MAGNETIC PROPERTIES OF FILM STRUCTURES BASED ON PERMALLOY WITH REDUCED Fe CONTENT

In this work, we investigated hysteresis properties and domain structure of x 100-x Fe Ni (x = 0–20%) films. Two cases were considered: x 100-x Fe Ni monolayers and 20 80 x 100-x Fe Ni /FeMn/Fe Ni exchange-biased multilayers.Работа выполнена при поддержке Минобрнауки России, проект RFMEFI57815X0125

Flip Distance Between Triangulations of a Simple Polygon is NP-Complete

Let T be a triangulation of a simple polygon. A flip in T is the operation of removing one diagonal of T and adding a different one such that the resulting graph is again a triangulation. The flip distance between two triangulations is the smallest number of flips required to transform one triangulation into the other. For the special case of convex polygons, the problem of determining the shortest flip distance between two triangulations is equivalent to determining the rotation distance between two binary trees, a central problem which is still open after over 25 years of intensive study. We show that computing the flip distance between two triangulations of a simple polygon is NP-complete. This complements a recent result that shows APX-hardness of determining the flip distance between two triangulations of a planar point set.Comment: Accepted versio

MONITORING COMPOSITION AND STRUCTURE OF MOCVD ZrO2-BASED MULTICOMPONENT FILMS BY INNOVATIVE MIXED METAL-ORGANIC PRECURSORS

Three volatile mixed-metal precursors [ZrL4Pb(hfa)2] (1), [ZrL4PbL2] (2), and [ZrL4La(dpm)3] (3) (L = 2-methoxy-2,6,6-trimethyl-3,5-heptanedionate; dpm = 2,2,6,6-tetramethyl-3,5-heptanedionate; hfa = 1,1,1,5,5,5-hexafluore-2,4-pentanedionate) are used to prepare ZrO2-based multicomponent films by metalorganic chemical vapor deposition (MOCVD). The deposition experiments are carried out in a hot-wall reactor at 600-750 °C on silicon substrates under 20 Torr in the presence of oxygen. According to X-ray powder diffraction, the main crystal phases in the films prepared from precursors 1 and 2 are solid solutions based on tetragonal and cubic ZrO2. Lead does not form separate crystal phases but is dissolved in the oxide form within the ZrO2 matrix, as is indicated by X-ray photoelectron spectroscopy data. La2Zr2O7 films are prepared from 3 using two ways of precursor supply: evaporation in argon and by direct liquid injection (DLI). It is shown that the composition and structure of obtained films are determined by the precursor composition. The results obtained for thermal behavior of precursors in condensed and gas phases are discussed

Сорбция платинохлористоводородной кислоты модифицированными углеродными материалами

The influence of oxidation and impregnation of the carbon materials on the sorption of H2PtCl6 was studied. The state of platinum on the surface was studied with the SEM, EDS, XPS and XAFS methods.Изучено влияние окисления и импрегнации углеродного материала на сорбцию H2[PtCl6]. Методами РЭМ, ЭДС, РФЭС и ЕXAFS изучено состояние платины на поверхности