The authors describe a way of recovering the clock frequency of laser pulses needed for synchronizing quantum states transmitted from a satellite and recorded at a ground station. Experimental simulations of a session of quantum key distribution between a satellite and a ground station are considered. The data obtained during the experiment are used to test the procedure for recovering the frequency of repetition.
The temperature sensitivity of photoluminescence (PL) of synthesized composites based on differently charged biopolymers with colloidal quantum dots CdSe/ZnS and erythrosin B dye was investigated. The dynamic range of the analytical signal of the intensity of quantum dot photoluminescence broadens under the combined action of temperature quenching and the resonance energy transfer from the quantum dots to the dye, which can be used to create dynamic temperature sensors.
The digital twin was created and a prototype of the power supply system with power transmission via optical fiber was manufactured. This technology belongs to the field of optical, wireless and fiber optic power transmission (OWPT). Verification of correctness of the digital twin operation was carried out. The task of achieving the maximum possible efficiency of the system at varying load was solved. Its value amounted to 14%. The operability of the search algorithm of the double differentiation system developed for this purpose is shown. The principle of its operation consists in the change of optical energy synchronously with the change of load resistance. This allows to reduce losses in the primary and secondary energy converters. In the area of optimal regulation, the algorithm provides the minimum power supply level necessary for the operation of secondary devices, at which the maximum possible efficiency of the whole power supply system is achieved. The presented work is a part of the program of creating an end-to-end intelligent system of the full production cycle of the product, starting from the design of structures of opto- and photovoltaic converters (PC), up to the manufacture of systems adapted to individual customer requirements.
The length of a secret sequence is studied and optimized, depending on the communication session’s splitting of intervals the quantum distribution of the key between a satellite and the ground station. The proposed technique can greatly increase the rate of key generation, due to dynamically changing channel parameters.
Periods of phosphorescence decay of metalloporphyrins upon selective excitation into absorption bands and the atmospheric concentration of molecular oxygen in solution are recorded at 293 K. It is shown that the period of decay of triplet states depends on the polarity of the solvents and the wavelength of excitation.
A zero-phonon line at 488.9 nm (2.53 eV) is observed in the photoluminescence spectra of natural Ia type diamond crystals. The excitation spectrum of the system mirrors the emission spectrum. The 488.9 nm line has phonon repetitions corresponding to an energy of 0.073 eV. Changing the temperature from 77 to 313 K shifts the position of the system by 1.01 nm toward the red region; the drop in intensity and broadening of the full width at half maximum is nonlinear. The characteristics of electron–phonon interaction and the distribution of defects with a zero-phonon line at 488.9 nm in the volume of crystals are similar to the characteristics of defects of a nitrogen–vacancy nature.
The magnetic and optical properties of gold-coated nickel nanotubes obtained by template synthesis have been studied. A change in the relative intensity of an optical beam passing through a solution of nanotubes in a magnetic field perpendicular and parallel to the beam propagation shows the possibility of orienting nanotubes along the magnetic field. The results provide an assessment of the applicability of such nanotubes in combined photothermal and magnetomechanical anticancer therapy.
The authors study spectral characteristics of LiF–UO2 crystals with radiation-induced color centers and their stability under emissions of a blue light emitting diode. A luminescence band with the bandwidth of 500–750 nm is observed upon such excitation, indicating LiF crystals containing a uranium impurity and radiation-induced color centers (F2, ({text{F}}_{3}^{ + })) can be used as a phosphor for white light sources that has high stability due to special radiation treatment.
Water-soluble organic luminophores based on 3-(1,3-benzothiazol-2-yl)-4-hydroxybenzenesulfonic acid were studied both experimentally and by density functional theory for the first time. Because of peculiarities in chemical structure, one of them has a large Stokes shift, which results from excited state intramolecular proton transfer.
The author proposes a biophysical model describing the formation of the main radiation-induced DNA lesions in mammalian and human cells under the action of intense femtosecond pulses in the visible and near-IR ranges.
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