[Beta therapy of vulvar leukoplakia].
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Beta Particles↗
Biomedical subjects
A Kovachev
Publications and source records attributed to A Kovachev.
[Inertial separation of dust particles in a direct-flow field].
A description is given of a graphic-mathematical method for approximate finding the separation capacity of the forward directed flow separator. The differential equations for the movement of a particle in changeable air flow are used. The parameters of the air flow in the canal of the separator are established in a graphic way. The equations are solved after the numerical method of Runge-Kuta. The aim of the work is to project a separator in a theoretical way observing definite requirements of the respirable fraction of the total dust.
Air Pollutants, Occupational↗
[Method and apparatus setup for preparing test dusts with a specified granulometric composition by air separation].
A method is developed and apparatuses constructed for the preparation of zeolite dusts for biological experiments in vivo and in vitro with dimensions under 5 micron. The method includes autogenic grinding of rocky zeolite material and air separation of the fraction under 63 micron, by means of cyclone and experimentally chosen conditions of work. The received "respirable" dust very well imitates the dust of the air from the working environment. The preparation of different experimental dusts is possible when suitable conditions, for working with the equipment, are chosen and the density of the material for separation is considered.
Aluminum Silicates↗
[Basic work environment factors at the Kremikovtsi Coke Chemical Plant].
The investigations, carried out by the institute of Hygiene and Occupational Diseases, for the assessment of toxic-chemical and physical factors of the working environment in the metallurgical-chemical plant showed a high degree of air pollution with dust and high number of toxic substances, many of them manifestating an additive effect or effect of synergism. At certain working places the physical factors have manifested deleterious effect. On the base of the investigations carried out, recommendations are proposed for further investigations on proper assessment of the occupational risk and improvement of labour conditions.
Air Microbiology↗
[New high-capacity sampling device for controlling air dust content].
The construction of a new high-capacity sample taking device, designed for dust pollution control, and furnished with an electric aspirator is described. The device can be used in weight analyses of dust pollution in the air of working rooms and atmosphere alike. The basic feature of the apparatus is the so-called sample taking head which fulfils the functions of measurer and regulator of the capacity within 50-200 dm3/min limits. The measurement filters are made of FPP-15 material with dimeter measuring 80 mm. Sample taking using the above device is conducted in compliance with the requirements of dust control standards adopted in this country.
Air Pollutants↗