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1
tesis de maestría
Since its introduction by Shinbrot, numerous variations of parameter identification based on the Modulating Function Technique (MFT) have been developed. Recently researches have achieved to estimate also states through this method. In this thesis, the MFT is utilized for the estimation, of both parameters and states, that lead to observe the behaviour of the vertical suspension forces on a vehicle over time. In order to deal with the frequency disturbances present by perturbations as measurement noise and vibrations, the Fourier Modulating Function (FMF) as a kernel is proposed. Furthermore, this method is implemented with the concept of sensor fusion. The estimation that results after the implementation of an adaptive observer during the present work is going to show the robustness of the studied technique.
2
tesis de maestría
Since its introduction by Shinbrot, numerous variations of parameter identification based on the Modulating Function Technique (MFT) have been developed. Recently researches have achieved to estimate also states through this method. In this thesis, the MFT is utilized for the estimation, of both parameters and states, that lead to observe the behaviour of the vertical suspension forces on a vehicle over time. In order to deal with the frequency disturbances present by perturbations as measurement noise and vibrations, the Fourier Modulating Function (FMF) as a kernel is proposed. Furthermore, this method is implemented with the concept of sensor fusion. The estimation that results after the implementation of an adaptive observer during the present work is going to show the robustness of the studied technique.
3
artículo
Publicado 2021
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This work describes an electrochemical sensor for the selective recognition and quantification of amoxicillin and a β-lactam antibiotic in real samples. This sensor consists of a carbon paste electrode (CPE) modified with mag-MIP (magnetic molecularly imprinted polymer), which was prepared by precipitation method via free radical using acrylamide (AAm) as functional monomer, N,N′-methylenebisacrylamide (MBAA) as a crosslinker, and potassium persulfate (KPS) as initiator, to functionalized magnetic nanoparticles. The magnetic non-imprinted polymers (mag-NIP) were prepared using the same experimental procedure without analyte and used for the preparation of a CPE for comparative studies. The morphological, structural, and electrochemical characteristics of the nanostructured material were evaluated using Field emission gun scanning electron microscopy (FEG-SEM), Transmission electron mi...
4
artículo
Publicado 2021
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This project was supported by FONDECYT-BM (grant #0232019-FONDECYT-BM-IN.INV), FAPESP (grants #2019/006777 and #2014/50945-4), CNPq (grants #301728/2019-4, #408050/2018-7 and #465571/2014-0), and CAPES (PROJ. AUX/PE/PROEX N. 0674/2018). RL and GP received financial support from the OGI, Research Management Bureau (Project FC-F-6-2018).
5
objeto de conferencia
Publicado 2015
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A sensor based on molecularly imprinted polymers (MIP) was developed for determination of 3-(3,4-Dichlorophenyl)-1,1- dimethylurea (diuron). The MIP were synthesized by free radical polymerization in wich diuron acted as template, methacrylic acid (MAA) acted as functional monomer and ethylene glycol dimethacrylate (EGDMA) acted as crosslinker. For construction of the sensor, glassy carbon electrode was modified with Nafion® and MIP/NIP (non imprinted polymer) to see the contribution of MIP, as a film, in the diuron recognition. Differential Pulse Voltammetry was used to the quantification of diuron in a range of response 0.4 - 1.2 V in a PBS (pH=8). All parameters affecting the sensor were optimized. The sensor showed a linear response from 1.00x10-5 to 9.616x10-5 M in PBS 0.1 M (pH=8). The limit of detection was 0.58x10-5 mol L-1. The nanostructured sensor was prepared using carbon na...
6
tesis de maestría
Publicado 2017
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Tuberculosis is a leading killing disease worldwide with more than 9 million people a ected per year. Current diagnostic methods exhibit several disadvantages; one of the most promising alternatives to overcome this is the development of nanostructured diagnostic systems which are able to detect molecules associated with certain diseases. Graphene since its discovery has been the focus for the development of these sensing elements due to its excellent electronic properties. In this work, a graphene-based eld e ect transistor (FET) has been developed for tuberculosis DNA detection, in order to set the basis for a diagnostic method that overcomes current limitations. The sensing elements composed of graphene monolayers were manufactured in the stages of annealing of the substrate, addition of the linker and functionalization with the addition of a probe DNA for tuberculosis detection. Addi...
7
tesis de maestría
Publicado 2017
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Tuberculosis is a leading killing disease worldwide with more than 9 million people a ected per year. Current diagnostic methods exhibit several disadvantages; one of the most promising alternatives to overcome this is the development of nanostructured diagnostic systems which are able to detect molecules associated with certain diseases. Graphene since its discovery has been the focus for the development of these sensing elements due to its excellent electronic properties. In this work, a graphene-based eld e ect transistor (FET) has been developed for tuberculosis DNA detection, in order to set the basis for a diagnostic method that overcomes current limitations. The sensing elements composed of graphene monolayers were manufactured in the stages of annealing of the substrate, addition of the linker and functionalization with the addition of a probe DNA for tuberculosis detection. Addi...
8
tesis de maestría
Publicado 2021
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Die menschliche Hand ist in der Lage, verschiedene Greif- und Manipulationsaufgaben auszuführen und kann als einer der geschicktesten und vielseitigsten Effektoren angesehen werden. In dieser Arbeit wurde ein Soft Robotic-Greifer entwickelt, der auf den Erkenntnissen aus der Literatur zur Taxonomie der menschlichen Greiffähigkeiten und den biomechanischen Synergien der menschlichen Hand basiert. Im Bereich der Roboterhände sind sehnengetriebene, unteraktuierte Strukturen weit verbreitet. Inspiriert von der Anatomie der menschlichen Hand, bieten sie durch ihre Flexibilität passive Adaptivität und Robustheit. Es wurde ein Sensorsystem implementiert, bestehend aus Force Sensing Resistors (FSRs), Biegungssensoren und einem Stromsensor, wodurch das System charakterisiert werden kann. Die Kraftsensoren wurden in die Fingerkuppen integriert. In Anlehnung an die menschliche Haut wurden Abg...
9
tesis de maestría
Publicado 2021
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Die menschliche Hand ist in der Lage, verschiedene Greif- und Manipulationsaufgaben auszuführen und kann als einer der geschicktesten und vielseitigsten Effektoren angesehen werden. In dieser Arbeit wurde ein Soft Robotic-Greifer entwickelt, der auf den Erkenntnissen aus der Literatur zur Taxonomie der menschlichen Greiffähigkeiten und den biomechanischen Synergien der menschlichen Hand basiert. Im Bereich der Roboterhände sind sehnengetriebene, unteraktuierte Strukturen weit verbreitet. Inspiriert von der Anatomie der menschlichen Hand, bieten sie durch ihre Flexibilität passive Adaptivität und Robustheit. Es wurde ein Sensorsystem implementiert, bestehend aus Force Sensing Resistors (FSRs), Biegungssensoren und einem Stromsensor, wodurch das System charakterisiert werden kann. Die Kraftsensoren wurden in die Fingerkuppen integriert. In Anlehnung an die menschliche Haut wurden Abg...
10
artículo
Publicado 2025
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Correctly executing exercises during training is of vital importance to ensure adequate athletic performance. Sit-ups are among the most frequently performed exercises requiring proper evaluation. This exercise contributes to increasing abdomen strength, having better posture to reduce back problems, and improving overall physical condition and appearance, among other benefits. Existing methods for evaluating the correct execution of sit-ups are manual, subjective, and inefficient in terms of time, cost, and precision. Therefore, there is a need to have technological tools that measure and monitor core abdominal strength while simultaneously verifying, through image processing, the correct execution of the exercise. Since no solutions with these capabilities have been found in the literature, this work proposes a system that performs these functions using electromyographic (EMG) sensors,...
11
tesis de grado
Publicado 2022
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Universidad Nacional Agraria La Molina. Facultad de Ingeniería Agrícola. Departamento Académico de Recursos Hídricos
12
artículo
Publicado 2023
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Inertial kinetics and kinematics have substantial influences on human biomechanical function. A new algorithm for Inertial Measurement Unit (IMU)-based motion tracking is presented in this work. The primary aims of this paper are to combine recent developments in improved biosensor technology with mainstream motion-tracking hardware to measure the overall performance of human movement based on joint axis-angle representations of limb rotation. This work describes an alternative approach to representing three-dimensional rotations using a normalized vector around which an identified joint angle defines the overall rotation, rather than a traditional Euler angle approach. Furthermore, IMUs allow for the direct measurement of joint angular velocities, offering the opportunity to increase the accuracy of instantaneous axis of rotation estimations. Although the axis-angle representation requi...
13
artículo
Publicado 2023
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Inertial kinetics and kinematics have substantial influences on human biomechanical function. A new algorithm for Inertial Measurement Unit (IMU)-based motion tracking is presented in this work. The primary aims of this paper are to combine recent developments in improved biosensor technology with mainstream motion-tracking hardware to measure the overall performance of human movement based on joint axis-angle representations of limb rotation. This work describes an alternative approach to representing three-dimensional rotations using a normalized vector around which an identified joint angle defines the overall rotation, rather than a traditional Euler angle approach. Furthermore, IMUs allow for the direct measurement of joint angular velocities, offering the opportunity to increase the accuracy of instantaneous axis of rotation estimations. Although the axis-angle representation requi...
14
artículo
Publicado 2022
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The purpose of this article is the design and implementation of an automation prototype for public lighting systems; Likewise, a model is built to test the functioning of the implemented prototype, simulating the provision of public lighting service automatically. In the prototype implementation, the Arduino board, LDR sensor and LED diodes were used; The monitoring graphical interface was developed in the block-based language mBlock, due to its friendly language characteristics to develop interfaces in a simple way, without the need for advanced knowledge of programming languages. The methodology used in the development of the prototype is based on 4 phases: understanding the problem, plan of activities, execution of activities and testing or evaluation of the solution. This work was developed in the Information Management course with students of the II cycle of the industrial engineeri...
15
artículo
Publicado 2024
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Landslides, triggered by heavy rains, constitute globally impactful natural disasters that wreak havoc on both people and infrastructure. It is crucial to develop predictive systems and efficient alerts, incorporating technologies such as the Internet of Things (IoT) to gather environmental data and prevent significant losses. Therefore, the aim of the study was to design and develop an early warning system for landslides using a microcontroller-based wireless sensor network. A digital rocker rain gauge and the MPU 6050, DHT22 and FC-28 sensors were employed. These sensors were distributed at nodes along the Quebrada del Diablo in the city of Tacna. The values captured at each node were processed by the DEVKIT V1 NodeMCU-32 development board, based on the ESP32 microcontroller, and transmitted to a central node through a ZigBee mesh network using Digi's XBee3 devices. The central node wa...
16
tesis de maestría
Publicado 2024
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Se han descrito diferencias en la función autonómica en personas con condiciones del espectro autista en estado de reposo y estrés. Estas diferencias pueden estar asociadas a un procesamiento sensorial atípico y afecciones de salud mental, y tendrían un efecto cascada en el desarrollo de otras características propias del autismo. La presente revisión narrativa a tiene como objetivo sintetizar la literatura científica disponible respecto al uso de sensores biométricos en la investigación del estrés y la función autonómica de personas con condiciones del espectro autista. Se realizaron búsquedas en bases de datos electrónicas Scopus, Web of Science, PubMed y Medline de artículos publicados en inglés desde el 1 de enero de 2000 hasta el 1 de abril de 2023. En base a los estudios revisados se concluye que la función autonómica en el autismo es heterogéna, hay evidencia de...
17
artículo
Publicado 2022
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Methylmercury (MeHg) is one of the most toxic organic mercury compounds found in the environment. The continuous exposure of human beings to this highly toxic compound may damage their nervous system. The present work reports the development and application of a novel electrochemical sensing technique for the quantification of MeHg using a modified carbon paste electrode with multi-walled carbon nanotubes (MWCNTs) combined with ion imprinted polymer, which is highly selective toward MeHg (CPE/MWCNTs/IIP-MeHg) detection. The ion imprinted polymer was synthesized using 2-mercaptobenzothiazole (MBT), acrylic acid (AA) and MeHg employed as ligand, functional monomer and template ion, respectively, and the synthesized material was characterized by Raman spectroscopy and SEM-EDX. Both the proposed and control sensors were characterized by cyclic voltammetry (CV) and electrochemical impedance s...
18
tesis doctoral
Publicado 2020
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El presente trabajo de tesis tiene como finalidad la cuantificación del ion metálico Cd2+ en soluciones acuosas y muestras de agua mediante un sensor basado en un polímero híbrido impreso iónico (IIHP). Se sintetizaron varios polímeros híbridos impresos iónicos (IIHPs) mediante un proceso de polimerización utilizando Cd2+ como plantilla, 1-vinilimidazol (VIN) y 4-vinilpiridina (VP) como el monómero funcional, (3- mercaptopropil) trimetoxisilano (MP) y (3-aminopropilo) trimetoxisilano (AMP) como organosilano funcional, trimetacrilato de trimetilolpropano (TRIM) como agente reticulante y 2,2′-azobis-isobutironitrilo (AIBN) como iniciador radical. Para fines comparativos se sintetizaron su respectivo polímero sin impresión iónica (NIHP). La interacción del ion metálico Cd2+ con el átomo de nitrógeno del anillo de la piridina (VP) o del imidazol (VIN) y del grupo tiol (SH)...
19
tesis doctoral
Publicado 2021
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El presente proyecto de investigación tiene como finalidad estudiar la aplicación de sensores ópticos basados en polímeros iónicos impresos (IIP’s) para la determinación de Pb2+ presente en muestras de aguas, utilizando al rodizonato de sodio como reactivo quelante y monómeros funcionales seleccionadas mediante estudio de Teoría del Funcional de la Densidad (DFT). Los polímeros impresos sintetizados se caracterizaron mediante espectroscopía de infrarrojos por transformada de Fourier (FTIR), análisis termogravimétrico (TGA), Microscopía Electrónica de Barrido (SEM) y Espectroscopia de Energía Dispersiva de rayos X (EDX) y Análisis textural por el método de adsorción-desorción de N2 (BET). Los materiales obtenidos IIP-sulfo, IIP-acri e IIP-ali, se aplicaron para la remoción selectiva de Pb2+ de soluciones acuosas, a pH 6 y 5 mg de polímero. Los resultados experimenta...
20
tesis de grado
Publicado 2018
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The use of metallic nanoparticles in sensors is due to the characteristic properties of these materials at the nano scale, principally the increase in surface area. The surface area decreases when the nanoparticles agglomerate, with the need to support them in substrates with a high surface area. In this research work the self-assembly layer by layer method is studied to anchor silver nanoparticles in different carbons surfaces: hierarchical porous carbons, carbon nanotubes with different functionalities (Without functionalizing, functionalized with -COOH and -OH) and the effect is evaluated on the detection of free cyanide. The silver nanoparticles have been synthesized using two different reducing agents (sodium citrate and tyrosine). The characterization of the nanoparticles by cyclic voltammetry in acidic medium showed a characteristic peak of striping at 0,4 V; by Dynamic Light Disp...
