9 research outputs found
Contribution of a time-dependent metric on the dynamics of an interface between two immiscible electro-magnetically controllable Fluids
We consider the case of a deformable material interface between two
immiscible moving media, both of them being magnetiable. The time dependence of
the metric at the interface introduces a non linear term, proportional to the
mean curvature, in the surface dynamical equations of mass momentum and angular
momentum. We take into account the effects of that term also in the singular
magnetic and electric fields inside the interface which lead to the existence
of currents and charges densities through the interface, from the derivation of
the Maxwell equations inside both bulks and the interface. Also, we give the
expression for the entropy production and of the different thermo-dynamical
fluxes. Our results enlarge previous results from other theories where the
specific role of the time dependent surface metric was insufficiently stressed.Comment: 25 page
Hydrodynamics of Surface and Filtration Phenomena in Polarizing and Magnetizing Media
Available from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio
Scenarios of structure formation in ternar nanoparticles based on Pd-Pt in the presence of dopant Ni
In this work, scenarios of structure formation in ternary nanoparticles based on platinum and palladium of four stoichiometric compositions of different sizes were studied, with nickel acting as a dopant. Two alternative methods were used: the molecular dynamics method (implemented in the open source software LAMMPS) and the Monte Carlo method (implemented in the Metropolis scheme). In addition, to describe the interatomic interaction, two versions of force fields were used: the modified tight-binding potential (when implementing the molecular dynamics and Monte Carlo methods) and the embedded atom potential (when implementing the molecular dynamics method). Based on the results of a series of computer experiments, it was found that palladium atoms have increased segregation to the surface. At a cooling rate of 0,1 K/ps, an ordered crystalline FCC structure with inclusions of the HCP phase is formed. With an increase in the nickel dopant content to 20% in the ternary Pd-Pt-Ni nanoparticle, the identifiable local structure becomes more complex, both in terms of the number of phases and in terms of structural segregation
Regularities of structural transformations in bimetallic Pd-Pt nanoparticles
The processes of melting and crystallization of bimetallic Pt- and Pd-based nanoparticles have been studied by the method of molecular dynamics. The possibility of obtaining stable nanoparticles containing 3000 and 4000 atoms in the temperature range from 500 K to 1600 K is established. The concept about the possibility of fixing the temperatures of starting and ending of the phase transition for melting and crystallization is confirmed which was put forward earlier for monometallic platinum and palladium nanoparticles. The analysis shows that during the cooling of Pd-Pt nanoparticles with an initially uniform distribution of components, formation of a mixed structure with a surface monolayer of Pd atoms is observed. The possibility of structural segregation in bimetallic Pd-Pt nanoparticles containing 3000 and 4000 atoms is shown. At the same time, these two sizes correspond to different scenarios. For bimetallic nanoparticles with 3000 atoms, local zones are mainly polyhedral, and for bimetallic nanoparticles containing 4000 atoms, formation of extended band structures is observed
ΠΠ΅ΡΠ΅Π½ΠΈΠ΅ ΠΌΡΠΆΡΠΊΠΎΠ³ΠΎ Π±Π΅ΡΠΏΠ»ΠΎΠ΄ΠΈΡ ΠΏΡΠΈ Π²Π°ΡΠΈΠΊΠΎΡΠ΅Π»Π΅. ΠΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΎΠ΅ Π½Π°Π±Π»ΡΠ΄Π΅Π½ΠΈΠ΅
The article presents an example of clinical observation of a patient with varicocele complicated by pathospermia, oxidative stress, and DNA fragmentation. The patient underwent varicocelectomy on the left side according to the Marmar technique. The patient was prescribed antioxidant therapy after the surgery. Some positive dynamics of individual parameters in the spermogram were noted 6 months after the antioxidant therapy, but they were not reliable ( p > 0.05). A significant positive correlation between DNA fragmentation and reduction of reactive oxygen species was recorded ( p 0,05). ΠΡ Π·Π°ΡΠΈΠΊΡΠΈΡΠΎΠ²Π°Π»ΠΈ Π΄ΠΎΡΡΠΎΠ²Π΅ΡΠ½ΡΡ ΠΏΠΎΠ»ΠΎΠΆΠΈΡΠ΅Π»ΡΠ½ΡΡ ΠΊΠΎΡΡΠ΅Π»ΡΡΠΈΡ ΠΌΠ΅ΠΆΠ΄Ρ ΠΠΠ-ΡΡΠ°Π³ΠΌΠ΅Π½ΡΠ°ΡΠΈΠ΅ΠΉ ΠΈ ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΠ΅ΠΌ Π°ΠΊΡΠΈΠ²Π½ΡΡ
ΡΠΎΡΠΌ ΠΊΠΈΡΠ»ΠΎΡΠΎΠ΄Π° ( p < 0,05). Π’Π°ΠΊΠΈΠΌ ΠΎΠ±ΡΠ°Π·ΠΎΠΌ, Ρ
ΠΈΡΡΡΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ΅ Π»Π΅ΡΠ΅Π½ΠΈΠ΅ Π²Π°ΡΠΈΠΊΠΎΡΠ΅Π»Π΅ Π½Π΅ Π²ΡΠ΅Π³Π΄Π° ΡΠΏΠΎΡΠΎΠ±ΡΡΠ²ΡΠ΅Ρ Π²ΠΎΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΈΡ ΠΎΡΠ΄Π΅Π»ΡΠ½ΡΡ
ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠΎΠ² ΡΠΏΠ΅ΡΠΌΠΎΠ³ΡΠ°ΠΌΠΌΡ. ΠΠ΄Π½Π°ΠΊΠΎ ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΠ΅ ΠΠΠ-ΡΡΠ°Π³ΠΌΠ΅Π½ΡΠ°ΡΠΈΠΈ ΡΠΏΠ΅ΡΠΌΠ°ΡΠΎΠ·ΠΎΠΈΠ΄ΠΎΠ² ΠΏΠΎΡΠ»Π΅ Π²Π°ΡΠΈΠΊΠΎΡΠ΅Π»ΡΠΊΡΠΎΠΌΠΈΠΈ ΠΏΠΎΠ·Π²ΠΎΠ»ΡΠ΅Ρ ΠΏΠΎΠ»ΡΡΠΈΡΡ ΠΏΠΎΠ»Π½ΠΎΡΠ΅Π½Π½ΡΠ΅ ΡΠΏΠ΅ΡΠΌΠ°ΡΠΎΠ·ΠΎΠΈΠ΄Ρ, ΠΊΠΎΡΠΎΡΡΠ΅ ΠΌΠΎΠΆΠ½ΠΎ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°ΡΡ Π² ΠΏΡΠΎΠ³ΡΠ°ΠΌΠΌΠ°Ρ
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