LOGISTIC CONCEPT FOR VIRTUAL ORGANISATIONS

V předložené disertační práci jsou řešeny hlavní problematické oblasti související s postavením logistiky v prostředí virtuální organizace. Teorie virtuálních organizací byla doplněna o definici virtuality a rámcový model. Dvě základní míry virtuální organizace jsou použity pro konstrukci 2x2 matice centralizace – integrace, která poskytuje jasnou klasifikaci virtuálních organizací. Dualita hierarchického rozměru účastnické struktury a vrstev virtuálního rozměru vedla k popisu funkční struktury virtuální společnosti pomocí 3x3 matice vrstev virtuální společnosti a hierarchie řízení. V tomto paradigmatu jsou interpretovány i procesy změn ve virtuální organizaci, životní cyklus virtuální organizace. Je pojednána dynamika a stabilita virtuální organizace. Je provedena interpretace logistické koncepce ve virtuální organizaci, konzistentní s prezentovanou teorií virtuální organizace. Dynamický výklad logistické koncepce je podán v podobě návrhu metodiky tvorby logistických koncepcí pro virtuální organizace. Použití a možnosti teorie byly ukázány na příkladu metodiky implementace RFID technologie ve virtuálních společnostech s přihlédnutím k přínosům a nákladům zavádění této technologie.The thesis addresses the role of logistic concept in a virtual organization. Theory of virtual organization was complemented by a definition of virtuality and a model of virtual organization was created. Two measurable properties of virtual organizations are used for construction of a 2x2 matrix of centralization – integration giving thus clear view of virtual organizations taxonomy. Duality of hierarchic dimension of network structure and layers of the virtual dimension led to a comprehensive description of virtual enterprises with the aid of newly created 3x3 matrix of virtual layer – hierarchy level. Within this framework are interpreted processes in virtual organization during virtual enterprise’s lifecycle. Dynamic restructuring and stability issues are explained with the aid of the matrixes. A consistent approach of presented virtual organization’s theory gives interpretation of emerging logistic concept. The use and application potential of presented theory is exemplified in development of RFID implementation method for virtual organizations. Attention is paid to RFID costs and benefits analysis under condition of virtual organizing.

Paraloid B72 nanodispersion preparation technology and its possibilities for use in the monument care

The paper summarizes the results of laboratory research on acrylate polymer Paraloid B72, the use of which is widespread in the consolidation and protection of historical materials. The aim of laboratory research was primarily to analyze the possibilities of modifying particle sizes, given that this material characteristic plays an important role in the penetration process and hence the effectiveness of the consolidator. The contribution shows and compares the basic properties of the tested dispersions of Paraloid B72. The tested polymer system has a smaller particle size and it is possible to assume the possibility of proper use in monument care.NAKI [DG16P02M055

Thickness dependent structural ordering, degradation and metastability in polysilane thin films: A photoluminescence study on representative σ-conjugated polymers

We present a fundamental experimental study based on the fluorescence investigation of thin σ-conjugated polymer films, where the dependence of optoelectrical properties and UV degradation on film thickness ranging from nano- to microscale was studied. Such extensive and detailed study was performed for the first time and observed spectral shifts in emission and excitation spectra and UV degradation retardation point towards the conclusions that there exists a threshold thickness where the material degradation behavior, electron delocalization and structure suddenly change. The development of well aligned polymeric chain structure between the nano- and micrometer thickness (on the mesoscale) was shown responsible for the manifested phenomena. The material thicker than critical 500 nm has extremely small Stokes' shift, maximum extended σ-delocalization along the silicon polymer backbone and exhibits remarkable UV degradation slowdown and self-recovery ability. On the contrary, the electronic properties of thin films below 80 nm resemble those of random coils in solutions. The films of moderate thickness show relatively steep transition between these two modes of structural ordering and resulting properties. Altogether, we consider this complex phenomenon as a consequence of the mesoscale effect, which is an only recently introduced concept in polymer thin films. © 2015 Elsevier B.V. All rights reserved.Operational Programme 'Research and Development for Innovations'; European Regional Development Fund (ERDF); National Budget of the Czech Republic within the project 'Centre of Polymer Systems' [CZ.1.05/2.1.00/03.0111]; Operational Programme 'Education for Competitiveness'; European Social Fund (ESF); National Budget of the Czech Republic, within the project 'Advanced Theoretical and Experimental Studies of Polymer Systems' [CZ.1.07/23.00/20.0104]; Ministry of Education, Youth and Sports of the Czech Republic - Program NPU I [LO1504

Microwave-assisted hydrothermal synthesis of Ag/ZnO sub-microparticles

A fast and environmentally friendly, microwave-assisted, hydrothermal synthesis was utilized for the preparation of a Ag/ZnO hybrid system by using zinc acetate dihydrate and silver nitrate as the sources of ZU(2+) and Ag+, and hexamethylentetramine as the reducing and precipitating agent. The influence of the concentration was investigated by X-ray diffraction analysis, scanning electron microscopy and energy-dispersive analysis. It was found that the concentration has a strong effect on the morphology and proportion between the Ag and ZnO components of the prepared particulate materials. With a decreasing concentration, the morphology of the ZnO changed from twinned or single frustums to rod-like microparticles, whereas the silver morphology changed from large polygon-shaped microparticles to very small, spherical nanoparticles.internal grant of TBU in Zlin [IGA/FT/2013/014]; European Regional Development Fund (ERDF); national budget of the Czech Republic, within the Centre of Polymer Systems project [CZ.1.05/2.1.00/03.0111]; European Social Fund (ESF); national budget of the Czech Republic, within the "Advanced Theoretical and Experimental Studies of Polymer Systems" project [CZ.1.07/2.3.00/20.0104

Technology of preparation of barium and magnesium hydroxide nanodispersion and possibilities of their use in monument care

An application of hydroxide nanoparticles in preservation of cultural heritage attracted great interest. The nanodispersions of calcium, magnesium or barium hydroxides exhibit high performance in consolidation abilities. In this work we focused on preparation of magnesium and barium hydroxide nanoparticles. For the synthetic procedure we used acetate precursors and sodium hydroxide. Obtained particles were dispersed in 2-propanol. Hydroxide nanoparticles were characterized by powder X-Ray diffraction, infrared spectroscopy and scanning electron microscopy. It was observed that smaller particles were achieved in case of magnesium hydroxide. Presented work demonstrates that this reaction procedure can be applied for preparation of materials used in cultural heritage preservation.NAKI research project "Development and Research of Materials, Methods and Technologies for the Restoration, Preservation and Strengthening of Historic Masonry Constructions and Surfaces and Systems of Preventive Conservation of Cultural Heritage Buildings [DG16P02M055

Poly(vinyl alcohol): formulation of a polymer ink for the patterning of substrates with a drop-on-demand inkjet printer

Nowadays, inkjet-printing technology is considered one of the most promising deposition techniques. It allows the highly precise deposition of functional materials to the required place on a substrate and a cost-saving printing process, especially when the drop-on-demand manner is used. Moreover, it represents the perfect technique for the controlled deposition of polymer material, especially for polymer solutions, because of their low viscosity and better process ability. Poly(vinyl alcohol) was chosen because of its versatile application potential; moreover, its compatibility with the human body only increases its usability in bio-applications. The main purpose of this research was to find the appropriate solvent system for poly(vinyl alcohol) and its printability. Solutions with the best properties were printed in pre-defined patterns and personally defined motifs and the printing conditions were optimized in order to obtain patterns with the best possible shape and resolution, which were analysed by optical microscopy.Ministry of Education; Youth and Sports of the Czech Republic - Program NPU I [LO1504]; Internal Grant Agency of Tomas Bata University in Zlin [IGA/CPS/2015/006

Preparation and Characterization of a Bioartificial Polymeric Material: Bilayer of Cellulose Acetate-PVA

A new bioartificial polymeric material consisting of a bilayer of cellulose acetate and poly(vinyl alcohol) was successfully obtained by casting method. The material was characterized by Fourier transform infrared spectroscopy, contact angle, scanning electron microscopy, differential scanning calorimetry, gas permeability, water vapor permeability, and mechanical properties. The characterization indicates that two distinct and well-differentiated surfaces were achieved without detriment to the bulk properties. The interaction between natural and synthetic polymers indeed enhanced the gas permeability as well as the water vapor permeability in comparison to the original components, although mechanical properties were not substantially boosted by the combination of both. Moreover, beyond the interface, there were no detected interactions between the polymers as can be evidenced by the presence of a unique T-g in the bilayer. The amalgamation of the relatively good mechanical properties with the two differentiated surfaces and the improvement of the permeability properties could indicate the potential of the material for being used in medicine.Ministry of Education, Youth and Sports of the Czech Republic-Program NPU I [LO1504

The effect of zinc oxide filler on mechano-physical and electromechanical properties of PVDF

This study deals with the effect of star-like zinc oxide (ZnO) filler addition into poly(vinylidene fluoride) (PVDF) matrix on its structural and physical properties with the consequences to mechanical energy harvesting performance. In this case, the microwave-assisted synthesis was optimized for the preparation of unique star-like shape of ZnO particles. Their crystallinity and star-like morphology/elemental composition were analyzed using XRD and SEM/EDX spectroscopy, respectively. The investigation of α-crystalline phase transformation into β-crystalline phase of neat PVDF matrix, and upon introducing various ZnO concentrations was performed using FTIR spectroscopy. Finally, the mechanical energy harvesting capability measurements showed that the addition of star-like ZnO filler enhanced the d33 electro-mechanical coupling coefficient more than two times when compared to neat PVDF matrix. © NANOCON 2019.All right reserved.Czech Science FoundationGrant Agency of the Czech Republic [19-17457S]; Ministry of Education, Youth and Sports of the Czech Republic - program NPU I [LO1504

Magnetorheology of core-shell carbonyl iron/ZnO rod-like particle silicone oil suspensions under oscillatory shear

The aim of this study is a preparation and application of inorganic coating on the surface of carbonyl iron particles. The two step solvothermal synthesis provides core-shell CI/ZnO rod-like morphology. Compact coating of particles has a slightly negative impact on their magnetic properties (measured for magnetic field strength in the range from 0 to 213 mT); however, there is a suitable magnetorheological performance investigated under oscillatory shear, suitable to be applied in real applications. © Published under licence by IOP Publishing Ltd

Photolitography on flexible substrates

Nowadays preparation of structures on flexible substrates is highly demanded because of using this patterns in field of flexible electronics. This contribution deals with photolitographic procces for preparation of structures on flexible substrates. The method of photolitography enables to create designed patterns in various material (e.g. metals as conductive layers) on various substrates (silicon wafers, foils, etc.). First the designed pattern is exposed through the mask by UV light into polymer resist, then the pattern is transfered into metal layer by wet etching through the developed windows in resist. In this paper several patterns are prepared through the positive resist PMMA by photolitography into various metal layer (Cu, Al) on flexible substrates. © 2018 TANGER Ltd. All Rights Reserved.Ministry of Education, Youth and Sports of the Czech Republic - program NPU I [LO1504]; Operational Program Research and Development for Innovations - European Regional Development Fund (ERDF); national budget of the Czech Republic [CZ.1.05/2.1.00/19.0409