Изучение модифицированной структуры полимеров методом травления кислородной плазмой
A method based on the spectral analysis of thermowave oscillations formed under the effect of radiation of lasers operated in a periodic pulsed mode is developed for investigating the state of the interface of multilayered systems. The method is based on high sensitivity of the shape of the oscillating component of the pyrometric signal to adhesion characteristics of the phase interface. The shape of the signal is quantitatively estimated using the correlation coefficient (for a film–interface system) and the transfer function (for multilayered specimens).
A method is developed to analyze the state of the interface in a multilayer metallic system; it is based on spectral analysis of a heat_transfer coefficient. A coefficient of correlation is used to find the relation between the spectral characteristics and the thermal conductivity of the interphase interface. The change in the coefficient of correlation induced by 10_MeV electron irradiation of a multilayer W–Mo system is studied.
The article explains a new method of relief marking of heat-shrinkable tubing and sleeves made of polymer materials with "shape memory effect." Method of instrument evaluation of relief marking stereometry of installation parts for aviation equipment, made of polyvinyl chloride, polyethyleneterephthalate and polystyrene was developed and the results were explained. Parameters of pin-point relief marking and compliance of point forms to the Braille font standard were determined with the use of the non-destructive method based on the color of interference pattern with precision of 0.02 mm.
A complex structure is shown to form in the uranium–plutonium nitride U0.8Pu0.2N irradiated by fast neutrons. It consists of a uranium-based solid solution; plutonium, zirconium, yttrium, and lanthanide nitrides; and individual condensed phases such as U2N3, BaTe, CeRu2, LaSe, Rh3Te2, USe, Ba3N2, CsI, Sr3N2, metallic molybdenum, and U(Ru,Rh,Pd)3 intermetallic compounds. The amount and composition of these phases are calculated at temperatures of 900 and 1900 K in the process of depletion to 18% heavy atoms (U + Pu). The variation of the composition of the irradiated uranium–plutonium nitride is studied upon the electron decay of metallic radionuclides. The kinetics of the transformations of 89Sr3N2 and 90Sr3N2 to 89YN +89Y and 90ZrN +90Zr, respectively, is calculated.
The dynamics of a two-component Davydov-Scott (DS) soliton with a small mismatch of the initial location or velocity of the high-frequency (HF) component was investigated within the framework of the Zakharov-type system of two coupled equations for the HF and low-frequency (LF) fields. In this system, the HF field is described by the linear Schrödinger equation with the potential generated by the LF component varying in time and space. The LF component in this system is described by the Korteweg-de Vries equation with a term of quadratic influence of the HF field on the LF field. The frequency of the DS soliton`s component oscillation was found analytically using the balance equation. The perturbed DS soliton was shown to be stable. The analytical results were confirmed by numerical simulations.
Radiation conditions are described for various space regions, radiation-induced effects in spacecraft materials and equipment components are considered and information on theoretical, computational, and experimental methods for studying radiation effects are presented. The peculiarities of radiation effects on nanostructures and some problems related to modeling and radiation testing of such structures are considered.
Let G be a semisimple algebraic group whose decomposition into the product of simple components does not contain simple groups of type A, and P⊆G be a parabolic subgroup. Extending the results of Popov , we enumerate all triples (G, P, n) such that (a) there exists an open G-orbit on the multiple flag variety G/P × G/P × . . . × G/P (n factors), (b) the number of G-orbits on the multiple flag variety is finite.
I give the explicit formula for the (set-theoretical) system of Resultants of m+1 homogeneous polynomials in n+1 variables