137Cs in puddle sediments as timescale tracer in urban environment.

The (137)Cs-based chronological approach is suggested to identify the age of urban landscapes and the chronology of pollution of soil in residential areas. Three main pivot points constitute the basis of the chronological approach: beginning of the Atomic Era in 1945, the maximum input in 1963 and the Chernobyl accident in 1986. Application of (137)Cs as a timescale tracer was tested on the example of Ekaterinburg, a city in the Middle Urals region of Russia.

Experimental investigation of the onset of instability in a radial Hele-Shaw cell.

The initial stage of interface instability upon radial displacement of a fluid in a Hele-Shaw cell is investigated. An air-silicone oil system is analyzed. The critical radii of stability relative to long-wave perturbations are determined.

High-efficiency single-mode free-electron maser oscillator based on a bragg resonator with step of phase of corrugation.

A new type of high-selective Bragg resonator having a step of corrugation inside the interaction region was used as a microwave system for a free-electron maser (FEM). Using a LINAC LIU-3000 (1 MeV/200 A/200 ns) to drive the FEM oscillator, a single-mode single-frequency operation was achieved at a frequency of 30.74 GHz with an output power of about 50 MW, which corresponded to a record efficiency of 35% for a millimeter wavelength FEM.

[Clinical use of artificial heart valve PLANIKS].

The first clinical results of a new repeated-disc artificial heart valve PLANIKS application were summarized. In prosthesis the useful hydrodynamic parameters, durability, reliability, convenience and easiness while implantation conduction are combined harmoniously, the sterility is guaranteed. PLANIKS permits to correct adequately the hemodynamics disorders in the early postoperative period and may be recommended for the clinical practice use.