Buscar recursos académicos

Mathematics and computer science play a pivotal role in modern biology. Dynamical models based on differential equations are particularly adapted to describe dynamic behaviors of many biological processes. However, tradi...

Background: The transition from arithmetic to algebra remains a persistent challenge in early mathematics education. While structural awareness is widely recognised as foundational to this shift, the developmental mecha...

Remote sensing-derived building footprint data has been widely applied in population mapping. However, nonresidential buildings typically occupy larger areas or volumes, and obtaining building footprint data with type in...

Abstract Likelihood-based inference for exponential-tail lifetime models can be unstable in finite samples, particularly under right-tail contamination. We develop a robust score-based inference procedure for the two-par...

The Pearl River Basin, a pivotal river system in Southern China, traverses ecologically fragile zones including the Yunnan-Guizhou Plateau, port trading zones of the Beibu Gulf in Guangxi, and urban economic zones of the...

"En esta tesis, se estudia el uso de iniciadores multifuncionales para la polimerización en masa de estireno. El objetivo general es desarrollar modelos matemáticos detallados, y a la vez genéricos, que permitan descr...

"This thesis is mainly dedicated to the study of high pressure alkaline electrolysis. Alkaline electrolysis is a well established technology and is commercially available. However, the operation at high pressure for disp...

There occurs on some occasions a difficulty in deciding the direction of causality between two related variables and also whether or not feedback is occurring. Testable definitions of causality and feedback are proposed ...

In management contexts, mathematical programming is usually used to evaluate a collection of possible alternative courses of action en route to selecting one which is best. In this capacity, mathematical programming serv...

Several issues relating to goodness of fit in structural equations are examined. The convergence and differentiation criteria, as applied by Bagozzi, are shown not to stand up under mathematical or statistical analysis. ...

Materias / palabras clave: Basic reproduction number; Ordinary differential equation; Stability (learning theory); Applied mathematics; Stability theory; Transmission (telecommunications); Manifold (fluid mechanics); Mathematics; Simple (philosoph...

In recent times, researchers across various fields have become interested in the topic of fractional calculus based on integrals and derivatives of fractional order. This area has numerous and widespread applications in ...

This paper models occasional, discrete shifts in the growth rate of a nonstationary series. Algorithms for inferring these unobserved shifts are presented, a byproduct of which permits estimation of parameters by maximum...

Due to the safety risks and training sample inefficiency, it is often preferred to develop controllers in simulation. However, minor differences between the simulation and the real world can cause a significant sim-to-re...

This paper gives a systematic application of maximum likelihood inference concerning cointegration vectors in non-stationary vector valued autoregressive time series models with Gaussian errors, where the model includes ...

A nonlinear (nonconvex) programming model provides a new definition of efficiency for use in evaluating activities of not-for-profit entities participating in public programs. A scalar measure of the efficiency of each p...

A diagram has been devised that can provide a concise statistical summary of how well patterns match each other in terms of their correlation, their root‐mean‐square difference, and the ratio of their variances. Alth...

Variable selection is fundamental to high-dimensional statistical modeling, including nonparametric regression. Many approaches in use are stepwise selection procedures, which can be computationally expensive and ignore ...

O objetivo deste trabalho foi a preparação de comprimidos contendo alta concentração de ex-trato de Maytenus ilicifolia seco por aspersão. Os comprimidos foram produzidos por compressão direta, empregando celulos...

O acetato de dexametasona (ADM), um fármaco de escassa solubilidade, foi incorporado em sua forma livre, complexada ou misturada fisicamente com β-ciclodextrina (βCD) em matrizes hidrofílicas de hidroxipropilmetilcel...

En los últimos años, se ha desarrollado un gran interés por la producción de polímeros denominados funcionales o specialties. Los mismos se destacan por poseer algunas propiedades particulares que dan lugar a aplica...

El poliestireno (PS) y las poliolefinas (PO) tales como el polietileno (PE) y el polipropileno (PP), son componentes mayoritarios de los residuos plásticos urbanos. Reciclarlos conjuntamente, evitando la separación pre...

La actividad agrícola actual enfrenta diversos desafíos: existencia de una limitada área de cultivo, demanda creciente de producción debido al aumento de la población mundial, necesidad de adecuación a climas adv...

Several mathematical models in SARS-CoV-2 have shown how the target cell model can help to understand the spread of the virus in the host and how potential antiviral treatments can help to control the virus. Concepts as ...