Nowdays, optical fibers are one of important parts of computer networks, especially for their ability to transfer information for long distance. This thesis doesn´t utilize optical fibers as carriers, but as sources of information, specifically as sensors intended to detect physical effects acting on the optical fiber, which is usually used for telecommunication purposes. Linear and nonlinear properties of the fiber are used to gain information about acting effects on the optical fiber.

The title of the thesis: The Identification of Substances in Real Samples Using Portable Raman Spectrometer The portable Raman spectrometer Ahura First Defender is a device designated for identifying unrecognized solid and liquid substances. The aim of this diploma thesis was to test the efficiency of the portable Raman spectrometer First Defender and to draw up a draft of the methodology for its manipulation. The objects of the investigation were the accuracy of results and collection of findings coming out of measuring tests using the device mentioned above. The introduction part briefly describes problems of chemical monitoring within Fire Rescue Service of the Czech Republic. As a partly solution of the problems could be the use of the portable spectrometer First Defender. Further are described problems of sampling and possibilities of sample detection through means of chemical reconnaissance. As next, there is described the device itself including the principle of Raman effect that allows the device to identify unrecognized solid and liquid chemical substances. The practical part explains the procedure and the way of applied measuring tests when using the device. The results are summarized in charts and the percentage of successful performed tests analyzed in charts. Findings concerning the manipulation with the device, methods for sample modification and the influence of sample matrix on the identification of selected chemicals in observed samples are introduced in the discussion. Professional knowledge and experience were used to draw up guidelines for the identification of substances in real samples conceived as general informational source describing procedures, rules, and recommendations. Upon all outcomes and findings, there was confirmed the hypothesis of greatly beneficial using Raman spectrometer in Fire Protection Units when identifying unknown substances at places of intervention at the end of the thesis.

The diploma thesis Simulation of Multipath Propagation of Multistate Modulations is focused on the development of an appropriate algorithm in MATLAB environment, which is capable to simulate the impact of the multipath propagation on received signal (error rate) on the basis of given parameters of the transmission channels. Mechanisms and characteristics of the wave propagation in communication environment, types of digital modulations and their most important parameters are described in the first part of this thesis. The second part is focused on the simulation itself. Created GUI (Graphical User Interface) is able to display constellation diagrams of transmitted and received signals, as well as their bit error rate. It is also possible to compare these data with the data of signal, which is passed by a non-fading channel.

The objective of this diploma thesis is a dynamic analysis of a cable-stayed walkway. The RFEM structural analysis software is used for the calculation. Design principles of the structure are explained and analysis of the construction phases is then performed. The eigenmodes of the structure are calculated for various material combinations. The thesis examines the effects of moving loads and earthquake effects using several different methods. A comparison of the various loading effects on the structure and also the calculation methods is presented at the conclusion.

The aim of master's thesis is to get familiarized with the problems of measurement and analysis of seismic waves. Theoretical part deals with the description of seismic waves, especially their types, sources and properties. Attention was afterwards focused on the measurement systems of these waves, emphasis was placed on their principles and advantages. The practical part discusses methods of noise reduction and highlighting of significant events in measured data. At the end, individual methods are implemented into user-friendly graphical interface.