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Vol 46, No 2 (2019)
- Year: 2019
- Articles: 8
- URL: https://journals.rcsi.science/1068-3356/issue/view/14150
Article
Estimation of the Backscattered Particle Flux in the PAMELA Calorimeter
Abstract
In the high-energy region, the spectra of cosmic ray particles are measured using calorimeters and particle charge detectors. Particles flying in the directions opposite to those of the cascade development (backscattered flux) can distort the results of such experiments [1, 2]. In this paper, by the example of the particle charge detector and the PAMELA spectrometer calorimeter, the contribution of the backscattered particle flux when determining the primary particle charge as well as determining its energy in the calorimeter is estimated.
41-47
Nanosecond Laser Dewetting and Dehomogenization of a Gold-Palladium Film on a Glass Substrate
Abstract
Dewetting and dehomogenization of a thin gold-palladium film on a glass substrate upon exposure to nanosecond laser radiation are observed. The effect of laser radiation on the film is studied from the viewpoint of the fabrication of structures with surface plasmon resonance. Optical spectra of the structured surfaces clearly show the applicability of this method.
48-50
Exciton and Electron-Hole Liquid Emission under Conditions of Resonant Near-Field Coupling with Localized Plasmon Polaritons
Abstract
The effect of gold nanoparticles on the emission of many-particle states in SiGe/Si quantum wells with thin capping layers is studied. It is found that near the plasmon resonance of the nanoparticles the enhancement factor for the visible-range luminescence of many-particle states in SiGe/Si quantum wells depends on the thickness of the Si capping layer and the type of the many-particle state.
51-53
On the Most Powerful Chiral Influence on Biomolecules in Space
Abstract
Powerful astrophysical sources of chiral influence on biomolecules in the Galaxy and outside it in the cosmic scenario of the origin of life are studied. The effect of such sources and their precursors on sugars is based on right circularly polarized ultraviolet from bremsstrahlung of positrons produced by the radioactive decay of cobalt 56 Co. The maximum mass of radioactive cobalt 56Co is reached during Hypernova explosions; it can exceed ten solar masses. It was shown that the power of chiral ultraviolet from the Hypernova exceeds that from the type 1a Supernova and relativistic fireball approximately by factors of 4.5 and 9, respectively.
54-57
Complex Compounds of Rhenium-188 and Gallium-68 Radionuclides and Their Behavior in the Organism of Laboratory Animals
Abstract
This paper concerns the study of pharmacokinetic properties of rhenium-188 and gallium-68 bound to a ligand based on tetraphosphonic acid (188 Re,68 Ga-EDTMP). The pharmacokinetics of 188 Re,68 Ga-EDTMP is studied using outbred rats after intravenous injection of the preparation; the results are compared with the properties of 188 Re-EDTMP and 68 Ga-EDTMP. Rapid and selective activity accumulation in bone tissue is observed. The peak specific contents of 68 Ga and 188 Re in the femoral bone are 6.85%/g and 2.76%/g, respectively. Throughout the study, the activity of radionuclides in bone tissue was higher than in blood and most soft tissue organs. 188 Re,68 Ga-EDTMP was excreted via the urinary tract. Increased activity is recorded in the thyroid gland. Other organs and tissues are characterized by low contents of the preparation. After intravenous injection of 188 Re-EDTMP and 68 Ga-EDTMP, the activity of 188 Re and 68 Ga is lower in comparison with 188 Re,68 Ga-EDTMP. Thus,188 Re,68 Ga-EDTMP is a promising preparation for theranostics of bone metastases.
58-64
Vortex States with Linear Electronic Spectrum in IV–VI Semiconductor Structures
Abstract
It is theoretically shown that spin-polarized vortex states with linear electronic spectrum can exist in planar homogeneous structures of two-band semiconductors at any sign of the gap parameter. These states are localized at the surface of a cylinder with a microscopic radius, have the total angular momentum of 1/2 and are stabilized when an electric voltage is applied to both sides of the planar sample.
65-69
Measurements of Bragg Peak Profiles by the DTeT Detector
Abstract
Bragg peak profiles are measured by the TV-type DTeT detector. Two-coordinate measurements for the region of energy release in a water phantom are carried out. An experiment with an additional water-filled extension during pulsed irradiation of the water phantom by a proton beam with an energy up to 260 MeV is performed.
70-74
Estimation of the Heat-Affected Zone in Carbon Fiber Reinforced Plastics Exposed to CW Radiation of the Ytterbium Fiber Laser
Abstract
Laser processing of carbon plastics caused the formation of a heat-affected zone (HAZ) degrading service properties of objects. Based on the calculation results for temperature fields, we estimate the dependences of the HAZ on the processing mode parameters for a modern processing plant based on a CW ytterbium fiber laser with a wavelength of 1.06 µm and radiation power of 1 kW. It is shown that to achieve a HAZ ≤ 150 µm required for industrial applications, it is recommended to perform processing in the multipass mode at a beam displacement velocity Vscan ≥ 5 m/s and pause duration between sequential passes of 0.1–0.5 s.
75-79