Design of STRAUS-R accelerator

The paper presents a design of the direct-operation high-current electron accelerator STRAUS-R that is a modification of STRAUS-2 now in force. The accelerator is aimed at generating single bremsstrahlung pulses in the mode of electron beam focusing on the target. According to the calculations it should provide for getting the dose (Si) of 0.2÷0.25 Gy at a 1 meter distance from the target, the electron beam current being equal to 50÷60 kA, boundary energy of electrons – to 2.7÷3.0 MeV, bremsstrahlung pulse duration – to ≤ 50 ns and beam diameter on the target – to ≤ 5 mm. The description and results of numerical simulation of physics processes taking place in the accelerator are given

Numerical simulation of the processes of small-diameter high-current electron beam shaping and injection

With the aid of BEAM25 program there was carried out the numerical simulation of the non-stationary process of shaping a small-diameter (≤ 20 mm) high-current hollow electron beam in a diode with magnetic insulation, as well as of the process of beam injection into the accelerating LIA track. The diode configuration for the purpose of eliminating the leakage of electron flux to the anode surface was updated. Presented are the results of calculation of the injected beam characteristics (amplitude-time parameters of a current pulse, space-angle distributions of electrons etc.) depending on diode geometric parameters

First Historical Eruption of Kambalny Volcano

The first historical eruption of Kambalny volcano began on March 24, 2017 with the powerful ash emission from the summit crater reaching as high as 6 km above sea level. The explosive activity continued without interruption from March 24 to March 30. The most powerful ash emission was registered on March 25–26, when the ash plume drifted several thousand kilometers SW, S, and SE from the volcano. On April 2 and April 9, after several calm days, powerful ash explosions occurred generating ash plumes up to 7 km high. The area of the land and sea over which the ash plume drifted during the day of March 25, was 650000 km2; the area of the ash accumulation on the land that was formed from March 24 to April 9, exceeded 1500 km2. These parameters were measured using the satellite-based data in the VolSatView information system. Domination of the silty fraction and the presence of secondary minerals (pyrite, gypsum, sulfur, and others) in the ash point to the phreatic character of the volcanic eruption

ВЛИЯНИЕ ВОКАЛЬНЫХ И ФИЗИЧЕСКИХ УПРАЖНЕНИЙ НА СРОЧНЫЕ ИЗМЕНЕНИЯ ВАРИАБЕЛЬНОСТИ СЕРДЕЧНОГО РИТМА

The effect of breathing exercises on the autonomic balance is investigated. It was found that after breathing exercises there was a decrease in the parasympathetic effect on heart rate variability and the growth of the sympathetic component.Исследовано воздействие дыхательных упражнений на вегетативны баланс. Было выявлено, что после дыхательных упражнений происходило снижение парасимпатического влияния на вариабельность сердечного ритма и рост симпатического компонента