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

Лечение мужского бесплодия при варикоцеле. Клиническое наблюдение

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). Мы зафиксировали достоверную положительную корреляцию между ДНК-фрагментацией и снижением активных форм кислорода ( p < 0,05). Таким образом, хирургическое лечение варикоцеле не всегда способствует восстановлению отдельных параметров спермограммы. Однако снижение ДНК-фрагментации сперматозоидов после варикоцелэктомии позволяет получить полноценные сперматозоиды, которые можно использовать в программах вспомогательных репродуктивных технологий