Suppressing chaos in damped driven systems by non-harmonic excitations: experimental robustness against potential’s mismatches

The robustness of a chaos-suppressing scenario against potential mismatches is experimentally studied through the universal model of a damped, harmonically driven two-well Duffing oscillator subject to non-harmonic chaos-suppressing excitations. We consider a second order analogous electrical circuit having an extremely simple two-well potential that differs from that of the standard two-well Duffing model, and compare the main theoretical predictions regarding the chaos-suppressing scenario from the latter with experimental results from the former. Our experimental results prove the high robustness of the chaos-suppressing scenario against potential mismatches regardless of the (constant) values of the remaining parameters. Specifically, the predictions of an inverse dependence of the regularization area in the control parameter plane on the impulse of the chaos-suppressing excitation as well as of a minimal effective amplitude of the chaos-suppressing excitation when the impulse transmitted is maximum were experimentally confirmed.Ministerio de Ciencia, Innovación y Universidades (MICIU, Spain) and FEDER funds Project No. PID2019-108508GB-100/AEI/10.13039/501100011033Junta de Extremadura (JEx, Spain) and FEDER funds Project No. GR1808

Aljibes hispano-musulmanes de la provincia de Córdoba

This project has as its aim the archaeological study of a group of Hispano- muslim water reservoirs associated with various fortresses and archaeological sites within the Province of Córdoba. These water reservoirs, underground or partly-hollowed out chambers in the ground, were among the most com- monly-used hydraulic constructions during the Middle Ages, as they allowed the collection and storage of rain water and its conservation in good condi- tions for human consumption. Those studied in our province can be divided into two groups, the first of which is made up up of a limited number of very large deposits, with various interior chambers separated by arches and columns, joined in covered spaces by way of barrel vaults, Crossing vaults or conch domes; the second group, to which the majority belongs, consists of water deposits of rectangular shape and reduced. dimensions, covered by barrel vaults, and designed to provide for the needs of small groups of people.Este proyecto tiene como objetivo el estudio arqueológico de un conjunto de embalses hispano-musulmanes asociados a diversas fortalezas y yacimientos arqueológicos de la provincia de Córdoba. Estos depósitos de agua, cámaras subterráneas o parcialmente ahuecadas en el suelo, se encontraban entre las construcciones hidráulicas más utilizadas durante la Edad Media, ya que permitían la captación y almacenamiento del agua de lluvia y su conservación en buenas condiciones para el consumo humano. Los estudiados en nuestra provincia pueden dividirse en dos grupos, el primero de los cuales está formado por un número limitado de depósitos muy grandes, con varias cámaras interiores separadas por arcos y columnas, unidas en espacios cubiertos por bóvedas de cañón, bóvedas de crucero o cúpulas de caracol; el segundo grupo, al que pertenece la mayoría, está formado por depósitos de agua de forma rectangular y de dimensiones reducidas, cubiertos por bóvedas de cañón, y diseñados para satisfacer las necesidades de pequeños grupos de personas

Alterações do uso do solo e biodiversidade em São Tomé

São Tomé é uma prioridade para a conservação da biodiversidade em termos mundiais, sobretudo por possuir um número excepcional de endemismos (variedades biológicas exclusivas). Diversas actividades humanas ameaçam este património natural único, nomeadamente através da alteração do uso do solo. No presente trabalho, identifiquei uma redução do número de espécies endémicas de aves e árvores com o aumento da intensidade do uso do solo. Uma tendência verificada em ambos os grupos analisados, embora as aves fossem mais resilientes. A subsistência das espécies endémicas de São Tomé está claramente dependente da persistência de zonas florestais bem preservadas. Como tal é urgente adoptar práticas de gestão territorial e de desenvolvimento agroflorestal que se coadunem com a sua conservação.São Tomé is a worldwide priority for biodiversity conservation, mostly due to its exceptionally high number of endemics (exclusive biological varieties). Several human activities threaten this unique natural patrimony, namely through land-use change. In this work, I identified a reduction in the number of endemic species of birds and trees with increasing land-use intensity. A trend common to both groups analysed, although birds were more resilient. The subsistence of São Tomé’s endemic species is clearly dependent on the persistence of well-preserved forest areas. Therefore it is urgent to adopt practices of land management and agroforestry development that commensurate with their conservation

Gestión administrativa y compromiso organizacional según los docentes de la IEP. José Buenaventura Sepúlveda de Cañete, 2012

La presente investigación tuvo como objetivo general, Determinar la relación que existe entre la Gestión administrativa y compromiso organizacional según los docentes de la IEP. José Buenaventura Sepúlveda de Cañete, 2012. La población es de 93 docentes, la muestra fue censal, en los cuales se han empleado la variable: Gestión administrativa y Compromiso organizacional. El método empleado en la investigación fue el hipotético-deductivo. Esta investigación utilizó para su propósito el diseño no experimental de nivel correlacional de corte transversal, que recogió la información en un período específico, que se desarrolló al aplicar los instrumentos: Cuestionario Gestión administrativa , el cual estuvo constituido por 32 preguntas en la escala de Likert (Nunca, A Veces, Siempre) y el Cuestionario en el Bases teóricas del Compromiso organizacional, el cual estuvo constituido por 27 sus respuestas están en Likert: Cuestionario-Índices, 1= Totalmente en desacuerdo, 2= En desacuerdo, 3= Casi de acuerdo, 4= De acuerdo, 5= Totalmente de acuerdo que brindaron información acerca del Gestión administrativa y el Compromiso organizacional, a través de la evaluación de sus distintas dimensiones, cuyos resultados se presentan gráfica y textualmente. La investigación concluye en que existe evidencia para afirmar que La Gestión administrativa se relaciona significativamente con el compromiso organizacional según los docentes de la IEP. José Buenaventura Sepúlveda de Cañete, 2012, siendo que el coeficiente de correlación Rho de Spearman de 0. 704, represento una alta asociación entre la variables

Analysis of the preservative treatment influence on tropical timbers surfaces color and roughness

Embora os tratamentos químicos aumentem a durabilidade da madeira, efeitos indiretos são obtidos com o emprego de alguns desses produtos, como a modificação da sua cor original e alterações em sua superfície. O objetivo do presente trabalho foi avaliar a superfície de três madeiras tropicais impregnadas com preservativo CCA por meio da colorimetria e da rugosidade. Três espécies de madeiras tropicais foram utilizadas, representando grupos de baixa, média e alta densidades. A cor de todas as madeiras foi alterada de forma significativa, ficando escuras, com diminuição dos pigmentos vermelhos e amarelos e com tendência ao esverdeamento da superfície. Com relação à rugosidade, todas as amostras apresentaram aumento da média aritmética da rugosidade (Ra) e da média da altura máxima (Rz), aumentando a aspereza da superfície.Although the chemical treatments increase wood durability, there are side effects due to the use of some products, such as the change of its original color and in its surface. The present work aimed to evaluate the surface of three tropical wood species impregnated with CCA preservative using colorimetric and roughness techniques. We used three tropical wood species representing groups of low, medium and high density. The color of the wood samples changed significantly, darkening with reduction of red and yellow pigments and a tending to surface`s greening. Regarding roughness, all samples showed an increase in the arithmetic mean roughness (Ra) and the mean maximum height (Rz), increasing surface roughness

Fonseca anamnestic index for screening temporomandibular disorders - reliability to discriminate muscular from intra-articular disorders

Background/ Objective: Fonseca anamnestic index (FAI) is a simple and quick survey used for screening the presence and severity of Temporomandibular Disorders (TMD). The presented study aimed to screen the FAI accuracy to discriminate different types of TMD: intra-articular (AD), Masticatory Muscular Disorder (MMD), or the presence of both typologies. Methods: The existence of a pattern in the FAI based on the frequency of answers was evaluated and supported by other variables: sex, age, medical diagnosis and Visual Analog Scale of health-related quality of Life (VASLife). The non-parametric Chi-square test () or Fisher's exact test were used to assess the existence of associations between these variables. In the pairs of variables where such association was identified, its intensity was measured by Cramér's V Coefficient. The prediction if FAI could be a good decision tool for distinguish the type of TMD was assessed through logistic regression models (ordinal and multinomial). Results: The higher FAI score was associated with questions related with temporomandibular joint (TMJ) pain, TMJ clicks and person anxiety. Severe cases classified by FAI are correlated with typology of Both (AD+MMD). Moreover, the female patients presented more moderate and severe cases in FAI and also correlated with the presence of AD+MMD. The logistic model showed low accuracy to distinguish the TMD typology (~70%). Conclusion: FAI is a good initial methodology in TMD diagnosis, however integrated in a logistic regression model for distinguish the typology of TMD has proved to be insufficient. It is expected that the combination of this survey with other outcomes will make the model more accurate.info:eu-repo/semantics/publishedVersio

Diseño de losa de concreto con incorporacion de viruta de acero para estacionamiento, empresa de transporte, San Antonio, Huarochiri, 2019

La presente investigación tiene como objetivo determinar las propiedades físicas que obtiene el concreto en el diseño de losa de concreto para estacionamiento mediante la incorporación de viruta de acero Bonificada, en el estacionamiento empresa de transportes San Ignacio S.A. , ubicada en el distrito de San Antonio de Jicamarca, proyectándonos en los factores de costo y tiempo en la ejecución, con la intención de obtener y demostrar las mejoras proporcionadas a través de la incorporación de la viruta de acero Bonificada en el diseño de losa en comparación a un pavimento convencional. Se realizaron los ensayos necesarios en los agregados para determinar la resistencia de un concreto patrón de 280kg/cm2 y posteriormente en un concreto incorporando viruta de acero bonificada en una dosificación de 3kg y 5kg por m3 en probetas y viguetas, se ensayaron a los 3 días, 14 días y 28 días, respectivamente, obteniendo así una comparación entre estas. Finalmente, se concluye que en una dosificación de 3kg/m3 aumenta considerablemente el comportamiento mecánico del concreto ante la resistencia a la compresión y flexión; estos factores contribuyen a la resistencia de la losa lo que a su vez influye en un menor espesor y por ende a un menor volumen de concreto a emplear en la elaboración de la misma

Impulse-induced localized control of chaos in starlike networks

Locally decreasing the impulse transmitted by periodic pulses is shown to be a reliable method of taming chaos in starlike networks of dissipative nonlinear oscillators, leading to both synchronous periodic states and equilibria (oscillation death). Specifically, the paradigmatic model of damped kicked rotators is studied in which it is assumed that when the rotators are driven synchronously, i.e., all driving pulses transmit the same impulse, the networks display chaotic dynamics. It is found that the taming effect of decreasing the impulse transmitted by the pulses acting on particular nodes strongly depends on their number and degree of connectivity. A theoretical analysis is given explaining the basic physical mechanism as well as the main features of the chaos-control scenario.Ministerio de Economía y Competitividad (MINECO, Spain) Project No. FIS2012-34902 cofinanced by FEDER fundsJunta de Extremadura (JEx, Spain) Project No. GR1514