Estudio de eficiencia energética en arranques de motores trifásicos de 1hp para sistemas de bombeo

This thesis performs the analysis of the energy efficiency in starts of 1 HP three-phase motors for a pumping system, since by making an erroneous start there is excessive energy consumption and constructive and operational damage to the motor, with the help of the analyzer. Fluke 435 which was connected to the power lines to obtain the initial data on the operation of the motor. The starts were star, direct delta and controlled by an INVT brand frequency shifter, which after the analysis it was observed that the direct star start is the best because it does not present a very high current peak and because it reaches its stability in a few seconds since with the use of the variator there were several problems such as harmonic distortion in the network, which affected the motor's operating cycle, the operation data was collected during 60 seconds of motor operation at 10-second intervals. Through these analyzes, the different types of starts and their applications were demonstrated since induction motors are used in different applications such as pumps, conveyor belts and to obtain greater efficiency and better use of electrical energy, the study of starts was carried out. common with its different electrical variables, it is important to verify that the motor control circuits have the appropriate technical characteristics and protections according to the type of connection for the use of the instrument that takes the data for analysis, the user manual should be reviewed for the correct connection and to avoid problems with the equipment, since with this the data required by the user will be obtained.La presente tesis realiza el análisis de la eficiencia energética en arranques de motores trifásicos de 1 HP para un sistema de bombeo, ya que por realizar un arranque erróneo existe un consumo excesivo de energía y daños constructivos y operativos del motor, con la ayuda del analizador Fluke 435 el cual fue conectado en las líneas de alimentación para obtener los datos iníciales en la operación del motor. Los arranques fueron estrella, delta directos y controlados por un virador de frecuencia marca INVT, lo cual después del análisis se observó que el arranque de estrella directo es el mejor por no presentar un pico de corriente muy elevado y por llegar a su estabilidad en pocos segundos ya que con el uso del variador se presentó varios problemas como distorsión armónica en la red lo cual afecto en ciclo del funcionamiento del motor, los datos de operación fueron recolectados durante 60 segundos de operación del motor en intervalos de 10 segundos. Mediante estos análisis se demostró los distintos tipos de arranques y sus aplicaciones ya que los motores de inducción se los utilizan en diferentes aplicaciones como bombas, bandas transportadoras y para obtener una mayor eficiencia y mejor aprovechamiento de la energía eléctrica se realizó el estudio de los arranques comunes con sus distintas variables eléctricas, es importante verificar que los circuitos de control del motor cuenten con las características técnicas adecuadas y protecciones de acuerdo al tipo de conexión para la utilización del instrumentó que toma los datos para el análisis se deberá revisar el manual de utilización para la correcta conexión y evitar problemas el equipo ya que con esto se obtendrá los datos que requiere el usuario

LUMBAR DISK HERNIATION: EVALUATION OF MEDICAL CARE AND PAIN MANAGEMENT AT THE SPECIALTIES HOSPITAL CREHVITAL AMBATO-ECUADOR: RETROSPECTIVE, CROSS-SECTIONAL STUDY, AND ASSESSMENT OF TWO CLINICAL CASES

Objectives: The objective of the study was to assess medical care and pain management of 237 lumbar disk herniation cases treated from 2011 to 2021 in the Specialties Hospital CREHVITAL, Ambato-Ecuador, and to provide a set of standards for appropriate management. Methods: Retrospective, cross-sectional analysis of archives, and registries of patient’s data provided by the Specialties Hospital CREHVITAL, Ambato-Ecuador. Participants: A total of 237 patients with lumbar disk herniation received medical services from 2011 to 2021; outcome measures were: Pain management, patient characteristics, surgical procedures, and medication after surgery. Results: The 40–50 age range had the highest prevalence of lumbar disk herniation and a higher percentage of the pathology in men (66%) than in women. Of the 237 patients, magnetic resonance imaging (MRI) showed the highest lumbar disk herniation of the L4–L5 (101 men and 20 women), followed by herniation of the L5–S1 (59 men and 51 women). Two types of surgeries were performed: Classical surgery on 157 patients and microsurgery on 80 patients. The average period before receiving treatment was 1.5 years of maintaining back pain, and the early post-operative management consisted of patients receiving diclofenac, ketorolac, and ceftriaxone. Analgesics were used in 73.43% of patients. All cases required strict control, follow-up, and post-operative check-ups. Conclusion: This study provides essential and conclusive evidence and information on treated cases of lumbar disk herniation and its incidence in the medical field

Efficacy and safety of the metformin-mazindol anorectic combination in rat

The current study investigates the anorectic interaction and safety of the mazindol-metformin combination in rats. Isobologram and interaction index were used to determine anorectic interaction between mazindol and metformin in the sweetened milk model. The safety profile of the mazindol-metformin combination was determined by measuring anxiety, blood pressure, hematic biometry and blood chemistry. An acute dose of mazindol and metformin administered per os, individually or as a mixture, has reduced the milk consumption in rats in a dose-dependent manner. Theoretical effective dose 40 (ED40t) did not differ from the experimental effective dose 40 (ED40e) obtained with the mazindol-metformin mixture in the anorexia experiments, by Student´s t-test. In addition, the interaction index confirmed the additive anorectic effect between both drugs. A single oral dose of ED40e mazindol-metformin mixture induced anxiolysis in the elevated plus-maze test. Moreover, oral administration of mazindol-metformin combination for 3 months significantly decreased glycemia, but not blood pressure nor other parameters of hematic biometry and blood chemistry. Results suggest that mazindol-metformin combination exerts an additive anorectic effect, as well as anxiolytic and hypoglycemic properties. Mazindol-metformin combination might be useful in obese patients with anxiety disorders or diabetes risk factors

Gestión de conocimiento en la competitividad del sector de TI. El caso de la región Tijuana – San Diego

This article shows the role of knowledge management and some additional factors as triggers for competitive advantage in companies in the TI sector in the Tijuana - San Diego region, in the border region of Baja California and California. The knowledge management through information technologies tries to generate organizational success. The implementation of knowledge management through the development of processes and systems with these factors creates a competitive advantage. One of the limitations on competitiveness is that companies in the it sector have limited use of knowledge management, this creates disadvantages and causes lack of control of intangible assets in the organization. Project management, quality systems and process control are activities that seek continuous improvement and therefore its implementation is necessary. In this first approach, knowledge management and competitiveness are considered, and it is also proposed to continue the study to corroborate this relevance.Este artículo muestra el rol de la gestión de conocimiento y de algunos factores adicionales como detonadores de la ventaja competitiva en empresas del sector de ti en la región Tijuana– San Diego, en la zona fronteriza de Baja California y California. La gestión del conocimiento mediante tecnologías de la información intenta generar el éxito organizacional. La implementación de la gestión del conocimiento mediante el desarrollo de procesos y sistemas con estos factores crea una ventaja competitiva. Una de las limitantes sobre la competitividad es que las empresas del sector de ti tienen uso limitado de la gestión del conocimiento, lo que genera desventajas y provoca falta de control de los activos intangibles en la organización. La administración de proyectos, los sistemas de calidad y el control de procesos son actividades que buscan la mejora continua y, por consiguiente, es necesaria su implementación. En esta primera aproximación, se consideran la gestión del conocimiento y la competitividad; además, se propone continuar el estudio para corroborar esta relevancia

Gestión de conocimiento en la competitividad del sector de TI. El caso de la región Tijuana – San Diego

Este artículo muestra el rol de la gestión de conocimiento y de algunos factores adicionales como detonadores de la ventaja competitiva en empresas del sector de ti en la región Tijuana– San Diego, en la zona fronteriza de Baja California y California. La gestión del conocimiento mediante tecnologías de la información intenta generar el éxito organizacional. La implementación de la gestión del conocimiento mediante el desarrollo de procesos y sistemas con estos factores crea una ventaja competitiva. Una de las limitantes sobre la competitividad es que las empresas del sector de ti tienen uso limitado de la gestión del conocimiento, lo que genera desventajas y provoca falta de control de los activos intangibles en la organización. La administración de proyectos, los sistemas de calidad y el control de procesos son actividades que buscan la mejora continua y, por consiguiente, es necesaria su implementación. En esta primera aproximación, se consideran la gestión del conocimiento y la competitividad; además, se propone continuar el estudio para corroborar esta relevancia

Microsoft Kinect-based Continuous Performance Test: An Objective Attention Deficit Hyperactivity Disorder Assessment

Background: One of the major challenges in mental medical care is finding out new instruments for an accurate and objective evaluation of the attention deficit hyperactivity disorder (ADHD). Early ADHD identification, severity assessment, and prompt treatment are essential to avoid the negative effects associated with this mental condition. Objective: The aim of our study was to develop a novel ADHD assessment instrument based on Microsoft Kinect, which identifies ADHD cardinal symptoms in order to provide a more accurate evaluation. Methods: A group of 30 children, aged 8-12 years (10.3 [SD 1.4]; male 70% [21/30]), who were referred to the Child and Adolescent Psychiatry Unit of the Department of Psychiatry at Fundación Jiménez Díaz Hospital (Madrid, Spain), were included in this study. Children were required to meet the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) criteria of ADHD diagnosis. One of the parents or guardians of the children filled the Spanish version of the Strengths and Weaknesses of ADHD Symptoms and Normal Behavior (SWAN) rating scale used in clinical practice. Each child conducted a Kinect-based continuous performance test (CPT) in which the reaction time (RT), the commission errors, and the time required to complete the reaction (CT) were calculated. The correlations of the 3 predictors, obtained using Kinect methodology, with respect to the scores of the SWAN scale were calculated. Results: The RT achieved a correlation of -.11, -.29, and -.37 with respect to the inattention, hyperactivity, and impulsivity factors of the SWAN scale. The correlations of the commission error with respect to these 3 factors were -.03, .01, and .24, respectively. Conclusions: Our findings show a relation between the Microsoft Kinect-based version of the CPT and ADHD symptomatology assessed through parental report. Results point out the importance of future research on the development of objective measures for the diagnosis of ADHD among children and adolescents.We would like to thank the Instituto de Salud Carlos III, cofounded by Fondo Europeo de Desarrollo Regional - FEDER (PI13/02200 grant)

Long COVID at different altitudes: A Countrywide Epidemiological Analysis

Background: Several reports from around the world have reported that some patients who have recovered from COVID-19 have experienced a range of persistent or new clinical symptoms after a SARS-CoV-2 infection. These symptoms can last from weeks to months, impacting everyday functioning to a significant number of patients. Methods: A cross-sectional analysis based on an online, self-reporting questionnaire was conducted in Ecuador from April to July 2022. Participants were invited by social media, radio, and TV to voluntarily participate in our study. A total of 2103 surveys were included in this study. We compared socio-demographic variables and long-term persisting symptoms at low (2500 m). Results: Overall, 1100 (52.3%) responders claimed to have Long-COVID symptoms after SARS-CoV-2 infection. Most of these were reported by women (64.0%); the most affected group was young adults between 21 to 40 years (68.5%), and most long-haulers were mestizos (91.6%). We found that high altitude residents were more likely to report persisting symptoms (71.7%) versus those living at lower altitudes (29.3%). The most common symptoms were fatigue or tiredness (8.4%), hair loss (5.1%) and difficulty concentrating (5.0%). The highest proportion of symptoms was observed in the group that received less than 2 doses. Conclusions: This is the first study describing post-COVID symptoms' persistence in low and high-altitude residents. Our findings demonstrate that women, especially those aging between 21-40, are more likely to describe Long-COVID. We also found that living at a high altitude was associated with higher reports of mood changes, tachycardia, decreased libido, insomnia, and palpitations compared to lowlanders. Finally, we found a greater risk to report Long-COVID symptoms among women, those with previous comorbidities and those who had a severer acute SARS-CoV-2 infection

Los efectos de la toma de riesgos en el desempeño financiero de empresas en la industria manufacturera del Perú: el rol mediador de la innovación

Esta investigación busca probar si la innovación media la relación entre la toma de riesgos (risk taking) y el desempeño financiero. Se espera que la innovación pueda permitir a una empresa explorar nuevas ideas y tecnologías, lo que le permita desarrollar productos y procesos innovadores, abordar nuevos mercados, aumentar la satisfacción de los clientes y obtener una ventaja competitiva; mejorar la eficiencia de los procesos y reducir los costos de producción; y aumentar su valor a largo plazo al proporcionar una base sólida para un crecimiento sostenible empresarial. La investigación se realizará mediante el uso de encuestas a empresas de la industria manufacturera y se utilizará un modelo en el cual se realizan regresiones econométricas para evaluar las hipótesis, para luego contrastarse con una estimación cuantitativa de los efectos indirectos asociados a la innovación de productos y procesos. El presente estudio serviría entonces de soporte para complementar los resultados no concluyentes de la literatura desarrollada sobre la relación entre toma de riesgos y desempeño financiero

Sustainability

Mihouse es una solución dinámica y sostenible para las condiciones reales del barrio en Cali, Colombia, con posibilidades de adaptarse a cualquier lugar. El objetivo principal del equipo es ofrecer un barrio innovador con condiciones de alta asequibilidad a través de una alta densidad de 128 unidades de vivienda que pueden expandirse pronto con fines productivos. Su diseño incluye un generoso entorno verde que ofrece una unidad habitacional confortable, flexible, progresiva y productiva a lo largo del tiempo. Teniendo en cuenta los principios de sostenibilidad, se ha diseñado un plan de gestión integral del agua diseñado un plan de gestión integrada del agua, en el que la recogida de agua de lluvia permite consumir menos agua potable y reutilizarla para la limpieza de los baños, entre otras cosas. Para la gestión integral de los residuos sólidos, se propone la creación de una pequeña empresa que gestione los residuos de la comunidad. Además, Mihouse aprovecha el Sol como fuente de energía gratuita mediante un sistema solar fotovoltaico conectado a la red con capacidad de almacenamiento, que producirá y utilizará su propia energía eléctrica además de poder vender el exceso de energía captada a la red, haciendo el sistema sostenible en el tiempoMihouse is a dynamic and sustainable solution for real neighborhood conditions in Cali, Colombia, with possibilities to be adapted anywhere. The team’s main goal is to offer an innovative neighborhood with high affordability conditions through a high density of 128 living units that can expand soon for productive purposes. Its design includes a generous green environment offering a comfortable living unit, flexible, progressive and productive along the time Considering sustainable principles, an integrated water management plan has been designed, in which rainwater harvesting allows us to consume less potable water and reusing it for cleaning bathrooms among others. For the integrated solid waste management, the creation of a small company to manage the community’s residues is proposed. Furthermore, Mihouse takes advantage of the Sun as a free energy source using a solar photovoltaic gridconnected system with storage capacity, that will produce and use its own electrical energy as well as being able to sell the excess of captured energy to the grid, making the system sustainable during the time.Primera edició

Assessment of platelet REACtivity after transcatheter aortic valve replacement

OBJECTIVES: The REAC-TAVI (Assessment of platelet REACtivity after Transcatheter Aortic Valve Implantation) trial enrolled patients with aortic stenosis (AS) undergoing transcatheter aortic valve replacement (TAVR) pre-treated with aspirin + clopidogrel, aimed to compare the efficacy of clopidogrel and ticagrelor in suppressing high platelet reactivity (HPR) after TAVI. BACKGROUND: Current recommendations support short-term use of aspirin + clopidogrel for patients with severe AS undergoing TAVR despite the lack of compelling evidence. METHODS: This was a prospective, randomized, multicenter investigation. Platelet reactivity was measured at 6 different time points with the VerifyNow assay (Accriva Diagnostics, San Diego, California). HPR was defined as (P2Y12 reaction units (PRU) ≥208. Patients with HPR before TAVR were randomized to either aspirin + ticagrelor or aspirin + clopidogrel for 3 months. Patients without HPR continued with aspirin + clopidogrel (registry cohort). The primary endpoint was non-HPR status (PRU <208) in ≥70% of patients treated with ticagrelor at 90 days post-TAVR. RESULTS: A total of 68 patients were included. Of these, 48 (71%) had HPR (PRU 273 ± 09) and were randomized to aspirin + ticagrelor (n = 24, PRU 277 ± 08) or continued with aspirin + clopidogrel (n = 24, PRU 269 ± 49). The remaining 20 patients (29%) without HPR (PRU 133 ± 12) were included in the registry. Overall, platelet reactivity across all the study time points after TAVR was lower in patients randomized to ticagrelor compared with those treated with clopidogrel, including those enrolled in the registry (p < 0.001). The primary endpoint was achieved in 100% of patients with ticagrelor compared with 21% with clopidogrel (p < 0.001). Interestingly, 33% of clopidogrel responder patients at baseline developed HPR status during the first month after TAVR. CONCLUSIONS: HPR to clopidogrel is present in a considerable number of patients with AS undergoing TAVR. Ticagrelor achieves a better and faster effect, providing sustained suppression of HPR to these patients. (Platelet Reactivity After TAVI: A Multicenter Pilot Study [REAC-TAVI]; NCT02224066)