Resonant Light Scattering by Optical Phonons in a Homoepitxial n-GaP Nanolayer Grown on a (001)n-GaP Substrate

Physics of the Solid State - The results of detection of resonant amplification of light scattering intensity by optical phonons in a homoepitaxial nanoscale 70 nm thick n-GaP layer grown by...     

Synthesis of N-substituted pyrroles from 1-R-3-R1-3,4-dichlorobutanones

Reaction of acyl chlorides or methallyl chlorides in the present of aluminum chloride gives 1-R-3-R¹-3,4-dichlorobutanones which give 1,2- and 1,2,4-substituted pyrroles with ethanolamine. The dichlorobutanones react with glycine and -alanine to give the N-pyrrolyl derivatives of acetic and propionic acids.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1181–1184, September, 1990.     

On convergence,asymptotic behaviour and computational algorithm of generalized exponential integral functions arising in a radiative transfer

In this paper, we investigate uniform convergence of the generalized exponential integral functions (GEI) arising in the study of radiative transfer in a two-dimensional planar-medium and anisotropic scattering in a multidimensional medium. Using the uniform convergence, we study the properties and asymptotic behaviour of the GEI functions. We also give an efficient algorithm for the computations of the values of the GEI functions.     

Maleic anhydride-styrene-1,4-di(4-isopropenylphenoxy)butane terpolymer as a sorbent for recovery of UO 2 2+ ions from aqueous solutions

Maleic anhydride-styrene-1,4-di(4-isopropenylphenoxy)butane terpolymer was tested as sorbent for treatment of aqueous solutions, including oil-field brines, to remove uranium salts.     

Antioxidant properties of sulfides derived from 2-propylphenol and of their aminomethyl derivatives

Antioxidant properties of sulfides derived from 2-propylphenol and of their aminomethyl derivatives were studied in a model reaction of cumene oxidation. The kinetic parameters of the reactions of these compounds with cumylperoxy radicals and cumyl hydroperoxide were determined.     

Difference equations with a point interaction

In this paper, we consider an impulsive second‐order difference equation on the whole axis. We determine eigenvalues, spectral singularities, continuous spectrum corresponding to this difference equation with an impulsive condition by using the asymptotic properties of Jost functions, and uniqueness theorems of analytic functions. Finally, we demonstrate that the impulsive difference equation has finite number of eigenvalues and spectral singularities with finite multiplicities under certain conditions.     

1-Bromo-3,3-bis(2-bromoethyl)alkanes: Precursors to 4-Substituted Quinuclidines and 1-Phosphabicyclo[2.2.2]octanes

1-Bromo-3,3-bis(2-bromoethyl)octane has been synthesized from tetrahydro-4H-pyran-4-one in 6 steps and 18% overall yield. This method is more convenient, gives higher overall yields and is potentially more general than those previously reported for related tribromides.     

Formation of Metal Powder in Spark Dispersion of Aluminum

The effect of additives introduced into the working solution on the behavior of dispersed aluminum particles formed in spark erosion was studied. The conditions under which products of a given composition are formed were determined on the basis of thermodynamic and kinetic factors.     

Synthesis of aminomethylated derivatives of allylphenols and study of their antimicrobial characteristics in motor oil

A series of nitrogen-containing compounds was synthesized by Mannich condensation of allylsubstituted derivatives of phenol and o-and p-cresols with formaldehyde and secondary amines. These compounds were studied as antimicrobial additives to motor oil (at a content of 1–2 wt %).