1,046 research outputs found
Performance evaluation of a DC-AC inverter controlled with ZAD-FPIC
Introduction− Power converters are used in mi-crogrids to transfer power to the load with a regulated voltage. However, the DC-AC converters present distor-tions in the waveform that can be improved with the help of real-time controllers.Objective−Evaluate the response in alternating cur-rent of the buck converter controlled with the ZAD-FPIC technique.Methodology−Based on the differential equations that describe the buck power converter, the ZAD and FPIC controllers are designed. Afterwards, simulations of the complete controlled system are made using Simulink of MATLAB. Then, the system is implemented experi-mentally and the controller is executed in real-time with the help of a DS1104 from dSPACE. In the end, several tests are carried out to check the effectiveness of the controller.Results− The results show that the controller allows good stability against different variations in the system and in the load.Conclusions−The ZAD-FPIC technique controls the variable and tracks changes in the waveform, magni-tude, and frequency of the reference signal. The control-ler presents good stability to different tests, tracking the reference signal after each event.Introducción− Los convertidores de potencia son utili-zados en las micro redes para transferir la potencia a la carga con una tensión regulada. Sin embargo, los conver-tidores DC-AC presentan distorsiones en la forma de onda que pueden ser mejoradas con la ayuda de controladores en tiempo real.Objetivo− Evaluar la respuesta en corriente alterna del convertidor buck controlado con la técnica ZAD-FPIC.Metodología− Se parte de las ecuaciones diferenciales que describen el convertidor de potencia buck, luego se diseñan los controladores ZAD y FPIC, se hacen simu-laciones del sistema completo controlado en Simulink de Matlab, se implementa el sistema de forma experimental y el controlador se ejecuta en tiempo real con la ayuda de una DS1104 de la empresa dSPACE, al final se realizan varias pruebas para comprobar la efectividad del controlador.Resultados− Los resultados muestran que el controlador permite que una buena estabilidad contra diversas varia-ciones en el sistema y en la carga.Conclusiones− La técnica ZAD-FPIC controla la varia-ble y realiza seguimiento ante cambios en la forma de onda, magnitud y frecuencia de la señal de referencia. El controlador presenta buena estabilidad ante diferentes pruebas, siguiendo la señal de referencia después de cada event
Maxillary sinus augmentation with three different biomaterials: Histological, histomorphometric, clinical, and patient-reported outcomes from a randomized controlled trial
Background: Lateral maxillary sinus augmentation (MSA) is a predictable bone regeneration technique in case of atrophy of the posterior-upper maxilla. Aimed at obtaining quantity and quality of bone suitable for receiving osseointegrated implants, its success is largely due to the skill of the surgeon, but also to the characteristics of the biomaterial used. Methods: Twenty-four patients needing MSA were included in the study. The patients were randomly allocated to three different groups: anorganic bovine bone mineral as control, tricalcium phosphate with or without hyaluronic acid (HA) as test groups. Nine months after MSA, bone biopsies were harvested for the histomorphometric analysis. Secondary outcomes were mean bone gain, intraoperative and postoperative complications, implant insertion torque, implant failure, and patient-reported outcome measures. Results: Although the percentage of new bone was not statistically different between the three groups (P =.191), the percentages of residual biomaterial was significantly higher (P <.000) and nonmineralized tissue significantly lower (P <.000) in the control than in the test groups. Test groups did not differ significantly from each other for all histomorphometric parameters. The implant insertion torque was significantly higher in the control group (P <.0005). The rest of the secondary outcomes were not significantly different between the groups. Conclusion: MSA is a safe and predictable procedure in terms of histological, clinical, and PROAMs, regardless of the biomaterial used. The addition of HA did not influence the outcomes
Tratamento com implantes dentários pós-extração.
Introduction: The aim of the present study was to show the results of treatment with dental implants inserted immediately after extraction.
Methods: 22 patients with unitary, partial or total tooth loss were treated with 82 Microdent ® implants with etched and acid-etched surfaces. All implants were inserted immediately after the corresponding extraction. The implants were loaded after a healing period of 3 months in the mandible or 6 months in the upper mandible.
Results: Clinical findings indicate survival and implant success of 97.6%. 2 implants were lost during the healing period. 73.2% of the implants were inserted in the maxilla, while 26.8% in the mandible. After an average functional load period of 12 months, there were no late complications.
Conclusions: This study indicates that dental implants inserted immediately after extraction can be a predictable and successful alternative to the implant.
Introdução: O objetivo do presente estudo foi mostrar os resultados do tratamento com implantes dentários inseridos imediatamente após a extração.
Métodos: 22 pacientes com perda dentária unitária, parcial ou total foram tratados com 82 implantes Microdent ® com superfície tratada com ácidos. Todos os implantes foram inseridos imediatamente após a extração correspondente. Os implantes foram carregados após um período de cicatrização de 3 meses na mandíbula ou 6 meses na maxila.
Resultados: Os achados clínicos indicam sobrevivência e sucesso dos implantes de 97,6%. 2 implantes foram perdidos durante o período de cicatrização. 73,2% dos implantes foram inseridos na maxila, enquanto 26,8% na mandíbula. Após um período médio de carga funcional de 12 meses, não houve complicações tardias.
Conclusões: Este estudo indica que implantes dentários inseridos imediatamente após a extração podem ser uma alternativa previsível e bem-sucedida ao implante
Unified Ontology for a Holonic Manufacturing System
[ES] Los sistemas holónicos de manufactura son integrados por holones capaces de comportarse de una manera autónoma, cooperativa, auto-organizada y reconfigurable para adoptar estructuras distintas en condiciones de operación normales y de emergencia. Dichos holones cuentan con: (1) una representación del conocimiento, (2) una unidad de control distribuido y descentralizado, y (3) un módulo de coordinación. El objeto de interés de la presente investigación es la concepción de una ontología unificada en el dominio de manufactura, que garantice los requisitos en el formalismo del modelo de conocimiento de un sistema holónico. A diferencia de los modelos ontológicos encontrados en la literatura, el esquema de representación del conocimiento propuesto integra roles y comportamientos, mismos que son validados mediante un caso de estudio de una celda de manufactura de un laboratorio universitario. Los resultados muestran que al hacer uso de un vocabulario común, es posible representar coherentemente el conocimiento para que toda clase de holones en una holarquía puedan intercambiar, compartir y recuperar información.[EN] Holonic manufacturing systems are formed by holons that are capable of behaving in an autonomous, cooperative, selforganized and reconfigurable way to adopt dierent structures under normal and emergency operating conditions. These holons possess: (1) a representation of the world in which they live, (2) a distributed and decentralized control unit, and (3) a coordination module. The object of interest of the present research is the conception of a unified ontology in manufacturing domain, that guarantees the requirements in the formalism of the knowledge model of a holonic system. Unlike the ontological models found in the literature, the proposed knowledge representation scheme integrates roles and behaviors, which are validated through a case study of a manufacturing cell from a university laboratory. The results show that by using a common vocabulary, it is possible to represent knowledge coherently so that all kinds of holons in a holarchy can exchange, share and retrieve information. Simón-Marmolejo, I.; López-Ortega, O.; Ramos-Velasco, LE.; Ortiz-Domínguez, M. (2018). Ontología Unificada para un Sistema Holónico de Manufactura. Revista Iberoamericana de Automática e Informática industrial. 15(2):217-230. https://doi.org/10.4995/riai.2017.8851OJS217230152Araúzoa, J. A., del Olmo-Martínez, R., Laviós, J. J., de Benito-Martín, J. J., 2015. Programación y control de sistemas de fabricación flexibles: un enfoque holónico. 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Relationship between periodontal and endodontic diseases and systemic health: correlation does not imply causation.
Fault diagnosis in industrial process by using LSTM and an elastic net
[EN] Fault diagnosis is important for industrial processes because it permits to determine the necessity of emergency stops in a process and/or to propose a maintenance plan. Two strategies for fault diagnosis are compared in this work. On the one hand, the data are preprocessed using the independent components analysis for dimension reduction, then the wavelet transform is used in order to highlight the faulty signals, with this information an artificial neural network was fed. On the other hand, the second strategy, the main contribution of this work, is the implementation of a long short term memory. This memory is fed with the most representative variables selected by an elastic net to use both, the L1 and L2 norms. These strategies are applied in the Tennessee Eastman process, a benchmark widely used for fault diagnosis. The fault isolation had better results than those reported in the literature.[ES] El diagnóstico de fallas es importante en los procesos industriales, ya que permite determinar si es necesario detener el proceso en operación y/o proponer un plan de mantenimiento. En el presente trabajo se comparan dos estrategias para diagnosticar fallas. La primera realiza un preprocesamiento de datos usando el análisis de componentes independientes para reducir la dimensión de los datos, posteriormente, se emplea la transformada wavelet para resaltar las señales de falla, con esta información se alimenta una red neuronal artificial. Por su parte, la segunda estrategia, principal contribución de este trabajo, usa una memoria de corto y largo plazo. Esta memoria es alimentada por las variables más significativas seleccionadas mediante una red elástica para usar tanto la norma como la . Como ejemplo de aplicación se utilizó el proceso químico Tennessee Eastman, un proceso ampliamente usado en el diagnóstico de fallas. El aislamiento de fallas mostró mejores resultados con respecto a los reportados en la literatura.Márquez-Vera, MA.; López-Ortega, O.; Ramos-Velasco, LE.; Ortega-Mendoza, RM.; Fernández-Neri, BJ.; Zúñiga-Peña, NS. (2021). Diagnóstico de fallas mediante una LSTM y una red elástica. Revista Iberoamericana de Automática e Informática industrial. 18(2):164-175. https://doi.org/10.4995/riai.2020.13611OJS164175182Adewole, A., Tzoneva, R., Behardien, S., 2016. Distribution network fault section identification and fault location using wavelet entropy and neural networks. Applied Soft Computing 46, 296-306. https://doi.org/10.1016/j.asoc.2016.05.013Alkaya, A., Eker, I., 2011. Variance sensitive adaptive threshold-based PCA method for fault detection with experimental application. 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Ayotzinapa y la crisis del estado neoliberal mexicano
¿Qué pasó en Ayotzinapa? Es la pregunta que surgió el 26 de septiembre de 2014, que no encuentra una respuesta satisfactoria pese a la intervención de actores de distintas instancias, niveles y nacionalidades, y al esbozo de múltiples hipótesis sobre los enfrentamientos registrados en Iguala, Guerrero, que derivaron en la muerte de varias personas y la desaparición de 43 estudiantes de la Normal Rural “Isidro Burgos”, en una tragedia que evidenció la crisis que atraviesa el estado mexicano y que afecta a todo el país.
A partir de lo acontecido en Ayotzinapa y con base en la teoría general de los campos de Pierre Bourdieu y su propuesta de análisis teórico metodológico sobre el estado, en esta obra se realiza un análisis de la práctica sistemática y generalizada de las desapariciones forzadas en México, con el fin de ofrecer otra manera de comprender el entretejido político–económico–social que hace posible este grave fenómeno, que desgarra tanto a familias como a la comunidad.
La herida abierta por Ayotzinapa sangra y el objetivo último de este libro es contribuir a evitar que se cierre en tanto no se responda la interrogante de qué pasó ahí y que crímenes de lesa humanidad como este sigan aconteciendo en México.ITESO, A.C
Role of two Triatoma (Hemiptera: Reduviidae: Triatominae) species in the transmission of Trypanosoma cruzi (Kinetoplastida: Trypanosomatidae) to man in the West Coast of Mexico
Bruxism and psychotropic medications
This is an accepted manuscript of an article published by Wiley in Progress in Neurology and Psychiatry on 13/02/2020, available online: https://wchh.onlinelibrary.wiley.com/doi/10.1002/pnp.560
The accepted version of the publication may differ from the final published version.Mental Health Disorders including schizophrenia, bipolar and schizoaffective disorders are often treated using psychotropic medications with evidence that some of these medications such as antipsychotics could be associated with significant oral side-effects. In this comprehensive review, we examine the psychotropic medications mechanisms of action and their oral side-effects, with specific focus on psychotropic medications and bruxism as a major oral health complication with a negative impact on the quality of life of mental health sufferers, relevant to psychiatrists, dentists and general practitioners. Bruxism could be caused by the antipsychotics extrapyramidal side-effects through dopaminergic receptors. Bruxism as a side-effect of psychotropic medications could result in significant consequences to oral health such as tooth structure destruction and irreversible harm to the temporomandibular joint. The review findings could assist in understanding the aetiology of bruxism, establish appropriate management plan, while supporting psychiatrists and dentists to detect temporomandibular dysfunctions (TMD) such as bruxism
Specification of Drosophila Corpora Cardiaca Neuroendocrine Cells from Mesoderm Is Regulated by Notch Signaling
Drosophila neuroendocrine cells comprising the corpora cardiaca (CC) are essential for systemic glucose regulation and represent functional orthologues of vertebrate pancreatic α-cells. Although Drosophila CC cells have been regarded as developmental orthologues of pituitary gland, the genetic regulation of CC development is poorly understood. From a genetic screen, we identified multiple novel regulators of CC development, including Notch signaling factors. Our studies demonstrate that the disruption of Notch signaling can lead to the expansion of CC cells. Live imaging demonstrates localized emergence of extra precursor cells as the basis of CC expansion in Notch mutants. Contrary to a recent report, we unexpectedly found that CC cells originate from head mesoderm. We show that Tinman expression in head mesoderm is regulated by Notch signaling and that the combination of Daughterless and Tinman is sufficient for ectopic CC specification in mesoderm. Understanding the cellular, genetic, signaling, and transcriptional basis of CC cell specification and expansion should accelerate discovery of molecular mechanisms regulating ontogeny of organs that control metabolism
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