Newtonian Dynamical Systems Admitting Normal Blow-Up of Points

A construction of normal shift along trajectories of a Newtonian dynamical system in the case of an extremely singular initial hypersurface collapsing to a single point is considered. A new class of Newtonian dynamical systems is introduced: systems admitting normal blow-up of points. The class is described in terms of differential equations of normality. Bibliography: 20 titles.     

The influence of crystalline grain size on the thermal stability of the Er<Subscript>0.45</Subscript>Ho<Subscript>0.55</Subscript>Fe<Subscript>2</Subscript> compound

The phase composition and the temperature dependence of the magnetization of the Er_0.45Ho_0.55Fe₂ compound in coarse-grained, microcrystalline, and submicrocrystalline states are investigated experimentally. It is found that, upon heating under vacuum, the Er_0.45Ho_0.55Fe₂ microcrystalline powder with a crystalline grain size of ∼1 μm undergoes decomposition into pure iron and rare-earth (erbium and holmium) oxides and nitrides at a temperature of 500 K. The changes observed in the phase composition of the microcrystalline powder due to annealing are confirmed by x-ray diffraction analysis. Heating of the Er_0.45Ho_0.55Fe₂ submicrocrystalline sample leads to a partial change in the phase composition. The phase composition of a large crystal (∼1 mm in size) remains unchanged upon heating to 1080 K. It is shown that the thermal stability of the Er_0.45Ho_0.55Fe₂ compound depends on the crystalline grain size. __________ Translated from Fizika Tverdogo Tela, Vol. 44, No. 6, 2002, pp. 1060–1063. Original Russian Text Copyright ? 2002 by Mulyukov, Sharipov, Korznikova.     

Crystal Structure of Dioxomolybdenum(VI) Pyrazinecarbohydroximate Tetrahydrate

The crystal structure of a complex of pyrazinecarbohydroxamic acid (PHA) with Mo(VI) has been studied by X-ray diffraction analysis. The PHA molecule enters the complex composition as the enole tautomeric form. The branched intermolecular bonds form a strong three-dimensional framework with cavities filled with water molecules.     

Oxidation of organic sulfides with atmospheric oxygen in the presence of phthalocyanine complexes as catalysts

Catalytic oxidation of a mixture of low-molecular-weight sulfides with atmospheric oxygen was studied. The catalytic activity of poly(cobalt phthalocyanine) in this process is higher than that of monomeric cobalt phthalocyanine.     

Chemically initiated electron-exchange luminescence of Ru(bpy)3Cl2 in catalytic reaction with 1,2-dioxetane

We have investigated chemiluminescence activated by Ru(bpy)₃Cl₂ in the reaction of decomposition of 1,2-dioxetane. Catalysis and activation of chemiluminescence of 1,2-dioxetanes by a ruthenium complex occur according to a mechanism of chemically initiated electron exchange, which leads to effective excitation of Ru(bpy)₃Cl₂ with yield =0.20±0.05.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1316–1321, June, 1991.     

Domain structure of a thin single-crystal plate of terbium iron garnet near the magnetic compensation point

The domain structure of a thin single-crystal plate of the iron garnet Tb₃Fe₅O₁₂ has been investigated using the magneto-optical method in the temperature range near the magnetic compensation point of this ferrimagnet T _c = 248.6 K. It has been shown that, when the temperature of the sample approaches the magnetic compensation point, the domain width significantly increases, but remains finite at T = T _c . The magnetic H-T phase diagram, which determines the boundary between the multidomain and domain-free (uniformly magnetized) states of the sample, has been constructed using the data on visual observations of the transformation of the domain structure with variations in the temperature and external magnetic field. The results obtained have been interpreted in terms of the thermodynamic theory of stability of different magnetic phases of a two-sublattice cubic ferrimagnet near T _c .     

Sodium and Potassium tert-Butyl Peroxide Hydrates: Crystal Structure and Properties

Russian Journal of Coordination Chemistry - Sodium and potassium tert-butyl peroxide hydrates 2Na+·2C4H9 $${\text{O}}_{2}^{ - }$$ ·7H2O (I) and 2K+· 2C4H9 $${\text{O}}_{2}^{ - }$$...     

Sonochemical Synthesis of 5,6-Dihydro[C70-D5h(6)][5,6](1,4- dioxano)fullerene by Reaction of Fullerene with α-Diols

Russian Journal of Organic Chemistry - A procedure has been developed for the sonochemical synthesis of 5,6-dihydro[C70-D5h(6)][5,6]- (1,4-dioxano)fullerene on the basis of heterogeneous reaction...     

Hypoglycemic and Anti-Inflammatory Effects of Triterpene Glycoside Fractions from Aeculus hippocastanum Seeds

Horse chestnut (Aesculus hippocastanum L.)-derived drugs have shown their potential in biomedical applications. The seed of A. hippocastanum contains various kinds of chemical compounds including phenolics, flavonoids, coumarins, and triterpene saponins. Here, we investigated the chemical components in A. hippocastanum L. grown in Uzbekistan, which has not yet been studied in detail. We identified 30 kinds of triterpene saponins in an extract of A. hippocastanum L. Classifying extracted saponins into eight fractions, we next studied the hypoglycemic and the anti-inflammatory activities of escin and its derivatives through in vivo experiments. We came by data indicating the highest (SF-1 and SF-2) and the lowest (SF-5 and SF-8) antidiabetic and anti-inflammatory effects of those eight fractions. These results imply the prospective use of A. hippocastanum L. grown in Uzbekistan in the production of pharmaceutical drugs to treat diabetes and inflammation.