This paper studies the effect of two different parameters on the different fractions obtained in the catalytic pyrolysis of HDPE using HZSM-5. On one hand, the influence of the heating rate on the results obtained has been studied by selecting…

The harmonic balance method is used to construct approximate frequency–amplitude relations and periodic solutions to the relativistic oscillator. By combining linearization of the governing equation with the harmonic balance method, we construct analytical approximations to the oscillation frequencies and periodic…

A review of all known descriptions of immature stages of the species of the genera Scaeva Fabricius, 1805, Ischiodon Sack, 1913 and Simosyrphus Bigot, 1882 is presented using SEM illustrations. The third instar larval and/or pupal morphology of Scaeva dignota…

Despite the many health benefits, physical activity trends in females have been consistently reported to be lower than that of males. Other demographic variables may also be related to sport participation. The purpose of this study was to explore the…

Desalination of seawater has become an important and growing
industry due to the water shortage in some Mediterranean countries. This
activity may result in environmental impacts, mainly generated by the
discharge into the sea of the concentrate (brine) produced. Data…

Convergence properties are presented for Newton additive and multiplicative Schwarz (AS and MS) iterative methods for the solution of nonlinear systems in several variables. These methods consist of approximate solutions of the linear Newton step using either AS or MS…

El objetivo de este estudio teórico fue evaluar la adecuación conceptual,
la aplicabilidad y las propiedades métricas de las medidas de depresión empleadas en
la investigación con muestras de personas mayores españolas. Para ello se realizaron
búsquedas electrónicas en las…

Descripción completa.

A new analytical approximate expression for the period of the simple pendulum is obtained by using a heuristic but pedagogical derivation. This formula depends on two parameters obtained by comparing term-by-term the power-series expansions of the approximate and exact expressions…

This article provides information on an ongoing research in the field of Sport and Development. The aim of the whole research is to provide knowledge on the role of the football in the personal development of children in the context…