This thesis is focused on the design of remote data transmission equipment, without access to mains power. The device will measure the voltage of the gas pipeline and send this information to the operator for processing. Analysis of today's technologies for long-distance transmission and based on the selected technology, the device will be designed. According to selected components, its power supply will be designed with the aim of long-term functionality and continuous operation.

This thesis is concerned to the study of behaviour of fibre composites with ceramics matrix. The composite consists of pyrolysed polysiloxane matrix reinforced by ceramic fibre Nextel 720. Main aim of this work is optimisation of fibre matrix interface through the selection of suitable precursor of the matrix with respect to temperature stability, sufficient strength and reasonable fracture toughness. Samples of matrices were exposed to the long term heat treatment in the range 1100 – 1500 °C. The mechanical properties as hardness and indentation elastic modulus were determined after heat treatment. Selected precursors of matrices were used for composite fabrication. Elastic modulus and fracture toughness at room and elevated temperatures were studied. Discussion is dedicated to the description of changes in mechanical properties with respect to chemical processes taking place during high temperature exposition. Further, reasons of fracture behaviour of composite materials are discussed, and finally, gained knowledge and outlined possibilities of subsequent development are summarised.

The diploma thesis deals with the stability determination of model O/W (30/70) emulsions at 25°C. In fact, the time and emulsifier concentration (Tego Care PS) dependences of physical properties (aging) were monitored. In the second part of the work, the influence of conservant on emulsion stabilities were studied. In order to study physical properties of emusions rheometry, differential scanning calorimetry (DSC) and optical microscopy were employed. The rheological measurement provided information on viscosity and viscoelastic modulus. DSC experiments used the repeated freezing/thawing cycles which allowed monitoring of changes in crystallization temperature of water present in emulsions and melting enthalpy of ice formed during the cooling. The optical microscopy was used to examine the change in oil droplet size in the course of emulsion destabilization and phase separation. In this case the image analysis was carried out using program HarFA. The results showed that due to the emulsion creaming, the oil droplets diffuse and aggregate which causes phase separation. Those processes were quickest for the emulsion with lowest emulsifier concentration 0.1 % (destabilization during 51 days) The emulsions with emulsifier concentration about 1.5 and 1.3 % were stable at least for 4 months. The presence of the coemulsifiers increased the elastic modulus and descreased the phase difference due to the network formation. It was shown that for the stability determination is necessary to use conservant due to risk of microbial contamination. DSC experiments allowed to distingush samples prepared under different conditions. Lower rotational speed during emulsion preparation caused the appearance of two melting and crystalization peaks while for higher speed only one peak was observed.

Presented thesis thesis is written for IBM Company, specifically IBM IDC Czech Republic, s.r.o. branch. The thesis describes development of statistic module for work database TIVOLE utilizing Lotus Notes program. The basic aim of the thesis is to ease creation of reports and graphical data outputs in relation to speed of operator´s work while narrowing down the required time of human resources for solving problems.

The target of this master's thesis is to describe, design and construct an extra low voltage three-phase DC/AC inverter for the motor AXI 5345/18, which will work in EC motor mode. The inverter is supplied by DC source 24 V. In order to save place, the wiring is designed on three separated printed board circuits. These are connected together by connectors for ribbon cables. The control is done by reverse current loop realized by active electronics and superior circuit MC 33035. The proper wiring of current loop is conformed for both control and testing of jet sensors ACS750. Power electronics of the inverter is realized by potential-free modul GWM 120-0075P3 consisted of 6 mosfet transistors. The designed wiring is not set for the concrete realisation, but it can be used for control of propulsion of the wheel, auxiliary propulsion of engine or in appliances, where servo with worse parameters of control loop is used in a sufficent way and it can be cheaper.

It is very difficult in real-time breaking the cryptographic algorithms used at present. The Classical cryptoanalysis is based on finding weaknesses in the mathematical structure of the algorithm. Discovery of side channels caused a substantial change in this science. Side-channel attacks are based on incorrect physical implementation of cryptographic algorithms. This new way attack changes notions about cryptography and security of systems. This master´s thesis contains a detailed description of the whole problem of side channels and deals with side-channel attacks on the RSA asymmetric algorithm. This thesis includes the design and realization of laboratory exercise, which is focused on the time attack on the RSA algorithm implementation.

The dissertation deals with a design of an intelligent transmitter of a standard current signal with an Ethernet output port, an implementation of a web interface and Modbus TCP protocol for providing data protection. The introductory part describes standardized analogue technical signals with their possibilities, and characteristics of industrial Ethernet. The subsequent part provides an overview of alternatives to connect analogue signals to Ethernet while using various modules. The thesis continues with a suggestion of an analogue input side of the transmitter in connection with a digital module of Ethernet based on the Rabbit processor in connection with the RCM3200 module. The key part of the dissertation puts forward a proposal of the firmware transmitter and control web interface, shows ways of providing figures measured by the current loop via Ethernet interface for further processing. The final part is devoted to a description of current transmitter ultimate measurement.

This master’s thesis contains a basic description of the function and wiring of Electronic tachograph RE1xx from company UniControls - Tramex. The main objectives of this thesis are design and implementation of a functional module, combining the four frequency inputs, two analog inputs and eight digital inputs. The proposed module must be fully compatible with current system of Electronic tachograph and must be according by the basic technical-law standards, which refer of this branch for application this device. Based on the analysis of methods of processing various signals are proposed several concepts of the input module. Individual concepts are described with advantages and disadvantages. On the design concept of this module, followed by a description of the speed sensor, is placed on the redress of vehicle. Design of circumferential involvement of the chosen conception is detailed described and divided into several parts (controlling part, frequency inputs, analog inputs, binary inputs). In this module is accent on increased reliability and interoperability, which is achieved by using for example: power monitor, external watchdog, etc. For realization prototype is a part of thesis design of the PCB. Thesis includes theoretical calculations, which is needed for the design of software. On a functional input module is developed and debugged operating firmware, which is based on single-fiber design of the program. To measure the actual speed are debugged two algorithms - method of periodic sampling and the method of external interrupt. The following is a description of the measurement and processing of analog and digital signals (used algorithms suppress oscilation of input signals). The result of this master’s thesis is functional Module of frequency, analog and digital inputs, which measures vehicle speed, distance covered, direction of movement, two analog signals and evaluates states of the binary signal. Preprocessed data are sent to a Module of central processor through serial communications RS485.

This thesis describes the parameters of electrical energy with a focus on low voltage characteristics and their measurement with respect to the parameters required by standards. In addition, one chapter deals with monitoring of the quality electric energy. Measurement organizations, calculation of power quality and the data collection for its calculation is referred here. For the illustration, the example of a distributed monitoring system from practice is described. The second part deals with the design and implementation of a module for measuring power quality , namely by measuring the voltage characteristics. It describes the selection of the chosen solution, hardware part and firmware for the MCU. To display the measured data, application was created by the Java programming language. The application allows the visualization of the voltage measured Low voltage grid with single phase voltage RMS value 230.

The work deals with communication options, the power line and particularly the use of this technology in home automation to control heating and reduction in standby mode for selected domestic appliances. The issue is outlined in detail first and then examined in detail. The publication outlines a possible variant of such a device that can detect movement in the house and on the basis of such information to adjust the energy profile. The device is from its base designed to minimize the consumption of heat and electricity.