1,676 research outputs found
[Reseña] Hernández Nieves, Román, “Felipe Checa”
No full textEs una reseña de la obra: Hernández Nieves, Roman, “Felipe Checa”, Zaragoza, Fundación Caja de Badakoz, 2004, 141 pp ., y numerosas ilustraciones.It`s a review of the work: Hernández Nieves, Roman, “Felipe Checa”, Zaragoza, Fundación Caja de Badakoz, 2004, 141 pp ., y numerosas ilustraciones
Cervecería Checa: una oportunidad de franquicia
No full textEn el presente trabajo, se desarrollará un plan estratégico para la empresa Checa
S.A a fin de incrementar su rentabilidad. Esto, se llevará a cabo mediante la elaboración
de 3 planes de acción que involucran: un análisis y mejora de sus procesos internos,
implementación de capacitaciones, y contratación de una consultora externa para etapa
final de la propuesta. Además de incrementar su rentabilidad, la implementación de un
sistema de franquicias del bar Casa Negra, le permitirá a Checa crecer como marca y
mejorar su posicionamiento en el mercado. A continuación, se desarrollará en detalle la
planificación estratégica para Checa S. A.DESTACAD
Location-privacy-preserving technique for 5g mmwave devices
No full textIn fifth generation (5G) cellular networks, a single base station equipped with multiple antennas can determine the user position within centimeters, by processing the wireless millimeter-wave channel estimate. A fake base station serving a victim user can also obtain the user location. In order to protect the user privacy, we propose a technique to prevent localization. We design a user transmit beamformer, so that the angles of departure of each channel path are hidden to the base station, thus preventing localization. We also optimize the allocated power, in order to maximize the achievable rate. The proposed solution is compared with both the capacity-achieving beamforming (without location privacy) and the zero-forcing beamforming, which still provides location privacy, at the cost of a lower rate
Simulation of a knee implanted with an interpositional spacer during a gait cycle using explicit finite element analysis
No full textInfluence of an interpositional spacer on the behaviour of the tibiofemoral joint: a finite element study
No full textBackground: interpositional arthroplasty is considered by many surgeons for the treatment of isolated medial compartment osteoarthritis of the knee. In this procedure, an interpositional spacer is inserted into the medial compartment of the joint with no bone resection and no mechanical fixation. Major problems such as implant dislocation, severe pain or need for revision have been reported post-operatively.Methods: in this study, the kinematics of a knee implanted with an interpositional spacer made of either polyurethane or cobalt–chrome during walking, stair ascent and squatting cycles have been predicted and compared to the normal knee using finite element analysis. In addition, articular cartilage stress histories have been examined to obtain distributions of cumulative stress, a measure of the likelihood of articular cartilage degeneration.Findings: the insertion of a polyurethane interpositional spacer in the medial side of the knee did not affect knee kinematics as compared to the normal knee, but caused an increase of articular cartilage cumulative contact stress exposures in the medial compartment of the joint. The knee implanted with the Co–Cr spacer exhibited similar trends in knee kinematics, however significantly different ranges of motion were observed during some periods of the activity cycles, specifically during the first half of the walking cycle where lower ranges of motion were predicted. In addition, higher articular cartilage cumulative contact stress exposures were observed in both compartments of the knee. In both cases, cumulative contact stress exposures of the tibial articular cartilage were more affected than those of the femoral articular cartilage.Interpretation: these results suggest implant material as an important parameter in the design phase of interpositional spacer
Il «Magazin« (1780-1782) spagnolo di Friedrich Justin Bertuch e il suo contesto
No full textLe pionieristiche ricerche di Dietrich Briesemeister hanno allargato il discorso dell’ispanistica nel senso dei transferts culturali attirando l’attenzione, in particolare, su Friedrich Justin Bertuch (1747-1822). Questo poliedrico imprenditore culturale trasforma Weimar in un importante centro di irradiazione della cultura spagnola in Germania. Il contributo in oggetto individua per la prima volta un preciso nesso fra l’identificarsi delle relazioni con l’Italia (culminate nel «Magazin der italienischen Litteratur und Künste» di Christian Joseph Jagemann, fondato nel 1780), l’operato di Christoph Gottlieb von Murr e il «Magazin der Spanischen und Portugiesischen Literatur» di Bertuch. Tutta basata su lettere inedite è la ricostruzione sia dei rapporti fra Bertuch e Murr, sia dei rapporti fra Bertuch e Christian Felix Weiße, editore fino al 1782 di una rivista sassone all’avanguardia nella diffusione della letteratura spagnola, la «Neue Bibliothek der schönen Wissenschaften und der freyen Künste».
Il filtro inglese risulta evidente nelle due imprese traduttive immediatamente precedenti al «Magazin», The History of the famous Preacher Friar Gerund de Campazas; otherwise Gerund Zotes (traduzione di Baretti) e la Historia del famoso predicador fray Gerundio de Campazas alias Zotes.
La caratterizzazione del «Magazin» e della sua eco sulle riviste tedesche coeve include la smentita (sempre in base a materiali inediti conservati nel fondo Bertuch del Goethe- und Schiller-Archiv di Weimar) della tesi di Heymann.
L’ampio contributo è concluso dall’analisi del Manual de la lengua española oder Handbuch der Spanischen Sprache in cui Bertuch usa i testi dei migliori poeti e prosatori spagnoli come eserciziario e dall’analisi della coeva traduzione del Nouveau voyage ou Tableau de l’etat actuel de cette Monarchie di Jean-François Bourgoing con il titolo Neue Reise durch Spanien vom Jahr 1782 bis 1788. Nel secondo volume di tale traduzione appare in appendice un trattatello Über den gegenwärtigen Zustand der Literatur in Spanien di Thomas Tychsen ove si constata l’inconsistenza dell’«opinio communis secondo cui la Spagna sarebbe un luogo delle tenebre e dell’ignoranza».
Il contributo offerto da G. Cantarutti e S. Ruzzenenti viene valutato in questi termini da José Checa Beltrán, responsabile del gruppo di ricerca sulle «lecturas del legado literario-cultural español» nell’Europa dei Lumi: «este capítulo [...] ilumina una compleja red de relaciones entre intelectuales de distintos países europeos y ofrece una rica mina de datos inéditos sobre traducciones, sinergias y autores que operaban en la Europa del siglo XVIII»
Effects of ligament pretension on the biomechanics of the knee: a finite element analysis
No full textA large number of finite element models have been developed to study the behaviour of the knee joint under different loading conditions. They have been used to study knee ligament function, knee prosthesis design and ligament reconstruction procedures. The terms pretension or prestrain of a knee ligament refer to the strain in the ligament when the joint is at full extension and little is known about its influence on the kinematics of the joint. In knee models, the ligament reference strains are usually merely estimated [1] and sometimes adapted by means of trial and error in order to get better agreement with experimental data [2]. As a consequence, very different values can be found in the literature. The purpose of this study was to analyze how ligament prestrains can affect the kinematics of the knee predicted with a FE model
Degeneration propensity of articular cartilage in a knee implanted with an interpositional spacer
No full textMixed Subdivisions Suitable for the Greedy Canny–Emiris Formula
No full textThe Canny–Emiris formula (Canny and Emiris in International symposium on applied algebra, algebraic algorithms, and error-correcting codes, 1993) gives the sparse resultant as the ratio of the determinant of a Sylvester-type matrix over a minor of it, both obtained via a mixed subdivision algorithm. In Checa and Emiris (Proceedings of the 2022 international symposium on symbolic and algebraic computation, 2022), the same authors gave an explicit class of mixed subdivisions for the greedy approach so that the formula holds, and the dimension of the constructed matrices is smaller than that of the subdivision algorithm, following the approach of Canny and Pedersen (An algorithm for the Newton resultant, 1993). Our method improves upon the dimensions of the matrices when the Newton polytopes are zonotopes and the systems are multihomogeneous. In this text, we provide more such cases, and we conjecture which might be the liftings providing minimal size of the resultant matrices. We also describe two applications of this formula, namely in computer vision and in the implicitization of surfaces, while offering the corresponding JULIA code. We finally introduce a novel tropical approach that leads to an alternative proof of a result in Checa and Emiris (Proceedings of the 2022 international symposium on symbolic and algebraic computation, 2022). © The Author(s) 2024
Inmigración y Diversidad en España.Una Aproximación desde el Extrañamiento Cultural
No full texten este artículo el autor muestra cómo se está percibiendo la diversidad transnacional en
España, basada, sobre todo, en el descubrimiento cul tural que provocan los inmigrados ya
instalados en el país. Para ello, primero, expone cómo históricamente se ha entendido la diversidad
o extranjería; segundo, aún considerando que ésta es un problema de representaciones, demuestra
cómo la diversidad puede llegar a ser una fuente de conflictos, especialmente con la población
magrebí, portadora de la visibilidad del is lam en España; por último, se observa que esta
representación negativizada suele conducir a un choque cul tural. Checa discute este concepto y
propone otro que valora más acertado, como es el de extrañamiento cul tural, donde el encuentro
cul tural no es tanto un choque como un desencuentro, una extrañeza irreflexible por
desconocimiento; así lo pone de manifiesto una encuesta realizada en tre jóvenes andaluces,
tomada como base
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