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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Revolution counter of high-speed motors
 Biječek, Vilém ; Tomíček, Pavel (referee) ; Skácel, Josef (advisor)
This bachelor thesis deals with two issues. Several methods have been explored to measure rotational speed. Primarily the speed of the high-speed shafts. Based on this, it was found that the most suitable method for this experiment is the optical method. The second focus of this work was design and development of the device. A large part is devoted to the selection and application of components, and simulations of circuit connections, which have been successfully tested and implemented. The output is an accurately measured value shown on the display. It also included the design of printed circuit boards, one for analogue information processing and the other for placing the microcontroller with the display.
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Portable liquid chromatograph and analyses of hazardous substances
 Šesták, Jozef ; Gogaľová, Zuzana ; Kahle, Vladislav ; Lunerová, K.
Progress in technology of microchips, batteries and LEDs in the last two decades enable development of portable instruments which can satisfy the requirements of modern liquid chromatography (LC). Application of portable LC is advantageous if simple and rapid sample treatment procedure followed by a short HPLC run can be executed in the point of sampling. Our research group have developed a concept of portable HPLC based on simple hydraulic scheme and a unique optical detector for simultaneous detection of absorbance and fluorescence of compounds eluted off microcolumn. Considering in-field analysis of hazardous substances, this instrument can be advantageous for analysis of compounds which are difficult to detect and quantify by other contemporary portable instruments utilizing different working principles due to incompatibility with their physico-chemical properties (e. g. microbial toxins).
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