Penetration of a rigid cone into a plastic orthotropic half space

Translated from Zhurnal Prikladnoi Mekhaniki i Tekhnicheskoi Fiziki, No. 5, pp. 159–163, September–October, 1991.     

Resonance Radiative Collision of Charged Particles in an External Magnetic Field

We analyze bremsstrahlung due to collision of a relativistic electron with an ion in an external longitudinal magnetic field. Within the framework of the perturbation method, a general expression for the electric field of radiation is derived. It is shown that the magnitude of the resonance peak of the spectral line is determined by the small dissipative force of radiation reaction. The influence of the external field on the specific intensity and polarization of the wave is analyzed in detail.     

Study of the phase composition of AgI microcrystals by exciton spectroscopy and differential scanning calorimetry

Differential absorption spectra of RbAg₄I₅ have been measured in the exciton absorption region of AgI within the temperature range 27–250 °C. In the same temperature range, the temperature behavior of the heat capacity of RbAg₄I₅, Rb₂AgI₃, and KAg₄I₅ have been obtained by differential scanning calorimetry. An analysis of the results suggests that, in AgI microcrystals less than r _cr in size, the upper boundary for stability of the low-temperature β modification is higher by several tens of degrees. Fiz. Tverd. Tela (St. Petersburg) 40, 852–854 (May 1998)     

Copolymers of acrylic acid with urea

Composition and rheological characteristics of aqueous solutions of acrylic acid/urea copolymers were studied, including the composition dependences of the equivalent conductivity and viscosity.     

Investigation of the solvation's processes of the ions in non-aqueous solutions by IR spectroscopy

IR spectra of solutions of LiCIO₄ (1), NaCIO₄ (2), LiI (3), NaI (4) in binary acetone — acetonitrile solvent were investigated in the region of CN (1–4), CC (1,3) and CH (3,4) stretching vibration bands of acetonitrile and CCC group (1) asymetric stretching vibration band of acetone at the wide range varying of the composition of the binary solvent. Infrared studies were also carried out on solutions of LiCIO₄ and NaCIO₄ in CH₃CNC₂H₅OH mixtures. The C N (1,2) and CC (1) stretching bands of acetonitrile were measured for 0.7–1.0M of CH₃CN. The observed intensities of IR bands allowed to calculate the solvating abilities of used solvents and to estimate the change of solvation sphere composition.     

Synthesis and Some Transformations of 2-(3-Amino-1-Phenylpropyl)furan

A preparative method was developed for the synthesis of ethyl furfurylidenecyanoacetate. Its condensation with phenylmagnesium bromide gave ethyl α-cyano-β-(2-furyl)hydrocinnamate, the decarboxylation of which led to β-(2-furyl)hydrocinnamonitrile. Reduction of this nitrile with lithium aluminum hydride gave 2-(3-amino-1-phenylpropyl)furan. Some of its transformations were studied.__________Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 517–521, April, 2005.     

Kinetics of flocculation and thickening of precipitates of bentonitic clay suspension in the presence of acrylamide copolymers in aqueous salt solutions

The kinetics of hindered sedimentation and thickening of the sediments of a real disperse system (bentonitic clay suspension) was studied. The flocculation parameters of acrylamide copolymers in aqueous and aqueous salt solutions were evaluated in relation to the chemical nature and concentration of flocculants and electrolytes.     

Vibrational spectra of cyclopropenes. II. IR spectra of 1,2-disubstituted cyclopropenes

The IR spectra were measured and the vibrational problem was solved for the 1,2-dimethyl-3-phenylcyclopropene (I) and 1,2-diphenylcyclopropene (II) molecules. The forms of the normal vibrations were determined, and the vibrations associated with vibrations of the exo- and endocyclic bonds of the ring were distinguished. It was shown that substitution at the double bond of cyclopropene leads to a change in the form of the symmetrical vibration of the ring in comparison with the vibration of unsubstituted cyclopropene. It was shown that a significant hypsochromic shift of the band of the symmetrical ring vibration in 1,2-disubstituted cyclopropenes in comparison with cyclopropenes that do not contain substituents at the C^1,2 atoms is due chiefly to the kinematic effect of the substituent. It was found that the introduction of substituents at the double bond of the ring leads to a decrease in the force constant of the double bonds.St. Petersberg University. Translated from Zhurnal Strukturnoi Khimii, Vol. 34, No. 1, pp. 125–132, January–February, 1993.     

Stepwise Photoionization of 1,2-Dihydroxybenzene Vapor

The stepwise ionization processes of 1,2-dihydroxybenzene vapor at 315–275 and 266 nm were studied by the techniques of mass spectrometry, total ionization current spectroscopy, and zero electron kinetic energy spectroscopy. A two-step ionization process yielding the molecular ion prevails at a laser intensity up to 10⁷W/cm². As the radiation intensity increases, fragmentation takes place via the dissociation of molecular and fragment ions due to absorption of one additional photon. The formation pathways of principal fragment ions are discussed.     

Derivatives of isoquinoline. 30. Synthesis of 4-spirosubstituted dioxenoisoquinolines

Methods have been developed for the synthesis of 1,4-benzodioxanyl-6-ethylamine with cyclopentyl and tetrahydropyranyl substituents in the -position. These compounds have been used as starting materials for the synthesis of new heterocyclic systems, the 4-spirocyclosubstituted dioxinoisoquinolines.For Communication 29, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 677–680, May, 1993.