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Noncommutative QED and Pure Geometric Gauge Fixing, by
N. Mebarki, F. Khelili, M. Harrat, O. Benabbés
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New Approach to the BRS Quantization of the Standard
Model on a Discret Superspace,
by N. Mebarki, A. Redouane-Salah, O. Benabbés
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Study of Langmuir Probe Parameters
in Low Temperature Plasma-Theory and Experiment, by M.
Benhaliliba, A. Belasri, F. Chami, Yu. A. Lebedev
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Two-Dimensional Silicon Photonic Crystals, by L. A.
Karachevtseva
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Microstructure and Hardness Dependence of the
Pressure of Nano - Crystalline Aluminum Alloys, by M. Abou Zied,
A. A. Ebnalwaled
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Oxygen and Carbon Effect on the Segregation Energy
of Be on Cu-4at.%-Be Alloy Surface, by S. Belkhiat, F. Keraghel
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Optical Bistability in a Laser Containing a
Saturable Absorber with Homogeneous Broadening, by S. Djabi, A.
Guechi, H. Boudoukha, M. Djabi
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Electromagnetic Shielding by Chiral Material, by R.
Oussaid, H. Saadi
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SPICE Implementation of Neural-Based Models for
Solar Cells Under Solar Concentration, by A. Cheknane, F.
Djeffal, T. Bendib
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Weighted Density Functional Theory of Circularly
Inhomogeneous Hard Disks, by R. Khordad, M. Moradi, F.
Taghizadeh
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International Review
of PHYSICS - Papers
 Noncommutative
QED and Pure Geometric Gauge Fixing
by N. Mebarki, F.
Khelili, M. Harrat, O. Benabbés
Abstract - A
generalized matrices valued commutation relations between the space-time
coordinates and their canonical conjugates are introduced . The total
QED like action is constructed and it is shown that the gauge fixing
term and renormalized like fermionic mass and charge occur dynamically
as a consequence of the non commutativity. New Feynman rules of
d-dimensional momentum space photonic and fermionic propagators as well
fermions-photon vertex operator are deduced.
Copyright © 2007 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords:
Gauge Theories, Non Commutative Geometry.
New Approach to the BRS Quantization of the Standard Model on a Discret
Superspace
by N. Mebarki, A.
Redouane-Salah, O. Benabbés
Abstract - To
reformulate the quantized standard model with massless ghost fields, an
extended discrete superspace M4⊗Z2⊗S¹ mathematical
formalism with six components valued functions is introduced. The
corresponding one and two superforms which are defined and the related
nilpotency compatibility conditions are obtained. As a consequence, a
Jacobi-like identity for the ZN (N≥3) discret space group
structure constants is deduced. To obtain the Fadeev-Popov and fixing
terms, a generalized scalar product is defined. The BRS transformations
are derived through an horizontality like condition.
Copyright © 2007 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords:
BRST Quantization, Discrete space, Gauge Theories.
Abstract - In order
to simplify the equations and to calculate positive ion current
collected by a probe and electric field created by charges some
dimensionless parameters are introduced. The parameterization is a
method to convert physics magnitudes and variables which have dimension
to dimensionless parameters without loosing their physical sense.
Consequently, the parameters can be described by mathematical entities
as polynomials. The positive ion current which is the main magnitude is
calculated and then the I-V characteristics in its parameterization form
is deduced and fitted. Cylindrical and spherical Langmuir probe cases
are studied, their ion current is compared to the one collected by
planar probe. The dimensionless electric potential, electric field, ion
current and ion velocity are respectively denoted as y(x),
(x),
I
and
ui. Consequently
through the normalised parameters, some data such as probe radius,
electric field and ion current are calculated. Experimental data are
measured using double probe microwave plasma.
Copyright © 2007 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords:
low temperature plasma, Langmuir probe, I-V characteristics,
parameterisation, ion current.
Two-Dimensional
Silicon Photonic Crystals
by L. A. Karachevtseva
Abstract - Photonic
crystals are dynamic direction of modern solid state physics. Today the
basic researches are concentrated on the 2D photonic crystals for the
development of active and passive elements of the future integrated
nanophotonic circuits. Macroporous silicon is an ideal 2D photonic
crystal due to formation of structures with the necessary geometry, the
big ratio of the cylindrical macropore depth by the diameter. For
out-of-plane light propagation sharp increase in absorption and absolute
photonic band gap formation is observed between second and third bands
for macroporous silicon structures. Theoretically unpredicted reduction
in the transmittance of electromagnetic radiation and the step formation
are measured for wavelengths less than optical period of structures due
to optical modes formed by macroporous silicon as a short waveguide
structure. Absorption, photoconductivity and Raman scattering maxima are
determined by a corresponding maximum of a longitudinal component of
electromagnetic waves in macroporous silicon structure. And polaritonic
resonances in 2D silicon photonic crystals are observed due to strong
interaction of longitudinal component of electromagnetic waves with
surface oscillators. Photosensitivity enhancement and polaritonic mode
formation inspired development of active and passive elements in
photonic crystal microchips, compact highly sensitive uncooled detectors
of light radiation.
Copyright © 2007 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords:
Macroporous silicon, 2D photonic crystal, polaritonic resonance.
Microstructure and Hardness Dependence of the Pressure of Nano -
Crystalline Aluminum Alloys
by M. Abou Zied, A. A.
Ebnalwaled
Abstract - Nano-crystalline
aluminum was synthesized by a new method of ball milling technique from
ingots of 99.8 wt.% Al. The effect of the pressure on the microstructure
and mechanical properties of compacted ball milled aluminum were
investigated in a pressure range up to 300 Pa. The results indicate that
our specimens are characterized by screw dislocation. The dislocation
density and microhardness of our specimens increases by increasing
pressure. The best fit line describes the H-P relationship dependence of
micro-hardness (HV0.010) on the grain size for compacted aluminum obey
the following formula : HV0.010= 35.42 <D>-1/2 + 245.02 (kg
mm-2).
Copyright © 2007 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords:
Microstructure, Microhardness, Dislocations, Aluminum Alloys.
Oxygen
and Carbon Effect on the Segregation Energy of Be on Cu-4at.%-Be Alloy
Surface
by S.
Belkhiat, F. Keraghel
Abstract - Auger
electron spectroscopy (AES) has been used to study the Be segregation on
the Cu-4%at.Be alloy surface. This segregation has been studied in the
presence of both chemisorbed oxygen and carbon impurity. The layer of Be
formed, on the surface, by Gibbsian segregation has been followed. Its
thickness has been found close to that of a monolayer. The activation
energy of Be segregation has been determined experimentally and the
value found is in agreement with the resulted theoretical one.
Copyright © 2007 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords:
Cu-4%at.Be, activation energy of Be, segregation energy, BeO, CuO,
Cu2O.
Optical Bistability in a Laser Containing a Saturable Absorber with
Homogeneous Broadening
by S. Djabi, A. Guechi,
H. Boudoukha, M. Djabi
Abstract - In this
study, we will study theoretically the effect of optical bistability in
a laser saturable with homogeneous broadening for a Fabry-Perot
resonator. The approach considered here takes in a phenomenological way
into account the essential physical processes which makes it possible to
determine the principal parameters in a LSA and their influences on the
optical bistability. On the basis of the system of Rate Equation
Approach (REA), we analytically and numerically solved this type of
equation for stationary case. We established a program to determine the
interval of the effect of the optical, to plot the curves representing
the density of the photons in the pumping function of the active medium
and finally to analyze the linear stability of the obtained solutions.
Copyright © 2007 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords:
Optical Bistability (OB), Fabry-Perot cavity, Laser containing a
Saturable Absorber (LSA), Homogeneous broadening, Rate Equation Approach
(REA).
Electromagnetic
Shielding by Chiral Material
by R. Oussaid, H. Saadi
Abstract - In this
paper we present a theoretical study of the plane waves in chiral media.
The reflection from and transmission through a dielectric-chiral
interface are analyzed. When a plane wave is incident upon a boundary
between a dielectric and a chiral medium, it splits into two transmitted
waves proceeding into the chiral medium and a reflected wave propagating
back into the dielectric. The interface is made of chiral material and
it is electromagnetically characterized with three material parameters:
permittivity, permeability, and chirality. Due to chirality, there is
magnetoelectric coupling. The electric and magnetic shielding effects
are shown to be function of the three material parameters. We found
that, at normal incidence, reflection is found to occur similar to that
for the isotropic medium. The cross-polarization effects caused by the
chirality will appear at oblique wave incidence.
Copyright © 2007 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords:
Chiral media, wave propagation, Electromagnetic, shielding.
SPICE
Implementation of Neural-Based Models for Solar Cells Under Solar
Concentration
by A. Cheknane, F.
Djeffal, T. Bendib
Abstract - The
photovoltaic cells industry requires more financial investment than ever
in order to measure the growing sophistication of the manufactured
products and for the equipment necessary to their development. So, the
modelling of photovoltaic components constitutes a research field that
is currently very important and very attracting throughout the world. To
continue this trend, the existing models must be improved and new models
have to be developed. Hence, we regularly see improvements of simulation
software. In this paper, we investigate a modelling process based on
neural computation, able to demonstrate the cell’s output features in
terms of irradiance, temperature and solar concentration environment
changes. Our neural structure is trained according to experimental
results where the based-silicon solar cells are suited for providing
efficient operation at solar intensities exceeding 150 suns AM1.5. The
obtained Artificial Neural Networks (ANN) mapping function is
implemented into SPICE as new compound in order to obtain some useful
information about the use of the solar cells in real environment.
Copyright © 2007 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords:
Artificial Neural Networks, Photovoltaic panels, Solar cell
parameters, SPICE model.
Weighted
Density Functional Theory of Circularly Inhomogeneous Hard Disks
by R. Khordad, M. Moradi, F. Taghizadeh
Abstract - The
influence of phase fluctuations of a laser light on the atomic
reflection process of evanescent modes is investigated. This influence
is one of the main factors that limit the performance of the atomic
mirror action obstructing the ultimate goal of near-perfect coherent
reflection process. It is concluded that this influence plays a
significant role hence should be incorporated in the treatment of
quantum dynamics. By operating at low intensities, this influence can
only be minimized. We apply the expressions for the optical forces,
considering the phase fluctuations due to the laser light source. All
treatments of the phase diffusion model are deduced from the well-known
master equation. Different effects arising from application of various
phase fluctuations values are considered. These include enhancement of
the spontaneous force, and decreasing the dipole forces magnitudes. The
changes of the atom trajectories due to these effects are pointed out
and discussed.
Copyright © 2007 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords:
Phase fluctuations, evanescent light, spontaneous and dipole
forces, optical potential, decay rate, Rabi frequency.
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