DOKLADY NATSIONALNOI AKADEMII NAUK BELARUSI最新文献

{"title":"COMPUTER ANALYSIS OF THE OPERATING CONDITIONS OF THE RADIO CHANNEL OF THE VHF/UHF RANGE TAKING INTO ACCOUNT ZONES OF ELECTROMAGNETIC ACCESSIBILITY OF RADIO EMISSION SOURCES","authors":"V. Maliuk, S. Timchenko","doi":"10.33405/2409-7470/2023/1/41/280885","DOIUrl":"https://doi.org/10.33405/2409-7470/2023/1/41/280885","url":null,"abstract":"The paper considers a technique for computer analysis of the working conditions of a VHF/UHF radio channel, taking into account the zones of electromagnetic accessibility of radio emission sources in relation to a topographic map, depending on the terrain characteristics. Based on the known models of radio signal propagation, mathematical relationships are obtained to determine the boundaries of the electromagnetic accessibility of a radio emission source as part of a mobile radio communication channel on a topographic map of the area. This takes into account the sensitivity of the receiver, the power of the transmitter and the shape of the digitized radiation pattern of its antenna, the scale of the map, and the loss of transmitter power depending on the characteristics of the terrain. On the basis of a modified wave algorithm, a method is proposed for calculating the boundaries of the zone of electromagnetic accessibility of radio facilities of a radio communication channel on a topographic map of the area. The method is characterized by simplicity, high speed and reliability of calculations. Already known techniques for modeling the propagation of a radio signal can be easily integrated into the proposed algorithm. The shape of the electromagnetic accessibility zone is determined by the digitized radiation pattern of the transmitter antenna, obtained using special software. The size of the EMI zone depends on the power and frequency of the radio transmitter, the power loss for signal propagation, and the sensitivity of the radio signal receiver. A technique for computer analysis of the working conditions of the VHF/UHF radio channel has been developed and implemented in the program for the operational support of the operation of mobile radio communications used in tactical levels of command and control of units and subdivisions of law enforcement agencies of Ukraine. Practical examples show the expediency of calculating the electromagnetic availability of radio facilities on a map of the area with a tactical situation in the tasks of assessing the performance of a mobile radio communication channel.","PeriodicalId":41825,"journal":{"name":"DOKLADY NATSIONALNOI AKADEMII NAUK BELARUSI","volume":"30 1","pages":""},"PeriodicalIF":0.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88079855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ESTIMATION OF THE INFLUENCE OF «CONSTRUCTIONAL» FRICTION IN SUSPENSION ON SPATIAL VIBRATIONS OF A VEHICLE","authors":"V. Pisarev, O. Kornev","doi":"10.33405/2409-7470/2023/1/41/280887","DOIUrl":"https://doi.org/10.33405/2409-7470/2023/1/41/280887","url":null,"abstract":"In the process of creating and modernizing ground vehicles for various purposes, in particular armored vehicles, there is a problem of assessing the influence of design features on working processes in operating conditions. These features include the presence of \"structural\" friction, in its manifestations and the effect similar to \"dry\" friction. In some cases, this leads to the appearance of self-oscillations, which is undesirable. Therefore, the development of the theory and practice of numerical assessment of vehicle performance with the possibility of manifestation of self-oscillating properties is an urgent task. Obviously, in the framework of the methodology of applied optimal design of complex technical systems, it is necessary to have an adequate mathematical model of the object of study. An original mathematical model of free spatial vibrations of the sprung part of the transport machine (body) is proposed, which allows one to evaluate the influence of the features of the new vehicle suspension design. The new suspension is hydropneumatic, with a helical gear, with the presence of \"structural\" friction. Calculations carried out numerically using the original program confirmed the correspondence of the mathematical model to modern ideas about the theory and practice of work processes with free vibrations of complex technical systems. The motion parameters during the manifestation of self-oscillating properties and parametric vibrations of an object close in weight and size to the BTR70 and BTR80 are numerically estimated.","PeriodicalId":41825,"journal":{"name":"DOKLADY NATSIONALNOI AKADEMII NAUK BELARUSI","volume":"85 1","pages":""},"PeriodicalIF":0.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84671739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SUBSTANTIATION OF THE COMPOSITION OF DRY RATIONS AND RATIONS FOR SERVICEMEN WITH SPECIAL NEEDS","authors":"L. Tovma, I. Morozov, S. Sukonko","doi":"10.33405/2409-7470/2023/1/41/280867","DOIUrl":"https://doi.org/10.33405/2409-7470/2023/1/41/280867","url":null,"abstract":"An important issue of food supply for servicemen with individual needs is the adjustment of diets through the use of protein, vitamin and mineral food components which are functional ingredients of such food, primarily flour based, products as: bread, bakery and flour confectionery (cookies, crackers, gingerbread), fruit and nut energy bars, and “Granola” breakfast cereals. The priority task is to increase the nutritional and biological value of a daily norm for vegetarians and vegans and to balance it in terms of nutritional composition by creating innovative food products with improved consumer properties which contain such functional ingredients as: proteins, fats, carbohydrates in the optimal ratio, rich in vitamins, antioxidants, macro- and microelements. There is rear opportunity to provide hot food in a timely manner in extreme conditions of combac operations which usually solved by snacks and food which could be carried in a pocket. Hence, the actual for the improvement of quality of food supply for the personnel is:  composition of dry rations and food rations with products that have convenient packaging and high nutritional, biological and energy value;  introducing innovative technologies into the food production process, particularly flour based products;  studying the experience of the armies of NATO member states (their rations include flour products: cookies, muffins, biscuits, crackers, bars, nut and fruit pastes with an extended epiry date and high nutritional and biological value);  use of the innovative raw ingredients with complex effect, which have a wide range of functional and technological properties that contribute to solve such kind of issues in conflict areas;  еxpanding the range of high-quality and socially important food products for Ukrainian military personnel for use in extreme conditions.","PeriodicalId":41825,"journal":{"name":"DOKLADY NATSIONALNOI AKADEMII NAUK BELARUSI","volume":"26 1","pages":""},"PeriodicalIF":0.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73755167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"THE TASK OF SEPARATING OF ITEMS OF CLOTHING AND FOOD SUPPLY IN THE ELEMENTS OF THE COMPLEX OF COMBAT EQUIPMENT OF A SERVICEMAN OF THE NATIONAL GUARD OF UKRAINE","authors":"O. Alboschiy, S. Sukonko, S. Pavlenko","doi":"10.33405/2409-7470/2023/1/41/280855","DOIUrl":"https://doi.org/10.33405/2409-7470/2023/1/41/280855","url":null,"abstract":"The development of the military sphere of activity is ongoing and comprehensive. One of the areas of such development is the equipment of military personnel. Nowadays, much attention is paid to combat equipment in the armies of all countries of the world. According to the Concept for the Creation of a Combat Equipment Complex for the Armed Forces of Ukraine, combat equipment is a set of items that constitute the equipment of a serviceman during combat missions. A combat equipment complex is generally understood to mean the combat equipment of servicemen created to increase the effectiveness of their personal actions in combat (hostilities), as well as as part of a unit in the squad, platoon, company, and battalion. A modern combat equipment complex includes a large number of elements that are interconnected, and their interaction generates properties that are not inherent in its individual elements. Each element of this kit has its own weight, dimensions, and operational features, which together create a load on the serviceman, forming the distribution of mechanical forces and moments on the human body. Consequently, there is a contradiction between the growing capabilities provided by each element of the combat equipment complex for a soldier in combat and the limited physical capabilities of the soldier as a carrier of the equipment and its user. One of the ways to resolve this contradiction is to divide the elements of the combat equipment complex into echelons. Taking into account the differences in the content of tasks, duration of actions and conditions of their performance, it is important to create preconditions for achieving high efficiency of servicemen in the performance of each type of task. An important role in creating such prerequisites is played by the distribution of a set of items provided for by the supply standards by echelons. A rational distribution will allow a serviceman to carry those items that are necessary for life support during the performance of specific tasks, without overloading him with unnecessary (surplus) property. The task of echeloning the combat equipment complex of a serviceman of the NGU by elements of material and food supply can be formulated using a theoretical-multiple approach. In order to find effective solutions for the echeloning of items of clothing and food supply, it is necessary to identify and study the factors that affect the needs of a serviceman in combat equipment items for specific special (combat) tasks, to introduce appropriate indicators, selection criteria and quantitative restrictions imposed on the values of the echelons' parameters.","PeriodicalId":41825,"journal":{"name":"DOKLADY NATSIONALNOI AKADEMII NAUK BELARUSI","volume":"13 1","pages":""},"PeriodicalIF":0.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90358641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Main economic traits of cows of the factory lines Bukem 66636657 and Blitz 17013604 of the Holstein breed of dairy cattle of domestic selection","authors":"I. Sheiko, U. N. Tsimashenka, D. M. Bagdanovich, N. V. Klimets, N. I. Pyasotski, Zh. I. Shemetavets, A. Muzyka","doi":"10.29235/1561-8323-2022-66-5-552-560","DOIUrl":"https://doi.org/10.29235/1561-8323-2022-66-5-552-560","url":null,"abstract":"The Holstein breed of dairy cattle is the most widespread due to its high productivity (7000–11000 kg of milk with 3.6–3.8 % of fat and 3.0–3.2 % of protein), good adaptability to a variety of climatic, feed and technological conditions, as well as a high feed conversion ratio. In this regard, the breeding of animals of this breed, including the pedigree breeding and the creation of optimal conditions for directional rearing of young animals, is of great importance for the economy of the Republic of Belarus. Any breed is characterized by a distinctive quality, a certain structure, and specific morphological and economically useful traits. The goal of our work was to analyze the main economically useful traits of two new factory lines Bukem 66636657 and Blitz 17013604 of the Holstein breed of dairy cattle of domestic selection. To achieve this goal, we used the UE “GIVC Minselhozproda” information database of pedigree dairy cattle bred at basic farms. It has been established that cows of new factory lines are characterized by high milk productivity rates, good reproductive performance and sufficient development regardless of breed line. The effective use of animals of new factory lines will increase the genetic potential of milk productivity of herds, allowing for obtaining high-value young pedigree cattle of domestic origin.","PeriodicalId":41825,"journal":{"name":"DOKLADY NATSIONALNOI AKADEMII NAUK BELARUSI","volume":" ","pages":""},"PeriodicalIF":0.1,"publicationDate":"2022-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48322933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Heterologous expression of diadenylate cyclase in the form of inclusion bodies with enzymatic activity","authors":"M. Vinter, I. Kazlouski, A. Zinchenko","doi":"10.29235/1561-8323-2022-66-5-509-516","DOIUrl":"https://doi.org/10.29235/1561-8323-2022-66-5-509-516","url":null,"abstract":"Using the DNA recombination technique, a new bacterial strain Escherichia coli DAC-22 was derived, whose cells are able to carry out the heterologous expression of Bacillus thuringiensis diadenylate cyclase – the enzyme catalyzing the reaction of adenosine-5′-triphosphate (ATP) transformation into cyclic 3′,5′-diadenylate (cyclo-di-AMP). To derive the strain, E. coli “Rosetta (DE3) pLysS” cells were originally used as recipients of plasmid pET42a+ with the inserted gene disA encoding diadenylate cyclase of B. thuringiensis. The cells of the recombinant strain are able to produce heterologous diadenylate cyclase localized predominantly (by 90 %) in the fraction of the catalytically active inclusion bodies. The productivity of the new strain with respect to diadenylate cyclase structurally arranged as the inclusion bodies was 720 units/l of cultural fluid. The inclusion bodies formed by the newly engineered strain are intended for use in the technology of producing pharmacologically promising cyclo-di-AMP.","PeriodicalId":41825,"journal":{"name":"DOKLADY NATSIONALNOI AKADEMII NAUK BELARUSI","volume":" ","pages":""},"PeriodicalIF":0.1,"publicationDate":"2022-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49411448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Predictive significance of a complex approach in determining the vascular wall stiffness parameters in patients with arterial hypertension and in patients with arterial hypertension after ischemic stroke","authors":"V. Kindaliova, T. Pronko, M. A. Dobrodey, S. Gubkin","doi":"10.29235/1561-8323-2022-66-5-525-532","DOIUrl":"https://doi.org/10.29235/1561-8323-2022-66-5-525-532","url":null,"abstract":"The article presents the information about the predictive significance of a complex approach in determining vascular wall stiffness parameters. A total of 159 people with arterial hypertension (AH) and AH after a previous ischemic stroke were examined. A model with a conditional linear predictor (LP) was constructed, using a binary regression equation with a probit-link function for prediction of cardiovascular events. LP is a combination of indicators such as age (А), glomerular filtration rate (CKD-EPI), pulse wave velocity (PWV), intima- media thickness (IMT), cardio-ankle vascular index (CAVI) and augmentation index (AI). The equation has the following form: LP = –6.6139 – 0.0978A + 0.031CKDEPI + 0.0758PWV + 3.2086IMT + 0.4421CAVI + 1.2429AI. The cut-off threshold for LP = 0.0238, sensitivity (Se) 85.71 %, specificity (Sp) 77 % and accuracy (Acc) 78.07 %.","PeriodicalId":41825,"journal":{"name":"DOKLADY NATSIONALNOI AKADEMII NAUK BELARUSI","volume":" ","pages":""},"PeriodicalIF":0.1,"publicationDate":"2022-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44477424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Productivity and grain nutritional value traits in wheat genotypes with different NAM-B1 gene allelic variations","authors":"O. Orlovskaya, S. Vakula, K. Yatsevich, L. Khotyleva, A. Kilchevsky","doi":"10.29235/1561-8323-2022-66-5-517-524","DOIUrl":"https://doi.org/10.29235/1561-8323-2022-66-5-517-524","url":null,"abstract":"The identification of a functional NAM-B1 allele associated with a high content of grain protein and essential microelements in wheat relatives increased the distant hybridization significance for bread wheat nutritional value. The allelic polymorphism of the NAM-B1 gene in 22 wheat lines with a genetic material of T. dicoccoides, T. dicoccum, T. spelta, T. kiharаe and their parental forms and the effects of NAM-B1 gene allelic variations on the content of grain protein and essential microelements and productivity traits (vegetation period 2017–2021) were evaluated. The functional NAM-B1 allele was identified only in the samples of wheat relatives among the parental forms. All parental varieties and most of introgressive lines (77.3 %) had a non-functional allele. The genotypes with the functional NAM-B1 allele were characterized by a higher plant height and tillering, but by lower spike productivity compared to the non-functional allele genotypes. The presence of the functional NAM-B1 allele provided a high level of grain protein and zinc content and never decreased significantly a thousand-kernel weight across all studied environments. The functional NAM-B1 allele introgression could be a resource for improving the grain wheat nutritional value.","PeriodicalId":41825,"journal":{"name":"DOKLADY NATSIONALNOI AKADEMII NAUK BELARUSI","volume":" ","pages":""},"PeriodicalIF":0.1,"publicationDate":"2022-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48874246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Western structural closing of the Pripyat–Dneprov–Donetsk aulacogen","authors":"R. E. Aizberg, Y. Gribik, R. Garetsky","doi":"10.29235/1561-8323-2022-66-5-533-543","DOIUrl":"https://doi.org/10.29235/1561-8323-2022-66-5-533-543","url":null,"abstract":"In segmented paleorift systems such as the Pripyat–Dnieper–Donetsk aulacogen, which penetrate deep into the continent from the side of the paleoocean margin and most often close here, each segment represents an autonomous structure of the lithosphere. The presented article shows that the tectonic position of the Pripyat paleorift as the western closing segment of the indicated aulacogen was due to a change in the intensity of syn-rift and plate-tectonic processes in the extended rift system from east to west. In the band of the Paleoproterozoic Fenno-Sarmatian collision, the Central Belarusian suture zone of the Central Russian transpression belt isolated by S. V. Bogdanova in 2018 was a blocking transverse barrier to relative development of Hercynian synrift processes in the western direction.","PeriodicalId":41825,"journal":{"name":"DOKLADY NATSIONALNOI AKADEMII NAUK BELARUSI","volume":" ","pages":""},"PeriodicalIF":0.1,"publicationDate":"2022-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48864820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Increasing the densification efficiency in the manufacturing technologies of high-density carbon-carbon composite materials","authors":"A. F. Ilyushchenko, O. Prokhorov, N. V. Krivulenko","doi":"10.29235/1561-8323-2022-66-5-544-551","DOIUrl":"https://doi.org/10.29235/1561-8323-2022-66-5-544-551","url":null,"abstract":"Carbon-carbon composite materials (CCCM) are used in extreme environments due to their high-temperature erosion resistance, ablative resistance, and high mechanical performance at extremely high temperatures. The production of such materials includes several cycles of gas-phase or liquid-phase compaction of a porous reinforcement of carbon fibers. The article analyzes the main parameters and technological schemes of densification, and their role in manufacturing CCCM. Conditions of optimizing technological regimes and routes of multi-cycle densification for obtaining high-density CCCM with a minimum number of cycles are proposed. A method for calculating density and porosity changes during multi-cycle compaction of CCCM is developed. The accuracy of this method is confirmed by experimental data.","PeriodicalId":41825,"journal":{"name":"DOKLADY NATSIONALNOI AKADEMII NAUK BELARUSI","volume":" ","pages":""},"PeriodicalIF":0.1,"publicationDate":"2022-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47810384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}