Experimental demonstration of the feasibility of laser communication with reentry spacecraft at 1.55  μm.

It has been demonstrated experimentally for the first time, to the best of our knowledge, that reliable laser communication at 1.55 μm can be established with reentry spacecraft across the entire atmospheric descent trajectory as a way to avoid radio blackout. A plasma sheath with parameters similar to those around the spacecraft is reproduced at the Lomonosov Moscow State University Mechanics Institute Shock Tube Facility.

Si3N4-TiN nanocomposite by nitration of TiSi2 and consolidation by hot pressing and spark plasma sintering.

Homogeneous nanostructured Si3N4-TiN composite powder was obtained by nitration of a TiSi2 powder precursor in a nitrogen flow. Mechanoactivation of titanium disilicide increases the nitration rate and reduces the temperature of formation of the Si3N4 and TiN. The properties of hot pressing (HP) and spark plasma sintering (SPS) of the nanostructured Si3N4-TiN composite with Y2O3 and Al2O3 additives have been studied.

[Treatment of infantile cerebral paralysis using transcraniovertebral microelectric stimulation].

A new method of therapy of children with cerebral palsy (CP) has been elaborated. Transitory consequent action of weak bipolar low-frequency current (30-100 mcA, 2-10 Hz) on different levels of motor activity regulation (brain and spinal cord, effectory organs) resulted in a stable correction of both motor and other types of disorders in CP patients. Therapeutic course included 2-8 procedures, 1-2 weekly, their duration 3-5 minutes.

[An HIV prevalence study by means of sentinel epidemiological surveillance among injection narcotic abusers in Saint Petersburg].

The data on the study of the spread of HIV infection among injecting drug users in St. Petersburg, carried out by the method of the random testing of blood remaining in used syringes, are presented. Injecting drug users visiting buses working in accordance with the program "Buses for Assistance to Drug Addicts" were chosen as a study group.