Article
Спектральный анализ термоволновых колебаний в слоистых системах
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 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).
It is shown that the calculation of the expectations, standard deviations and coefficients of correlation gives significant errors when using small samples. Error calculating the correlation coefficient is significantly greater than the error calculation of the mathematical expectation and standard deviation. The cause of the error is quantized continuum source data through their representation of a small sample. We give the appearance probability distribution plots of quantization errors and errors arising in the calculation of the correlation coefficient in small samples. These values indicate the presence of significant methodological errors that arise when measuring the correlation coefficients. For small samples of systematic error is significant, but it decreases rapidly with an increase in volume of the test sample. It is proposed to correct systematic error in the additive and/or multiplicative form.
In this work authors presented new approach to investigation of multilayer heterostructures by joint calculation HRXRD and XRR data.
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.
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.
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.