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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
151

Analýza kauzálního vztahu mezi kardiovaskulárními signály / Causal interaction analysis of cardiovascular signals

Tiurina, Mariia January 2019 (has links)
Application of the non-invasive methods to detection of the baroreflex sensitivity is a correct way to evaluate the functions of cardiovascular system. This master’s thesis describes the theoretical informations about the problem of baroreflex sensitivity from anatomical, patalogical and clinical views. Theoretical knowledges are foundation for mathematical description of some methods to detection of baroreflx sensitivity in time, frequency and information dimensions. In the practical part of the master’s theses are presented two methods of BRS detection – sequence method based on finding the specific sequences of time series signals and method of application bivariante autoregressive model. Both of methods are implemented in MATLAB. The results of testing data on real data are discussed.
152

Monitorovací systém vodních toků s GSM komunikací / River mionitoring system with GSM communication

Pačinek, David January 2014 (has links)
This master thesis is dedicated to system of water monitoring for use of alternative source power supply and GSM communication. The thesis carried out research on the possibilities to take measurements on watercourses, also detailed research of photovoltaic panel, available accumulators and their charging and a synopsis of similar systems. Furthermore, the master thesis also captures design and implementation datalogger device type with possibility to send measured data to the website.
153

Vliv provzdušnění a ošetřování na vývoj modulu pružnosti betonu / Influence of Air Entrainment and Curing on Development of Elastic Modulus of Concrete

Bartulíková, Radka January 2013 (has links)
Master's thesis deals with influence of various factors on the concrete compressive strength and modulus of elasticity. This work concentrates mainly on the influence of early curing and air entrainment of concrete. One part of this work is the evaluation of laboratory measurement, which was carried out on cubes of standard and norm prisms. The development of elastic moduli was monitored in time to 730 days of age with respect to air entrainment and curing conditions. The second part of the experiment deals with a comparison of theoretical creep curves depending on the value of the modulus of elasticity based on different standards. Again, the air entrainment effect and influence of initial conditions are reflected.
154

SNIŽOVÁNÍ HODNOTY STAVENIŠTNÍHO HLUKU POMOCÍ MODELOVÁNÍ VÝROBNÍHO PROSTORU STAVBY A ÚPRAV TECHNOLOGICKÝCH POSTUPŮ PŘI VÝSTAVBĚ / REDUCING THE VALUE OF CONSTRUCTION NOISE BY MODELING THE PRODUCTION AREA OF CONSTRUCTION SITE AND BY ADJUSTING THE TECHNOLOGICAL PROCEDURES DURING CONSTRUCTION

Kantová, Radka Unknown Date (has links)
This doctoral thesis focuses on noise generated during construction. It defines the legislative and physical aspects of this topic. It determines heavy machinery as noise source and categorizes them by their usage in construction technologies. It collects source data of the machinery noises which can be further used in prognostic models. It analyses the level of construction noise which can impact the nearby residential areas and offers methodology for modelling and designing the possible arrangements for the noise reduction. It defines partial effects of the construction site which are significant for the noise spreading. It establishes their role in the value of acoustic pressure level of the noise affecting the façade of the considered building. With the data collection and with case study verification it offers a prepared work tool which can be easily used to predict noise levels on construction sites and can be applied in the early constructions preparations. The structure of this thesis is planned for possible usage as university textbook or study support.
155

Problematika testování stříkaných betonů / The Issue of testing shotcrete

Škapová, Pavla January 2014 (has links)
The master‘s thesis focuses on testing the shotcrete prepared in laboratory conditions. The main observed properties are compresive strenght of shotcrete and modulus of elasticity. The aim is assessment of methods for measuring those parameters. The calibrating correlations for strenght characteristics of shotcrete are given by obtaining the results of used methods. The shotcrete composition, amount and type of accelerating additive as well as economic aspect of using shotcrete is also assessed.
156

Verifikace nelineárních materiálových modelů betonu / Verification of nonlinear material models of concrete

Král, Petr January 2015 (has links)
Diploma thesis is focused on the description of the parameters of nonlinear material models of concrete, which are implemented in a computational system LS-DYNA, interacting with performance of nonlinear test calculations in system LS-DYNA on selected problems, which are formed mainly by simulations of tests of mechanical and physical properties of concrete in uniaxial compressive and tensile on cylinders with applying different boundary conditions and by simulation of bending slab, with subsequent comparison of some results of test calculations with results of the experiment. The thesis includes creation of appropriate geometric models of selected problems, meshing of these geometric models, description of parameters and application of nonlinear material models of concrete on selected problems, application of loads and boundary conditions on selected problems and performance of nonlinear calculations in a computational system LS-DYNA. Evaluation of results is made on the basis of stress-strain diagrams and load-displacement diagrams based on nonlinear calculations taking into account strain rate effects and on the basis of hysteresis curves based on nonlinear calculations in case of application of cyclic loading on selected problems. Verification of nonlinear material models of concrete is made on the basis of comparison of some results of test calculations with results obtained from the experiment.

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