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Search Results: 1 - 10 of 1331 matches for " Nikolaos Chousidis "
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Effect of Organic Coating Corrosion Inhibitor on Protection of Reinforced Mortar  [PDF]
Evgenia Voulgari, Aggeliki Zacharopoulou, Nikolaos Chousidis, George Batis
Journal of Materials Science and Chemical Engineering (MSCE) , 2019, DOI: 10.4236/msce.2019.71003
Abstract: Corrosion of reinforced concrete is the most important cause of concrete structure deterioration. In the present study, the protective effect of the reinforcement mortars against corrosion is examined. In particular, the chloride penetration resistance on reinforced cement mortars using organic coating as additive containing was studied. The aforementioned additive consists of corrosion inhibitor for protection of steel rebars against pitting corrosion. For the experimental procedure, four (4) different types of reinforced mortars were prepared. The corrosion protection of the additive was evaluated by electrochemical methods, (linear polarization resistance, Half-cell Potential Resistance and Electrochemical Impedance Spectroscopy). In addition, the mass loss of steel rebars against time of partially immersed in NaCl solution was carried out in the lab. The experimental results showed that in all examined cases the organic coating provides anticorrosion protection on steel rebars against chlorides.
Anticorrosive Effect of Electrochemical Manganese Dioxide By-Products in Reinforced Concrete  [PDF]
N. Chousidis, E. Rakanta, I. Ioannou, G. Batis
Journal of Materials Science and Chemical Engineering (MSCE) , 2015, DOI: 10.4236/msce.2015.35002
Abstract: The present study investigates the effect of Electrochemical Manganese Dioxide (EMD) by-product as a replacement of cement, on durability of concrete and the corrosion protection of reinforcement steel. Reinforced cement mortars were partially immersed in 3.5% w. w NaCl solution and they were exposed to atmospheric conditions for a period of 24 months. Additions of 5% and 10% EMD byproduct were tested. The following techniques were used: half-cell potential measurements (HCP), linear polarization Resistance (LPR), mass loss of reinforcement steel, determination of carbonation depth of mortars, testing of compressive strength, total and open porosity measurements. Based on the up-to-now results of this study, the specimens with addition 10% appear smaller corrosion currents and mass loss of steel than reference specimens. Also, the compressive strength with 10% additive is appeared to be slightly higher from the reference specimens.
A Computational Comparison of Basis Updating Schemes for the Simplex Algorithm on a CPU-GPU System  [PDF]
Nikolaos Ploskas, Nikolaos Samaras
American Journal of Operations Research (AJOR) , 2013, DOI: 10.4236/ajor.2013.36048

The computation of the basis inverse is the most time-consuming step in simplex type algorithms. This inverse does not have to be computed from scratch at any iteration, but updating schemes can be applied to accelerate this calculation. In this paper, we perform a computational comparison in which the basis inverse is computed with five different updating schemes. Then, we propose a parallel implementation of two updating schemes on a CPU-GPU System using MATLAB and CUDA environment. Finally, a computational study on randomly generated full dense linear programs is preented to establish the practical value of GPU-based implementation.

Letter to the Editor: Postoperative Rhinorrhea without Intraoperative Cerebrospinal Fluid Leak after Endoscopic Transnasal Transphenoidal Surgery for Pituitary Macroadenomas  [PDF]
Nikolaos Gkekas, Panagiotis Primikiris, Nikolaos Georgakoulias
Open Journal of Modern Neurosurgery (OJMN) , 2014, DOI: 10.4236/ojmn.2014.41008
Abstract: Postoperative Rhinorrhea without Intraoperative Cerebrospinal Fluid Leak after Endoscopic Transnasal Transphenoidal Surgery for Pituitary Macroadenomas
Depicting Determinants and Effects of Intimacy and Verbal Aggressiveness Target through Social Network Analysis  [PDF]
Nikolaos Hasanagas, Alexandra Bekiari
Sociology Mind (SM) , 2015, DOI: 10.4236/sm.2015.53015
Abstract: Aim of this research is to suggest determinants and effects of intimacy (including also its extreme forms such erotic relation or life-partnership), measured in term of its effect, attraction, as well as to analyze relations between attraction and verbal aggressiveness. Complete social network analysis has been conducted in a class of students of Physical Education Department, University of Thessaly (N = 53). The data were collected with standardized questionnaires. Network analysis software (Visone) as well as cross-sectional analysis (SPSS) has been implemented. The results are: Attractiveness is gender-specific, as it is connected with male students. Younger students tend to be more attractive in physical appearance and dressing. The mother’s pedagogic influence becomes evident on the attractiveness of someone for life-partnership. The academic conformity is not conducive to the development of pleasant discussions. Spending money for entertainment and impressing try to outweigh attractive physical appearance. Being aware of preference for durable erotic relation strengthens self-confidence. A companionship seems to be of socio-intellectual or of emotional-sexual nature. Attractiveness seems to lead to verbal aggression. It seems also to reduce the tendency to escape to imaginary sceneries. Physical dimension appears to be stronger than mental parameters for maintaining a durable erotic relation. The desire for life-partnership without children appears to be favored by mental elements. Verbal-aggressors search for targets without meticulously examining weaknesses and strengths on each person. Distinct types of attractiveness are also detected, corresponding to the following patterns: general sociability (“friend”) which is also connected with mild (narcissistic) exploitation, erotic relation (“erotic”) which is an autonomous value system based on superficial criteria related to appearance, focusing on communication (“distant communicable”), being an idol (“fully narcissistically exploitable”) without any reality basis, and life-long occupation of a person (“life-long exploitable”).
Models of Tax Planning Simulation: The Case of Greece  [PDF]
Nikolaos Varotsis, Ioannis Katerelos
Open Journal of Modelling and Simulation (OJMSi) , 2018, DOI: 10.4236/ojmsi.2018.63003
Abstract: This paper highlights the timeless failure of the tax system in Greece despite its continuous reform, addressing the study of tax evasion phenomenon with a different approach. The study aims to identify socio-psychological characteristics and attitudes that affect the study of tax behavior using the mathematical research of linear models for tax policy and to assess tax behavior with simulation models, where state reform, tax reform and fiscal restructuring—along with social consensus, transparency and fair taxation—are control parameters. The survey involved 320 taxpayers from the entire Greek territory. Mathematical study using linear analysis showed that a linear model integrates fiscal, social and psychological factors are significantly better in representing tax behavior, lowering tax evasion. Specifically, a main futures model is bettering the tax behavior (R2 = 0.237) improving the tax revenues. These results plainly infer the conclusion that tax behavior in Greece might affected by fiscal, social and psychological factors.
On Neumann hemivariational inequalities
Halidias Nikolaos
Abstract and Applied Analysis , 2002, DOI: 10.1155/s1085337502000787
Abstract: We derive a nontrivial solution for a Neumann noncoercivehemivariational inequality using the critical point theory forlocally Lipschitz functionals. We use the Mountain-Pass theoremdue to Chang (1981).
Elliptic problems with nonmonotone discontinuities at resonance
Halidias Nikolaos
Abstract and Applied Analysis , 2002, DOI: 10.1155/s1085337502203061
Abstract: Using the critical point theory of Chang (1981) for locallyLipschitz functionals, we prove an existence theorem for someelliptic problems at resonance with no Carathéodory forcingterm.
Unilateral boundary value problems with jump discontinuities
Nikolaos Halidias
International Journal of Mathematics and Mathematical Sciences , 2003, DOI: 10.1155/s0161171203013279
Abstract: Using the critical point theory of Szulkin (1986), we study elliptic problems with unilateral boundary conditions and discontinuous nonlinearities. We do not use the method of upper and lower solutions. We prove two existence theorems: one when the right-hand side is nondecreasing and the other when it is nonincreasing.
Theoretical results for top quark production
Kidonakis, Nikolaos
High Energy Physics - Phenomenology , 2013,
Abstract: I discuss and compare several approaches to higher-order calculations of top quark production. I study the relative effectiveness of the approaches in approximating the exact NNLO results for the top-pair total cross section and highlight the theoretical and numerical differences between them. I show that the results from my soft-gluon resummation method are nearly identical to the exact NNLO cross section at all LHC and Tevatron energies. This agreement has important consequences for the validity of existing approximate NNLO differential distributions, for further refinements of the predictions, and for applications to other processes such as single-top production. I also compare approximate NNLO top quark transverse momentum and rapidity distributions with recent LHC measurements.
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