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Search Results: 1 - 10 of 228381 matches for " Rodríguez-López "
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A Homomorphism Theorem for Bilinear Multipliers
Salvador Rodríguez-López
Mathematics , 2012, DOI: 10.1112/jlms/jdt043
Abstract: In this paper we prove an abstract homomorphism theorem for bilinear multipliers in the setting of locally compact Abelian (LCA) groups. We also provide some applications. In particular, we obtain a bilinear abstract version of K. de Leeuw's theorem for bilinear multipliers of strong and weak type. We also obtain necessary conditions on bilinear multipliers on non-compact LCA groups, yielding boundedness for the corresponding operators on products of rearrangement invariant spaces. Our investigations extend some existing results in Euclidean spaces to the framework of general LCA groups, and yield new boundedness results for bilinear multipliers in quasi Banach spaces.
Restriction results for multilinear multipliers on weighted settings
Salvador Rodríguez-López
Mathematics , 2013,
Abstract: We obtain restriction results of K. de Leeuw's type for maximal operators defined through multilinear Fourier multipliers of either strong or weak type acting on weighted Lebesgue spaces. We give some application of our development. In particular we obtain periodic weighted results for Coifman-Meyer, H\"ormander and H\"ormander-Mihlin type multilinear multipliers.
Study of Solutions to Some Functional Differential Equations with Piecewise Constant Arguments
Juan J. Nieto,Rosana Rodríguez-López
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/851691
Abstract: We provide optimal conditions for the existence and uniqueness ofsolutions to a nonlocal boundary value problem for a class of linearhomogeneous second-order functional differential equations with piecewise constant arguments. The nonlocal boundary conditions includeterms of the state function and the derivative of the state function. Asimilar nonhomogeneous problem is also discussed.
Abordaje del paciente hiperfrecuentador de servicios en atención primaria: un acercamiento desde la teoría
Rodríguez-López,Mérida Rosa;
Revista Gerencia y Políticas de Salud , 2012,
Abstract: this article is a literature review on frequent-attenders in health services. the current study objective was to analyze the problem for patients, families and health system and its potential related factors. a search in national and international journals was conducted to find a definition criteria for detection and to analyze the factors that may generate or perpetuate such behavior in the national context, based on the theoretical model of aday and andersen. it also suggests some intervention strategies in low-complexity services. we propose the use of percentiles for case definition and common mental disorders as potential contributors to this health behavior. this article hopes to contribute to understanding the use of services when access barriers are overcome.
Ecofisiología, una aproximación mecanicista a los procesos ecológicos
F. Valladares,N.F. Rodríguez-López
Ecosistemas , 2010,
Abstract:
Study of the Ion Transfer of Quaternary Ammonium Ions by SWV
Joaquín Rodríguez-López,Marcelo Videa
Revista de la Sociedad Química de México , 2012,
Abstract: La transferencia simple a través de la interfaz agua/nitrobenceno de tres cationes modelo de amonio cuaternario: tetrametilamonio (TMA+), colina (CH+) y tetrabutilamonio (TBA+), fue seguida por voltamperometría de onda cuadrada (VOC), una técnica que proporciona mayor sensibilidad en la cuantificación en comparación con otras técnicas convencionales. Se observó una respuesta lineal y reproducible en el intervalo de 10 a 100 μM. Los límites de detección obtenidos por el método ULA-2 fueron 5.9, 10.7 y 13.8 mM para los iones mencionados, respectivamente. El análisis simultáneo e independiente de dos iones con diferentes caracteres hidrófilos tales como TBA+ y Ch+ se logra mediante la inspección directa de los voltamogramas resultantes después de la sustracción de fondo. Se presenta el efecto particular de la temperatura sobre la respuesta de SWV estudiado en el intervalo de 288 K a 313 K. El pico de corriente diferencial muestra un aumento lineal significativo con el aumento de la temperatura mientras que las corrientes de fondo no muestran ninguna variación, convirtiendo así la combinación de la aplicación de un método de pulso diferencial y una temperatura óptima en una opción notable para el análisis cuantitativo del ion amonio cuaternario.
Existence of extremal solutions for quadratic fuzzy equations
Nieto Juan J,Rodríguez-López Rosana
Fixed Point Theory and Applications , 2005,
Abstract: Some results on the existence of solution for certain fuzzy equations are revised and extended. In this paper, we establish the existence of a solution for the fuzzy equation , where , , , and are positive fuzzy numbers satisfying certain conditions. To this purpose, we use fixed point theory, applying results such as the well-known fixed point theorem of Tarski, presenting some results regarding the existence of extremal solutions to the above equation.
Existence of extremal solutions for quadratic fuzzy equations
Juan J. Nieto,Rosana Rodríguez-López
Fixed Point Theory and Applications , 2005, DOI: 10.1155/fpta.2005.321
Abstract: Some results on the existence of solution for certain fuzzy equations are revised and extended. In this paper, we establish the existence of a solution for the fuzzy equation Ex2+Fx+G=x, where E, F, G, and x are positive fuzzy numbers satisfying certain conditions. To this purpose, we use fixed point theory, applying results such as the well-known fixed point theorem of Tarski, presenting some results regarding the existence of extremal solutions to the above equation.
Existence of Periodic Solution for a Nonlinear Fractional Differential Equation
Belmekki Mohammed,Nieto JuanJ,Rodríguez-López Rosana
Boundary Value Problems , 2009,
Abstract: We study the existence of solutions for a class of fractional differential equations. Due to the singularity of the possible solutions, we introduce a new and proper concept of periodic boundary value conditions. We present Green's function and give some existence results for the linear case and then we study the nonlinear problem.
Has a star enough energy to excite the thousand of modes observed with CoRoT?
A. Moya,C. Rodríguez-López
Physics , 2009, DOI: 10.1088/2041-8205/710/1/L7
Abstract: The recent analyses of the light curves provided by CoRoT have revealed pulsation spectra of unprecedented richness and precision, in particular, thousands of pulsating modes, and a clear distribution of amplitudes with frequency. In the community, some scientists have started doubting about the validity of the classical tools to analyze these very accurate light curves. This work provides the asteroseismic community with answers to this question showing that (1) it is physically possible for a star to excite at a time and with the observed amplitudes such a large number of modes; and (2) that the kinetic energy accumulated in all those modes does not destroy the equilibrium of the star. Consequently, mathematical tools presently applied in the analyses of light curves can a priori be trusted. This conclusion is even more important now, when a large amount of space data coming from Kepler are currently being analyzed. The power spectrum of different stellar cases, and the non-adiabatic code GraCo have been used to estimate the upper limit of the energy per second required to excite all the observed modes, and their total kinetic energy. A necessary previous step for this study is to infer the relative radial pulsational amplitude from the observed photometric amplitude, scaling our linear pulsational solutions to absolute values. The derived upper limits for the required pulsational energy were compared with 1) the luminosity of the star; and 2) the gravitational energy. We obtained that both upper energy limits are orders of magnitude smaller.
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