Effect of chemically active medium on frequency dependence of magnetic losses in soft magnetic Fe-based amorphous alloys

The effects of the electrolytic hydrogenation and oxidation and of the interaction of the surface ribbon with water and vapor on the frequency dependence of magnetic losses per magnetization-reversal cycle are studied based on the example of soft magnetic Fe81B13Si 4C2 amorphous alloy, which exhibits a positive saturation magnetostriction. It was shown that, after the hydrogenation and oxidation of soft magnetic amorphous alloys, their frequency dependences of magnetic losses per magnetization-reversal cycle, which are reduced to unit induction, exhibit groups of hydrogen- and oxygen-related peaks in the frequency ranges of 35-55 and 55-80 Hz, which can be explained by the formation of O-A and H-A atomic pairs (where A are atoms of alloy components) and their reorientation in a magnetic field in the course of magnetization reversal at certain frequencies. The formation of analogous groups of peaks for samples of soft magnetic Fe-based amorphous alloys was observed after the interaction of the ribbon surface with water and vapor and after heat treatment in air. This fact confirms the possibility of the hydrogenation and oxidation of the alloys during the aforementioned processes. © 2013 Pleiades Publishing, Ltd

About material and technical equipment of educational processes in electrophysics and electrical engineering

Рассматривается проблема обучения студентов технической направленности. Авторы предлагают новые решения проблемы подготовки по специальности заинтересованных студентов, обучающихся в энергетических ВУЗах страны (в частности в УрФУ).The problem of training students of technical specialties is considered (in the article в статье/in research в исследовании). Authors suggest new solutions concerning about a problem of training interested students who are studying in Power Engineering universities around the country, UrFU in particular, by their specialty

Microbial associations for pneumonia causative agents and level of their resistance to antimicrobial drugs during a new coronavirus infection pandemic

Introduction. Bacterial coinfection and secondary bacterial infection are considered critical risk factors for the severity and mortality of SARS-CoV-2-caused pneumonia. The aim of the study was to analyze a pattern of microbial associations between K. pneumoniae and A. baumannii isolated from the lower respiratory tract discharge and sectional material (lung tissue) of patients diagnosed with pneumonia, and to compare resistance level in monoculture and associations during new coronavirus infection pandemic. Materials and methods. A bacteriological study of 2689 sputum and bronchial washing samples from patients at infectious diseases hospitals, and 1411 lung pathological material samples was carried out. Bacterial isolates were identified by mass spectrometry. Antibiotic sensitivity for isolates was determined by the disk diffusion method. Genetic determinants of resistance to beta-lactam antibiotics were detected by PCR. Statistical data processing was performed using SPSS version 22 software. Results. K. pneumoniae and A. baumannii isolates were predominantly found in two- and three-pathogen associations. It was established that the resistance level of K. pneumoniae isolates in association with A. baumannii is significantly higher compared to that in monoculture for all antimicrobial drugs studied. At the same time, K. pneumoniae in combination with Candida spp. vs monoculture showed significantly lower level of resistance to ciprofloxacin, amikacin, cefotaxime, ceftazidime and amoxicillin/clavulanic acid. K. pneumoniae isolates carried resistance determinants to extended-spectrum beta-lactamases: OXA-48 — (22.5%), OXA-51 — (5.6%), OXA-23 — (4.2%), KPC — 70.9%, NDM — 7%. Of these, 14.1% of strains had the ability to co-produce serine carbapenemases OXA-48 and KPC. Sputum and lung tissue A. baumannii isolates exhibited extremely high multiple resistance regardless of their associations with other microorganisms. Microbiome species similarity in the lower respiratory tract and lung tissue discharge was revealed. The proportion of lung tissue vs sputum resistant strains of K. pneumoniae and A. baumannii was significantly higher. Conclusion. The detection of of multiple drug resistant K. pneumoniae and A. baumannii isolates as well as their associations may indicate aggravated pneumonia severity

Alkoxy compounds - XXIII. Synthesis, properties, PMR spectra, and stereochemistry of 2-alkyl-2-alkoxymethyl-1, 3-propanediols and 2, 2, 5-trialkyl-5-alkoxymethyl-1,3-dioxanes

The reduction of alkoxymethylalkylmalonic esters with lithium aluminum hydride has given previously unknown 2-alkyl-2-alkoxymethyl-1, 3-propanediols, and by the condensation of these with ketones six previously unreported 2, 2, 5-trialkyl-5-alkoxymethyl-1, 3-dioxanes have been synthesized. The PMR spectra of these compounds have been studied and the unsymmetrical boat conformation has been shown for the 2, 2, 5-trialkyl-5-alkoxymethyl-1, 3-dioxanes. The causes of the stereochemical features of the compounds mentioned are discussed. © 1971 Consultants Bureau

Effect of temperature on the exchange bias in FeMn/X/Fe20Ni80 (X = Ta, Gd) films

The influence of temperature on the exchange bias in the Fe50Mn50/X/Fe20Ni80 (X = Ta, Gd) films was investigated. It is shown that in the film structures without a spacer between FeMn and permalloy layers, the temperature dependence of the value of the exchange bias field is non-monotonous. The introduction of an ultrathin spacer leads not only to a change in the magnitude of the interlayer exchange coupling, but also to a change in the behavior of its temperature dependence. © Published under licence by IOP Publishing Ltd.Russian Science Foundation, RSF: 18-72-10044The research work has been financially supported by the RSF grant, project no. 18-72-10044. The authors would also like to thank M.E. Moskalev for obtaining X-ray diffraction pattern of the film samples

Pathological features of the lungs and liver of piglets under conditions of constant vaccination of livestock against circovirus infection

The pathogenicity of PCV 2 in the body of vaccinated piglets was studied based on the results of pathomorphological changes in the lungs and liver of animals. The work was carried out on commercial piglets vaccinated with the vaccine Ingelvak CircoFLEX (Germany) against circovirus. The work used clinical, zootechnical, enzyme immunoassay and pathomorphological research methods. It has been established that under the conditions of ongoing vaccination of piglets against PCV2, 30.3% of piglets still do not have virus-neutralizing antibodies. The main reason for the culling of animals are circovirus diseases that have respiratory clinical signs, as well as signs of multisystem wasting syndrome, determining the safety of the livestock at the level of 68.05%, the average live weight of 1 head at the moment of its transfer for fattening is 40.44±0.78 kg, and the average daily gain in live weight is 346.00±9.18 g. At autopsy, sick piglets reveal an increase in the lungs and liver, and the signs of inflammation in them, as a result of circulatory disorders, damage to the lymphoid tissue, the development of dystrophic and necrotic changes. The results of the research suggest that in order to increase the efficiency of the formation of post-vaccination immunity, specific medical preparations can be used to stimulate the immune response of the body, as well as to enhance the resistance of the lymphoid tissue of the lungs and liver in animals.The pathogenicity of PCV 2 in the body of vaccinated piglets was studied based on the results of pathomorphological changes in the lungs and liver of animals. The work was carried out on commercial piglets vaccinated with the vaccine Ingelvak CircoFLEX (Germany) against circovirus. The work used clinical, zootechnical, enzyme immunoassay and pathomorphological research methods. It has been established that under the conditions of ongoing vaccination of piglets against PCV2, 30.3% of piglets still do not have virus-neutralizing antibodies. The main reason for the culling of animals are circovirus diseases that have respiratory clinical signs, as well as signs of multisystem wasting syndrome, determining the safety of the livestock at the level of 68.05%, the average live weight of 1 head at the moment of its transfer for fattening is 40.44±0.78 kg, and the average daily gain in live weight is 346.00±9.18 g. At autopsy, sick piglets reveal an increase in the lungs and liver, and the signs of inflammation in them, as a result of circulatory disorders, damage to the lymphoid tissue, the development of dystrophic and necrotic changes. The results of the research suggest that in order to increase the efficiency of the formation of post-vaccination immunity, specific medical preparations can be used to stimulate the immune response of the body, as well as to enhance the resistance of the lymphoid tissue of the lungs and liver in animals

Development of simulation model for the site of mining and transportation of ore of the mining and processing plant

This paper presents the results of simulation modeling of the mining and transportation of ore at a mining and processing plant. A hybrid multi agent-simulation approach is used to analyze the bottlenecks of the simulated process. © Published under licence by IOP Publishing Ltd

ESCHERICHIA COLI phenotypic characteristics and antagonistic activity in opisthorchiasis invasion

Opisthorchis felineus invasion in human causes inflammatory and dyskinetic disorders of the gastrointestinal tract accompanied by altered phenotypic characteristics in colon microbiota. The aim of research — study an impact of the Escherichia coli isolate phenotypic characteristics on Klebsiella spp. bacteria, isolated from colonic contents of patients with diagnosed opisthorchiasis as well as E. coli antagonistic activity. Materials and methods. The phenotypic properties of 54 E. coli isolates and 8 genus Klebsiella isolates obtained from colonic contents of patients with diagnosed opisthorchiasis were assessed. Identification of isolates and analysis of proteomic profiles were performed using Maldi BioTyper 3.0 software. 204 co-cultivation datasets were analyzed investigating antagonistic activity of E. coli isolates with varying properties on Klebsiella spp. E. coli and Klebsiella spp. isolates were examined by whole genome sequencing. Results. E. coli bacteria with typical phenotypic characteristics showed significantly more prominent antagonistic activity against Klebsiella spp. A significantly higher level of antagonistic activity against K. oxytoca bacteria vs K. pneumoniae strains. The proteomic bacterial strain profiles were divided into clusters depending on the level of antagonistic activity. E. coli molecular serotyping for O- and H-antigens revealed the genes of enterotoxigenic, enteroinvasive and extraintestinal pathogens in 60.0% of cases. Strains with the highest antagonistic activity index, which are carriers of the genes typical to enterotoxigenic E. coli sequence serotypes O6:H1 and O6:H5, were identified. The genome of such strains consisted of the largest number of virulence gene complexes: adhesins, invasins, toxins, bacteriocins. Multilocus sequence typing and sequence serotyping of E. coli and K. pneumoniae strains established their heterogeneity; K. oxytoca isolates were identified as ST242 and ST176. All strains were characterized by homology of antibiotic resistance markers (oqxA, oqxB, fosA) and a variety of beta-lactam resistance gene variants. Conclusion. It was found that E. coli isolates with typical phenotypic characteristics and carriers of virulence gene complexes exhibited significantly more pronounced antagonistic activity against Klebsiella spp. isolated from colonic contents of patients with diagnosed opisthorchiasis

Stereochemistry of heterocycles - XXXIX. Stereochemistry of 2-methyl-5-alkyl-5-phenoxy-1.3-dioxanes

2-Methyl-and 2,5-dialkyl-5-phenoxy-1,3-dioxanes were synthesized and separated into their geometrical isomers by precision rectification. The configuration and conformations of these isomers were determined by PMR spectroscopy. It is shown that the low-boiling trans isomers exist primarily in the chair conformation with an equatorial phenoxy group, whereas the high-boiling cis isomers exist primarily in the chair conformation with an axial phenoxy group. © 1976 Plenum Publishing Corporation

Rare earth elements materials production from apatite ores

The paper deals with the study of processing apatite ores with nitric acid and extraction of the rare earth elements. The rare earth elements can be successfully separated and recovered by extraction from the nitrate- phosphate solution, being an tributyl phosphate as extraction agent. The developed scheme of the processing apatite concentrate provides obtaining rare earth concentrates with high qualitative characteristics