156 resultados para quasi-periodicity
Resumo:
We present the induced generalized ordered weighted averaging (IGOWA) operator. It is a new aggregation operator that generalizes the OWA operator by using the main characteristics of two well known aggregation operators: the generalized OWA and the induced OWA operator. Then, this operator uses generalized means and order inducing variables in the reordering process. With this formulation, we get a wide range of aggregation operators that include all the particular cases of the IOWA and the GOWA operator, and a lot of other cases such as the induced ordered weighted geometric (IOWG) operator and the induced ordered weighted quadratic averaging (IOWQA) operator. We further generalize the IGOWA operator by using quasi-arithmetic means. The result is the Quasi-IOWA operator. Finally, we also develop a numerical example of the new approach in a financial decision making problem.
Resumo:
We present an algorithm for the computation of reducible invariant tori of discrete dynamical systems that is suitable for tori of dimensions larger than 1. It is based on a quadratically convergent scheme that approximates, at the same time, the Fourier series of the torus, its Floquet transformation, and its Floquet matrix. The Floquet matrix describes the linearization of the dynamics around the torus and, hence, its linear stability. The algorithm presents a high degree of parallelism, and the computational effort grows linearly with the number of Fourier modes needed to represent the solution. For these reasons it is a very good option to compute quasi-periodic solutions with several basic frequencies. The paper includes some examples (flows) to show the efficiency of the method in a parallel computer. In these flows we compute invariant tori of dimensions up to 5, by taking suitable sections.
Resumo:
En ple procés de codificació del dret civil de Catalunya, pot semblar quelcom romàntic analitzar com es visqué al Principat un altre moviment co- dificador: el del segle XIX. És clar que aquest darrer tenia un caràcter que no s"assembla en res a l"actual, tret de la mateixa voluntat de codificar. Es va tractar aleshores d"unificar i sistematitzar el dret civil d"Espanya, en resposta a una tendència generalitzada que s"havia estès a bona part d"Europa. Es tracta, ara, de codificar el dret civil de Catalunya en exercici d"una competència legislativa constitucionalment i estatutàriament reconeguda. Malgrat aquesta diferent significació, o potser per això, sentim un agradable sentimentalisme en mirar enrere. L"objecte del nostre comentari se centra, només, en l"intent de codificació de mitjan segle XIX: en l"anomenat Projecte de Codi civil de 1851. A Catalunya, el dit Projecte va despertar reaccions apassionades, quasi totes desfavorables al text codificat i no tant pel fet de voler codificar el dret civil, sinó pel caire castellanitzant del seu contingut, que negava tota vigència als altres drets territorials. Alhora, l"anàlisi que es proposa es redueix a la regulació projectada de la llegítima. I la resposta que va merèixer des de Catalunya s"esbossà de la mà d"un jurista autoritzat de l"època: Estanislao Reynals i Rabassa. Esdevé un més entre una gran munió de personatges vuitcentistes, tots ells intel·lectuals, que apareixen aquí i allà, en el decurs d"esdeveniments literaris, acadèmics, polítics, etc., i que permeten identificar una reacció prou sentida en contra dels elements revulsius dels trets de la identitat catalana.
Resumo:
One of the founders of numismatics in Modern Age was the archbishop of Tarragona and renowned jurist Antonio Agustín. He was educated during the mid-sixteenth century mainly in Italy, particularly in Bologna and Padua. His role in the development of antiquarian studies – and interest in collecting – ran parallel to the development of numismatics in the Cinquecento. His interest in realia , i.e., the materials and documents perceived as primary evidence of history understood in a global sense, make him a pioneer in setting the trends and methodologies which would be later employed by Bernard de Montfaucon. The period Antonio Agustín spent in Bologna, at the Reale Collegio di Spagna, between 1539 and 1544, afforded him the opportunity to enter a very cultivated circle where the admiration and study of the Antique was well established since the mid-fifteenth century. The cultural effervescence taking place in Bologna was encouraged by the court of Giovanni II Bentivoglio and the University alike. Artists also contributed to the development of antiquarian knowledge, and the painter Amico Aspertini (ca. 1475-1552) exemplifies this. It is clear that Antonio Agustín certainly benefited from the scholarly environment in Bologna during the first half of the Cinquecento, which had been firmly anchored since the fertile Quattrocento. Although the documentary evidence is scarce, and it is difficult to pinpoint the details, it is undeniable that Antonio Agustín was heavily influenced by his Bolognese experience.
Resumo:
Broadband access is a key factor for economic and social development. However, providing broadband to rural areas is not attractive to private telecommunications operators due its low or zero investment return. To deal with broadband provision in rural areas, different governance systems based on private and public cooperation have appeared. This paper not only identifies and defines public and private cooperation models but also assesses their impact on overcoming the digital divide in rural areas. The results show that public ownership infrastructure under private management policy has had positive effects on reducing the broadband digital divide and being applied to areas with higher digital divide; subsides to private operators providers only positive effects on reducing broadband digital divide; but public infrastructure with public management programs did not. The results, obtained using quasi-experimental methods, suggest the importance of incentives and control mechanisms in broadband universal service provision plans.
Resumo:
This article presents the design and implementation of a progressive resistance strength program adapted to prostate cancer. The initial model corresponds to the guide of the American College Sports Medicine Position Stand (ACSM, 2009). This program includes the most habitual symptoms related to the illness and its treatments. The study design is quasi-experimental. The sample is 33 subjects in treatment phase. Study variables are tumour classification TNM, anthropometric measures, resistance strength, hypertension, fatigue, incontinence, pain and quality of life. After 24 weeks a significant improvement on resistance strength capacity is observed. This result is more consistent in lower extremities. Also improves hypertension, urinary incontinence, pain and quality of life. As conclusion, the improvement of the quality of life is mediated by the functional and physical capacity of the ill person