1,833 research outputs found

    Control of Disturbing Loads in Residential and Commercial Buildings via Geometric Algebra

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    Many definitions have been formulated to represent nonactive power for distorted voltages and currents in electronic and electrical systems. Unfortunately, no single universally suitable representation has been accepted as a prototype for this power component. This paper defines a nonactive power multivector from the most advanced multivectorial power theory based on the geometric algebra (GA). The new concept can have more importance on harmonic loads compensation, identification, and metering, between other applications. Likewise, this paper is concerned with a pioneering method for the compensation of disturbing loads. In this way, we propose a multivectorial relative quality index‚ÄČ‚ÄČ associated with the power multivector. It can be assumed as a new index for power quality evaluation, harmonic sources detection, and power factor improvement in residential and commercial buildings. The proposed method consists of a single-point strategy based of a comparison among different relative quality index multivectors, which may be measured at the different loads on the same metering point. The comparison can give pieces of information with magnitude, direction, and sense on the presence of disturbing loads. A numerical example is used to illustrate the clear capabilities of the suggested approach

    Multivectorial strategy to interpret a resistive behaviour of loads in smart buildings

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    In Smart buildings, electric loads are affected by an important distortion in the current and voltage waveforms, caused by the increasing proliferation of non linear electronic devices. This paper presents an approach on non sinusoidal power theory based on Geometric Algebra that clearly improves traditional methods in the optimization of apparent power and power factor compensation. An example is included that demonstrates the superiority of this approach compared with traditional methods.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

    Aspectos semióticos en el lenguaje visual de la hibridación arquitectónica chino-europea

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    This article analyses some concepts related to the architectural sign and presents itself a semiotic reading of one of the most important works of art of the architecture in Qing dynasty (18th Century): the Yuanying Guan (View of the Distant Sea) pavilion. Semiotic structures were employed to interpret the expression of architectural forms and formulate a subsequent understanding of these forms by turning each element into a communication tool.Este artículo analiza conceptos relacionados con el signo arquitectónico, y presenta una reflexión sobre aspectos semióticos del lenguaje visual de una de las obras de arte más importantes de la arquitectura en la dinastía Qing (S. XVIII): el Palacio Yuanying Guan (Vistas a un Mar distante). Se han utilizado conceptos y estructuras semióticas para interpretar la expresión de sus formas arquitectónicas y formular una comprensión posterior de dichas formas, convirtiendo cada elemento en una herramienta de comunicación.This article analyses some concepts related to the architectural sign and presents itself a semiotic reading of one of the most important works of art of the architecture in Qing dynasty (18th Century): the Yuanying Guan (View of the Distant Sea) pavilion. Semiotic structures were employed to interpret the expression of architectural forms and formulate a subsequent understanding of these forms by turning each element into a communication tool

    Semantic Construction and Form: Foundations of the Communicative Dimension in Contemporary Architecture

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    Aquest article investiga les caracter√≠stiques de la concepci√≥ simb√≤lica de l‚Äôarquitectura al panorama que sorgeix de la crisi de la modernitat i evoluciona fins als nostres dies, aix√≠ com els aspectes m√©s significatius en relaci√≥ amb la seva comprensi√≥ sem√†ntica. Per aix√≤ aborda els conceptes relacionats amb el signe i utilitza la semi√≤tica com a metodologia original d‚Äôan√†lisi amb l‚Äôobjectiu d‚Äôinterpretar els elements visuals que transmeten un significat. En aquest sentit, les eines semi√≤tiques com a s√≠mbol, met√†fora o icona, entre d‚Äôaltres, interpreten l‚Äôexpressi√≥ de formes arquitect√≤niques i formulen la seva comprensi√≥ posterior i les converteixen en eines de comunicaci√≥. Aquesta visi√≥ de l‚Äôarquitectura contempor√†nia situa el seu llenguatge en el context de la teoria dels signes, contribuint a explicar, amb una nova metodologia, les emocions que transmet un objecte arquitect√≤nic i la seva relaci√≥ amb lint√®rpret (usuari).This paper examines the characteristics of the symbolic conception of architecture in the panorama that arises from the crisis of modernity and evolves to the present day, as well as the most significant aspects in relation to its semantic understanding. To this end, the research addresses the concepts related to the sign and uses Semiotics as an original analysis methodology with the aim of interpreting the visual elements that convey a meaning. Therefore, semiotic tools such as symbol, metaphor, or icon, among others, interpret the expression of architectural forms and formulate their subsequent understanding, turning them into communication tools. This approach of contemporary architecture takes place in the context of the theory of signs, helping to explain, with a new methodology, the emotions transmitted by an architectural object and its relationship with the interpreter (user).Este art√≠culo investiga las caracter√≠sticas de la concepci√≥n simb√≥lica de la arquitectura en el panorama que surge de la crisis de la modernidad y evoluciona hasta nuestros d√≠as, as√≠ como los aspectos m√°s significativos en relaci√≥n con su comprensi√≥n sem√°ntica. Para ello aborda los conceptos relacionados con el signo y utiliza la Semi√≥tica como metodolog√≠a original de an√°lisis con el objetivo de interpretar los elementos visuales que transmiten un significado. En este sentido, las herramientas semi√≥ticas como s√≠mbolo, met√°fora o icono, entre otras, interpretan la expresi√≥n de formas arquitect√≥nicas y formulan su comprensi√≥n posterior convirti√©ndolas en herramientas de comunicaci√≥n. Esta visi√≥n de la arquitectura contempor√°nea sit√ļa su lenguaje en el contexto de la teor√≠a de los signos, contribuyendo a explicar, con una nueva metodolog√≠a, las emociones que transmite un objeto arquitect√≥nico y su relaci√≥n con el int√©rprete (usuario).Peer Reviewe

    Caracterización de la pandemia de gripe A H1N1 2009 en Navarra

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    Fundamento. Describir la actividad gripal durante la pandemia de 2009-2010 en Navarra y compararla con la de temporadas anteriores. M√©todos. Se han analizado los casos de gripe notificados en atenci√≥n primaria y todas las confirmaciones virol√≥gicas realizadas en pacientes de atenci√≥n primaria y en hospitales de Navarra entre las semanas 21 de 2009 y 20 de 2010. Resultados. El virus de la gripe A (H1N1) 2009 se detect√≥ en Navarra entre las semana 23 de 2009 a la 2 de 2010, periodo en el que se registraron 39 casos con diagn√≥stico m√©dico de s√≠ndrome gripal por 1.000 habitantes. El umbral epid√©mico se super√≥ en dos periodos, con un pico en julio y otro mayor en noviembre. La mayor incidencia se alcanz√≥ en ni√Īos de 5 a 14 a√Īos (121 por mil), seguidos por el grupo de menores de 5 a√Īos. Se produjeron 224 hospitalizaciones (36 por 100.000 habitantes) con confirmaci√≥n de gripe A H1N1 2009, 8% de ellos requirieron ingreso en unidades de cuidados intensivos y hubo cuatro defunciones (0,6 por 100.000 habitantes). La tasa de hospitalizaciones fue mayor en ni√Īos menores de 5 a√Īos (163 por 100.000 habitantes), mientras que la probabilidad de derivaci√≥n a cuidados intensivos aument√≥ con la edad. Conclusi√≥n. A pesar de no haber dispuesto de una vacuna espec√≠fica hasta que la temporada estaba muy avanzada, el virus de gripe A (H1N1) 2009 produjo una onda gripal en rangos similares a los de otras temporadas y su repercusi√≥n en hospitalizaciones y casos graves fue moderada.Background. To describe influenza activity during the 2009-2010 pandemic in Navarre and compare it to previous seasons. Methods. An analysis was made of all influenza-like illness cases reported in primary care and all the virological confirmations made in patients in primary care and in hospitals of Navarre between week 21 of 2009 and week 20 of 2010. Results. Influenza 2009 H1N1 virus was detected in Navarre between week 23 of 2009 and week 2 of 2010, a period when 39 medically diagnosed cases of influenza-like illness per 1,000 inhabitants were registered. The epidemic threshold was surpassed in two periods, with a peak in July and a greater one in November. The greatest incidence was reached in children aged between 5 and 14 years (121 per thousand), followed by the group of under fives. There were 224 hospitalisations (36 per 100,000 inhabitants) with confirmation of influenza 2009 H1N1 virus, 8% of whom required admission to intensive care units and there were four deaths (0.6 per 100,000 inhabitants). The rate of hospitalisation was greater amongst children under five (163 per 100,000 inhabitants), while the probability of referral to intensive care increased with age. Conclusion. In spite of not having a specific vaccine available until the season was very well advanced, influenza 2009 H1N1 virus produced a wave of cases with similar incidence to those of other seasons and its repercussion in hospitalisations and serious cases was moderate

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

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    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 √į√į¬•with constraints√į √į √į¬• ¬• √įand√į¬ī√į¬• = √į. 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

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