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International Review of PHYSICS - Papers
Vol. 3 n. 2, pp. 68-73
Abstract
-
In this article, an explanation of quantum teleportation using the Bohm
approach will be presented. We will use a notion of information that is
active, passive as well as inactive. The Copenhagen interpretation and
the standard quantum theory are unable to provide an explanation of
quantum teleportation. In this paper we also suggests the need to
develop the notion further by linking it to Bohm’s notions of the
implicate and explicate orders. We will discuss an underlying physical
process although not directly observable has observable consequences.
Furthermore, this approach demonstrates why classical information is
needed at the final stages of measurement that produces quantum
teleportation.
Copyright © 2009 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords: Quantum teleportation, Bohm theory, Unfold & Enfold, The implicate & explicate order.
Thermal
Peculiarities of Stable Macroscopic Distribution of Applied Current in
High-Temperature Superconductors
by Vladimir R.
Romanovskii
Vol. 3 n. 2, pp. 74-85
Abstract - The influence of the stable temperature rise induced by current charging on the current-carrying capacity of a high-temperature superconductor without stabilizing matrix is investigated. Two characteristic values of the electric field at which the convective and conductive heat transfer mechanisms mostly affect the formation of current charging states in the superconductor are defined. It is shown that its stable temperature preceding the onset of current instability not only is always above the coolant temperature but also increases with decrease in these characteristic electric fields. As a result, the current stability conditions are modified due to the thermal peculiarities of the current charging formation of stable electrodynamics states of the superconductor. Namely, the allowable stable values of electric field and current can be below or above those determined by a priori chosen critical parameters of the superconductor. The criteria allowing one to estimate the boundary of existence of these stability areas (sub-critical and over-critical) are written taking into account the size effect. The performed analysis reveals that the temperature-dependent heat capacity of superconductor leads to such shape of its voltage-current characteristics, which has only the positive slope during continuous current charging both before and after current instability onset. It is also proved that the thermal degradation of the current-carrying capacity of superconductor occurs in the sub-critical area. Due to this effect, the currents flowing stably in the superconductor are not only obviously less than the corresponding critical current, but also not increase proportionally to increasing cross-sectional area of superconductor or to its critical current density. These effects must be considered in investigations of current-carrying capacity of superconductors.
Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: High-Temperature superconductor; Voltage-Current characteristic; Applied Current; Temperature rise; Current instability.
Vol. 3 n. 2, pp. 86-101
Abstract
-
The present review deals with the growth of amorphous
silicon (a-Si:H) thin films by Rf ( Radio frequency 13.56 MHz)
sputtering technique . A comprehensive study of growth mechanism is
presented. An insight on the influence of substrate temperature and
applied Rf powers on the growth mechanism is highlighted. During film
growth the growing film surface undergo an intensive ion bombardment
incoming from the plasma. The results of these interaction plasma
substrate investigations were also presented.
Copyright © 2009 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords: Amorphous silicon; Thin films; Sputtering; Growth mechanism.
Vol. 3 n. 2, pp. 102-108
Abstract
-
In this paper, for a polycrystalline silicon solar PN junction, the
recombination current density in grain boundary is theoretically
investigated.
Our analysis was done using front and rear passivation layers. Silicon
nitride wafers are considered as a front passivation films, this new
material has led to a significant enhancement of the conversion
efficiency. In addition, we propose a functioning modeling of the rear
passivation solar cell. The thin thermal oxide/Silicon nitride/ Silicon
oxide rear passivation contact is chosen for its superior optical
quality (Internal reflection) and its good electrical properties
(Recombination surface velocity).
In order to understand the recombination processes, the obtain of
current density through grain boundary is carried out. The aim of this
work is the evaluation of the optimal surface recombination velocity at
grain boundaries which permits to obtain a good improvement of the
conversion efficiency.
Copyright © 2009 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords: Polysilicon, Silicon Nitride, Grain Boundary, Conversion Efficiency.
Electro-Optical, Spectroscopical and Morphological Properties of
Ultraviolet cured Polymer/Liquid Crystal Films
by D. Benaissa, L.
Méchernène, A. Addad, U. Maschke
Vol. 3 n. 2, pp. 109-114
Abstract - The electro-optical behavior of Polymer Dispersed Liquid Crystal (PDLC) films was studied to understand the relationship between the conditions of preparation in terms of the extent of curing, the morphology, and the response to an external electrical field. The PDLC films were prepared by phase separation of a diacrylate/nematic low molecular weight liquid crystal mixture induced by Ultraviolet (UV) curing as a function of irradiation dose. The polymerization/crosslinking process was monitored by Fourier Transform Infrared Spectroscopy (FTIR) in terms of the radiation dose and LC concentration. The conversion of double bonds of the acrylic monomer shows a rapid increase at low dose values followed by a plateau. The transmission vs voltage curves were investigated as a function of wavelength and sample thickness, and show low transmission in the off-state and high transmission in the on-state. The analysis was accomplished by a proper morphology consideration.
Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Polymer network, Acrylate, Liquid crystal, UV irradiation, Electro-optical measurements, Infrared spectroscopy, Morphology, UV-vis spectroscopy.
Determination of the Heat of Adsorption from Solution from Equilibrium
Concentration Measurements as a Function of the Temperature and
Comparison with Direct Calorimetric Measurements
by Guillermo A. Alvarez,
Juan C. Moreno, Liliana Giraldo
Vol. 3 n. 2, pp. 115-122
Abstract - A method for the determination of the heat of adsorption from solution of a substance, h°T, P, from measurements of the equilibrium concentration of the substance remaining in solution as a function of the temperature is presented and compared with the direct measurement of the heat of adsorption using a state-of-the art heat conduction microcalorimeter for the system phenol in aqueous solution and an activated carbon surface. Equilibrium considerations are employed similar to those used to calculate the so-called isosteric heat of adsorption from the slope of the equilibrium pressure vs. the temperature at constant adsorption but in a way simpler than this method which requires recording the pressure as a function of the coverage, ξ, at several temperatures while the present method gives directly the heat of adsorption from the single slope of the equilibrium concentration vs. the temperature at constant pressure. The transfer of moles of solute from the solution to the carbon surface obeys Nernst’s distribution law with an equilibrium constant which depends only on the temperature and pressure. Hence, the quantities obtained from the equilibrium condition are standard functions. The values obtained for the heat of adsorption of phenol by this method are typical of those found for mild physical adsorption. Heats of adsorption are important to characterize porous carbon surfaces and for the study of intermolecular interactions in condensed phases.
Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Heat of adsorption from solution; heat conduction microcalorimeter; aqueous-phase adsorption of phenol by active carbon; Nernst’s distribution law; regular solution; intermolecular interactions.
Numerical
Heat and Mass Transfer for Viscous Flow past a Nonlinearly Stretching
Sheet
by Kai-Long Hsiao,
Guan-Bang Chen
Vol. 3 n. 2, pp. 123-128
Abstract - In this study, an analysis has been performed for heat and mass transfer of a steady laminar boundary-layer flow of a viscous flow past a nonlinearly stretching sheet. Parameters n, Ec, Pr, Sc represent the dominance of the nonlinearly effect, viscous effect, thermal effect and mass transfer effect which have presented in governing equations, respectively. The similar transformation and the finite-difference method have been used to analyze the present problem. The result show that the heat transfer effect is good for a higher Pr and the mass transfer effect is good for a higher Sc.
Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Nonlinearly stretching sheet, Heat and mass transfer, finite-difference, Viscous dissipation.
Modeling
by a Method for Automating Self Moiré Images for Applications in
Three-Dimensional Metrology, Surfaces-2D-3D
by Mohammedi
Ferhat
Vol. 3 n. 2, pp. 129-134
Abstract - The question that dominates
and dictates the vision of this work is formed by the low spatial
frequencies may appear in the combination of the light distribution of a
periodical. The paper describes a method that allows the accurate
prediction of the fringe localization in moiré. In the case of objects
moving as a whole, moiré can thus as a metrological tool.
We present the analysis of the moiré fringes self of two gratings of
identically periods. The following applications are considered: study of
mechanical vibrations and deformation, micro geometrical properties of
surfaces. Several applications are emphasized: plane, cylindrical and
spherical objects. Theoretical predictions are compared with
experimental results.
Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Moiré phenomena, Gratings, CCD-camera, Patterns, Projection system.
On
the Inter-Floor Radio Propagation: General UTD Analysis
by Ivan Marinovic,
Igor Zanchi, Zoran Blazevic
Vol. 3 n. 2, pp. 135-142
Abstract - The paper presents results of Uniform Theory of Diffraction (UTD) simulation of inter-floor propagation inside a building. The model of propagation includes three mechanisms of propagation: the transmission through the floors, the diffraction on the windows and the propagation by multiple reflections through vertical apertures inside a building. Each type of mentioned rays is analyzed separately, but the conclusions regarding the path-loss of composite signal may be established based on the presented results. Also, the term of particular decaying constant is introduced.
Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Indoor Inter-Floor Propagation, UTD method, Path-Loss, Decaying Constant.
A
Comprehensive Three Dimensional Dynamic Model of the Human Elbow Joint
by A. M. El Arabi,
M. T. Khaled, A. H. Taher, G. M. Adel
Vol. 3 n. 2, pp. 143-1148
Abstract - This study introduces a three-dimensional dynamic model of the human elbow joint. In this model the bones and joints of the upper extremity as well as 15 muscles and 4 ligaments crossing the elbow joint were considered. Six equations of motion, with 30 unknowns, were obtained using Newton's 2nd law of motion at elbow joint. These unknowns were the magnitudes and directions of 15 elbow muscle forces, 4 ligament forces, the moment arms of the muscles and ligaments about the elbow and radio-humeral joints, and the contact forces. The position of the bony landmarks and the centers of gravity of the upper limb were recorded in global coordinates with two digital video cameras. The WINanalyze software was used to analyze the motion. The results were fed to the software package, developed by the authors, to calculate the kinematics of points of interest as well as the direction cosines and moment arms of all the muscle and ligaments. A genetic optimization package was used to compute the musculoskeletal forces, utilizing the minimization of the resultant contact force at the elbow region as an objective function.
Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Elbow Joint; Optimization; EMG; Muscle Forces; Dynamic Model.
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