National Repository of Grey Literature 55 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Excitation Energy Transfer in Photosynthetic Reaction Centres
Ptáček, Michal ; Mančal, Tomáš (advisor) ; Dostál, Jakub (referee)
The photosynthetic reaction centres have uppermost importance in photosynthesis. They represent the actual place where the energy carried by photons is turned into charge-separated states which then enable to establish the electrochemical H+ transmembrane gradient used by ATP synthases. The photosynthetic light- harvesting complexes gather the energy of light radiation and direct it in the form of electronic excitation energy into the reaction centres. The efficiency of this process is exceptionally high, close to unity, what is capturing the interest of researchers for decades. The development of experimental techniques has led to better understanding of this process down to atomic scale. Nowadays, this insight along with the theoretical basis stemming from quantum mechanics can be used to perform accurate computer simulations which can determine properties of the whole molecular aggregates independently of experiments. This thesis provides an introduction into the field of theoretical photosynthesis research, and it summarises the progress made in past two decades. The detailed theoretical approaches are being put into perspective of the reaction centres of photosynthetic purple bacterium Rhodobacter sphaeroides which is a valuable model organism. Both experimental and theoretical results of...
Crisis scenario model of a large power outage
Bláha, Michal ; Radil, Lukáš (referee) ; Ptáček, Michal (advisor)
The bachelor´s thesis describes legislation addressing the issue of power outages. The issue of blackout is explained here, along with the general effects on society. The work goes on to describe the most historically important blackouts in the world and the states of emergency that occurred in the Czech Republic. In the next part, a fictionalcity is created to demonstrate the consequences of blackout. Furthermore, the work describes how the city would deal with such a resulting blackout. In the end, a recommendation is proposed for a fictional city that would make the city more resistant to further blackout.
Potential of non-frequency ancillary services for a distribution system operator
Reiskup, Filip ; Holub, Martin (referee) ; Ptáček, Michal (advisor)
This thesis provides a basic overview of the ancillary services in a transmission system. It summarizes changes regarding the implementation of European directives SOGL and EBGL. It describes in detail a portfolio of non-frequency ancillary services used in the distribution systems. It evaluates the demand of E.ON distribution system potential for those services in particular locations. Practical part is focused on a potential of reactive power management in this distribution area. It evaluates reactive power flow into transmission system and indicates the most critical substations. This thesis also covers analysis of existing resources in this distribution area and assign their possible potential in reactive power management.
Technical proposal of distribution system using 22 kV instead of 35 kV
Kopunec, Kristián ; Matouš, Milan (referee) ; Ptáček, Michal (advisor)
The diploma thesis deals with the design of the connection of the Svratecko area with the distribution network of the company E.ON Distribuce, a.s.. The theoretical part describes the energy legislation and the individual standards on which the thesis is based. It also describes the concept of a 22 kV high voltage network. The practical part of the thesis is focused on the creation of line models in the program E-vlivy, which will supply the Svratecko area and the model of the monitored area. Outputs from the thesis will be used by E.ON Distribuce, a.s. to evaluate the connection of the Svratecko area.
Technical design of extensive replacement of overhead lines by HV cables in given distribution area
Bracek, David ; Kolacia, Tomáš (referee) ; Ptáček, Michal (advisor)
This diploma thesis deals with the technical design of extensive replacement of overhead lines by high voltage cables in the given distribution area. In its first part the thesis is focused on the survey of the concerning legislation and technical standards, which must be followed during making technical design documentation. It also mentions the processes which precede the replacement itself. There are also the operational differences between the overhead lines and the high voltage cables in the first part, too. The second part is focused on the technical description of the given area, the technical design of the replacement by high voltage cables and the realization of calculation, which is important as a base for further realization of technical arrangements. The consideration of technical feasibility and economic efficiency are also contained in the second part.
Design and implementation of the soil resistivity measurement system
Dirbák, Štefan ; Ptáček, Michal (referee) ; Vrána, Michal (advisor)
This diploma thesis deals with research and study of soil impedance measurement and soil resistivity. Currently, the issue of measuring and determining soil resistance is ensured through the gradual measurement of certain soil parameters at individual points of the surface (or depth of the ground). This thesis focuses on the idea of measuring soil resistance on a certain area using a network of electrodes through a suitably designed test, measurement and evaluation system. Such an approach may find application in the need to determine soil parameters (such as resistivity) on a specific demarcated area (or depth). The prospect of such an application can be seen in saving time, energy and money needed to measure the soil resistivity of a certain area (as opposed to gradual point measurements). The configuration possibilities of OMICRON CPC 100 measuring instrument were used for the design and implementation of the measuring system for the mentioned purpose. The work is completed by verification of the proposed solution by real measurement with evaluation of the results.
Analysis of the impacts of DS element failures on reliability indicators
Vachutka, Ondřej ; Hanuš, Radek (referee) ; Ptáček, Michal (advisor)
Bachelor's thesis deals with the impacts of distribution network element failures on reliability indicators. Therefore it makes basic description of the reliability, the reliability indicators or the regulation of continuity in distribution of electric power. It also presents main results of the identification and evaluation of individual 22 kV elements failures in distribution network of PREdistribuce, a. s. between 2011 to 2016.
Potential Production of Electric Energy by Photovoltaic Power Stations on the Roof Installation in Municipality up to 3000 Residents
Štefek, Martin ; Ptáček, Michal (referee) ; Paar, Martin (advisor)
The aim of this bachelor thesis is to determine the maximum technical potential of photovoltaic roof power stations of the municipality with up to 3,000 inhabitants. The thesis proposes its own procedure enabling a quick determination of the maximum size of the installation for each house based on the ČSN EN 15316-4-3 standard. The proposed methodology is applied on the municipality Moravany u Brna. For overall estimation of the photovoltaic potential of the municipality, other methodologies using only statistical data are applied and compared with proposed methodology. Last section of the thesis deals with the estimation of the load caused by a large number of small photovoltaic roof installations.
Reactive power changes at the TSO-DSO interconnection point by RES power factor regulation
Pololáník, Pavel ; Fiala, Zbyněk (referee) ; Ptáček, Michal (advisor)
This bachelor thesis deals with the long-term development of active, and primarily reactive energy flow at 110/22 kV distribution transformation points in the E. ON distribution network. It compares two different areas (city vs. countryside), differing in type of used distribution network and in composition of decentralized energy resources. Another point of this thesis is to describe current controlling possibilities for decentralized resources installed to the voltage level of 22 kV considering reactive power compensation. Thesis introduces proposed methods and conditions used in remote mass controlling of power factor of decentralized resources. There is mentioned an evaluation of an already performed test whose purpose was to verify possibility of influencing reactive power at the interconnection point between distribution and transmission system. The factors causing the overflow reactive power were analysed. In this thesis were analysed factors, which causing overflow reactive power from distribution to the transmission system. This analysis will be the basis for future use of mass reactive power regulation.
Design of LV distribution network reconstruction within the long-term network development strategies
Navrátil, Stanislav ; Wasserbauer, Vojtěch (referee) ; Ptáček, Michal (advisor)
The aim of this thesis is to design a low voltage distribution grid. The thesis includes theoretical knowledge related to this topic. Great emphasis is placed on development strategies in the area of low voltage distribution networks. A practical part of the thesis is focused on analysis of the real low voltage distribution grid followed by designing reconstruction solution. This solution is based on technical standards ČSN, PNE and procedures used in ČEZ Distribuce, a.s. company. For this purpose computing software DAISY Bizon Projektant will be used.

National Repository of Grey Literature : 55 records found   1 - 10nextend  jump to record:
See also: similar author names
1 Ptáček, M.
11 Ptáček, Martin
1 Ptáček, Matouš
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