National Repository of Grey Literature 50 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Temperature changes in lead-acid batteries
Grepl, Jan ; Chladil, Ladislav (referee) ; Bača, Petr (advisor)
The aim of this thesis is familiarization with the basic lead-acid batteries construction with specialization on their differences. This work is divided in theoretical part and practical part. At first, the theoretical part deals with basics of functions of electrochemical cells and their fundamental division. In the case of lead-acid batteries the work focuses on the fundamental chemical reactions and fundamental principle of their construction. Aftwerwars are also in this part included negative phenomena, which can occur during the operation of the lead-acid batteries and possibly decrease their capacity or shorten their lifetime period. In practical part takes part description of measuring station. Subsequently is realised the correction of masurement sensors. Finally there takes place an analysis of measured parameters in experimental cell in CC and CC/CV charging mode.
Optimization of magnetic separation for "point-of-need" electrochemical detection
Milivojević, Nina ; Čmiel, Vratislav (referee) ; Kudr,, Jiří (advisor)
This bachelor thesis deals with the issue of separation of antibody against adhesin A of the bacterium Helicobacter pylori (HpaA) using magnetic particles. It includes information about various methods of detection and determination of pathogens, in our case Helicobacter pylori and at the same time, contains optimization of conditions for determination of the mentioned antibodies.
The measurements of earthing systems and the role of electrical soil resistivity
Capyk, Jan ; Jurák, Viktor (referee) ; Vyčítal, Václav (advisor)
The theoretical part of the thesis is focused on explaining the concept of soil resistivity, applicable methods of its measurement, comparison of two methods used to measure the resistance of the earth electrode and a description of the measuring device Metro PU 193 used for the practical part of the thesis. In the practical part, the reader is acquainted with the results of measuring soil resistivity and earth resistance in the field, with their evaluation with respect to various influencing factors and with designs of earth conductors for high voltage poles for which soil resistivity was measured. The thesis contains plotted graphs of various dependencies according to the results of measured values and compares them with theoretical assumptions.
Evaluation of usage effectivity of myoprosthesis in individuals with inborn or aquired amputation of upper extremity
Maleš, Jan ; Daďová, Klára (advisor) ; Strnad, Pavel (referee)
Thesis title: Evaluation of effectiveness of using myoelectric prosthesis by people with congenital or acquired amputation of the upper limb Aims: The aim of my thesis is to evaluate the effectiveness of myoelectric prosthesis using by people with upper limb amputation. Find out how effectively users are able to manage individual tasks with myoprosthesis and basic ADL activities. Methodology: The research group consisted of 6 people with upper limb amputation. In this thesis, there were used three methods of data collection. The first method that was applied was a survey, which was used to obtain anamnestic data by the research group. The second method of data collection was the observation of probands during the performance of individual tasks. The third chosen method was measurement by using a special test aimed at evaluation of the effectiveness while using and the involvement of myorpothesis in the locomotor chain against a healthy upper limb. Results: Based on observations and measurements, it was performed that all probands are able to functionally and effectively involve the myoprosthesis in the locomotor chain in the performance of individual tasks. Another positive result of this thesis was the finding that all probands obtained in the test over 50% rate of effective use when comparing the...
Evaluation Of Temperature Influence on Lead-Acid Battery Properties
Langer, Martin ; Zimáková, Jana (referee) ; Bača, Petr (advisor)
This work deals with lead-acid batteries, their properties and individual types that are available on the market. The temperature dependences of the battery parameters at different ambient temperatures and at different discharging and charging modes are measured here. The theoretical part of the work deals with electrochemical cells in general, description of their main parts and principles of operation. The work analyzes the types of batteries used, their advantages and negatives. In the case of a lead-acid battery, its internal structure and the function of the electrodes and the electrolyte are taken into account. Furthermore, a description of individual possible negative phenomena that take place in lead-acid batteries and contribute to the end of their service life is included. In the practical part, 6 batteries are tested at different charging currents, which provides information about their behavior both during discharge and at the time of charging. During the experiments, testing is not only performed at room temperature, but the batteries are also exposed to high temperatures up to 75 ° C.
Workplace for measuring electrochemical potential of metals
Cápal, David ; Kazda, Tomáš (referee) ; Libich, Jiří (advisor)
This bachelor's thesis describes the issues related to corrosion in electrical engineering. Thesis describes corrosion itself, historical mentions and causes. It also deals in deatail with electrochemical corrosion and the behavior of ions at the electrode-electrolyte interface together with the redox processes that accompany them. This thesis describes the origin and use of these electrochemical reactions as a way of creating electrochemical potential in liquid electrolytes at the metal-electrolyte interface. Thesis also describes measuring methods and evaluation of measured results using polarization curves and Tafel diagrams.
Design and testing of XRD holder for post-mortem analysis of li-ion battery electrodes performed in an inert atmosphere
Klvač, Ondřej ; Chladil, Ladislav (referee) ; Čech, Ondřej (advisor)
The work describes the design and manufacturing of a test device for post-mortem measurements of electrodes of electrochemical cells using X-ray diffraction spectroscopy. The theoretical part describes the diffractometer Rigaku Miniflex 600, for which the product is intended. At the same time, an overview of solutions in various applications is processed here in the form of a recherche. The practical part documents the current development of a new cell, on which tests were performed. Here is an overview of the influence of gases and insulating materials on the resulting data, especially distortion and attenuation. Subsequently, a new design with improved hermetic insulation and sample displacement error correction is described. The principle of operation of the manufactured cell, including the control unit and software, is elaborated in the form of technical documentation. Finally, the functionality is verified by comparing the diffractograms of the powder standards and the graphite electrodes.
Research and Development of OnChip Solid Amalgam Microelectrode for the Detection of Biomacromolecules
Tkáčová, Tereza ; Drbohlavová, Jana (referee) ; Hrdý, Radim (advisor)
The aim of this thesis is utilising of amalgam electrodes in electrochemistry, especially for diagnostics of biomakromolecules and DNA. There will be designed a suitable method of amalgamation, applicated on 64-electrodes chip system in the practical part. Several substances will be tested on amalgam electrodes and then the results will be processed and evaluated.
XRD characterization of electrodes and electrode materials for electrochemical power sources
Klvač, Ondřej ; Chladil, Ladislav (referee) ; Čech, Ondřej (advisor)
The thesis describes available choices of methods for research of electrochemical power source electrode strcture by x-ray diffraction spectroscopy. At first there is a theoretical computation of difractogram. Then there are discussed possibilities of in-situ and ex-situ techniques as background research. Practical part of thesis compares theoretical assumptions to measurements of lithium and sodium cells, including analyze of crystallographic phases and lattice constants. As a conclusion, there are discussed possibilities of subsequent research.
Lead-acid battery formation
Hlaváč, Pavel ; Tošer, Pavel (referee) ; Vaculík, Sebastian (advisor)
This bachelor project deals with the pulse charging of lead-acid batteries and ways of formation of electrodes so that the new batteries can constantly offer high performance and efficiency for its life. The work is an attempt to compare and determine whether the formation of different charging modes will not have a major impact on the quality of a formed battery. The formation of the different modes uses both the pulse and continuous charging. Everything is tested on four manufactured articles. The production of positive electrode and formation of accumulator is processed in various chapters of my project at our workplace.

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