bluuebunny/crossref_metadata_2025_split huggingface dataset:
The total dominator coloring of dense, octahedral and queen’s graphs
Authors: Lazuardi A R , Slamin  , Dafik  , Kurniawati E Y , Maylisa I N 
Published: March 2021

Abstract
Let G be a graph, then the dominator coloring of G is a proper coloring, in which every vertex of G dominates every vertex of at least one color class. The Total dominator coloring of graph is a proper coloring with extra property that every vertex in the graph properly dominates an entire color class. The total dominator chromatic number

X
d
t

(
G
)

of G is the minimum number of color classes in a total dominator coloring of it. In this paper, total dominator coloring of dense, octahedral and queen’s graphs have been disscussed.
On resolving efficient domination number of comb product of special graphs
Authors: Hakim R A , Dafik  , Tirta I M , Prihandini R M , Agustin I H 
Published: March 2021

Abstract
Let G be a connected, finite, and undirected graph. A vertex set D in G is an efficient dominating set of G if D is an independent set and for each point υ ∈ V(G)-D is adjacent to precisely one vertex d ∈ D. The representation of points υ ∈ V(G) in respect of an ordered set W = {w
1, w
2,…, wk
} is the k–vector r(υ| W) = (d(υ, w
1), d(υ, w
2),…, d(v, wk
)), which d(u, v) is the distance between the points u and υ. The set W is a resolving set of G if r(u|W) = r(υ| W), for each point u and υ in G. A set of vertices in graph G which is an efficient dominating set and resolving set is called a resolving efficient dominating set. The minimal cardinality of resolving efficient dominating set is called resolving efficient domination number, denoted by γre
(G). The comb product between graph G and graph H is a graph which get from taking a copy of graph G as many vertices of graph H and grafting the i-th copy of graph G to each vertex of H, and its notated by G ▹ H. In this paper, we determine the resolving efficient domination number of comb product graph, namely Kn
▹C
3, Kn
▹P
3, Wn
▹C
3, Wn
▹P
3, and Sn
▹P
2
Analysis of physics concept of newton’s laws on the dadhak merak dance in the reogponorogo cultural arts
Authors: Rahmawati E , Jamalludin  , Sholihah L , Safitri Z A , Handayani R D , Putra P D A 
Published: March 2021

Abstract
Indonesia is a multicultural country with a variety of cultures, one of which is Reog Ponorogo. Reog Ponorogo is a traditional dance passed down from generation to generation as a culture and identity of the Ponorogo society. Unfortunately, many people considered that Reog Ponorogo only as entertainment that does not contain scientific concepts. This research investigates physics concepts, especially Newton’s Law in Dadhak Merak dance of Reog Ponorogo. This research used the content analysis method involving unitizing, sampling, recording, reducing, inferring, and narrating. The result indicated that Newton’s First Law came up in the inertial frame of the Dadhak Merak. Newton’s Second Law is shown in the acceleration changes influenced by the mass and force of Pembarong. Newton’s Third Law is related to the dancer’s reaction force and the ground that raises a lateral force to the Dadhak Merak dance. This research is expected to contribute as a source of information on the development of contextual teaching and learning physics material.
Contribution of Russian Oil and Gas Companies to the Implementation of the Sustainable Development Goal of Combating Climate Change
Authors: Tyaglov S G , Sheveleva A V , Rodionova N D , Guseva T B 
Published: March 2021

Abstract
The paper representing the author’s study of the role of Russian oil and gas companies in combating climate change considers the issue of ensuring sustainable development, which is currently becoming more and more relevant. Using the analysis and synthesis techniques and the analytical and statistical study results, the authors have concluded that the climate change issue is a huge threat to humanity and requires an immediate solution. Oil and gas companies being one of the largest environmental pollution sources should first and foremost take appropriate measures to combat climate change. A systematic approach as the main one has been chosen to study this issue, due to which such diverse elements as sustainable development, the state, and oil and gas companies that have previously been studied separately are considered from a holistic perspective. The paper has proven that the largest Russian oil and gas companies such as Gazprom PJSC, LUKOIL PJSC, and Rosneft OC PJSC recognize the importance of actions to combat climate change and not only include sustainable development goals in their policies and strategies but also implement specific responses to climate change, thereby making a significant contribution to achieving the goal of combating climate change. The paper materials are of practical value for state authorities in terms of improving policies implemented in the field of sustainable development and drawing up regulatory documents and programs. Also, the research results may be considered by oil and gas other industry companies that have not yet passed to more sustainable business development models.
Dibromomethane as Promising Gaseous Fire Extinguishing Substance with Short Atmospheric Lifetime
Authors: Kopylov S N , Kopylov P S , Eltyshev I P , Kopylov N P , Begishev I R 
Published: March 2021

Abstract
Calculation of dibromomethane atmospheric lifetime is carried out, as well as an experimental assessment of its fire extinguishing efficiency. Calculations show that methylene bromide atmospheric lifetime is 15.8 days so it rapidly decomposes in the troposphere. The main mechanisms of the removal of CH2Br2 from the atmosphere are its reaction with hydroxyl radicals and the processes of physical removal from the atmosphere. Special experimental equipment allowing to measure fire extinguishing concentration of gaseous fire suppressant having high boiling point is described. Experimentally measured minimum extinguishing concentration of methylene bromide for n-heptane is 2.5 % vol. According to this, CH2Br2 is close to the most effective gaseous fire extinguishing agents, such as C3F7I and C2F4Br2. LOAEL value for CH2Br2 is predicted at the level of 0.3-0.4 % vol. Due to the high boiling point of methylene bromide and its relatively high toxicity, the most appropriate way to use it in fire suppression is to create fire extinguishing mixtures, in particular, with fluorinated hydrocarbons. This approach allows to diminish application of greenhouse gases in fire protection and also to solve the problem of toxicity of extinguishing substance.
Theoretical and Numerical Analysis of One Euler Two-Layer Completely Conservative Difference Scheme of Gas Dynamics with Adaptive Viscosity
Authors: Rahimly O R , Poveshchenko Yu A , Podryga V O , Rahimly P I 
Published: March 2021

Abstract
For the equations of gas dynamics in Euler variables, using the operator approach, a family of two-layer in time completely conservative difference schemes (CCDS) with space-profiled weight factors used to approximate the momentum and energy fluxes in time is constructed, theoretically and numerically studied. The schemes have second-order accuracy and are implemented using simple iterative processes. A class of divergent adaptive viscosities for these CCDS is developed and a theoretical analysis of their stability is carried out. The regularization of flux terms of the gas dynamics equations with the help of adaptive artificial viscosity is proposed and, using the example of well-known Einfeld problem, is numerically investigated. This regularization effectively eliminates nonphysical oscillations of the solution, entropy peaks and preserves the property of complete conservatism of schemes of this class.
Reducing the Vulnerability of Critical Facilities by Improving the Protection of their Critical Elements from Terrorist Attacks
Authors: Dubinin E F , Kuksova V I 
Published: March 2021

Abstract
The vulnerability of a critical facility depends to a large extent on the protection of its critical elements (structural or technological). Their failure leads to termination of normal functioning of facility or to emergency situations. Therefore, first of all, it is necessary to identify critical elements and analyze their vulnerability with regard to the most probable spectrum of terrorism-related threats, determined on the basis of scenario analysis taking into account new methods of technological terrorism. It is useful to divide critical elements into categories in accordance with physicochemical processes taking place in them and design features. The results of vulnerability analysis and identification of critical elements to be additionally protected are the initial data for improving the facility’s protection system. The decision as to whether additional costs should be incurred to ensure security of facility is made on the basis of a quantitative assessment of the ratio of corresponding costs, risks and losses.
Studies of Oil Viscosity Under the Influence of Thermal and Electromagnetic Fields
Authors: Kosianov P M 
Published: March 2021

Abstract
This article presents the results of theoretical and experimental studies of the dependence of oil viscosity on various physical parameters. Thus, the influence of thermal and electromagnetic fields on the reduction of oil viscosity is considered. The dependences of oil viscosity on temperature, electromagnetic field strength, frequency and shape of the alternating field are determined. The way to increase oil production by integrating various physical methods is shown.
Research of the Rate of Changing the Mine Suspended Monorail Brakeforce When Braking
Authors: Ignatkina E L , Kostenko A V , Tsarenko S N 
Published: March 2021

Abstract
A technique to determine the rate of increase in brakeforce developed by the braking device of a mine suspended monorail is proposed. Based on the experimental study, the results of the analysis of the rate of change in the brakeforces developed by the brake shoes are given.
Industrial Technology Facilitation for the Dredging of Highland Placers
Authors: Kostromin M V , Yakimov A A 
Published: March 2021

Abstract
As the reserves of alluvial placers in river valleys are getting depleted, the importance of highland placers increases. In some cases, it is possible to use dredging for their development. Dredging is successfully applied to develop a highland placer of the Yakh- Suyskoye deposit located in northwestern Pamir at the altitude of 2000 m or more. A 380-liter dredge is used there. This deposit faces specific problems. They include steep slopes and narrowness of the valley, unevenness of the placer bedrock with lots of sharp bumps and dips, lots of boulders and dredging waste in the placer, adverse hydrogeological conditions that hamper the development and the maintenance of the water level. Due to this, the dredge operated in the semi-bank mode. Besides, the dredge aft was regularly displaced to dispel dredging wastes, which decreased the dredge performance while not being able to eliminate the bottom break hazard and the accumulation of dredging wastes in the pontoon. All of the above calls for the development of a new placer development technology that would prevent negative impacts. Based on the previous research, we developed and introduced a placer development technology stipulating the increase of the water level by 7 m. To this end, we constructed a dam on the waste piles below the dredge. The dam was 10 m high and 120 m wide. Since the permeability coefficient of the river Safet-Dora rocks is 75-80 m/day and that of the dredging waste piles is 500 m/day, the dam was equipped with polyethylene film sealing screens. This new dredging technology with a 7.5 m water level increase allowed us to process the site in one bank; eliminate the accumulation of dredging wastes at the pontoon aft and the risk of pontoon breakage on the bedrock bumps; increase the dredge operation time by 1.3 h/day; prevent river pollution; acquire significant economic benefits. Thus, we developed and introduced a relatively simple and efficient dredging technology for highland placers, which can be recommended for further use.
Assessment of Self-Cleaning from Heavy Metal Contamination of the European Territory of Russia Northern River Ecosystem
Authors: Zimovets A A , Ovsepyan A E 
Published: March 2021

Abstract
Self-purification from heavy metals (Cu, Ni, Pb, Zn, Cd and Cr) was assessed in the estuary area of the one of the largest river ecosystems in the European territory of Russia – the Northern Dvina River estuary. The conditional degree of self-purification of river waters and bottom sediments for winter and summer is calculated. It is noted that the highest values of self-purification of river waters are observed in winter for Cu (54%), Pb (25%), Cd (67%), Cr (82%), and in summer – Zn (44%) and Ni (50%). It was found that the processes of migration of Ni, Zn and Pb from bottom sediments to water predominate in winter, while in summer this process is typical for Pb, Cd and Cu. The index of river water pollution in the seasonal dynamics of heavy metal content was established.
Information Analytical Calculation and Construction of Dispersion Maps of Pollutants in the Surface Layer of the Atmosphere at a Specialized Facility
Authors: Kulneva V V , Zvyagintseva A V , Sazonova S A 
Published: March 2021

Abstract
We carried out an environmental audit on the territory of a specialized facility of all sources of environmental pollution and, accordingly, we measured the concentration of polluting components embodied in the atmospheric background. As a result of the inventory of emission sources, we recorded the following picture for the total emissions of pollutants into the air zone of the facility: 1.647832 t/year, including 1.597435 t/year in the liquid and gaseous state, and 0.050397 t/year in the solid state. We present the calculation of pollution from generators of emissions of the air zone of the facility, which is recorded on the basis of the Unified Atmospheric Pollution Calculation Program (UAPCP) “Ecolog” (version 3.0). According to the feasibility study, the dispersion calculation was recognized as socially effective for site 2 (hangar) - for NO2, NO, kerosene, CO, SO2, and abrasive dust. We calculated the surface concentrations of harmful substances in the atmosphere and constructed dispersion maps for the object for the winter period. The implemented research showed that the accumulation of contaminants does not reach the standard values of concentrations at key points suitable for determination at the boundary of the sanitary protection zone and the residential area. The dispersion calculation indicators showed that the predominant fraction of all diffusing contaminants for the hangar in the sanitary protection zone is NO2 0.82 parts of the maximum permissible concentration with and without background 0.697, and in the residential area, 0.11 parts of MPC without background.
The Stabilization Ensuring of the Underground Pipelines Design State in the Permafrost Conditions
Authors: Kozhaeva K V , Akchurina E A 
Published: March 2021

Abstract
The article considers one of the possible options for improving the technology of construction of underground pipelines in conditions of permafrost soils, which today is very relevant. The most significant disadvantages of the existing methods of underground laying of pipelines on permafrost soils are the thermal and mechanical impact of the pipeline on the soil base during operation and the occurrence of unacceptable plastic deformations of the pipeline. The purpose of the studies is to prevent or minimize the thermal impact of the pipeline on MMG during operation, and as a result, to ensure stabilization of the design position of the pipeline by preventing unacceptable plastic deformation of the pipeline. The main tasks solved in research: develop a method of laying an underground pipeline that eliminates thermal impact on the containing frozen soil; simulate the underground pipeline laying structure and calculate stress-strain state in the ANSYS software complex, as well as forecast calculation of thermal interaction of the structure on frozen soil in the FROST 3D Universal software complex.
Prediction of the Viscosity of Liquid Petroleum Products
Authors: Grigoriev B , Boldyrev D , Koldaev A 
Published: March 2021

Abstract
The article deals with the new technique for predicting the viscosity of liquid petroleum products, which differ significantly in physicochemical properties and fractional composition, in a wide range of state parameters. No specific information is used to predict viscosity other than molar mass, average volume boiling point, and relative density at 20 °C. It is shown that the deviation of the predicted values from the experimental data is comparable to the error of the viscosity measurement. Methods for correcting the calculation results using limited experimental information are proposed. The application of the developed method is advisable in conditions of a lack of empirical information about the petroleum products viscosity. Keywords: viscosity prediction; petroleum products; petroleum fractions.
Problems of Maintaining of Real Estate Cadastre as Exemplified by Cadastral Registration of Allotment Cottages
Authors: Ershova N V , Kharitonov A A , Vikin S S 
Published: March 2021

Abstract
Gardening is traditionally widespread in Russia. As of 2018, there were 180,612 allotment gardens in Voronezh Oblast. The area of land of horticultural non-commercial associations of citizens that were objects of agricultural census was 19563.8 hectares. The field of cadastral registration of buildings on allotment garden plots certainly inherits the general problems of maintaining the real estate register. In this area there are also problems associated with the difficulties of classifying real estate objects within cadastral registration and problems of reliability and completeness of information contained in the Unified State Register of Immovable Property (EGRN), as well as problems related to updating the EGRN data and correcting errors of various origins. The notion of allotment garden plot, as well as allotment cottage, has changed several times in recent decades. The latest changes in the status of allotment cottages occurred in 2019, so the evolution of the notion of allotment cottage may not be complete yet. At the same time, the problems of classifying real estate objects are also relevant in the field of cadastral registration of allotment cottages, since errors in the classification of real estate objects are one of the factors in the emergence of register errors and consequent input of inaccurate information in the EGRN. Thus, the issues of classifying real estate objects in the case of buildings located on allotment garden plots are of particular relevance. The solution of these issues directly determines whether this object is subject to cadastral registration and influences the calculation of cadastral value of the building. At the same time, in the particular case of allotment cottages the line between different classification groups in regulatory legal acts is blurred, which complicates the cadastral registration procedure.
Mathematical Description of the Process of Adsorption of Metal Ions by Modified Zeolites in Adsorbers with a Fixed Adsorbent Layer
Authors: Obuzdina M V , Rush E A , Gozbenko V E 
Published: March 2021

Abstract
The solution of the problem of mathematical description of the processes occurring directly in the adsorber apparatus with a fixed layer of the solid phase and comparisons of the results with known classical representations is presented. The following characteristics were calculated: equivalent particle diameter of the sorbent, permissible fictitious velocity of wastewater, adsorber diameter, hydraulic resistance, Reynolds criterion, Prandtl test, Nusselt mass transfer criterion, external and internal mass transfer coefficients, mass transfer coefficients (including taking into account longitudinal mixing), general number of transfer units. The calculation was made taking into account that in the adsorber under consideration the fixed layers of adsopbent are located on cassettes, the distance between which is 0.01 m, which affects some characteristics of the adsorber apparatus with a fixed layer of a solid phase (modified zeolite).
Evaluation of Urban Microclimate Parameters as Indicators of Pedestrian Ways Environmental Comfort
Authors: Pilipenko O , Skobeleva E , Bulgakov A 
Published: March 2021

Abstract
A variant of the methodology for quantitatively assessing the availability, comfort and environmental safety of residential areas was proposed by the authors. The principles of creating a biosphere-compatible city, without conflict with the environment and developing a person, were taken as a basis. According to the main provisions of this concept, the degree of implementation of the city’s functions is determined by the level of accessibility of these functions for all of its residents, regardless of the characteristics of their health and age. It is proposed to introduce the parameter of time to meet human needs into the system of indicators of master plans as one of the parameters of a comfortable and safe urban environment. It is supposed that socially significant objects of everyday service of residents, as well as open spaces for recreation, should be located on the territory of residential buildings within walking distance at a comfortable distance from the places of residence. At the same time, pedestrian communications in residential areas, in particular those leading from places of residence to the objects under consideration, must comply with environmental safety requirements, as well as open urban spaces for recreation, games, and sport. To assess these parameters an integral indicator, one of the components of which is the predicted level of thermal comfort, was proposed in the work. To determine it, it is proposed to use the bioclimatic index, that is the physiological equivalent temperature (PET). In this work, based on the example of a new residential area in the city of Orel, the corresponding integral indicators were determined in terms of assessing the availability of educational facilities and open green urban spaces, including some points of pedestrian communications. The calculation results showed that when planning a new micro-district, the values of the levels of implementation of city functions in terms of the accessibility of socially significant objects, as well as the levels of comfort and environmental safety of pedestrian communications and open urban spaces, differ significantly from the maximum possible. It is noted that when designing a micro-district and arranging pedestrian communications and open spaces, no attention was paid to ensuring a comfortable climatic regime. Conclusions about the influence of built environment on the temperature regime in the territories of the considered locations are made. It is supposed that expanding the range of indicators for assessing territorial planning projects for analyzing accessibility by time parameter, as well as for assessing the level of environmental safety and comfort, will increase the efficiency of the use of urban planning methods in the planning and development of residential micro-districts in order to create an urban environment that contributes to the preservation of health of residents.