Исследование эрозии полимерных волокон в потоках кислородной плазмы
The paper studies the effect of the dramatic fall in polymeric fiber strength as erosion increases under an oxygen plasma beam. At a relatively small fiber mass loss (20%), the breaking load is reduced by a factor of 20. SEM images reveal that fiber erosion is uneven, and show the deep local etching that leads to fiber breakdown.
The question of calculation of local stability of cylindrical filled shells is considered.In this task the system of rigid fibers, paralleled with one of main curvature lines, is implanted into the shell matrix. The critical load parameter with the axial compression in directions, longitudinal and transverse to the direction of fibers is analyzed.
It has been investigated the corrosion resistance, strength and plasticity of vanadium-based ternary (V-Ti-Cr) alloys in a steam–water medium. It has been found the optimum compositions with the best properties.
Comparative unvestigations are carried out into the effect of irradiation in the flow of oxygen plasma on the sputtering of polymer materials - polyvinyltrimethylsilane, polyimide and polyvinyltrimethylsilane with the additions of carbon nanjparticles. It is shown that the mass loss of the polyvinyltrimethylsilane specimens is 1.5 times smaller than that of the polyimide specimens.
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.
This volume presents new results in the study and optimization of information transmission models in telecommunication networks using different approaches, mainly based on theiries of queueing systems and queueing networks .
The paper provides a number of proposed draft operational guidelines for technology measurement and includes a number of tentative technology definitions to be used for statistical purposes, principles for identification and classification of potentially growing technology areas, suggestions on the survey strategies and indicators. These are the key components of an internationally harmonized framework for collecting and interpreting technology data that would need to be further developed through a broader consultation process. A summary of definitions of technology already available in OECD manuals and the stocktaking results are provided in the Annex section.