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CNC router for PCB
Gerják, Rastislav ; Vaculík, Sebastian (referee) ; Vyroubal, Petr (advisor)
In mechanical industry, both additive and subtractive manufacturing methods are controlled by instructions in G-code, making it possible to utilize both technologies in one modular device. Main objective is to design, construct, and calibrate multipurpose machine based on RepRap 3D printer, which will be able to use attached spindle to precisely mill light materials. Particular emphasis is given to ability to carve a pattern and drill holes in plated substrate in order to create functional PCB by incision.
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Modelling of lithium ion batteries using ECM
Langer, Lukáš ; Kazda, Tomáš (referee) ; Vyroubal, Petr (advisor)
The main aim of this paper are models of Li-Ion storage batteries made and simulated in ANSYS Fluent software. Various ways of simulations are discussed with main aim on ECM method and how its numerical model is computed. A process of getting information and required data from real battery to be compared with simulation results by EIS method is also discussed. These results are then compared with results from ANSYS Fluent.
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Numerical model of ultrasonic oil level sensor
Chutný, Pavel ; Bílek, Michal (referee) ; Vyroubal, Petr (advisor)
This master’s thesis verifies physical principle of ultrasound in fluids by numerical model. At first, ultrasound study is ment. In second theoretic part, diferent kind of motor oils are described. Next, equations for numerical simulation are presented. In practical part, numerical model of level sensor is examined in well-knowed fluids (water, air). Results of laboratory measurement on topic of ultrasound velocity in oil dependent on temperature are aplicated on numerical model of sensor and optimalized.
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Numerical model of Li-Ion battery temperature field by discharging
Novotný, Jakub ; Bílek, Michal (referee) ; Vyroubal, Petr (advisor)
This work is focused on lithium-ion batteries in general and their modeling capabilities in ANSYS Fluent. The various advantages and disadvantages of li-ion batteries are describes in my work. There are also described the various models and submodels offered by ANSYS Fluent. An essential part of the work is to model the real battery and compare the results between the real battery and the simulation itself. Finally, simulation of battery breakdown is performed.
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Measurement of greenhouse gas concentrations
Dohnal, Jan ; Vyroubal, Petr (referee) ; Bača, Petr (advisor)
This master thesis deals with the greenhouse effect, various gases and methods of measurement. On the greenhouse effect is viewed from its historical dating, despite changes in atmospheric composition. It contains a theoretical analysis of the individual gases. It focuses on the most harmful greenhouse gases such as water vapor, carbon dioxide, nitrous oxide, methane, ozone, chlorofluorocarbons and halons. Analysis methods for detection of gaseous substances. Part of this work is focus on the detection of nitrogen dioxide, chloro-fluorocarbon and methane. The data is processed using a ATmega’s microcontroller and then sent to an Internet server thingspeak.com. If the device proves successful, will be used as a laboratory exercise in the course Ecology in electronics.
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The role of cholesterol, its precursors and oxidative products in clinically serious conditions
Vyroubal, Pavel ; Zadák, Zdeněk (advisor) ; Matějovič, Martin (referee) ; Dítě, Petr (referee)
The role of cholesterol, its precursors and oxidative products in clinically serious conditions Objective: The aim of the study was to elucidate the role and importance of hypocholesterolemia in clinically serious conditions. It was a monocentric, prospective clinical study. Material and Methods: Two groups of patients were recruited into the study - one group consisted of patients with coronary heart disease (CHD), who underwent miniinvasive cardiosurgical operation without extracorporeal circulation (n=22) and the other group of patients, who sustained polytrauma (n=31). Fifty three patients were recruited into the study. We performed the determination of sterols (total cholesterol, HDL cholesterol, LDL cholesterol, triacylglycerols) and their precursors (β-sitosterol, campesterol, lathosterol, skvalen), interleukin IL-6, insulin, C-peptid and cortisol in the blood serum. The short version of ACTH stimulation test was performed. The oxidative burst of granulocytes was evaluated. The blood samples were taken on the day of admission, the first, the fourth and the eighth post-operative and post-traumatic day. Results: There was a significant early decline of total cholesterol (TC) and LDL cholesterol level followed by full recovery during observed period. There was a decline of cholesterol synthesis...
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HPLC evaluation of selected drugs II
Vyroubal, Petr ; Mokrý, Milan (advisor) ; Sochor, Jaroslav (referee)
HPLC evaluation of selected drugs II. THESIS Petr Vyroubal Charles University in Prague, Faculty of Pharmacy in Hradec Králové, Department of Pharmaceutical Chemistry and Drug Control In this thesis was validated method for simultaneous HPLC analysis of paracetamol and tramadol in combined tablet. As stationary phase the chromatographic column Discovery HS F5, 5 µm, 150×3 mm I.D. made by Supelco was used. Mobile phase was formed by mixture of acetonitrile : ammonium acetate solution 0.005 mol/l, acidified with acetic acid at pH 3.2 in the ratio 20:80 (v/v). A flow rate was 1.0 ml/min. Acetylsalicylic acid was used as an internal standard. The detection was performed at λ = 270 nm using an UV detector. The substances were eluted in following order: paracetamol, acetylsalicylic acid and tramadol. The method was validated for linearity (paracetamol R = 0.9996; tramadol R = 0.9998), precision (paracetamol RSD = 0.31 %; tramadol RSD = 0.70 %), accuracy (paracetamol recovery = 99.49 %; tramadol recovery = 98.90 %) and robustness.
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Model of a lighthouse with photovoltaic power
Dvořák, Adam ; Vyroubal, Petr (referee) ; Jandová, Kristýna (advisor)
The aim of this thesis is to aquire and present the knowledge about the principles of the photovoltaic effect and panels and then discuss a theoretical analysis about these two topics. Task of the second part in this project is to design a theoretical model of a lighthouse, using pieces of information about photovoltaics which were acquired from the first part. And in the end physicaly realize designed model. In order to reach the best possible level of effectivity over the whole year, correct planning of the orientation and angle of placement while taking into consideration the movement of the sun is required before positioning the photovoltac panels.
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Analysis of the fluid mixing in the circulation reactor
Mačák, Martin ; Vyroubal, Petr (referee) ; Maxa, Jiří (advisor)
This work deals with an analysis of the fluid mixing in pilot plant loop reactor. Multiphase flow was simulated with calculation of velocity of flow and volume fraction of individual immiscible phases in hydrogenation reactor for aniline production. Parameters of flow were reviewed in individual parts of the device. Separate attention was paid to heat transfer through wall of the device with usage of external cooling. Designed model is applicable for optimalization and design of bubble loop reactors.
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