The study of the structure and properties of a wear-resistant gas-thermal coating containing tungsten

The paper presents the results of reverse engineering including metallographic, mechanical, and engineering-technical studies of used rods of a compressor produced by the Dresser-Rand company (Siemens, Germany). The study established that the original product is made of AISI 4140 steel with a working coating based on tungsten carbide applied to a depth of 0.2 mm by the HVOF method. The paper contains the results of the development of an import-substituting technological process for producing a wear-resistant powder coating of the Ni–Cr–B–WC system applied by cold gas flame spraying on the surface of a critical unit of compressor equipment in the oil and gas industry. Microanalysis identified that the sprayed spherical WC particles are evenly distributed in the nickel bond without the formation of free cavities at the lamella boundary, retain the size identical to the original powder composition upon the high-speed collision with the substrate, and minimize the level of residual mechanical stresses in the surface layer. The study shows that the sprayed coating has a high microhardness (the bases – 700 HV0.1, WC – up to 2000 HV0.1), which ensures high wear resistance during operation of the rod in a friction pair. A comparative analysis of the tribological properties of the coatings showed that when changing the shape, particle size distribution, and percentage ratio of tungsten carbide from 20 to 70 % in the nickel matrix, the overall wear resistance of the coating equivalently increases. The authors concluded on the possibility of manufacturing an import-substituting product using the gas flame spraying technology with metallurgical powder compositions containing tungsten. The authors developed an industrial technology for applying a wear-resistant coating on the working surface of a rod made of AISI 4140 steel. The paper presents the results of the analysis of the stress state of a material with a coating produced using the developed technology in comparison with the original product. In the product obtained by the experimental technology, in the process of applying the coating and its subsequent mechanical processing, uniform residual mechanical stresses are formed that do not exceed the value of the difference in the principal mechanical stresses. The paper presents the results of the study obtained both on standard samples and on a pilot part

Thermal Raman study of Li4Ti5O12 and discussion about the number of its characteristic bands

Lithium battery industry is booming, and this fast growth should be supported by developing industry friendly tools to control the quality of positive and negative electrode materials. Raman spectroscopy was shown to be a cost effective and sensitive instrument to study defects and heterogeneities in lithium titanate, popular negative electrode material for high power applications, but there are still some points to be clarified. This work presents a detailed thermal Raman study for lithium titanate and discusses the difference of the number of predicted and experimentally observed Raman-active bands. The low temperature study and the analysis of thermal shifts of bands positions during heating let us to conclude about advantages of the proposed approach with surplus bands and recommend using shifts of major band to estimate the sample heating

Transformation of Resource Allocation Processes Based on Digital Technologies

The article seeks to reveal the features of the transformation of the processes of resource provision of enterprises. In fact, a mechanism for providing resources based on digital technologies for the implementation of enterprise development programs has been developed. New approaches to the interaction of enterprises for creating digital models of development process management are formulated. A system of interaction between enterprises in the digital economy is proposed, which makes it possible to make decisions when allocating resources effectively. Among the main problems identified is the low efficiency of the methodological mechanism for resource allocation. Based on the outcomes, it can be concluded that the creation of digital technology is becoming one of the main advantages of the mutual linking of sources of the resource base at all levels of management

Discovery of a novel non-narcotic analgesic derived from the CL-20 explosive: Synthesis, pharmacology, and target identification of thiowurtzine, a potent inhibitor of the opioid receptors and the ion channels

The number of candidate molecules for new non-narcotic analgesics is extremely limited. Here, we report the identification of thiowurtzine, a new potent analgesic molecule with promising application in chronic pain treatment. We describe the chemical synthesis of this unique compound derived from the hexaazaisowurtzitane (CL-20) explosive molecule. Then, we use animal experiments to assess its analgesic activity in vivo upon chemical, thermal, and mechanical exposures, compared to the effect of several reference drugs. Finally, we investigate the potential receptors of thiowurtzine in order to better understand its complex mechanism of action. We use docking, molecular modeling, and molecular dynamics simulations to identify and characterize the potential targets of the drug and confirm the results of the animal experiments. Our findings finally indicate that thiowurtzine may have a complex mechanism of action by essentially targeting the mu opioid receptor, the TRPA1 ion channel, and the Cav voltage-gated calcium channel

Distinctive features of thermal treatment of potential tool steel 70X3G2FTR

It was defined the influence of thermal treatment parameters on qualities and structure-phase composition of potential die steel for hot working 70X3G2FTR and made the simulation of temperature stressed condition of hammer die by thermal treatment

Spherical-Shape Assumption for Protein–Aptamer Complexes Facilitates Prediction of their Electrophoretic Mobility

The pdf file describes the results of this study, which aims at developing a model to accurately predict electrophoretic mobilities of protein–aptamer complexes. The excel file contains source data for electropherograms (signal vs time) which were obtained in this study and used to determine the migration times and electrophoretic mobilities of proteins, aptamers, ssDNAs, protein–aptamer complexes, and protein–ssDNA complexes. Additional sheets in the excel file contain values of all migration times and mobilities obtained from the electropherograms

Pilot study of the influence of a communicator’s speech characteristics on a recipient’s willingness to maintain interaction in cross-cultural online communication

The success of cross-cultural online communication in an academic environment is defined by the degree of student involvement in such an interaction. The authors’ experience testifies that a number of objective, language, and psychological factors may decrease the activeness of these interactions, and as a result learning may not be effective for students in these types of cross-cultural interactions. Among such factors the current article investigates the influence of a communicator’s speech peculiarities on a recipient’s willingness to maintain interaction in native-to-nonnative, written online communication in the English language. The study was aimed at verifying a hypothesis about the influence of Russian communicants’ speech characteristics on American communicants’ willingness to maintain conversations. The research method chosen was content analysis. Thematic chats involving Russian and American students participating in the Global Understanding course were analyzed. The results of the content analysis allowed us to distinguish certain Russian communicants’ written speech characteristics, such as the prevalence of language and grammar mistakes, the degree of vocabulary richness, and the use of complex sentences. Significant correlations were discovered between the American communicants’ willingness to maintain conversations and the number of mistakes, indicators of lexical richness and scarcity in Russian communicants’ utterances. Language and speech mistakes as well as the quantity of words in the utterances of micro themes had the highest number of significant correlations with indicators of the willingness to maintain conversations. The first factor, language and speech mistakes, decreased the willingness to maintain conversations, whereas the second factor, the number of words in Russian students’ utterances, increased such willingness

Distinctive features of thermal treatment of potential tool steel 70X3G2FTR

It was defined the influence of thermal treatment parameters on qualities and structure-phase composition of potential die steel for hot working 70X3G2FTR and made the simulation of temperature stressed condition of hammer die by thermal treatment