Global ETD Search

31	Systémy zvlhčování vzduchu / Air humidification systems Cielecký, Jan January 2018 (has links) This diploma thesis deals with the use of adiabatic cooling for the improvement of microclimate of large-scale tents in Czech climatic conditions, specifically in city of Rožnov pod Radhoštěm. First part thesis is the design of a universal calculation tool for calculating the heat load of two types of large-scale tents. This tool was used to design and construct the suitable mobile trickle adiabatic cooler. The experimental part is focused on the finding of suitable material to be used to as filling of trickle adiabatic cooler and further testing it.
32	Studium chování vysokopevnostních betonů při působení vysokých teplot / Studying the behavior of high strength concrete at high temperatures Sovová, Kateřina January 2017 (has links) This master’s thesis is divided into two parts; practical and theoretical. The theoretical part of this study describes the influence of high temperature on concrete structure and chemical, mechanical and physical changes, which take place during the exposure to high temperatures. The thesis also evaluates spalling of concrete and the methods to prevent it, as well as the function of polypropylene and cellulose fibers in the concrete. The practical part deals with design, production and testing of the cement-based concrete with the use of different fibers (polypropylene fibers and cellulose fibers). The properties and the means of applications in high temperatures are also included. The practical part also assesses the influence of high temperature on strength, porosity, visual changes of specimens, changes of surface and degradation of testing specimens due to heat loads according to normative heat curve (ISO 834) and also according to hydrocarbon curve. For clearer arrangement, the experimental tests are divided into two parts and the measured values are evaluated at the end of each part. The conclusion resumes all data obtained by testing and evaluates what is the most suitable formulation. The approach for further research is also discussed.
33	Ultra-High Performance Concrete Bridge Applications in Ohio Barnard, Elné 23 May 2022 (has links) No description available. Civil Engineering Ultra-High Performance Concrete UHPC Closure placement Box beam bridge Shear key Longitudinal crack Connection Dowel bar Joint Thermal load Temperature Field test Truck load Longitudinal Joint Deck panel system UHPC joints UHPC cost ABC, UHPC construction
34	VÝZKUM A VÝVOJ KOMPOZITNÍCH MATERIÁLŮ S VYŠŠÍ REZISTENCÍ VŮČI PŮSOBENÍ VYŠŠÍCH TEPLOT / RESEARCH AND DEVELOPMENT COMPOSITE MATERIAL WITH A HIGHER RESISTANCE TO HIGH TEMPERATURES Válek, Jaroslav January 2014 (has links) Concrete has many advantageous properties as regards resistance to fire. It is non-flammable and it has a low thermal conductivity. However, concrete structures, which are not designed for resistance against fire, show significant damage after heating. In particular, the explosive flaking with the consequence of weakening the reinforced concrete cross-section and exposing the steel reinforcement to the temperatures higher than critical temperature of reinforcement. There are only a few possible measures of preventing or mitigating the effects temperature load used. Ways of protection can be divided into two systems: active and passive. Active systems are designed to ensure the greatest possible reduction of temperatures the concrete is exposed to. Passive systems directly resist to high temperatures and fire. Design of composition of concrete with the aim of higher resistance to exposition to high temperatures belongs among the passive systems. A part of the work focuses on summary searches of the problems of concrete and reinforced concrete structures exposed to high temperatures and fire. The goal of the work is defining requirements for cement matrix based composite material and its design ensuring the highest possible resistance to high temperatures or direct fire.
35	Optimization and Control of Smart Renewable Energy Systems Aldaouab, Ibrahim January 2019 (has links) No description available. Electrical Engineering Energy Mechanical Engineering
36	Behavior of Adjacent Prestressed Concrete Box Beam Bridges Containing Ultra High Performance Concrete (UHPC) Longitudinal Joints Semendary, Ali A. 13 July 2018 (has links) No description available. Civil Engineering Box beam bridge Shear key Longitudinal crack UHPC Connection Dowel bar Truck load Thermal load Temperature Moment distribution factor Finite element modeling Field test Dynamic amplification factor
37	Vliv prosklení na vnitřní mikroklima objektů / The influence of microclimate on the inside glass objects Dvořáková, Hana January 2013 (has links) This master thesis deals with the influence of glazing on the microclimate inside buildings. In particular, I focused on the shading coefficient and the various factors that affect it. The thesis also concentrates on the origin and composition of the solar radiation, the formation of thermal stress and refraction. In the next part of the thesis, I focused on designing two variants of shielding factor and its impact on the thermal load of gym, sports hall and the related necessary changes. The last part of the thesis deals with experimental measurements of incident solar radiation passing through the window into real physical model. From the measured values, we determined realistic shading coefficient and then applied it in the previous section of this thesis.
38	Vliv stavební konstrukce na tepelnou zátěž prostoru / Effect of building construction on thermal load of space Výravská, Zdeňka January 2014 (has links) This master’s thesis focuses on effect of outer building construction on thermal load of space. The effect of translucent and non-translucent construction is discussed. The project of air-conditioning system is prepared for the two alternatives of the translucent construction, including the purchase price of the airconditioning system and glazing and the savings on summer cooling. Afterwards the period of the recovery of investment is calculated. The plan of the airconditioning system is connected to my bachelor’s thesis “Airconditioning in the car showroom”, the subject of which was the plan of the airconditioning system of the car showroom.
39	Vývoj požárně odolných správkových malt s jemnozrnným plnivem / The development of fire-resistant repair mortars with fine-grained filler Záruba, Jiří January 2015 (has links) The diploma thesis is focused on fire-resistant repair mortar with fine-grained filler. The aim of this work is the research and development of fine-grained Mortars resistant to high temperatures, which are characteristic at the beginning of the fire. The theoretical knowledge with subsequently realized laboratory verification was used. At-tention was paid to the masses based on the mixed binder comprising cement and blast furnace slag, respectively. high-temperature ash. Cellulose fibres were used as the dis-persed reinforcement. Two kinds of aggregate were assessed - fly ash agloporit and am-phibolite incl. combinations thereof. Laboratory tests were carried out via determination of basic material properties (density, strength, consistency, dimensional changes etc.) after exposure to extreme temperatures. A substantial part of the research was also study of different cooling conditions - slow and fast (water and air). Selected formulations were subjected to temperatures up to 1200 ° C. In the conclusion is selected several recipes that have been found to be optimal for continuing research on the basis of the results and findings.
40	Lávka pro pěší přes řeku Labe / Pedestrian bridge across the river Labe Libiger, Martin January 2015 (has links) The thesis deals with a design of the river Labe bridging in the city Hradec Kralove. In order to make option for cyclists and pedistrians to cross between shores. There were made three design variants. For detailed solution curved twin-arm arched structure was chosen. The aim of the thesis was design and assessment of Bering strucutre of the footbridge according ultimate limit states and serviceability limit state given by valid Eurocodes.

Search results