Favvas E.P.,Greek National Center For Scientific Research |
Favvas E.P.,Eastern Macedonia and Trace Institute of Technology |
Stefanopoulos K.L.,Greek National Center For Scientific Research |
Mitropoulos A.C.,Eastern Macedonia and Trace Institute of Technology |
Kanellopoulos N.K.,Greek National Center For Scientific Research
Microporous and Mesoporous Materials | Year: 2015
In situ small-angle X-ray scattering (SAXS) measurements, with the aid of a specially-designed cell, have been carried during CH2Br2 adsorption on MCM-41. Ordered mesoporous silicas consist of a 2D hexagonal array of cylindrical mesopores of uniform size. As a result, they exhibit Bragg peaks because of the regular packing of the cylindrical pores. Dibromomethane was selected as a contrast-matching fluid because it has almost the same electron density as silica. The SAXS patterns provide information about both the structural properties of MCM-41 and the adsorption mechanism. The power law observed in the low-Q regime can be ascribed to intergrain interfacial scattering. The intensity decrease and the elimination of the Bragg peaks for the saturated sample suggested that an almost perfect contrast matching was achieved. Finally, information about the growing thickness of the adsorbed film was obtained by analyzing the integrated intensities of the diffraction peaks with a structural model consisting of infinitely long concentric cylindrical shells with four levels of electron density. © 2014 Elsevier Inc.
Karakoulidis K.,Eastern Macedonia and Trace Institute of Technology
Journal of Engineering Science and Technology Review | Year: 2015
The current work deals with appropriate selection of electric motors for forging fly-press machines. To solve the equation of motion of the electric drive of these mechanisms characterized by impact (pulsating) load and presence of flywheel, numerical methods (calculus) have been used. © 2015 Kavala Institute of Technology.
Koleva D.,Technical University of Gabrovo |
Kogias P.,Eastern Macedonia and Trace Institute of Technology
Journal of Engineering Science and Technology Review | Year: 2016
In this article they are investigated the problems associated with the measuring of user load in the network versus time and type of equipment. Among these they are presented also practical researches concerning the behaviour of various analytical models used to describe the interaction between the base and mobile stations. The aim is to make proper planning of the network for providing quality services and the necessary traffic in it.