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Search Results: 1 - 10 of 520 matches for " Stavros Michailos "
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Simulation of Olive Kernel Gasification in a Bubbling Fluidized Bed Pilot Scale Reactor  [PDF]
Stavros Michailos, Anastasia Zabaniotou
Journal of Sustainable Bioenergy Systems (JSBS) , 2012, DOI: 10.4236/jsbs.2012.24021

The main aim of this study is to develop a comprehensive process model for biomass gasification in a pilot scale bubbling fluidized bed gasifier using the ASPEN PLUS simulator. A drawback in using ASPEN PLUS is the lack of a library model to simulate fluidized bed unit operation. However, it is possible for users to input their own models, using FORTRAN codes nested within the ASPEN PLUS input file, to simulate operation of a fluidized bed. The products of homogeneous reactions are defined by Gibbs equilibrium and reaction rate kinetics are used to determine the products of char gasification. Governing hydrodynamic equations for a bubbling bed and kinetic expressions for the char combustion were adopted from the literature. Different sets of gasification results for the operation conditions (temperature and air equivalence ratio (ER)) obtained from the our pilot-scale gasifier having a capacity of 1 kg/hr of olive kernel as feeding biomass, were used to demonstrate the validation of the model. The simulation results received from the application of the model were compared with the above experimental results and showed good agreement.

El "concierto sacro" del 19 de abril de 1810: 0 la conjura eclesiástica de Andrés Bello (1781-1865) The "Sacred Contriving" of April 19th, 1810: or the Ecclesiastical Conspiracy of Andrés Bello (1781-1865)
David Coifman Michailos
Revista musical chilena , 2012,
Abstract: El concierto sacro delJueves Santo, 19 de abril de 1810, marcó el inicio del movimiento independentista de Venezuela. La fecha no fue escogida al azar, sino que a propósito de las ventajas que la "función eclesiástica" de ese día proporcionaba para el control social y la difusión de la información en torno a los hechos políticos que se buscaba alcanzar. El presente ensayo se propone examinar la confluencia musical y eclesiástica (hasta ahora no estudiada) que habría sin duda sido necesaria establecer para el positivo resultado de esta empresa, supeditada a las redes sociales, musicales e intelectuales en torno al editor entonces de la Gazeta de Caracas, hijo del músico y abogado Bartolomé Bello (1758-1804), el humanista Andrés Bello (1781-1865). The sacred contriving on Maundy Thursday, April 19th, 1810, marked the beginning of the independence of Venezuela. The date was not chosen at random but on the basis ofthe advantages that the "ecclesiasticalfunction" had regarding both the social control and the dissemination ofthe information about the political goals to be achieved. The purpose ofthis essay is the analysis ofthe hitherto unknown confluence ofthe musical and ecclesiastical elements that made it possible this enterprise to succeed. These elements in turn are related to the social, intellectual and musical networks ofthe humanist Andrés Bello (1781-1865), editor ofthe Gazeta de Caracas and son ofthe musician and lawyer Bartolomé Bello (1758-1804).
Electromagnetic Wave Propagation into Fresh Water  [PDF]
Shan Jiang, Stavros Georgakopoulos
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2011, DOI: 10.4236/jemaa.2011.37042
Abstract: Wireless communications from air to fresh water are studied here. Our analysis relies on plane wave propagation mod-els. Specifically, the transmission loss and propagation loss of RF waves penetrating into fresh water are calculated for various propagation depths. Even though RF wireless communications are not well suited for seawater due to its high attenuation, our paper illustrates that RF communications from air to fresh water are possible. Finally, this work de-rives the optimum frequencies, which provide minimum attenuation and maximum propagation depth, for RF commu-nications from air to fresh water.
An Average Distance Based Self-Relocation and Self-Healing Algorithm for Mobile Sensor Networks  [PDF]
Yipeng Qu, Stavros V. Georgakopoulos
Wireless Sensor Network (WSN) , 2012, DOI: 10.4236/wsn.2012.411037
Abstract: The sensing coverage of a wireless sensor network is an important measure of the quality of service. It is desirable to develop energy efficient methods for relocating mobile sensors in order to achieve optimum sensing coverage. This paper introduces an average distance based self-relocation and self-healing algorithm for randomly deployed mobile sensor networks. No geo-location or relative location information is needed by this algorithm thereby no hardware such as GPS is required. The tradeoff is that sensors need to move longer distance in order to achieve certain coverage. Simulations are conducted in order to evaluate the proposed relocation and self-healing algorithms. An average of 94% coverage is achieved in the cases that we are examined with or without obstacles.
Sonographic evaluation of solid breast nodules
T Stavros
Breast Cancer Research , 2004, DOI: 10.1186/bcr822
Abstract: These studies show that sonography is useful in the characterization of solid breast masses. Characterizing solid breast nodules into BIRADS categories defines carcinomas that might have been missed clinically or mammographically. It identifies a BIRADS 3 group that has far less than 2% risk of being malignant and can offer the patient the option of follow-up rather than biopsy. Currently, approximately 80% of patients with BIRADS 3 solid nodules are electing to be followed rather than to undergo biopsy. It improves the accuracy of the diagnosis of malignant breast lesions. Importantly, it also accurately defines a population of benign solid breast lesions that do not require biopsy when strict sonographic criteria of benignity are present.To achieve the desired sensitivity and negative predictive values of 98% or greater the algorithm must be strictly adhered to. When the patient elects to be followed rather than undergo biopsy, follow-up should be performed in 6 months, not 1 year. The malignant lesions at most risk to be mischaracterized as BIRADS 3 are higher grade invasive ductal carcinomas that grow rapidly enough for change to be readily detected at 6 months.
Comparing the Probability of Unemployment in Southern Greece Vis-à-Vis the Entire Country
Stavros Rodokanakis
Bulletin of Geography. Socio-economic Series , 2009, DOI: 10.2478/v10089-009-0002-5
Abstract: The basic aim of this paper is to investigate the impact that educational level of individuals and participation in training programmes (apprenticeship, intra-firm training, continuing vocational training, popular training) have on their job prospects in Southern Greece (namely the regions of Southern Aegean and Crete) during the implementation of the first Community Support Framework (1989-1993). We also research the differences between the two regions under study and the entire country. We try to see whether the educational level itself and participation in training programmes increased the chances of finding a job. More specifically, we research what are the social and demographic characteristics that increase the chances of someone in the examined population finding a job, how those chances change (if they do) after the introduction of training courses and, also, whether University graduates, in contrast to most of the rest of the EU member states, face greater difficulties in finding a job than non-University graduates, as a series of studies for Greece conclude. To the author's knowledge, this is the first attempt to analyse individual anonymised records (micro-data) from the Labour Force Survey (LFS) for both employed and unemployed in those two regions at NUTS 2 level.
Stress amplification in three-dimensional narrow zones created by cavities
Syngellakis Stavros
Theoretical and Applied Mechanics , 2012, DOI: 10.2298/tam1201071s
Abstract: The paper is concerned with a particular case of stress amplification arising from the proximity of a spherical cavity to the boundary of a loaded elastic solid. The performed approximate analysis yields distributions of stresses and displacements in the narrow region formed between a spherical cavity and the faces of a thin flat layer subjected to a far field uniform radial tension. The narrow region is modelled as a circular plate of non-uniform thickness undergoing coupled membrane and flexural deformation. Series solutions are obtained for both membrane forces and bending moments leading to estimates for the stress concentration factor at minimum thickness. These predictions are found consistent with those obtained from both the exact analytical solution and finite element modelling of the problem. Cross-validated results from the two latter methods also provide trends for the stress amplification due to the narrowness of the region.
A contribution to the study of the "Athonite" church type of byzantine architecture
Mamaloukos Stavros
Zograf , 2011, DOI: 10.2298/zog1135039m
Abstract: The recent study of the history and architecture of the Vatopedi monastery’s katholikon, initially built as a cross-insquare - composite four-column type church with lateral apses (“choroi”) and a two-storey narthex, can serve as a secure base for the study of the so-called “Athonite” church type, which in all likelihood had been already completely formed in Constantinople or in the area under its infl uence, before its architectural plan was applied on Athos.
Unemployment in Greece: Econometric Evidence after the Athens 2004 Olympics and before the Global Financial Crisis of 2007–2009
Stavros Rodokanakis
ISRN Economics , 2012, DOI: 10.5402/2012/619602
Microbial Competition in Bioreactors
Stavros Pavlou
Chemical Industry and Chemical Engineering Quarterly , 2006,
Abstract: n/a
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