are essential tools that Service-based firms can integrate into their business to transform their operations. However, in the emerging countries' perspective, research on the application of digital orientation among Service-based firms is less researched. This poses questions to scholars why the adoption of digital orientation is quite low among developing economies. The purpose of this article is to examine the impediments to digital orientation among Service-based firms in emerging and developing countries. Inspired by a resource-based view, a survey using a structured questionnaire was administered to 466 respondents (management and employees) of Service-based firms via a convenience sampling method in Ghana. Findings revealed that the knowledge gap, cost burden, and upgrading of technology positively and significantly create the gap in digital orientation among Service-based firms. The authors admonished that Service-based firms should 'be orient' on the use of digital technologies through appropriate training programs to enhance its adoption. The study again recommends practitioners of Service-based firms cultivate the habit of investing in human and technical capacities to optimize the benefits of the evolution of digital technologies. Limitations and future research directions are discussed.Tomas Bata University in Zlin [IGA/FaME/2021/005]Tomas Bata University in Zlin, TBU: IGA/FaME/2021/00
Impact of the COVID-19 crisis on service enterprises and their attitudes towards marketing investments
Get PDFThe service sector has become the dominant sphere of market economies over the last forty years. The maturity of a country's economy is directly related to the maturity of services as an economic sector. The immense growth across the service sector has also put mounting pressure on the competitiveness of service enterprises and their marketing activities. The turn of the millennium has already seen the competitive struggle affected by two crises - first, an economic one and now, one caused by the Covid-19 pandemic, which has had a great impact (not only) on the service sector. The article deals with the question of how Czech service enterprises reflect on the impact of the pandemic. The article's aim is to find out how service enterprises perceive the impact of the Covid-19 crisis depending on their size and classification within the service sector and how they approach marketing investments during a pandemic crisis. The research is focused on service enterprises (n=90) in terms of their application of marketing processes in the conditions of the Czech Republic in the period 2020-2021. The results, based on descriptive and inferential statistics (ANOVA test in conjunction with Hochberg and Games-Howell tests, Pearson's correlation coefficient and chi-squared test), show that smaller enterprises tend to be more affected by the effects of government measures in the context of the Covid-19 crisis than medium and large enterprises.[RVO/FMK/2020/001]; [RVO/FMK/2021/001]Universiti Malaysia Kelantan, UM