Fecal samples from the Siberian tiger (Panthera tigris altaica)
and the Amur cat (Felis bengalensis euptilurus) from Far Eastern
Russia, were examined for parasites. A natural sedimentation methodology
was used and a complete examination of all the sediment was
performed.…

Conformal symmetries in warped manifolds
(P. S., Apostolopoulos; Carot, Jaume.)

Abstract

The existence of a Conformal Vector Field (CVF) is studied in the important class
of warped manifolds of arbitrary dimension generalizing in this way the corresponding…

Although radix 10 based arithmetic has been gaining renewed importance over the last few years, decimal systems are not efficient enough and techniques are still under development. In this paper, an improvement of the CORDIC (coordinate rotation digital computer) method…

SUMARIO


Editorial.Vivas García, Mireya


DOSSIER: TIC y Educación.


Aplicaciones de la perspectiva cognitiva en la enseñanza a través de redes telemáticas.
Applications of a constructivist perspective to teaching through the web.
Applications de la…

Descripción completa.

In order to achieve a better understanding of the mechanisms of hologram formation and higher diffraction efficiencies in volume gratings stored in acrylamide based photopolymers, a crosslinker (N,N'methylene-bis-acrylamide) has been incorporated in the photopolymer to record holograms by pulsed laser…

In this work we study the effect of the glass substrate on the efficiencies of the different orders that propagate inside a transmission sinusoidal diffraction grating. Holographic optical elements are usually recorded on a photosensitive medium deposited on to a…

A continuación se describe una nueva especie de Anoura de los Andes de Ecuador, que se distingue de las demás especies de
Anoura por su forma de tubo alargado el labio inferior y la lengua mucho más tiempo.

Activated carbon/polyaniline composites have been prepared using different electrochemical methods: single-step potentiostatic polymerization, multiple-step potentiostatic polymerization, and potentiodynamic polymerization with the anodic potential limits being fixed at either 0.75 or 1 V (vs Ag/AgCl). The prepared composite samples were characterized…

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…