Adsorption-induced Depression of the Strength of Potassium Chloride Grains under the Action of Fatty Amines and Water

The surface activity of higher aliphatic amines and their salts at the interface between their solutions and air, oil, and KCl grains and their influence on the strength characteristics, moisture absorption, and caking of the grains were studied.     

Dependence of the metastability of the magnetic states of two-phase nanoparticles on mechanical stress

The influence of mechanical stress on the magnetic states of multiaxial heterophase magnetic materials is investigated using a model of two-phase nanoparticles. The range of critical fields for the reversal of the magnetic moments of phases is calculated and phase diagrams are built to assess the effect of interface exchange interaction and mechanical stress on the metastability of the magnetic states of two-phase nanoparticles.     

Synthesis in a series of quinoline derivatives

Monomeric substances, 8-methacryloxyquinolines were synthesized with the object of obtaining preparations with prolonged action.For part V, see [1].     

Localization of Surface Plasmon Waves in Hybrid Photodetectors with Subwavelength Metallic Arrays

The spectral characteristics of the hole photocurrent in plasmon photodetectors based on Ge/Si heterostructures with Ge quantum dots combined with regular arrays of subwavelength apertures of various shapes in a gold film on the semiconductor surface are investigated. Dispersion relations characterizing the propagation of surface plasmon waves along the metal–semiconductor interface are determined from the dependences of the photocurrent on the angle of incidence of light. It is established that the plasmonic enhancement of the photocurrent in rectangular aperture array is suppressed as compared to that in circular and square aperture arrays. It is found that, in hybrid structures with rectangular apertures, there exists a range of wave vectors where the energy of surface plasmons is independent of the wave vector of incident radiation. The results are explained by the excitation of dipole modes localized at rectangular apertures with a large aspect ratio by light waves.     

Investigation of W<Subscript>2</Subscript>B and β-WB high-temperature phases in coatings produced by a shaped charge explosion

Coatings containing high-temperature phases of tungsten borides W₂B and β-WB are obtained on titanium and steel targets by a shaped charge explosion. In some regions of the target, microhardness achieves ≥42 GPa. The phase composition of different regions of the coatings is examined by X-ray diffraction. The values of unit cell parameters indicate the formation of phases with variable composition. The crystal structure of β-WB is refined.     

Influence of H<Subscript>2</Subscript>O and SO<Subscript>2</Subscript> on the activity of deposited cobalt oxide catalysts in the processes of reduction of nitrogen(I), (II) oxides with carbon monoxide and C<Subscript>3</Subscript>-C<Subscript>4</Subscript> alkanes

It is shown that palladium–cobalt oxide–cerium catalyst deposited on cordierite catalyzes the reduction of nitrogen(II) oxide with carbon monoxide, and cobalt–iron catalysts in simultaneous reduction of NO + N₂O with C₃-C₄ alkanes retained high activity in the presence of water vapor and sulfur dioxide. The Pd-Co₃O₄/cordierite catalyst exceeds the Pt-Co₃O₄/codierite catalyst in the conversion of NO and CO in the reaction mixture CO + NO + O₂ + H₂O + SO₂. Modification of the Pd-Co₃O₄/cordierite with cerium oxide considerably increases its sulfur resistance.     

A decrease in the superluminescence threshold of composites of an organic dye with nanoparticles

It is established that admixture of Ag, Al, Cu, Ni, Zn, and Fe ₃ O ₄ nanoparticles to a rhodamine 6G solution in ethanol with a concentration of 10⁻² mol/L that fills a cell with a thickness of 600 μm results in a decrease in the superluminescence thresholds by no less than 50 folds. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 77–82, September, 2008.     

Synthesis of substituted thiazoles and oxazoles from 2-amino-1-(p-nitrophenyl)ethanol

New thiourea derivatives have been synthesized by the condensation of 2-amino-1-(p-nitrophenyl)ethanol with aryl and alkyl isothiocyanates. Their cyclization with -bromoacetophenone and methyl monochloroacetate and also their desulfurization with yellow lead oxide have been studied.     

Selective enhancement of the hole photocurrent by surface plasmon–polaritons in layers of Ge/Si quantum dots

It is found that the integration of Ge/Si heterostructures containing layers of Ge quantum dots with twodimensional regular lattices of subwave holes in a gold film on the surface of a semiconductor leads to the multiple (to 20 times) enhancement of the hole photocurrent in narrow wavelength regions of the mid-infrared range. The results are explained by the light wave excitation of the surface plasmon–polaritons at the metal–semiconductor interface effectively interacting with intraband transitions of holes in quantum dots.