bluuebunny/crossref_metadata_2025_split huggingface dataset:
Computational simulation of damage accumulation processes in cracked bodies by the UMAT procedure of SIMULIA Abaqus
Authors: Stepanova L 
Published: November 2019

Abstract
The paper presents the experience of using the user subroutine UMAT for finite element package SIMULIA Abaqus/CAE for damage accumulation processes in the vicinity of the crack. A continuum damage mechanics model based on the constitutive relations of linear elastic isotropic materials with the incorporated damage tensor components is used to describe the material behavior. The material nonlinearity arising from the deformation process is modeled by introducing an anisotropic damage tensor of the second rank into the constitutive equation. The material model is described by means of user procedure UMAT of SIMULIA Abaqus. The finite element (FE) mechanical constitutive model is implemented in Abaqus/Standard via a UMAT routine. Numerical experiments for a large series of cracked specimens have been performed. Computed stress and damage tensor components were found. It is shown that they are not dependent on the FE mesh refinement. Distributions of the damage tensor components in the vicinity of the crack tip in cracked specimens of different configurations under mixed mode loading in a wide range of mixed mode loadings are found. The configurations of active damage accumulation process zone in the cracked specimens are obtained. It is shown that the damage accumulation process has substantial influence on the stress-strain state in the vicinity of the crack tip and leads to decrease of the stress concentration in cracked specimens.
Steady state numerical calculation of the melt-pool shape
Authors: Avdeev E V 
Published: November 2019

Abstract
A two-dimensional steady-state melting problem is numerically simulated. This task arose during the Selective laser melting (SLM) additive process technology modeling project. The initial problem is the formation of residual stresses and, as a consequence, the appearance of accumulated deformations (inherent strains) and distortion of final production shape. As the solution of this initial problem suggested the development of its own appropriate software tool. The development process was divided into 5 stages. Stage 1 is to model the geometric size of the molten bath. A comparison of the results obtained within OpenFOAM (laserConvBC) and results from a similar article.
Study of the separation processes of gases in the microchannel based on the stochastic simulation
Authors: Potienko K I , Agafonov A N 
Published: November 2019

Abstract
One of the main problems in the development of microfluidic gas chromatography columns is the complexity of the preliminary modelling of the microfluidic systems, namely, the complex modelling of physicochemical processes on the inner surface of the microchannel walls and the simulation of carrier gas movement. The purpose of this work is to develop an integrated computer model for the separation of sample gas components in a gas chromatographic column that takes into account the effect of the carrier gas on the gas- sample particles and adsorption processes in the surface layer. The proposed model is based on stochastic method. The simulation results can be used to improve the development of microfluidic gas chromatography columns and other devices in which the separation of gas mixtures occurs.
Calculation of residual stresses in plasma spray coatings taking into account the build-up process
Authors: Bogdanovich V I , Giorbelidze M G 
Published: November 2019

Abstract
Methods of calculation of residual stresses in plasma coatings considering extension process for different cases of substrate attachment that are the most common in deposition practice have been developed. According to the developed methods, analytical calculations and experimental research of residual stresses for the coating composed of 70% Al+30% BN have been done.
Construction of the mathematical model of a catalytic reaction by means of a perceptron with one hidden layer
Authors: Almakaev R R , Koledin S N 
Published: November 2019

Abstract
Mathematical models for the homogeneous catalytic reaction between alcohols and dimethyl carbonate were developed using the least-squares method, a perceptron with one hidden layer, and the law of mass action. The structure of a trainable neural network is presented. The relative deviation error between the calculated and experimental values is minimum when the perceptron model with one hidden layer is used.
Digital Transformation Legacy Social Service Information System
Authors: Popov S B , Khripunov P V 
Published: November 2019

Abstract
The article considers the methodological aspects of the digital transformation of legacy social service information systems. The result of this transformation is the social service digital platform that ensure the use of new innovative technologies for processing and analysing big data, machine learning and artificial intelligence. The base of this transformation is cloud computing; big data technology; microservice architecture with container-based software development technology. We propose a person digital profile as a basis of data management in the social service digital platform. The proposed one is based on a new abstraction level of software stack – dataware. The implementation uses a microservice architecture and a container-based software development technology in according to the Data-as-a-Service concept.
System approach to identification of geopulses
Authors: Gapeev M I , Senkevich Yu I , Lukovenkova O O , Solodchuk A A 
Published: November 2019

Abstract
A new system approach to the identification and systematization of geophysical pulses is described. It includes stages of detection, analysis, object and structural description, pulse classification. In order to identify the pulses in geoacoustic emission, we apply a method based on the calculation of adaptive threshold, the values of which are estimated by the results of signal root-mean-square deviation in a moving window of a defined size. The detected pulses are described and identified by an adaptive matching pursuit algorithm which allows us to decompose the pulse into linear combination of basic functions from a combined Gauss-Berlage dictionary with minimum spatial and time costs and with the required accuracy of constructed approximations. Within the framework of object approach, pulses are described by a combination of features such as the number of functions in a decomposition, function type, parameters etc. We present a method of reduction of innumerable diversity of identified pulses to a denumerable set of patterns. It is based on structural transformation of geoacoustic emission pulses with simultaneous automatic procedure of classification. The results obtained during the application of the described system approach to the analysis of geoacoustic signals are summarized in a Geophysical Signal Catalogue.
Use of a vertebra digital model for an implant design
Authors: Abulkhanov S R , Surkov O S 
Published: November 2019

Abstract
In this paper, we consider some possible design options for the reconstruction of an injured vertebra based on the local information on its surface before the injury. We used the methods of guaranteed identification for the reconstruction of the vertebra surface. Using the vertebra surface model, we have developed designs of anatomically shaped vertebra implants. In this case, the vertebral implant has a foramen vertebrale. Therefore, we have designed a split-type implant. To ensure the stiffness of the implant assembly, we have considered two fastening options for implant structural components: the dovetail groove mounting and fastening with asymmetric surfaces. Taking into account the existing best practices in medicine and in order to fasten implant structural components, we have selected options for connecting the components by means of asymmetric surfaces and with fasteners. In our opinion, the considered fastening options for vertebral implant components can be used in the replacement of other bones. When designing an atomically shaped vertebral implant, we selected a structure that weighed as close to a natural vertebra as possible. We also designed the structure to maximize its load-carrying capacity. We suggest to produce implants from blocks of allogenic osteoplastic material. This will enable implant components to be set properly and not to be rejected by the immune system.
Fano approximation for coupled modes in metal-dielectric multilayer structures
Authors: Nesterenko D V 
Published: November 2019

Abstract
We study the response of coupled modes in metal-dielectric multilayer planar structures consisting of a metal layer attached to a high-index waveguide by a low-index spacer layer. The structure supports excitation and coupling of a surface plasmon polariton mode and a waveguide mode. A coupled-mode model is developed to analyse the field transfer processes and describe the appearance of Fano resonances as a result of the modes interaction. It is demonstrated that the response of the plasmonic mode can be well fitted to a Fano function that allows extraction of width, height, sensitivity, and field enhancement.
Research Inside a Gas Heating Device with Different Heat Transfer Medium
Authors: Guo Yun , Zhou Zhongwei , Chen Hao , Ouyang Yeyu , Huang Zhiqiang 
Published: November 2019

Abstract
Natural gas heating device occupies an important position in natural gas industry, and the most widely used one is the cylindrical heating device with heat transfer medium. The key factors affecting the thermal efficiency of the cylinder gas heating device with heat transfer medium are the type of heat transfer medium and the flow field organization. In order to study the influencing factors of thermal efficiency of the heating device, a visualized practical gas heating device experiment system was established, and a two-dimensional heat transfer model fitting the real object was established, too. The unstructured fitting mesh was used to divide the physical model, and the finite volume method was used for discrete solution, while discrete coordinate (DO) radiation model is used to solve radiation equation. In this paper, water and ethylene glycol are used as heat transfer media to simulate and measure the heat flow field in the cylinder. The results show that ethylene glycol can broaden the application range of gas heating device. Under the same experimental conditions, the heat efficiency of the heating device with ethylene glycol as heat transfer medium is at least 3.8% higher than that of the heating device with water as heat heat transfer medium. The thermal efficiency of gas heating devices is generally less than 87%.
Investigation of the features of polyolefins and wood biomass thermochemical conversion for their energy utilization
Authors: Donskoy I G , Shamanskiy V A , Kozlov A N , Penzik M V , Kozlova M A 
Published: November 2019

Abstract
Combustion of solid combustible wastes is the most common way of their disposal. In developed European countries, up to 50% of all municipal waste is burned; in Russia, it is estimated to be less than 2.5%. The efficiency of modern thermal plants operating on MSW and biomass, as well as the capacity of individual combustion units are continuously increasing, approaching the average values that are close to fossil fuels plants. Replacing coal with combustible waste will make it possible to reduce the cost of energy production and reduce the load on waste landfills. However, to this end, it is necessary to solve the problems of organizing efficient combustion as well as cleaning of combustion products. Of particular interest is the co-processing of municipal waste along with lignocellulosic waste from agriculture and the forest industry. In the present work, the thermal behavior of woody biomass and polyethylene mixtures (in different mass ratios) when heated in an oxidizing environment is investigated using methods of thermal analysis. The distribution of the products of pyrolysis and oxidation is investigated by means of mass spectrometry.
Flow and heat transfer of fluid in a pulsating heat pipe
Authors: Sharma Megha , Singh Sikarwar Basant 
Published: November 2019

Abstract
Cooling of electronic components are preferred heat pipes imbedded in heat sink because of high heat transfer through them. The oscillating motion of the working fluid due to continual phase change facilitates both sensible and latent heat transfer in pulsating heat pipes. This enables transfer of high heat flux efficiently over long distances. In this work, a mathematical model is developed to optimize the parameters which involves in heat pipe design. The parameters are filling ratio, size of tubes and degree of temperature. In House Finite Volume based CFD solver is used for simulation. The obtained simulation results are validated against experimental results present in literature. These results are useful for understanding thermos-hydrodynamics of pulsating heat pipe for achieving maximum thermal performance
Moist Air Condensation on Inclined Hydrophobic Metallic Surfaces: Simulation & Experiments
Authors: Baghel Vishakha , Singh Sikarwar Basant 
Published: November 2019

Abstract
Atmospheric Water Generators (AWGs) are popularly used for harvesting portable water from atmospheric air of hot, humid and arid regions of the world. Hydrophobic metallic surfaces are preferred in AWGs systems because condensation of moist air on/underneath these surfaces have high efficacy. There are several issues to fabricate hydrophobicity on metallic surfaces. Although with the advent of Nanotechnology and thin film coating technologies, the fabrication of hydrophobicity on metallic surfaces has become easier and realizable in the recent era. In this manuscript, a comprehensive mathematical model is developed for simulating the moist air condensation in the form of droplets on various substrates and in different environmental conditions. The experiment is carried out for validation of the present model. Post validation, the effect of surface hydrophobicity, relative humidity and degree of sub-cooling on the condensation rate are addressed. The simulation results show that vertically orientated metallic surfaces having a high contact angle along with low contact angle hysteresis are efficient for condensing unit. Larger condensation rates are observed at higher relative humidity and a high degree of sub-cooling. This research is helpful for designing efficient and effective AWGs for the hot and humid region.
Numerical study of combustion of the diesel fuel sprayed with a steam jet in a prospective burner device
Authors: Krasinsky D V , Tsepenok A I 
Published: November 2019

Abstract
A prospective laboratory-scale burner device that employs a concept of liquid fuel spraying in the high-speed superheated steam jet is considered. The presented work is devoted to numerical study of aerothermochemical processes occurring in this novel-design burner during the combustion of diesel fuel sprayed with axial jet of water steam. The mathematical model is based on Euler-Lagrange approach for two-phase turbulent reacting flow description applied in 2D axisymmetric steady-state formulation. The vaporized diesel fuel combustion is described via EDC model with chemical kinetics mechanism for n-heptane (30 species, 66 reactions). The two-step soot model is also used, as well as NOx prediction at post-processing stage. The fields of velocity, temperature, heat fluxes, gas species and disperse phase concentrations, including soot and NOx, have been obtained from numerical simulation for a typical operational mode with diesel supply rate of 1.2 kg/hour and water steam flowrate of 0.8 kg/hour. Analysis of these flowfield data has allowed to reveal the two-layer coaxial structure of reacting flow (consisting of relatively cold near-axis jet layer and the coaxial layer formed by the hot recirculation zone) inside the burner.
Two-phase compact heat exchangers: a review and future applications for high heat flux removal
Authors: Kuznetsov V V , Shamirzaev A S 
Published: November 2019

Abstract
The compact flow heat exchangers are important components of the equipment for power generation, chemical processing, and thermal environment control. This paper presents the flow pattern characterization and heat transfer performance for two-phase compact and ultra-compact heat exchangers. The scaling analysis is presented in this paper to identify the effect of various forces. The heat transfer enhancement mechanisms during flow boiling and condensation in compact heat exchangers are discussed using experimental data for refrigerant R-21. The mechanisms of subcooled and saturated flow boiling in ultra-compact heat exchangers based on microchannels are discussed using experimental data obtained for water.
Heating and cooling of a battery pack of a solar electric car
Authors: Kasatkin Ivan , Egorov Mikle , Zakhlebaev Evgeny , Kotov Evgeny 
Published: November 2019

AbstractThe purpose of the research is to analyse forced air cooling of a solar electric vehicle battery. Due to the conditions of safe battery performance, it is obligatory to keep its temperature under 45°C, so cooling should be provided. The battery pack is assembled of 420 battery cells with square pitch. At normal operating conditions of the solar car a forced air cooling thermal calculation is performed. Hydraulic calculation is carried out. The air pressure loss magnitude is calculated. A comparison of the geometric parameters of the corridor beam is presented. Based on a steady-state heat transfer analysis and hydraulic calculation, suitable airflow parameters and battery pack layout are selected.
Heat and mass transfer in the boundary layer during evaporation of aqueous solutions of ethanol and acetone into air and superheated vapor components of solutions
Authors: Makarov M S , Makarova S N 
Published: November 2019

Abstract
A stationary flow of three-component gas in a laminar boundary layer on a flat plate is considered at adiabatic evaporation of a two-component liquid film. Numerical modelling were carried out at atmospheric pressure, air flow velocity of 2 m/s and temperature from 20 to 500 °C in the whole range of concentrations of a low-boiling component of binary solutions: ethanol/water, acetone/water, and acetone/ethanol. Data on the local specific evaporation rate of ethanol/water and acetone/water solutions into dry air and superheated mixture of ethanol, acetone and water vapors were obtained depending on the temperature of the inlet flow. Composition of superheated vapor mixture was taken to be equilibrium relative to the liquid solution. With an increase in the molar fraction of ethanol or acetone in the water solution, the evaporation rate increases, and when evaporated into superheated vapor, the growth of evaporation rate with increasing vapor temperature is significantly higher than at evaporation into air. With an increase in ethanol or acetone concentration in the liquid solution, the inversion temperature decreases from down to 155…165°C.
Numerical simulation of flow with evaporation in triangular grooves
Authors: Sibiryakov N , Kabov O 
Published: November 2019

Abstract
We study the flow of an evaporating liquid film in triangular open microchannel. Above the surface of the liquid flows a gas. The sear-stress on the gas-liquid surface drags the liquid and removes the vapor. It models either flow in a channel or a flow in a single groove. The novelty of this work is that we simulate gas-driven flow with evaporation. We use Boundary element method to solve Laplace equation with mixed boundary conditions. This method gives the normal derivative of vapor concentration at the surface of the liquid. The resulting evaporation flux is growing sharply near the contact line. Integral evaporation coefficient slightly depends on the depth of the liquid. The upper gas flow drives the liquid film, resisting a velocity drop and preventing the dry spot formation.
Energy conservation and the use of the heat of refrigeration of ice arenas to heat the school of figure skating of St. Petersburg
Authors: Kondrashov A. , Egorov M. 
Published: November 2019

Abstract
A variant has been proposed for using the system for utilizing the heat of condensation of heat engines, most of which has not been used and released into the environment, for air heating of ice arenas. An analysis of unused heat energy was made using the example of a refrigerating machine, which, in addition to cold production, also produces a significant amount of heat that is generated during the compression of the refrigerant in the compressor to the pressure and condensation temperature, and in most of the existing refrigeration units, thermal energy is not used and transferred to the environment using air condensers or cooling towers located on the street. The analysis of the economic efficiency of the use of heat recovery systems, for various technical needs. A study was carried out on the actual implementation of the system of partial utilization of the condensation heat of refrigerating machines, which is aimed at air heating of ice arenas at the St. Petersburg State Budgetary Institution of the specialized school of Olympic reserve on figure skating (hereinafter referred to as the “Institution”).
Effect of the armed conflict in Santander North 1990-2012 an impact measurement
Authors: Zambrano Miranda M D J , López D J Manzano , Sánchez A Botello , Pinzón Solano C H , Alvarez M Pontón 
Published: November 2019

Abstract
The armed conflict in Colombia has been a scourge that has disrupted all social dimensions of the country, provoking a humanitarian drama and a high economic cost that has been lived for decades. The purpose of this article is to estimate the effects of the armed conflict on economic growth in Norte de Santander, Colombia in the period 1990-2012; the conceptual framework is the solow-swan model of economic growth and the methodology is to determine the impact of the armed conflict on the growth behavior of the gross domestic product of the Nation and the department of Norte de Santander. Using the synthetic pairing methodology method, it is possible to estimate the impact in contexts in which an aggregate unit (such as a country or department) is being treated or exposed to an intervention. The results show that if there had been no armed conflict, Norte de Santander department would have had a better economic performance. The present article has a sequence after this brief introduction, a state of the art, followed by a methodological explanation, the results and finally some general conclusions.
Mathematical model of the firing process in Ladrillera Ocaña, Colombia
Authors: Nolasco C , Gurrero Gómez Jácome G , Gómez Campero J A 
Published: November 2019

Abstract
The process of heat transfer by conduction is relevant in different context of engineering. Quantify temperature is very important in energy efficiency of firing process. The aim of this work is to establish a mathematical model to determine the firing process at the burner door of the Hoffman kiln of Ladrillera Ocaña, Colombia. For the data acquisition, a virtual instrument was designed for the temperature data collection system. The analytical solution proposed for the model presents a high degree of difficulty. As an alternative, two solution schemes are proposed using numerical methods that are very close to the theoretical model.