bluuebunny/crossref_metadata_2025_split huggingface dataset:
On the issue of calculating the force factors acting on the working bodies of a single rotor screw compressor
Authors: Pronin V , Zhignovskaia D , Minikaev A , Yerezhep D 
Published: May 2020

Abstract
The subject of research is a single rotor screw compressor. For the proper compressor design, the forces and moments must be calculated. The cutter’s teeth have a circular shape, therefore, the calculation is reduced to the determination of a torque. This power calculation is based on the law of pressure change in closed cavities of a single rotor screw compressor depending on the angle of a screw rotation and the law of change in the horizontal projection area of a cutter’s tooth meshed with a screw, depending on the angle of a cutter rotation. The term “flat closed figure” in our task means the horizontal projection of the disk cutter’s tooth part meshed with a screw, which takes the form of a triangle or trapezoid. The work shows a horizontal projection of the engagement rotor screw with a disk cutter. To determine the torque acting on the central screw, it is necessary to calculate the circumferential forces acting on the screw and the shoulders of the application forces. The calculation method described above allows one with a sufficient degree of accuracy to determine the forces and moments acting on the working bodies of a screw single-rotor compressor, and therefore, to calculate the deformation of the parts of a screw single-rotor compressor.
Study of convective heat transfer in small-diameter channels
Authors: Gerasyutenko V V , Sharkov A V , Korablev V A , Kayalajnen A V , Minkin D A 
Published: May 2020

Abstract
This paper investigates the convective heat transfer in a tube made of stainless steel 12X18H9T with outer diameter of 2 mm and inner diameter of 1.5 mm. For the research an experimental setup has been designed and assembled. The experimental setup consists of a fluid pumping system and flow-measuring device, working area, electrical power system and temperature measuring system. The experiment studies of heat transfer intensity in small diameter channels are performed. The study compares experimental data obtained with the theoretical ones. The paper presents the graphs of the Nusselt criterion dependence on the Reynolds criterion and the dependence of the convective heat transfer coefficient on the Reynolds criterion.
Choice and justification of the optimum cooling temperature for HTS cable
Authors: Glushaev A V , Sokolova E V , Kravchenko D V , Kirilov D N , Khrustovskaia D A , Ivanov L V 
Published: May 2020

Abstract
At the first stage of designing a high-temperature superconducting (HTS) cable and its cryogenic refrigeration system (CRS), it is necessary to choose the optimum cooling temperature. The operating temperature is selected not only according to the critical parameters of the HTS conductor, but also taking into account other design and operational characteristics - geometry, length, operating current and the need to have subcooled nitrogen to prevent the occurrence of steam inclusions. Normally the range of cooling temperatures is limited by the critical temperature of the HTS conductor (THTS≤ 104К) and the triple point temperature of nitrogen (TLN≥ 63.15K). The choice of a certain temperature value will enable us to approximately evaluate the parameters of the CRS and overall characteristics of the cable. The article presents an analysis of the dependence of the electric power magnitude consumed by the CRS on the choice of the cooling temperature value and cable geometry. The analysis may be useful for determining the characteristics of the HTS cable operating at different temperature levels.
The use of sprayed powders to create coatings in the welds of oilfield pipelines
Authors: Ermakov B S , Alkhimenko A A , Shaposhnikov N O , Ermakov S B , Shatsky T E , Igolkin A F 
Published: May 2020

Abstract
The most damaged elements of oil field pipelines are welded joints, the life of which often does not exceed one or two years. The problem of anticorrosive protection of internal surfaces of welded pipe joints has not been solved to date. In this paper, the possibility of applying powder protective stainless coatings to the inner edges of the pipe adjacent to the annular weld is considered. The research of corrosion resistance and mechanical properties of pipe welded joints is presented.
Study of the structural state of the metal welded joint 2.25Cr-1Mo-V steel depending on the parameters of post-weld heat treatment
Authors: Titova T I , Shulgan N A , Borovskoy A S 
Published: May 2020

Abstract
The results of studies of the structural state and properties of welded joints of steel 2.25Cr-1Mo-V after various modes of post-weld heat treatment are presented. The study of all zones of the welded joint using an optical microscope at magnifications up to 1000 times was conducted. It was established that the structure of the weld metal and HAZ of the welded joint 2.25Cr-1Mo-V steel in all thermal conditions is represented by bainite with different contents and distribution of the carbide phase. The level of hardness of the welded joint in Vickers units according to ASTM E92 is studied. The following critical values of the Larsen-Miller parameter were determined: for which the weld metal and HAZ ensure the absence of brittle structures with hardness higher than 350 HV10, exposed to hydrogen and the formation of cold cracks, at which the required level of hardness for trouble-free operation is not more than 248 HV10 and at which the coagulation of carbides is too intense and leads to a decrease strength properties.
The study of thermal processes of the skin of the object of the whole-body cryotherapy (WBC) using numerical analysis
Authors: Yerezhep D , Minikaev A , Zhignovskaia D , Pronin V , Yerezhep A 
Published: May 2020

Abstract
The work investigated the thermophysical processes occurring in the cryosauna during cryotherapeutic effects on the human body. Experimental studies in the field of the whole-body cryotherapy (WBC) are complex, since studies are necessary in such a wide range of environmental parameters as phase state, temperature, heat flux density, gas flow velocity in the cryosauna. One of the solutions to this problem is the development of computer models of the processes of heat transfer of a biological object in a cryosauna, allowing a wide range of studies to be carried out without human experiments. In this paper, we analyze a modification of the design of a cryochamber with a biological object. In this work, several types of computer models will be created, the models of which vary depending on the geometry of the wall of the cryosauna chamber from 90 to 85 degrees. The paper will show how much it is necessary to pay attention to the geometry of the cryosauna and work on the modification of the geometry. This work shows that when the geometry of the wall of the cryosauna was changed, it turned out that it smoothed the temperature distribution along the length of the object, which, in turn, will positively affect further research in this area. The results can be applied to optimize the supply of cryogenic gas in saunas, further geometry modernization, as well as to increase the efficiency and safety of the WBC process.
Study of steel hardness effect on the abrasive wear resistance
Authors: Berezin N M , Peregudov A A , Andreev A K , Igolkin A F , Vologjanina S A 
Published: May 2020

Abstract
In the course of developing the territories of the shelf of the Northern seas, the Far East and Siberia, the problem of cold-breaking materials was particularly acute. More than half of the territory of the Russian Federation is located North of the January isotherm, which has a temperature of - 20 °C. In such areas, the performance of equipment, especially in winter, falls sharply. Breakdowns of tractor and bulldozer parts in winter, compared to summer, occur more often up to 6 times, and excavator parts - up to 7 times. At the same time, it was revealed that the most dangerous period of starting machines after stops. To prevent major breakdowns at temperatures less than - 35 °C, excavators, drilling rigs, and construction vehicles are stopped. And this is despite the fact that in accordance with the operating regulations, they must be operated throughout the year. The performance of mining equipment is greatly affected by wear. Unsatisfactory resistance of cast parts at low temperatures leads to large downtime and large economic losses. The relationship between hardness and resistance to abrasive wear is considered. Abrasive with different particle sizes was used for the tests. It is shown that there is no linear relationship between hardness and resistance to abrasive wear, that in conditions of low abrasive rocks it is enough to have average hardness values of the order of 47-50 HRS, and when working in highly abrasive rocks it is necessary to strive to obtain high hardness values of about 50-55 HRS.
Study of the rheological characteristics of the potato-based fish and vegetable mixture melt in the pre-die zone of a single-screw extruder
Authors: Aksenova O I , Alexeev G V , Temershin D D 
Published: May 2020

Abstract
This paper presents study of the rheological characteristics of the melt of the fish and vegetable mixture biopolymer in the pre-die zone of a single-screw extruder. The analysis of the flow index, being less than one, and that of the flow curves of the fish and vegetable mixture biopolymer melt, intended for production of expanded potato snacks, showed that the melt in a certain range of deformation rates can be attributed to pseudoplastic fluids. The results of the study represent important data in the design of the extruders molding units, on which the stability of the finished products quality depends. The results of the study can be used for mathematical modelling of the flow of the biopolymer melt in the pre-die zone of the extruder and can serve as justification of the screw rotational speed range in order to obtain extrusion foodstuffs of stably high quality.
The ecotoxicological aspects of using the marine benthic invertebrates skeleton in the production of active calcium substances
Authors: Oripova A A , Ovsuk E A , Sergienko O I , Uliyanov N B , Oripov U 
Published: May 2020

Abstract
Marine benthic invertebrates are susceptible to the accumulation of heavy metals and other pollutants from the environment, leading to the impossibility of their use as raw materials in the food production and pharmaceutical industry. In this paper, the accumulation of heavy metals in the shells and needles of Strongylocentrotus sea urchins was studied to assess the safety of the use of this raw material in the production of active calcium substances for food and medical purposes with the use of voltammetry analysis and capillary electrophoresis. High levels of strontium accumulation in the studied samples were revealed, indicating the unfavorable situation of commercial waters with respect to the presence of mobile forms of strontium.
The prospects for the use of electrogasdynamic systems in dry ice-cold generators of refrigerated trucks
Authors: Babakin B S , Voronin M I , Suchkov A N , Babakin S B 
Published: May 2020

Abstract
Cold sources for cooling refrigerated vans are divided into temporary ones, ensuring the maintenance of the required temperature in the body without recharging the batteries for cold cooling for a limited period, and constant, ensuring the maintenance of the set temperature without periodically renewing the supply of cold. Temporary sources of cold include ice-salt mixture, dry ice, frozen eutectic solutions, installations with liquid nitrogen. A constant source of cold is engine cooling. Dry ice cooling is devoid of the main disadvantages of other methods. It has a relatively high refrigerating effect with a relatively small volume occupied by dry ice. Dry ice cooling can be carried out by contact and non-contact methods. In the contact method, the blocks of dry ice are not separated from the product, due to which carbon dioxide pairs wash the products. With the non-contact method, dry ice is loaded into hermetically sealed containers. The authors have proposed an environmentally friendly, reliable scheme of the process of cooling the body of a refrigerator with carbon dioxide using electrophysical methods. EGD devices with moving and stationary electrodes developed by the authors were used as pathogens for the circulation of the gas mixture in an isothermal body, which allowed to reduce the consumption of solid carbon dioxide.
On the issue of the usage of sealed containers for cooling the refrigerant in refrigerated trucks
Authors: Babakin B S , Suchkov A N , Voronin M I 
Published: May 2020

Abstract
The paper deals with the problem of using machine-free cooling in refrigerated trucks for intercity transportation in order to ensure environmental safety and to eliminate noise from a working refrigeration machine when unloading refrigerated products from refrigerated trucks to the distribution network. A machineless method for cooling the body of a refrigerator truck with cold accumulators without direct contact with a cooling medium due to the usage of frozen sealed containers is proposed. The accumulation of cold (AC) is carried out, as a rule, due to the heat of the phase transition at the melting point or crystallization of individual substances or there mixtures. The research of water-salt systems, which are widely used for temperature stabilization in refrigeration, for storage and transportation of medicines and food products, is presented. The results of the melting and freezing of three cold storage substances, which are H2O and water-salt solutions with NaCl concentrations of 8 and 13 % are presented. According to the results of studies, the usage of pressurized containers in refrigerated trucks with machine-free cooling is beneficial and opens up great opportunities for cooling the air in various destinations.
Influence of Concrete Strength on the Stress-Strain Behavior of Spirally Confined Recycled Aggregate Concrete
Authors: Munir Muhammad J , Kazmi Syed M S , Wu Yufei , Patnaikuni Indubushan 
Published: May 2020

Abstract
Costly and non-environment-friendly methods are used to improve the inferior behavior of recycled aggregate concrete (RAC). Conversely, the strength enrichment of concrete due to confinement provided by lateral reinforcement is ignored in the design of concrete compression members. The focus of this study is to investigate the role of pre-existing transverse reinforcement and different design strengths of concrete on the stress strain behavior of RAC. For this reason, stress-strain behavior of spiral steel confined concrete specimens having variable confinement pressure, recycled aggregates (RA) replacement percentage and design strength is investigated. The results show a drop in compressive strength of concrete with the increase in replacement percentage of RA. However, steel confinement has a positive role to counterbalance the adverse effect of RA replacement on concrete strength. Improved ductility and stress-strain behavior of RAC are observed with the increase in confinement pressure. Based on the results, the un-utilized pre-existing steel spiral reinforcement in the concrete compression members can offset the inferior performance of RAC resulting into sustainable and cost-effective construction.
Adaptability of Materials in Green Buildings: Australian Case Studies and Review
Authors: Gharehbaghi Koorosh , Rahmani Farshid , Paterno David 
Published: May 2020

Abstract
Globally, more and more buildings are constructed as the basis of green methodology. Green building methodology includes the reduction of energy from the conception through the operation phases. Importantly, the practice of green building is gradually becoming more regulatory compliance rather than optional. Subsequently, this paper will carefully review the adaptability of materials in green buildings. In supporting such aim, this paper will also reviewed five Australian case studies. For these building, as a part of adaptability of green materials, recycled concrete, metal and timber were utilized. It was found that most benefits of adaptability of materials for these buildings were significantly improved with the integration with sustainable design. Such alignment is the key for effective material selection and usage in green buildings. The use of green materials alone may be not be enough to considerably reduce the energy usage. Holistically, the green design together with recycled materials need to be combined to deliver efficient green buildings.
A Study on Properties of Concrete Made with Processed Granulated Blast Furnace Slag as Fine Aggregate
Authors: Vibha Venkataramu , Venkatarama Reddy B V 
Published: May 2020

Abstract
This study focusses on understanding the influence of processed granulated blast furnace (PGBS) slag on fresh and hardened state properties of concrete. Nowadays, metallurgical slags are being explored as alternative materials to natural virgin aggregates in concrete. Before using any such material in concrete, it is important to understand its influence on properties of concrete. In this study an attempt has been made to use granulated blast furnace slag from a local steel plant as a substitute to natural sand in normal concrete. The study mainly focusses on understanding the influence of different replacement ratios and suitability of slag replacement ratios higher than 50% in normal concrete. The blast furnace slag used in the present study was processed using a vertical shaft impactor to modify the particle shape and enhance its aggregate properties. The replacement was done at 50%, 75% and 100% by mass of natural sand in the concrete mix. The concrete properties such as slump, compressive strength, splitting tensile strength and flexural strength, were studied at all the replacement ratios.
Conceptual Residential Design Framework to enhance Well-being of Elderly in Thailand
Authors: Ruengtam Porntip 
Published: May 2020

Abstract
A conceptual residential design framework was modelled using healing environmental and universal design concepts to enhance the well-being of the elderly in Thailand. Research methods involved informal interviews and observations for three Thai case studies. Interview results were summarized with related theories and literature. All factors were collated and listed. Seven experts in related fields were employed to confirm the factors and framework following the Delphi technique. Results showed that elderly characteristics had a positive direct effect on requirements of the elderly in a residential community which comprised two sub-factors including (1) healing environment, and (2) universal design. Each factor affected the willingness of the elderly to join communal events of the residential community. This framework will be used for quantitative analysis to determine future policy for environmental design and management of residential communities to enhance the well-being of the elderly in Thailand.
Local Climate Zones Definition in Relation to ENVI-met in the City of Dubai, UAE.
Authors: Bande Lindita , Manandhar Prajowal , Marpu Prashanth , Battah Mohammad Al 
Published: May 2020

Abstract
The city of Dubai has experienced a rapid urban growth in the last 60 years. Located in the north west of the United Arab Emirates, Dubai has a linear development expanding mainly towards the coast. However recently this expansion is going towards the desert. Mapping such development creates a history that is relevant to many research entities. WUDAPT is a network that facilitates city mapping. With open source tools it is possible to create Local Climate Zones (LCZ). This zones have similar properties. Therefore, in the end of the process it would be possible to see the most dense urban areas of the city where the UHI phenomena is higher.
The process of mapping involves, Google Earth Pro, high definition satellite images and the CFD software, ENVI-met. The first two tools detect the LCZ and create the general map of the city. Then this map is compared with the validated models of ENVI-met. This comparison shows the connection of the UHI between one approach and the other. The site data taken from an open-source are used as a boundary condition in the simulations. The climate of Dubai is hot arid, with high temperatures in the summer and cool winters. The spring and autumn are short periods of 2-4 weeks.
The aim of this study is to detect problematic areas in the city in terms of surface/air temperature, high levels of UHI. This detection helps understanding where should be intervened in order to have more walkable districts.
Cyclic Tests of Joints of Glued Wooden Structures
Authors: Aruova L B , Ospanova Z N , Aruov B B , Alibekova N T , Shashpan Zh A , Kyrgizbaev A T 
Published: May 2020

Abstract
The use of large-span structures made of glued wood in countries with large timber reserves in Finland, Sweden, Norway, Russia, the USA and Canada has shown that this can be quite interesting and expressive from the architectural position of the building. Sports facilities, sports and sports facilities, sports facilities, sports and cultural facilities. The practice of building bridges made of glued wood in these countries shows that they have been in operation for decades without additional operating costs. Glued wood in modern conditions, when productive flame retardants are used that protect it from fire, antiseptics from possible decay expand the scope of such structures. One of the important obstacles to the limiting applications of large-span glued wooden structures is the complexity of the solution nodes. Bearing structures experience difficulties when exposed to static and cyclic loads. Cyclic loads can be caused by wind loads, production equipment, traffic, and seismic processes. Reinforcement in wood, reinforcement and reinforcement under load. Wood and metal are resistant to cyclic loads. Studies will be conducted at the border of the elements to be glued. This article presents the results of tests for the effects of static and cyclic loads on reinforcement from a 14 mm reinforcing bar of class A5 on FRF-50T along natural-sized glued wood fibers. Certain coefficients of the endurance of the compound when exposed to cyclic loads with two load asymmetry coefficients p = 0.5 and p = 0.2.
Performance of buildings around a long irregular excavation by top-down technique in downtown Nanjing
Authors: Gu Z X , Li H , Meng Z L , Lu H Z , Sun Y 
Published: May 2020

Abstract
A 1257 m-long irregular deep excavation was located in the city center of Nanjing, China. The full-width and half-width top-down construction method was adopted. The deformation characteristics of the settlement of adjacent buildings based on field data is discussed, and the interrelationships between building settlement and excavation process, structural system and geological conditions are also considered. The analysis results show that building settlement is related to the excavation deformation, construction sequence, structure forms, foundation types and the distance to the foundation pit. Corner effect has played an important role in building settlement and will affect the settlement pattern eventually. The settlement surface of building outside the pit corner is three-dimensional, while the building located in the middle of the long side of the pit has a two-dimensional settlement surface.