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Vol 45, No 2 (2018)
- Year: 2018
- Articles: 6
- URL: https://journals.rcsi.science/1068-3356/issue/view/14123
Article
To the Problem of the Water Transparency Bandwidth (1.8–11.2 eV) and Hydrogen Bonds
Abstract
It is experimentally detected the gravity center of theOHband of Raman scattering (RS) of picosecond pulses in water shifts by ~40 cm−1 (~0.005 eV) to the high-frequency wing due to shortening the time of observation of the hydrogen bond restructuring in comparison with RS of nanosecond pulses. It was shown that declarative negation of hydrogen bonds and the introduction of the water transparency window half-width (5 eV) or (11.2 eV as seen in Fig. 1 of the paper by V. G. Artemov [Bulletin of the Lebedev Physics Institute 42, 187-191 (2015)] should be regarded as incorrect. These values multiply exceed the well known half-width in the range of 650–360 nm (~1.8 eV [1] which is defined by the fundamental absorption region and OH stretching vibration band overtones from the side of UV and IR regions, respectively.
35-38
On the Generation and Detection of High-Frequency Gravitational Waves Optically Excited in Dielectric Media
Abstract
The possibility of generating and detecting high-frequency gravitational waves based on nonlinear-optical processes in dielectric media at their excitation by intense laser radiation of visible or ultraviolet ranges is analyzed. The theory predicts the feasibility of the Hertz gravitational laboratory experiment in which the parametric conversion of intense laser radiation with frequency ω0 = 2πf0 (f0 = 1014 − 1015 Hz) to a gravitational wave with frequency ωg = 2ω0 and the reverse process of gravitational radiation reconversion to optical radiation are implemented in the condensed dielectric medium.
39-45
46-50
On the Effect of Boundary Conditions in the Ginzburg–Landau Theory on the Results of Calculations of the Critical State of Layered Structures
Abstract
The effect of boundary conditions in the Ginzburg–Landau theory on the critical state of superconducting layered structures is studied. The method is based on the numerical solution of the Ginzburg–Landau nonlinear equations describing the behavior of a superconducting plate carrying a transport current in a magnetic field, provided the absence of vortices in it. The use of the general boundary condition for the Ginzburg–Landau system of equations leads to a change in the order parameter over the thickness of thin superconducting plates. The calculated dependences of the critical current of plates on the magnetic field applied in parallel to layers are used to determine the critical current of multilayered structures. It is assumed that the mutual influence of superconducting layers occurs only through the magnetic field induced by them.
51-55
On the Properties of Transparency Windows Near the Band Gap Edge of One-Dimensional Photonic Crystals
Abstract
In the general case of the confined one-dimensional photonic crystal (PC), the properties of transparency windows near the band gap, in which the field amplitude significantly increases, are studied using the perturbation theory. Expressions for the dependences of the maximum gain of the field amplitude, positions and widths of transparency windows on crystal thickness H and window number n are obtained; in this case, the knowledge of particular types of fields are not required. Expressions for the field in the crystal and the intensities of reflected and transmitted light, which are defined by the fields at the quasimomentum q0 corresponding to the band edge, are obtained.
56-62
Analytical Representation of the Bragg Curve for Operating a TV-Type Detector at the Radiotherapeutic Accelerator
Abstract
A mathematical model of the TV-type detector calculator operation with analytical approximation of the Bragg curve in the simple form for fast calculations is proposed. An analytical formula is obtained, based on the combination of parabolic cylinder functions, well consistent with numerical methods and experimental data, which is valid for proton energies from 60 to 180 MeV.
63-66