Improving chaos-based pseudo-random generators in finite-precision arithmetic

Nonlinear Dynamics - One of the widely-used ways in chaos-based cryptography to generate pseudo-random sequences is to use the least significant bits or digits of finite-precision numbers defined...     

Optical waveguides on SiO2 substrates prepared by Pb−Si counterdiffusion

Surface layers of the optimal composition of PbO_0.5SiO_{2 0.5} were prepared on fused quartz substrates by Pb-Si counterdiffusion and their properties were studied experimentally. Prism coupling experiments have shown that these layers can be used as low-mode optical waveguides of good quality.     

Energy Spectra of Alpha Particles in the Interaction of $${}^{{56}}$$ Fe Nuclei with Tantalum and Uranium Nuclei at an Energy of 320 MeV

Physics of Atomic Nuclei - The differential cross sections for alpha-particle emission at an angle of 0 $${}^{\circ}$$ in the reactions induced by a 6-MeV/nucleon $${}^{56}$$ Fe beams incident to...     

Fast Charged Particles in the Interaction of $${}^{{56}}$$ Fe with Be,Ta, and U Nuclei at an Energy of 400 MeV

Physics of Atomic Nuclei - The energy spectra of alpha particles emitted at an angle of 0 $${}^{\circ}$$ in the interaction of 400-MeV $${}^{56}$$ Fe ions with $${}^{238}$$ U, $${}^{181}$$ Ta, and...     

Light conversion in thin films of a mixture of mesotetraphenylporphyrin and erbium-doped yttrium vanadate crystallites: 2. Optical properties

The optical properties of two-component films composed of mesotetraphenylporphyrin (TPP) and erbium-doped yttrium vanadate Yt_0.95Er_0.05VO₄ prepared by spincoating have been studied for the first time. A decrease in the TPP content in the films leads to a hypsochromic shift of the Soret band peak by 1–9 nm; this finding suggests that the degree of aggregation of TPP decreases with decreasing TPP content in the film. The fluorescence peak of TPP is located at an emission wavelength of λ_em = 634 nm and an excitation wavelength of λ_ex = 420 nm. The fluorescence peaks of Y_0.95Er_0.05VO₄ at λ_em = 526, 546, and 555 nm (λ_ex = 300 nm) correspond to the following transitions of the Er3+ ion: the band at 526 nm, to the ² H _11/2 → ⁴ I _15/2 transition; the bands at 546 and 555 nm, to the ⁴ S _3/2 λ ⁴ I _15/2 transition. The fluorescence band peaks preserve their positions with a change in the ratio of components in the film; that is, the fluorescent characteristics of TPP and Y_0.95Er_0.05VO₄ clusters do not depend on their interaction. For both TPP and Y_0.95Er_0.05VO₄, the maximum fluorescence intensity is observed at a TPP content in the film of 40%; the gain with respect to single-component TPP and Y_0.95Er_0.05VO₄ films is 70 and 4–15%, respectively. In this case, a significant effect is exerted not so much by the nature and structure of the components and their interaction as by the topographic features of organization of the photoactive elements in the film, their ratio, and mutual orientation, which determine the energy capture probability.     

Detection of the multiple spallation parameters and the internal structure of a particle cloud during shock-wave loading of a metal

The results of experiments on studying spallation and the ejection of particles from the surfaces of copper and lead samples are presented. A laser interferometry method is used to detect the particle cloud velocity and the multiple spallation parameters. Angular detectors are used to detect the depth profile of the particle cloud velocity dispersion and the structure of metal spallation.     

Erratum to: Fast Charged Particles in the Interaction of 56Fe with Be,Ta, and U Nuclei at an Energy of 400 MeV

Physics of Atomic Nuclei - An Erratum to this paper has been published: https://doi.org/10.1134/S1063778822330018