bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of partial magnetic field on thermo gravitational convection in an inclined cavity
Authors: Chatterjee Deep , Manna Nirmal K. , Mandal Dipak Kumar , Biswas Nirmalendu 
Published: February 2021

Abstract
The study presented gives a succinct overview of the effect of partially applied magnetic field on natural convective heat transfer in a differentially heated inclined cavity. The left and right sidewalls are differentially heated such that their temperatures are maintained (at T

h
and T

c
respectively), while the top and bottom walls have been assumed to be adiabatic, such that heat transfer through those walls can be neglected. The results are supposed to elucidate the effect of changing Rayleigh number (Ra), Hartmann number (Ha), and cavity inclination angle (f ) on the thermo-fluid phenomena. The analysis is carried out numerically utilizing finite volume based computing code. The results have been demonstrated in the form of streamlines, isotherms, and average Nusselt number. From the analysis, it is found that the flow structure and associated heat transfer characteristics are severely influenced by the studied range of governing parameters.
THERMODYNAMIC ANALYSIS OF DOWNDRAFT BIOMASS GASIFIER TO STUDY THE EFFECT OF TEMPERATURE USING DIFFERENT FEEDSTOCK
Authors: Das Sampad Kumar , Roy P. C. 
Published: February 2021

Abstract
In the present paper, effect of gasification temperature on gasification process in a downdraft gasifier using different biomass feedstock has been examined. An equilibrium model of the downdraft biomass gasifier has been developed to carry out the study. The model has been validated with experimental results. The producer gas yield has been analysed by using stoichiometric equilibrium model. The lower heating value (LHV) calculation has been done for different biomass with respect to temperature. It has been observed that the hydrogen production rate and CO production rate increases with respect to increase in temperature. On the other hand the Methane production decreases with increase in temperature. The lower heating value (LHV) for the studied sample has been observed to decrease with respect to the increase in gasification temperature.
Analysis of nanofluid based natural convection in a square cavity applying corner heating and cooling
Authors: Saha Abhinav , Ghosh Koushik , Manna Nirmal K. 
Published: February 2021

Abstract
The present investigation aims at the numerical analysis of natural convection in a square cavity. The cavity is filled with nanofluid using water as the base fluid and Al2O3 as nanoparticles. The investigation is carried out in a square cavity with corner heating and cooling. The numerical simulations are performed using a finite volume method. The average Nusselt number is calculated for a wide range of Rayleigh number from 104 to 106 keeping solid volume fraction of nanoparticle fixed at 0.04. The details of flow and heat transfer for various cases are analyzed using the contour of streamlines and isotherms.
Optimum Load in Vickers Microhardness Testing of Treated Magnesium Alloy by Thermal Oxidation
Authors: Lutiyatmi  , Sutiyoko  , Afandi Ridwan 
Published: February 2021

Abstract
Magnesium and its alloy have good properties as biomedical implant such as biodegradable material and excellent biocompatibility. Their hardness is an important mechanical property in using of these materials. Vickers microhardness is one of hardness testing methods in metal materials especially for thin layer on the metal. Mass of microhardness testing load also has important effect on result validity. The object of this research is to investigate optimum load in Vickers microhardness testing of magnesium alloy treated by thermal oxidation. Magnesium alloy AZ61 was treated by annealing at 150; 225; 300; 375; 450 °C of temperature. Vickers microhardness testing was carried out on this treated material using 5, 10, 25, 50, and 100 g of load. Five data for both each load and temperature, therefore there are 25 data for each load. Optimum load is determined the load which has lowest standard deviation in Vickers microhardness. The optimum load in this research was happened at 10 g in load of Vickers microhardness testing. The Vickers microhardness in this load was 36.0 g.mm-2 and the standard deviation was 2.7 g.mm-2.
Features of art and design schools on the example of the southern Federal and Riga technical universities
Authors: Mokina A Y , Mokina A Yu , Andra Ulme 
Published: February 2021

Abstract
The article examines the issues of modern pedagogical science in the field of art and design activities on the example of universities in Russia and Latvia. A comparative analysis of approaches to the formation of creative skills for students while working on creative projects in the field of design, decorative and applied arts is performed. The main criteria for evaluating the final students’ results when working on art and design projects are also identified, as far as these criteria are similar or different depending on the region, province and countries where educational activities are conducted to prepare the designers and artists of decorative and applied arts. The novelty of this research is the choice of art and design areas for training specialists and a comparative analysis of two schools design methodology: in Latvia and Russia. The results are the analysis tasks of the research problem, namely, how different the students creative process is depending on the region or not stand out at all, if the teachers‘ criteria in grading art projects of future specialists are different, whether the quality of the students‘ professional training in the field of artistic and design activities differs in Latvia and Russia on the example of two Universities: Riga Technical University and Southern Federal University.
Three-layer composite panel with discrete layer and bionic principles
Authors: Mayatskaya I A , Yazyev B M , Eremin V D 
Published: February 2021

Abstract
A very interesting direction in bionics, which uses the properties of natural, complex in design structures. The purpose of these studies is to increase strength, thermal insulation and sound insulation by changing the shape and thickness of the intermediate layer and using composite materials in a lamellar structure.
The individual components‘ influence on aging of bitumen mineral materials
Authors: Salikhov M G , Veyukov E V , Vainshtein V M , Malianova L I 
Published: February 2021

Abstract
When heating bitumen-mineral mixtures at high temperatures under the air access conditions, their accelerated aging is observed, i.e. the values and quality indicators‘ decrease of the compacted samples from them. Due to the different structure of bitumen films on the mineral components‘ surfaces of different compositions and sizes, aging processes may occur in different ways. In this regard, a need for a differentiated study of the aging process on the surfaces of large fine aggregates and the crushed part of the bitumen-mineral (asphalt concrete) mixture arose. The experiments in laboratory conditions are carried out according to the Volga State Technological University developed at the Department of Construction Technologies and Automobiles (according to RF patent No. 2654954). The aging processes analysis of the samples from bitumen-mineral mixtures is carried out using the dimensionless aging coefficient in terms of the ultimate compressive strength at +50 °C. The nature and dynamics of the samples‘ aging over time are assessed using special indicators - the aging coefficient and the aging intensity. As a result of the experimental study, the optimal ratios of bitumen with mineral components, taking into account their susceptibility to aging over time, were established. The changes‘ dynamics in the bitumen aging intensity in time in the bitumen-mineral mixture as a whole and separately on the mineral components‘ surfaces separately has been studied. The results of this study can be taken into account when revising the standard service life values of the roads with structural layers of bitumen-mineral materials.
Investigation of the technological factors‘ influence on the formation of the repair compositions‘ properties
Authors: Serebryanaya I A , Shlyakhova E A , Egorochkina I O , Serdyukova A V , Sarkisyan R G 
Published: February 2021

Abstract
Power transmission lines (PTL) belong to strategic facilities, on the reliability of which the life support of the country depends. Most of the currently operated PTLs were put into operation in the twentieth century, and now there is a problem of assessing their technical condition, repairing, if necessary, and maintaining them in working order. The defects appeared during the operation of PTL reinforced concrete elements have different localization and manifestation degree, but destruction of the concrete surface layer with reinforcement exposure is a characteristic, more often at the base of the PTL frame. The aim of the work is to select the optimal composition of the repair mortar based on non-shrinking and expanding cements, ensuring reliable adhesion of the repair mortar to the concrete of the structure, which will allow restoring the bearing and operational characteristics in the repaired PTL reinforced concrete elements at the design level.
Technologies for creating directional orientation of fiber reinforcement in concrete
Authors: Mailyan L R , Shilov P A , Shilov A A 
Published: February 2021

Abstract
Information on the analysis of methods for creating directional orientation of steel fiber rodding of reinforced concrete structures is presented. The design of a mobile experimental setup for the manufacture of fiber-concrete and fiber-reinforced concrete linear elements with a directional orientation of steel fibers by mechanical means has been developed. The test results of the pilot plant are presented. The required dimensions of the bunker for the fiber-reinforced concrete mixture, the type of the leveling element and the method of increasing the fiber-reinforced concrete mobility during casing using a pilot unit have been determined. The creation of a directed orientation of fiber threads in fiber-reinforced concrete makes it possible to make the most of this material‘s advantages. Despite a sufficient number of theoretically possible ways to create a directional orientation of fibers in a concrete mixture, not all of them can be applied in real construction conditions. Also, a number of methods introduce additional difficulties into the concreting process, which can adversely affect the construction processes duration. The use of a mechanical method for creating a directional orientation of steel fiber reinforcement in concrete made it possible to obtain the desired result on a mixture already containing fiber threads, without the need for their separate laying. The optimal design of the mechanical element leveling and the features of the process of leveling steel fibers in concrete have been established.
Destruction of polymers under the action of laser radiation
Authors: Kunizhev B I , Torshkhoeva Z S , Zhelikhazhev R N , Starov A V 
Published: February 2021

Abstract
Laser ablation is one of the main mechanisms of polymers destruction under the action of laser radiation. In this paper, the basic information on laser ablation of polymers is presented. Under the action of laser radiation on the polymer, processes of thermal, thermo-oxidative, and mechanical degradation occur simultaneously, resulting in the evaporation of macromolecules fragments (up to oligomers), and in some cases, separation of polymer particles and filler by a gas or plasma jet is observed. In addition, a substance ablation is accompanied by a large number of concomitant effects: vapor condensation and liquid phase dispersion.
Free oscillations of a beam with installation (1st part)
Authors: Kulterbaev Kh P , Vodakhova V A , Baragunova L A , Shogenova M M , Tsipinova A Kh 
Published: February 2021

Abstract
The transverse oscillations of a beam carrying a discrete mass in a span are studied. The mathematical model of oscillations is presented as a boundary value problem from the main partial differential equation of the fourth order hyperbolic type in the spatial coordinate, of the second order in time, the boundary conditions and the conditions for the sections‘ conjugation. The technical theory of the rods bending oscillations, based on Bernoulli‘s hypothesis, is used. The spectral problem of determining the eigenvalues and eigenmodes of oscillations (the Sturm-Liouville problem), necessary for analyzing the problems of forced oscillations, is considered. It is argued that the solution by analytical methods is impractical due to the large volume of transformations and cumbersome calculations. Methods of separation of variables and finite differences are used. An algorithm for solving the problem, implemented in the Matlab software environment in the form of high-precision graphic-analytical calculations, is developed. The conclusions for practical applications of the results are made.
Methodological foundations for the system analysis principles application for modeling the phenomena of heat transfer in the technological cleaning process of tanks for oil products
Authors: Fedosov S V , Azovtsev A G , Syrbu S A 
Published: February 2021

Abstract
The article is devoted to the determination of the methodological foundations for the application of the system analysis principles for modeling the phenomena of heat transfer in the technological cleaning process of tanks for oil products. The article deals with the spontaneous combustion problem of pyrophoric deposits in oil and gas industry and a method for solving it using the principles of system analysis. The process of spontaneous combustion of pyrophoric deposits has several stages, therefore, decomposition of this process and further analysis of its structure are relevant. On the basis of a system analysis, the process stages of the pyrophoric deposits‘ spontaneous combustion have been determined and general and specific tasks have been formulated.
Modern architectural - planning, organizational, technological, constructive solutions at green roofing
Authors: Seferyan L A , Chubarov V E , Chubarova K V 
Published: February 2021

Abstract
The article discusses one of the most urgent problems of Russian cities - the lack of green areas in urban environment. In urbanization process with the growth of large cities and an increase in the population, the ecological state of the environment is transformed, and the concepts of “dwelling - environment” are also changed. One of the effective and rational steps towards solving the problem of the lack of green areas in Russian cities is the green roofs use. At the moment, there is a certain typology, as well as many different design solutions using modern building materials for the organization of green roofs. The article analyzes the advantages and disadvantages of roof gardening in detail, also considers the existing regulatory and legal framework governing their structure. Describes the functions of normative documentation on green roofs at all building life cycle stages.
Road incidents detecting
Authors: Feizullaev A R 
Published: February 2021

Abstract
Timely detection of traffic incidents largely determines the traffic management algorithms‘ effectiveness. To date, an accurate method for detecting road incidents has not been developed. As a result, different approaches to determine the incidents‘ duration are used. This paper observers currently available approaches to identifying road incidents and suggests dividing incidents into four stages: detection time, reaction time, clearance time and recovery time. Determining the impact degree of various factors on the incident duration is important for designing an efficient traffic management algorithm under incident conditions. Four-stage split can be used for developing an algorithm minimizing the incident duration as well as the time needed for road traffic recovering. The article presents the results of traffic flows‘ modelling, which makes it possible to estimate the road incidents‘ detection time as well.
Some aspects of the bridges‘ functional qualities restoration
Authors: Makarov A V , Kalinovsky S A , Ereshchenko T V , Pavlova M A 
Published: February 2021

Abstract
The paper considers the reasons for reducing the load-bearing capacity of bridge structures. Factors affecting the feasibility of major bridge repairs are identified and some ways of their implementation are analyzed. An improvement of one of the modern methods of repairing bridge beams – pasting them with carbon lamellas is proposed. The improvement essence is the use of a device for tensioning reinforcing belts and the proposal to use carbon fiber lamellas as puffs, similar to Sprengel puffs. The method consists in stretching the lamella along the lower edge of the beam edge and fixing it using the developed anchor, not by gluing.
Evolution of loading paths in a heterogeneous soil mass during the foundation pits’ construction
Authors: Ter-Martirosyan Z G , Ter-Martirosyan A Z , Vanina Yu V 
Published: February 2021

Abstract
This article shows the construction of loading paths for the soil mass points using the example of a phased construction of the subway structure underground part. The solution to the problem was obtained by the finite element method using a PC PLAXIS 2D. The graphs of changes in the points’ stress state in coordinates p’/q are shown.
On the question of increasing the purification efficiency of flue gases from the boiler unit of HEPS Volzhsky automobile plant
Authors: Balandina O A , Puring S M , Vatuzov D N , Filatova E B 
Published: February 2021

Abstract
The paper considers the measures to suppress emissions of nitrogen and carbon oxides emitted during natural gas combustion, used on the VAZ heat electro-power station territory in Togliatti. The analysis of the quantitative distribution of fuel consumption and pollutant emissions for 2015 - 2019 has been carried out. The description of the process flow diagram of the gas-air duct of the TGME-464 boiler unit (KA No.12) is presented. The possibility of using the method of selective catalytic reduction of nitrogen and carbon oxides on the honeycomb ceramic catalyst surface is considered. The graphical dependences of the volumetric-mass air flow rates, flue gas fuel, specific flow and speed energy on the change in the heat load of the boiler unit are determined. The possibility of using a mathematical model for calculating the change in concentrations and along the length of the catalytic layer depending on the flue gas flow temperature is considered.
Automated monitoring systems for defects and damages of building structures and materials
Authors: Evtushenko S I , Lepikhova V A , Kuchumov M A , Scibin E G , Krachmalniy T A 
Published: February 2021

Abstract
The automated systems for monitoring defects and damages of building structures and materials are considered. The presented systems make it possible to obtain information on the building structures cracks and joints’ opening, the measurements of oscillation and shock acceleration, dynamic soil testing and defects control in composite materials. The “System for monitoring the state of cracks and joints of buildings and structures» is one of the presented systems. This system is necessary for collecting and transmitting information about the cracks and joints’ opening width of the building structures as well as environmental conditions, can be used when inspecting buildings and structures, as well as in automated systems for monitoring the buildings and structures’ technical condition. The modernization of the system sensor makes it possible to measure the humidity and temperature of the external environment and to determine the dependence of the crack opening width on weather conditions. The next element presented by the system is a sensor for measuring oscillation and shock acceleration, also based on an electrochemical principle of operation. The invention makes it possible to solve the problems of increasing the reliability of converting dynamic mechanical quantities into an electrical signal in a wide range of loads and frequencies. It can be used on the construction sites, for seismic measurements and experimental studies. Further, in the system under consideration, an element of which is a load cell sensor, designed to measure voltage in foundation soils, based on an electrochemical principle of action. Load cell allows performing dynamic soil tests, while the technical result is achieved in increasing the device reliability and the measurements accuracy. To determine the defects of composite materials, a non-destructive testing system based on the acoustic emission signals analysis is considered.
Research of abrasive properties separate dust to ensure the reliability of dusting systems in the production of building materials
Authors: Meskhi B Ch , Evtushenko A I , Sergina N M , Azarov V N 
Published: February 2021

Abstract
The intensive development of the infrastructure of large cities, which took place in the second half of the twentieth century, led to the fact that enterprises specializing in the production of building materials and products were in close proximity to urban residential areas. This determines an increase in the requirements for the efficiency and reliability of dust removal systems designed, as is known, to ensure the standardized quality of the air environment of settlements and industrial premises. The dust generated in the production of building materials, in many cases, has abrasive properties, which leads to accelerated wear of the elements of dust cleaning systems. The experience of using such systems shows that dust collectors, as well as shaped parts of air ducts (bends, tees, etc.), through which the dust and gas mixture is transported to dust collectors, are most susceptible to abrasion. Abrasive wear of dust collectors during operation leads to an increase in dust leakage into the atmospheric air into the air of the working area. During operation of a dust-cleaning unit under pressure, damage to the walls of the air ducts also leads to knocking out the transported dust. The supercritical wear of the elements of the dust removal system leads to its failure. The article presents some results of studies of the dust properties of building materials that determine the process of abrasive wear.
Mud stream formation conditions and mud stream hazardous areas of the Chechen Republic
Authors: Sergeeva G A , Adamyan V L , Marinchenko E V , Seferyan L A 
Published: February 2021

Abstract
Mud streams in the mountainous zone are formed almost everywhere in the Chechen Republic: on the northern slope of the Main Ridge and its spurs, the Skalisty, Pastbischny, Lesisty, Terskiy, Sunzhensky ranges and in the depressions between them. The conditions for the mud streams formation and mud stream hazardous regions of the Chechen Republic are determined by orographic tectonic-geomorphological, geological-lithological, soil-plant, anthropogenic and especially hydrometeorological conditions and affect the mud streams with their indicators. The variety and complexity of the relief, as well as the temperature regime, are used to predict the mud stream threat and develop anti-mud stream measures. The authors of the article provide the following indicators: air temperature regime, also values of average monthly and annual air temperatures, monthly values of vertical air temperature gradients in the Chechen Republic territory, changes in annual precipitation (mm) with terrain altitude above the sea level on the northern slope of the Eastern Caucasus, schematic map of orohydrography and mud stream channels of the Chechen Republic on a scale -1: 500,000.