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Том 45, № 7 (2018)
- Год: 2018
- Статей: 7
- URL: https://journals.rcsi.science/1068-3356/issue/view/14133
Article
Measurement of the Hydrodynamic Efficiency of Laser Plasma at the “Kanal-2” Installation using Aluminum and Copper Targets
Аннотация
The results of experimental measurements of the hydrodynamic efficiency of laser plasma for aluminum and copper targets are presented. The studies were performed on the “Kanal-2” laser setup system using the ballistic pendulum method. The pressure in the interaction chamber was 10−4 Torr, the pendulum length was 145 mm, the mass of the pendulum with a target was 7.2 g. At the half-height pulse duration of 2.5 ns, the power density on the target surface was ∼1013 W/cm2. In the case of aluminum target, the hydrodynamic efficiency coefficient increased from 1.5% to 4.5% with increasing laser pulse energy from 5 J to 10 J, whereas it remained at the level of 5% for the copper target.
195-198
Pulsed X-Ray Source (PXS) for Calibrating Microdosimeters Based on “Warm Liquids” and Testings of Television Type Detectors
Аннотация
The PXS is developed for calibrating microdosimeters and testing television-type detectors (TVTDs) and quality check of tetramethylsilane (TMS) samples after purification from electronegative impurities. The PXS design and block diagram are described. The pulsed X-ray source based on a solid-state discharger with an advanced system for triggering the controlled discharger and external devices, which have minimum noise characteristics, is described.
199-203
Numerical Simulation Optimization of Selective Heating of Blood Vessels in “Port-Wine Stains” under Laser Irradiation in Various Modes
Аннотация
Numerical simulation of blood vessel heating is used to select the most efficient and safe methods of laser treatment of “port-wine stains”. Selective heating under radiation is calculated for a 980-nm diode laser, a Nd:YAG laser, a copper vapor laser (CVL), and a pulsed dye laser (PDL). The energy exposure range (fluence), the diameter and depth of vessels, at which their selective heating to the coagulation temperature is possible, are determined.
204-208
Change in Graphene Electronic Properties in the Presence of Acetone Vapor
Аннотация
Changes in properties of graphene grown by chemical vapor deposition (CVD) with water adsorbate removal from the graphene–SiO2/Si substrate interface using an organic material, i.e., acetone, are studied. It is found that acetone vapor suppresses grapheme structuring under low-intensity nanosecond laser radiation (wavelength λ = 532 nm). It is found that the electron work function in graphene decreases by ∼0.2 eV, which is presumably due to a decrease in the water adsorbate layer thickness at the mentioned interface.
209-213
Correlation of Aerosol Scattering Lidar and Laser Strainmeter Signals during Earth’s Crust Deformations
Аннотация
Lidar sensing of tectonic aerosol fluctuations in the laser strainmeter–interferometer tunnel during 2017.12–2018.05 at the Schultz cape (131°9′8″ E, 42°34′6″ N) near Vladivostok was performed for the first time to our knowledge. A negative correlation of laser interferometer and aerosol lidar signals was observed during low-frequency Earth crust deformations.
214-217
On the Distribution of Radio Pulsars Above the Galaxy Plane
Аннотация
A mechanism of pulsar accumulation over the galaxy plane, caused by deceleration in the gravitational field and stopping at a certain distance of z from the plane is proposed. For pulsars with velocities close to the average observed velocity of about 300 km/s, the consideration of kinematics of such motion estimates the age of stopped pulsars of the order of ten millions years and the average distance from the galaxy plane of about 2 kpc. The consistency in the pulsar longitude distribution at |z| = 0.45–4.5 kpc and the distribution of the formation regions of massive stars in the galaxy disk was found.
218-222
Morphology of Tungsten Nanooxides, Synthesized by Laser Ablation of Metal in Water
Аннотация
Colloidal solution precipitates obtained during laser ablation of tungsten in water and containing nanostructured metal oxides are studied using X-ray diffraction and scanning electron microscopy. The nanostructure composition and morphology are analyzed. It is shown that the material composing nanostructures is X-ray amorphous, i.e., the particle size does not exceed 1–2 nm. The high degree of the structure surface development implies prospects of their use as substrata when analyzing the composition of various materials by surface-enhanced Raman scattering.
223-225