Simple fatigue testing machine for fiber-reinforced polymer composite

Fiber-reinforced polymer (FRP) composites seem to be the best options in many structural applications. Such applications are often exposed to fatigue loads, and therefore, the fatigue behavior of the composites must be studied in order to achieve a proper design. This is fulfilled by means of an experimental characterization, in which a lot of specimens are tested because of the several parameters involved (i.e., fiber/matrix ratio, fiber orientation, staking sequence, etc.). Besides, the fatigue tests must be carried out at low frequencies, in order to avoid temperature increments in the polymer matrix, which would change the mechanical properties of the composite. Consequently, considerable time is consumed to perform a complete set of tests and, when using conventional servohydraulic testing machines, costs rise notably. A machine to perform fatigue tests of composite materials under constant amplitude load cycles and a wide range of load ratios is presented in this paper. This machine exhibits as main goals the fulfillment of the corresponding standard requirements, a very low cost compared to conventional servohydraulic testing machines and, consequently, makes reasonably priced to have several machines testing specimens simultaneously, in order to reduce the necessary time to complete the whole characterization.Fil: Pach, Esteban. Universidad Nacional del Comahue; ArgentinaFil: Korin, Ivan. Universidad Nacional del Comahue; Argentina. Universidad Nacional de San Martín; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Perez Ipiña, Juan Elias. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Comahue; Argentin

Pass-through de la tasa de cambio en el mercado de carros colombiano

El pass-through incompleto de choques de tasa de cambio a precios minoristas es un fen ́omeno bien documentado. Ante un choque de tasa de cambio, las firmas re- sponden ́optimamente ajustando sus m ́argenes e importando bienes intermedios de regiones con t ́erminos de intercambio m ́as favorables. Los consumidores, a su vez, sustituyen bienes que se encarecen por bienes relativamente m ́as baratos. Usando datos del mercado de carros nuevos en Colombia, analizamos los determi- nantes de la incompletitud del pass-through luego de una gran depreciaci ́on de la moneda local. Estimamos un modelo estructural de oligopolio que anida las reac- ciones ́optimas de firmas y consumidores para medir su capacidad de explicar la poca respuesta de los precios minoristas ante el choque de tasa de cambio. Encon- tramos que el principal factor a la hora de explicar este pass-through incompleto es la sustituci ́on de los consumidores, seguido por la interacci ́on estrat ́egica entre vendedores.The incomplete pass-through of exchange rates to prices is a well-documented phenomenon. Firms respond optimally to exchange rate shocks by adjusting margins and buying inputs from regions with more advantageous terms of trade. Consumers, in turn, substitute goods that become more expensive for relatively cheaper goods after an exchange rate shock. We use data from the market for new cars in Colombia to empirically analyze the determinants of incomplete pass- through after a large depreciation of the local currency. We estimate a structural oligopoly model that nests the optimal reactions of firms and consumers to as- sess their relative importance in explaining the lack of response of retail prices to the exchange rate shock. We find that, in relative terms, the most important factor explaining incomplete pass-through is consumer substitution, followed by strategic interaction between sellers.Exchange rate pass-through in the Colombian car market Enfoque Los precios de bienes que usan insumos importados tienden a reflejar poco los choques de tasa de cambio. Esto se denomina pass-through incompleto, y aunque es un fenómeno bien difundido, sus causas han sido poco estudiadas. Este fenómeno se origina en las decisiones de firmas y consumidores que responden a las nuevas condiciones del mercado. Hasta ahora se sabe poco sobre la importancia relativa que tienen estas decisiones para explicar el pass-through incompleto. En este documento usamos datos del mercado colombiano de carros nuevos para cuantificar las respuestas de firmas y consumidores a una depreciación del peso. Nuestra metodología nos permite ponderar el efecto de estas respuestas sobre el pass-through de la tasa de cambio a los precios minoristas de carros. Contribución Estimamos un modelo estructural de oligopolio en el que los vendedores de carros compiten fijando los precios de sus bienes diferenciados. Los consumidores de nuestro modelo escogen el carro que más utilidad les genera una vez han pagado por él. Con el modelo estimado podemos hacer experimentos que nos permiten cuantificar la importancia que tienen las distintas causas del pass-through incompleto. Por ejemplo, podemos ver cuál habría sido la respuesta de las firmas si el peso no se hubiera depreciado. También podemos ver qué habrían hecho los consumidores si el menú de carros no hubiera cambiado con la depreciación. Resultados Nuestros resultados muestran que la principal causa de la tímida respuesta de los precios a los choques de tasa de cambio es que los consumidores abandonan carros que se encarecen con la depreciación en favor de carros que se abaratan relativamente. Los vendedores de carros pueden responder al encarecimiento de sus insumos importados de dos formas: importando de países que no se encarecen tanto y bajando sus márgenes. Nuestro modelo indica que el ajuste de márgenes tiene un rol más importante. Este resultado se confirma con otro hallazgo interesante: carros con el mismo origen y la misma marca, pero de diferentes gamas, muestran distintos niveles de pass-through. Por ejemplo, carros de gama más alta, en los que los márgenes son mayores, exhiben un pass-through menor. Frase destacada: Nuestros resultados muestran que la principal causa de la tímida respuesta de los precios a los choques de tasa de cambio es que los consumidores abandonan carros que se encarecen con la depreciación en favor de carros que se abaratan relativamente

Visitor Profile Of Cuenca Religious Music Week

Religious Music Week in Cuenca is the fourth oldest music festival in Spain, involved in orchestras, choirs and performers of international stature and prestige that interpret various compositions of sacred music. Religious Music Week in Cuenca is declared a Fiesta of International Tourist Interest, since its inception in 1962, has always retained a strong personality as a result of high musical expertise; it is wonderful geographical location and the enormous wealth of heritage that surrounds it. This festival is writing a new chapter in the annals of religious music. Their long tradition has set the standard in Spain, which allows comparison with other festivals in Europe. In the present study is to characterize the profile of the visitor from the 48th through a questionnaire administered to attendees of the event, in the same show basic characteristics of visitors, taking a special interest in the economic impact is Cuenca city for the celebration of this event

Choroid Plexus Papilloma of the Fourth Ventricle: A Pediatric Patient.

Choroid plexus papilloma is a low-frequency entity in both the adult and pediatric populations. Its clinical presentation is very variable as it depends on its location and length. We must always do the differential diagnosis between papilloma and other intraventricular pathologies. This article is about a case report of a pediatric patient with a Choroid plexus papilloma located in the fourth ventricle, a location that is atypical for the pediatric population

Rehabilitación físico terapéutica comunitaria de la paraplejia; reto para un paciente con tetralogía de Fallot (Original)

This article presents the research carried out to contribute to the solution of the problem that    exists in relation to the care of a patient suffering from Tetralogy of Fallot who has not yet    undergone surgery, which is aggravated by his paraplegic condition as a result of this cardiac    complication, with such notable consequences as lack of sensation in the lower extremities and    muscle weakness. There are few known physical activity related alternatives to rehabilitate this    type of patient. In view of this situation, the authors of the work have carried out research to    answer the following problem: How to contribute to the community therapeutic physical    rehabilitation of a paraplegic patient with Tetralogy of Fallot in the North Popular Council of the    municipality of Urbano Noris? To this end, the objective has been to draw up a community    therapeutic physical exercise program to contribute to the rehabilitation of a paraplegic patient    with Tetralogy of Fallot for his return to an active social life. The selected sample coincides with    the population; He is a young adult of 34 years of age of white race, resident in the North    Popular Council of the Urbano Noris municipality, Holguín province, Cuba, who lives with a    brother, orphaned by a mother who helped him in everything, so for these and other reasons his    self-validity should be stimulated. For all these reasons, the investigation is important and    pertinent. En el presente artículo se expone las pesquisas realizadas para contribuir a la solución del    problema que existe relacionado con la atención de un paciente aquejado de Tetralogía de    Fallot que aún no ha sido intervenido quirúrgicamente, lo que se agrava con su estado    parapléjico como consecuencia de esta complicación cardíaca, con secuelas tan notables como    la falta de sensibilidad en las extremidades inferiores y la debilidad muscular. Se conocen    pocas alternativas relacionadas con la actividad física para rehabilitar este tipo de pacientes.    Ante esta situación los autores del trabajo han realizado acciones investigativas para dar    respuesta al siguiente problema: ¿Cómo contribuir a la rehabilitación físico terapéutica    comunitaria de un paciente parapléjico con Tetralogía de Fallot en el Consejo Popular Norte del    municipio Urbano Noris? Para ello se ha planteado como objetivo elaborar un programa de    ejercicios físicos terapéuticos comunitarios que contribuya a la rehabilitación de un paciente    parapléjico con Tetralogía de Fallot para su reincorporación a una vida social activa. La muestra    seleccionada coincide con la población; se trata de un adulto joven de 34 años de edad de raza    blanca, residente en el Consejo Popular Norte del municipio Urbano Noris, provincia Holguín,    Cuba, que vive con un hermano, huérfano de madre quien lo ayudaba en todo, de ahí que por    estas y otras razones se le debe estimular su autovalidismo. Por todo lo hasta aquí planteado la    investigación es importante y pertinente.&nbsp

Devenires de la Literatura y la Filosofía

Los textos aquí reunidos, que transitan de la filosofía a la literatura y viceversa, son un intento de pensar el devenir no como mero cambio, sino como un proceso inagotable que se opone al principio de no contradicción, que privilegia lo inacabado, lo indiferenciado, lo que se resiste a toda resolución permanente. Por ello mismo es también un devenir cargado de potencia, de posibilidades heterogéneas que pueden permitirnos salir de la Imagen del pensamiento y, así, pensar la diferencia.Universidad Autónoma del Estado de México y Ediciones y Gráficos Eón, S.A. de C.V

Development of a thermosensitive hydrogel based on Polaxamer 407 and gellan gum with inclusion complexes (Sulfobutylated-β-cyclodextrin-Farnesol) as a local drug delivery system

This work proposes the development of a thermosensitive local drug release system based on Polaxamer 407, also known as Pluronic® F-127 (PF-127), Gellan Gum (GG) and the inclusion complex Sulfobutylated-β-cyclodextrin (CD) with Farnesol (FOH). Rheological properties of the hydrogels and their degradation were studied. According to the rheological results, a solution of 20% w/v of PF-127 forms a strong gel with a gelling temperature of about 25 °C (storage modulus of 15,000 Pa). The addition of the GG increased the storage modulus (optimal concentration of 0.5 % w/v) twofold without modifying the gelling temperature. Moreover, including 0.5% w/v of GG also increased 6 times the degradation time of the hydrogel. Regarding the inclusion complex, the addition of free CD decreased the viscosity and the gel strength since polymer chains were included in CD cavity without affecting the gelling temperature. Contrarily, the inclusion complex CD-FOH did not significantly modify any property of the formulation because the FOH was hosted in the CD. Furthermore, a mathematical model was developed to adjust the degradation time. This model highlights that the addition of the GG decreases the number of released chains from the polymeric network (which coincides with an increase in the storage modulus) and that the free CD reduces the degradation rate, protecting the polymeric chains. Finally, FOH release was quantified with a specific device, that was designed and printed for this type of system, observing a sustainable drug release (similar to FOH aqueous solubility, 8 μM) dependent on polymer degradation

Moving forward on u-healthcare: A framework for patient-centric

Delivering remote healthcare services without deteriorating the ‘patient experience’ requires building highly usable and adaptive applications. Efficient context data collection and management make possible to infer extra knowledge on the user’s situation, making easier the design of these advanced ubiquitous applications. This contribution, part of a work in progress which aims at building an operative AmI middleware, presents a generic architecture to provide u-healthcare services, to be delivered both in mobile and home environments. In particular, we address the design of the Context Management Component (CMC), the module that takes context data from the sensing layer and performs data fusion and reasoning to build an aggregated ‘context image’. We especially explain the requirements on data modelling and the functional features that are imposed to the CMC. The resulting logical multilayered architecture -composed by acquisition and fusion, inference and reasoning levels- is detailed, and the technologies needed to develop the Context Management Component are finally specifie

El Plan Estratégico Vitivinícola 2030 en Argentina

The objective of the article is to analyze the elaboration process and the characteristics of the update to 2030 of the Argentine Wine Strategic Plan (PEVI 2030). For this, its writing methodology, the participation mechanisms developed, the actors involved, the problems it faced and its content are described. The analysis is carried out based on bibliography on strategic planning in general and for the wine sector in particular, and identifies the way in which territorial prospective was incorporated during the process. The article concludes that Argentina's PEVI 2030 is a case of planning for the development of an agro-industry that must compete in national and international markets and comply with sustainability principles. For the elaboration of the Plan, a methodology was proposed with broad participatory mechanisms that encountered obstacles due to the pandemic, due to the reluctance of some actors to be part of the process and due to the lack of a final stage of prioritization of actions. However, it was possible to build a mission and prospective vision of a decade, with objectives, strategies and strategic actions, with a national scope and for all wine-based chains and with an entity identified for its implementation.El objetivo del artículo es analizar el proceso de elaboración y las características de la actualización a 2030 del Plan Estratégico Vitivinícola de Argentina (PEVI 2030). Para ello se describen su metodología de redacción, los mecanismos de participación desarrollados, los actores involucrados, los problemas que enfrentó y su contenido. El análisis se realiza en base a bibliografía sobre planificación estratégica en general y para el sector vitivinícola en particular, e identifica la forma en que la prospectiva territorial se incorporó durante el proceso. El artículo concluye que el PEVI 2030 de Argentina es un caso de planificación para el desarrollo de una agroindustria que debe competir en mercados (nacionales e internacionales) y cumplir principios de sostenibilidad. Para la elaboración del Plan se planteó una metodología con mecanismos participativos amplios que encontraron obstáculos por la pandemia, por la reticencia de algunos actores a ser parte del proceso y por la falta de una etapa final de priorización de acciones. Sin embargo, se logró construir una misión y visión prospectiva de una década, con objetivos, estrategias y acciones estratégicas, con un alcance nacional y para todas las cadenas de base vitícola y con una entidad identificada para su implementación

A distributed topology for identifying anomalies in an industrial environment

The devastating consequences of climate change have resulted in the promotion of clean energies, being the wind energy the one with greater potential. This technology has been developed in recent years following different strategic plans, playing special attention to wind generation. In this sense, the use of bicomponent materials in wind generator blades and housings is a widely spread procedure. However, the great complexity of the process followed to obtain this kind of materials hinders the problem of detecting anomalous situations in the plant, due to sensors or actuators malfunctions. This has a direct impact on the features of the final product, with the corresponding influence in the durability and wind generator performance. In this context, the present work proposes the use of a distributed anomaly detection system to identify the source of the wrong operation. With this aim, five different one-class techniques are considered to detect deviations in three plant components located in a bicomponent mixing machine installation: the flow meter, the pressure sensor and the pump speed.CITIC, as a Research Center of the university System of Galicia, is funded by Conselleria de Education, Universidade e Formacion Profesional of the Xunta de Galicia through the European regional Development Fund (ERDF) and the Secretaria Xeral de Universidades (Ref. ED431G 2019/01)