Production and grinding/sharpening of cemented carbide tools

Bakalářská práce se zabývá popisem výroby rotačních nástrojů ze slinutých karbidů. Slinuté karbidy se jeví jako vhodný nástrojový materiál, který má široké možnosti použití vzhledem k houževnatosti a tvrdosti materiálu a relativně nízké ceně. Nové poznatky z výroby slinutých karbidů však i nadále zlepšují mechanické vlastnosti nástrojů. Nástroje ze slinutých karbidů jsou vyráběny na moderních 5-ti osých CNC nástrojařských bruskách umožňujících rychlou a přesnou výrobu tvarově složitých nástrojů. Moderní softwarové vybavení umožňuje jednodu-ché zadávání parametrů broušení a interakci s měřicím zařízením pro rychlé možnosti změny parametrů broušení. Všechny tyto vlastnosti jsou vhodné jak pro sériovou tak i kusovou výro-bu nástrojů.The bachelor thesis concerns the description of rotary tools made of cemented carbides. Ce-mented carbides appear as wide range tool material with reference to ductility, hardness of material and relatively low cost. New knowledge of cemented carbide manufacturing has still improved mechanical characteristics of this material. Tools made of cemented carbides are made on modern 5 axis CNC tool-making grinder machines which can be easily set with grinding parameters and interaction with measuring tools for quick parameters changeover. All of these qualities are suitable for serial and also piece tools production.

Analysis of the Work Performance of Knowledge Employees at Law Offices in Context of Multitasking

Smyslem a cílem bakalářské práce je analyzovat pracovní výkon znalostních pracovníků právních kanceláří v kontextu multitasking. Multitasking je hluboce zakořeněn v prostředí právních kanceláří, kde je považován za jeho běžnou součást. Lidé mu pak nevěnují dostatečnou pozornost, přestože si ji zaslouží. Jeho vliv na pracovní výkon je neoddiskutovatelný, už z toho důvodu by neměl být přehlížen. Významnost tohoto vlivu je zkoumána pomocí dotazníkového šetření, polostrukturovaného rozhovoru a pozorování. Na základě získaných dat jsou pak vyvozovány závěry, na něž posléze navazují doporučení, jež mají pomoci lépe se vypořádávat s multitaskingem.The purpose and goal of the bachelor thesis is to analyse the work performance of knowledge workers of law offices in the context of multitasking. Multitasking is deeply rooted in the law office environment, where utility is a common part of it. People don't pay enough attention to it, even though it deserves it. Its influence on work performance is indisputable, and for that reason alone it should not be overlooked. The significance of the influence is investigated using a questionnaire survey, semi-structured interview and observation. Based on the obtained data, conclusions are drawn and followed by recommendations to help deal with multitasking better.152 - Katedra podnikohospodářskávýborn

Atmospheric pressure plasma polymerized oxazoline-based thin films: antibacterial properties and cytocompatibility performance

Polyoxazolines are a new promising class of polymers for biomedical applications. Antibiofouling polyoxazoline coatings can suppress bacterial colonization of medical devices, which can cause infections to patients. However, the creation of oxazoline-based films using conventional methods is difficult. This study presents a new way to produce plasma polymerized oxazoline-based films with antibiofouling properties and good biocompatibility. The films were created via plasma deposition from 2-methyl-2-oxazoline vapors in nitrogen atmospheric pressure dielectric barrier discharge. Diverse film properties were achieved by increasing the substrate temperature at the deposition. The physical and chemical properties of plasma polymerized polyoxazoline films were studied by SEM, EDX, FTIR, AFM, depth-sensing indentation technique, and surface energy measurement. After tuning of the deposition parameters, films with a capacity to resist bacterial biofilm formation were achieved. Deposited films also promote cell viability.Ministry of Education, Youth and Sports of the Czech RepublicMinistry of Education, Youth & Sports - Czech Republic [LO1411]; Czech Science FoundationGrant Agency of the Czech Republic [GACR 19-15240S]; Ministry of Defence of the Czech Republi

Comparison of plasma-polymerized thin films deposited from 2-methyl-2-oxazoline and 2-ethyl-2-oxazoline: I film properties

Poly(2-oxazoline) is a promising new class of polymeric materials due to their antibiofouling properties and good biocompatibility. Poly(2-oxazoline) coatings can be deposited on different substrates via plasma polymerization, which can be more advantageous than other coating methods. The aim of this study is to deposit poly(2-oxazoline) coatings using a surface dielectric barrier discharge burning in nitrogen at atmospheric pressure using 2-methyl-2-oxazoline and 2-ethyl-2-oxazoline vapours as monomers and compare the film properties. For the comparison, the antibacterial and cytocompatibility tests were peformed according to ISO norms. The antibacterial tests showed that all the deposited films were highly active against Staphylococcus aureus and Escherichia coli bacteria. The chemical composition of the films was studied using FTIR and XPS, and the film surface’s properties were studied using AFM and surface energy measurement. The cytocompatibility tests showed good cytocompatibility of all the deposited films. However, the films deposited from 2-methyl-2-oxazoline exhibit better cytocompatibility. This difference can be explained by the different chemical compositions and surface morphologies of the films deposited from different monomers.Ministerstvo Školství, Mládeže a Tělovýchovy, MŠMT, (DKRVO RP/CPS/2022/005, RP/CPS/2022/001, RP/CPS/2022/002); Ministerstvo Obrany České Republiky, MOČRMinistry of Defence of the Czech Republi

NPAHs and OPAHs in the atmosphere of two central European cities: Seasonality, urban-to-background gradients, cancer risks and gas-to-particle partitioning

Derivatives of polycyclic aromatic hydrocarbons (PAHs) such as nitrated- and oxygenated-PAHs (NPAHs and OPAHs) could be even more toxic and harmful for the environment and humans than PAHs. We assessed the spatial and seasonal variations of NPAHs and OPAHs atmospheric levels, their cancer risks and their gas-to-particle partitioning. To this end, about 250 samples of fine particulate matter (PM2.5) and 50 gaseous samples were collected in 2017 in central Europe in the cities of Brno and Ljubljana (two traffic and two urban background sites) as well as one rural site. The average particulate concentrations were ranging from below limit of quantification to 593 pg m-3 for Σ9NPAHs and from 1.64 to 4330 pg m-3 for Σ11OPAHs, with significantly higher concentrations in winter compared to summer. In winter, the particulate levels of NPAHs and OPAHs were higher at the traffic site compared to the urban background site in Brno while the opposite was found in Ljubljana. NPAHs and OPAHs particulate levels were influenced by the meteorological parameters and co-varied with several air pollutants. The significance of secondary formation on the occurrence of some NPAHs and OPAHs is indicated. In winter, 27-47% of samples collected at all sites were above the acceptable lifetime carcinogenic risk. The gas-particle partitioning of NPAHs and OPAHs was influenced by their physico-chemical properties, the season and the site-specific aerosol composition. Three NPAHs and five OPAHs had higher particulate mass fractions at the traffic site, suggesting they could be primarily emitted as particles from vehicle traffic and subsequently partitioning to the gas phase along air transport. This study underlines the importance of inclusion of the gas phase in addition to the particulate phase when assessing the atmospheric fate of polycyclic aromatic compounds and also when assessing the related health risk.This project was supported by the European Union's H2020 Framework Programme (ICARUS project) under grant agreement No – 690105, by the Czech Science Foundation (#P503 20-07117S) and by the RECETOX (LM2018121) and ACTRIS-CZ (LM2018122) research infrastructures funded by the Czech Ministry of Education, Youth and Sports of the Czech Republic and the European Structural and Investment Funds (CZ.02.1.01/0.0/0.0/16_013/0001761 and CZ.02.1.01/0.0/0.0/16_013/0001315). Funding of the Slovenian Agency of research through a programme P1-0143 is acknowledged. H2020 ERA-PLANET (No. 689443) iGOSP project is also acknowledged.S

Antibacterial thin films deposited from propane-butane mixture in atmospheric pressure discharge

Antibacterial coatings on biomedical instruments are of great interest because they can suppress bacterial colonization on these instruments. In this study, antibacterial polymeric thin coatings were deposited on teflon substrates using atmospheric pressure plasma polymerization from a propane–butane mixture. The plasma polymerization was performed by means of surface dielectric barrier discharge burning in nitrogen at atmospheric pressure. The chemical composition of plasma polymerized propane–butane films was studied by energy-dispersive X-ray spectroscopy (EDX) and FTIR. The film surface properties were studied by SEM and by surface energy measurement. The EDX analysis showed that the films consisted of carbon, nitrogen and oxygen from ambient air. The FTIR analysis confirmed, in particular, the presence of alkyl, nitrile, acetylene, imide and amine groups. The deposited films were hydrophilic with a water contact angle in the range of 13–23°. The thin film deposited samples were highly active against both S. aureus and E. coli strains in general. On the other hand, the films were cytocompatible, reaching more than 80% of the cell viability threshold compared to reference polystyrene tissue. © 2023 by the authors.Ministerstvo Školství, Mládeže a Tělovýchovy, MŠMT: RP/CPS/2022/001, RP/CPS/2022/002; Ministerstvo Obrany České Republiky, MOČ

Atmospheric pressure plasma polymerized 2-ethyl-2-oxazoline based thin films for biomedical purposes

Polyoxazoline thin coatings were deposited on glass substrates using atmospheric pressure plasma polymerization from 2-ethyl-2-oxazoline vapours. The plasma polymerization was performed in dielectric barrier discharge burning in nitrogen at atmospheric pressure. The thin films stable in aqueous environments were obtained at the deposition with increased substrate temperature, which was changed from 20◦ C to 150◦ C. The thin film deposited samples were highly active against both S. aureus and E. coli strains in general. The chemical composition of polyoxazoline films was studied by FTIR and XPS, the mechanical properties of films were studied by depth sensing indentation technique and by scratch tests. The film surface properties were studied by AFM and by surface energy measurement. After tuning the deposition parameters (i.e., monomer flow rate and substrate temperature), stable films, which resist bacterial biofilm formation and have cell-repellent properties, were achieved. Such antibiofouling polyoxazoline thin films can have many potential biomedical applications. © MDPI AG. All rights reserved.Czech Science FoundationGrant Agency of the Czech Republic [GACR 19-15240S]; Ministry of Defence of the Czech Republi

14. mezinárodní vědecká konference Didaktická konference 2021

Title in English: 14th International Scientific Conference Didactic Conference 2021: Proceedings Didactics of mathematics, natural sciences and vocational education represent developing areas and are a breeding ground for new ideas and approaches. In mathematics and physics, the proceedings provide an overview of the historical development of education process and the possibilities of activating students. From a practical point of view, physics and chemistry are interconnected by using simulations in teaching. Vocational education is represented from various perspectives, whether in technical education, by solving logistical problems, or educational activities in the teaching of economic subjects. Due to the current situation, there are abundant contributions on the effects of the ongoing pandemic on the educational process and distance learning

Disaster Recovery plan for healthcare organisation

Hlavním tématem této práce je Disaster Recovery a Business Continuity Planning. Cílem této práce je vytvoření návrhu Disaster Recovery plánu pro konkrétní zdravotnické zařízení. Jako součást návrhu je provedena analýza nemocnice a identifikace slabých míst. Součástí analýzy je také analýza hrozeb a dopadů. Na základě toho průzkumu je následně vytvořen návrh Disaster Recovery plánu. V první části práce jsou vymezeny základní pojmy Business Continuity Managementu a postup vytvoření plánu. Jsou zde teoreticky popsány všechny kroky, které jsou nutné k implementaci tohoto plánu do podniku. V další části je provedena již zmíněná analýza nemocnice se všemi nutnými kroky k vytvoření návrhu Disaster Recovery plánu, který tvoří hlavní výstup této práce. Dílčími cíli práce je navrhnutí způsobu následné implementace Disaster Recovery plánu a konečné shrnutí dosavadní analýzy a výsledků práce.Theme of this thesis is Disaster Recovery and Business Continuity Planning. Main goal is design of Disaster Recovery plan for specific healthcare organization. One part of the design is analysis of analyzed hospital and identification of core applications and weak spots of the system. Within the analysis is risk assessment and assessment of its impact on the main applications. Based on this research the Disaster Recovery Plan is proposed. First part defines basic parts of Business Continuity Management and process of creating plans of recovery, including theoretical description of all steps necessary to implement these plans. Second part contains analysis of examined hospital with all the steps defined in previous chapters and definition of Disaster Recovery plan, which is main output of this work. Partial goal of this thesis includes proposal of implementation of Disaster Recovery plan and final assessment of analysis and its output

Daň z finančních transakcí jako možný zdroj příjmu rozpočtu Evropské unie

This Master theses examines revenue from implementing financial transaction tax in the European Union. Furthermore, it analyses partial or full replacement of current own resources with this tax