1,100 research outputs found
Radiation effects on electronic circuits in a spatial environment
The failings bound to the deterioration of the components under irradiations are complex and numerous. This paper describes the different kinds of radiations present in the space as well as their interactions with the materials composing the integrated circuits used in the spacecraft. Our survey will be focused on the Single Event Upset phenomenon induced by the passage of only one ionizing particle with applications on the Samsung SDRAM
Entropic potential as manifold for the reduced entropy representations in superconductivity
The “cold” causes superconductivity phenomenon, as a measurement process
generating a phase transitions of the second order, and also permitting the rise of
phenomenological parameters, but not allowing the stability of such behaviour, we will
have to write this stability to be supported by a new kind of value as an entropic potential
which learns the systems how to display over all possible microconfigurations, and the
systems by their faculties to increase their standard entropies, dictate the form of this
potential, this will be written as a recursive operatorial equations. The picture of such
potential is interference between thermodynamical length scales of entropies, it seems as
a world of different undetermination orders, if a given variational principle is put down,
it will transit over several definitions. The representation of the entropic potential as a
group transformation linking different temperature thermodynamical length scales as
described by L. Landau will suggest that among considerations brought on propagation
of order parameter carving the recursive stationary state. Concerning the stability
conditions, a context of matrices description will be proposed, as managing the fact that
superconductor, is superconductor per pavement, and the matrixes notations, is
determining the interaction between order parameters as “Heredity” concerning
dimensions, orientations and a mixed subinteraction, where equivalently dimensions and
orientations are mutually excluded each other. The beginning of emergence of this value
is rooted when combinatory formulation of matter, is taken in the order of measurement
process with eigen results, corresponding to normalised macroscopicity levels. The
asymptotic expression for the entropic potential, will be expressing a physical situation
defining that, deflections are collected by a variational principle brought on the Landau
length coherence. The introduction of covariant, contravariant and mixed current density
matrices will establish the limit, according which the reproducible recursive
configurations is only obtained by triplication of a combined fundamental states
Influence of Gravity on noncommutative Dirac equation
In this paper, we investigate the influence of gravity and noncommutativity
on Dirac equation. By adopting the tetrad formalism, we show that the modified
Dirac equation keeps the same form. The only modification is in the expression
of the covariant derivative. The new form of this derivative is the product of
its counterpart given in curved space-time with an operator which depends on
the noncommutative -parameter. As an application, we have computed the
density number of the created particles in presence of constant strong electric
field in an anisotropic Bianchi universe.Comment: 9 pages, correct some miprints, Accepted for publication in journal
of Mod. Phys. Letters
Analysis of fractal radiation patterns from concentric-ring hexagonal arrays
These hexagonal arrays are becoming increasingly popular, especially for their applications in the area of wireless communications. The overall objective of this article has been to use the theoretical foundation developed for the analysis of radiation patterns and design of the hexagonal arrays. A technique has been developed for the analysis of radiation patterns from concentric ring arrays. A family of functions, known as generalized Weierstrass functions, has been shown to play a key role in the theory of fractal radiation pattern analysis
Analysis of radiation patterns and feed illumination of the reflector antenna using the physical and geometrical optics
Reflector antennas are characterized by very high gains (30 dB and higher) and narrow main beams. They are widely used in satellite and line-of-sight microwave communications as well as in radar. Reflector antennas operate on principles known long ago from the theory of geometrical optics. The first reflector system was made by Hertz back in 1888 (a cylindrical reflector fed by a dipole). The radiation fields from aperture antennas, such as slots, open-ended waveguides, horns, reflector and lens antennas, are determined from the knowledge of the fields over the aperture of the antenna. In this paper, we analyzed the effects of feeds relating to the parabolic reflectors such as waveguide and horn. We show the variations of the gain in the electric and magnetic planes (E and H) according to the angle of incidence. In our case, we use the origin to be at the focus
Thermodynamical length scales temperatures correlation for the Ginzburg-Landau theory
The emergence of the superconducting state must obey to a variational principle representations, as considered in the classical schemes, the invariance of the extremum values, according to the use of thermodynamical functions, will suggest an internal coherence governing the jumps realized by the symmetries, against the non-univoc determination permitted by the variations of the thermodynamical parameters. The uncertainties for macroscopic states must be associated to the existence of “macroscopicity levels”, considering the interaction between cooled and cooling, the macroscopic state of each one, will be considered as a combinatory length scales interactions. The reversed role between cooled and cooling suggests that near transition point Eδ will be spent in c²∆Γ . The thermodynamical functions are obtained each from other by the uncertainty principle
The logical closure limit of superconductivity descriptions
The quantum description of macroscopic behaviour seems requiring the existence of limits imposed by the consideration hold on the logical closure of the theory, according to this, the J.A. Wheeler black box [1] will act under a coherence length of second order. The use of mathematical beings translating the phases transitions in nature are displayed in one-way, the reversibility parameter associated to the black box is severely limited according to the way we disturb the constants and the functions used to describe a given phenomenon. The combinatory formulation of matter is always accompanied by the length scales orientation phenomenon that must be seen as a measurement process of second order. The non-reproducibility of experiments will be dealing with the non-account of the amplitude of length scales interactions, this amplitude manages the combinatory of macroscopic levels between an observer and observed. Some introduced concepts as an entropic potential, the breaking of equivalence are making the emergence of picture of superconductivity as reproducible phenomenon according to the “intrinsic states reproducibility” with number estimated on universal constants expressions limited by the difference between cooled and cooling
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