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Sparse bounds for the discrete spherical maximal functions 

Kesler, Robert; Lacey, Michael T.; Mena Arias, Darío Alberto (2020)
We prove sparse bounds for the spherical maximal operator of Magyar, Stein and Wainger. The bounds are conjecturally sharp, and contain an endpoint estimate. The new method of proof is inspired by ones by Bourgain and ...
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Uniform sparse bounds for discrete quadratic phase Hilbert transforms 

Kesler, Robert; Mena Arias, Darío Alberto (2017-09)
Consider the discrete quadratic phase Hilbert Transform acting on $\ell^{2}(\mathbb{Z})$ finitely supported functions $$ H^{\alpha} f(n) : = \sum_{m \neq 0} \frac{e^{i\alpha m^2} f(n - m)}{m}. $$ We prove that, ...
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Climate-based descriptive models of dengue fever: The 2002 epidemic in Colima, Mexico 

Chowell, Gerardo; Sánchez Peña, Fabio Ariel (2006-06)
Dengue is a public health problem on the rise in many tropical regions and affects approximately 100 million people every year worldwide. In this paper, the authors retrospectively assess the association between five ...
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On the approximation of a virtual coarse space for domain decomposition methods in two dimensions 

Calvo Alpízar, Juan Gabriel (2018)
A new extension operator for a virtual coarse space is presented which can be used in domain decomposition methods for nodal elliptic problems in two dimensions. In particular, a two-level overlapping Schwarz algorithm is ...
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Parallel Sums and Adaptive BDDC Deluxe 

Widlund, Olof B.; Calvo Alpízar, Juan Gabriel (2017)
There has recently been a considerable activity in developing adaptive methods for the selection of primal constraints for BDDC algorithms and, in particular, for BDDC deluxe variants. The primal constraints of a BDDC or ...
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Sparse bounds for Bochner–Riesz multiplers 

Lacey, Michael T.; Mena Arias, Darío Alberto; Reguera, Maria Carmen (2019)
The Bochner–Riesz multipliers are shown to satisfy a range of sparse bounds. The range of sparse bounds increases to the optimal range, as δ increases to the critical value, even assuming only partial information on the ...
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La educación de la matemática: un valor encarcelado en la prisión del lenguaje formal 

Mena Castillo, Pablo José (2006)
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A BDDC algorithm with deluxe scaling for H(curl) in two dimensions with irregular subdomains 

Calvo Alpízar, Juan Gabriel (2015)
A bound is obtained for the condition number of a BDDC algorithm for problems posed in H(curl) in two dimensions, where the subdomains are only assumed to be uniform in the sense of Peter Jones. For the primal variable ...
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Transmission dynamics of Dengue in Costa Rica: The role of hospitalizations
Dinámica de la transmisión de dengue en Costa Rica: El rol de las hospitalizaciones 

Sánchez Peña, Fabio Ariel; Arroyo Esquivel, Jorge; Vásquez Brenes, Paola Andrea (2019-12)
For decades, dengue virus has caused major problems for public health officials in tropical and subtropical countries around the world. We construct a compartmental model that includes the role of hospitalized individuals ...
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A partial differential equation model with age-structure and nonlinear recidivism: Conditions for a backward bifurcation and a general numerical implementation 

Sánchez Peña, Fabio Ariel; Calvo Alpízar, Juan Gabriel; Segura Ugalde, Esteban; Feng, Zhilan (2019-12-15)
We formulate an age-structured three-staged nonlinear partial differential equation model that features nonlinear recidivism to the infected (infectious) class from the temporarily recovered class. Equilibria are computed, ...
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AuthorCalvo Alpízar, Juan Gabriel (9)Sánchez Peña, Fabio Ariel (8)Barboza Chinchilla, Luis Alberto (3)Mena Arias, Darío Alberto (3)Vásquez Brenes, Paola Andrea (3)Arroyo Esquivel, Jorge (2)Kesler, Robert (2)Lacey, Michael T. (2)Castillo Elizondo, William (1)Chowell, Gerardo (1)... View MoreTypeartículo científico (16)tesis de licenciatura (2)tesis de maestría (2)capítulo de libro (1)ProcedenceVicerrectoría de Investigación (16)Vicerrectoría de Docencia (10)Sedes Regionales (1)... View MoreHas File(s)
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  • Repositorios universitarios

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Repositorio Institucional de la Universidad de Costa Rica. Algunos derechos reservados. Este repositorio funciona con DSpace.