The e+e−→ηπ+π− cross section is measured at the Spherical Neutral Detector (SND) detector in the η decay mode η→3π0. The analysis is based on the data sample with an integrated luminosity of 32.7 ...pb−1 collected at the VEPP-2000 e+e− collider in the center-of-mass energy range s=1.075–2.000 GeV. The data obtained in the η→3π0 decay mode are found to be in agreement with the previous SND measurements in the η→γγ mode. Therefore the measurements in the two modes are combined.
Formation of free radicals in mitochondria plays a key role in the development of apoptosis, which includes formation of superoxide by the respiratory chain, formation of radicals by cytochrome ...c-cardiolipin complex in the presence of hydrogen peroxide or lipids, and chain lipid peroxidation resulting in cytochrome c release from mitochondria and initiation of the apoptotic cascade. In this work the effect of taxifolin (dihydroquercetin) and some other antioxidants on these three radical-producing reactions was studied. Peroxidase activity of the complex of cytochrome c with dioleyl cardiolipin estimated by chemiluminescence with luminol decreased by 50% with quercetin, taxifolin, rutin, Trolox, and ionol at concentrations 0.7, 0.7, 0.8, 3, and 10 μM, respectively. The lipid radical production detected by coumarin C-525-activated chemiluminescence decreased under the action of rutin and taxifolin in a dose-dependent manner, so that a 50% inhibition of chemiluminescence was observed at the antioxidant concentrations of 3.7 and 10 μM, respectively. Thus, these two radical-producing reactions responsible for apoptosis onset are inhibited by antioxidants at rather low concentrations. Experiments performed on liver slices and mash showed that taxifolin, quercetin, naringenin, and Trolox have low inhibitory effect on the lucigenin-dependent chemiluminescence in the tissue only at concentrations higher than 100 μM.
This paper discusses the charge-exchange strength functions
of the isotopes
Te. The experimental data of the
strength functions obtained from (
He,
) reactions, as well as the
strength functions ...calculated in the microscopic theory of finite Fermi systems, are analyzed. The resonance structure of the strength function
is examined, and the Gamow–Teller and pygmy resonances are identified. The resonance structure of the strength function
is vital for the calculation and analysis of the process of neutrino capture by atomic nuclei.
A satellite with an electrodynamic stabilization system is considered. To solve the problem of triaxial stabilization of an artificial satellite in an arbitrary position in the orbital coordinate ...system, the question is raised of the possibility of creating an electrodynamic control system for the angular motion of an artificial satellite according to the type of PID controller, which differs from the classical PID controller in that the restoring component of the control moment contains a distributed delay. A theorem concerning the asymptotic stability of the stabilized equilibrium position of an artificial satellite is proved, which confirms that it is possible to create the indicated system of electrodynamic control. The effectiveness of the proposed control system and the feasibility of its application for smoothing transient processes is confirmed by numerical simulation.
The cross section for the process
e
+
e
−
→
ηK
+
K
−
wasmeasured at c.m. energies in the range between 1.56 and 2.00 GeV in an experiment with the SND detector at the VEPP-2000
e
+
e
−
collider. The ...invariant-mass distribution of kaon pairs is consistent with the hypothesis that the transition through the
ηφ
intermediate state makes a dominant contribution to the transition in question.
The process of neutrino interaction with
and
nuclei is studied with allowance for the effect of charge-exchange resonances. The results obtained by calculating the cross section for solar-neutrino ...capture by the isotopes
Mo and
Mo,
, are presented. Use is made of both experimental data obtained for the strength functions
in (
) and (
He,
) charge-exchange reactions and the strength functions
calculated within the theory of finite Fermi systems. The effect of the resonance structure of
on the calculated cross sections for solar-neutrino capture is studied, and the contribution of each high-lying resonance to the capture cross section
is isolated. The contributions of all components of the solar neutrino spectrum are calculated. The contribution of background solar neutrinos to the double-beta decay of
Mo nuclei is estimated.
A comparative analysis of the life cycle of powertrains based on internal combustion engines powered by diesel fuel and natural gas, on batteries, and on hydrogen fuel cells was made. The inventory ...information on the stages of the life cycle of powertrains was collected, including production of structural materials and assembling of powertrain components, production of fuel and power, operation, and recycling/disposal after the service life completion. The results of comprehensive estimation of the energy consumption and СО
2
emissions in the life cycle are presented. The structure of the electric power production in the Moscow oblast was used for the comprehensive estimation of the parameters. The cost of hydrogen at which the powertrains based on fuel cells become economically competitive was estimated.
A numerical and experimental study of the main parameters of a small gas turbine engine is conducted in this paper. An experimental bench was developed for determining both the integral parameters ...(thrust and fuel consumption) of the gas turbine engine and the local parameters (temperatures and pressures) of its gas-air path. Besides, full-scale gas-turbine engine tests Jetcat P200-RX were done with and without gas-air path equipment. The existing small gas turbine engine sample was digitized and the gas flow in its gas-air path was simulated using the CFD method in a three-dimensional setting in ANSYS CFX. A comparative analysis of the results of full-scale tests and CFD modeling was carried out.
The problem of the angular stabilization of a rigid body with an arbitrary triaxial ellipsoid of inertia is solved. The control strategy is based on a kind of a proportional integral derivative (PID) ...controller, where the conventional integral element is replaced with a more flexible control option, which assumes the presence of a distributed delay (integral term) in the control torque. In addition, a nonlinear uniform restoring torque is used for the first time instead of the usual linear restoring torque. Analytical substantiation of the asymptotic stability of the program motion involves a special construction of the Lyapunov–Krasovskii functional. A theorem is proved that provides sufficient conditions for the asymptotic stability of the program mode of angular motion of the body in the form of constructive inequalities with respect to the control parameters. The effectiveness of the constructed control is demonstrated, which provides both the high speed and smoothness of transient processes.
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