Control over spectral characteristics of electromagnetic pulses

A theory was elaborated on transition radiation (TR) from electron bunches that pass through diaphragms of various geometries. At the base of this theory are induced charges and currents in the conductive diaphragms that are generated by electron bunches. An important role of the earth points of diaphragms was proven experimentally and theoretically. A feasibility study was made on controlling the spectra of electromagnetic pulses (EMP) and their directivity patterns. A new configuration for the diaphragms was proposed: twin diaphragms. Calculated and experimentally measured were spectra of such EMPs that were formed by the induced conduction current during the flight of the electron bunch through the twin diaphragms.     

The vitamin status and indices of immunity in workers in the metallurgical industry in Zapoliar'e]

Some parameters of vitamin providing and immune status were studied in 133 workers and employees of metallurgic industry in Zapolyarie. The data obtained have evidenced that the contingent studied was insufficiently provided with ascorbic acid, vitamins B1, B2, B6, had low content of vitamin A and beta-carotene. Combined vitamin deficiency was recorded in 88.6% of 44 workers subjected to investigations. A total of 87.7% of persons with low vitamin levels had shifts in the immunity system. The highest disorders in the cellular immunity parameters were observed in subjects with polyhypovitaminosis. The results of the study have necessitated taking measures for correction of vitamin providing.