L’Imagerie par Résonance Magnétique fonctionnelle (IRMf) a connu un grand essor ces deux dernières décennies. En effet, l’arrivée sur le marché d’IRM de haute résolution (5 Teslas et dernièrement 7 Teslas) a permis l’étude des mécanismes cérébraux. Le travail de recherche de cette thèse s’inscrit dans ce contexte.Il s’agit de développer une instrumentation pour des études objectives du comportement cérébral sous l’effet de stimuli. Nous nous sommes intéressés à l’étude de l’olfaction. Nous avons conçu et réalisé un stimulateur olfactif à six canaux, synchronisable avec la respiration et contrôlable par ordinateur. L’originalité de notre travail réside en la modularité de notre appareil, qui en fait un dispositif adaptable aux besoins des études. Nous proposons une approche innovante pour modifier l’intensité des stimulations délivrées : la Modulation de Largeur d’Impulsion (MLI).Cet appareil a été utilisé dans plusieurs études en IRMf. L’efficacité de la MLI est mise en évidence dans une étude psychophysique décrite dans ce manuscrit. / The Magnetic Resonance Imaging (fMRI) has been developing for twentyyears. Indeed, the marketing of high-resolution MRI (5 Tesla and 7 Tesla recently)allowed the study of brain mechanisms. The research work of this PHD was todevelop instrumentation for objective studies of brain behavior during a sensorystimulation. We are interested in the study of olfaction. We have designed and builta six-channel olfactometer, synchronized with breathing and controlled by computer.The originality of our work lies in the modularity of our device, which makes itadaptable to a wide range of studies. We also propose an new method to changethe intensity of stimulation delivered : the Pulse Width Modulation (PWM). Thisdevice has been used in several studies in fMRI. The effectiveness of the PWM ishighlighted in a psychophysical study described in this manuscript.

This thesis deals with designing a portable indicator for measuring of content of ferromagnetic phase in non-ferromagnetic steels. The first part of the thesis describes the principle of sensor used in the indicator. A market survey is presented, with a description of selected indicators that are suitable for measurement of content of ferromagnetic phases. The following part deals with a design of the device hardware, which is focused on finding a suitable indicator concept. Circuits for battery charge, measuring chain and other circuits are designed in this part. The following part of the thesis describes the function of the software. First it describes the software for DSP, then the software for personal computer. The software for DSP has been programmed in the C language, the software for the personal computer in the C# language. The last part but one describes an inspectional measurement of the indicator. This measurement has been performed on testing samples as well as other materials. The final part presents a summary of the outcomes and provides recommendations for possible improvement.

This work describes the design of audio amplifiers operating in switching mode. The first part describes basic principles of the power stage switching concept. There is described differences between classes of amplifiers according to technology. The second larger part includes design and construction of the switching amplifiers. Design is implemented, including the preamplifier and power supply. Power supply works in switching mode. The measured parameters of the proposed facility are given in the last part.

Contents of the thesis is to design and create an expansion board for the BeagleBoard computer one plate . The first and very important part was to find out all the possibilities for an extension of the computer itself . Choose the right expansion port . To study the possibility distribution of individual pins . Followed by the appropriate extension election districts that demonstrate the function of each enlargement . Test was designed PCB that contains circuits that change the voltage level of the BeagleBoard to protect a mini computer to the testing of each gusset periphery prevent damage to itself or part of the BeagleBoard . The peripherals themselves bind different parts of theoretical introduction. More specifically the extension of the LCD display is selected segment and includes two lines of 16 characters . When the possibility to add additional components were necessary to deal with the shortcomings of the output pins , this problem was solved by using an expander . He extends itself BeagleBoard by another 16 pins . On these pins are connected together on the LCD matrix keyboard . The creation of the board are two circuit temperature sensors , but have a different type of communication using I2C and one second using 1 -Wire bus . The board also contains various other bus outputs , for example, UART bus. It also contains an output pin which can be controlled PWM modulation . The remaining pins are versatile GPIO pins which can be programmed to define a function using the Linux operating system . The result is a final board of the package control programs which make it possible to verify the individual peripherals.

This master’s thesis presents new tendency in automotive lighting – matrix LED headlamp. This thesis consists of description of matrix headlamp construction, main functions of matrix headlamp and controlling by using new integrated circuit, developed by ON Semiconductor Company. The aim of this project is concept of algorithm, which provides correct function of integrated circuit. A part of this thesis is to develop and assembly evaluation kit with this integrated circuit, which will be use to present integrated circuit for customers.

The Thesis provides the project and realization of non-linear system, consisting of direct electric motor and dynamo that are linked together with flexible connector. Firstly, there are decscribed the principles of turns control in direct motor. Secondly, the thesis shows the construction of operating panel with microcontroller PIC16F877. Finally, the last part brings the evaluation of mesurements and suggests various improvements of the operational panel.

The term real-time operating system for embedded aplications has great importance today. This thesis descbires robitc arm control by mC/OS-II system on MC9S08JM60 platform. Robotic arm uses three servomotors HS-311 for motion, which are controlled by PWM. PWM pulse width is set according to the loaded data from the accelerometer, which is placed on DEMOJM board.

This diploma thesis deals with the study of different robotic chassis types, their properties and selected types of sensors, including their characteristics. Furthermore, the design and implementation of my own robotic chassis is presented. This robotic chassis was realized and all plans and production drawings are presented in my thesis. The software ( rmware) for the control of my robotic chassis, including obstacle avoidance, is described in detail. The following chapter deals with tests of my chassis in various situations. The maximal and minimal limits of the realized robotic chassis are discussed in the final chapter.

No description available.

A dominating source for the radiated acoustic noise from a train at low speeds is the traction motor. This noise originates from electromagnetic forces acting on the structure resulting in vibrations on the surface and thus radiated noise. It is often perceived as annoying due to its tonal nature. To achieve a desirable acoustic behavior, and also to meet legal requirements, it is of great importance to thoroughly understand the generation of noise of electromagnetic origin in the motor and also to be able to control it to a low level. In this work, experimental tests have been performed on a traction motor operated from pulse width modulated (PWM) converter. A PWM converter outputs a quasi-sinusoidal voltage created from switched voltage pulses of different widths. The resulting main vibrations at PWM operation and their causes have been analyzed. It is concluded that an appropriate selection of the PWM switching frequency, that is the rate at which the voltage is switched, is a powerful tool to influence the noise of electromagnetic origin. Changing the switching frequency shifts the frequencies of the exciting electromagnetic forces. Further experimental investigations show that the trend is that the resulting sound power level decreases with increasing switching frequency and eventually the sound power level reaches an almost constant level. The underlying physical phenomena for the reduced sound power level is different for different frequency ranges. It is proposed that the traction motor, similar to a thin walled cylindrical structure, shows a constant vibration over force response above a certain frequency. This is investigated using numerical simulations of simplified models. Above this certain frequency, where the area of high modal density is dominating, the noise reducing effect of further increasing the switching frequency is limited. / <p>QC 20180109</p>