The correlation between fatigue and fracture characteristics of titanium alloys

Interrelation between fatigue and fracture characteristics for titanium alloy has been shown basing on the analysis of the fatigue curves equations and fatigue fracture diagrams which incorporate cyclic loading rate and cycles asymmetry ratio. The kinetic diagrams equations parameters can be obtained from fatigue curve equation. The calculated fatigue and fracture resistance characteristics were compared with the experiments for VT1-0 titanium alloy

Dicyclopentadiene Polymerization in Solutions under the Action of Various Catalytic Systems

The kinetics of dicyclopentadiene polymerization in toluene solution under the action of different catalytic systems through adiabatic thermometry was investigated. Unlike cationic metathesis polymerization has a sufficiently large induction period associated with low speed by implantation monomer on carbine bond of catalyst. It has been shown that the rate of metathesis polymerization of dicyclopentadiene in comparable circumstances is about three times lower than the rate of cationic polymerization of the same monomer

Dicyclopentadiene Polymerization in Solutions under the Action of Various Catalytic Systems

The kinetics of dicyclopentadiene polymerization in toluene solution under the action of different catalytic systems through adiabatic thermometry was investigated. Unlike cationic metathesis polymerization has a sufficiently large induction period associated with low speed by implantation monomer on carbine bond of catalyst. It has been shown that the rate of metathesis polymerization of dicyclopentadiene in comparable circumstances is about three times lower than the rate of cationic polymerization of the same monomer

Oxidation and Structuring of Polydicyclopentadiene Thin Layers

It has been shown that polymeric film coatings derived from polydicyclopentadiene are subject to oxidation and structuring in air. Oxidation in air of double bonds in films gradually happens during several weeks and it comes amid an increase of adsorption band of carbonyl and hydroxyl groups in polymers infrared spectrums. Moreover, because of selective oxidation of cis-configured chains, structuring occurs around the double bonds in the polymer chain in polydicyclopentadiene films acquired by metathesis polymerization

Postdocs in Russia: Peculiarities of Employment and Incentives

The article presents the results of the author’s research aimed at identifying the peculiarities of employment of postdocs, a relatively new labor category for the Russian academic labor market. Due to several difficulties associated with forming a sample of postdocs (difficulty in identifying key persons responsible for the development of postdoctoral programs; direct, but not always justified, refusals to provide data, difficulties in identifying potential respondents due to their occupation of various scientific positions in Russian universities), the “snowball” method was used. As a result, the empirical basis of the study was formed based on the results of an online survey of 44 postdocs. As part of the study, tasks related to compiling a socio-economic portrait of a postdoc based on economic, socio-demographic characteristics and indicators of research efficiency, identifying the characteristics of the employment and placement experience of postdocs, objective factors and individual motives for making decisions in the field of choosing postdoctoral programs were solved, as well as diagnostics of tools and channels for young researchers to search for vacancies. The authors distinguish between types of academic mobility (educational and labor) and consider postdoctoral studies as a promising form of external labor academic mobility aimed at attracting and retaining high-potential young researchers planning a long-term career in the academic labor market.Shifting the emphasis from the inbreeding model of university development (internal labor mobility) to the model of external labor academic mobility of young specialists allows those universities that can effectively manage the flow of academic human capital to receive additional socio-economic preferences and return on investment. There are very few similar empirical studies that analyze the features of the development of postdoctoral institutions in Russia and abroad and are based on quantitative and qualitative data from surveys of direct participants in external labor academic mobility – postdocs, which determines the scientific novelty and practical value of the proposed results

CREEP OF POLYTETRAFLUOROETHYLENE UNDER VARIOUS LOADING CONDITIONS

This article contains results of experimental research of polytetrafluoroethylene (PTFE) deformation and creep under linear and plane stresses. During the tests predetermined values of real stresses considering current deformation were constant. The equation of mechanical states considering instant elastic, viscoelastic, instant plastic and viscoplastic components of total deformation was obtained. The equation is used for the description of PTFE deformations (F-4, F-4D, F-4D0) under stationary and non-stationary cyclic loads in flat stress condition with an application of material constant volume condition, condition of similarity of deviators of stresses and deformations and with the input of parameters which are functions of the form of stress deviators. The results of PTFE creep investigation under real stresses reaching ultimate values are relevant and unique

The research of abnormal toxicity and local irritant effect in the Draize test of the drug furacilin, concentrate for the preparation of a solution for local and externaluse

The research of abnormal toxicity and locally irritating effect of the drug Furacilin, concentrate for the preparation of a solution for local and external use in comparison with the drug Furacilin, tablets for the preparation of the solution, was carried ou

Pharmacological activity of new imidazole-4,5-dicarboxylic acid derivatives in dopaminergic transmission suppression ttests in mice and rats

To study the antiparkinsonian activity of new 1,2-substituted imidazole-4,5-dicarboxylic acids in dopaminergic transmission suppression tests in mice and rat