Di(methyl-NON-azoxy)formal as the first example of azoxyformals

Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1598–1600, August, 1995.     

Resistance of thin films with edge superconductivity in strong magnetic fields

It is shown that, in an edge superconducting layer of a thin film in a magnetic field perpendicular to the film plane, phase slip centers are formed. The centers arise below the superconducting transition temperature because of the thermal fluctuations of the order parameter and lead to the suppression of superconductivity. The resistance corresponding to such fluctuations is determined, and the contribution of the Aslamazov-Larkin correction to the conductivity of a thin film in magnetic fields slightly exceeding the critical field that breaks the surface superconductivity is calculated.     

A small-angle x-ray scattering study of the nanostructural features of high-ash carbon materials

Nanostructured carbon-silica composite materials are prepared from different compounds in one-pot. They are characterized by BET, transmission electron microscopy, X-ray diffraction, and small-angle X-ray scattering. An effective method of the quantitative analysis of the structural dispersed characteristics of the template phase of silica in these composites is proposed.     

Reactivity of alkoxy-NNO-azoxy compounds toward hydrazine hydrate and inorganic reducing agents

The chemical stability of alkoxy-NNO-azoxy compounds to reduction with hydrazine hydrate has been studied. Methoxy-NNO-azoxymethane and bis(methyl-ONN-azoxy) formaldehyde acetal are more stable by orders of magnitude than bis(methoxy-NNO-azoxy)methane and 2,2-bis(methoxy-NNO-azoxy)propane. Methoxy-NNO-azoxymethane is also resistant to reduction with titanium(III) under acidic conditions and with iron(II) under basic conditions. Probable reaction mechanisms have been proposed on the basis of the substrate reactivity toward nucleophiles, acids, and alkalies.     

Computer analysis of the source image structure in 3D electron-optic systems: I. An electrostatic system

Computer analysis of the arbitrary source image obtained in 3D electron-optic systems is performed. The systems involve electrostatic fields focusing and deflecting electron beams. Specifically, the structure of a net electron beam from an extended source at the crossover is examined. It is shown that the spread function of the source, which characterizes the imaging quality of the system most fully, may serve as a primary computational criterion.     

Effect of dispersion of orthorhombic anisotropy fields on the ferromagnetic resonance linewidth in iron garnet films

The effect of the dispersion of anisotropy fields on the width of the ferromagnetic resonance line is calculated in films with orthorhombic anisotropy. The results of the calculation, based on a model of linear variation of the anisotropy fields with thickness and on the assumption of additivity of the different contributions to the resulting linewidth, are in good agreement with experimental results. Zh. Tekh. Fiz. 67, 131–134 (August 1997)     

Control over phase transformations in the crystal lattice of ammonium nitrate by modification of the system of intermolecular interactions via addition of organic substances

Methods for phase stabilization of ammonium nitrate were sought for to substantially extend the application fields of this oxidizing agent in self-combustible formulations for various purposes, including the new generation of gas-generating formulations for automobile safety bags. The phase state of ammonium nitrate alloys with minor additions of organic substances with crystallographic parameters close to those of ammonium nitrate was studied.     

Enthalpies of formation of 3,4- and 3,5-dinitro-1-trimethyl-1<Emphasis Type="Italic">Н</Emphasis>-pyrazoles

The standard enthalpies of combustion and formation for isomeric polynitropyrazoles, viz., 3,4- and 3,5-dinitro-1-trinitromethyl-1Н-pyrazoles, were measured by combustion calorimetry in an oxygen atmosphere. The enthalpies of formation for the 3,4-dinitro isomer by 19.7 kJ mol^–1 exceeds the corresponding parameter for the 3,5-isomer.