X-RAY phase analysis (XPA) of a cold-hardening mixture (CHM) and the effect of the mixture properties on the casting

The objectives of this type of research are as follows: identifying the phase composition of the samples under study; assessing the effect of the composition on the mechanical properties of the samples. Prior to the study by the XPA, the authors obtained 9 samples of different compositions to select the optimal composition of cold-hardening mixture (CHM). The method of X-ray phase analysis was selected for the phase composition of the CHM samples. After examining the samples using XPA analysis, molds were made from CHM (resin+clay) according to the composition of sample No. 3. To evaluate the quality of the castings, there was measured roughness

Using high-chromium iron as material for production of the equipping components of mine shafts

This paper deals with service conditions of shaft equipment, in particular, inserts of sliding bearings for the purpose of increasing service life due to material substitution and wear resistance increase. As a new material high-chromium irons are offered. Studies are conducted on a microstructure and wear resistance of prototypes is measured. Experimental data are treated by methods of mathematical statistics which confirm reliability of results. The results obtained make it possible to suggest using high-chromium irons as the direct material to produce inserts of sliding bearings

Studying the binder effect on the properties of briquettes of ferroalloy production waste

The paper shows the results of studies in searching for a binder for briquetting finely dispersed dust (FDD) of ferroalloy production of the Kazakhstan content. The fractional composition and shape of FDD particles were studied. Liquid glass and caustic soda were used as a binder. The research results showed the possibility of using liquid glass as a binder. Experimental briquettes have sufficiently high compressive strength and drop strength, which implies the possibility of their transportation and loading

Thermodynamic modeling and analysis of the structure of a heat-resistant alloy of the Fe-Cr-Ni system

There has been carried out thermodynamic modeling of phase transformations of the Fe-Cr Ni alloy alloyed with titanium and niobium in order to predict the phase composition and to substantiate the concentration of alloying elements of the experimental alloy for parts of metallurgical equipment. The results of microstructural analysis and phase composition of an experimental heat-resistant alloy are presented

Studying the binder effect on the properties of briquettes of ferroalloy production waste

The paper shows the results of studies in searching for a binder for briquetting finely dispersed dust (FDD) of ferroalloy production of the Kazakhstan content. The fractional composition and shape of FDD particles were studied. Liquid glass and caustic soda were used as a binder. The research results showed the possibility of using liquid glass as a binder. Experimental briquettes have sufficiently high compressive strength and drop strength, which implies the possibility of their transportation and loading

Thermodynamic modeling and analysis of the structure of a heat-resistant alloy of the Fe-Cr-Ni system

There has been carried out thermodynamic modeling of phase transformations of the Fe-Cr Ni alloy alloyed with titanium and niobium in order to predict the phase composition and to substantiate the concentration of alloying elements of the experimental alloy for parts of metallurgical equipment. The results of microstructural analysis and phase composition of an experimental heat-resistant alloy are presented

Using high-chromium iron as material for production of the equipping components of mine shafts

This paper deals with service conditions of shaft equipment, in particular, inserts of sliding bearings for the purpose of increasing service life due to material substitution and wear resistance increase. As a new material high-chromium irons are offered. Studies are conducted on a microstructure and wear resistance of prototypes is measured. Experimental data are treated by methods of mathematical statistics which confirm reliability of results. The results obtained make it possible to suggest using high-chromium irons as the direct material to produce inserts of sliding bearings

YIELD AND QUALITY OF SORGHUM IN IRRIGATED AGRO LANDSCAPES OF REPUBLIC OF DAGESTAN

Aim. One of drought-resistant crops that can provide stable high yields is sorghum, which is salt-tolerant, heat-resistant and a flexible crop of versatile use (green forage, silage, hay, grass meal, grain forage). The research conducted in 2010-2013 included studies on the effectiveness of the methods and norms of sowing the sorghum, required quantities of mineral fertilizers to increase the crop yields and nutritional value of sorghum sown in the irrigated lowland areas of Dagestan. Methods. We conducted three field researches. In experiments with grain sorghum (the middle ripening group Zernogradskiy 88) we studied drill and broad-cast methods of sowing, seeding rate, the calculated doses of mineral fertilizers on programmable levels of crop yields: 6 t/ha (N160P112K70), 7 t/ha (N190P128K80) and 8 t/ha (N220P144K90). Seeding rate was 300, 350 and 400 thousand viable seeds per 1 ha; broadcast was chosen as a sowing method.A field experiment with sweet sorghum included promising hybrid crop Debut, fertilizers N140P80K70, N190P110K95 and N240P140K120 to obtain 60, 70 and 80 t/ha of green mass for two mowings, respectively. Results. The use of fertilizers based on a given level of productivity at optimum plant population can significantly improve the nutritional regime of the soil during the growing season of the sweet sorghum and create optimal conditions for nitrogen, phosphorus and potassium security for the crops and thus obtain the planned crop yield. Conclusion. The fodder quality of sweet sorghum varies depending on the nutrient status of the soil and mowing time

The First Case of Foot-and-Mouth Disease Caused by O/ME-SA/IND-2001 Virus in Kazakhstan

In Kazakhstan, foot-and-mouth disease (FMD) outbreaks were recorded in 2011–2013 in the southern and eastern regions where FMD vaccination is in place. In January 2022, in Kiikty village of the Shetsky district, Karaganda Region, Republic of Kazakhstan, cases among cattle clinically similar to foot-and-mouth disease were reported. The aim of the research was to establish the cause of the disease and to perform the typing of the pathogen. Materials and methods. Samples from sick animals were tested using PCR, sequenced and typed in compliance with the protocol developed by the International Office for Epizootic Diseases (OIE). Results and discussion. A cytopathogenic agent has been isolated from the BHK-21 cell culture, identified through real-time RT-PCR and electron microscopically as FMD virus. Molecular genetic studies have revealed that the infection of cattle in the Karaganda Region was caused by the FMD virus circulating in the territory of the countries bordering Kazakhstan (China, Russia, Mongolia) and belonging to type O, topotype ME-SA, genetic line Ind-2001. FMD virus isolated in Kazakhstan is genetically related to the FMD line from Asia and is a new FMDV genotype for Kazakhstan, assigned to the ME-SA topotype of the Ind-2001 genetic line. This study once again proves the need for continuous genetic typing of FMD viruses to improve the effectiveness of preventive measures