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Search Results: 1 - 10 of 1303 matches for " Georgios Fessakis "
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Wikipedia uses in learning design: A literature review
Georgios Fessakis,Maria Zoumpatianou
Themes in Science and Technology Education , 2012,
Abstract: This paper is a literature review report concerning educational uses of Wikipedia in the first 10 years of its existence. The aim of the work is the tracing and the presentation of published and validated educational applications of Wikipedia in a manner that could inform learning design by teachers or researchers. For the review, 24 scientific publications, retrieved from research databases and concerning educational applications of Wikipedia were analyzed. The review reveals a variety of learning uses of Wikipedia in several contexts, knowledge fields, education level and students’ ages. In addition, the study shows a variety of expected learning outcomes and a pleiad of student tasks in the learning activities. Both, the learning outcomes and the students’ tasks are organized in general types with the aim of constituting patterns for new learning designs. The findings are commented and possible future directions of research are described.
Pedagogical beliefs and attitudes of computer science teachers in Greece
Georgios Fessakis,Tsampika Karakiza
Themes in Science and Technology Education , 2011,
Abstract: Pedagogical beliefs and attitudes significantly determine the professional skills and practice of teachers. Many professional development programs for teachers aim to the elaboration of the pedagogical knowledge in order to improve teaching quality. This paper presents the study of pedagogical beliefs of computer science teachers in Greece. The research data reveal that computer science teachers usually hold mixed traditional and constructivist theories which are generally irrelevant to either demographic factors or their pedagogical training. In some cases statistically significant correlations to the educational level or the total teaching service are detected. The results of the study set out suggestions concerning the design of pedagogical training programs.
ErbB Receptors and ErbB Targeted Therapies in Endometrial Cancer  [PDF]
Georgios Androutsopoulos, Georgios Michail, Georgios Adonakis, Georgios Decavalas
Journal of Cancer Therapy (JCT) , 2014, DOI: 10.4236/jct.2014.56055

The Epidermal Growth Factor system is present in human organs and plays an important role in cell proliferation, differentiation and apoptosis during embryogenesis and postnatal development. It has four receptors (EGFR, ErbB-2, ErbB-3 and ErbB-4) and numerous ligands. Dysregulation of the Epidermal Growth Factor signaling network is implicated in the pathogenesis of various disorders. Especially in cancer, the Epidermal Growth Factor system becomes hyperactivated with various mechanisms (ligand overproduction, receptor overproduction, constitutive receptor activation). EGFR overexpression may have a dual role in endometrial cancer. It seems that in type I endometrial cancer, EGFR overexpression did not affect disease progression. However in type II endometrial cancer, EGFR overexpression associated with high grade disease and adverse clinical outcome. Moreover ΕrbB-2 overexpression especially in type II endometrial cancer, is an indicator of a highly aggressive disease with poor overall survival. The potential role of ErbB receptors (especially EGFR and ErbB-2) as targets for cancer therapy has been investigated for over 20 years. There are 2 major classes of ErbB targeted therapies: anti-ErbB monoclonal antibodies (MoAbs) and ErbB-specific tyrosine kinase inhibitors (TKIs). ErbB targeted therapies have still shown modest effect in unselected endometrial cancer patients. However, they may be clinically active as adjuvant therapy in well-defined subgroups of type II endometrial cancer patients with EGFR and ErbB-2 overexpression.

Liquid Column Deformation and Particle Size Distribution in Gas Atomization  [PDF]
Georgios S. E. Antipas
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.22012
Abstract: A water-gas flow injected by a close coupled atomizer was studied via High Speed Photography and Phase Doppler Anemometry. The formation of a wave disturbance on the surface of the water column was confirmed. The flow converged within an area approximately 3 mm in diameter, independent of atomization conditions. The particle size distribution across the spray suggested a trend of decreasing particle sizes and particle velocities with increasing distance from the spray axis of symmetry.
Ore Microscopy and Microanalysis of the Nickeliferous Iron Ores from Komnina Vermion Area (N.W. Greece)  [PDF]
Georgios Alevizos, Eftychia Repouskou
Geomaterials (GM) , 2011, DOI: 10.4236/gm.2011.12008
Abstract: Nickel laterites are considerable sources of nickel. To be successfully exploited it is important to know the mineralogical and microstructural characteristics of the ore. Besides, the identification of the mineralogical components as well as the fabric description, can lead to the interpretation of the mechanism of deposit genesis. The aim of the present study is the microscopic and microanalytical investigation of the Fe-Ni ores from Komnina Vermion area (N.W. Greece). The mineralogical composition of the ore is mainly hematite, quartz, chromite and chlorite, while in minor quantities goethite, nickeliferous chlorite, serpentine, talc and calcite are also present. The ore structure is allotriomorphic inequigranular and the texture is oolitic-pisolitic. According to microscopic examination the deposit can be registered as a secondary pseudo-autochthonous.
The Transmission Channels between Financial Sector and Real Economy in Light of the Current Financial Crisis a Critical Survey of the Literature  [PDF]
Georgios L. Vousinas
Modern Economy (ME) , 2013, DOI: 10.4236/me.2013.44028

The present study undertakes a critical review of the research around the major issue of the transmission channels between financial sector and real economy. The aim of the study is to shed light on the interaction between the financial system and the economy, in the shadow of the current crisis. The literature documents the importance of these channels in the determination of economic activity and therefore, real economy as a whole. The study highlights the emergence of the liquidity channel as a key factor of the transmission of bank credit shocks to real economy and underlines the existing “regulation gaps”. The paper concludes that the financial sector plays an even more crucial role these days and drastic measures along with intense supervision must be undertaken so as to work properly and serve the economic world.

Eurasian Economic Community: Towards Integration. Economic Challenges and Geostrategic Aspects  [PDF]
Georgios L. Vousinas
Modern Economy (ME) , 2014, DOI: 10.4236/me.2014.59088

The present study deals with Eurasian Economic Community (EurAsEC), a relatively new entity that appeared in the post-Soviet region, which tries to join the neighboring countries into a strong and structured union. The paper presents the integration steps that have been taken so far and examines the economic challenges faced as well as the geostrategic aspects. A comparison with the benchmark of the surrounding area, the European Union, is also undertaken in order to investigate both the similarities and differences among them and show if they could co-exist in the years to come. The main purpose of this study is to examine the reasons for the union’s formation, shed light on its economic prospects and highlight the newly established geostrategic conditions in such a crucial territory of the world.

Trends in Central Bank Transparency  [PDF]
Georgios Oikonomou, Eleftherios Spyromitros
Theoretical Economics Letters (TEL) , 2017, DOI: 10.4236/tel.2017.77142
Abstract: In this paper we have updated Central Bank Transparency Index from 2011 to 2016, following the methodology of Eijffinger and Geraats (2006) [1]. Then, we break down the index’s aspects and we analyze which are more likely to be changed through time. This, in respect to the annual data we have collected, makes clearer how the recent financial crisis has affected the Central Banks’ transparency trend and offers interesting insights for monetary policy transmission. Also, we divided the countries into developed, emerging and frontiers, as there is difference in their indexes changes, probably related to their economic and financial development.
Strong Electric Field in 2D Graphene: The Integer Quantum Hall Regime from a Different (Many-Body) Perspective  [PDF]
Georgios Konstantinou, Konstantinos Moulopoulos
Advances in Materials Physics and Chemistry (AMPC) , 2018, DOI: 10.4236/ampc.2018.81003
Abstract: We investigate the emerging consequences of an applied strong in-plane electric field on a macroscopically large graphene sheet subjected to a perpendicular magnetic field, by determining in exact analytical form various many-body thermodynamic properties and the Hall coefficient. The results suggest exotic possibilities that necessitate very careful experimental investigation. In this alternate form of Quantum Hall Effect, non-linear phenomena related to the global magnetization, energy and Hall conductivity (the latter depending on the strengths of magnetic B- and electric E-fields) emerge without using perturbation methods, to all orders of E-field and B-field strengths. Interestingly enough, when the value of the electric field is sufficiently strong, fractional quantization also emerges, whose topological stability has to be verified.
Global Production Estimation of Rare Earth Elements and Their Environmental Impacts on Soils  [PDF]
Georgios Charalampides, Konstantinos I. Vatalis
Journal of Geoscience and Environment Protection (GEP) , 2015, DOI: 10.4236/gep.2015.38007
Abstract: Due to high demand and limited availability of rare earth elements (REEs), Europe is unable to meet its industrial needs, especially High Tech needs, today for the manufacturing sector. Therefore, the EU has included them in the group of 14 critical minerals. China currently controls completely the mining activity, the enrichment technologies and metallurgy, and end-metal products of rare earths, resulting both Europe and the U.S.A. in full industrial dependency. The exploitation and wide use of REEs in fertilizers have led to accumulation of these elements in soils, resulting in an agriculture field pollution, which affects directly the soil microfauna with a toxic potential effect.
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