bluuebunny/crossref_metadata_2025_split huggingface dataset:
Using linear regression with the least squares method to determine the parameters of the Solow model
Authors: Boyko A A , Kukartsev V V , Tynchenko V S , Korpacheva L N , Dzhioeva N N , Rozhkova A V , Aponasenko S V 
Published: July 2020

Abstract
The article shows that a simple method for calculating the values of the coefficients at which the production functions of Cobb-Douglas and Robert Solow best approximate statistical data, as well as determining the accuracy of the model and coefficients, is linear regression using the least squares method. By means of a regression analysis, the parameters of the effect of the introduction of innovative processes and the coefficients of the level of technology, labor elasticity and capital of production functions are determined. The initial statistics for the calculations were taken on the website of the Federal State Statistics Service in the relevant sections. Using the constructed functions, the influence of such factors as labor, capital, innovative processes on the long-term change in the volume of production in Russia was estimated, and the nature of the return on these production factors was determined. It is shown that the considered production functions in relation to real data demonstrate an increasing return on labor and capital. To determine the reliability of the approximation, a linear correlation coefficient (Pearson correlation coefficient) was calculated. As a result of calculations with the formula, the value of the Pearson coefficient r

xy
= 0.9844 was obtained. From the obtained value, it was concluded that there is a strong correlation between the variables, the variables correlate positively and the reliability of the approximation is high.
Investigation of the effect of various silicon contents on the crystallization pattern and the composition of silumin phases
Authors: Cherepanov A I , Kukartsev V A , Tynchenko V S , Korpacheva L N , Makarchuk I Yu , Dremin R S 
Published: July 2020

Abstract
Silumin is an alloy composed of aluminum and silicon, that can contain up to 22% of silicon. It has a low cost, wear resistance and low relative weight. The main industries for using silumin are aircraft manufacturing and mechanical engineering. Given the relatively low cost of the alloy, silumin is used to produce cheap household appliances, which are often not inferior in reliability to expensive analogues. Recently, silumin has gained particular popularity in the arms industry, especially for the production of air rifles. The properties of these alloys primarily depend on the Si content, which leads to changes in its microstructure. The paper presents studies of the effect of silicon content on changes in the nature of crystallization and phase composition of silumins with Si content from 1 to 21%.
Classical system approach to reverse engineering
Authors: Ivonov A V , Volkova E V , Daudov I M 
Published: July 2020

Abstract
The paper presents one of the possible solutions of the reverse engineering problem from the point of view of the classical system approach, as well as highlights the direction for the development of a complex software product. This approach will make it possible to change the modern practice of reverse engineering, which is applied everywhere. This practice requires expert evaluation by operator teams on non-acceptance basis. The approach proposed by the authors will significantly minimize human participation in this process.
Influence of mechanical and plasma shockwaves on the structure and properties of superconductors
Authors: Mihailov B P , Alibekov S Ya , Krutskih N A , Egorov A V , Pavlov A I , Lysyannikov A V , Kaizer Yu F , Kuznetsov A V 
Published: July 2020

Abstract
The article presents the results of studying the critical temperature, critical current, and field dependencies of superconducting Bi-2223 and MgB2 multilayer tapes after them being subjected to the influence of shock waves generated at the Plasma Focus test bench and mechanical impacts of various intensities. The influence of the specific energy, the number of impacts, the distance of the samples from the plasma anode, the energy of the falling shock mechanism, and the step of moving the impacts was studied. Studies have shown that the critical current Jc can be increased by 50 % in magnetic fields of 2–3 T. In this case, the grains are crushed, compacted, homogenized, and the impurity content changes. The results of microanalysis of superconducting interlayers in the initial state and after influence of shock-wave of plasma show an improvement in the homogeneity of the distribution of the main components (Mg and B) and impurities (C and O).
Increasing service life and reliability of centrifugal separators by applying new materials
Authors: Khabibullin M Ya 
Published: July 2020

Abstract
This paper analyzes stress-strain behavior and bearing capacity of a rotor in a self-discharging separator, diameter 500 mm, manufactured from parts that underwent a hardening cycle. Three variants of the rotor were studied having the same design but differing in body materials: austenitic steels 06X17H13M3-BД, ALIII-23-43-02 and austenitic-ferritic steel 10X26H5M, ALIII-23-24. Research results allow recommending austenitic-ferritic steel for manufacture of separator rotors, as they provide necessary margin of safety for the design.
Analysis of equipment utilization at random order arrivals and random output
Authors: Korolkova L I , Mashrabov N , Herreinstein A V , Herreinstein E A 
Published: July 2020

Abstract
The aim of this work is to study equipment utilization of an enterprise. To examine the random order arrivals and random output, we use the supply and demand model, in which demand is equipment utilization and supply is product output. There are no restrictions on the type of value, deterministic or random, and on the form of the distribution function of demand and/or supply. The initial data are integer random supply and demand with arbitrary distribution functions. The output parameters of the model are supported and unsupported demand, and unused supply. These parameters are also integer random variables for which the model allows obtaining their functional characteristics. We show that the conventional deterministic approach to calculating the quantity of equipment as a ratio of the average product demand to the average machine capacity leads to both equipment downtime and consumer unsupported demand. We solve this problem for the enterprise manufacturing temperature sensors. When two pieces of equipment are used to produce a certain type of sensors under study, the average unsupported demand is about 12% of the average monthly order and varies from 17 to 112 (non-produced) sensors. Only five months a year the order is fully executed within a month; the equipment is fully utilized for 7–8 months a year. The model allows calculating not only the average values of parameters, but also their distribution functions.
Metering the flow of oil with drag-reducing agents
Authors: Krasnov A N , Prakhova M Yu 
Published: July 2020

Abstract
The bulk of oil and petroleum products is carried by oil and petroleum trunklines. The performance of such transport depends on many factors, including the process parameters (the pipeline diameter, the number of booster stations, and the power of trunkline pumps) and the parameters of the carried medium itself, mainly its viscosity. Most energy it spent to overcome the loss of pressure due to the friction between the fluid layers. These losses increase with the turbulence of the flow. Turbulence can be reduced by drag-reducing agents (DRA) that level off the flow of the fluid. However, this might jeopardize the calibration of the turbine and ultrasonic flow meters. This paper presents experimental research into such flow meters used for metering the flow of oil with and without DRA. The findings suggest that when using a DRA, the flow meters should be calibrated with the DRA, in which case the measurement error will be within the standard-required 0.15%.
Simulation-dynamic model of working time costs calculation for performance of operations on CNC machines
Authors: Kukartsev V V , Boyko A A , Mikhalev A S , Tynchenko V S , Rukosueva A A , Korpacheva L N 
Published: July 2020

Abstract
This article presents a simulation-dynamic model for determining the time spent on machining operations on machines with a numerical control (CNC). The model is developed on the basis of the system dynamics method using Powersim Studio tools. In the shown model, the calculations of the probabilistic deviation of the actual time of technological operations on CNC machines from the technically sound time norm were carried out on the basis of the Gaussian normal distribution law. The model was used as a tool to study the probabilistic distribution of time for equipment retooling and to perform technological operations on HAAS SL-20 CNC machines. The study allows us to conclude that the constructed simulation dynamic model is quite universal and, on its basis, it is possible to carry out a variety of studies concerning various aspects of the technical substantiation of the time norms for performing machining operations on CNC machines.
Methods for monitoring the technical condition of plate heat exchangers
Authors: Mukhametzyanov Z R , Kulakov P A , Rubtsov A V 
Published: July 2020

Abstract
The article sets the task of developing a method for reducing the complexity of repair of plate heat exchangers by optimizing the method of monitoring the technical condition of equipment. To solve this problem, it is proposed to develop a methodology for determining the optimal location of thermoelectric modules. The article presents an algorithm for solving the problem of choosing the location of thermoelectric modules. The developed method allows to evaluate the condition of the plates for deposits, their thickness in real time and on working plate heat-exchange equipment. The data obtained may be used to decide on repair and restoration operations.
Error-control algorithm of voice messages transmission
Authors: Lukyanova E A , Zhigalov K , Salgiriev A , Soltamuradov M 
Published: July 2020

Abstract
High-speed and high-quality communications are required to ensure a smooth process of timely receipt and processing of information. The speed of obtaining information depends on the speed of response and timely management decisions. The development of information and telecommunication technologies has led to an increasing integration of communication and voice messaging systems implementing information processes in the control system. In communication systems where it is important to ensure the integrity, availability and confidentiality of transmitted information when low-bandwidth communication channels are used, voice information is encoded by special compression algorithms. Prefix codes are common in various fields of information technology. Many information compression algorithms are based on them, and they are used by different protocols. The use of run-length coding will reduce the speed of a transmitted signal and increase the throughput.
Theoretical aspects of prototyping
Authors: Orobey M N , Alchinov A , Daudov I M 
Published: July 2020

Abstract
The evolution of programming began at a time when most programs were developed by a single developer. As the complexity of the programs increased, the complexity of their development, debugging and the number of participants in the process also increased, which led to the development of automation systems for programming and organization of teamwork, and later to the development of tools and methods for software design (CASE-tools).
Limit length of long Ethernet telecommunication lines for industrial information systems with centralized structure
Authors: Semenov A B 
Published: July 2020

AbstractPossibilities of application of Fast Ethernet repeaters for extension of the limit length of twisted pair channel of industrial automation systems are considered. A mathematical model of the line with 100 Mb/s performance has been introduced, which allows to perform engineering calculation of the limit length of a single segment and the whole line. It is shown that in the case of Class 1 devices in terms of power consumption in the line, up to three repeaters can be used, one of which is used in the booster mode and must support the PoE+ mode. It has been established that for Class 1 devices, the main means of extending the limit length of the channel is using a twisted pair cable of Category 5e with cores of increased diameter (0.55 mm and more).
Non-destructive testing as an element of monitoring the operational reliability of rice systems for the rational use of water resources
Authors: Solodunov A A , Bandurin M A 
Published: July 2020

Abstract
This article presents the results of monitoring the operational reliability of structures of an on-farm network of rice systems for the rational use of water resources. At present, the state of the water basin of the Kuban River is characterized by a high level of economic and integrated development. The amount of irretrievable withdrawal of water resources in the Lower Kuban exceeds the maximum permissible withdrawal limit by 3.5 times. Thus, the Kuban River has virtually no free water resources in the lower reaches after the Krasnodar reservoir, for further development. Studies conducted on the on-farm network facilities have shown that closed structures on rice systems are in a worse position than open ones. The drainage structure in the form of a pipe was examined in detail, since the structure is exposed and accessible for inspection and measurements. However, part of the structure that was under water during operation got serious damage; the pipeline was destroyed along the entire length from the junction to the water intake well. The use of monitoring the operational reliability of the structures of rice systems has shown the opportunity to improve the quality of the control effects of technical operation, reduce repair costs and obtain the expected economic effect, and also allows to solve the technical problems of long-term operation, classification and determination of damage volumes of the examined structures to improve the calculation of the residual reserve of capacity and establishment the duration of their continued functioning. The use of non-destructive testing methods allows you to scientifically substantiate the costs of maintenance and overhaul, to clarify the rules for operating on-farm network facilities.
Influence of medium composition on biomineralization and morphology of newgrowths
Authors: Strokova V V , Duhanina U N , Balitsky D A 
Published: July 2020

Abstract
The research presents rational (from the point of view of processability) types of bacteria, nutrient media, biochemical agents and their quantities for biogenic mineral formation under specified conditions. The principles of the influence of metabolism processes of microorganisms on the change in the alkalinity of medium are established. The dependences of morphological parameters (size, shape) of mineral components formed during biomineralization in simulated media on the type of nutrient in the crystallization medium are established. The authors formed a phenomenological model of the processes occurring as a result of the bacterial activity of various strains, nutrient components and precursors of crystallization initiation as stages of structure formation during the production of building materials.
Creation of optimal cross-country route using GIS
Authors: Zhigalov K , Gavrilova Zh L , Daudov I M 
Published: July 2020

Abstract
Nowadays the systems for routing are well distributed. However, they all involve routing along existing roads. The article considers the options for the construction of transport routes over cross country, taking into account the technical characteristics of vehicles. The information in this article can be used to solve the problem of the creation of the software designed to develop an optimal route for the movement of technical equipment, taking into account a wide range of features of movement on the ground. In addition, the article discusses possible options for the improvement of modern navigation systems.
Fisheries technology innovation supports the Citarum Harum program
Authors: Haryadi J , Nastiti A S , Krismono  
Published: July 2020

Abstract
Indonesian waters cover about 75% of Indonesian areas and have an abundance of fish resources that must be used carefully and responsibly to maintain its sustainability. Indonesian waters must be considered by authorities and communities to increase fisheries production and habitat quality. One way is by using technological innovation. The Government launched the Citarum Harum Program, as the Government’s attention to the Citarum River. Citarum River has about 11,323 km2 large. The length of the river is about 300 km, starts from Mount Wayang until Java sea. Citarum River dammed into three reservoirs developed for fish culture (Saguling Cirata and Juanda) and industries, domestic, agriculture also animal husbandry along the river. The impact of the river is experiencing pollution. The World Bank responded to this condition and has the intention to improve the water quality of the Citarum river. The Research Institute for Fisheries Resources Enhancement under The Ministry of Marine and Fisheries made efforts to control industrial waste pollution through technologies. The technologies are phytoremediation, culture-based fisheries models (blooming Cyanophyceae, and Eichhornia crassipes with herbivorous/planktivorous fish stock), and KJA Smart. Innovation in fisheries technology is one of the bases for the management of water bodies in support of the Citarum Harum program.
Suitability water quality parameters for seaweed culture at Muara Gembong coastal area, Bekasi District
Authors: Mujiyanto  , Syam A R , Wijaya D , Purnamaningtyas S E 
Published: July 2020

Abstract
Seaweed is one of the vital export aquaculture commodities in West Java of Indonesia. Since 2013, seaweed production in Muara Gembong Sub-District, especially Pantai Mekar Beach and Pantai Sederhana Villages, can be produced 7.000 tons from total 10.000 seaweed culture fisheries of Bekasi District (80%) that was developed with a polyculture system. To ensure the long-term success of providing seaweed production, evaluation of suitable location is an essential step in any aquaculture operation. This study was conducted to analyze suitable sites for seaweed aquaculture in the coastal area of Muara Gembong based on the condition of water quality. Water quality data were collected from 11 stations during field surveys in March, July, and October 2018. Water quality parameters were observed with physical parameters (Secchi disk transparency, temperature, and depth) and chemical parameters (salinity, pH, DO, phosphate, and nitrate). Evaluation of water quality data included compile of matrix suitability design through some works of literature. The suitability coastal areas were analyzed to get suitable location used GIS software from coordinate data and water quality parameters, which were compared. The class “suitable” has a score of 4, the “suitable enough” class has a score of 3, the “suitable with conditionals” class has a score of 2, and the class “not suitable” has a score of 1. Based on the measurement result, the “suitable” areas were Station 7 (Front of Muara Mati), Station 8 (Outermost Muara Mati), Station 11 (Muara Kuntul), and Station 12 (Front of Muara Kuntul). The coverage area that was in a suitable area category is 962.72 Ha (9.63 km2). The location also linear with the result based on salinity, DO, and transparency (Secchi dish transparency). There are selected locations compared with other stations in Muara Gembong coastal waters because those locations face waste problems from Citarum Watershed and Jakarta Bay. Also, the sites serve as a source of livelihood for the community.
Potential development of fairy shrimp Streptocephalus spp. as aquaculture live feed in Indonesia
Authors: Pratama I , Albasri H , Abinawanto  
Published: July 2020

Abstract
The use of fairy shrimp (Streptocephalus spp.) as a live feed for aquaculture is not well-known in Indonesia. On top of that, fairy shrimp mostly portrayed incorrectly in Indonesia as an unwanted creature and should be prevented in fish ponds. This review highlights the importance of fairy shrimp Streptocephalus spp. as an alternative live feed as well as explore the potential application and suitability for its future implementation in Indonesian aquaculture industry.
The effect of limb-removing and placement-depth on the growth rate of mud crab juvenile, Scylla tranquebarica
Authors: Gunarto  , Sulaeman  , Herlinah  
Published: July 2020

Abstract
Mud crabs, Scylla tranquebarica cultured in brackishwater ponds need three to four months to achieve marketable size. However, rapid movement and cannibalism seemed to be responsible for causing low survival rate of mud crabs. Therefore, a rearing system that can control movement and cannibalism in the crab’s grow-out system is needed. The purpose of the study was to evaluate the growth performance of mud crabs with limb-removing and non-limb- removing were grown in plastic boxes and placed in the different water depths. Two factors were tested namely, first factor is mud crabs with limb-removing, which consists of two levels, A1). All limbs were not removed and A2). All limbs were removed except for swimming legs. The second factor is placement-depths for the crabs growth in brackishwater ponds which have three levels, namely, B1). 0 cm, B2). 35 cm and B3). 70 cm under surface of pond waters. The crabs with mean weight 88.99±5.895 g were tested in each treatment with three replications. The crabs were fed with chopped trasfish at 5% of total weight−day. The experiment lasted after 42 days. The molt crabs were observed daily and the crab growth was monitored every week by measuring their weight. The final weight, weight gain, and specific growth rate were compared among treatments tested. The water quality in the pond, (temperature, salinity, dissolved oxygen, and pH) were also observed. The results showed that 100% of crabs with removed their limb (A2) were molting, while crabs with unremoved their limb (A1) 44.44% were molt. The highest weight gain obtained in A1B3 (61.61 g/ind.) from crabs unremove their limb and placed at a depth of 70 cm under water surface and showed a significant difference (P<0.05) with A1B1 (the crab unremoved their limb and placed on the water surface with weight gain is 9.6g/ind. However, limb-removing and the interaction between limb-removing and placement-depths were not significantly different (P>0.05). The range of water quality such as salinity (17-25 ppt), dissolved oxygen (2.71-8.51 mg/L), water temperature (28.5-31.5°C), and pH (7.5-8.5) in this study are still within the tolerance limit for crab juvenile growth. The unremoved limb crabs and growth at 70 cm as the better alternative to eliminates violation of animal ethics by removing the limb crab.
Activity Budgets, Energy Expenditures, and Energy Intakes of Nesting Ferruginous Hawks
Authors: Wakeley James S. 
Published: July 2020

Abstract
Daily energy expenditures of two pairs of nesting Ferruginous Hawks were estimated from activity budgets, and were compared with energy intakes determined from observed prey captures. In 1974 and 1975 respectively, the adult males expended 330.9 ± 37.8 (SD) and 374.3 ± 18.1 kcal/day, whereas the adult females expended 265.3 ± 28.3 and 294.6 ± 34.5 kcal/day. The total daily energy expenditures of adults and young (approximately 995.8 and 967.1 kcal/day in 1974 and 1975, respectively) were more than balanced by their gross intakes (1,337.8 ± 308.2 and 1,393.2 ± 236.7 kcal/day, respectively). The adult males had foraging efficiencies (kcal gathered/kcal expended in hunting) estimated at 7.56 ± 2.17 in the first year and 7.31 ± 1.80 in the second. Estimates of energy intake and foraging efficiency are maxima due to the likely under-representation of small prey items in regurgitated pellets.