Christos D. Papageorgiou

Christos D. Papageorgiou
National Technical University of Athens | NTUA · Division of Electric Power

PhD IMPERIAL COLLEGE

About

62
Publications
12,164
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
533
Citations

Publications

Publications (62)
Article
Full-text available
Quantum mechanics Geometry generated potentials in Curved conducting wires strips or paths are related to various peculiar phenomena as exploding wires and exploding Li-ion batteries. The proposed theory can be used in the exploration of low energy nuclear transmutation devices. The origin of the so-called cold fusion is possible to be connected wi...
Article
Full-text available
The authors present a new method for determining the optical properties of arbitrary refractive index elliptical core fibres. The method applies the elliptic cylindrical coordinate system to Maxwell's equations and appropriately, using Fourier Transforms, operated on an elliptical core optical fibre waveguide, derives a flexible algorithm, which ca...
Article
Full-text available
We provide a very general review of the resonant transmission line method for optical fiber problems. The method has been found to work seamlessly for a variety of difficult problems including elliptical and eccentric core fibers as well as “holey” photonic crystal fibers. This new version has been shown to offer great versatility with respect to c...
Preprint
Full-text available
We provide a very general review of the resonant transmission line method for optical fiber problems. The method has been found to work seamlessly for a variety of difficult problems including elliptical and eccentric core fibers as well as “holey”, photonic crystal fibers. A latest version has been shown to offer great versatility with respect to...
Conference Paper
Full-text available
Curved linear antennas of arbitrary shape can be considered as a special case of quantum thin conducting wire traps of their free electrons and a numerical method is proposed for the calculation of their current distribution. In a case of low energy excitation with a proper frequency, only the fundamental mode with its lowest Eigen-value appears an...
Conference Paper
Full-text available
We present a particular class of solutions in Cartesian, cylindrical and spherical coordinates of the non-dispersive travelling wave variety that propagate an envelope of varying vorticity some of which include topological waves with parallel electric and magnetic components. The significance of these solutions is examined in the recently proposed...
Article
We present a particular class of solutions in Cartesian, cylindrical and spherical coordinates of the non-dispersive travelling wave variety that propagate an envelope of varying vorticity some of which include topological waves with parallel electric and magnetic components. The significance of these solutions is examined in the recently proposed...
Presentation
Is giving my research work on Quantum and Electromagnetism Phenomena, related to optics and to wire fragmentation Aiming in explaining the appeared Low Energy Nuclear Transmutations for Energy Applications.
Article
Full-text available
Experimental results of linear and curved conducting thin wires' disintegration under high power but low energy electrical discharges are reported. Microscopic origin of the anomalous energy release is traced into the lattice interaction with the strong transient radiation field causing the appearance of a strong Stark effect out of the polarizatio...
Conference Paper
Full-text available
The method of the transmission line is been applied to the case of cylindrical fibers whose refractive index is changing not only according to the distance from the core center but also according to the angle on the circle formed by the fiber cross section. The mathematical analysis provides relations that can be used to derive the fiber's mode pro...
Article
Full-text available
We present a new method for solving the Schrodinger equation using the Lossless Transmission Line Model (LTL). The LTL model although extensively used in fiber optics and optical fiber design, it has not yet found application in solid state problems. We develop the transformation theory mapping the wave equation to LTL and we apply the model to the...
Conference Paper
Full-text available
In several cases optical fibers in telecommunications have cores of non circular geometry. Fibre optic deformations appear in optical fibres for many reasons. Optical fibre core ellipticity for example where the fibre optic core is not perfectly circular due to fibre optic manufacturing tolerances, is measured and often is a problem. Optical fibre...
Article
The main problem associated with intermittent operation of the wind and PV power plants is the lack of low cost electrical storage methods. In the present paper a new type of solar chimney technology that we shall heretofore call “Enclosed Solar Chimney Power Plant technology (ESCP technology) stands for an effective alternative of combining both l...
Conference Paper
Full-text available
The calculation of mode propagation constants of elliptical core fibers has been the purpose of extended research leading to many notable methods, with the classic step index solution based on Mathieu functions. This paper seeks to derive a new innovative method for the determination of mode propagation constants in single mode fibers with elliptic...
Article
Full-text available
Solar chimney technology is a very promising solar thermal electricity generating technology. Solar chimney power plants have three major parts. A large greenhouse, a tall cylinder in the center of the greenhouse named solar chimney and an air turbine inside the solar chimney, geared to appropriate electric generators. Floating Solar Chimney (FSC)...
Article
Full-text available
Floating Solar Chimney (FSC) technology is a low cost alternative technology to solar updraft tower technology which is using concrete solar chimneys. Floating Solar Chimneys are lighter as air fabric structures and can be as high as 700m, giving to their respective power plants efficiency up to 0.85 %. The axial shrouded air turbines of the FSC Po...
Article
We present experimental evidence for the appearance of strong forces inside the lattice of metallic conductors in the phase of transient excitation by a sequence of high power, high voltage but low energy electrical pulses.
Article
Full-text available
A novel method for ionic collisions is presented based on a theoretical analysis of the long-standing wire fragmentation problem. Based on a Maxwellian approach of the transient electrodynamic forces we deduce a theoretical formula of the effective tensile force. A number of conducted experiments with low energy capacitor bank discharges are also r...
Chapter
Full-text available
Although electricity generation is a major carbon dioxide producer we should notice that electricity can replace all the energy activities related to fossil fuelled technologies. Thus a solution to the global warming is possible if we succeed to generate zero emission clean electricity.
Article
Full-text available
In this article we present an alternative explanation of the phenomenon of wire fragmentation under high transient currents based on classical electromagnetism. We also explain how this phenomenon can be utilized as a primitive example of low energy-high power disruptive phenomena that can affect even nuclear matter.
Article
Full-text available
We extend a previously introduced model for finding eigenvalues and eigenfunctions of PDEs with a certain natural symmetry set based on an analysis of an equivalent transmission line circuit. This was previously applied with success in the case of optical fibers (8), (9) as well as in the case of a linear Schroedinger equation (10), (11) and recent...
Article
Full-text available
In this article we present an alternative explanation of the phenomenon of wire fragmentation under high transient currents based on classical electromagnetism. We also explain how this phenomenon can be utilized as a primitive example of low energy-high power disruptive phenomena that can affect even nuclear matter.
Chapter
Full-text available
The Floating Solar Chimney (FSC) Technology Power Plants, are made of three major components: • A large solar collector with a transparent roof that warms the air below it, due to the solar irradiation. • A tall lighter-than-air hollow cylinder placed in the center of the solar collector that is up-drafting the warm air, through its open top to the...
Conference Paper
Full-text available
A solar chimney power plant has three major components: (1) A circular solar collector (Greenhouse) (2) A tall cylinder in the center of the solar collector ( Solar Chimney) (3) A set of air turbines geared to electric generators around the bottom of the solar chimney The air warms up inside the greenhouse by the solar irradiation and, due to its b...
Article
Full-text available
A floating solar chimney power station (FSCPS) has three major components: A circular solar collector A floating solar chimney in the center of the solar collector A set of air turbines geared to electric generators around the bottom of the solar chimney The efficiency of the FSCPSs is roughly proportional to the height of their floating solar chim...
Article
Full-text available
Floating Solar Chimney Power Stations (FSCPSs) is a new promising solar technology. The Floating Solar Chimneys are lighter than air constructions, that can be as high as 3÷4.5 Km giving to their respective power stations efficiencies from 4.5÷7%. The axial shrouded air turbines of the FSCPSs are geared to appropriate electric generators, In the pr...
Article
Full-text available
A floating solar chimney power station (FSCPS) has three major components: A circular solar collector A solar chimney in the center of the solar collector A set of air turbines geared to electric generators near the bottom of the solar chimney The efficiency of the FSCPSs is roughly proportional to the height of their solar chimneys. In order to in...
Article
Full-text available
A solar turbine power station (STPS) has three major components: A cyclical solar collector A solar chimney in the center of the solar collector A set of air turbo generators near the entrance of the solar chimney The power output of a STPS is roughly proportional to the height of the solar chimney and the surface area of its solar collector. In or...
Article
Full-text available
The introduction of properly defined and electric circuits in Fourier space can give a new powerful technique in studying problems of electromagnetic waves, and a novel view of the behaviour of these waves, in different applications. Using Parseval's identity theorem, one is able to obtain all the possible information for electromagnetic waves by i...
Article
The method developed by Papageorgiou and Raptis for computing the eigenvalues is now applied to scattering problems. In particular a new approach is developed for the computation of the phase shifts of the one-dimensional Schrödinger equation. The algorithm is very simple to code and very efficient for computational purposes. The method is also gen...
Article
Full-text available
A method has been developed for the numerical calculation of eigenvalues of the Schrödinger equation. The eigenvalues are computed directly as roots of a function known in transmission line theory as the impedance. The novel numerical algorithm is simple and very effective in calculating the eigenvalues and eigenfunctions.
Article
Full-text available
The application of optimal control theory of the study of synchronous machine stability with excitation control using speed or power signals has been very well developed in recent years, while the application of optimal control reduction techniques has received least consideration. In the paper an efficient procedure based on control reduction theo...
Article
Full-text available
By applying Fourier transformations to Maxwell's equations, we derive transmission-line equations representing the TE and TM modes of dielectric planar layers. The propagation constants of any mode can be found from the resonance condition of the T circuit representation of the transmission line. The cut-off frequency equivalent circuit is also der...
Article
Full-text available
Starting from Maxwell’s equations it is shown that any inhomogeneous cylindrical guiding structure can be simulated by two circuits. The symmetrical TE and TM modes that can be supported by the structure are obtainable from the resonance condition in the corresponding circuits, which are uncoupled in this case. In all other cases the circuits remai...
Article
Full-text available
A simple, accurate, and fast numerical method for calculating the cutoff frequencies of optical planar dielectric guiding structures is presented. From Maxwell's equations, a transmission-line equivalent circuit for any mode of the guiding structure is derived. The problem of finding the cutoff frequencies is transformed into finding the resonance...
Article
Full-text available
We present a very simple and accurate numerical method for calculating the cutoff frequencies of arbitrary refractive index profile optical fibers, including discrete numerical data from profile measurements. From Maxwell's equations we derive a transmission line equivalent circuit for any mode of an optical fiber which is cutoff frequency dependen...
Article
Full-text available
From Maxwell's equations we derive a simple and accurate algorithm which can determine the propagation constants of the modes of cylindrical dielectric waveguides of arbitrary refractive index. It eliminates the use of Bessel or other complicated functions, and could be implemented in small microcomputers.
Article
Full-text available
A general method is described for solving the electromagnetic field problem associated with a coil of arbitrary shape moving above a number of planar ferromagnetic layers. It is shown that power and the 3-axis forces may be determined using a Fourier transform technique, together with a transmission line analogue. If only power and the 3-axis force...
Article
Full-text available
In the present paper, a new powerful method of studying cylindrical guiding structures, is proposed. Starting from Maxwell equations, equivalent circuits in wavenumber space are constructed. The propagating modes are derived from the resonance conditions of the corresponding circuits. This idea provides a very simple computer algorithm, which does...
Article
Full-text available
The authors (1978) have already shown that the study of longitudinal edge effects in linear induction motors (LIMs) can be greatly simplified by using an extension of the existing Fourier transform theory. The model considered was a single-sided LIM with a limited longitudinal patch of excitation and iron of infinite width and length. The present p...
Article
Full-text available
Fourier-transform theory is used to solve the longitudinal-edge-effect problem in linear induction motors, for constant-current conditions. Inversion of the Fourier transform is obviated by employing Parseval's theorem; calculations are thus considerably simplified. Experimental confirmation is given, together with an approximate method for sketchi...
Article
Floating Solar Chimney (FSC) technology is a solar electricity generating technology. The technology is a low cost version of the solar chimney technology, due to the patented lighter than air solar chimney named Floating Solar Chimney. The principle of operation of solar chimney power plants is very simple. The sun is warming the air below a large...
Article
Full-text available
The applications of FOurier transforms theory to the study of multilayer linear induction devices having excitation windings of finite extent is described. By employing a transmission line analog in Fourier space and Parseval's identity it is shown that the problem can be simplified greatly. The method is illustrated by describing its application t...
Article
Full-text available
A new method is described for studying longitudinal edge effects in linear induction motors using a multilayer model and Fourier transform theory. It is shown that by making use of Parseval's theorem inversion of the transformed field quantities can be completely avoided in the calculation of power and thrust. These calculations are thus greatly si...

Network

Cited By