14 research outputs found
Studies of concentration and temperature dependencies of precipitation kinetics in iron-copper alloys using kinetic monte carlo and stochastic statistical simulations
The earlier-developed ab initio model and the kinetic Monte Carlo method
(KMCM) are used to simulate precipitation in a number of iron-copper alloys
with different copper concentrations x and temperatures T. The same simulations
are also made using the improved version of the earlier-suggested stochastic
statistical method (SSM). The results obtained enable us to make a number of
general conclusions about the dependencies of the decomposition kinetics in
Fe-Cu alloys on x and T. We also show that the SSM describes the precipitation
kinetics in a fair agreement with the KMCM, and employing the SSM in
conjunction with the KMCM enables us to extend the KMC simulations to the
longer evolution times. The results of simulations seem to agree with available
experimental data for Fe-Cu alloys within statistical errors of simulations and
the scatter of experimental results. Comparison of results of simulations to
experiments for some multicomponent Fe-Cu-based alloys enables us to make
certain conclusions about the influence of alloying elements in these alloys on
the precipitation kinetics at different stages of evolution.Comment: 18 pages, 17 postscript figures, LaTe
Testing of CP, CPT and causality violation with the light propagation in vacuum in presence of the uniform electric and magnetic fields
We have considered the structure of the fundamental symmetry violating part
of the photon refractive index in vacuum in the presence of constant electric
and magnetic fields. This part of the refractive index can, in principle,
contain CPT symmetry breaking terms. Some of the terms violate Lorentz
invariance, whereas the others violate locality and causality. Estimates of
these effects, using laser experiments are considered.Comment: 12 page
Real and virtual photons in an external constant electromagnetic field of most general form
The photon behavior in an arbitrary superposition of constant magnetic and
electric fields is considered on most general grounds basing on the first
principles like Lorentz- gauge- charge- and parity-invariance. We make model-
and approximation-independent, but still rather informative, statements about
the behavior that the requirement of causal propagation prescribes to massive
and massless branches of dispersion curves, and describe the way the eigenmodes
are polarized. We find, as a consequence of Hermiticity in the transparency
domain, that adding a smaller electric field to a strong magnetic field in
parallel to the latter causes enhancement of birefringence. We find the
magnetic field produced by a point electric charge far from it (a manifestation
of magneto-electric phenomenon). We establish degeneracies of the polarization
tensor that (under special kinematic conditions) occur due to space-time
symmetries of the vacuum left after the external field is imposed.Comment: 30 pages, 1 figure, 57 equations, reference list of 38 item
Derivative Substantives in the Media System of Text-Formation
The article considers derivative substantives as text-oriented language means that affect the content, style and evaluation of the text and reflect the intentions, mood, way of thinking and emotions of its author. The research is based on the material of the epistolary heritage of Chekhov. The semantic identity of derivative formations is investigated using the method of component analysis. As a result of the research, it was determined that derivative substantives, normal and occasional, are involved in the structuring and organization of the text space of Chekhov’s epistolary.El artículo considera sustantivos derivados como medios orientados al texto que afectan el contenido, el estilo y la evaluación del texto y reflejan las intenciones, el estado de ánimo, la forma de pensar y las emociones de su autor. La investigación se basa en el material del patrimonio epistolar de Chekhov. La identidad semántica de las formaciones derivadas se investiga utilizando el método de análisis de componentes. Como resultado de la investigación, se determinó que los sustantivos derivados, normales y ocasionales, están involucrados en la estructuración y organización del espacio de texto de la epistolaria de Chekhov