Results 41 to 50 of about 239,093 (224)

Condiciones de contorno en el método de diferencias finitas con mallas irregulares [PDF]

open access: yes, 1988
En el método de diferencias finitas con mallas arbitrarias, las ecuaciones de dominio se aproximan a partir de invertir la matriz estrella para cada estación.
Godoy, Luis A., Luccioni, Bibiana M.
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PhyBaSE: A Bayesian structural equation model approach to causal inference in phylogenetic comparative analyses

open access: yesMethods in Ecology and Evolution, Volume 16, Issue 6, Page 1136-1148, June 2025.
Abstract One of the main limitations of phylogenetic comparative analyses is that associations between traits can only be interpreted as correlations. Here, we present a novel Bayesian structural equation model (PhyBaSE) which allows us to disentangle direct from indirect relationships among variables to propose potential causal hypotheses while ...
Achaz von Hardenberg   +1 more
wiley   +1 more source

Length-frequency estimation for yellowfin tuna (Thunnus albacares) caught by commercial fishing gear in the Eastern Pacific Ocean [PDF]

open access: yes, 1992
ENGLISH: Methods of collecting samples for the purpose of estimating the numbers and weights of fish caught, by length interval, are described. Several models for two-stage sampling are described, and the equations for the estimators and their variances ...
Calkins, Thomas P.   +2 more
core  

A Strong Approximation in L2 for the Solutions of the Maxwell System With Highly Oscillating Periodic Coefficients

open access: yesMathematical Methods in the Applied Sciences, Volume 48, Issue 8, Page 9207-9224, 30 May 2025.
ABSTRACT We consider a Maxwell system on ℝ3$$ {\mathbb{R}}^3 $$ with highly oscillating periodic coefficients. It is known that the solutions converge in the weak‐ ∗$$ \ast $$ topology of L∞(0,T;L2(ℝ3))$$ {L}^{\infty}\left(0,T;\kern0.3em {L}^2\left({\mathbb{R}}^3\right)\right) $$ to the solution of a similar problem with constant coefficients given as ...
Juan Casado‐Díaz   +2 more
wiley   +1 more source

Fundación Mazda para el arte y la ciencia décima segunda entrega de becas

open access: yesCivilizar, 2003
Matemáticos y físicos, desde los albores de estas disciplinas han formulado problemas y conjeturas que muy posteriormente y gracias a herramientas nuevas y deaarrollo insospechados han encontrado alguna respuesta.
Fernando Isaza Delgado
doaj  

Dirichlet problems with skew-symmetric drift terms

open access: yesComptes Rendus. Mathématique
We prove existence of finite energy solutions for a linear Dirichlet problem with a drift and a convection term of the form $A\,E(x)\nabla u + \mathrm{div}(u\,E(x))$, with $A > 0$ and $E$ in $(L^{r}(\Omega ))^{N}$.
Boccardo, Lucio   +2 more
doaj   +1 more source

Ecuaciones lineales y cuadráticas [PDF]

open access: yes, 2018
23 p.En matemáticas las ecuaciones son igualdades entre expresiones algebraicas. La solución de una ecuación es un valor numérico que, sustituido en el lugar de la variable, hace que la ecuación se convierta en una identidad.
Torrijos, Margarita
core  

Chemostat models with Monod and Haldane consumption functions and random environmental fluctuations

open access: yesMathematical Methods in the Applied Sciences, Volume 48, Issue 7, Page 7412-7431, 15 May 2025.
In this paper, we study the asymptotic dynamics of two chemostat models with random environmental fluctuations modeled by means of real noise, where different consumption functions for the consumer species (Monod and Haldane) are taking into account. For each model, our main goal is to investigate the existence of deterministic attracting sets.
Tomás Caraballo   +2 more
wiley   +1 more source

Sistemas de ecuaciones

open access: yesCatálogo editorial, 2021
En dos de los problemas estudiados en sesiones anteriores se ha necesitado solucionar sistemas de ecuaciones lineales. En el caso de los trazadores cúbicos, es necesario solucionar un sistema tridiagonal con el fin de conocer los ci y en el cual la dimensión del sistema depende del número de puntos a interpolar.
Diego Arévalo-Ovalle   +2 more
openaire   +1 more source

Polinomios y Ecuaciones Relacionadas [PDF]

open access: yes, 2014
Con este cursillo se pretende dar a conocer algunas propiedades de los polinomios como lo son las fórmulas de Vieta, algunas herramientas simples para encontrar raíces, las transformaciones de los polinomios y las identidades de Newton. Estas propiedades
Uribe G., Gabriel D.
core  

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