Properties of flame synthesized germanium oxide nanoparticles

Germanium oxide (GeOx) nanoparticles in the size range from 1.5 to 10 nm were synthesized in a low-pressure premixed H2/O2/Ar flame in the pressure range 25-55 mbar. The flame was doped with different amounts of tetramethylgermanium (Ge(CH3)4) ranging from 500 to 2000 ppm. The influence of process parameters such as pressure, flame coordinate, and cold gas flow velocity with respect to growth of germanium oxide particles were investigated. The formed particles were analyzed in-situ according to their mass and charge by means of a particle mass spectrometer (PMS). The specific surface area was determined ex-situ by the BET method. The crystal structure and chemical composition of the produced nanopowder was characterized by EDX and XRD measurements. Additionally, the particles were analyzed by means of FT-IR spectroscopy.     

Topics of polyhedral combinatorics in transportation problems with exclusions

Translated from Kibernetika, No. 6, pp. 63–71, 84, November–December, 1990.     

Nondestructive method of checking the strength of joints with interference fit

The article examines the possibility of devising a nondestructive method of checking the strength of joints with interference fit, based on the measurement of the deformations of the female part in the process of formation of interference in the joint.Translated from Problemy Prochnosti, No. 1, pp. 106–110, January, 1990.     

On the Maximum Noninteger Polyhedron Vertices of the Three-index Axial Assignment Problem

Consideration was given to the maximum noninteger polyhedron vertices in the three-index axial assignment problem of the order n, that is, vertices with 3n - 2 fractional components. New types of these vertices were specified and their combinatorial characteristics studied.     

Magnetic pseudoliquids in sealing devices

Translated from Poroshkovaya Metallurgiya, No. 5(317), pp. 80–85, May, 1989.     

Completeness of vector discrete optimization problems

Translated from Kibernetika i Sistemnyi Analiz, No. 5, pp. 75–83, September–October, 1994.     

Determination of the dissipative effects during sinter treatment of ceramics

The feasibility is established here of analyzing and describing the sinter treatment of ceramics by solving the differential equations of heat and mass transfer on the basis of nonequilibrium thermodynamics.     

Stereotaxic surgery in the hyperkinetic form of infantile cerebral palsy

The results of 67 stereotaxic operations performed in 60 patients for the hyperkinetic form of infantile cerebral paralysis are presented. The efficacy of dentatotomy is compared with that of thalamotomy. Thalamotomy is most effective in patients with hemiatetosis and choreoatetoid hyperkinesis. Dentatotomy resulted not only in a reduction of hyperkinesis, but also in a considerable alleviation of muscle spasticity. The destruction of the lateral part of nuclels dentatus caused predominantly a reduction of the muscle tone and of involuntary movements of the lower extremities, and--to a lesser degree--of the upper as well. The destruction of the medial part of the nucleus dentatus resulted in a clear reduction of muscle dystony in the trunk.