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1.
M. V. Zagidullin V. D. Nikolaev M. I. Svistun N. A. Khvatov E. V. Fomin 《Optics and Spectroscopy》2008,105(2):202-207
The concentrations of water vapor and O2(1Δ), as well as the temperature in the gas flow at the exit of a singlet oxygen generator, are determined using multichannel recording of the singlet oxygen emission spectrum in the bands at 634, 703, 762, and 1268 nm. The water vapor concentration is found from the intensity ratio of the 762-nm band, which corresponds to the 1Σ → 3Σ transition of the oxygen molecule, and the dimole emission band at 634 nm. From the ratio of the integrated intensities of the bands at 634 and 1268 nm, the O2(1Δ) concentration is determined and it is shown that the yield of O2(1Δ) at the exit from the gas generator is about 52%. The temperature of the gas flow, determined by the rotational structure of the oxygen emission spectrum in the band at 762 nm, is about 300 K under the nominal conditions of the gas generator operation. The ratio of the photon fluxes in the 703 and 634nm bands of the O2(1Δ) dimole emission is 1.06. The temperature dependence of the dimole emission bandwidths is determined, which can be used for estimating the gas temperature at the exit of the O2(1Δ) generator. 相似文献
2.
O. I. Vernaya V. P. Shabatin T. I. Shabatina D. I. Khvatov A. M. Semenov T. P. Yudina V. S. Danilov 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2017,91(2):229-232
Dioxidine nanoparticles are prepared via cryochemical modification of the pharmacopoeial dioxidine substance. The form of the cryomodified dioxidine is characterized by data from 1H NMR spectroscopy; X-ray diffraction analysis; such thermal analytical methods as TG and DSC; low-temperature argon adsorption; and transmission electron microscopy. It is shown that the cryomodified samples are synthesized in the form of dioxidine nanocrystals 50–300 nm in size, with a crystal structure differing from that of the initial pharmacopoeial substance. The prepared cryomodified dioxidine nanoparticles inhibit the growth of E. coli 52, S. aureus 144, M. cyaneum 98, and B. cereus 9 better than the initial pharmacopoeial substance, and have comparable chronic toxicity. 相似文献
3.
Alekseev I. G. Belov V. V. Brudanin V. B. Guzeev G. G. Danilov M. V. Egorov V. G. Zhitnikov I. V. Zinatulina D. R. Kazartsev S. V. Kobyakin A. S. Kuznetsov A. S. Machikhiliyan I. V. Medvedev D. V. Nesterov V. M. Olshevsky A. G. Pogorelov N. A. Ponomarev D. V. Rozova I. E. Rumyantseva N. S. Rusinov V. Yu. Samigullin E. I. Svirida D. N. Skrobova N. A. Starostin A. S. Tarkovsky E. I. Filosofov D. V. Fomina M. V. Khvatov V. A. Chapaev V. M. Shevchik Ye. A. Shirchenko M. V. Shitov Yu. A. 《Physics of Atomic Nuclei》2019,82(5):415-424
Detection of antineutrino by the reaction of the inverse β-decay can be used for an independent monitoring of a nuclear reactor power. DANSS detector is located directly under a commercial WWER-1000 reactor and counts up to 5000 antineutrino per day, providing the accuracy of 1.5% in 2 days of the flux measurement. A powerful system of the passive and active shielding in combination with the fine spatial segmentation of the detector allows to diminish the contribution of the background processes to a level, negligible in comparison to the statistical error. The influence of the nuclear fuel composition on the neutrino flux can be accounted for based on the input from the NPP staff.
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M. V. Zagidullin N. A. Khvatov M. I. Svistun M. S. Malyshev 《Russian Journal of Physical Chemistry B, Focus on Physics》2013,7(3):196-202
The kinetics of energy-exchange and quenching processes in the O2(1Δ)-I medium plays an important role in the operation of the chemical oxygen-iodine laser. However, up to now, many of the key processes in this medium are not fully understood. In this work, the flow tube technique is used to determine the rate of excitation energy deactivation in the O2(1Δ)-I medium in the presence of small concentrations of water and carbon dioxide. The concentrations of electronically excited species are measured with spectrometers calibrated in absolute spectral responsivity. The effective rate constant for the deactivation of O2(1Δ) molecules in processes involving iodine atoms is determined. The results are compared to those obtained in previous works. 相似文献
7.
M. V. Zagidullin M. I. Svistun N. A. Khvatov A. S. Insapov 《Optics and Spectroscopy》2014,116(4):542-547
Collision-induced emission of singlet oxygen molecules is studied using spectrometers calibrated for absolute spectral sensitivity. The collision-induced emission-rate constants at wavelengths of 479, 514, 577, 634, and 703 nm are determined within the temperature range 90–315 K. It is found that the intensities of the emission bands increase with decreasing temperature below 100 K. The interrelation between the collision-induced emission-rate constants and the intensities of the collision-induced absorption bands is discussed. The Einstein coefficients for spontaneous emission of excited free O2: O2 complexes are estimated. 相似文献
8.
S. G. Karpova A. A. Popov A. V. Khvatov N. S. Klenina A. L. Iordanskii 《Russian Journal of Physical Chemistry B, Focus on Physics》2011,5(1):148-155
ESR spectroscopy, DSC, IR spectroscopy are used to study the molecular dynamics, mechanical properties, the ability to ozone
oxidation of ethylene-propylene copolymer (SEPE) and a copolymer of ether and urethane groups (SPEU). The behavior of the
copolymers under tensile stress changes dramatically upon addition of > 5% ethylene units to polypropylene. Reversible deformation
of oriented copolymers containing <5% ethylene units is accompanied by an increase in molecular mobility, with the opposite
tendency being observed at a higher content of ethylene units. The sorption properties change in parallel with the molecular
mobility. Samples containing >5% ethylene units turn out to be less resistant to ozone oxidation. Upon deformation of isotropic
and weakly oriented SPEU sample, molecular mobility increases at the initial stage of stretching, decreasing throughout the
strain range covered. Ozone oxidation, both in the loaded and unloaded states leads to an increase in the rigidity of SPEU
chains, which manifests itself in the growth of the modulus of elasticity, correlation time, and activation energy. Thermal
annealing in water also increases the rigidity of SPEU molecules. 相似文献
9.
Vernaya O. I. Shabatin V. P. Nuzhdina A. V. Zvukova N. D. Khvatov D. I. Semenov A. M. Lozinskii V. I. Shabatina T. I. Melnikov M. Ya. 《Russian Chemical Bulletin》2017,66(11):2152-2156
Russian Chemical Bulletin - Cryochemical synthesis of hybrid nanocomposites based on the antibacterial drug, dioxidine, and metals (Ag, Cu) was performed. According to the data of H1 NMR, UV, and... 相似文献
10.
M. V. Zagidullin N. A. Khvatov M. S. Malyshev 《Russian Journal of Physical Chemistry B, Focus on Physics》2011,5(6):969-973
The results of our experimental study of the kinetics of formation of O2(1Σ) molecules in energy-exchange reactions O2(1Δ) + I(5
p,2
P
1/2) and O2(a,1Δ) + O2(a,1Δ) are presented. The ratio of rate constants was obtained for these reactions (4800 ± 300). Setting the rate constant of
the deactivation of O2(1Σ) molecules on CO2 molecules at 4.1 · 10–13 cm3/s, we evaluated the rate constants for these reactions at a temperature of approximately 330 K: (1.7 ± 0.2) · 10−13 and (3.6 ± 0.5) · 10−17 cm3/s, respectively. 相似文献