155 research outputs found
Effects of Inert Nanoparticles of High-Melting-Point Compositions on Grain Structure and Strength of Ni[3]Al Intermetallic Compounds
The paper represents experimental findings both in the area of effects of nanoparticles of inert high-melting-point TiN compounds on a Ni[3]Al intermetallic grain structure creation in the conditions of high temperature synthesis under pressure, and in the area of impact of grain structure modification on intermetallic compounds' strength factor temperature dependence. It was demonstrated that appending a stoichiometric composition of nanosized particles of high-melting-point inert chemical compounds (TiN) initiates a manyfold loss of average size of grain of Ni[3]Al intermetallic compounds, synthesized under pressure, as well as a sufficient intermetallic compounds' strength rise within a wide range of temperatures (up to 1 000 degree C). Electron-microscopic evaluations of a synthesized intermetallic structure with TiN nanoparticles, showed that, during the process of intermetallic polycrystalline structure creation from high temperature synthesis products melts, TiN nanoparticles are mainly spread throughout the boundaries and joints of grain structure, acting as stoppers of grain boundaries migration
Historical dynamics of metaphoric systems in Russian political communication
The paper investigates the drives for stability and change in the history of Russian political metaphors. It compares Russian and international techniques applied to studying history of political metaphors. The paper depicts the Russian researchers' contribution to the theory and methods of researching political metaphorics, as well as to the theory and practice of historical metaphorology. The coauthors come to the conclusion that the arsenal of contemporary Russian political metaphors represents a complex system that emerged from centuries of evolution as a result of interplay between the drives for stability and change, for preservation of cultural distinctiveness and interaction with other cultures. The study draws a distinction between the periods of "metaphoric storms" and "metaphoric calms" in the history of Russian political metaphor
Effects of Inert Nanoparticles of High-Melting-Point Compositions on Grain Structure and Strength of Ni[3]Al Intermetallic Compounds
The paper represents experimental findings both in the area of effects of nanoparticles of inert high-melting-point TiN compounds on a Ni[3]Al intermetallic grain structure creation in the conditions of high temperature synthesis under pressure, and in the area of impact of grain structure modification on intermetallic compounds' strength factor temperature dependence. It was demonstrated that appending a stoichiometric composition of nanosized particles of high-melting-point inert chemical compounds (TiN) initiates a manyfold loss of average size of grain of Ni[3]Al intermetallic compounds, synthesized under pressure, as well as a sufficient intermetallic compounds' strength rise within a wide range of temperatures (up to 1 000 degree C). Electron-microscopic evaluations of a synthesized intermetallic structure with TiN nanoparticles, showed that, during the process of intermetallic polycrystalline structure creation from high temperature synthesis products melts, TiN nanoparticles are mainly spread throughout the boundaries and joints of grain structure, acting as stoppers of grain boundaries migration
THE NEW APPROACH OF PERMANENT ENDOCARDIAL LEAD EXTRACTION
An attempt to describe some tactical and technical particularities of the new approach of permanent endocardial lead extraction has been made. Extracorporal circulation is used for direct visual control of targeted leads. Additional recommendations for clinical application of new surgical technique are formulated. High efficacy, reproducibility and low rate of complications have been confirmed
Π ΠΈΠ±Π°Π²ΠΈΡΠΈΠ½ ΠΈ Π΅Π³ΠΎ Π°Π½Π°Π»ΠΎΠ³ΠΈ: ΠΌΠΎΠΆΠ½ΠΎ Π»ΠΈ ΡΡΠ°ΡΡΡ ΡΠΎΠ±Π°ΠΊΡ Π½Π°ΡΡΠΈΡΡ Π½ΠΎΠ²ΡΠΌ ΡΠΎΠΊΡΡΠ°ΠΌ?
The review article focuses on the current state of synthetic and biological studies of ribavirin analogs. Ribavirin is a broad-spectrum nucleoside antiviral drug with a 50-year long history of research and application, but its mechanism of action still remains unclear. This article examines contemporary views on the antiviral and antitumor effects of ribavirin and its analogs and describes the contradictions and gaps that exist in our knowledge. In recent years, new nucleoside analogs of ribavirin have been synthesized. These ribavirin derivatives modified at the heterocyclic base, have the potential to become the antiviral and antitumor agents of the new generation. Thus, this paper presents a systematic review of antiviral activities, antitumor activities and structureβactivity relationship (SAR) correlations of 39 ribavirin analogs created in the past 15 years. Biological targets and possible mechanisms of action of these new compounds are also discussed, as well as the prospects and possible directions for further research.ΠΠ±Π·ΠΎΡ ΠΏΠΎΡΠ²ΡΡΠ΅Π½ ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠΌΡ ΡΠΎΡΡΠΎΡΠ½ΠΈΡ ΡΠΈΠ½ΡΠ΅ΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΈ Π±ΠΈΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ Π°Π½Π°Π»ΠΎΠ³ΠΎΠ² ΡΠΈΠ±Π°Π²ΠΈΡΠΈΠ½Π°. Π ΠΈΠ±Π°Π²ΠΈΡΠΈΠ½ β Π½ΡΠΊΠ»Π΅ΠΎΠ·ΠΈΠ΄Π½ΡΠΉ ΠΏΡΠΎΡΠΈΠ²ΠΎΠ²ΠΈΡΡΡΠ½ΡΠΉ ΠΏΡΠ΅ΠΏΠ°ΡΠ°Ρ ΡΠΈΡΠΎΠΊΠΎΠ³ΠΎ ΡΠΏΠ΅ΠΊΡΡΠ° Π΄Π΅ΠΉΡΡΠ²ΠΈΡ Ρ 50-ΡΠΈ-Π»Π΅ΡΠ½Π΅ΠΉ ΠΈΡΡΠΎΡΠΈΠ΅ΠΉ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ ΠΈ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΡ, Π½ΠΎ ΠΌΠ΅Ρ
Π°Π½ΠΈΠ·ΠΌΡ Π΅Π³ΠΎ Π΄Π΅ΠΉΡΡΠ²ΠΈΡ Π΄ΠΎ ΡΠΈΡ
ΠΏΠΎΡ ΠΎΡΡΠ°ΡΡΡΡ Π½Π΅ΡΡΠ½ΡΠΌΠΈ. Π ΠΎΠ±Π·ΠΎΡΠ΅ ΠΊΡΠ°ΡΠΊΠΎ ΠΈΠ·Π»ΠΎΠΆΠ΅Π½Ρ ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΡΠ΅ Π²Π·Π³Π»ΡΠ΄Ρ Π½Π° Π±ΠΈΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΌΠ΅Ρ
Π°Π½ΠΈΠ·ΠΌΡ ΠΏΡΠΎΡΠΈΠ²ΠΎΠ²ΠΈΡΡΡΠ½ΠΎΠ³ΠΎ ΠΈ ΠΏΡΠΎΡΠΈΠ²ΠΎΠΎΠΏΡΡ
ΠΎΠ»Π΅Π²ΠΎΠ³ΠΎ Π΄Π΅ΠΉΡΡΠ²ΠΈΡ ΡΠΈΠ±Π°Π²ΠΈΡΠΈΠ½Π° ΠΈ Π΅Π³ΠΎ Π°Π½Π°Π»ΠΎΠ³ΠΎΠ², ΡΡΡΠ΅ΡΡΠ²ΡΡΡΠΈΠ΅ Π² ΡΡΠΈΡ
Π²Π·Π³Π»ΡΠ΄Π°Ρ
ΠΏΡΠΎΡΠΈΠ²ΠΎΡΠ΅ΡΠΈΡ ΠΈ ΠΏΡΠΎΠ±Π΅Π»Ρ. Π ΡΠ΅ΡΠ΅Π½ΠΈΠ΅ ΠΏΠΎΡΠ»Π΅Π΄Π½ΠΈΡ
Π»Π΅Ρ ΠΏΠΎΠ»ΡΡΠ΅Π½Ρ Π½ΠΎΠ²ΡΠ΅ Π½ΡΠΊΠ»Π΅ΠΎΠ·ΠΈΠ΄Π½ΡΠ΅ Π°Π½Π°Π»ΠΎΠ³ΠΈ β ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄Π½ΡΠ΅ ΡΠΈΠ±Π°Π²ΠΈΡΠΈΠ½Π° ΠΏΠΎ Π³Π΅ΡΠ΅ΡΠΎΡΠΈΠΊΠ»ΠΈΡΠ΅ΡΠΊΠΎΠΌΡ ΠΎΡΠ½ΠΎΠ²Π°Π½ΠΈΡ, ΠΏΠΎΡΠ΅Π½ΡΠΈΠ°Π»ΡΠ½ΠΎ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»ΡΡΡΠΈΠ΅ ΡΠΎΠ±ΠΎΠΉ ΠΏΡΠΎΡΠΈΠ²ΠΎΠ²ΠΈΡΡΡΠ½ΡΠ΅ ΠΈ ΠΏΡΠΎΡΠΈΠ²ΠΎΠΎΠΏΡΡ
ΠΎΠ»Π΅Π²ΡΠ΅ ΡΡΠ΅Π΄ΡΡΠ²Π° Π½ΠΎΠ²ΠΎΠ³ΠΎ ΠΏΠΎΠΊΠΎΠ»Π΅Π½ΠΈΡ. Π ΡΡΠ°ΡΡΠ΅ Π΄Π°Π½ ΡΠΈΡΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΠΉ ΠΎΠ±Π·ΠΎΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ ΠΏΡΠΎΡΠΈΠ²ΠΎΠ²ΠΈΡΡΡΠ½ΠΎΠΉ ΠΈ ΠΏΡΠΎΡΠΈΠ²ΠΎΠΎΠΏΡΡ
ΠΎΠ»Π΅Π²ΠΎΠΉ Π°ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΠΈ ΠΊΠΎΡΡΠ΅Π»ΡΡΠΈΠΉ Β«ΡΡΡΡΠΊΡΡΡΠ° β Π°ΠΊΡΠΈΠ²Π½ΠΎΡΡΡΒ», Π² ΠΎΠ±ΡΠ΅ΠΉ ΡΠ»ΠΎΠΆΠ½ΠΎΡΡΠΈ, Π΄Π»Ρ 39 Π°Π½Π°Π»ΠΎΠ³ΠΎΠ² ΡΠΈΠ±Π°Π²ΠΈΡΠΈΠ½Π°, ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Π½ΡΡ
Π·Π° ΠΏΠΎΡΠ»Π΅Π΄Π½ΠΈΠ΅ 15 Π»Π΅Ρ, ΠΎΠ±ΡΡΠΆΠ΄Π°ΡΡΡΡ Π±ΠΈΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΌΠΈΡΠ΅Π½ΠΈ ΠΈ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΡΠ΅ ΠΌΠ΅Ρ
Π°Π½ΠΈΠ·ΠΌΡ Π΄Π΅ΠΉΡΡΠ²ΠΈΡ ΡΡΠΈΡ
Π½ΠΎΠ²ΡΡ
ΡΠΎΠ΅Π΄ΠΈΠ½Π΅Π½ΠΈΠΉ, Π° ΡΠ°ΠΊΠΆΠ΅ ΠΏΠ΅ΡΡΠΏΠ΅ΠΊΡΠΈΠ²Ρ ΠΈ Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½ΠΈΠ΅ Π΄Π°Π»ΡΠ½Π΅ΠΉΡΠΈΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ
Study of influence of the main ground properties on grounding device resistivity
The value of resistivity of a grounding device depends on specific electrical resistance of ground, therefore, when designing grounding devices it is necessary to take into account layered structure of ground. The paper presents results of a study of influence of the main ground properties such as ground structure and composition, temperature and humidity, that depend on climatic and weather conditions of terrain and season, ground porosity, presence of salts, alkaline and acid residues, depth of occurrence of groundwater by the value of their specific electrical resistances. On example of ground structure of northern and southern areas of Perm region, effectiveness of a method for calculating grounders over the upper and lower layers of ground is shown. The results of calculations in a form of graphical functions of resistance of a vertical grounding device versus its length in a multilayered ground are given. For northern areas of Perm region the use of simplified techniques in calculation of grounding devices only over the upper layer of ground leads to significant deviations in calculated values from the actual ones. The effect of climatic conditions on specific electrical resistance of ground is analyzed. The results of study of influence of rock porosity on specific electrical resistance of ground are presented in example of such rocks as sand, sandstone and limestone. It is shown that specific electrical resistance varies depending on different values of ground porosity in wide ranges: at high values of ground porosity its specific electrical resistance decreases sharply due to the fact that pores can be filled with liquid while increasing conductivity of ground. Thus, this paper substantiates a thesis about the need to take into account basic properties of ground such as stratification, seasonal climate coefficient and porosity, when designing grounding devices of electrical units to ensure safe electrical conditions. In addition, it is shown that considering heterogeneity of the earth greatly improves accuracy of calculation of grounding devices and reduces cost of their design
Individual Style of a Politician in the Light of the Comic
The article analyzes public communication of a well-known Russian public and political figure, ex-Mayor of Ekaterinburg (2013-2018) Eu. V. Roizman. We understand an individual discourse of a politiΒcian as a fragment of the national political discourse, which is characterized through the prism of current trends in the development of public communication. One of the trends is the interrelation of political and entertainment discourse in the media, which manifests itself among other things in the active use by polΒiticians and journalists of all kinds of comic tools. In this paper the comic is considered as a linguistic and pragmatic category with a certain semantic content, and a system of means and mechanisms of expression; the means of the comic are expected to provide a certain impact on the recipient of the political text. They vary in the terms of originality and pragmatic functions, and when incorporating into the political discourse they manifest themselves in the individual style of politicians, public figures and journalists in very different ways.The purpos.Π‘ΡΠ°ΡΡΡ ΠΏΠΎΡΠ²ΡΡΠ΅Π½Π° Π°Π½Π°Π»ΠΈΠ·Ρ ΠΏΡΠ±Π»ΠΈΡΠ½ΠΎΠΉ ΡΠ΅ΡΠ΅Π²ΠΎΠΉ ΠΏΡΠ°ΠΊΡΠΈΠΊΠΈ ΠΌΡΡΠ° ΠΠΊΠ°ΡΠ΅ΡΠΈΠ½Π±ΡΡΠ³Π° Π. Π. Π ΠΎΠΉΠ·ΠΌΠ°Π½Π°
Scaling Analysis of Defect Induced Structure of A6061 Alloy at Dynamic Strain Localization
Plastic strain localization and fracture of dynamically loaded metallic samples, occurred during plug formation, are investigated. These processes are closely related to the instability of plastic flow and can be attributed to structural-scaling transitions in mesodefect ensembles. The multiscale nature of defect structure allows us to use the fractal concept for quantitative analysis of both the fracture surface and the inner structure of a deformed material. The scaling properties of fracture surfaces are established in terms of the roughness index (Hurst exponent) as the characteristics of strain localization and fracture
THE NEW APPROACH OF PERMANENT ENDOCARDIAL LEAD EXTRACTION
Purpose: to explore results of chronically implanted endocardial pacemaker leads extraction with extracorporeal circulation and using sternotomy pump off approach.Methods: bacteriological analysis and electronical microscopy of deimplanted pacing leads were estimated. The short-distance outcomes of surgical treatment are analyzed too.Results: 26 patients were operated and 59 leads extracted. The vast majority of infectious agents were presented by Streptococcus viridians and Staphylococcus epidermidis. One patient had early postoperative bleeding. Another case was complicated by relapse of infection. There wasnβt mortality observed.Conclusion: the pump off approach of extracorporeal circulation is a safe and effective method for endocardial pacemaker leads extraction
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