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.

A Symplectic Trigonometrically Fitted Modified Partitioned Runge‐Kutta Method for the Numerical Integration of Orbital Problems

Abstract: The numerical integration of Hamiltonian systems by symplectic modified partitioned Runge-Kutta methods with the trigonometrically fitted property is considered in this paper. We construct new symplectic modified Runge-Kutta method of second order with the trigonometrically fitted property. We apply our new method as well as other existing methods to the numerical integration of the harmonic oscillator, the two dimensional harmonic oscillator, the two-body problem and an orbit problem studied by Stiefel and Bettis. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

PM10, O3, CO Concentrations and Elemental Analysis of Airborne Particles in a School Building

Abstract: Measurements of indoor and outdoor PM10, as well as indoor O3 and CO concentrations were conducted and are presented here. These measurements were carried out at an institute building, located in a suburban industrial area in Greece. Both indoor and outdoor PM10 samples were also collected and their elemental composition was identified by ED-XRF analysis. Twenty seven major, minor and trace elements were identified. The measurements took place generally in different periods of institute operation, from June 2004 to February 2005. The indoor PM10 concentrations which were measured during the normal operation period of the institute were found to be many times higher than the respective outdoor PM10 concentrations of the same periods. On the contrary, the indoor PM10 concentrations which were measured during the holiday period were found to be lower than their corresponding outdoor values. Indoor O3 and CO concentrations were found to be in low level. Indoor PM10 concentrations were found to be in a relative good correlation with O3 (r = 0.45) and in high correlation (r = 0.98) with CO concentrations. On average, total elements concentrations were much higher indoors relative to outdoors. Based on above findings we attempted to determine the pollution sources of the indoor environment and to investigate some parameters or chemical processes that affect indoor pollutants’ levels.

Impact of penetration schemes to optimal DG placement for loss minimisation

Abstract: This paper examines the impact of different penetration schemes to the optimal distributed generation placement problem for loss minimisation. The four variables of the problem are presented and a concept based on degrees of freedom (DoF), representing the number of the variables that undergo any kind of limitation during the solution process, is introduced. Four commonly utilised penetration schemes subject to various limitations are examined and compared with a fifth penetration scheme, which is unconstrained and is proposed as the optimal one. All schemes are implemented under a local-particle swarm optimisation-variant algorithm and applied on the IEEE 33 and IEEE 118 bus systems. The results indicate that the proposed penetration scheme with four DoF provides the optimal solution both in terms of loss minimisation and voltage profile improvement.

Dietary carob pods on growth performance and meat quality of fattening pigs.

Abstract: In this experiment the effect of dietary carob pods in the growth performance of fattening pigs and their meat quality, including steak chemical composition and fatty acid profile, were examined. A total of 160 weaning piglets, 30 days old, were allocated into four equal groups with 4 subgroups of 5 female and 5 males each. The animals were fed with isocaloric and isonitrogenous diets, containing either 0 or 75 or 100 or 125 g of carob pods per kg of feed. At the end of the experiment, on the 180 day of age, carcass subcutaneous fat thickness, steak chemical composition and steak fatty acid profile were determined. The results of the experiment showed that the dietary addition of 75 or 100 g/kg carob pods increased body weight at slaughter and carcass weight. No significant effect was noticed on the other examined carcass parameters. Consequently, carob pods could be suggested as a potential feed for fattening pigs without any adverse effect on their meat quality.

Ownership Structure in Greece: Determinants and Implications on Corporate Governance

Abstract: The paper analyzes ownership structure in Greece. Greece has the same characteristics as Spain, Italy, Portugal, and other countries that are ranked in the Continental Europe corporate governance system. Two measures of ownership concentration are used. The first is the sum of equity holdings of the five biggest shareholders, while the second is square of the first (Herfindahl Index). Determination of the factors that affect ownership structure is done using Panel Data Regression models. Stratifying variables, like law (before and after the enactment of the corporate governance law), sector (finan 144 cial or not), and index ranking were used. Two main hypotheses were tested: a) ownership structure is affected by quality of corporate governance and its mechanisms, financial performance, board of directors‘ structure and composition and finally firm‘s size, b) the factors that affect ownership concentration in a country like Greece are the same with the ones that literature specifies for the Anglo-Saxon countries. Overall, ownership concentration in Greece has different characteristics than the ownership structure in the Anglo-Saxon countries and creates a very different internal and external environment. Ownership structure is affected by the historical development of the firm, its organizational scheme and even more by the balance of power and control within the firm. Corporate governance quality and mechanisms as well as external factors, like the law, index ranking, and existence of an external market for corporate control do not seem to have any significant effect on ownership structure.