Plasmonic nanosponges filled with silicon for enhanced white light emission.

Plasmonic nanosponges are a powerful platform for various nanophotonic applications owing to extremely high local field enhancement in metallic nanopores. The filling of the nanopores with high-refractive index semiconductors (e.g. Si, Ge, GaP, etc.) opens up opportunities for the enhancement of nonlinear effects in these materials. However, this task remains challenging due to the lack of knowledge on the integration process of metal and high-index semiconductor components in such nanoobjects. Here, we investigate metal-dielectric nanoparticles fabricated from bilayer Si/Au films by the laser printing technique via a combination of theoretical and experimental methods. We reveal that these hybrid nanoparticles represent the Au sponge-like nanostructure filled with Si nanocrystallites. We also demonstrate that the Au net provides strong near-field enhancement in the Si grains increasing the white light photoluminescence in the hybrid nanostructures compared to uniform Si nanoparticles. These results pave the way for engineering the internal structure of the sponge-like hybrid nanoparticles possessing white light luminescence and control of their optical properties on demand.

Atomistic simulation of ion track formation in UO2.

The atomistic simulation of track formation due to the moving of swift heavy ion is performed for uranium dioxide. The two-temperature atomistic model with an explicit account of electron pressure and electron thermal conductivity is used. This two-temperature model describes a ionic subsystem by means of molecular dynamics while the electron subsystem is considered in the continuum approach. The various mechanisms of track formation are examined. It is shown that the mechanism of surface track formation differs from the mechanism of track formation in the bulk. The threshold values of the stopping power for track formation are estimated.

Interatomic potential for uranium in a wide range of pressures and temperatures.

Using the force-matching method we develop an interatomic potential that allows us to study the structure and properties of α-U, γ-U and liquid uranium. The potential is fitted to the forces, energies and stresses obtained from ab initio calculations. The model gives a good comparison with the experimental and ab initio data for the lattice constants of α-U and γ-U, the elastic constants, the room-temperature isotherm, the normal density isochore, the bond-angle distribution functions and the vacancy formation energies. The calculated melting line of uranium at pressures up to 80 GPa and the temperature of the α-γ transition at 3 GPa agree well with the experimental phase diagram of uranium.

[Blood serum phospholipids in patients with tonsillitis under combinated alcohol-bacterial influence].

Blood serum phospholipids were investigated in alcohol abusing patients with tonsillitis. Most significant changes in phospholipids spectrum (low relative content of lysophospholipids and higher phosphatidylholine and phosphatidyletanolamin) in alcohol abusing patients with tonsillitis were observed, compared with alcohol abusers. This may be attributed to the prevailing influence of bacterial infection.

[Impact of alcohol abuse on the composition of serum lipids in patients with tonsillitis].

The purpose of the study was to assess the impact of alcohol abuse on the composition of serum lipids in patients with tonsillitis. The values of the serum lipid spectrum were studied in 100 alcohol abusers with Streptococcus-induced lacunar tonsillitis, 100 alcoholics without markers of viral hepatitis, and 50 healthy individuals. The effect of alcohol was shown in elevated triglyceride levels in patients with alcoholism and tonsillitis. Exposed to bacterial infection, the tonsillitis patients who abused alcohol had higher levels of phospholipids and free cholesterol and lower concentrations of free fatty acids and cholesterol esters than the alcoholics. The tonsillitis patients who abused alcohol were observed to have more considerable changes in the spectrum of phospholipids as a low relative content of lysophospholipids and higher levels of phosphatidylcholine and phosphatidylethanolamine than the alcoholics, which may be due to the predominant impact of bacterial infection.