Нелинейные эффекты при распылении арсенида галлия и кремния кластерными ионами висмута

An experimental study on the influence of the energy and the number of atoms in the bombarding ions Bin+ (n = 1-4) on the sputter yield of GaAs was carried out. It was shown that the specific sputter yield Ysp nonadditively increase with an increasing of n and specific kinetic energy Esp per an atom in the bombarding ion, and the efficiency of energy transfer from bombarding ions to target atoms also increases with an increasing of n. A comparison was made with the previously obtained results for Si targets.

The rise and fall of an extraordinary Ca-rich transient

This work presents the observations and analysis of ATLAS19dqr/SN 2019bkc, an extraordinary rapidly evolving transient event located in an isolated environment, tens of kiloparsecs from any likely host. Its light curves rise to maximum light in 5−6 d and then display a decline of Δm15 ∼ 5 mag. With such a pronounced decay, it has one of the most rapidly evolving light curves known for a stellar explosion. The early spectra show similarities to normal and “ultra-stripped” type Ic SNe, but the early nebular phase spectra, which were reached just over two weeks after explosion, display prominent calcium lines, marking SN 2019bkc as a Ca-rich transient. The Ca emission lines at this phase show an unprecedented and unexplained blueshift of 10 000–12 000 km s−1. Modelling of the light curve and the early spectra suggests that the transient had a low ejecta mass of 0.2−0.4 M⊙ and a low kinetic energy of (2−4) × 1050 erg, giving a specific kinetic energy Ek/Mej ∼ 1 [1051 erg]/M⊙. The origin of this event cannot be unambiguously defined. While the abundance distribution used to model the spectra marginally favours a progenitor of white dwarf origin through the tentative identification of Ar II, the specific kinetic energy, which is defined by the explosion mechanism, is found to be more similar to an ultra-stripped core-collapse events. SN 2019bkc adds to the diverse range of physical properties shown by Ca-rich events.

Use of the optioelectronic ВБХ 731.4 measuring complex in ballistic research

The practice describes the use of certain measuring equipment to determine the affiliation of certain items to firearms. The author analyzes the study of firearms, and conducts an experiment to determine the specific kinetic energy of projectiles to hit a target. To conduct the experiment, the author uses the ВБХ 731.4 measuring complex in accordance with current methods.

A study on the comprehension of differences in specific kinetic energy of TKX-50 and HMX from the perspective of gas products

5,5′-Bitetrazole-1,1′-dioxydihydroxylamine salt (TKX-50), a high-energy energetic material, possesses good safety and energy properties.