Fluorescence saturation phenomenon for dissolved organic compound
Fluorescence saturation phenomenon for dissolved organic compound
S.V. Patsaeva, V.V. Fadeev, E.M. Filippova, V.V. Chubarov, V.I. Yuzhakov
Specific features of the effect of fluorescence saturation for an organic compound dissolved in water were studied after fluorescence was excited by an LGI-505 nitrogen laser ($\lambda = 337$ nm, $\tau = 8$ ns, photon flux density $F = 10^{26}$ cm$^{-2}$ $s^{-1}$). The experimental data obtained are discussed in terms of the model concepts of the origin of the fluorescence band for the dissolved natural organic compound.
Show AbstractConcentration dependence of spectral and luminescence features for solutions of pyrazoline dyes
Concentration dependence of spectral and luminescence features for solutions of pyrazoline dyes
0.Yu. Rodionova, S.N. Shcherbo, V.I. Yuzhakov
A study on the concentration dependence of spectral and luminescence properties of Luminophor 59 solutions in toluene, dioxane, dimethylformamide, and ethanol has shown that this dye forms associates at concentrations greater than $10^{-5}$ mole/liter. This conclusion has been supported by the data on the luminescence parameters. The quantum yields and lifetimes of fluorescence have been determined for the dye studied.
Show AbstractAlgorithms for multiparameter reconstruction of spectral and luminescence characteristics by the fluorescence saturation method
Algorithms for multiparameter reconstruction of spectral and luminescence characteristics by the fluorescence saturation method
N.Ya. Serov, V.V. Fadeev, A.M. Chekalyuk
Considered is the possibility of using fluorescence saturation curves to find the following molecular parameters: (i) the quantum yield of triplet states, (ii) the lifetime of the first excited singlet state $S_1$, and (iii) the absorption cross section for a transition from the ground state to $S_1$ at the wavelength of excitation. Algorithms for a simultaneous determination of two and three parameters have been proposed. Requirements to the accuracy of saturation curve measurements were found by mathematical modeling. The results of an experimental check-up of the proposed solution algorithm for a three-parameter problem are presented for the case of eosine aqueous solution.
Show AbstractGeophysical factors of asymmetry origination in precursors of biological systems
Geophysical factors of asymmetry origination in precursors of biological systems
V.A. Tverdislov, M.R. Kuznetsova, L.V. Yakovenko
A hypothesis is formulated which holds that breaking of symmetry in nature occurred in the prebiological evolution stage at the nonequilibrium ocean-atmosphere interface, and origination of aerosols from the ocean surface layer with inverted composition predetermined subsequent biological evolution.
Show AbstractInvestigations of velocity field in flows of complex structure
Investigations of velocity field in flows of complex structure
E.P. Anisimova, V.V. Petrov, A.A. Speranskaya, M.V. Shitov
The hydrogen bubble method is used to study the structure of a flow of dense liquid moving in a quiescent liquid of a lower density. It is shown that in the mixing layer with stratified density distribution the velocity profile can be calculated by the Prandtl formula provided the effect of the density field on the velocity is taken into account.
Show AbstractZ parameters of a piezoelectric transducer for solid-state gravitational antennas
Z parameters of a piezoelectric transducer for solid-state gravitational antennas
A.V. Gusev, A.V. Tsyganov
A system of $Z$ coefficients is computed for a piezoelectric transducer as a minor shift generator of a Weber-type solid-state gravitational antenna.
Show AbstractThe effect of semiconductor-metal phase transition on the hydrate layer on vanadium dioxide films
The effect of semiconductor-metal phase transition on the hydrate layer on vanadium dioxide films
A.V. Zoteev, N.L. Levshin, S.Yu. Poroikov
The influence of the semiconductor-metal phase transition on the hydration and dehydration processes in polycrystalline vanadium dioxide fihns has been studied by electrophysical and mass-spectroscopic methods. An enhanced desorption capacity and accelerated adsorption-desorption processes were observed in the temperature region corresponding to the phase transition and also in the vanadium dioxide metal phase.
Show AbstractModeling and analysis of the energy spectra of $\delta$ electrons generated by ultrarelativistic hadrons
Modeling and analysis of the energy spectra of $\delta$ electrons generated by ultrarelativistic hadrons
B.I. Goryachev, N.V. Lin'kova
The authors present the results of mathematical modeling of an experiment designed to determine the parameters of the electromagnetic structure of hadrons by analyzing the energy spectra of $\delta$ electrons generated by the hadrons.
Show AbstractDiffraction by dielectric discontinuities in a partially dielectric-filled below-cutoff waveguide
Diffraction by dielectric discontinuities in a partially dielectric-filled below-cutoff waveguide
V.V. Gruzdev, V.P. Modenov, Yu.A. Pirogov, E.E. Fominova
Diffraction of the wave $H_{10}$ by the below-cutoff section of a partially dielectric-filled waveguide has been considered. The problem is solved in an exact electrodynamic statement. Mathematical modeling is done by the generalized scattering matrix method. Propagation constants are obtained by differentiation with respect to a parameter. The dependence of numerical modeling results on the number of modes is studied. The results of the numerical analysis and physical experiments are compared.
Show AbstractVisual observation of the spatial distribution of output radiation from a Cerenkov microwave oscillator based on relativistic electron beam
Visual observation of the spatial distribution of output radiation from a Cerenkov microwave oscillator based on relativistic electron beam
A.F. Aleksandrov, S.Yu. Galuzo, A. M. Kuznetsov
A procedure is described for observation of the spatial distribution of microwave radiation generated by a relativistic heavy-current pulsed Cerenkov-type oscillator. The technique uses the microwave breakdown in air occurring under low pressure in a thin-layer chamber formed by the surfaces of two dielectrics.
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