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Alda, Javier ; Sánchez Brea, Luis Miguel ; Salgado Remacha, Francisco Javier ; Rico-García, José María | John Wiley & SONS INC | 2010-04A diffractive optical element having equal-width concentric square rings is analyzed in this article. This constant width makes possible its realization using spatial light modulators or square pixels phase screens. It allows a simple analytical[...]texto impreso
The stoichiometric ratio for the synthesis components of hydrophobic new surface modifying macromolecules (nSMM) was altered systematically to produce three different types of nSMMs, which are called hereafter nSMM1, nSMM2, and nSMM3. The newly [...]texto impreso
Díaz Díaz, Jesús Ildefonso ; Alvino, A. ; Trombetti, G. ; Lions, P.L. | John Wiley & SONS INC | 1996-03We give some comparison results for elliptic equations by using Steiner symmetrization.texto impreso
García Villaluenga, Juan Pedro ; Barragán García, Vicenta María ; Izquierdo Gil, María Amparo ; Godino Gómez, María Paz ; Seoane Rodríguez, Benjamín ; Ruiz Bauzá, Carlos | John Wiley & SONS INC | 2009-11-05Liquid permeation measurements of water, methanol, and 2-propanol were carried out using a commercial cation-exchange membrane Nafion-117 (perfluorinated polyethylene with pendant ether-linked side chains terminated with sulfonated groups). The [...]texto impreso
This article deals with hierarchies of operators. In particular, we will analyze the problem of amalgamating individual opinions into a single group opinion, based upon hierarchical intensity aggregation rules. Our main goal is to decide whether[...]texto impreso
We will continue here the research work, the goal of which was to introduce the notion of nondeterministic aggregation operators and study their properties, even in relation to classification systems and the associated learning problem. Here we [...]texto impreso
The M/G/1 queue with repeated attempts is considered. A customer who finds the server busy, leaves the service area and joins a pool of unsatisfied customers. Each customer in the pool repeats his demand after a random amount of time until he fi[...]texto impreso
In teletraffic applications of retrial queues only the service zone is observable. Another part of a retrial queue, the orbit, which represents the delay before repeated attempts to get service, cannot be observed. Thus, it is very important to [...]texto impreso
An associative binary connective allows the evaluation of arbitrary finite sequences of items by means of a one-by-one sequential process. In this paper we develop an alternative approach for those nonassociative connectives, allowing a sequenti[...]texto impreso
The model considered in this paper involves a tandem queue consisting of a sequence of two waiting lines. The main feature of our model is blocking, i.e., as soon as the second waiting line reaches a certain upper limit, the first line is blocke[...]texto impreso
Retrial queueing systems are widely used in teletraffic theory and computer and communication networks. Although there has been a rapid growth in the literature on retrial queueing systems, the research on retrial queues with nonexponential retr[...]texto impreso
We consider an M/G/1 retrial queue with finite capacity of the retrial group. First, we obtain equations governing the dynamic of the waiting time. Then, we focus on the numerical inversion of the density function and the computation of moments.[...]
