Открытый доступ
Доступ предоставлен
Только для подписчиков
Том 45, № 11 (2018)
- Год: 2018
- Статей: 10
- URL: https://journals.rcsi.science/1068-3356/issue/view/14139
Article
Algorithm for Processing and Analysis of Raman Spectra using Neural Networks
Аннотация
The solution of the problem of processing of a large data set when analyzing Raman spectra of a gas mixture is considered. The algorithm is based on the artificial neural network. Conditions for the use of neural networks in solving practical problems of real-time analyzing spectra, including that for remote search for heavy hydrocarbons are determined. The algorithm speed is estimated using computer aids with sequential and parallel data processing.
331-333
Frequency Shift of Acoustic Oscillations of the Tobacco Mosaic Virus with Varying Suspension Parameters
Аннотация
When low-frequency stimulated Raman scattering (SRS) is excited in the tobacco mosaic virus (TMV) suspension, an anomaly in the scattering line frequency shift is detected, i.e., the dependence on the concentrations of TMV and tris-buffer as the TMV concentration increases. An explanation of the phenomenon, based on the idea of the formation of the hydration shell of the virus capsid is proposed.
334-336
Compact Transportable Optical Standard Based on a Single 171Yb+ Ion (“YBIS” Project)
Аннотация
The schematic diagram of the compact transportable optical frequency standard based on the quadrupole transition in a single 171Yb+ ion with a relative instability at the levelx of 5 · 10−16, less than 1m3 in volume and less than 300 kg in weight is presented. The ionic trap and laser systems are described. Trapping and laser cooling of the 174Yb+ ion are experimentally demonstrated.
337-340
Nanowhiskerography–a New Method of Security Printing using Scanning Laser Radiation
Аннотация
Based on fundamental research of above-threshold-power laser radiation by C. Townes (laser beam splitting) and G. A. Askaryan (self-focusing and sublimation evaporation), a new highperformance technology for growing nanowhiskers of metal and their oxides, semiprecious crystals, and composite materials based on polycarbonate in open air is developed. Some possibilities of its practical applications are shown.
341-345
Modeling of Laser Generation and Propagation of Electron Bunch Along Thin Irradiated Wire
Аннотация
Three-dimensional numerical PIC simulation allowed the detection and study of the formation of an electron bunch moving with relativistic velocity along a thin metal wire during its irradiation with a short laser pulse of relativistic intensity. The bunch motion is accompanied by electromagnetic surface-type pulses.
346-349
Numerical Simulation of Plasmon Excitation in Gold Nanostructure of the Parabolic Nanoantenna Type
Аннотация
Experimentally obtained nanostructures shaped as a through hole with a particle at the center are considered. Their electrodynamic parameters are studied using numerical simulation methods. It is shown that such structures function similarly to parabolic antennas.
350-352
Effect of Laser Exposure on the Process of Silicon Nanoparticle Fabrication
Аннотация
Silicon nanoparticles are obtained by nanosecond laser ablation of a single-crystal wafer under a deionized water layer. Nanoparticle generation mechanisms are studied depending on the incident energy density of laser radiation (7–12 J/cm2) and scanning speed (10–750 mm/s). At a scanning speed of 150–200 mm/s, a maximum of the extinction coefficient of obtained colloidal solutions of nanoparticles is observed, which can be caused by an increase in their mass yield.
353-355
Digital Flat Panel Detectors in Medical Imaging Systems
Аннотация
Main parameters of digital flat panel detectors, to be taken into account in developing imaging systems are considered. Various factors affecting obtained images are presented. Experimental results presented confirm the necessity of image correction.
356-359
On a Phenomenological Approach to Gravity
Аннотация
Applying the theory of sources I consider the consequences of using field theoretical 3- graviton vertex instead of the vertex of general relativity. As an example I look for the lowest nonlinear terms in the exteriormetric of a spherically symmetric body. Themethod suggests that the algorithm of obtaining the metric cannot be reduced to solving the Einstein equation. It also seems that in nonlinear approximation the concept of a test particle moving in external gravitational field can be sustained only for a nonrelativistic particle.
360-368
Instabilities and Annihilation Blockade of Macrospheres in the Gravitationally Neutral Universe Model
Аннотация
Corrections to the spectra describing Jeans instability and acoustic vibrations due to the consideration of annihilation processes in the hydrodynamic model of the gravitationally neutral Universe are obtained. The problem of annihilation of galactic clusters and anticlusters arising at the stages of the formation of massive gravitational clusters in the period following recombination of charged particles of the early Universe is also discussed. By the example of spherical macroscopic objects, it is shown that gravitational repulsion between cluster and anticluster results in the impossibility of their annihilation due to the existence of the finite closest approach distance if the latter exceeds the distance between macrosphere centers.
369-372