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Measurement of nanoparticles in 3D printing using FFF/FDM technology
Klouda, Karel ; Kubátová, Hana ; Nechvátal, Marek ; Bátrlová, Kateřina ; Roupcová, Petra
For additive manufacturing, where the material is prepared by depositing thin layers, the simplified term 3D printing is used. This process releases volatile organic compounds and ultrafine particles into the air. A number of measurements have been published on this topic for a given type of printer with a specific type of thermoplastic. The procedure for the measurement of nanoparticle concentrations (10-700 nm) and their mean diameters can be called "field" because it was carried out in a real environment with mass deployment of FFF/FDM 3D printing, with the measuring equipment moving between printers in different areas and activities: in the production of parts to be assembled in the printers; in the production of components for shields during the lockout associated with the covid-19 pandemic; in the creative workshops and laboratories of Průsa Research. The aim of these measurements in real situations was to find measures to reduce the concentration of nanoparticles. The evaluation of the results was carried out in accordance with ISO/TR 27 628 and provided for the design of technological and organisational measures to reduce the concentrations.
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Infuse of specialization on structure cities, rural habitat and landscape
Štěpánek, Martin ; Urbášková, Hana (referee) ; Suchánek, Radek (referee) ; Kopáčik, Gabriel (advisor)
Specialization and concentration of human activity is a phenomenon which accompanies the development of human settlements from their very beginning. While thoroughly explored in other fields, interconnection between pecialisation, on one hand, and urbanism and architecture, on the other, has been neglected. Nevertheless, this issue is of high ignificance since it determines the settlement structure development to a large extent. If understood correctly, this underlying principle of the impact of specialisation and concentration on the settlement development offers a new insight into historical context and enables one to understand the present development.
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Ionic fields of various kinds and method of measurement.
Gubani, Ondřej ; Vaněk, Jiří (referee) ; Vognar, Jiří (advisor)
In the air there are positively and negatively charged ions with different mobility and size. The therapeutic effect of negative ions with high mobility is known. High concentration of negative ions occurs in speleotherapic caves. This bachelor thesis introduces the methods of measuring the concentration and mobility of various kinds of ions and their evaluation by spectral characteristics. It verifies the current mirror effect on the ions´ concentration in space. It also examines the effect of different types of ions in living organisms and an appropriate area treatment for the occurrence of negative ions.
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Assesment of air concentration in water depending on pressure
Uttendorfský, Petr ; Himr, Daniel (referee) ; Pochylý, František (advisor)
This bachelor thesis deals with air concentration in the water. The general conception comes from Henry's law about gas dissolved in the liquids depending on pressure. The basic derivation, the values which influence dissolvability and the Henry's Law constant´s forms are discussed here. Next part is about the usage aeration in the industry and in the construction of aeration systems. The special equipment is for realization experiment. This special equipment is gas´s accumulator based. The measured values are expressed as the tables and the graphs. The data from experiment validated the force of Henry´s Law: with growing pressure above water level, the air concentration in the water is growing too.
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Untitled
Tomanová, Anna ; Hrončeková, Ivana (referee) ; Ambrůz, Jan (advisor)
Action focused on an experiment with human physical and psychological balance. Presented work is an experiment based on a week I spent non-stop alone in abandoned factory six meters above the floor balancing on a girder.
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Automatic Processing of DCE-MRI Data
Karela, Jiří ; Mézl, Martin (referee) ; Jiřík, Radovan (advisor)
This master thesis deals with the issue of automatic processing of DCE-MRI data. It describes some important procedures and methods. The work is divided into theoretical part, practical part and conclusion. The theoretical part mainly describes some methods, on the basis of which the practical part was then solved. However, another theory related to the topic is also described here. The practical part then builds on the theory and solves the problem of automatic detection of arterial voxels and the concentration of contrast agent in the arteries. The algorithms are tested on rat brain data obtained from DCE-MRI. The conclusion serves as a summary and evaluation of our results. It also serves as a reflection on the implementation of our methods.
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Modelling of the ultrasound intensity in contrast imaging
Lacko, Jiří ; Jiřík, Radovan (referee) ; Kolář, Radim (advisor)
There are several mathematical compartment models developed in this thesis. Their purpose is to compute the concentration of ultrasonographic contrast agents in different compartments (simple two-compartment model, compartment model of liver and chain of N compartments). Based on these concentraitions the change of image brightness is set and the indicator dilution Curve is computed. Each of models is influenced by bolus of contrast agents, blood flow and decay of injected contrast agents.
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Micropollutants in water resources and ways of their elimination
Lukášová, Daniela ; Látal,, Milan (referee) ; Biela, Renata (advisor)
The diploma thesis deals with micro-fuels in drinking water sources and their subsequent removal. In the thesis mainly pesticides and pharmaceuticals are described. The reader is first introduced to the most common pesticides occurring in water and their consumption. Drugs are described in a similar context. In addition, there are practical studies on the occurrence, degradation and removal of micro-pollutants from water. The final thesis is a laboratory experiment dealing with the removal of salicylic acid from water by filtration through the filtration material Bayoxide E33 and activated carbon. The thesis describes the procedure and results of the experiment.
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Tracking Air Pollutants by Using Wireless Sensor Network
Válek, Tomáš ; Šimek, Václav (referee) ; Tříska, Vít (advisor)
This thesis discusses design and production of a prototype of a device and implementation of a firmware for this device. Its function is to wirelessly monitor a concentration of pollutants like carbon monoxide and propane-butane in an atmosphere. Motivation is to allow parking of vehicles with engine gaseous fuels in underground collective garages for public use according to ČSN 73 6058 standard. The prototype of the device has been designed so that it could be used not only in collective garages but also in garages of family houses. The device was successfully designed, produced and programmed so that it can be deployed in real-world conditions.
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