Global ETD Search

61	Využití fluxačních přísad pro úpravu vlastností asfaltových pojiv / Use of fluxing additives to modify the properties of asphalt binders Šefránková, Radka January 2020 (has links) The subject of the thesis is to describe the effect of fluxing additives on the behaviour of asphalt binders. Emphasis will be placed on changes in rheological properties of asphalt binders at intermediate temperatures, stability during aging and influence of fluxing agents on their low-temperature properties. Theoretical part will deal with the principle of asphalt binders aging and it will summarize knowledge about fluxing additives. Further, empirical and functional tests will be described in order to evaluate asphalt binders. In the practical part, all laboratory tests will be evaluated and the effects of two different fluxing additives will be compared.
62	Směrování v bezdrátových sítích / Routing in Wireless Networks Janský, Václav January 2008 (has links) This work deals with routing protocols for ad hoc wireless networks. First ad hoc networks are introduced. Routing protocols are then classified according to several criteria. Four routing protocols algorithms are described. They are proactive protocols DSDV and CGSR, reactive DSR and hybrid ZRP. Next AODV routing protocol is described in details. Advantages and disadvantages of AODV and two variants of AODV are also introduced. A new protocol is designed based on the disadvantages of the AODV protocol. This work also describes the implementation and integration of the new protocol in the ns-2 simulator. Results of the simulations are presented.
63	Control of transmission system power flows Kreikebaum, Frank Karl 13 January 2014 (has links) Power flow (PF) control can increase the utilization of the transmission system and connect lower cost generation with load. While PF controllers have demonstrated the ability to realize dynamic PF control for more than 25 years, PF control has been sparsely implemented. This research re-examines PF control in light of the recent development of fractionally-rated PF controllers and the incremental power flow (IPF) control concept. IPF control is the transfer of an incremental quantity of power from a specified source bus to specified destination bus along a specified path without influencing power flows on circuits outside of the path. The objectives of the research are to develop power system operation and planning methods compatible with IPF control, test the technical viability of IPF control, develop transmission planning frameworks leveraging PF and IPF control, develop power system operation and planning tools compatible with PF control, and quantify the impacts of PF and IPF control on multi-decade transmission planning. The results suggest that planning and operation of the power system are feasible with PF controllers and may lead to cost savings. The proposed planning frameworks may incent transmission investment and be compatible with the existing transmission planning process. If the results of the planning tool demonstration scale to the national level, the annual savings in electricity expenditures would be $13 billion per year (2010$). The proposed incremental packetized energy concept may facilitate a reduction in the environmental impact of energy consumption and lead to additional cost savings. Power flow control Transmission planning Power flow controller Controllable network transformer Distributed series reactance Fractionally-rated back-to-back Genetic algorithm Incremental power flow Merchant electrical pipeline Power purchase option Phase-shifting transformer Renewable portfolio standard Security-constrained optimal power flow Static synchronous series compensator Thyristor controlled series capacitor Optimal power flow CNT DSR CSCOPF FR-BTB GA IPF MEP PPO PSCOPF PST RPS SCOPF SSSC TCSC OPF Electric power distribution

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