National Repository of Grey Literature 52 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Negotiating municipalities-industrial factory wastewater treatment coalition project: an economic laboratory experiment
Šauer, Petr ; Kolínský, Ondřej ; Prášek, Jan
It is often the case that municipalities and industrial plants treat their wastewater separately bringing the municipalities wastewater to be treated at the industrial wastewater treatment plant and reused by the plant creates potential for social costs saving for both the municipalities and the private firm. In an economic laboratory experiment we demonstrate that such voluntary agreement could be achieved even despite the presence of information asymmetry. This follows our previous research on win-win voluntary agreements and the role of information asymmetry. The biggest challenge remaining to be addressed is the distribution of the extra cake, which in our results is mostly seized by the private firm.
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Private subject in wastewater treatment regional coalition project: the case of chemical industry factory
Prášek, Jan ; Šauer, Petr
This paper presents a case study covering the solution to treatment of municipal wastewater originating from small villages located close to each other in a protected landscape area. A high environmental efficiency of treatment is required. Two scenarios of the technical solution are compared. In the first scenario, separate wastewater treatment plants will be built and operated in each of the villages. In the second one, sewerage networks will be built in each village and wastewater will be collected and treated in a wastewater treatment plant of a chemical factory located down the stream; the factory is planning to reconstruct and modernise its wastewater treatment plant. Analyses have shown that the second scenario is environmentally beneficial – ensuring high water quality in watercourses in the protected area, using purified water for industrial purposes primarily, and replenish the water balance and flows in dry periods. The second scenario also appears to be beneficial from a socio-economic point of view. Cost savings, appearing mostly at the side of the factory, creates space for negotiation and an agreement between these entities. The factory image will also improve if implementing the second scenario.
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Optimization of deep reactive ion etching process
Houška, David ; Hrdý, Radim (referee) ; Prášek, Jan (advisor)
This bachelor thesis deals with optimization of cryogenic and Bosch deep reactive ion etching (DRIE) processes. The thesis describes characterization of silicon etching methods, the principle of DRIE and the influence of individual parameters on the resulting etch profile. Based on the analysis of fabricated samples using scanning electron microscopy (SEM), both processes were optimized to create narrow microstructures with diameters ranging from 1 to 16 µm with the highest achieved depth-to-width ratio of 28:1 on a silicon substrate. Furthermore, surface roughness was analyzed using atomic force microscopy (AFM) and the presence of fluorine residues by X-ray photoelectron spectroscopy (XPS) in structures etched by both processes.
MEMS based energy harvesting
Klempa, Jaroslav ; Prášek, Jan (referee) ; Gablech, Imrich (advisor)
This work is dedicated to principles of energy harvesting or scavenging from free energy around us. Energy harvesting principles are described in the first part. Following chapter is devoted to description of piezoelectricity and piezoelectric materials. Next part researches already reported results on piezoelectric energy harvesters. Following chapter shows simulations on designed structures in ANSYS® Workbench. Next the fabrication of the structures is described. Measurement are made regarding to maximum generated power.
Comparison of properties of thin layers of titanium, nickel and silver used in semiconductor technology
Dorotík, David ; Prášek, Jan (referee) ; Hejátková, Edita (advisor)
Bachelor theses were connected with knowledge of general problems of application of thin films by methods of sputtering and evaporation. Prepare the substrate and clean it before depositing thin layers. The work was focused on the properties of these thin films in semiconductor technology.
MEMS microhotplate platform for chemical sensors
Vančík, Silvester ; Svatoš, Vojtěch (referee) ; Prášek, Jan (advisor)
This master’s thesis deals with design and fabrication of MEMS microhotplate platform for chemical gas sensors. The theoretical part describes MEMS, sensors and processes and technologies needed for fabrication of micro hotplate. The practical part includes simulations, masks and step by step microhotplate fabrication. Fabricated heating membrane was characterized and compared to theoretical values from simulations and to similar devices presented in literature.
Energy harvester working on epidermis
Fecko, Peter ; Prášek, Jan (referee) ; Hubálek, Jaromír (advisor)
This work focuses on theoretical designing of a device harvesting energy from perspiration on human epidermis. Chemical composition of the human sweat was researched from articles and publications dealing with this problem. Following their results the approximate concentration values of ionic salts (and other substances) were established, also an adequate combination of electrode metals were examined, theoretically making the energy harvester functional. Next proposal described a draft and production procedures towards manufacturing the harvester. Evaluation of voltage stability and dependency was made on changes in ionic concentrations of the electrolyte, representing human sweat. Finally, the harvester cell was produced according to proposed manufacturing methods and the cell performance was measured.
Chemorezistive gas sensor
Venkrbec, Lukáš ; Pytlíček, Zdeněk (referee) ; Prášek, Jan (advisor)
This thesis deals with the detection of gases. Based on the research, the theoretical part is devoted to the principles and construction of chemical gas sensors, especially the chemoresistive gas sensors, mainly with the active layer consisting of metal oxides and carbon nanotubes. In the second half of the theoretical part the carbon nanostructures, their properties and the methodology of preparation are reviewed. The experimental part deals with the type of support structure, preparation of the active layer and the method of its deposition and he principle of detection. In the results and discussion, the thesis focuses on the detailed processing of the results and the evaluation of the response ammonia, the impact of the modifications and procedures. In the end, the results obtained are compared, both with each other and with the relevant literature.

National Repository of Grey Literature : 52 records found   1 - 10nextend  jump to record:
See also: similar author names
4 PRÁŠEK, Jiří
2 Prášek, Jakub
4 Prášek, Jiří
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