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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.


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Journal ArticleDOI
TL;DR: A novel active power management methodology for over-voltage mitigation in active LV networks is proposed and shows that the application of the methodology increases SCR of installations, treating at the same time prosumers in a fairer way compared to existing methods.

36 citations

Journal ArticleDOI
TL;DR: In this paper, a series of Ce-Sm-xCu (x = 5, 7, and 10 at%) catalysts were prepared through coupling of microwave irradiation with a sol-gel method and were evaluated for the glycerol steam reforming reaction in the 400-750 °C temperature range.
Abstract: A series of Ce–Sm–xCu (x = 5, 7, and 10 at%) catalysts were prepared through coupling of microwave irradiation with a sol–gel method and were evaluated for the glycerol steam reforming reaction in the 400–750 °C temperature range. Some critical comparison with co-precipitation catalysts is also discussed. The catalysts were characterized using BET, Raman, XRD, NH3-TPD, CO2-TPD, H2-TPR, SEM, HAADF-STEM and XPS analyses, while the bonding environment and thermal stability of the catalyst precursor compounds were studied using FTIR and TGA/DSC. For all catalysts it was found that the Ce, Sm, and Cu cations are all homogeneously distributed in the cubic fluorite cell with interplanar spacings of 0.355 nm, 0.370 nm and 0.373 nm for the Ce–Sm–5Cu, Ce–Sm–7Cu and Ce–Sm–10Cu catalysts, respectively. The surface of the catalysts was found to be Ce- and Cu-poor and Sm-rich, with Ce4+, Ce3+, Sm3+, Cu2+ and Cu+ oxidation states identified. In the bulk, the oxygen vacancies were found to be dependent on the catalyst composition (Cu content). Among the catalysts studied, the Ce–Sm–5Cu one exhibits the highest selectivity for hydrogen (H2) with its SH2 ranging from 40% (400 °C) to 75% (750 °C). The Ce–Sm–5Cu catalyst also produces the highest amount of CO (97–71%) and the lowest amount of CO2 (3–28%) among all samples for the low reaction temperature range (400 °C 650 °C and reaches values of 7, 10 and 12 for the samples Ce–Sm–5Cu, Ce–Sm–7Cu, and Ce–Sm–10Cu, respectively. All the catalysts showed a glycerol conversion of 80% after 6 h time on stream, although a variety of coke species was found on their surfaces. A potential correlation between Cu content and coke deposition was attempted.

36 citations

Journal ArticleDOI
TL;DR: This work considers trigonometrically fitted two derivative explicit Runge-Kutta methods of the general case that use several evaluations of f and g per step and provides numerical results to demonstrate the efficiency of these methods using four test problems.
Abstract: Two derivative Runge-Kutta methods are Runge-Kutta methods for problems of the form y′ = f(y) that include the second derivative y″ = g(y) = f′(y)f(y) and were developed in the work of Chan and Tsai (Numer. Alg. 53, 171–194 2010). Explicit methods were considered and attention was given to the construction of methods that involve one evaluation of f and many evaluations of g per step. In this work, we consider trigonometrically fitted two derivative explicit Runge-Kutta methods of the general case that use several evaluations of f and g per step; trigonometrically fitting conditions for this general case are given. Attention is given to the construction of methods that involve several evaluations of f and one evaluation of g per step. We modify methods with stages up to four, with three f and one g evaluation and with four f and one g, evaluation based on the fourth and fifth order methods presented in Chan and Tsai (Numer. Alg. 53, 171–194 2010). We provide numerical results to demonstrate the efficiency of the new methods using four test problems.

34 citations

Journal ArticleDOI
TL;DR: In this article, the incidence and levels of pesticide residues in peaches grown using Integrated Crop Management (ICM) methods in Pella and Imathia, districts of Macedonia, Northern Greece, are presented.

33 citations

Journal ArticleDOI
TL;DR: In this article, an ideal balance between thermal and mechanical properties can be obtained at surfactant quantity equivalent to 1.5 times the clay cation exchange capacity (CEC).
Abstract: Composite materials consisting of poly(L-lactic acid) and montmorillonite modified to a different extent, using various contents of hexadecylammonium cation, were prepared by the solution intercalation method. Investigation of the composites' morphology revealed that a surfactant quantity higher than the mineral's cation exchange capacity (CEC) was necessary for the organomodified clay to be dispersed at nanoscale level into the polymer matrix. The surfactant content in organoclay was found to play a major role in controlling the composite's mechanical properties. Thus, although increase of the alkylammonium concentration initially enhanced these properties, even higher concentrations corresponding to higher modification levels had a negative impact to them causing their dramatic deterioration. Observation of the deformed surfaces showed that the deformation process mechanism of the material is directly related to the degree of clay modification. Thermal degradation studies revealed that the intermediate surfactant excess reinforces the thermal stability of the nanocomposite by increasing the onset decomposition temperature. Additionally, the alkylammonium concentration was found to affect the crystallization temperature and the glass transition temperature of the polymer. In conclusion, an ideal balance between thermal and mechanical properties can be obtained at surfactant quantity equivalent to 1.5 times the clay CEC. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers

32 citations


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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20221
202013
201955
201876
201794
201656