Composition and Surface Structure of Boron-Mixed Graphite Exposed to Oxygen Plasma
USB15 boronmixed graphite samples subjected to bombardment with 90eV ions of an accelerated oxygen plasma flow are investigated via scanning electron microscopy, Xray microanalysis, Xray diffraction analysis, and mass spectrometry of the thermaldesorption kinetics and volatile compounds. It is revealed that the surface is enriched with oxygen and irradiation is not accompanied by structural changes. The material possesses an imperfect finegrained structure with a very low graphitization level. Thermaldes orption mass spectrometry indicates that spectral lines of boron oxide appear at temperatures of greater than 150°C and reach their maximum at 320–410°C. This corroborates the assumption that an inert boronoxide film is formed on a cold USB15 surface under the action of oxygen ions and evaporates with increasing temperature. The latter leads to a loss in the protective properties of the boron dopant.
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.