Complexation of (N, N-diethylthiocarbamoylmethyl) diphenylphosphine sulfide with silver nitrate. The structure of the [Ag{Ph2P(S)CH2C(S)NEt2}2]NO3 complex

(N, N-Diethylthiocarbamoylmethyl)diphenylphosphine sulfide, Ph₂P(S)CH₂C(S)NEt₂, forms a distorted tetragonal bisligand complex [AgL₂]NO₃ with Ag⁺. The stability constant of the complex in acetonitrile was estimated by spectrophotometry (logK=3.7). Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 846–852, April, 1997.     

Synthesis and certain properties of extraction microencapsulated systems

Microencapsulated materials containing di(2-ethylhexyl)phosphoric acid, tributyl phosphate, monoethanolamine, dibenzo-18-crown-6, and 18-crown-6 as extractant were synthesized. Physico-chemical characteristics of the samples were obtained. An effect of extractant and also of a solvent addition in the course of synthesis and also composition of a crown ether on morphology of microencapsulated systems was determined using electron microscopy.     

Oscillating Poiseuille flow in photo-aligned liquid crystal cells

We present an experimental study of thin liquid crystal (LC) layers under the action of a harmonically varied pressure gradient. Optical measurements were performed to register the linear oscillations of a nematic director related to homeotropic and homeoplanar (hybrid) initial states. In the latter case one of the inner surfaces of the rectangular channels was treated by ultraviolet light to provide a relatively weak planar anchoring. The optical response of hybrid and homeotropic LC cells under an oscillating pressure gradient was investigated in relation to on the amplitude and frequency of the pressure gradient. A hydrodynamic model is developed taking into account the LC polar anchoring strength and the surface viscosity responsible for a fast LC surface dynamics. Our estimates show that the thickness of the boundary layer corresponding to the surface viscosity does not exceed 10^-6 m, and further experiments are needed with thinner LC cells and higher frequency oscillations to achieve a more precise value. An oscillating Poiseuille flow in the hybrid cell was found to be useful for characterizing elastic and viscous properties of a weakly anchoring LC surface layer in a fast surface dynamic process.     

Bioactive coatings of porous materials: Fabrication and properties

The methods for producing implants based on a metal matrix with a bioactive coating are described. Porous titanium and titanium nickelide obtained by ion-plasma sputtering are selected as the metal substrate. The bioactive coating is formed from an aqueous suspension of hydroxyapatite. Various methods of deposition are proposed such as vacuum impregnation, its combination with centrifugation, and exposure to ultrasound. Their comparative estimation is given. The surface morphology of the samples is studied by electron microscopy; the characteristics of the surface are estimated by the Brunauer?Emmett?Teller method.     

Shear-Induced Regime of Temperature Gradient Formation in a Thin Nematic Channel

Physics of the Solid State - It has been shown by means of numerical methods, in the framework of the classical Ericksen-Leslie theory, together with accounting the entropy balance equation, how a...     

Asymptotic study of the normal-mode vibrations of a cylindrical shell

Dnepropetrovsk Civil Engineering Institute, Ukraine. Translated from Prikladnaya Mekhanika, Vol. 29, No. 11, pp. 63–67, November, 1993.     

Determining film parameters from the dispersional dependence of waveguide polaritons

Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 54, No. 4, pp. 622–626, April, 1991.     

The Automorphism Group and the Convex Subgraphs of the Quadratic Forms Graph in Characteristic 2

We determine the automorphism group and the convex subgraphs of the quadratic forms graph Quad(n,q),q even.A. Munemasa: A part of this research was completed during this author's visit at the Institute for System Analysis, Moscow, as a Heizaemon Honda fellow of the Japan Association for Mathematical SciencesD.V. Pasechnik: A part of this research was completed when this author held a position at the Institute for System Analysis, MoscowS.V. Shpectorov: A part of this research was completed during this author's visit at the University of Technology, Eindhoven     

Contact interaction of a shell and its base with allowance for their elastoplastic properties

Institute of Technical Mechanics, Academy of Sciences of the Ukrainian SSR, Dnepropetrovsk. Translated from Prikladnaya Mekhanika, Vol. 25, No. 11, pp. 38–44, November, 1989.