bluuebunny/crossref_metadata_2025 huggingface dataset:
Acetyltransferases GCN5 and PCAF are Required for B Lymphocyte Maturation
Authors: Oksenych Valentyn , Su Dan , Daniel Jeremy A.
Published: December 2021

B lymphocyte development has two DNA recombination processes: V(D)J recombination of the immunoglobulin (Igh) gene variable region and class switching of the Igh constant regions from IgM to IgG, IgA, or IgE. V(D)J recombination is required for successful maturation of B cells from pro-B to pre-B to immature-B and then to mature B cells in the bone marrow. CSR occurs outside of the bone marrow when mature B cells migrate to peripheral lymphoid organs, such as spleen and lymph nodes. Both V(D)J recombination and CSR depend on an “open chromatin” state that makes DNA accessible to specific enzymes, recombination activating gene (RAG), and activation-induced cytidine deaminase (AID). Acetyltransferases GCN5 and PCAF possess redundant functions acetylating histone H3 lysine 9 (H3K9). Here, we generated a mouse model that lacks both GCN5 and PCAF in B cells. We found that double-deficient mice possess low levels of mature B cells in the bone marrow and peripheral organs, an accumulation of pro-B cells in bone marrow, and reduced CSR levels. We conclude that both GCN5 and PCAF are required for B cell development in vivo.
Clinical Manifestation and Diagnostic Process of Celiac Disease in Poland – Comparison of Pediatric and Adult Patients in Retrospective Study
Authors: Majsiak Emilia , Choina Magdalena , Gray Alastair M. , Wysokinski Mariusz , Cukrowska Bożena
Published: December 2021

The diagnosis of celiac disease (CD) may be delayed due to non-specific clinical symptoms. The aim of the study was to evaluate the clinical manifestation and diagnostic process of CD in Polish children and adults. Methods: The members of the Polish Coeliac Society (n=2 500) were asked to complete a questionnaire on socio-demographic factors, clinical and diagnostic aspects of CD. The analysis was based on 796 responses from patients with confirmed CD diagnosis, and included 224 (28.1%) children and 572 (71.9%) adults. Results: The mean duration of symptoms prior to CD diagnosis in children was significantly shorter than in adults (p < 0.001), and amounted to 3.1 and 9 years respectively. The most frequent symptoms before CD diagnosis were abdominal pain and bloating in children (70.4%), and chronic fatigue in adults (74.5%). Although almost all CD patients claimed to strictly avoid gluten after CD diagnosis, symptoms were still present in the majority of these respondents. No comorbid diseases were reported by 29.8% of children and by 11.7% of adults (p < 0.001). Conclusions: The results indicate that CD diagnosis is delayed in Poland, espe-cially in adults, and clinicians should be aware of the diversity in CD presentation.
Effect of Ruthenium Oxide Content on the Electrochemical Characteristics of a Supercapacitor With a Carbon Black Electrode Formed by Electrophoretic Deposition
Authors: Kitsyuk Evgeny , Kakovkina Julia , Lebedev Egor , Kuzmin Dmitry , Alekseyev Aleksey , Ryazanov Roman
Published: December 2021

Controlling the ratio of capacitance and power of supercapacitors by changing the composition of the electrodes will allow to create optimal power systems for specific applications. For the formation of such electrodes, a method is required that combines the possibilities of creating a multicomponent composite with a high degree of uniformity of composition and morphology over the layer thickness. An example of such a method can be the eco-friendly method of electrophoretic deposition used in this work, which makes it possible to locally deposit a composite material from multicomponent suspensions at room temperature. We present an approach related to electrophoretic deposition from a suspension of composite material SuperC-RuO 2 , in which the ratio of the components can be changed to vary the proportion of electrochemical and electrical double layer storage. Nanocarbon, which has a large surface area, and ruthenium oxide with a significant electrochemical capacity, in combination, will allow combining high power and capacity in one device, and their ratio will determine the proportion of electrochemical and electrical double layer storage. In this work, approaches are investigated and recommendations are given for increasing the stability of suspensions, the effect of the composition of the suspension on the composition of composite electrodes and their capacitive and power characteristics is determined.
Comparison of social inequality in HPV vaccination among teenagers with parental reports and healthcare providers’ records in the 2019 National Immunization Survey-Teen.
Authors: Choi Sol Seo , Choi Bongkyoo
Published: December 2021

Background: Relatively little is known and inconclusive about social inequality in human papillomavirus (HPV) vaccination among teenagers in the United States. This study aims to investigate whether there is a social disparity in HPV vaccination among teenagers and if so, whether it can differ by the source of teen vaccination information (parental reports and provider records).  Methods: We used the data from the 2019 National Immunization Survey-Teen (NIS-Teen; 42,668 teenagers, aged 13-17) including parental reported vaccination status. Among them, 18,877 teenagers had adequate provider reported vaccination records. Two socioeconomic status (SES) measures were used: mother’s education and annual family income. Multivariate logistic analyses were conducted.  Results: False negatives of parental reports against provider records were more than two times higher (p < 0.001) in low SES teens than in high SES teens. In both SES measures, the proportion of HPV unvaccinated teenagers were lowest in the highest SES level in analyses with parental reports. However, it was the opposite in analyses with provider records. Interestingly, regardless of vaccination information source, the HPV unvaccinated rate was highest in the middle SES teens (>12 years, non-college graduates; and above poverty level, but not > $75K).  Conclusion: A significant social inequality in HPV vaccination among teenagers exists in the United States. The pattern of social inequality in HPV vaccination can be distorted when only parent reported vaccination information is used.
The Technique and Advantages of Contrast-Enhanced Ultrasound in the Diagnosis and Follow-up of Traumatic Abdomen Solid Organ Injuries
Authors: Di Serafino Marco , Iacobellis Francesca , Schillirò Maria Laura , Ronza Roberto , Verde Francesco , Grimaldi Dario , Dell'aversano Orabona Giuseppina , Caruso Martina , Sabatino Vittorio , Rinaldo Chiara , Romano Luigia
Published: December 2021

Trauma is one of the most common causes of death or permanent disability in young people, so a timely diagnostic approach is crucial. In polytrauma patients, CEUS has been shown to be more sensitive than US for the detection of solid organ injuries, improving the identification and grading of traumatic abdominal lesions with levels of sensitivity and specificity similar to those seen with MDCT. CEUS is recommended for the diagnostic evaluation of hemodynamically stable patients with isolated blunt moderate-energy abdominal traumas and for the diagnostic follow-up of conservatively managed abdominal traumas. In this pictorial review we illustrate the advantages and disadvantages of CEUS and the procedure details with tips and tricks during investigation of blunt moderate-energy abdominal trauma as well as during follow-up in non-operative management.
LENGTH-WEIGHT RELATIONSHIP AND RELATIVE CONDITION FACTOR OF 31 SMALL-SIZED FISHES OF THE PARANAPANEMA RIVER BASIN
Authors: FERRAZ João Daniel , GARCIA Diego Azevedo Zoccal , CASIMIRO Armando César Rodrigues , GELLER Iago Vinicios , ALMEIDA Fernanda Simões , ORSI Mário Luís
Published: December 2021

Studies on length-weight relationships are of great importance in fishery assessments. These studies are substantial to evaluate fish population dynamics, and in communion with the relative condition factor, could provide an estimation of potential acting environmental conditions. In this paper, we evaluated the length weight relationship and relative condition factor of small sized fish species. Fish were sampled quarterly between the years 2012-2013 and 2018-2020 in lagoons and tributaries of Rosana and Taquaruçu reservoirs, located at the lower Paranapanema River basin, Brazil. The standard length (SL) in millimeters and weight (W) in grams were measured, and the length-weight relationship was calculated using linear regression analysis (W = log (a) + b log (SL)). After, the relative condition factor (Kn) was calculated from the expression We = a.SLb. Thus, the length-weight relationships of 31 species were calculated in each environment considered, giving rise to 74 population allometric coefficients (b) and relative condition factors (Kn). As result, 24 b coefficients were concentrated between 2.5 and 3.5 and seven were out of the confidence interval, while the 74 Kn values demonstrated close to the central mean and not statistical different. Our results are relevant to the conservation of fish fauna, improving knowledge regarding small-sized fish and those living environment.
Pupuk Terhadap Kandungan Proksimat dan Mineral pada Suruhan Peperomia pellucida
Authors: Puluhulawa Yusrin Anton , Kandowangko Novri Youla , Solang Margaretha
Published: December 2021

Suruhan plant is one of the plants that has properties for treatment in various diseases such as diabetes mellitus, headache, fever, and rheumatism. In addition to traditional medicine, people usually use plants as an alternative food that is consumed by sautéing or consumed directly. The plant contains antioxidants, antimicrobials and anticancers. The leaves have flavonoids, alkaloids. Proximate content analysis is important to be used as data on the content of a foodstuff. One way to increase the content to be more useful is by cultivating using organic fertilizer. The purpose of this research is to find out the influence of organic fertilizers on the content of proximate, minerals on the plants. the method used was descriptive quantitative. Based on the results showed that on the content of proximate and minerals in the commission plants given organic fertilizer obtained water content of 26.60%, ash content of 16.80%, fat content of 2.58%, protein content of 13.86%, carbohydrates 40.16%, iron (Fe) 18.74 ppm, calcium (Ca) 255.92 ppm.
Pertumbuhan Berbagai Macam Bahan Eksplan Kentang Atlantik secara In Vitro dengan Perlakuan IAA
Authors: Rohmah Anisah Shofhatur
Published: December 2021

Kentang kultivar Atlantik merupakan kentang untuk bahan baku industri pangan. Produktivitas kentang yang rendah disebabkan karena perbanyakan secara konvensional belum dapat menghasilkan benih berkualitas baik. Perbanyakan konvensional terkendala dengan akumulasi patogen, penurunan kualitas serta rendahnya tingkat multiplikasi. Kultur jaringan merupakan metode yang tepat untuk mengatasi permasalahan tersebut. Penelitian ini bertujuan untuk mendapatkan konsentrasi IAA yang tepat pada berbagai macam bahan eksplan kentang Atlantik. Penelitian dilaksanakan pada bulan Juli - Agustus 2020 di Laboratorium Kultur Jaringan Jurusan Agroteknologi Fakultas Pertanian Universitas Pembangunan Nasional Veteran Yogyakarta. Rancangan yang digunakan dalam penelitian ini adalah Rancangan Acak Lengkap (RAL) 2 faktor. Faktor pertama adalah konsentrasi IAA pada taraf 0,5; 1; dan 1,5 ppm; dan faktor kedua adalah macam bahan eksplan yaitu bagian pucuk, bagian tengah, dan bagian pangkal planlet, terdapat 9 kombinasi dan 3 kali ulangan. Pengamatan dilakukan pada 8 MST dengan parameter tinggi planlet, jumlah buku, jumlah tunas samping, jumlah daun, warna daun, panjang akar, dan bobot kering planlet. Hasil penelitian menunjukkan konsentrasi IAA 1 ppm dengan macam bahan eksplan bagian tengah secara interaksi dapat meningkatkan jumlah buku dan jumlah daun planlet kentang Atlantik. Konsentrasi IAA 0,5 ppm secara tunggal dapat meningkatkan tinggi planlet, jumlah tunas samping, panjang akar, dan bobot kering planlet kentang Atlantik. Macam bahan eksplan bagian tengah secara tunggal dapat meningkatkan jumlah tunas samping planlet kentang Atlantik.
RENEWABLE ENERGY INTEGRATION FOR HOT WATER SUPPLY AND HEATING OF BUILDINGS
Authors: Selikhov Yu. , Gorbunov K. , Stasov V.
Published: December 2021

Solar energy is widely used in solar systems, where economy and ecology are combined. Namely, this represents an important moment in the era of depletion of energy resources. The use of solar energy is a promising economical item for all countries of the world, meeting their interests also in terms of energy independence, thanks to which it is confidently gaining a stable position in the global energy sector. The cost of heat obtained through the use of solar installations largely depends on the radiation and climatic conditions of the area where the solar installation is used. The climatic conditions of our country, especially the south, make it possible to use the energy of the Sun to cover a significant part of the need for heat. A decrease in the reserves of fossil fuel and its rise in price have led to the development of optimal technical solutions, efficiency and economic feasibility of using solar installations. And today this is no longer an idle curiosity, but a conscious desire of homeowners to save not only their financial budget, but also health, which is possible only with the use of alternative energy sources, such as: double-circuit solar installations, geothermal heat pumps (HP), wind power generators. The problem is especially acute in the heat supply of housing and communal services (HCS), where the cost of fuel for heat production is several times higher than the cost of electricity. The main disadvantages of centralized heat supply sources are low energy, economic and environmental efficiency. And high transport tariffs for the delivery of energy carriers and frequent accidents on heating mains exacerbate the negative factors inherent in traditional district heating. One of the most effective energy-saving methods that make it possible to save fossil fuel, reduce environmental pollution, and meet the needs of consumers in process heat is the use of heat pump technologies for heat production.
NITRO CELLULOSE POWDER CHARGES OF LONG SERVICE LIFE: PROBLEMS AND THEIR POSSIBLE SOLUTIONS
Authors: Baulin D.
Published: December 2021

One of the components of the problem of Ukraine's national security is the loading of warehouses with a variety of ammunition with an expired guaranteed storage period.

The experience of storing ammunition shows that during long-term storage, propylene powder used in ammunition is capable of spontaneously undergoing various physical and chemical transformations, which negatively affects the ballistic characteristics of ammunition. The lack of ammunition production in Ukraine has led to the fact that ammunition is currently in operation, the storage time of which reaches 25-30 years or more.

This article analyzes publications devoted to scientific research related to the problems of ballistic stability of propellants.

A number of factors are presented that affect the physicochemical stability of powder charges during their long-term operation.

The generalizing data on changes in the main ballistic characteristics of ammunition at different periods of their storage are presented.

It is assumed that one of the ways to improve the ballistic and energy characteristics of ammunition with long service lives can be the regeneration of nitrocellulose powder charges. It is shown that at present there are no methods for the regeneration of propellant charges of long service life. However, there are encouraging data on the treatment of propellants with hydrogen peroxide, on the basis of which a technology can be developed for the complete or partial restoration of the ballistic and energy characteristics of the propellant charge.

It is presented that the predictive assessment of changes in the characteristics of ammunition with long service lives does not correspond to their real indicators.

It has been determined that the problem of nitrocellulose propellants of long service life is complex and, on the basis of its solution, theoretical and methodological foundations of the regeneration of nitrocellulose propellant charges can be developed to homologate the ballistic and energy characteristics of ammunition.
FEATURES OF OBTAINING GELS BASED ON AGAR-AGAR FOR COSMETOLOGY AND MEDICINE WITH ANTIBACTERIAL PROPERTIES
Authors: Lebedev V. , Miroshnichenko D. , Lendich E. , Borisenko L. , Savchenko D. , Mazchenko M. , Tikhomirova T. , Litvinenko E. , Vorozhbiyan R.
Published: December 2021

In the modern world, special attention is paid to materials with controlled characteristics. In this aspect, polymers and materials based on them have a number of specific properties for effective use in medicine and cosmetology. Humic substances satisfy most of these features, so their use is very important. The study of the features of the processes of gelation in polymer systems such as agar-agar, which has rather universal properties, makes it possible to use it as a basis for gels and polymer carriers, as well as in the processes of obtaining medical and cosmetic materials with different properties, which can be important in solving a number of topical issues. In particular, these are lightweight and cheap to manufacture antiseptic gels, dressings on wounds with absorption and protective properties, all kinds of cosmetics. In the article, a study was carried out to study the processes of gelation and the features of the rheological properties of hydrogels based on agar-agar in order to obtain modern hydrogels with an antibacterial effect. It was found that the introduction of humic acids into the composition of polymer hydrogels slows down the processes of structure formation, which leads to a decrease in the viscosity of all the studied compositions. Also, a decrease in the melting temperature of hydrogel jellies with an increase in the content of humic acids in them indicates a reduced level of gelation, which also leads to an increase in the time of loss of stickiness of polymer hydrogels. It has been shown that humic acids in polymer hydrogels have high antibacterial activity and almost completely stop the processes of mold formation in them. It was found that the most effective from the point of view of obtaining hydrogels with an antibacterial effect are agar-agar compositions with a humic acid content of 15 %. Thus, cosmetic polymer hydrogels with an antibacterial effect have been developed, which can be used in the treatment of hands, face and other areas of the skin that are open and contact for humans to combat coronavirus bacteria.
Partial Renewal is a Tool for an Increase in the Environmental Efficiency of the Worn-out Power Facilities
Authors: Voinov Oleksandr , Elkin Yuriy
Published: December 2021

The mankind created the global production that has an increasingly harmful effect on the natural environment. The present-day condition of natural environment causes much concern. A global environmental problem has inevitably emerged and now it requires a decrease in the intensity of the harmful action of available productive facilities. The purpose of the research done was to substantiate and find a potential opportunity for the use of a new approach to an increase in the level of ecological compatibility due to a partial renewal of the worn-out equipment. A substantial portion of the domestic energy equipment has a low level of the process-related functioning efficiency (including ecological efficiency). A global practice shows that the problems of the improvement of technological parameters can be solved in a different way to provide failure –free functioning of power facilities. The analysis of the circumstances existing nowadays in the field of the interaction of domestic power engineering and natural environment gives us an opportunity to adhere to the opinion that the use of the method of partial renewal is objectively affordable and it is a highly efficient tool for the reduction of the degree of harmful action on the part of power equipment. The purpose of this research paper was to show technological opportunities of the method of a partial renewal of worn-out engineering facilities (first of all power equipment and especially boiler plants) as an affordable tool for a decrease of the degree of their harmful action on the environment. Among the branches of the domestic industry, the power engineering branch needs badly a partial renewal and in the first turn these are boiler plants. This type of renewal is of vital importance for Ukraine that possesses a huge fleet of completely worn-out boiler plants. It is advisable to perform an integrated partial renewal. The partial renewal can involve all or individual parts of the entire chain of process elements. A successful fulfillment of the program of partial renewal is defined by a high quality control of the system of scientific and organizational-&-engineering problems relating to the renewal arrangement and realization. An issue relating to an index of the estimation of the extent of renewal of engineering facilities is of great importance. The capital inputs into the partial renewal are always justified for all intents and purposes. As for the conception of the renewal of the worn-out equipment the partial renewal can become an important launching low-cost step that will simplify the expected realization of the program of complete renewal.
MODELING THE ACTION OF THE SHOCK-WAVE LOAD ON THE HULLS ELEMENTS OF VEHICLES
Authors: Vasiliev Anton , Kutsenko Serhii , Tkachuk Mykola А. , Grabovskiy Andrey , Shatalov Oleg , Voloshina Iryna , Timofienko Vadim
Published: December 2021

To study the effect of shock wave load on the body elements of vehicles, a setting has been developed that takes into account the mobile nature of this load. A specialized parametric finite-element model of the body layout has been created armored-carrier, taking into account the peculiarities of the studied process. The problem of determining the stress-strain state armored-hulls solved in static and dynamic formulation. The space-time distributions of components and characteristics of the stress-strain state of the investigated model armored-carrier of armored hulls are given. The results of research in the used formulations indicate the need to solve the problem in a complete dynamic formulation with account for plastic deformations. This  establishes a new methodology for the rational choice of engineering solutions.
Keywords: stress-strain state; armored carrier; armored hulls; shock wave; moving load; sample; rational constructive decision
IN MEMORY OF PAVLO MYKOLAYOVYCH ANDRENKO
Authors: Tkachuk Anna
Published: December 2021

The bright memory of Pavelo Nikolaevich Andrenko will forever remain in the hearts of all who knew him
DIAGNOSTICS OF ROLLING EQUIPMENT SLIDING BEARINGS
Authors: Gaydamaka Anatoly , Yuri Yuri , Borodin Dmytro , Verba Il'ya , Krigіn Sergіj , Іshchenko Oleksandr
Published: December 2021

Peculiarities of rolling bearings operation are analyzed. Methods of diagnostics of general purpose sliding bearings and rolling equipment are considered. Direct control of the maximum allowable wear of plain bearings during operation is proposed. It is advisable to provide remote information and consulting services to technical services of metallurgical enterprises for maintenance, repair and operation of crankshaft bearings. Bearings of electric machines of drives of rolls of rolling mills work in extremely difficult conditions with considerable overloads in the environment of the increased vibration. This leads to premature wear of the liner and its fatigue failure. The technical condition of bearings of electric machines of drives of rolls of rolling mills for the purpose of an exception of an emergency stop of production is carried out by indirect control of temperature and vibration. However, these controls do not guarantee an avoidance of an emergency. All problems with working plain bearings can be grouped into three groups: insufficient bearing capacity of the lubricating layer, unregulated clearance between the shaft and the liner, unsatisfactory technical condition of the bearing surfaces. Insufficient bearing capacity of the lubricating layer is more often associated with loss of lubricant properties due to improper maintenance of the lubrication system. The discrepancy between the size of the gap between the shaft and the liner to the normalized value arises from design, technological and operational reasons.
Key words: plain bearing; failure; rolling equipment; direct wear control; remote information and consulting services
GENERAL ANALYSIS OF STRESS AND DEFORMATION OF PARTS MOVING WITH HIGH VELOCITY IN A LIQUID OR GAS (REVIEW ARTICLE)
Authors: Prokopenko Mykola
Published: December 2021

The article provides an analytical review and analysis of stresses and deformations of parts moving at high speeds in a liquid or gas. The working conditions of materials and parts of turbines (blades, rotor and casing) operating at high temperatures and loads are analyzed. The main ways of solving the problem of ensuring the strength of such parts are presented. The main ways to solve the problem of reliability of parts or the product as a whole are given: mathematical modeling (calculated determination of strength, durability and reliability); physical modeling (model testing); testing of full-scale products in reproducible real or operational conditions.It is impossible to speak about the strength of a part only from the calculation of deformations and stresses, even taking into account their change over time, so it is necessary to have strength criteria that establish the relationship between the strength parameters. It is emphasized that in the general case, the criterion of strength should answer the question: will the part collapse or not with the known laws of change in time of stresses, strains and temperatures It is shown that the considered standard characteristics of creep and long-term strength can be directly used in calculations only for those parts in which the uniaxial stress state at constant stresses and temperature is realized, when the working conditions of the material fully meet the test conditions of materials.An analytical view of deformation diagrams is considered as the main means of carrying out practical calculations of material strength. It is shown that in order to determine the stresses and strains in parts that move at high speeds in a liquid or gas, it is necessary to take into account the model of parts exploitation, the processes of creep and thermal fatigue of the material, and the unsteadiness of load processes.
Keywords: stresses and deformations of turbine parts; deformation diagram; operating model of turbine parts; creep and thermal fatigue; nonstationarity of loading processes
MODERN TRENDS OF DESIGN, RESEARCH AND USE OF HYDRAULIC MACHINES IN DRIVES OF MECHANISMS AND TRANSMISSIONS (REVIEW ARTICLE)
Authors: Serykov Volodymyr
Published: December 2021

The work is devoted to an overview of modern trends in the design, research and use of hydraulic machines in the drives of mechanisms and transmissions. The analysis of the use of hydromechanical transmissions has been carried out. The advantages and disadvantages of hydromechanical transmissions in comparison with mechanical ones are described. A brief overview of modern approaches to the design of new products, taking into account the existing information technologies, is carried out. We have analyzed modern software products designed to support the project at different stages of the product life cycle. It has been found that at the present time the appearance of individual variants of highly specialized software with a modern interface for synthesizing the structure of a designed product does not make it possible to solve the problems of synthesis and structural analysis of hydro-mechanical transmissions. A review of the analysis of operational factors affecting the fault tolerance and operating parameters of hydrostatic transmissions in general and hydromechanical transmission in particular is carried out. We have also considered the examples of technical solutions that allow to reduce the number of failures associated with the influence of one factor or another, as well as allow to reduce its influence on the parameters of the mechanism. The analysis of sources with information on the study of the parameters of hydrostatic transmissions using field tests or the mathematical apparatus developed by the authors is carried out. The ways of solving problems arising at the stages of design research are outlined.
Keywords: design, hydrostatic transmission, hydromechanical transmission, influence of operational factors, synthesis
PERFORMANCE INDICATORS OF CONCHOIDAL STRAIGHT SPUR GEARS WITH INCREASED LOADING CAPACITY. THE THEORY
Authors: Tkach Pavlo , Nosko Pavlo , Bashta Oleksandr , Boiko Grygorii , Herasymova Olha
Published: December 2021

The article is devoted to the actual problem of increasing the performance indicators of machine gear drives. To solve this problem, in the article proposed to use a conchoidal engagement made with a shifting of the  reference profile and special contact conditions. A feature of the proposed engagement is that it is less sensitive to manufacturing and assembly errors compared to conventional conchoidal engagement. As a result of theoretical studies, the performance indicators of such an engagement were determined. This made it possible to determine the level of load during further experimental tests of new gears. Contact strength and meshing losses were selected as performance indicators subject to further experimental verification. The ratios of these indicators, calculated for conchoidal spur gears with convex-convex contact, made with a shifting of the reference profile, with similar involute ones, are theoretically determined. Comparative analysis of performance indicators was carried out for gears of involute and conchoidal engagement with the same parameters and shifting of the reference profile. It was found that for experimental conchoidal drives with shifting, the maximum load is 1.2 times higher than that of a similar involute drive with shifting, and the loss in engagement is 21% less. A rational area of application of the new gearing is machine drives for high power transmissions.

Keywords: spur gears, conchoidal gearing, profile shift, convex-convex contact, meshing characteristics, teeth surface strength, gearing power loss
DEVELOPMENT OF STATISTICALLY AVERAGED MODELS OF DEFORMATION OF MATERIALS WITH RANDOM NETWORK STRUCTURE OF DIFFERENTLY ORIENTED FIBERS
Authors: Tkachuk Mykola M.
Published: December 2021

The paper describes the developed statistically averaged models of deformation of materials with a random network structure of differently oriented fibers. New methods of stress-strain analysis and micromacromechanical models of material deformation in the volume of bodies made of material with a network structure taking into account structural and physical nonlinearities have been created. These models are based on the micromechanics of network structures at the level of statistical sets of their chains. The novelty of approaches, models, methods and results is the creation of theoretical foundations for the analysis of the deformation of non-traditional network materials. Nonlinear mathematical models of material deformation in the form of a chaotic network structure of one-dimensional fragments are proposed, which are constructed involving fundamentally new approaches to the description of physical and mechanical properties at the micro level of statistical sets of fiber chains and spatial homogenization of their macroproperties. Compared to traditional models, they more adequately model the features of material deformation in the form of spatial chaotic and ordered network structures, as they do not involve a number of additional non-physical hypotheses. This creates fundamentally new opportunities not only for analyzing the properties of such materials, but also when creating new ones with specified properties. Using the created methods, models and research tools, the basis for solving a number of model and applied problems has been created. The nature of deformation of non-traditional materials with a network structure of one-dimensional elements is determined. The macro-properties of these materials are established on the basis of the developed micromechanical models, variational formulations and averaging methods.
Keywords: stress-strain state, network structures, contact interaction, finite element method, contact pressure, machine parts, variational formulation
TECHNOLOGY OF MANUFACTURE OF RADIO ABSORPTION CERAMICS
Authors: Lisachuk George , Kryvobok Ruslan , Zakharov Artem , Voloshchuk Valentyna , Maistat Mykyta , Sarai Vasyl
Published: December 2021

The object of the work is the technology of manufacturing radio-absorbing ceramics on the basis of facing tiles with the addition of silicon carbide. The method of hydrostatic weighing in water was used to determine the physical properties. X-ray phase analysis and spectral characteristics - transmission and reflection coefficients, in the frequency range 25.8 – 37.5 GHz were also determined. Tiles consist of two layers. First, separately obtain a press powder for the I and II layer of raw materials in a given amount, which were weighed, moistened, ground in a ball mill; the slip was dried in an oven, then ground and passed through a suitable sieve. The moistened press powder for the first layer was weighed and poured into a mold for pressing, after which the moistened press powder for the second layer was weighed and poured into the mold for pressing. The resulting raw material was dried. The semi-finished product was covered with watering and placed in an oven. The finished semi-finished product was fired in a silite furnace. The two-layer tile with an irrigated covering made on the developed technology was characterized by the following characteristics: water absorption – 9,8 %, imaginary density – 1,90 g/cm3. The developed ceramics, according to the classification, can be referred to the class of radio-absorbing ceramics.
DEVELOPMENT OF TECHNOLOGICAL PARAMETERS FOR THE FORMATION OF FASTS BY THE SLIDING CASTING METHOD
Authors: Bilohubkina Karyna , Fedorenko Olena , Kryvobok Ruslan , Zakharov Artem
Published: December 2021

The materials of the article consider the effectiveness of additives for stabilization and dilution of clay-free slippers. For theproduction of radio-transparent ceramic materials of Celsius-Willemite composition, the most efficient and energy-saving methodof production is the method of slip casting. According to the charge composition, this technology is complicated by the lack of claycomponents, which shows the need to use impurities to improve the rheology of such a slip. The main characteristics of aqueousceramic slippers are density, humidity, fluidity, viscosity, density factor, rate of mass accumulation. The slip must meet thefollowing requirements: be free from foam and gas inclusions, have satisfactory fluidity under low viscosity; be aggregativelystable (characterized by the absence of aggregation, coagulation and sedimentation of solid phase particles); have a high filteringcapacity to ensure fast and defect-free weight gain; to be chemically inert, to provide sufficient strength and low shrinkage of semifinished products, as well as the possibility of their easy release from the mold.
GENERAL TECHNOLOGY OF ENCRYPTION AND INTEGRATION OF DATA IN A PATTERN OF A PICTURE OF IMAGES THAT IS RESISTANT TO JPEG COMPRESSION
Authors: Kravchenko Oleksandr
Published: December 2021

The object of the thesis is the use of steganographic methods for organizing a covert communication channel in a public channel, providing resistance to lossy compression. The aim of the thesis is to develop an algorithm for embedding data into bitmap images that is resistant to JPEG compression and attacks on the container. In this thesis, the features of the JPEG algorithm are investigated, steganographic methods of information protection are analyzed, and a steganographic algorithm is designed that is resistant to JPEG compression and attacks on the container. Additional security is provided by the polyalphabetic substitution cipher and user secret key used to encrypt the original message. The algorithm was developed using the Python 3 programming language, the NumPy, SciPy, MatPlotLib libraries and the Jupyter Lab package. The task was completed using standard mathematical and statistical methods and tools of the high-level programming language Python 3.
DEFINITION OF METHODOLOGY FOR FORMATION OF PROFESSIONAL SKILLS IN THE APPLICATION OF INNOVATIVE TECHNOLOGIES IN FUTURE RESTAURANT BUSINESS TECHNOLOGISTS
Authors: Sabadosh Ganna
Published: December 2021

In article theoretical and empirical methods of research have been used: essence of the concepts «innovation», «innovative activity», «innovative process», etc. are considered by the author. Classifications of innovations by various signs are investigated. Introductions of an innovative component to technology of food and the offer of special services, application of the interactive (electronic) menu of the screen tablet on tables, the touch display, application of a QR code in marketing of the enterprise, the LED technology of the notification, food 3-D printers, touch producers of food, use of three-dimensional projections for demonstration of preparation of dishes, automation and informatization of processes at the enterprises, use of web and telecommunication technologies is analyzed in the article. The main directions of development of modern technologies in institutions of restaurant economy are: creation of restaurants as Free Floor; opening of food-courts; creation of the conceptual enterprises of restaurant economy; expansion of a network of the virtual restaurants providing the order on the Internet and delivery to the consumer; preparations of dishes in the presence of visitors; organization of service for system catering and others. New ideas, advanced restaurant products and services, technological processes, forms of the organization and management will be result of innovative development of institutions of restaurant economy. Introduction of innovations isn`t cheap, however having offered exclusive menus and services for clients, restaurant institutions are capable to ensure a survival and profit. Processes of high-quality transformation of the sphere in general and ensuring competitiveness of her separate objects are result of introduction of innovative technologies of rendering of services and formation of service according to modern requirements. Innovative development of restaurant technologies increases competitiveness of an institution in modern severe conditions. It is necessary to pay attention to the main current trends of development of science and equipment, a novelty and the invention in food sphere and in the market of services.
STARTUP PROJECTS MACHINE TRANSLATION STRATEGY
Authors: Bukhkalo Svetlana , Ageicheva Anna , Vypovska Anastasiia , Derkunska Zhanna , Pshychkina Nataliia
Published: December 2021

The importance of ICT usage implementation in the startup project is analyzed. It has been proved that translation is of great importance for any startup project for establishing relationships with potential clients around the world. The role of the translator in the startup project is investigated. Translation has been proven to be important for any startup project to build relationships with potential clients around the world. A comprehensive analysis of the translation of startup projects from Ukrainian into English using the latest information and communication technologies in this process. Peculiarities of using modern ICT in translating the description of startup projects from Ukrainian into English are revealed. Exploring the use of information and computer technology in the translation process. It is determined that it is important for a translator of a startup project to understand all the features of using the software, choose the appropriate programs or online tools and develop a strategy for the translation process in the project. The results of this work are very important and necessary for further study of the features of the use of ICT in the translation of startup projects
A potentiometric sensor for determination of hydrochinone
Authors: Petrushyna Galyna , Boyko Yuliya , Vishnikin Andrey , Bazel Yaroslav , Chygvintseva Olga
Published: December 2021

Hydroquinone has a high toxicity and therefore its content must be carefully monitored. The development of new easy-to-manufacture electrodes with the best analytical characteristics, which have a low cost of analysis, is an urgent task. An electrode based on graphite and a composite material consisting of polyurethane (as polymer matrix), graphite powder (to increase the electrical conductivity of the material) and 18-molybdodiphosphate (as a reagent) for hydroquinone determination was proposed. The advantages of polyurethanes for the electrodes modification include high adhesion of the polymer to the electrode surface due to the presence of a large number of polar groups. In addition, its specific properties provide high physical and mechanical properties of the polymer. The molybdenum heteropoly anion of the Wales-Dawson type 18-molybdodiphosphate anion P2Mo18O626- is a strong enough oxidant. The reaction between it and the some reducing agents is almost instantaneous, the recovery proceeds without destruction of P2Mo18O626-, which allows its repeated use. Interaction of P2Mo18O626- with different reducing agents occurs at different acidity of solutions. Thus, varying the pH of the solution allows determining of several substances in a compatible presence. Fine graphite powder in quantity from 50% to 70% was added in composite material to increase the electrical conductivity. P2Mo18O626- was added in an amount of 20% to the total weight of the composite material. The graphite electrode was modified with the synthesized polymer composite material. The main electrochemical characteristics of the proposed electrode are determined. Reduction of P2Mo18O626- with hydroquinone is proceeds in a neutral medium (pH 6). The response time at different concentrations of the hydroquinone is 8 min (at a temperature of 19 °C). This electrode does not have a "memory effect", the relative error is from 1.3 to 1.9%, and the potential deviation is in the range of 3-5 mV. The limit of determination is 2∙10-5 mol/l. The effect of the present substances was evaluated using a constant of selectivity. The proposed electrode has a high selectivity for a large number of inorganic ions. The electrode must be soaked in a solution of 3% hydrogen peroxide for 10 minutes to regeneration.
The mechanics of snow friction as revealed by micro-scale interface observations
Authors: Lever James , Taylor Susan , Song Arnold , Courville Zoe , Lieblappen Ross , Weale Jason
Published: December 2021

The mechanics of snow friction are central to competitive skiing, safe winter driving and efficient polar sleds. For nearly 80 years, prevailing theory has postulated that self-lubrication accounts for low kinetic friction on snow: dry-contact sliding warms snow grains to the melting point, and further sliding produces meltwater layers that lubricate the interface. We sought to verify that self-lubrication occurs at the grain scale and to quantify the evolution of real contact area to aid modeling. We used high-resolution (15 μm) infrared thermography to observe the warming of stationary snow under a rotating polyethylene slider. Surprisingly, we did not observe melting at contacting snow grains despite low friction values. In some cases, slider shear failed inter-granular bonds and produced widespread snow movement with no persistent contacts to melt (μ < 0.03). When the snow grains did not move and persistent contacts evolved, the slider abraded rather than melted the grains at low resistance (μ < 0.05). Optical microscopy revealed that the abraded particles deposited in air pockets between grains and thereby carried heat away from the interface, a process not included in current models. Overall, our results challenge whether self-lubrication is indeed the dominant mechanism underlying low snow kinetic friction.
ESTIMATING VARIABILITY, HERITABILITY, AND GENETIC ADVANCE OF RICE GENOTYPES IN MID-HILLS OF NEPAL
Authors: Lamichhane Sashi , Adhikari Nav Raj , K.C. Bishwas , Thapa Sapana
Published: December 2021

Rice is an essential staple food in Nepal but researches and varietal improvement programs are rarely carried out due to inadequate variability study. The field study was carried to diagnose the influence of genetic and environmental factors on yield traits to aid future rice breeding programs. Twelve genotypes were arranged in randomized complete block design with three replications from July to November 2019 at the research field of the Institute of Agriculture and Animal Science, Tribhuvan University, in the hilly area of Nepal. Analysis of variance showed significant difference for days to 50% booting, days to 50% flowering, plant height, panicle length, flag leaf area, filled grains per panicle, unfilled grains per panicle, fertility percentage, effective tillers m-2, straw yield, grain yield, 1000-grain weight, and harvesting index indicating the presence of variation in genotypes. LPN BR-1615 was the most promising genotype in grain yield. The values of Phenotypic Coefficient of Variation (PCV) were higher than Genotypic Coefficient of Variation (GCV) for each trait and low difference between them was found for days to 50% booting, days to 50% flowering, plant height, panicle length, grain yield, thousand-grain weight, fertility percentage, and harvesting index. Plant height, effective tillers m-2, and grain yield showed high heritability (i.e. 93.2%, 60.5% and 92.6%, respectively) and higher genetic advance as percentage of mean (i.e. 46.5, 34.6 and 50.1, respectively) . Thus, the experiment revealed that selections favoring plant height, effective tillers m-2, and grain yield would help in effective breeding programs of rice in future.
Classification of Hadith Topic of Indonesian Translation Using K-Nearest Neighbor and Chi-Square
Authors: Nabiilah Ghinaa Zain , Al Faraby Said , Dwifebri Purbolaksono Mahendra
Published: December 2021

Hadith is the main way of life for Muslims besides the Qur'an whose can be applied in everyday life. Hadith also contains all the words or deeds of the Prophet Muhammad which are used as a source of the law of Islam. Therefore, many readers, especially Muslims, are interested in studying hadith. However, the large number of hadiths makes it difficult for readers or those who are still unfamiliar with Islam to read them. Therefore, we conducted a study to classify hadith textually based on the type of teaching, so that readers can get an overview or other reference in reading and searching for hadith based on the type of teaching more easily. This study uses KNN and chi-square methods as feature selection. We also carried out several test scenarios, including implementing stopword removal modifications in preprocessing and experimenting with selecting k values ​​for KNN to determine the best performance. The best performance was obtained by using the value of k = 7 on KNN without implementing chi-square and with stopword removal modification with a hammer loss value of 0.1042 or about 89.58% of the data correctly classified.