bluuebunny/crossref_metadata_2025 huggingface dataset:
Shaped jelly marmalade with cranberry concentrate
Authors: Alekseenko E V , Chernykh V Ya , Bakumenko O E
Published: February 2021

The use of fruit raw material and its processing products in production technologies of marmalade products is a promising direction in the correction of nutritional value and consumer properties. Hence, cranberries, which are a recognized source of healthy, biologically active and minor food components, as well as natural colors, preservatives and antioxidants, present a particular interest. The paper presents the results of the study on the use of cranberry ingredient in the form of juice concentrate in the preparation of pectin-based jelly marmalade. Cranberry juice concentrate was added in the amount of 6-15% to the weight of white sugar in the marmalade jelly. Marmalade was prepared under laboratory conditions according to a traditional scheme, which includes the preparation of sugar-dextrose syrup with a jelling agent, boiling of marmalade mass, its molding and gelation, extraction of marmalade from molds and white sugar coating. The gelation was carried out at a room temperature of 23°C for 2 hours. It is shown that the use of cranberry juice concentrate in the formulations of marmalade products allows making a product with high organoleptic indicators (appearance, shape, consistency, taste, color, smell). Positive influence of cranberry juice concentrate on structural and mechanical properties of pectin-based marmalade products is revealed, which is demonstrated by the increase of marmalade jelly strength. Taking into account the results of organoleptic analysis and studies of structural and mechanical properties, a formulation of shaped jelly marmalade was developed with addition of cranberry juice concentrate in an amount of 13% to the weight of white sugar in the jelly mass. It was found that shaped jelly marmalade meets the regulatory requirements prescribing its quality and contains biologically active substances and minor components of cranberries.
Study of antioxidant activity of juices and beverages from blue honeysuckle and black chokeberry
Authors: Belyaeva O V , Sergeeva I Yu , Belyaeva E E , Chernobrovkina E V
Published: February 2021

Modern high rate of life and unfavorable environmental situation increase stress, reduce active performance ability and health of the population. A relevant area of research is the search for effective ways to protect the body from oxidative stress, when free radicals destroy vascular walls, oxidize protein molecules, DNA, lipids. Oxidative stress can be reduced by consuming the right amount of antioxidants. The work is devoted to the study of antioxidant activity (AOA) of blue honeysuckle and black chokeberry juices and beverages. It was found that beverages based on fruit raw materials have higher antioxidant activity compared to mass soft drinks. It is shown that AOA of directly squeezed black chokeberry juice makes 9.009±0.061 mmol-eq/l, and blue honeysuckle–7.682±0.015 mmol-eq/l. Beverages based on mineral water with fruit juices have higher AOA compared to those prepared on technologically treated water (1.789±0. 069 and 1.667±0.013 mmol-eq/l respectively for blue honeysuckle and black chokeberry juices and beverages). During 7 days of storage the beverages show a slight decrease in AOA, on average ranging from 3.5 to 7.5%.
Marshmallow technology of increased nutritional value
Authors: Ivanova N G , Nikitin I A , Klokonos M V , Berezina N A , Bulavina T A , Guseva D A
Published: February 2021

Dietary fiber is an essential component for the intestinal microflora. The state of the intestinal microflora is important for the human body, and is also necessary for reducing allergenicity and improving general well-being. Insufficient consumption of prebiotic components leads to a number of pathological conditions, ranging from intestinal disorders to intoxication of the entire body. Today, the market offers a wide range of confectionery products, the consumption of which is an integral part of the human diet, but they are characterized by low nutritional and high energy value. Improving the technology of confectionery products by introducing functional ingredients into the recipe, which improves the state of the intestinal microbiota, will allow a scientifically sound approach to solving the problem of the lack of bifidogenic confectionery products, improving their range and ensuring wide consumption in everyday life. The paper presents the results of research on the development of marshmallow technology of increased nutritional value. It is justified to replace part of the recipe amount of sugar with Jerusalem artichoke syrup as a source of inulin and milk whey used instead of organic acids and sodium lactate. To expand the prebiotic components, part of the Apple puree is replaced with a puree of black currant, blueberry and strawberry berries. The presented range of marshmallows is characterized by a reduced energy value, low sugar content, enriched with dietary fibers, B and C vitamins, potassium, calcium and iron. The storage capacity of the developed marshmallow was investigated, which showed a longer preservation of freshness due to the presence of whey in the formulation, which serves as a moisture-retaining component.
Research of surface-active properties and sizes of pectin molecules after post-alcohol grain distillery dreg
Authors: Kaishev A S , Kaisheva N S , Gyulbyakova H N , Maslovskaya E A , Karpenko V A
Published: February 2021

From the multicomponent composition of biologically active substances contained in wheat post-alcohol grain distillery dreg, the leading role in the manifestation of surface-active properties is presumably played by pectins. Therefore, the purpose of the work was to isolate pectins from the distillery dreg, study their surface-active properties and determine the size of molecules in the saturated adsorption layer to justify the possibility of using pectins in pharmaceutical practice as auxiliary substances. The physical and chemical characteristics of pectins isolated by the technology of complex processing of distillery dreg were studied: pH of 0.5% aqueous solution (4.25), average molar mass (1650•10-3 kg/mol), degree of polymerization (10), binding capacity to lead (II) ions (282.29 mg/g of pectin). According to a series of pectin solutions with a concentration of 0.5-6.1 mol/m3 the following parameters were determined and calculated experimentally at a temperature of 293 K: surface tension (51.96•10-3-67,55•10-3 N/m), surface activity (7.54), marginal surface excess (6.25•10-5 mol/m2), critical micelle formation concentration (1.48 mol/m3 or 0.24%). The found characteristics of the surface properties of the calculated size of the pectin molecule in a saturated adsorption layer: cross-sectional area (2,658 Å2), weight of pectin per unit area (1,031•10-4 kg/m2), the length of the molecule (1026 Å), the volume of the molecule (Å3 2727), the radius of the cross section of the molecule (0,920 Å), the cross-sectional diameter of the molecule (1,840 Å). The calculated size of the pectin molecule from distillery dreg in a saturated adsorption layer, comparable to the parameters of analogues (beet pectin, polygalacturonic acid, sodium alginate), indicate the biological availability of the tested pectins and creates the prospect of their pharmaceutical use in drug technology.
Scientific and practical aspects of trehalose contain in ice cream without sucrose
Authors: Tvorogova A A , Landikhovskaya A V , Kazakova N V , Zakirova R R , Pivtsaeva M M
Published: February 2021

The article presents the results of studies on the creation of a composition, the determination of quality indicators of low fat ice cream without sucrose. The research is determined by the population’s need for healthy food and conducted with the help of modern rheological, microstructural and thermostatic research methods. To replace the traditionally used sucrose, a mixture of trehalose and fructose is provided. This provided the sweetness and dry substances characteristic of milk ice cream with a sucrose mass fraction of 15.5%. It has been established that the use of fructose and trehalose instead of sucrose does not adversely affect technologically significant product parameters. Their use leads to an increase in the effective viscosity of the mixture by 1.2 times, does not reduce the thermal stability of the finished product and increases the dispersion of ice crystals. Ice crystals with trehalose were dominated by ice crystals up to 15 microns in size after quenching. An increase in their size to 22 microns after 1 month. storage did not adversely affect the organoleptic characteristics of the product. In the control sample, ice crystals prevailing at least 35 microns in size during this period.
Some aspects of the influence of the chemical composition of gel-forming raw materials on the properties of marmalade
Authors: Kondratiev N B , Kazantsev E V , Osipov M V , Petrova N A , Svyatoslavova I M
Published: February 2021

This work is aimed at solving the problems of controlling the structural-mechanical, rheological, organoleptic properties of jelly-like confectionery by changing the chemical composition of gel-forming raw materials. The manufacture of jelly marmalade is a complex process owing to the presence of a large number of prescription components that affect the properties of finished products such as sugar, molasses, pectin, modified starch and other structure-forming agents. Since pectin is produced in Russia in small volumes, this limits the possibility of choosing its type due to the high price, which does not always guarantee the stability of the quality of marmalade during storage. Pectin derived from major sources (apple cake, citrus crusts, sugar beet, etc.) differs in chemical properties and molecular chain size. The influence of the composition of carbohydrates on the structural, mechanical and rheological properties has not been adequately studied. Since moisture transfer processes have a significant effect on the shelf life of intermediate moisture products, which include marmalade, it is the chemical composition of the raw material that causes the ratio of bound to free moisture in the marmalade. In the paper the influence of the content of starch syrup (5.0 - 25.0%) on the structural-mechanical (strength) and organoleptic characteristics of model samples of jelly marmalade made on the basis of apple pectin is considered. The obtained patterns can be used to predict the stored capabilities and shelf life of various marmalade items.
The study of persistence of microorganisms and parasites in food products
Authors: Lyashchuk Yu O , Novak A I , Kostrova Yu B , Shibarshina O Yu , Evdokimova O V , Kanina I V
Published: February 2021

Safety of food products is assessed by hygiene standards, which include biological, chemical and physical risk factors. Biological risk factors include viruses, bacteria, mold and yeast fungi, protozoa, helminths and their toxins. Their presence in food products is either completely unacceptable, or should not exceed the acceptable ranges of concentrations in a certain volume of the test products. The original scoring technique was used for a quantitative assessment of biological risks. The persistence of microorganisms and helminthes was evaluated in meat, dairy and vegetable products, culinary products, eggs, canned food, pickles and marinades. Among the studied biological risk factors, the following have very low persistence in food products: adolescari of Fasciola spp.; eggs of Trichocephalus trichiuris, Enterobius vermicularis, Hymenolepis nana, Echinococcus spp., Ascaris lumbricoides, Strongyloides stercoralis larvae, cysts of Lamblia intestinalis, Entamoeba histolytica. Low persistence was demonstrated by Rotavirus, hepatitis A virus, the genus Norovirus, bacteria of the Leptospira spp. and Vibrio spp., Escherichia coli, Toxoplasma gondii and Cryptosporidium parvum. Medium persistence was demonstrated by plerocercoids of Diphyllobothrium spp, cysticercuses of Taeniarhynchus saginatus and Taenia solium, bacteria Shigella spp. and Francisella tularensis. High persistence was shown by larvae of the genus Trichinella, metacercaria Opisthorchidae, bacteria Mycobacterium spp., Proteus spp., Campylobacter spp., Yersinia spp., Brucella spp., Bacillus cereus, Clostridium perfringens, Staphylococcus aureus and Clostridium botulinum. Aphthovirus, Salmonella spp. and Listeria monocytogenes have very high persistence.
Formulation development and production technology of innovative specialized food product under conditions of agriculture digitization
Authors: Tokhiriyon B , Poznyakovsky V M , Andrievskikh S S
Published: February 2021

The article deals with scientifically based specialized food product formulation under conditions of agriculture digitization. It characterizes the formulation components and their synergetic properties in terms of prolonged anti-oxidant body protection. The authors have developed a new skeleton method of innovative food product pelleting, which ensures its long shelf life and its functional components efficacy. The innovative production technology of new pellet-filled capsules allows programmed release of active substances from a tablet skeleton at specific time and in specific order. It also eliminates oxygen exposure, which, along with low moisture content, prevents oxidative and hydrolytic processes. This technology as well as favorable production parameters provides high usability properties of the product and stability of its biologically active ingredients. The authors determined the product nutrition value, which characterizes the product functional properties. These functional properties are confirmed by field studies. Development of a new specialized product formula and its production technology under conditions of agriculture digitization result in a wider range of functional products, a safer, more effective and useful high quality product, intake of which prevents alimentary diseases development and improves both overall health and working capacity. It is important to note that the new product is certified in accordance with the requirements of international standards of the ISO 9001: 2000 series and GMP rules. It also has a sanitary-epidemiological certificate and is included in the Federal BAA (biologically active additives) List. The developed innovative technology has been tested by the enterprises of the company “Artlife” (Tomsk), which ensures its competitiveness and quality stability.
The results of evaluating the use of vegetable additives in bread production
Authors: Zavalishina O M , Kuznetsova T A , Korneeva A V
Published: February 2021

The results of research on the influence of potato, carrot, and pumpkin additives in the dough in the production of bakery products are presented. It has been found out that the vegetable components introduced into bread making have a positive effect on the quality of finished products, improving their organoleptic and nutritional properties. It has been discovered that the addition of vegetable purees in an amount of 5 to 25 % significantly improves the quality of raw gluten flour with reduced baking properties. The introduction of natural additives in products not only improves the quality characteristics of products, but also allows expanding the range of products for healthy eating.
Promising innovative technologies and equipment in the university food system
Authors: Belyaeva M A , Gajour A A , Kechkin I A , Kirpichnikov V P , Eremin A E
Published: February 2021

The food systems of the Plekhanov Russian Economic University studied in detail. For comparison, studies on the other six leading universities in Moscow and data on many large foreign universities are presented. The demand for healthy nutrition in most universities and the development of a customer services network in them has been established. These problems are especially acute in the field of human nutrition, namely in the university nutrition system. Therefore, the authors studied the market situation with the demand for food services in universities (Russian and foreign). Surveys, questioning of a youth audience were carried out in order to ascertain the quality of culinary dishes and products, the level of service, assortment, methods of selling food and culinary products. In terms of improving the nutritional system of universities, it seems the best option for using vending sales, pizza and other innovations. However, problems were identified in the service of vending machines. Therefore, their most rational placement is necessary. Besides, it is necessary to form the required range of products and the related tasks of portioning, packaging, and logistics.
Research of consumer properties of butter cookies composed of non-traditional raw materials
Authors: Sokol N V , Sanzharovskaya N S , Romanova N N , Khrapko O P
Published: February 2021

This paper examines the influence of non-traditional raw materials of plant origin on the formation of consumer properties of functional butter cookies. It considers the biological value and balance of wheat and spelt flour. It scientifically proves that the lysine content (the most deficient essential amino acid) is significantly higher in spelt flour than in wheat flour. The analysis of organoleptic and physicochemical properties provided a basis for determination and scientific substantiation of the composition of butter cookies. It is found that it is technologically possible to use 40% of spelt flour of the total flour weight and 4% of barley malt extract. This dosage ensures high consumer properties of the products. It was proved that cookies with spelt flour and barley malt extract have higher quality characteristics during the entire shelf-life, as compared to the control samples. It was found that new potentially healthy ingredients of plant origin can enrich butter cookies with minerals, protein and some essential amino acids, enhancing the nutritional and biological value of the finished products. The results obtained in this paper have practical significance for improving the biscuit baking technology, namely, for enhancing its nutritional and biological value.
Formation of agrocenosis camelina sylvestris in the conditions of Black Sea region
Authors: Pashtetskiy V S , Turina E L , Turin E N , Cherkashyna A V , Rostova Y N
Published: February 2021

Winter Camelina (Camelina sylvestris) is an oilseed crop of the Brassicaceae family, the oil of which is used in various industries. Sowing dates and sowing rates have a significant impact on the productivity of camelina in the arid conditions of Black Sea region. The purpose of this study was to determine the effect of sowing dates and sowing rates on the duration of the growing season, field germination, winter hardiness and yield structure in Black Sea region. The agroclimatic resources of Black Sea region allow the successful introduction of winter camelina, which is distinguished by their broad agroecological resistance to biotic and abiotic stress factors. The Penzyak variety of winter camelina is well adapted in the zone and is able to form a satisfactory yield in a wide calendar range. By correcting certain technology elements taking into account meteorological conditions, it is possible to create prerequisites for a more complete realization of the potential productivity of culture. The length of the growing season of camelina in the Black Sea region is from 179 to 269 days, depending on the sowing period and weather conditions. The winter hardiness of winter camelina in the Black Sea region depends on the sowing period: when sowing on September 15 and 30 and on October 15 it is high and reaches 92-100%. The winter hardiness of the late sowing season depends on the prevailing weather conditions in the winter: in some years it can be high (98–99%), but in the years when bulging and blowing of plants by the wind is manifested, it decreases to 44–49% when sowing on October 30, and to 20% when sowing on November 15.
Alternative sources of aquaculture feed in the context of organic production priorities
Authors: Isyakaeva R R , Lagutkina L Yu , Akhmedzhanova A B , Golubkina E V , Kaplanov M T , Khazova N A
Published: February 2021

The article presents data on alternative feed sources composition for thermophilic freshwater crustaceans and cyprinids. We found that the implementation of an agriculture component in the feed is quite capable of replacing the regular parts. Studies have shown that the addition of new elements allows modifying the previously used feed with a positive effect on the potential growth rate of cultivated thermophilic objects. The presented food additives from local, raw materials not only correspond to the food preferences of the cultivated objects but also reduce the cost of feed, thereby increasing its competitiveness in the aquaculture feed market. Based on the detailed study of nutritional characteristics of alternative sources of feed raw materials, effective doses of the compounds have been developed. A partial replacement of scarce fish meal was made with the useful addition of local raw materials- an alternative component of the source of protein from pond ecosystems - 50%, which provides a high growth rate of cultivated objects. A consistent rejection of antibiotics dictated the conditions for the study of the addition of the probiotics of into feed (0.3% -0.5 %) that increase the body’s resistance under farm conditions and 100% survival during cultivation. The proposed alternative is the taste addition of a local halophyte plant - 0.1% increase feeding attractiveness, active and united response to the recommended feed, which reduce its conversion. Replacement with alternative sources of feed was made under the basic requirements of organic production of aquaculture products.
Treatment of waste water from a winery with an advanced oxidation process (AOP)
Authors: Ippolito N M , Zueva S B , Ferella F , Corradini V , Baturina E V , Vegliò F
Published: February 2021

Producing wine entails the consumption of large quantities of fresh water, and consequently the production of large quantities of wastewater the treatability of which becomes increasingly difficult as purification standards get stringent, year after year. The problem is in the presence of aldehydes, phenolic compounds and detergents which are not easily broken down by the microorganisms of ordinary biological treatment. Wastewaters from wineries command high levels of Chemical Oxygen Demand (COD). In recent years research has focused on using Advanced Oxidation Processes (AOPs) as a means to abate the concentration of organic compounds and polluting contaminants, to render the wastewater suitable for ensuing biological treatment. The object of this study was to investigate how effective a particular type of AOP, the Fenton’s reaction, could be as a pre-treatment step aimed at destroying the toxic and biologically stable organic contaminants to reduce the organic load on the ensuing biological treatment of the wastewater. In particular, our experiments showed that if oxidation with Fenton’s reagents was followed by neutralization with lime and precipitation with bentonite, the COD reduction could be as high as 54%. Experimental tests were designed according to a 23 full factorial plan. Elaboration of results led to a model of COD reduction as a function of two significant factors. Finally, the flowsheet and the mass balance of the proposed process were defined.
The ionic composition of distilled beverages and its effect on their stability during storage
Authors: Abramova I M , Medrish M E , Savelieva V B , Romanova A G , Gavrilova D A , Zhirova V V
Published: February 2021

During prolonged storage of distilled beverages, turbidity may form in them, which leads to the loss of their presentation, so one of the main problems of the distillery is the increased stability of a finished product during storage and increasing shelf life of products. Identifying the causes of turbidity and precipitation is one of the most important and urgent tasks in the control of alcoholic beverages. In this work, industrial samples of alcoholic beverages containing inclusions, turbidity and precipitation were investigated using the method of ion chromatography. The ionic composition of the studied samples is represented mainly by cations of sodium, potassium, calcium and magnesium and anions of fluorides, chlorides, nitrates, phosphates and sulfates. Mass concentrations of the ions represented fluctuate over a wide range, which is explained by the rich microelement composition of plant components, the specifics of the formulations and the peculiarity of water treatment from different manufacturers. The analysis of results showed that one of the main reasons for the appearance of turbidity and precipitation in distilled beverages is the increased content of calcium and magnesium ions.
Study of the strength of granules of instant drinks in a drum vibrating unit
Authors: Popov A M , Plotnikov K B , Ivanov P P , Donya D V , Plotnikov I B , Beryazeva L N
Published: February 2021

In conditions of high employment, the question of proper and balanced nutrition is becoming more and more acute, since it is not always possible to get all the substances necessary for the body with food. In this regard, the development of functional instantiated products is an urgent task. The paper investigates the new design of a drum vibrating unit, namely, determining the strength of the obtained granules depending on the design and operating parameters of the process. The object of research was instantiated jelly in the form of granules with dimensions of 1–3 mm. Another task was to determine the effect of mechanical activation of potato starch on the strength of the resulting granules. From the analysis of the obtained data, it can be concluded that the greatest influence on the strength of the granules is exerted by the dynamic component, namely, the frequency and amplitude of vibrations, and the rotation frequency of the kneading unit does not have a significant impact, but directly affects the time when the product is in the drum unit. Analysis of the effects of mechanical activation of potato starch showed that granules obtained based on native potato starch have less static crushing strength. This is because during the mechanical activation of starch agglomeration centres are formed, which ultimately leads to an increase in strength.
Ways to improve the efficiency of regulation of biomass concentration using modern control systems
Authors: Avtsinov I A , Gavrilov A N , Sukhanova N V , Kozhevnikov Yu E , Nickel S A , YuMalikov D
Published: February 2021

The paper presents an option for solving the task of controlling the process of growing yeast in order to bring their concentration X closer to the desired one by deliberately changing the parameters of the process conditions within acceptable limits. The relationships between the main parameters of the process of cultivation of microorganisms are revealed. It is shown that these relationships are of a complex cross character, and the control object is multidimensional. Based on the analysis of the interaction of the main parameters, a diagram of their relationship is drawn up. At optimal values of the parameters of the process conditions, the change in yeast concentration is far from the required. It is proposed to change the parameters of the process conditions in accordance with a given value of the concentration of yeast Xgiv, which can be determined with constant periodicity during the cultivation process. To solve assigned task, the principle of cascade control of yeast concentration X is used, where the internal contour includes the systems of controlling the temperature, acidity, formal value, and respiratory coefficient. The analysis of transients in cascade systems showed that the most effective systemsunder consideration are concentration control systems that use the temperature and the acidity of the medium control in the internal circuits.
Increase of durability of cutting elements in forage equipment using electric spark alloying
Authors: Akenchenko M A , Davydov O Yu , Kvashnin B N , Litvinov E V , Lihacheva L B
Published: February 2021

Features of interaction between the contact surfaces of cutting elements and ground raw materials used for forage preparation determine ways to increase the wear resistance of these elements, which are based on the formation of layers on their working surfaces with physical and mechanical properties and relief corresponding to these features. Because the conditions in the contact zone are variable, selective local application of electrophysical reinforcing coatings can ensure equal strength of different working surfaces or create conditions for self-sharpening of cutting edges and thereby increase their wear resistance. Electric spark alloying is a micro-welding process that uses short-term electrical pulses of high current to deposit the electrode material on a underlay of any electrically conductive metal material. The method of electric spark alloying is based on the phenomenon of metals and alloys erosion under the influence of electric current. The main disadvantage of electric spark alloying is the high roughness of the hardened surface after processing. Received wear-resistant layer should maintain as much thickness as possible and avoid further mechanical treatment of the surface that increase the durability of the restored part and reduce the total cost of work on reinforcement.
Study of energy consumption when mixing bulk materials in a centrifugal-blade mixer
Authors: Ratnikov S A , Borodulin D M , Sukhorukov D V , Cherkashina D K
Published: February 2021

The results of a study of the flowability of finely divided dry materials and mixtures depending on the diameter of the particles and their density are presented, the influence of the mechanical effect and the physicomechanical properties of the materials on the flowability are determined. A mathematical model is constructed that allows one to functionally evaluate the dependence of flowability on the physicomechanical characteristics of the material under study by the method of multiple regression analysis. Polynomial equations are obtained that describe the influence of the flow area, physical and mechanical properties on the flowability of various materials and mixtures. A flowability criterion is proposed that describes the motion of various materials under the action of inertia forces. Partial and universal criteria equations are obtained that describe the energy expenditures for mixing bulk materials
Fe3O4@PDA Immobilized glycerine dehydrogenase
Authors: Xing Zhaoliang , Dai Xiying , Wu Pengfei , Zhang Chong , Li Fei , Xiao Yu , Li Jian , Han Lin
Published: February 2021

Synthesis of surface modified/magnetic nanoparticles has become a vital research area of material science. In the present work, iron oxide (Fe3O4) nanoparticles prepared by solvo-thermal method were functionalized by polydopamine, which was as a facile nanoplatform for immobilizing glycerine dehydrogenase (GDH). The obtained nanocatalyst enabled efficient glycerol dehydrogenation reaction. The results show that GDH immobilized on polydopamine coated iron oxide (Fe3O4@PDA@GDH) revealed better adoptability towards higher levels of pH comparative. Moreover, this biocatalyst can be easily recovered from the reaction system without centrifugation or filtration.
Analysis of Smart Grid Stability and Security Management Based on Data Mining
Authors: Zhang Chao , Yuan Zhihang , Yan Pei
Published: February 2021

In the process of the operation and construction of the smart grid, the development of science and technology and the improvement of social productive forces have put forward higher requirements for the development of the power system. In this process, the scale and form of the power system have also changed to a certain extent, and power security has also become the most concerned issue. In the information society, through the application of the Internet of things and big data technology in power security management and control. It can simplify the operation process of the staff and reduce the occurrence of accidents. Distributed smart grid is a new technology proposed for power networks with elastic nodes, which can realize dynamic electricity price demand response without large-scale transformation of infrastructure. In order to analyze the system stability of DSG, six representative machine learning classification models are applied to analyze the stability data of 10000 samples of 4-node system. Combined with the requirements of power system security, stability and economy, the effect of each classification model on the prediction of DSG system stability is tested.
Active Distribution Network Fault Recovery Based on Particle Swarm Optimization
Authors: Jiao Deqiang , Wan Lin , Wang Dinghao
Published: February 2021

As a new mode of distribution network, it is necessary to study the minimum loss of active distribution network after line failure. Therefore, this paper proposes a method of active distribution network fault recovery based on particle swarm optimization (PSO). On the premise of satisfying the constraints of distribution network, this algorithm establishes an objective function model of balancing load based on reducing network loss. Using the active distribution network system of IEEE 33 node, the experimental simulation proves that the particle group algorithm can effectively solve the problem of active distribution network fault reconstruction by contrasting the particle group and ant group algorithm, and has the advantages of good stability and high efficiency.
Design of high-rise garbage sorting and conveying system based on gravity power generation system
Authors: Wang Shuai , Yang Zi’yu
Published: February 2021

With the rapid development of society and the improvement of people’s living standards, more and more people live in high-rise buildings, and while their living conditions are improving, they are also facing a lot of cleaning problems of domestic garbage. Among them, the disposal of domestic waste is one of the biggest problems faced by high-level users in their home lives. At present, the existing facilities are to build vertical garbage channels and set up garbage bins on each floor, but its convenience is far lower than the negative impact brought about, so a new type of garbage conveying system is necessary.
Harmonic analysis of AC/DC hybrid microgrid
Authors: Jiao Deqiang , Liu Che , Wang Dinghao , Li Zerui
Published: February 2021

A large number of nonlinear components exist in AC/DC hybrid microgrid, which will cause harmonic pollution and affect power quality. In this paper, according to the diversity, complexity, nonlinear and mutation characteristics of harmonics, the harmonic analysis of AC/DC hybrid microgrid is carried out by adding harmonic sources. The model diagram of AC/DC hybrid microgrid is built, and the mathematical parameters of harmonics are introduced. Finally, the simulation of microgrid model is constructed based on ETAP, and the harmonic characteristics of AC/DC hybrid microgrid are studied in three cases of static load and equivalent grid using the same harmonic source.
Design and Research of Plug-in Strip for Field Verification of Electric Energy Meter
Authors: Yin Wei , Tang Shengfei , Zhu Weijie , Chen Jin , Xie Jianguo , Sun Guodong , Xu Qin
Published: February 2021

Design a special plug-in strip for on-site verification of electric energy meters, combined with a dedicated wiring backplane for non-stop meter replacement, to achieve non-stop meter replacement. On the basis of meeting the on-site verification work, design the special plug-in strip for verification, complete the selection of the materials of the special plug-in strip for verification, upgrade and improve the special plug strip for on-site verification of electric energy meters according to the requirements of safety, functionality, and durability. And open the mold trial production verification special plug-in sample. The special plug-in strip design for on-site verification of electric energy meters lays the foundation for realizing the replacement of electric meters without inductive power failure.
Evaluation of the effect of various types of tools on a weld joint during wave strain hardening
Authors: Kirichek A V , Barinov S V , Yashin A V , Ryzhkova M N , Konstantinov A M , Zaitsev A A
Published: February 2021

The article studies the problem of increasing the durability of weld joints using surface plastic deformation by the method of wave strain hardening (WSH). Earlier, WSH was not used for these purposes. The prospect of using WSH for increasing the durability of weld joints is associated with the possibility of increasing the microhardness and the formation of compressive residual stresses at a depth of more than 10 mm. To identify the most effective conditions for the use of various types of tools for WSH of weld joints and accelerate the search for rational modes and conditions of WSH, finite element modeling was used. As a result of the research, recommendations related to the use of various types of WSH tools, depending on the thickness of weld joints, changes in hardness and stress state of the near-weld zone after welding, were given.
Prospects for power supply infrastructure enhancement
Authors: Gavrikova E V , Gorgisheli M V , Kosygina A V , Volkova I O , Yakovleva A Y , Dolmatov I A , Suslov K V
Published: February 2021

Traditional retail electricity market models transform under the condition of new technologies development and institutional changes in countries and worldwide. New models of the retail electricity market need to be adopted to recent requirements made by different stakeholders. The purpose of this study is to advance the understanding of transformation of the electricity retail market in different countries through introducing a uniform framework for comparison. The findings provide insights for experts and authorities on how the changes in the dynamic environment led to the emergence of new market models in six surveyed countries. Specific features of different models are highlighted to ensure optimal working conditions and incorporation with managerial practices in the industry as well as to help policy makers to understand what additional measures may boost the competition in retail electricity markets.
Interaction algorithm of the mechanisms of relative manipulation in a 6-DOF robot control system
Authors: Khalapyan S Y , Rybak L A , Gaponenko E V , Kholoshevskaya L R
Published: February 2021

The paper considers the features of management of a 6-DOF robot, developed on the basis of two interacting mechanisms of a parallel structure. Each mechanism provides movement in three independent degrees of freedom: a flat 3-RPR mechanism for installing a part and a 3-RPS mechanism (tripod) for installing a tool. It is shown that when these mechanisms are jointly controlled, it becomes necessary to correct the movement of one of them in connection with the parasitic movements of the other. The authors propose the method for the description of the position of the movable platform of the tripod, which allows using only five output coordinates. According to the authors, the platform rotation representation used in this case is more convenient to describe the interaction of mechanisms than the traditional use of Tait – Bryan angles. The algorithm was developed to correct the task by the position of the planar mechanism in order to compensate parasitic movements of the movable platform of the tripod in the horizontal plane during the control of a 6-DOF robot. On the basis of a specially constructed 6-DOF robot model with mechanisms of relative manipulation, the simulation in the MATLAB package was carried out, which confirmed the effectiveness of the proposed algorithm.
Standardization and control of thread parameters of a roller-screw gear
Authors: Zavyalov V S , Fedosovsky M E , Maltseva N K , Degtyarev V V , Boldyrev I P , Sharshov A G
Published: February 2021

Among the mechanisms that transform rotational motion into translational motion, helical gears of rolling, which provide higher efficiency and speed, are currently dominant. These include ball-screw gears and roller-screw gears. A comparative analysis of these showed that the latter has a number of limitations compared to the former. Serial production requires the development of automated technologies for machining, assembly and testing, the use of high-precision metrological equipment to control functional surfaces with minimal time costs in digital automated systems. Modern measuring instruments, such as contour meters allow for element-by-element control of the parameters of threaded surfaces. In the manufacture of high-tech products such as an electromechanical drive, the use of element-wise control is the only way to ensure product quality. However, not enough standardization of the parameters of the thread of the roller-screw gears requires the development of a set of requirements that provide the specified operational characteristics of the product. The work is devoted to the standardization of the parameters of the special roller-screw gears thread used in the electromechanical drive manufactured by AO Diakont. This article discusses issues related to the standardization of the accuracy parameters of the profiles of high-precision roller-screw gears, metrological support tools, a set of techniques and software based on a systematic approach to inputting, outputting and transmitting information about measurement results and evaluating their validity. The application of the proposed control methodology allowed improving the quality of products and reducing its cost.
Recognition of structural elements of mechanical engineering as a solution to data formalization problem
Authors: Fokin I V , Podrez N V , Smirnov A N , Govorkov A S
Published: February 2021

The paper discusses a typical example of recognizing a sheet metal part containing 2 structural elements. According to the developed recognition algorithm, a software module was implemented for automated recognition of structural elements in a 3-dimensional model of parts with the * .stp extension, which allowed working not only with models made in the Siemens NX system, but also, in general, with almost any 3D models exported in this format. The result of recognition can be used to develop systems that design technological processes for the production of mechanical engineering products, including at aircraft production enterprises.
Geological, technological and technical justification for choosing a design solution for drilling wells under different geological conditions
Authors: Mukhametshin V G , Dubinskiy G S , Andreev V E , Mukhametshin V V , Kuleshova L S
Published: February 2021

The oil companies focus on the prevention of leakage of the producing well to ensure the long-term well viability. The article considers the rationale for preventive measures to reduce the risks to the integrity of the strings and ensure the operation of the wells for the duration of their use. The authors propose tools for analysing the condition of wells as well as technical and technological solutions for extending the operation of the well without damage.
Modeling the production of hard-to-recover oil reserves using thermal methods
Authors: Gizzatullina A A , Minnivaleev T N , Mingulov I Sh
Published: February 2021

This article presents the theoretical and numerical implementation of the possibility of heating a reservoir with hard-to-recover oil. In a radial one-dimensional formulation, the article proposes a solution to the problem of hard-to-recover oil filtration with an increased viscosity coefficient. The procedure is performed in a reservoir using the thermal method of exposure in a single horizontal channel. Hot steam or water flows are used as a heat carrier. Only one channel is used as a heated and production well, which operates alternately.
Using the method of canonical discriminant functions for a qualitative assessment of the response degree of producing wells to water injection during the development of carbonate deposits
Authors: Mukhametshin V V , Kuleshova L S
Published: February 2021

The article proposes an algorithm for qualitative assessment of the response degree of producing wells to water injection into wells for the conditions of oil deposits of the Tournaisian stage of the Volga-Ural oil and gas province, based on the use of the method of canonical discriminant functions (CDF). The obtained CDF equations and distributions make it possible to quickly solve the issues of assessing success of a particular waterflooding system, select wells for transferring them to injection, evaluate the density of the grid of production and injection wells, pressure and volumes of water injection at the stage of drawing up the first design documents.
Mathematical model of propagation of liquid vibrations in a tubing string
Authors: Zaripova L M
Published: February 2021

Effectiveness of wave processes in tubing strings, wells and long pipelines may be limited by damping of hydrodynamic waves along the length of the channel. Violation of thermodynamic equilibrium in reservoir fluids during their rise to the surface and in ground pipelines may be accompanied by the release of asphalt-resin-paraffin components in the flow of crystals due to a decrease in temperature and pressure. Subsequent depositing of crystals takes place as they grow, due to adhesion to the wall of pipes, the surface of equipment. Deposits are most intensified in areas of local expansion and narrowing of the cross-section area of the flow (occurrence of vortices).
Electrospun nanofibrous scaffolds of ε-polycaprolactone containing graphene oxide and encapsulated with magnetite nanoparticles for wound healing utilizations
Authors: Al-Ahmed Zehbah Ali , Al Jahdaly Badreah A , Radwan Hyam A , Hassana Abeer A , Almahri Albandary , Ahmed M K , Taher Mohamed M
Published: February 2021

Wound healing treatment with a nanofibrous matrix is a serious demand to avoid associated complications, including bacterial infections. Magnetite nanoparticles (MNPs) were encapsulated into electrospun nanofibrous scaffolds of ε-polycaprolactone (PCL) containing graphene oxide (GO) nanosheets. The structural and morphological behaviors of the obtained scaffolds were investigated. The modification of nanofibers via the addition of MNPs generated a slight change of morphology, whereas the fibers’ diameters were around 0.2–0.5, 0.1–0.3, 0.1–0.2, and 0.1–0.3 μm for 0.0NPs-GO@PCL, 0.1NPs-GO@PCL, 0.2NPs-GO@PCL, and 0.3NPs-GO@PCL, respectively. Moreover, the roughness average (Ra) increased from 119 nm to be about 169 nm from the lowest and the highest contributions of MNPs. The Human fibroblasts cell line (HFB4) reached around 98.4 ± 3.1% cell viability for 0.2MNPs-GO@PCL composition. The antibacterial activity of the highest contribution of MNPs reached about 11.4 ± 1.6 mm and 12.3 ± 1.2 mm against S. aureus and E. coli, respectively. The in-vitro cells’ attachment of HFB4 showed that cells were adhered to and proliferated through the nanofibrous scaffolds. Cells also spread and grew significantly as the modification via MNPs. Thus, indicating that designing of new scaffold for wound healing and disinfection utilization could be reached via tailoring of electrospun products encapsulating with biocompatible substances such as graphene oxide and magnetite.
InGaAsPBi grown on InP substrate by gas source molecular beam epitaxy
Authors: Tian Fangkun , Ai Likun , Xu Anhuai , Huang Hua , Qi Ming
Published: February 2021

The effects of growth condition on material quality of quinary alloy InGaAsPBi grown by gas source molecular beam epitaxy (GSMBE) were investigated systematically. It is found that 0.1% of Bi incorporation can play the role of surfactant effects and is beneficial to improve the material quality. The roughness of surface RMS measured by atomic force microscope (AFM) is 0.218 nm. Furthermore, the addition of a small amount of bismuth atoms promotes the binding of phosphorus atoms to group III atmos.