We develop preconditioners for systems arising from finite element discretizations of parabolic problems which are fourth order in space. We consider boundary conditions which yield a natural splitting of the discretized ...

This work consists on the study of two important problems arising from the operations of petroleum and natural gas industries. The first problem the pipe dimensioning problem on constrained gas distribution networks ...

The supply of natural gas is generally based on contracts that are signed prior to the use of this fuel for power generation. Scarcity of natural gas in systems where a share of electricity demand is supplied with gas ...

Semiology Presentation Register, applying theory to Mathematics teaching-learning process. This paper aimed to check whether there was a better student performance after Semiology Presentation Register being applied to ...

Semiology Presentation Register, applying theory to Mathematics teaching-learning process. This paper aimed to check whether there was a better student performance after Semiology Presentation Register being applied to ...

El Elemento Natural Destacado Sistema Espeleolacustre (SEL) está ubicado en la porción centro oriental de la Península de Zapata, en la región sur-oriental del Municipio Ciénaga de Zapata, Provincia Matanzas. Esta región ...

The purpose of this qualitative study was to analyze the difficulties presented by 7th grade elementary students, in addition and subtraction of Integers. Two instruments were used to collect data, one involving problems ...

We solve the Bjorling problem for timelike surfaces in the Lorentz-Minkowski space through a split-complex representation formula obtained for this kind of surface. Our approach uses the split-complex numbers and natural ...