Technological Educational Institute of Western Macedonia

About: Technological Educational Institute of Western Macedonia is a based out in . It is known for research contribution in the topics: Symplectic geometry & Numerical integration. The organization has 291 authors who have published 522 publications receiving 7682 citations. The organization is also known as: TEI of West Macedonia & TEI of Western Macedonia.

Exponentially fitted symplectic methods for the numerical integration of the Schrödinger equation

Abstract: The computation of the energy eigenvalues of the one-dimensional time-independent Schrodinger equation is considered. Exponentially fitted and trigonometrically fitted symplectic integrators are obtained, by modification of the first and second order Yoshida symplectic methods. Numerical results are obtained for the one-dimensional harmonic oscillator and Morse potential.

Effect of Nanoclay Hydrophilicity on the Poly(lactic acid)/Clay Nanocomposites Properties

Abstract: In order to improve poly(lactic acid) (PLA) mechanical, thermal, and barrier properties, different layered silicate nanoclays are added. This work deals with the study of the effect of the type of nanoclays with different hydrophilicity on the preparation procedure and properties of PLA nanocomposites. Six kinds of clays have been loaded in PLA whose hydrophilicity varies in the following order of increased hydrophilicity: modified Dellite 67G (67G) < Cloisite 15A (C15A) < C20A < C93A < C30B < hydrophilic smectite clay (HPS). Resultant nanocomposites have been characterized both with respect to bulk and surface properties by mechanical, rheological, thermal analyses, X-ray diffraction study, Fourier transform infrared spectroscopy, gas permeability tests, contact angle measurements, scanning electron microscopy, and atomic force microscopy. Antimicrobial properties have been also tested. Evidenced was the dependence of most properties on the hydrophilicity/hydrophobicity of the clays. The nanocomposites c...

Trigonometrically fitted and exponentially fitted symplectic methods for the numerical integration of the Schrödinger equation

Abstract: The solution of the one-dimensional time-independent Schrodinger equation is considered by exponentially fitted symplectic integrators. The Schrodinger equation is first transformed into a Hamiltonian canonical equation. Numerical results are obtained for the one-dimensional harmonic oscillator and the doubly anharmonic oscillator.

A methodological framework for end-of-life management of electronic products

Abstract: A growing number of regulatory interventions such as the European Union's Extended Polluter Responsibility Policy hold manufacturers accountable for the damage inflicted to the natural environment by their products However, not all components of an industrial product have an equitable role regarding their overall burden to the environment In this context, it is of great interest to manufacturers to identify and rank those components with the highest potential value at the end of their useful life, employing an array of economical and environmental criteria In order to assist manufacturers on their decision-making for the optimal end-of-life alternatives for their products, the “Multicriteria Matrix” methodology has been developed The methodology relies on multicriteria analysis and takes into consideration the residual value, environmental burden, weight, quantity and ease of disassembly of each component With the developed methodology only those components that do not have any residual value end up in landfills, while the majority of the components are either reused or recycled The application of the developed methodology is demonstrated employing a real-world case study; that of an ISDN network terminal Finally, the paper is concluded by presenting interesting managerial insights that were obtained

Glycerol Steam Reforming for Hydrogen Production over Nickel Supported on Alumina, Zirconia and Silica Catalysts

Abstract: The aim of the work was to investigate the influence of support on the catalytic performance of Ni catalysts for the glycerol steam reforming reaction Nickel catalysts (8 wt%) supported on Al2O3, ZrO2, SiO2 were prepared by the wet impregnation technique The catalysts’ surface and bulk properties, at their calcined, reduced and used forms, were determined by ICP, BET, XRD, NH3-TPD, CO2-TPD, TPR, XPS, TEM, TPO, Raman, SEM techniques The Ni/Si sample, even if it was less active for T <600 °C, produces more gaseous products and reveals higher H2 yield for the whole temperature range Ni/Zr and Ni/Si catalysts facilitate the WGS reaction, producing a gas mixture with a high H2/CO molar ratio Ni/Si after stability tests exhibits highest values for total (70%) and gaseous products (45%) glycerol conversion, YH2 (25), SH2 (80%), SCO2 (65%), H2/CO molar ratio (60) and lowest values for SCO (31%), SCH4 (31%), CO/CO2 molar ratio (048) among all samples The contribution of the graphitized carbon formed on the catalysts follows the trend Ni/Si (I D /I G = 134) < Ni/Zr (I D /I G = 108) < Ni/Al (I D /I G = 088) and indicates that the fraction of different carbon types depends on the catalyst’s support nature It is suggested that the type of carbon is rather more important than the amount of carbon deposited in determining stability It is confirmed that the nature of the support affects mainly the catalytic performance of the active phase and that Ni/SiO2 can be considered as a promising catalyst for the glycerol steam reforming reaction