Use of aromatic polycyclic hydrocarbons and [Ru(bpy)3Cl2·(OAC)n] for the chemical redox activation of chemiluminescence in the oxidation of organoaluminum compounds by XeF2

Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, p. 2458, October, 1990.     

Study of Properties of Structural Materials of Powerful Pulsed Plasma Facilities under Extreme Loads

Physics of Atomic Nuclei - The effect of high-current relativistic electron beams on samples made of polycrystalline tungsten (Goodfellow) and corrosion-resistant ferrite-martensitic steel EK-181...     

Comparative study of graphene aerogels synthesized using sol−gel method by reducing graphene oxide suspension

A graphene oxide aerogel synthesized from graphene oxide hydrogel and graphene aerogels have been synthesized using the sol?gel method by reducing a suspension of graphene oxide with various reducing agents: a mixture of hypophosphorous acid and iodine, L-ascorbic acid, sodium metabisulfite, and by hydrothermal treatment. The obtained aerogels have been studied by scanning electron microscopy, IR spectroscopy, Raman spectroscopy, X-ray powder diffraction, and X-ray photoelectron spectroscopy. Comparative studies of graphene aerogels have shown that their properties, namely density, specific surface area, reduction degree, surface morphology, defectiveness of graphene sheets, interlayer spacing, average sizes of coherent scattering regions, number of layers, and crystallite size in the basal plane in graphene crystallites depend on the method of synthesis.     

Interaction between the boundary layer and a supersonic flow when part of the wall is rapidly heated

There have been many theoretical studies of aspects of the unsteady interaction of an exterior inviscid flow with a boundary layer [1–9]. The mathematical flow models obtained in these studies by the method of matched asymptotic expansions describe a wide range of phenomena observed experimentally. These include boundary layer separation near the hinge of a flap, the flow in the neighborhood of the trailing edge of an oscillating airfoil [1–2], and the development and propagation of perturbations in a boundary layer excited by an oscillating wall or some other way [3–5]. The present paper studies the interaction of an unsteady boundary layer with a supersonic flow when a small part of the surface of a body in the flow is rapidly heated.Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 1, pp. 66–70, January–February, 1984.     

Effect of surface temperature on the stability of the swept attachment line boundary layer

At fairly high Reynolds numbers instability may develop on the line of attachment of the potential flow to the leading edge of a swept wing and lead to a transition to boundary layer turbulence directly at the leading edge [1, 2]. Although the first results relating to the stability and transition of laminar flow at the leading edge of swept wings were obtained almost 30 years ago, the problem remains topical. The stability of the swept attachment line boundary layer was recently investigated numerically with allowance for compressibility effects [3, 4]. Below we examine the effect of surface temperature on the stability characteristics of the laminar viscous heat-conducting gas flow at the leading edge of a side slipping wing.Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 6, pp. 78–82, November–December, 1990.     

Chemiluminescence during thermal degradation of sodium persulfate in the presence of terbium sulfate: 2. The effect of water of crystallization

An abnormally strong influence of water of crystallization on the intensity of chemiluminescence (CL) in the thermal degradation reaction of sodium persulfate in the presence of terbium(III) sulfate was revealed. As the water is driven off terbium sulfate Tb₂(SO₄)₃ · nH₂O (n= 8–0), the luminescence intensity and light sum increase. The maximum CL intensity for the completely dehydrated sample is 20 times higher and the light sum is two orders of magnitude greater than those of the crystal hydrate containing eight water molecules. It was found that the rise in the CL yield is due to an increase in the yield of excitation of the emitter *Tb(III), rather than the yield of its emission, with a change in the coordination environment.     

Renormalization equations in gravitational theory with higher derivatives

The structure of renormalization equations in gravitational theories with higher derivatives is considered. The gauge dependence of invariant divergences of the effective action is found to be nontrivial. The external source technique is used to construct a consistent Green's function renormalization. One- and two-loop divergences of the effective action are explicitly calculated for an arbitrary parametrization and gauge. These calculations fit the general structure of the obtained renormalization equations. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 121, No. 3, pp. 387–411, December, 1999.