Estudio de cargabilidad de transformadores en el alimentador 52c8l4 subestación el calvario “Latacunga Sur” de la Empresa Eléctrica provincial Cotopaxi S.A en base al tipo de usuario y consumo de energía

The present research was developed in a study related to the use of the charge in transformers, which determines the proper operation of the electricity distribution without inconvenient due to energy losses, taking into consideration that during the operation of equipment has to deprive or prejudice of electric power to the lower number users whit this Electric Provincial Cotopaxi S.A. Company, has begun technical studies of charge, for the purpose of study, 52C8L4 feeder was taken in order to take advantage of the charge of the transformers installed in the feeder, intends to improve the distribution of power with actual consumption data from users connected to the distribution network and measurements to the transformers, It will allow relocating transformers that overloads and loss of energy in the system, and to propose a solution in the feeder, all results will be determined using the digital modeling in the Cymdist Software....El presente trabajo de tesis se desarrolló en un estudio relacionado al aprovechamiento de la cargabilidad en los transformadores, el que determina el funcionamiento adecuado de la distribución de energía eléctrica, que no presente inconvenientes por causas de pérdidas de energía, tomando en consideración que durante la operación de dichos equipos se tenga que interrumpir el servicio de energía eléctrica al menor número de usuarios posibles, es con esto que la Empresa Eléctrica Provincial Cotopaxi S.A, ha iniciado estudios técnicos de cargabilidad. Para efecto de estudio se tomó el Alimentador 52C8L4, con el objetivo de aprovechar la cargabilidad de los transformadores instalados en el Alimentador, se pretende mejorar la distribución de energía, con datos reales del consumo de los usuarios conectados a la red de distribución y mediciones realizadas en las bajantes de los transformadores, con ello permitirá cambiar los transformadores que presenten sobrecargas y plantear soluciones en el Alimentador, la modelación digital se realizará en el Software Cymdist...

Evaluación de la actividad antimicrobiana de tres chalconas sintéticas frente a Staphylococcus aureus, Escherichia coli y Candida albicans

Las chalconas son compuestos distribuidos en la naturaleza y son precursores biosintéticos de los flavonoides. Su estructura química presenta un anillo aromático en cada extremo de una cadena de tres átomos de carbono con un sistema carbonílico α,β-insaturado, en donde los anillos pueden estar sustituidos o no por grupos hidroxilo o metoxilo, regularmente. Autores reportan la relación de las actividades biológicas con las características estructurales mencionadas o con modificaciones de ellas. En el presente trabajo se sintetizaron tres chalconas para evaluar su actividad antimicrobiana frente a Staphylococcus aureus, Escherichia coli y Candida albicans por el método de difusión en agar. Las chalconas con sustituyentes inhibieron el crecimiento de los tres microorganismos y, únicamente, la chalcona sin sustituyentes, presentó efecto fungicida. El efecto antimicrobiano de las chalconas se correlaciona con los patrones de sustitución de los anillos aromáticos.Chalcones are compounds that are distributed in nature and are flavonoid biosynthetic precursors. Its chemical structure presents an aromatic ring at each end of a chain of three carbon atoms with a α,β-unsaturated carbonyl system, where the rings may be substituted or not by hydroxyl or methoxyl groups, regularly. Authors report the relationship of biological activities with the structural characteristics mentioned or with modifications of them. In the present work three chalcones were synthesized to evaluate their antimicrobial activity against Staphylococcus aureus, Escherichia coli and Gandida albicans by the agar diffusion method. The chalcones with substituents inhibited the growth of the three microorganisms and, only, the chalcone without substituents, presented a fungicida! effect. The antimicrobial effect of the chalcones is correlated with the substitution patterns ofthe aromatic rings

Tratamiento homeopático y convencional de la urgencia hipertensiva

Introduction: arterial hypertension is a health problem with high prevalence worldwide, considered one of the main cardiovascular risk factors, being a very frequent reason for consultation, both in primary care and in emergency services. Objective: to determine the Therapeutic effectiveness of two homeopathic remedies in the treatment of Hypertensive Urgency and the comparison of these remedies. Method: quasi-experimental study of 60 patients with Hypertensive Urgency in the Emergency Department of the José Martí Cast of the "Marta Abreu" polyclinic, between January 2018 and December 2018. Patients with characteristics from the homeopathic point of view of Lachesis and Aconitum were chosen and they were also randomly divided into each of the remedies in a study group that applied the homeopathic remedy to the (200CH); 5 sublingual drops every 10 minutes and another control with Captopril (25 mg) 1 tablet in both cases the blood pressure was taken systematically. Results: the ages of 50 to 60 years and the female sex predominated, in addition in both remedies the BP was reduced fundamentally at 45 minutes in both the study group and the control group, the adverse effect in the study groups that prevailed was burning in the tongue and cough in the control groups. Conclusions: it was evidenced that the homeopathic remedies studied are effective in the Treatment of Hypertensive Urgency, lowering blood pressure as well as Captopril with minimal undesirable effects in relation to conventional treatment.Introducción: la hipertensión arterial es un problema de salud con alta prevalencia en todo el mundo, está considerada uno de los principales factores de riesgo cardiovascular y es motivo de consulta muy frecuente tanto en la atención primaria como en los servicios de urgencias. Objetivo: determinar la efectividad terapéutica de dos remedios homeopáticos en el tratamiento de la urgencia hipertensiva. Método: estudio cuasi experimental de 60 pacientes con urgencia hipertensiva que acudieron al Servicio de Urgencia del Policlínico “Marta Abreu” del Reparto “José Martí” entre enero y diciembre de 2018. Se escogieron pacientes con características desde el punto de vista homeopático de Lachesis y Aconitum, se dividieron de forma aleatoria en cada uno de los remedios en un grupo estudio al que se le aplicó el remedio homeopático a la 200 centesimal hahnemanniana: cinco gotas sublinguales cada 10 minutos y otro control con captopril (25mg), una tableta; en ambos casos se le tomó la presión arterial sistemáticamente. Resultados: predominaron las edades de 50 a 60 años y el sexo femenino, además en ambos remedios se redujo la presión arterial a los 45 minutos tanto en el grupo estudio como en el grupo control, el efecto adverso en el grupo estudio fue el ardor en la lengua y en el grupo control la tos. Conclusiones: los remedios homeopáticos estudiados son efectivos en el tratamiento de la urgencia hipertensiva y disminuyen la presión arterial tanto como el captopril, con efectos indeseables mínimos con relación al tratamiento convencional

Investigación en Matemáticas, Economía, Ciencias Sociales y Agronomía

Cada trabajo del libro incluye conclusiones para los interesados en las temáticas aludidas y en ellos nos enteramos de aspectos como los siguientes: - El mayor incremento del precio de los insumos como el maíz, sorgo y en menor medida desperdicio de pan, en relación con el menor crecimiento del precio del ganado en pie, dará como consecuencia un desabasto de carne bovina. - El agua es un recurso primordial en las zonas áridas y semiáridas de México, en tanto que su aporte limita la producción de la agricultura. En este estudio se observó que el precio real del agua es muy bajo en relación a otras zonas agrícolas del mundo. - Hoy en día en el país se consumen alrededor de 718 mil barriles diarios de gasolinas, un aproximado de 113.7 millones de litros, una cantidad tan grande que nuestro país se ve en la necesidad de importar cerca del 39 % de las gasolinas que consumimos. - Los jaliscienses radicados en Estados Unidos tienen una mayor capacidad de financiamiento del bienestar en la entidad, que el propio gobierno de ese estado. - México continuará basando sus finanzas públicas y su política de desarrollo económico en la extracción de combustibles fósiles (petróleo). Este modelo acelerará el deterioro y agotamiento de los recursos naturales. -La importancia de la agricultura orgánica radica en que retoma los tres ámbitos de la sustentabilidad; el ámbito ambiental, el económico y el social. - Es fundamental motivar la organización de los productores de haba para que ellos puedan captar una mayor proporción de los altos márgenes de precios que los consumidores están dispuestos a pagar. - Las condiciones del clima afectan a la producción agraria. Debido al fenómeno de cambio climático, es necesario contar con herramientas informáticas que proporcionen información climatológica para poder tomar medidas preventivas a favor de una mayor cantidad y calidad de producción. La herramienta de software permite la consulta del clima por localidades evitando la necesidad de contar con una estación meteorológica

Optimasi Portofolio Resiko Menggunakan Model Markowitz MVO Dikaitkan dengan Keterbatasan Manusia dalam Memprediksi Masa Depan dalam Perspektif Al-Qur`an

Risk portfolio on modern finance has become increasingly technical, requiring the use of sophisticated mathematical tools in both research and practice. Since companies cannot insure themselves completely against risk, as human incompetence in predicting the future precisely that written in Al-Quran surah Luqman verse 34, they have to manage it to yield an optimal portfolio. The objective here is to minimize the variance among all portfolios, or alternatively, to maximize expected return among all portfolios that has at least a certain expected return. Furthermore, this study focuses on optimizing risk portfolio so called Markowitz MVO (Mean-Variance Optimization). Some theoretical frameworks for analysis are arithmetic mean, geometric mean, variance, covariance, linear programming, and quadratic programming. Moreover, finding a minimum variance portfolio produces a convex quadratic programming, that is minimizing the objective function ðð¥with constraintsð ð 𥠥 ðandð´ð¥ = ð. The outcome of this research is the solution of optimal risk portofolio in some investments that could be finished smoothly using MATLAB R2007b software together with its graphic analysis

Differential cross section measurements for the production of a W boson in association with jets in proton–proton collisions at √s = 7 TeV

Measurements are reported of differential cross sections for the production of a W boson, which decays into a muon and a neutrino, in association with jets, as a function of several variables, including the transverse momenta (pT) and pseudorapidities of the four leading jets, the scalar sum of jet transverse momenta (HT), and the difference in azimuthal angle between the directions of each jet and the muon. The data sample of pp collisions at a centre-of-mass energy of 7 TeV was collected with the CMS detector at the LHC and corresponds to an integrated luminosity of 5.0 fb[superscript −1]. The measured cross sections are compared to predictions from Monte Carlo generators, MadGraph + pythia and sherpa, and to next-to-leading-order calculations from BlackHat + sherpa. The differential cross sections are found to be in agreement with the predictions, apart from the pT distributions of the leading jets at high pT values, the distributions of the HT at high-HT and low jet multiplicity, and the distribution of the difference in azimuthal angle between the leading jet and the muon at low values.United States. Dept. of EnergyNational Science Foundation (U.S.)Alfred P. Sloan Foundatio

Impacts of the Tropical Pacific/Indian Oceans on the Seasonal Cycle of the West African Monsoon

The current consensus is that drought has developed in the Sahel during the second half of the twentieth century as a result of remote effects of oceanic anomalies amplified by local land–atmosphere interactions. This paper focuses on the impacts of oceanic anomalies upon West African climate and specifically aims to identify those from SST anomalies in the Pacific/Indian Oceans during spring and summer seasons, when they were significant. Idealized sensitivity experiments are performed with four atmospheric general circulation models (AGCMs). The prescribed SST patterns used in the AGCMs are based on the leading mode of covariability between SST anomalies over the Pacific/Indian Oceans and summer rainfall over West Africa. The results show that such oceanic anomalies in the Pacific/Indian Ocean lead to a northward shift of an anomalous dry belt from the Gulf of Guinea to the Sahel as the season advances. In the Sahel, the magnitude of rainfall anomalies is comparable to that obtained by other authors using SST anomalies confined to the proximity of the Atlantic Ocean. The mechanism connecting the Pacific/Indian SST anomalies with West African rainfall has a strong seasonal cycle. In spring (May and June), anomalous subsidence develops over both the Maritime Continent and the equatorial Atlantic in response to the enhanced equatorial heating. Precipitation increases over continental West Africa in association with stronger zonal convergence of moisture. In addition, precipitation decreases over the Gulf of Guinea. During the monsoon peak (July and August), the SST anomalies move westward over the equatorial Pacific and the two regions where subsidence occurred earlier in the seasons merge over West Africa. The monsoon weakens and rainfall decreases over the Sahel, especially in August.Peer reviewe

Search for heavy resonances decaying to two Higgs bosons in final states containing four b quarks

A search is presented for narrow heavy resonances X decaying into pairs of Higgs bosons (H) in proton-proton collisions collected by the CMS experiment at the LHC at root s = 8 TeV. The data correspond to an integrated luminosity of 19.7 fb(-1). The search considers HH resonances with masses between 1 and 3 TeV, having final states of two b quark pairs. Each Higgs boson is produced with large momentum, and the hadronization products of the pair of b quarks can usually be reconstructed as single large jets. The background from multijet and t (t) over bar events is significantly reduced by applying requirements related to the flavor of the jet, its mass, and its substructure. The signal would be identified as a peak on top of the dijet invariant mass spectrum of the remaining background events. No evidence is observed for such a signal. Upper limits obtained at 95 confidence level for the product of the production cross section and branching fraction sigma(gg -> X) B(X -> HH -> b (b) over barb (b) over bar) range from 10 to 1.5 fb for the mass of X from 1.15 to 2.0 TeV, significantly extending previous searches. For a warped extra dimension theory with amass scale Lambda(R) = 1 TeV, the data exclude radion scalar masses between 1.15 and 1.55 TeV

Measurement of the top quark forward-backward production asymmetry and the anomalous chromoelectric and chromomagnetic moments in pp collisions at √s = 13 TeV

Abstract The parton-level top quark (t) forward-backward asymmetry and the anomalous chromoelectric (d̂ t) and chromomagnetic (μ̂ t) moments have been measured using LHC pp collisions at a center-of-mass energy of 13 TeV, collected in the CMS detector in a data sample corresponding to an integrated luminosity of 35.9 fb−1. The linearized variable AFB(1) is used to approximate the asymmetry. Candidate t t ¯ events decaying to a muon or electron and jets in final states with low and high Lorentz boosts are selected and reconstructed using a fit of the kinematic distributions of the decay products to those expected for t t ¯ final states. The values found for the parameters are AFB(1)=0.048−0.087+0.095(stat)−0.029+0.020(syst),μ̂t=−0.024−0.009+0.013(stat)−0.011+0.016(syst), and a limit is placed on the magnitude of | d̂ t| < 0.03 at 95% confidence level. [Figure not available: see fulltext.