The elements of user interaction in social networks are considered: it is shown that the method of analysis of user interactions is based on assumptions when the magnitude of the influence depends on the centrality of users in the social network; the greater the consonance, the higher the nature of the influence, the interaction is a nonlinear function; it is indicated that interaction is a process that has a time interval, the linear model of protection of the information protection system from user interaction is considered; the obtained equations of protection are the equation of a harmonic oscillator with damping amplitude, the iteration of oscillations of the protection system in the pre-resonant, resonant and post-resonant zones is shown.
Computer modelling of stress-strain state (SSS) considering change of physical-mechanical properties, structural transformations and creep strains determined that distribution of plastic strains along the joint butt in diffusion welding (DW) of dissimilar materials is non-uniform. The results of mechanical tests of welded joints provide estimation not for different zones of joint but welded joint integral estimation. Aim of the work is determination of effect of SSS on structure and properties of joints in different zones of joint butt at constant temperature of DW and using temperature cycling. Welding of steel 12Kh18N10T and electric steel 10864 (armco-iron) was carried out at constant temperature 1050 °C and two temperature cycles 700-1000 °C. Welded joints were subjected to microstructural and local X-ray microanalysis. Hardness distribution was studied. Significant attention was made to study of fine structure of metal in joint zone and estimation of specific contribution of different structural constituents in total value of yield strength of the welded joints, considering dependence of dislocation density on value and intensity of plastic strain. Carried investigations confirm the results of SSS computer modelling and presence of significant zone of deformation stagnation in DW with constant temperature. It is determined that DW with temperature cycling allows controlling SSS, intensifying processes of volume interaction and providing full strength of 10864 steel joints. 12 Ref., 6 Figures.
We have a great honor to work together with academician Borys Evgenovych Paton, who by his selfless labor made great contributions to the restructuring of the Academy of Sciences of Ukraine, founded in 1918 by the initiative of Volodymyr Ivanovych Vernadsky, the famous scientist and public figure. During the years of its activity the Academy attained great achievements in many fields of science and technology. Numerous discoveries and inventions were made, many theories and conceptions were put forward, scientific and technical directions were started, the world-known scientific schools were organized, to which the Paton school belongs, which educated and united the scientists in the field of electric welding and related technologies, materials science and metallurgy. All the labor life of Borys Paton is inseparably connected with the Institute of Electric Welding. This is the call of «technical nature», family tradition and son's duty to continue the father's activity. The talent of the famous scientist with a wide sphere of interests was especially pronounced in Borys E. Paton at the post of the Institute director. To define clearly the purpose of investigation, to forecast the most important link in it, to attract interest of a large team of scientists to the new direction are the main tasks of the scientific leader, which were successfully realized by him showing the self ability to work with the team, readiness in supporting of any interesting idea, to assess worthy the fulfilled work. His inexhaustible enthusiasm, unique working ability and respect of each staff member provided the healthy creative atmosphere in the working staff. Over 65 years the work of the Institute under the leadership of Borys E. Paton is the wonderful continuation and implementation of profound and challenging principles of scientific-technical activity of Evgen Oscarovych Paton, the founder of our Institute. The scientific-technical directions, started by Borys Paton, widened greatly the subjects of studies and developments. The purposeful fundamental studies, started at the Institute, became the theoretical bases of welding science, transforming it into powerful means of technical progress, that led to the revolutionary changes in many branches of industry, such as: machine-, ship-and aircraft building, aerospace industry, power engineering, railway transport, mining complexes, metallurgy and chemical production, promoted the creation of pipeline transport, construction industry. Many scientific developments predetermined the world development of welding technologies and went down in history of the science and technology progress. The world authority of B.E. Paton came by comprehensive and fruitful scientific and engineering activity, desire to direct the fundamental research to the solution of actual problems of the scientific-technical progress. By his contributions he made grounds of arc welding, namely the theory of the automatic machines for arc welding, which further was improved by many specialists in the field of the automa...
P u b l i s h e d M o n t h l y Si n c e 2 0 0 0 English translation of the monthly « Av tomatichesk aya Sv ark a» (Automatic Welding) j ournal published in Russian since 19 48 ED I TOR I A L B OA R D Ed i t o r-i n-Ch i e f B. E. P a t o n Su b s c r i p t i o n s 12 issues per year air postage and pack a ging included. Back issues av a ilable. All rights reserv e d. This publication and each of the articles contained herein are protected by copyright.
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