Browsing by Author "Urbánek, Michal"
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- ItemLaser-induced fragmentation of carbonyl iron as a clean method to enhance magnetorheological effect(Elsevier Ltd, 2020-05-01) Cvek, Martin; Torres-Mendieta, Rafael; Havelka, Ondřej; Urbánek, Michal; Plachý, Tomáš; Černík, MiroslavMagnetic nanoparticles (NPs) are widely used as additives in magnetorheological (MR) suspensions to enhance their magnetic performance and kinetic stability. The synthesis of NPs is often resolved via chemical routes or complex manufacturing procedures, which require hazardous chemicals and generate waste products. In this study, a clean, laser-mediated strategy known as laser fragmentation in liquids (LFL) is proposed that enables the synthesis of NP-based additives directly from the given MR suspension, with the added advantage of limiting the production of waste during the fabrication process. The carbonyl iron (CI) microparticles dispersed in ethylene glycol were used as both the MR suspension and precursor agent in the production of the nanoscale additive. The size and crystalline structure of the NPs were investigated via TEM and XRD, respectively. The mixture of the MR suspension and laser-synthesized additive notably facilitated the magnetisation of the CI particles, incrementing the MR characteristics and dynamic yield stress values by up to 31% in a low-to-moderate field region, which are important aspects in various field-controlled robotic, damping and torque systems. The concept presented appears to be an effective and clean alternative for fabricating bidispersed MR suspensions through the nanoscale additive approach.
- ItemVýznam konvergenčních kritérií při rozšiřování eurozóny(Technická Univerzita v Liberci, 2010) Urbánek, Michal; Bednářová, PavlaThe seminal aim of this thesis is to put an emphasis on the convergence kriteria in the member states of the euroarea within the progress of the last several years. Furthermore, the convergence criteria of all euroarea member states are going to be analysed in this paper. The only state excluded from this paper is Slovakia, admitting the euroarea only at the very beginning of 2009. Because of a very short Slovakian membership in the eurozone there is no point in including it into this research. As the fulfilment of these criteria poses the fundamental assumption towards successful euroarea admission, some evident advantages as well as disadvantages stemming from the existence of these criteria have not been omitted. The Czech republic admission into this area is also going to be linked with the fulfilment of these criteria. In spite of the infinite date of the Czech republic?s admission has not yet been stated, it is obliged to enter this area and to fulfil the criteria. By and large, when judging our pre-accession readiness up to now and with respect to some convergence values nowadays (public deficit specifically), it is not supposed to be a very optimistic prospect for the Czech republic in the nearest future.
- ItemVýznam konvergenčních kritérií při rozšiřování eurozónyUrbánek, Michal
- ItemZkoumání přístupů studentů na univerzitě Huddersfield k nakupování učebnic přes internet(Technická Univerzita v Liberci, 2008) Urbánek, Michal; Dědková, JaroslavaTextbooks are very important tool of study material. However, a lot of researches showed the purchases of textbooks in bookstores have been declining not only in the UK. With the evolution of World Wide Web textbooks are also available through the Internet. Nevertheless, no research in the UK has been carried out so far to find out if online retailers could be the reason of declining interest in purchasing textbooks by typical retailers. The aim of this paper was therefore to investigate how online retailers are attractive in term of purchasing textbooks. Research was aimed to students at the University of Huddersfield at Higher Education. Students were addressed by means of questionnaire which was sent to their university email.