Application of a Magnetic Mirror to Increase Total Efficiency in Relativistic Magnetrons.

The relativistic magnetron is the most compact and efficient high-power microwave source. In order to further increase the total efficiency of microwave generation in a relativistic magnetron with diffraction output with a low-energy state of electrons that is formed between two virtual cathodes (VCs) in the interaction space, the second VC at the downstream end of the interaction space is replaced with a magnetic mirror that reflects all leakage electrons back into the interaction space. Previously these leakage electrons were deposited on the anode surface without interacting with the microwaves.

Rapid start of oscillations in a magnetron with a "transparent" cathode.

We report on the improvement of conditions for the rapid start of oscillations in magnetrons by increasing the amplitude of the operating wave that is responsible for the capture of electrons into spokes. This amplitude increase is achieved by using a hollow cathode with longitudinal strips removed, thereby making the cathode transparent to the wave electric field with azimuthal polarization. In addition, an optimal choice of the number and position of cathode strips provide favorable prebunching of the electron flow over the cathode for fast excitation of the operating mode.

[State of the reproductive function in women who had lymphogranulomatosis in childhood and adolescence].

As many as 33 women who received combined treatment (fully successful) at an age of 5-26 years for lymphogranulomatosis were examined. In 30 patients, the structure and function of the reproductive organs was within age norm. In 20 women, there were 20 deliveries at an age of 19-33 years, with the mean age amounting to 23 years; 10 boys and 10 girls were born.

[Ultrasonic diagnosis of intrauterine fetal infection in pregnancy of a high-risk group].

Ultrasonic scanning of 315 pregnant patients with infectious inflammatory diseases and 200 healthy pregnant women has demonstrated the echographic markers of intrauterine fetal infection: hydramnios, the presence of meconium in amniotic fluid, untimely maturation and signs of infectious involvement of the fetus, increased size of fetal abdomen as against the reference values after 35 weeks gestation. Twenty-six of the 37 mothers of the newborns with pyoseptic diseases had presented with at least three of these signs. Ultrasonic scanning is recommended for antenatal diagnosis of intrauterine infection as an objective method.

[A program to lower perinatal morbidity and mortality in women with multiple pregnancies].

A total of 511 females with multiple pregnancy (486 with twins and 25 with triplets) were examined for the nature of fetal development, and management of pregnancy, labor and postpartum period. An early diagnosis was found to play a decisive role in the implementation of therapeutical and preventive measures. A classification of the prenatal development of monozygotic twins was presented.