Rocío García-Cortés

Se presenta un caso clínico de un paciente con deficiente estado de salud física que afecta negativamente la capacidad del trabajador para realizar sus funciones laborales. El paciente, masculino de 30 años, es referido por percepción de estrés, mala calidad de sueño, dolor corporal e hígado graso. Se le diagnosticó mediante examen clínico, química sanguínea; ultrasonido de hígado; pruebas de estrés laboral (EL) y fatiga laboral (FL); y se cuantificó cortisol en cabello. Se ministró por vía oral el suplemento 2.0 Algas Marinas, BioMaussan® (Astaxantina, AXT, fucoxantina, FXT y polifenoles de manzana, PM), durante 3 meses. Los resultados muestran efectos benéficos, disminuyendo EL, FL, cortisol capilar, peso (-4.7%), y parámetros bioquímicos (-1.58% a -25.45%), incluyendo bilirrubinas directas. Así también disminuyeron los síntomas de cansancio físico, agotamiento, somnolencia e irritabilidad, por lo que mejoró su calidad de vida. Se sugiere al paciente, dar tratamiento médico farmacológico y continuar con el suplemento 2.0 Algas Marinas hasta normalizar otros parámetros metabólicos y el ácido úrico. Estos hallazgos conducen a proponer un estudio clínico controlado, aleatorizado, doble ciego para evaluar el mecanismo de acción molecular del suplemento 2.0 Algas Marinas, BioMaussan® en trabajadores con EL, FL y obesidad, particularmente sobre vía de acción de inhibición de cortisol, moléculas proinflamatorias y de daño oxidativo, además de estudiar referente al metabolismo de glucosa y de lípidos.

This paper presents a sliding mode control (SMC) for the “full-bridge Buck inverter–DC motor” system when a photovoltaic (PV) panel is considered as the power supply. The control executes the trajectory tracking task related to the angular velocity of the DC motor shaft without the need for electromechanical sensors. The proposed control is validated through realistic simulation results via Matlab-Simulink. In this regard, the system is constructed by using the electronic components of the specialized power systems library of Simscape. The results of the following four case studies are presented: (i) The performance of the closed-loop system considering two desired angular velocity profiles and three different incident solar irradiance shapes on the PV panel. (ii) An analysis associated with the primary energy source. (iii) A comparison of the proposed SMC versus a passive control. (iv) A study of the current ripple and its relationship with the execution of the tracking control task on the angular velocity.

By developing a robust control strategy based on the differential flatness concept, this paper presents a solution for the bidirectional trajectory tracking task in the “full-bridge Buck inverter–DC motor” system. The robustness of the proposed control is achieved by taking advantage of the differential flatness property related to the mathematical model of the system. The performance of the control, designed via the flatness concept, is verified in two ways. The first is by implementing experimentally the flatness control and proposing different shapes for the desired angular velocity profiles. For this aim, a built prototype of the “full-bridge Buck inverter–DC motor” system, along with Matlab–Simulink and a DS1104 board from dSPACE are used. The second is via simulation results, i.e., by programming the system in closed-loop with the proposed control algorithm through Matlab–Simulink. The experimental and the simulation results are similar, thus demonstrating the effectiveness of the designed robust control even when abrupt electrical variations are considered in the system.