Article
Влияние облучения высокоэнергетическими электронами многослойной W-Mo системы на спектральные характеристики термоволновых процессов
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 possibility of using periodic pulsed laser radiation for spectral analysis of the thermal properties of multilayer metallic materials is studied. Pulse and frequency characteristics of samples are found. An expression for the transfer constant of a thermal signal in multilayer materials is obtained. A parametric model is used to determine the thermal conductivity of the interface in a three_layer Mo(1 μm)–W(48 μm)–Mo(1 μm) sample from the amplitude–frequency characteristic measured before and after irradiation by 9_MeV electrons.
The irradiation of type EP-838 austenitic stainless steel by electrons in a high-voltage microscope results in decomposition of the solid solution. The decomposition takes place in two stages. The first stage occurs as a spinodal decomposition which tends to form a lattice of rod-like precipitates along the [100] direction. The second stage is connected with the formation of needle-shaped precipitates oriented along the [110] direction.
The work carried out research and development of methods for the dynamic configuration of the smart thing's interfaces on the mobile devices with limited resources. This article describes a mathematical model of the environment for dynamic reconfigurable interfaces of smart things on mobile devices with limited resources, the method of assigning a set of basic interface elements to reconfigure interface of smart things and heuristic algorithm for dynamic smart thing's interface reconfiguration.
Understanding the mechanisms of visual perception is important in the context of both media research and its applications in design practice. Within the functional approach to interface design, eye tracking is an established method to analyze interface efficacy. At the same time, in today's media design, many rules have been established by practitioners and remain untested. In this mixed-method study, we combine web crawling, web analytics and heat map analysis based on eye tracking, and qualitative usability analysis of composite-graphic model of a website. We check whether eye tracking test results (numeric data and heat map analysis) correlate to usability of key pages of a large website, as measured qualitatively according to recommendations of leading design literature. Among large web spaces, university website clusters represent a special type and suit well for our analysis, as they unite very different publics and are multi-task. We elaborate and pre-test the methodology on three sites of leading universities in the USA and Russia (Harvard University, Moscow State University and St.Petersburg State University). Our results suggest that there is no direct link between design-based elements of page usability and numeric eye tracking data, but heat maps show correlation with design quality; this means we need to continue checking the suggested methodology on larger number of assessors.
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.
By using superconducting quantum interference device (SQUID) magnetometry, we investigated anisotropic high-field (H less than or similar to 7T) low-temperature (10 K) magnetization response of inhomogeneous nanoisland FeNi films grown by rf sputtering deposition on Sitall (TiO2) glass substrates. In the grown FeNi films, the FeNi layer nominal thickness varied from 0.6 to 2.5 nm, across the percolation transition at the d(c) similar or equal to 1.8 nm. We discovered that, beyond conventional spin-magnetism of Fe21Ni79 permalloy, the extracted out-of-plane magnetization response of the nanoisland FeNi films is not saturated in the range of investigated magnetic fields and exhibits paramagnetic-like behavior. We found that the anomalous out-of-plane magnetization response exhibits an escalating slope with increase in the nominal film thickness from 0.6 to 1.1 nm, however, it decreases with further increase in the film thickness, and then practically vanishes on approaching the FeNi film percolation threshold. At the same time, the in-plane response demonstrates saturation behavior above 1.5-2T, competing with anomalously large diamagnetic-like response, which becomes pronounced at high magnetic fields. It is possible that the supported-metal interaction leads to the creation of a thin charge-transfer (CT) layer and a Schottky barrier at the FeNi film/Sitall (TiO2) interface. Then, in the system with nanoscale circular domains, the observed anomalous paramagnetic-like magnetization response can be associated with a large orbital moment of the localized electrons. In addition, the inhomogeneous nanoisland FeNi films can possess spontaneous ordering of toroidal moments, which can be either of orbital or spin origin. The system with toroidal inhomogeneity can lead to anomalously strong diamagnetic-like response. The observed magnetization response is determined by the interplay between the paramagnetic-and diamagnetic-like contributions.
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.