Ciencias Exactas y Ciencias de la Salud
Permanent URI for this collectionhttps://hdl.handle.net/11285/551039
Pertenecen a esta colección Tesis y Trabajos de grado de las Maestrías correspondientes a las Escuelas de Ingeniería y Ciencias así como a Medicina y Ciencias de la Salud.
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- Advanced control strategies for small wind turbine MPPT and stress reduction(2017-12-05) Garcia Vera, Marco Antonio; Probst Oleszewski, Oliver Matthias; Favela Contreras, Antonio; Vargas Martínez, AdrianaThis thesis demonstrates the functionality of a single-input single-output adaptive predictive control(APC) strategy , focused on power tracking and stress reduction. A modified recursive least squares algorithm was designed to improve the adaptive mechanism and eliminate poor sensitivity malfunctions and a estimator wind up problem. The real implementation of the modification shows a high improvement in the adaptive mechanism’s reliability and the certainty of its estimations. An objective function that combines stress and power was designed and tested. Results indicate that the function achieves an important stress reduction with a slight decrement on power, therefore, validating the design. The performance of the APC and a proportional, integral and derivate (PID) controller following the objetive function under different conditions was analyzed and compared. The system was tested under a constant and a variable wind input with different configurations i.e. a wind series with gust or no presence and with a high or low turbulence with possible wind mean speed values of 6 m/s and 8 m/s.Experimental results show the APC’s tracking error in power, stress and voltage is significantly lower than the one obtained using the PID controller. The variable wind speed ws achieved using a LabVIEW application that sends information to an Arduino Due microcontroller that executes the control algorithms.
- Full Potentiostat System with wireless communication in a Programmable-System-On-a-Chip and a PC(2017-12-01) Muñoz Martínez, Adrián Iván; Assad Dieck, Graciano; Ávila Ortega, Alfonso; Rodríguez Delgado, José Manuel; González Peña, Omar Israel; Colomer Farrarons, JordiThis thesis is about the development of a Potentiostat System. The objective is to have a device capable of being embedded in rotary disk platforms and watches. Hence, some of the features are the small size and the low power consumption. The dissertation addresses those concerns thought a Programmable-System-on-a-Chip demonstrating that this solution is a good approach. Thus, this document explains from the circuit design until the validation of the entire system. A series of steps establish the path to reach the objectives. The circuit review describes relevant configurations to control the voltage and read the Redox current. The prototype design explains the circuits implementation in hardware and the development of electrochemical trials in software. A characterization allows us to make the proper compensations to have accurate results. The completion of several electrochemical experiments validates the embedded system capacity, and it establishes the working range of the applications. Therefore, it is easy to accomplish the objectives with all this in mind. As results, the Potentiostat System is capable of handling negative and positive Redox currents in the range of 86.44 to 3000 nA and the voltage control is of ± 2 volts. The samples per second of this device goes from 50 to 2000. All these features make the prototype suitable for health, environmental, and research applications. Biosensors to detect glucose, melatonin, hydrogen peroxide, nitrite, and the xanthine oxidase enzyme are examples of specific applications for this electronic system. Therefore, the Programmable-System-on-a-Chip strategy is suitable to develop portable and low energy devices.
- Integration of synthetic optical holography in a commercial confocal scanning microscope unit(2017-05-15) Canales-Benavides, Arturo A.; Hernández Aaranda, Raúl I.; Carney, P. Scott; López Mago, DorilianThis thesis is an effort to integrate a relatively new imaging technique called Synthetic Optical Holography (SOH) in commercial confocal scanning microscopes. In this work, we specifically present an integration with a Zeiss 710 confocal microscope. We explored different integration alternatives based on cost, compatibility and functionality. Also, we validated our proof of concept by using the capabilities of this integrated system on biological samples. We successfully retrieved the phase and amplitude of cheek and stem cells. Chapter 1 provides a brief introduction to classical optical holography and its evolution since it was conceived. Subsequently, we present the ideas of Quantitative Phase Imaging (QPI) and its profound relationship with Digital Holographic Microscopy (DHM), which is an imaging technique that has been gaining popularity during the past 20 years. After that, we present the theoretical basis of SOH and its development since it was conceived. Then, we make a brief review about Confocal Microscopy (CM) and its advantages compared to wide-field microscopy. Right away, we present a briefly discussion about the efforts made in the scientific community to combine DHM and CM. Those ideas represent the conceptual frame in which SOH and confocal scanning microscopy converge. Finally, some remarks about the importance of SOH are made. In Chapter 2 we present a characterization tool based on pseudoheterodyne interferometry with the motivation to have a method to characterize the z-stages implemented in non-linear SOH. Also, we propose a Mean Squared Error (MSE) optimization algorithm in order to process the data from the experiment and to be able to estimate the amplitude and drift of the z-stages. We validate the functionality of our approach by characterizing a nanopositioning piezo stage from Physik Instrumente (PI) and a ceramic piezo electric from Thorlabs. Finally, we present a discussion and some remarks about this approach. In Chapter 3 we present a successful integration of SOH in a Zeiss 710 confocal microscope. We compare different alternatives of integration in terms of cost and compatibility. Also, we describe the process followed to implement the system, installation of the devices, preparation of the samples, etc. Then, results obtained from using this new integrated system are presented in order to validate the functionality of SOH in the confocal unit. We used SOH in the Zeiss microscope to recover the amplitude and phase of biological samples. Then, we present a discussion about the several factors that should be taken into account when trying to implement SOH in commercial microscopes such as cost, compatibility, and functionality. Finally, we discuss some remarks about this implementation. Finally, in Chapter 4, we present our conclusions about the ideas developed in Chapters 2 and 3. We also discuss the advantages and disadvantages of the SOH modular system implemented and some future work to improve the technique.