Biomedical subjects

K Dinkova

Publications and source records attributed to K Dinkova.

4 recordsLinked to original sources

PubMed2000

Disturbance of respiratory system in workers in smelter plants.

Workers from smelter plants are at high risk from lung injuries due to exposure to quartz sand, clay, resin, loams, airborne metals etc. The aim of this study was to investigate the relevance of the problem and the risk of occupational pathology in metallurgy at "ELMA" plant--Troyan. The study revealed decreased number of occupational lung diseases but the percentage rate (about 10%) of registered new cases with occupational lung diseases was maintained. No new cases with mixed silicosis were recorded. The results were compared to respective national data. Slowly evolving forms of diffusely outlined lung chart with late functional breathing disturbances were prevailing. Chronic bronchitis are presented as a polyetiologic paraoccupational disease.

Bulgaria↗

PubMed1997

Changes in some psychophysiological parameters in speech information processing under masking noise effect.

The aim of the present work was to study the influence of masking broad-band (white), impulse and interrupted noise with intensities LAeq 60 and 90 dB(A) on the execution of some psychophysiological tasks. The following parameters were studied: pulse frequency and variation, breathing frequency and variation, vascular tone etc. The psychological tasks model different parts of the operators' activity and include: conduction of mathematical calculations at datum speed; test related to the information processing; complex optional task supplied by Piorkovski's device. After statistical processing of results by Student-Fischer's t test and monofactor dispersion analysis it was established that the masking noise effect was more strongly expressed in the execution of psychophysiological tasks connected with the main memory. Of all tested physiological parameters the changes in the peripheral circulation, expressed in elevated vascular tone of peripheral blood vessels, were the most significant.

Adult↗

PubMed1996

[The dust factor of the work and adjacent environments in the working of manganese ore].

The dust professional exposition of the above ground workers in the mines "Obrochishte" at the village of Tsŭrkva, Varna Province has been evaluated as well as the dust pollution in the atmosphere of the village in respect to the hygienic standards for quartz-containing sand and manganic aerosol. The results show that the pollution with quartz-containing dust is in the normal ranges according to all hygienic parameters for fibrogenic dusts in working environment and the workers are not exposed to risk of silicosis. A greater than the standard exposition to manganic aerosol (from 1.1 to 5 PDK) has been found out in some groups of workers in the ore-dressing plant, in truck drivers of the intra-fabric transport, in fadromists and heavy scraper workers. The manganic aerosol is found to be a pollutant of the atmosphere also, and the cause of this is thought to be the mine storages in the open-air and the poor state of the intra-fabric roads.

Aerosols↗

PubMed1995

[The effect of different masking noises on psychophysiological tasks].

This paper describes experimental investigations aimed at clarifying the influence of wide-range (white), pulsed and interrupted noise with intensities Lequ 60 and 90 dB (A) on some psychophysiologic characteristics of problem solving. Physiologic indicators were recorded: pulse rate and variance, breathing rate and variance, vascular tone, ets. Psychologic problems to be solved modeled various features of operator activities, including: performing mathematical computations at a given rate; a test involving information processing; a compound option problem offered by Piotkovski's apparatus. Statistical data treatment (t-test of Student and Fisher, and monofactorial dispersion analysis) indicated the masking effect of noise to be more marked in dealing with psychophysiologic problems relating to operative memory. From the physiologic parameters tested, most informative proved to be the changes occurring in peripheral circulation, notably, the rise in vascular tone to peripheral vessels.

Adolescent↗