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Search results: concentration

Number of results: 12


Problems of ensuring labor protection and safety at the enterprise
Annotation:

The article describes the relationship of man as a species with nature. It is shown that this relationship is determined by the conditions of existence, the quality of air and water, the necessary elements of nutrition. It is also pointed to the role of environmental conditions-optimal for the body, determining human health and life expectancy

Year of release: 2018
Number of the journal: 3(71)

Monitoring of drinking water in the water supply system of Ekibastuz city
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On the basis of research on bacteriological indicators of the water supply system in the Ekibastuz region for the period 2016-2018 the 310 cases of detection of pathogenic microflora were identified. The chemical indicators are given the results of research to determine the content of toxic elements and heavy metals in the source and purified water, as well as in the distribution network of Ekibastuz. The largest number of pathogenic microflora cases and a high concentration of chemical elements are noted during the flood season. Sporadic pathogenic microflora and chemical elements are also recorded in the winter and summer periods.

Year of release: 2019
Number of the journal: 2(74)

Studying the effectiveness of silanization of laboratory glassware for chemical analysis of surface active substances
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The article discusses the mechanisms by which surfactants interact with a glass surface. The need for a preliminary silanization procedure was studied using laboratory glassware in the chemical analysis of lowconcentration surfactants. Rules were proposed for carrying out the silanization procedure.

Year of release: 2019
Number of the journal: 3(75)
Heading: Natural sciences

Residual chemical analysis of amines used as corrosion inhibitors
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Main problem: Presence of acidic chemicals such as carbon dioxide and hydrogen sulphide, composition of production fluids triggers corrosion. Corrosion in oil and gas industry leads to deterioration of equipment since most of equipment is made of metal alloys. Application of inhibitors is one of the corrosion mitigation methods that needs to be controlled because it is important to identify optimal concentration of the chemicals in production fluids.Residual chemical analysis plays an important rolein identifying the appropriate dosage of corrosion inhibitors and its correction. It is imperative to find the most optimal concentration of amines due to the fact that both overdose and underdose could lead to equipment deterioration. The chemical analysis is hindered by complexity of mixtures that are applied in petroleum industry. Purpose: The main purpose of this article is to find out the most effective method of residual chemical analysis for inhibitors used against sweet and sour corrosion by studying and analyzing corresponding literature review. The analysis should be carried out with robust, sensitive, and accurate instrumentation. Methods :Theoretical study of composition and mechanism of amines used in oil and gas industry as corrosion inhibitors and selection of appropriate instrumental analytical techniques for the residual analysis. Results and their importance: After careful studying and consideration of modern instrumental analytical techniques the most optimal and efficient method in terms of robustness, time saving and cost was selected. Ion chromatography is an adequate method to carry out residual chemical analysis for amines that are used as inhibitors in oil and gas industry to prevent sweet and sour corrosion.

Author: Zh.S. Kassenova
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Morphofunctional characteristic of endocrine part of pancreas under affecting of γ-HCH
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In the last decades of the twentieth century, in the national economy of many countries, organochlorine pesticides were most widely used, characterized by stability in the external environment, the ability to cumulate in various tissues of organisms. Lindane (the gamma isomer of hexachlorocyclohexane) is listed as a restricted persistent organic pollutant and is an ecotoxic substance with severe and chronic effects on the human body. The study of the effect of lindane on carbohydrate metabolism at the present stage is still insufficient. This fact led to the study of the effect of γ-HCH on the insulinogenic function of the pancreas in in vivo and in vitro experiments. In experiments in vivo, the animals of the experimental groups were once orally administered γ-HCH at a dose equal to 1/5 DL50. Isolated pancreatic islets, precipitated in vitro and fixed on mica plates, were exposed to γ-HCH in amounts equivalent to 1/5 to 1/4 DL50. Paraffin sections of pancreatic tissue from experimental and control animals were stained with aldehyde fuchsin according to Gomori, and tissue preparations were also examined by a highly specific method for detecting insulin in β-cells using diethylpseudoisocyanin staining, followed by examination of the preparations in the ultraviolet light of a luminescent microscope.The same methods were used to study preparations of isolated pancreatic islet tissue on the 4th day of cultivation. The influence of orally administered γ-HCH on the level of immunoreactive insulin in the blood of experimental animals was also studied. The insulin level was determined by the enzymatic-immunological method. The concentration of IRI was established before the start of the experiment and 4-4.5 hours after acute inoculation. Results and their significance. In the study of stained preparations of the pancreas of experimental animals, numerous islets of ordinary sizes were revealed, the cytoplasm of which was filled with aldehyde-fuccin granularity in quantities indistinguishable from those observed by microscopy of preparations of control animals. The value of the fluorescence coefficient in the histofluorimetric study of the control and experimental preparations did not differ significantly. However, the content of IRI in the blood serum showed a distinct decrease in the first hours after priming. In experiments in vitro, when studying the effect of γ-HCH on cultured tissue, introduced into the nutrient medium on the second day, in the field of view of the microscope, single, small pancreatic islets were revealed. Their number on a constant area of the plates was significantly lower than the value of the same indicator in the study of control preparations. Thus it has been shown that γ-HCH does not affect the histostructure of the endocrine pancreas, but causes a significant decrease in IRI in the blood serum, as well as a change in the histochemical characteristics of cultured β-cells.

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Prospects for the use of natural food additives in the production of sausage products
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Today, there is a full development of the food industry. It is characterized by the widest mechanization and automation of production and transport processes, the use of artificial cold and vacuum technology, the latest physical methods, chemical and biological preparations to accelerate technological processes. There are a huge variety of new products. New ways of long-term preservation of products in hermetic airtight packaging are promising. Now it is possible to deliver products from almost any industry to anywhere in the world. But the main problem for the modern consumer is that today's food industry is moving by leaps and bounds in the application and addition of chemical food additives: preservatives, flavors, dyes, stabilizers, antioxidants and substitutes for raw materials. To correctly answer the question of how to treat the use of food with food additives, it is necessary to understand and weigh the main disadvantages and advantages of using them. Advantages are that the product is better preserved, has an attractive appearance. Disadvantages are that the human body wears out, processing various chemicals, it is harmful to health. And with certain doses of use it becomes dangerous. Everyone has their own attitude to their health and their own priorities in life. Many people have come to terms with the daily use of products with additives, but others consciously refuse almost everything in the store. But the fact that no one wants to be poisoned from an overdose of various chemicals or starve to death. Therefore, the main advice is to carefully study the composition indicated on the label of food products and know the measure of their consumption. It is also impossible to believe blindly that the label was written with the truth. Manufacturers often use additives literally visually, which can lead to the production of a product with a dangerously higher concentration. It also happens that the manufacturer intentionally exceeds the norm in order to hide the shortcomings of the product (stale, poor quality of raw materials) and increase the yield of the finished product. The food additives added to many foods (usually designated by the code E) are predominantly harmful to the body. With moderate consumption, the use of products with E-supplements is not too harmful to the body (for example, several times a month). The situation is dangerous when a person consumes products with a large number of food additives daily or even several times a day when using various products. Nowadays, there are several hundred food additives with the code E (from E100 to E1521).

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Peculiarities of psychological training of military servants to actions in extreme situation
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There are many examples of crises and catastrophes in the history of mankind. Almost the entire spectrum of natural disasters is possible in Kazakhstan. In particular, earthquakes, floods, fires in forests and steppes, snowstorms, and others. In all mountain and foothill zones, there is a danger of landslides, the threat of snow drift. In addition, there are situations that have arisen for man-made reasons. These catastrophes are the result of human activity. Such extreme situations require the concentration of all physical and psychological capabilities of a person. This is especially important for military personnel who often operate in extreme or critical conditions. Psychological readiness to solve such situations gives the individual confidence in the correctness of their own actions and, in the end, leads to a successful result. The purpose of this article is to present the results of research in the framework of a master's thesis. The main focus is on the analysis of the features of psychological training of military personnel to act in an extreme situation. The studied problem is revealed by the authors from the point of view of modern approaches to the psychological training of military personnel in a critical situation. The research methods used (analysis, generalization, experiment) allowed us to reveal the depth of the problem relevant to military psychology. The research is based on the results of modern research by Kazakh and foreign scientists. Approaches to the interpretation of the essence of the content of the concept "extreme situation" are considered, and the factors that determine the specifics of psychological training of military personnel to act in a crisis are highlighted. The concept of "psychological readiness of military personnel to work in critical (extreme) situations" is defined. Statistical results of the experiment are presented. The experimental activity carried out in the course of experimental work has a high practical significance, since it was successfully tested through the implementation of the work of the military unit 3176 "K" in Pavlodar and can be used in the psychological training of military personnel. The article is devoted to the actual problem of psychology. The results presented in the article may be useful for military psychologists.

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Investigation of the dependences of the rheology of calcium alginate solutions on concentration, temperature and shear rate
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The main problem: The rheological properties of calcium salts are of theoretical and practical interest for a modern researcher. The theoretical interest is primarily related to the search for general patterns and manifestations of the rheological properties of solutions of calcium salts. The practical component is based on the search for patterns and dependencies of the properties of solutions on the structure and composition of the object of study. Such chemicals as calcium salts are of particular practical interest, they are widely used in various fields, such as the food, chemical and pharmacological industries. Hydrophilic high-molecular solutions of alginates, namely calcium alginate, are actively used in the preparation of soft dosage forms, the manufacture of jelly masses in confectionery, act as thickeners in the food industry. They are characterized by a fairly high percentage of viscosity at low concentrations, bioavailability, prolonging effect, absence of irritating properties, biocompatibility with many polymers, which is especially important in the pharmaceutical industry and medicine. The use of calcium salts for these purposes is currently very promising, since these organic salts have a number of unique properties associated with gelation. Purpose: This paper contains the results of studying the features of the rheology of calcium alginate solutions. A concentration range of 0.1-0.7 % was chosen for the studies, which is sufficient to avoid gelation at room temperature. The dependence of viscosity on concentration, temperature (in the range of 25-45 °C) and shear rate were studied. Methods: Analysis of theoretical sources, observation, comparison of results. The rheological characteristics of the obtained substances were studied using a capillary viscometer. The measurements were carried out in the temperature range of 25-45°C. Results and their significance: it was found that there is a significant dependence of viscosity on concentration and temperature. For concentrations of 0.3 – 0.7 %, a similar type of dependence is observed, in contrast to solutions with a concentration of 0.1 % . Explanations of these dependencies were proposed.

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Application of resource-saving membrane technologies in the production of dairy products in the Republic of Kazakhstan
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In Kazakhstan, within the framework of the Program «Development of domestic value and export-oriented industries», new modern dairy enterprises are being actively modernized and new modern dairy enterprises are being created, where membrane processes are being introduced to concentrate the components of milk. This is necessary for the rational and integrated use of raw materials, including through the processing of secondary resources, the main of which is whey. Improving the production processes of traditional food products and developing innovative ones is possible only with the use of the latest technologies and technological equipment. Membrane processes are widely used for the use of fractionation and concentration of liquid dairy products, which allows for a new solution to the processing of raw materials and opens up opportunities in the development of new types of food products. The article is devoted to the issue of production and processing of whey in Kazakhstan. The main types of membrane technologies and the advantages of their use in the dairy industry in the Republic of Kazakhstan are considered. The role of membrane technologies in the processing of whey is substantiated, various methods of introducing membrane processing methods to ensure the demineralization of whey, obtaining products with high biological value and consumer properties, reducing the cost of energy carriers, reducing the volume of raw materials in order to save transport costs, non-waste processing of milk solids, recycling water are described. This article analyzes the problems of using resource-saving membrane technologies in the production of dairy products in the Republic of Kazakhstan, ways to solve existing problems associated with increasing the economic efficiency of enterprises. The favorable impact of the use of membrane technologies on the social and environmental aspects of whey processing in the country is substantiated.

Year of release: 2022
Number of the journal: 4(88)

Mathematical modeling of experimental data in the design of formulas for dairy products
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Main problem: the article is devoted to the issue of designing basic recipes for dairy products using mathematical modeling methods. The author analyzed the problems in the field of food technology and concluded that mathematical modeling is used in the following areas: clarification of technological process modes, designing recipes and assessing the quality of finished products, as well as predicting the shelf life of new products when they are put into production. The use of dihydroquercetin as a drug that prevents the oxidation of milk fat in the design of dairy products is substantiated. Mathematical modeling was carried out on the basis of experimental and analytical material obtained in laboratory and production conditions. Based on the maximum value of the objective functions, the optimal normalized mixtures and the maximum allowable concentration of dihydroquercetin were selected. The analysis of the received mathematical dependences and models is carried out, the system of linear equations is made. Purpose: to study the effect of natural bioflavonoid antioxidant on the oxidative processes of milk fat and the viability of lactic acid cultures and their associations by mathematical modeling in order to use it in the technology of a new product; conduct an analysis of mathematical dependencies and models, compose a system of linear equations. Methods: the article uses the method of mathematical analysis and the matrix method. Results and their significance: a mathematical model was developed for the dependence of the viability of probiotic cultures on the mass fraction of dihydroquercetin when designing recipes for a creamy-protein curd product, a matrix of the chemical composition of dairy ingredients was presented, and a system of linear equations for basic recipes was compiled. In the course of the study, the spatial configurations of dihydroquercetin, as well as its effect on the oxidative processes of milk fat, were studied. Mathematical modeling of experimental data on the study of the effect of dihydroquercetin on the viability of microorganisms with probiotic properties was carried out. The normalization of the complex of obtained results on the study of the influence of the mass fraction of dihydroquercetin on the fermentation process was studied. Controlled factors characterizing the process of fermentation of model media with dihydroquercetin have been determined. A rationing of the dihydroquercetin complex of more than 0.50% was established; the target function decreases to its minimum value of 0.53 with a mass fraction of dihydroquercetin of 1.00%.

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Fermented milk and vegetable "Products for live"
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In the dairy market of Kazakhstan, the demand for mass-produced dairy products is decreasing and expanding to innovative fermented milk products for functional nutrition. The main feature of the new technology is multicomponent formulations, which include the main raw materials and biocorrectors, ensuring their high biological and nutritional value. New dessert products are prepared on a dairy or protein basis using vegetable ingredients, fermented with strains of dry starter cultures of direct application or immobilized starter culture Bifimm probio. The purpose is to apply immobilized living cells of pure cultures of lacto- and bifidobacteria as a biocatalyst for the fermentation of dairy-vegetable media. During the study, the method of immobilization of microbial cells in biopolymer gels was used. The most effective method is the inclusion of cells in an aqueous solution of biopolymers with a concentration of 25 %. For immobilization, pure cultures of lactic acid and bifidobacteria were selected in the gel as part of the concentrates "BK-Altai-LS Bifi", "Poleznaya Partiya", "Genesis", "Narine", "Bio-yogurt Vivo", and the main prescription ingredients were selected: milk with a mass fraction of fat of 1 %, 2.5 %, 3.2 %, natural grain additives, jams, juices, nuts. Formulations, technological schemes and production methods, prototypes were developed, quality and safety indicators were determined. Studies have shown the effectiveness of immobilized starter cultures in the formation of fermented dessert products. Out of 20 prototypes with the best indicators, 5 samples were selected, in which the optimal ratio of milk, probio Bifimm starter cultures and biocorrectors averaged 70:20:10. The quality and safety analysis showed that new fermented milk products using immobilized starter cultures have a positive effect of more than -70 % compared to direct-use starter cultures, have functional properties and can be used for healthy nutrition in Kazakhstan.

Author: T.A. Nazarenko
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