National Repository of Grey Literature 127 records found  beginprevious21 - 30nextend  jump to record: Search took 0.00 seconds. 
Wireless weather station
Hrabovský, Michal ; Marcoň, Petr (referee) ; Szabó, Zoltán (advisor)
This bachelor thesis focuses on a plan of a wireless meteostation composed of internal and external unit. Meteostation is supplied by a battery and photovoltaic panel It measures temperature, humidity, pressure, precipitation, speed and direction of wind. Measured data are sent to the internet through wi-fi connection. Internal unit measures temperature and humidity. With the aid of wi-fi connection the internal unit loas data from the internet and then the data show up on display. Measured data can be shown on phone. At the beginning of theoretical part, meteorology will be analysed. Afterwards, this work describes physical principles and the method of measurement of physical quantities which are measured by the meteostation, Internet of Things and cloud services. The second part focuses on the description of meteostation plans. Then it describes hardware and software that was used in the mrtestation. Finally, it describes the schrmr of the device. Third part focuses on construction of the device, 3D printing of its parts.
Electric probe measurements in the anode area of a DC arc plasma torch at low pressure
Ondáč, Peter ; Mašláni, Alan ; Hrabovský, Milan
We measured radial profiles of the electric field, plasma electrical potential and electron temperature in the hot anode area of a hybrid water-argon DC arc plasma torch with an external anode. The measurements were made under different values of the ambient pressure, during the restrike mode with a constricted anode arc attachment or during a supersonic mode with a diffuse anode arc attachment. The results provide first experimental data on plasma electrical potential in that anode area.
Measuring of Mean Plasma Electrical Conductivity in Anode Area of Plasma Torches with an External Anode
Ondáč, Peter ; Mašláni, Alan ; Hrabovský, Milan
We developed a non-intrusive direct procedure of measuring an average electrical conductivity of a plasma volume in hot anode areas of those plasma torches. For our measurements, we used a high-speed camera, a high-voltage probe, and a hybrid water–argon plasma torch. The measurements were made for various values of ambient pressure, arc electric current, and argon flow rate. The measured plasma conductivity is in agreement with a model, camera observations and indirectly also with spectroscopy measurements. The procedure provides missing experimental data on the average plasma electrical conductivity and estimates average plasma temperature in the anode areas. The procedure can be theoretically used in every plasma torch where the anode arc attachment movement can be observed during a restrike process\n
Application of Electric Probes for Study of Structure of Thermal Plasma Jet.
Hurba, Oleksiy ; Hrabovský, Milan
Thermal plasma at atmospheric pressure was investigated. Electric probes and doable probe used as relatively simple and efficient tool for diagnostic of structure of flow field in thermal plasma jet. Were defined plasma potential and boundaries of the conducting region and their changing for the diferent operating modes of plasma torch.
Alternative Methods for the Analysis of Structural Changes in Muscle Tissue
Kaspar, Pavel ; Hrabovský, Miroslav (referee) ; Adam, Vojtěch (referee) ; Grmela, Lubomír (advisor)
Tato disertační práce se zabývá tématikou analýzy strukturálních změn ve svalové tkáni a metodikou optického měření. I přesto, že existuje nezanedbatelné množství metod pro detekci konkrétních změn ve svalovině, především pak v konzumním mase, drtivá většina z nich se zaměřuje na jeden konkrétní proces a vyžaduje komplikované postupy a drahé přístroje. Předmětem prezentovaného výzkumu není tedy nalézt metody přesnější a specifičtější, než jsou ty již exitující, ale raději zvolit alternativní přístup k problematice. Součástí je pak i snaha najít možnosti jak obejít technologické nároky moderních postupů a přitom se přiblížit co nejvíce jejich informačnímu přínosu. Za tímto účelem je potřeba mít dostatečné teoretické znalosti a experimentální zkušenosti především v oboru fyziky, optiky a postupů měření, ale také široké povědomí o problematice biologických tkání a procesů v nich probíhajících. Na základě získaných informací a pochopení pochodů ve svalové tkáni jsou navrhnuty a testovány tři rozdílné přístupy. Vytvořené metody pracují s fotony v transmisním i reflexním uspořádání. Pomocí pozorování změn absorpce, rozptylu a polarizace světla po interakci se vzorkem svalové tkáně jsou posouzeny jeho další optické vlastnosti především index lomu a optická anizotropie. Identifikace změn optických vlastností vzorků za různých podmínek umožňuje společně se simulací Monte Carlo posoudit rozdíly mezi vzorky čerstvými, starými, sušenými a jednou či dvakrát zmraženými a rozmraženými.
Shape Memory Alloys - Modelling of Non-linear Systems with Hysteresis
Vašina, Michal ; Hrabovský, Miroslav (referee) ; Grepl, Robert (referee) ; Žalud, Luděk (advisor)
This work describes a possibility to use a shape memory alloy as a non-traditional actuator in a particular mechatronic system. The practical part of this work is dedicated to the experimental property verification of the chosen shape memory alloy and also to the design and realization of the new type of electrically controlled gabled valve that uses a shape memory alloy as an actuator. This valve is designed as a replacement of the traditional solution and is also integrated into McKibbens pneumatic muscle endcap. There are also results of practical functional verification of the designed gabled valve solution listed here, and the limited condition for its manufacturing and use is stated here. In the theoretical part of this work, firstly, the shape memory alloy and non-linear systems hysteresis type are discussed. Secondly a new particular solution is designed, which is based on a non-linear computational element, defined by goniometric cosine function. Finally, the properties of the designed solution are verified through the simulations and with the use of experimentally gained datas.
Enthalpy Probe Diagnostics of Steam/Argon Plasma Jet
Hlína, Michal ; Hrabovský, Milan
DC plasma torch with argon/water stabilization features extreme properties of the exiting plasma jet. The plasma mass flow rate is very low while the temperature reaches very high values. Plasma properties were measured by enthalpy probe connected to a mass spectrometer. The measurements of enthalpy, temperature, density and dynamic pressure were carried out for three different arc currents and at atmospheric pressure. The dependences of plasma characteristics on arc current were shown.

National Repository of Grey Literature : 127 records found   beginprevious21 - 30nextend  jump to record:
See also: similar author names
1 Hrabovský, Martin
2 Hrabovský, Matúš
6 Hrabovský, Michal
15 Hrabovský, Milan
5 Hrabovský, Miloš
7 Hrabovský, Miroslav
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