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: Catalysis & Symplectic geometry. 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.

The free (open) boundary condition (FBC) in viscoelastic flow simulations

Abstract: The Free (or Open) Boundary Condition (FBC, OBC) was proposed by Papanastasiou et al. (A New Outflow Boundary Condition, Int. J. Numer. Meth. Fluids, 1992; 14:587–608) to handle truncated domains with synthetic boundaries where the outflow conditions are unknown. In the present work, implementation of the FBC has been extended to viscoelastic fluids governed by explicit differential constitutive equations. As such we consider here the Criminale-Ericksen-Filbey (CEF) model, which also reduces to the Second-Order Fluid (SOF) for constant material parameters. The Finite Element Method (FEM) is used to provide numerical results in simple Poiseuille flow where analytical solutions exist for checking purposes. Then previous numerical results are checked against Newtonian highly non-isothermal flows in a 4:1 contraction. Finally, the FBC is used with the CEF fluid with data corresponding to a Boger fluid of constant material properties. Particular emphasis is based on a non-zero second normal-stress difference, which seems responsible for earlier loss of convergence. The results with the FBC are in excellent agreement with those obtained from long domains, due to the highly convective nature of viscoelastic flows, for which the FBC seems most appropriate. The FBC formulation for fixed-point (Picard-type) iterations is given in some detail, and the differences with the Newton–Raphson formulation are highlighted regarding some computational aspects.

Biomass district heating methodology and pilot installations for public buildings groups

Abstract: The objective of the paper is to show how locally available biomass can support a small-scale district heating system of public buildings, especially when taking into account energy audit in-situ measurements and energy efficiency improvement measures. The step-by-step methodology is presented, including the research for local biomass availability, the thermal needs study and the study for the biomass district heating system, with and without energy efficiency improvement measures.

Web Candidates in the 2002 Greek Prefecture Elections

Abstract: This paper attempts to analyze the web sites of party candidates in the October 2002 prefecture elections in Greece. Candidate web sites regarding the 2002 prefecture elections are analyzed in terms of their political content, level of interactivity, use of multimedia techniques and level of professional appearance in their web campaign. Findings reveal that candidates are likely to present personal and political information on the web, without making negative statements regarding their opponents, make limited use of interactivity and multimedia techniques and rely less on professional web experts and more on the enthusiasm of volunteers or friends. The Greek prefecture election systems allow us also to make some tentative remarks about the impact of web campaigns in elections, comparing results between candidates with and without web sites in the second round of elections, where only two are the competitors.

The Annual Demand for Seasonal Immigrant Labor in Greece and its Influence on the Entrance of Albanian Workers

Abstract: The paper investigates the annual inflow of legal immigrants in Greece the last 6 years, 2005–2010, on the basis of the demand of Greek employers for seasonal immigrant labor in provenance from non-European Union countries. This process is determined by the new legislative framework described by the Law 3386/2005 on the entrance, accommodation and social integration of third-country nationals in the Greek territory. Every year Greek authorities determine the maximum number of residence and work permits that will be given to non-EU immigrants. Permits concern mainly seasonal jobs and profited basically to Albanian workers. Local needs for work determine the number of immigrants on the local level. Local demand is expressed through prefectures (Greece is divided administratively in 54 prefectures). The local needs determine the national demand, and therefore the annual inflow, for legal economic immigrants from non-EU countries. The paper analyses the evolution of this demand and tries to explain the factors that influence this evolution; are they mainly structural or they are related to economic activity? The analysis is based on a prefectural level because it permits a more qualitative approach of the evolution since we can have a more specific result. It appears that some prefectures, especially at the region of Central Macedonia, concentrate the main part of the annual demand for seasonal workers from third countries, basically Albanian workers. This demand is oriented to land workers, mainly for agricultural work. It appears that unemployment has only limited influence on this demand.

Bilateral trade and tourism relations between the EU and BSEC countries

Abstract: The European Union and the Black Sea Economics Cooperation countries are geographical neighbors and important trade partners. Greece, Bulgaria and Romania have a cross-membership in both organizations. The paper analyzes trends and structure of trade relations of the EU and BSEC countries. The EU trade with the 12 BSEC countries is about 640 billion dollars. The BSEC countries with the EU membership or a custom union with the EU have more intra-industry trade with the EU than other BSEC countries. International tourism is an important component of the trade in services between the regions. Following the review of the factors of international tourism demand, a gravity model for tourism arrivals is presented. The model considers demand in the country of origin, international tourism capacities in destination countries and distance. The analysis helps to determine under-traded and competitive destinations in the BSEC countries for the EU travelers. Greece is the most efficient in attracting the EU tourists. Finally, country-specific differences in demand factors are considered.