bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dynamic property investigation of segmented acoustic black hole beam with different power-law thicknesses
Authors: Fu Qidi , Du Xiaofei , Wu Jianwei , Zhang Jianrun 
Published: March 2021

Abstract
Traditional acoustic black hole (ABH) structure that usually has a wedge-shaped structure with unchanged power-law profile has been studied extensively. Embedding an ABH in a thin-walled structure can help the system to control the flexural wave to realize vibration damping and energy concentration. However, due to the limitations of processing and manufacturing technology, the structural thickness of the ABH region cannot completely reach zero and will always leave a truncation at the tip of the ABH region, which makes ABH structure cannot give full play to the effect of ABH. In this paper, we show that a beam with segmented ABH structure whose baseline is segmented into two portions and they are respectively subjected to different power functions can effectively improve the effect of ABH. A semi-analytical method is adopted to establish the dynamical model of the segmented ABH beam under the clamped-free boundary condition. Finite element method and experimental method are carried out to verify the accuracy of the semi-analytical model. The segmented ABH effect of the beam is analyzed by the comparison of segmented ABH beam, conventional ABH beam, and uniform beam. In addition, the influence of the damping layer location on the dynamic response of the segmented ABH beam is studied as well. The numerical simulation results show that the vibration energy of segmented ABH beam can be more effectively shifted to the ABH area, thus enhancing the energy concentration effect and vibration attenuation. Moreover, the results also reveal that attaching the damping layer to the tip of the segmented ABH structure can effectively improve the system modal loss factor and achieve better vibration attenuation. The research of this paper can give rise to explorations of different innovative ABH structures and broaden the application of ABH beam structures in engineering.
Joule–Thomson expansion of higher dimensional nonlinearly AdS black hole with power Maxwell invariant source
Authors: Feng Zhong-Wen , Zhou Xia , He Guansheng , Zhou Shi-Qi , Yang Shu-Zheng 
Published: March 2021

Abstract
In this paper, the Joule–Thomson expansion of the higher dimensional nonlinearly anti-de Sitter (AdS) black hole with power Maxwell invariant source is investigated. The results show the Joule–Thomson coefficient has a zero point and a divergent point, which coincide with the inversion temperature T

i
and the zero point of the Hawking temperature, respectively. The inversion temperature increases monotonously with inversion pressure. For the high-pressure region, the inversion temperature decreases with the dimensionality D and the nonlinearity parameter s, whereas it increases with the charge Q. However, T

i
for the low-pressure region increase with D and s, while it decreases with Q. The ratio η
BH between the minimum inversion temperature and the critical temperature does not depend on Q, it recovers the higher dimensional Reissner–Nördstrom AdS black hole case when s = 1. However, for s > 1, it becomes smaller and smaller as D increases and approaches a constant when D → ∞ . Finally, we found that an increase of mass M and s, or reducing the charge Q and D can enhance the isenthalpic curve, and the effect of s on the isenthalpic curve is much greater than other parameters.
Magnetic phases and phase diagram of spin-1 condensate with quadrupole degrees of freedom
Authors: Bulakhov M S , Peletminskii A S , Peletminskii S V , Slyusarenko Yu V 
Published: March 2021

Abstract
We obtain and justify a many-body Hamiltonian of pairwise interacting spin-1 atoms, which includes eight generators of the SU(3) group associated with spin and quadrupole degrees of freedom. It is shown that this Hamiltonian is valid for non-local interaction potential, whereas for local interaction specified by s-wave scattering length, the Hamiltonian should be bilinear in spin operators only (of the Heisenberg type). We apply the obtained Hamiltonian to study the ground-state properties and single-particle excitations of a weakly interacting gas of spin-1 atoms with Bose–Einstein condensate (BEC) taking into account the quadrupole degrees of freedom. It is shown that the system under consideration can be in ferromagnetic, quadrupole, and paramagnetic phases. The corresponding phase diagram is constructed and discussed. The main characteristics such as the density of the grand thermodynamic potential, condensate density, and single-particle excitation spectra modified by quadrupole degrees of freedom are determined in different phases.
Technological Solutions for Slant Directional Drilling Project Challenges
Authors: Anishchenko V I , Zhabin A B , Averin E A , Polyakov A V , Linnik Y N , Linnik V Y 
Published: March 2021

Abstract
The paper describes an experience in the field of slant directional drilling in oil industry, which is currently under pressure. The experience helping to meet drilling projects’ challenges in an effective way has been approved for a several years of work at quite a few projects in different countries. The paper includes some design and technological tricks to overcome standard problems arising during slant directional drilling of oil wells such as entering the ground, maintaining the drilling trajectory, adjusting of an axis misalignment between the rig’s central shaft and the drill line, choosing proper pumps and adjusting pumping pressure, and keeping the drill rods and casings from sliding into the hole from an inclined mast.
Concept of Ensuring Environmental Human Well-Being
Authors: Bezborodova O E , Bodin O N , Chuvykin B V 
Published: March 2021

Abstract
The influence of environmental factors on the population life and activities is beyond any question. Technogenic objects change the quality of the environment and influence its state. It is extremely important to take measures on control and minimization of such action with the use of modern technologies. A large number of researchers study this problem and propose their solutions based upon the principles of the program “Digital Economy”. The advantages of these projects include the line of the research targeted at the prevention of possible threats to human life and safety. The disadvantages consist in the fact that the papers consider either normal or emergency situations; besides, there is no an integral indicator used to describe the human state in such designed environment. The authors propose a Concept of human environmental well-being (HEW CONCEPT) allowing for the generation of methods, ways, algorithms and methodologies for timely identification and elimination of hazard parameters and medical aid provision with the application of modern technologies.
Improving the Technology of Dust Deposition from the Air of Livestock Premises Using an Electrostatic Precipitator
Authors: Cherkasova N G , Chepelev N I 
Published: March 2021

Abstract
This paper provides recommendations based on calculations of the consistent placement of dust separating devices for treating air of livestock premises. This study is relevant due to the fact the atmospheric air and, specifically, the air of livestock premises, always contains a certain amount of dust. Dust accumulation in the air of livestock premises is associated with foddering, premise cleaning, animal cleaning, and animal bedding laying. Dust content in the air livestock premises fluctuates during the day depending on the livestock and poultry foddering and feeding system, ventilation, as well as the manure removal method. From a hygienic standpoint, dust affects the animal organism directly and indirectly. The indirect effect of dusty air is associated with moisture droplets depositing on dust particles and creating fogs. Dust and fog absorb a significant part of solar radiation and worsen the photoclimate, while a layer of dust and soot settling on the windows of livestock premises reduces the natural illumination of the latter. The atmospheric air and the air of livestock premises contain various microorganisms along with dust and smoke. There is a direct relationship between dust content and the number of microorganisms since they usually settle on dust particles.
Evaluation of the Thermal Radiation Intensity During a Fire in the Oil Tank Farm Dike
Authors: Udartseva O V 
Published: March 2021

Abstract
Petroleum product storage facilities are explosion and fire hazard systems. The occurrence of an accident with oil spillage followed by a fire creates the danger of exposure of humans and the environment to thermal radiation. The most typical emergency is a fire of spills in the dike. This paper proposes a technical solution aimed at reducing the fire and explosion hazard for oil tanks. The thermal radiation intensity during a fire of spills in the dike has been calculated. The need to protect the oil storage tank farm with a fence wall with a wave deflector baffle has been proposed and mathematically justified. Along with reducing the likelihood of oil spills at the destruction of a vertical steel tank, this appliance will reduce the environmental consequences of a man-made accident.
Longitudinal Pochhammer - Chree Waves. Secular Equations and Spectral Analysis
Authors: Gadzhibekov T A 
Published: March 2021

Abstract
The paper presents the spectral analysis of the Pochhammer - Cree matrix dispersion equation for longitudinal axisymmetric modes. Analytical solutions of the matrix dispersion equation describing the propagation of longitudinal harmonic waves in an infinite cylindrical rod are analyzed. Expressions for displacement fields are obtained. The dependence of displacements on the surface on the angular frequency and Poisson’s ratio is analyzed. When the phase velocity is equal to the transverse wave velocity, the displacements on the surface completely disappear, which means that no axisymmetric Pochhammer - Cree waves propagate with such a phase velocity.
The Dynamics of Changes in the Concentration of Polluting Components in Discharges of Enterprises of Electrometallurgical Profile and the Development of a Range of Environmental Measures for Wastewater Treatment
Authors: Zvyagintseva A V , Sazonova S A , Kulneva V V 
Published: March 2021

Abstract
A study of the dynamics of change in the concentration of pollutants discharges from electrometallurgical enterprises was carried out. Analytical data are presented for the following ingredients: suspended substances, dry residue, chlorides, sulfates, nitrates, nitrites, ammonium nitrogen, fluorides, iron in general. Possible ways of reducing harmful discharges into the water intake facility (Oskol River) have been analyzed, and the most effective method of combating them for the conditions of the Oskolsk electrometallurgical industrial complex (OEMIC) has been chosen. The use of electrolytic hydrogen for the electroflotation of pollutants from aqueous solutions in the technological processes of water treatment for reuse in the water supply systems of electrometallurgical enterprises is proposed.
Features of Interaction of Crushed Daurian Larch Bark with Petroleum Products
Authors: Zhebsain V V , Zhebsaina S M 
Published: March 2021

Abstract
The work summarizes a series of publications devoted to the study of the sorption capacity of the bark of the Daurian larch, in terms of studying the possibility of its use as a source material for the production of a sorbent for cleaning reservoirs from oil pollution. A simple method of processing the bark of Daurian larch is proposed, which leads to a significant increase in its sorption qualities. The results of experimental studies of the density and sorption capacity of larch bark, as well as the results of spectral studies of its structure, are presented. The conducted research allowed us to determine the mechanism of increasing the porosity of the bark of the Daurian larch during its hydrothermal treatment and, as a result, leading to a significant increase in sorption capacity.
Risk Management in Transportation Safety System
Authors: Finochenko T A , Dergacheva L V , Yaitskov I A 
Published: March 2021

Abstract
This article presents a conceptualized analysis of technology-related risks for a transportation safety system. It also considers its subsystems that impact safety. The scheme developed allowed defining the key factor influencing transport safety through accounting various destabilizing impacts. The authors claim that the human factor is the key one, which is especially true for locomotive crews responsible for transportation. Locomotive crew working conditions are described in a visualized combination of negative effects people suffer in an engine cab. Based on the statistics collected and analyzed, the article presents specific occupational diseases of transportation workers. The dynamics of mental capacity and the state of the cardiovascular system of locomotive crews were analyzed using the WAIS test. The research results can be used in the practices of the Russian Railways to facilitate the efficiency and coherence in decision making related to labor safety.
Method of the Assessment of the Eutrophication of the Waters of the Gulf of Taganrog of the Sea of Azov Subject to the External Load on the Water Area
Authors: Zhidkova A Y , Bednaya T A 
Published: March 2021

Abstract
Eutrophication of waters is a complex problem that is widespread all over the world. These process especially intensified during the last century because of the human activity which lead to the anthropogenic transformation of water reservoirs. The object of the study – the Gulf of Taganrog of the Sea of Azov – also subject to the processes of waters eutrophication. So the research evaluates the Gulf ecosystem from the standpoint of eutrophication. The method of such assessment was developed. It includes the regression analysis and mathematical modelling. The study showed the change in the type of eutrophication of a water body from the mehotrophic type to the eutrophic one; the estimation of the inflow of the concentrations of ammonium ion, nitrate and phosphate into the waters of the Gulf showed the sources that influence this income mostly; the natural load influences the ecosystem most.
To Study Some Characteristics of Porosity of Organomineral Sorbents Obtained by Electroplasmic Processing from Coal Flotation Waste
Authors: Kondratenko A S , Buyantuev S L , Galeguzova I A 
Published: March 2021

Abstract
The article considers the basis for creating organic mineral sorbents with a highly developed porous structure from coal mineral raw materials aimed at developing methods for deep processing of waste coal enrichment - coal cake of the Tugnui coal processing plant by means of electroplasmic activation of its substance, with the development of technology for obtaining carbon sorbents, with the study of their porosity characteristics, the average diameter of macropores for judging the degree of thermal destruction and activation occurring on the surfaces of dispersed cake particles during electroplasmic processing during the implementation of a comprehensive study of coal-mineral raw materials designed to further develop the scientific basis for creating organic-mineral sorbents for wastewater treatment. The article provides microscopic analysis of the composition of the substance of coal-mineral raw materials, data on the composition of minerals included in the substance, determines the composition of the functional groups of cake before and after thermal exposure using IR-spectroscopy, as well as using optical microscopy, studies the porosity of the organomineral sorbent and calculates the average size of macropores.
Quail Droppings Utilization System
Authors: Antonov A , Ivanov G , Pastukhova N 
Published: March 2021

Abstract
Agriculture creates a greater impact on nature than any other sector of the economy. Pollution of the environment by poultry and livestock enterprises is most often due to the imperfection of the technologies and technical means used, non-compliance with established environmental requirements. Special attention should be paid to the problem of processing poultry farms’ and enterprises’ waste, a large proportion of which is droppings. Fresh bird droppings from a poultry farm is dangerous for human health, and considered to be environmental hazard of the third class. The technology proposed for the utilization of fresh bird droppings is brand new and have no analogues in Russian Federation. It bases on the bioconversion process of the droppings from poultry farms with the help of Black Soldier Fly larvae (Hermetia illucens L.). The system proposed gives a solution to several problems: utilization of poultry wastes (bioconversion: 4.9…6.3 kg/m2/day.), using dried fly larvae as a protein rich feed additive in feed production (0.2…2.1 kg/day/m2 larvae); it also supplies agricultural enterprises with organic fertiliser (zoohumus) (zoohumus output: 11.3 12.5 % from 1 kg of wastes). The proposed system has features of production greening, the technology is characterized by the maximum efficiency of agricultural waste recycling and enables to increase the diversity of poultry enterprises functions.
Waste Management of Mining Enterprises of the Arctic Zone of the Russian Federation, Case Study for Murmansk Region
Authors: Tsukerman V A , Ivanov S V 
Published: March 2021

Abstract
The paper discusses relevant problems associated with the exploitation and processing of mineral waste accumulated from mining enterprises during the industrial era. To ensure the preservation of a vulnerable Arctic environment it is necessary to search for the new innovation technologies aimed at increasing the comprehensive use of waste for various purposes of the national economy. The main aim of the work is to assess the efficiency of industrial waste management for the period 2010-2019 by the Arctic mining enterprises which provide open access to the necessary research information. The methodological basis of the analysis are annual reports of enterprises, official documents and scientific publications. The analysis showed that wastes of I-III hazard classes are significantly reduced which meets the requirements of the legislation but wastes of IV and V classes showed multidirectional dynamics and growth respectively. It is shown that for the further improvement of the waste management system there is a need of directions for the search for new comprehensive approaches as development of innovation technologies, reuse of waste with release of new products as part of transition to a circular economy and use of green technologies.
The Role of Geographic Information Systems in Ensuring Food Security in Countries During Epidemiological Crises
Authors: Kiselev V M , Kiseleva T F , Lipatova L P , Miller Yu Y , Petropavlovskaya A V , Kabelkaite-Vaitkiene J A 
Published: March 2021

Abstract
Sudden geospatial phenomena, whether natural or technocratic, regional, or global, including pandemics, confront industrial enterprises, including those in the chemical and technological complexes, with a new kind of uncertainty, creating new risks when making operational and strategic management decisions. These risks often have devastating consequences for economic and social agents caught in these geodynamic phenomena. Amongst the many kinds of dangers, the most economically and socially destructive are changes in consumer demand as related to quantitative, qualitative, and temporal parameters. These shockwaves can have dire effects, including the non-functionality of existing logistical systems, unrestrained costs, a terrifying level of unemployment, etc. In these dramatic scenarios, sector management must develop new strategies to deal with changes in the national economy, ensuring their ability to overcome factors that may otherwise destroy the existing socioeconomic parameters. To minimize these negative phenomena, it is necessary to develop a geographic information system (GIS), the elements of which entail dynamic information about all emerging risks, including the ability to ensure complete safety for all personnel, partners and suppliers, relations with government bodies and the public, and optimal use of financial resources. To build such an anti-crisis system, it is advisable to offer a scientific response to these challenges and many other problems associated with the operation of enterprises in such emergencies.
Study of Maneuverability the AUV flexibly Coupled to the Surface Repeater
Authors: Kostenko V V , Mokeeva I G , Tolstonogov A Yu 
Published: March 2021

Abstract
The towed surface radio communication module (SRCM) allows the high-speed communication channel between the control station and an autonomous underwater vehicle (AUV) to be organized and significantly simplifies the navigation support. Herewith, disturbances by the communication cable acting on the SRCM and AUV are significantly affecting the whole system’s parameters. The paper aims to calculate the additional drag force acted on the vehicle by affecting the towed SRCM and communication cable on the AUV in steady conditions and along typical maneuvering trajectories. A model of an underwater tethered motion control system considers the AUV dynamics, and the communication cable is proposed. A kinematic model of the SRCM has been developed. This model determines the submerging of the communication module and hydrodynamic resistance during towing. The paper presents the results of modeling the tethered system’s movement along typical trajectories typical for survey-search AUV. The results allow the additional requirements to the vehicle’s propulsion system and the required additional buoyancy of the SRCM to be obtained.
Changes in the Agrophysical Properties of the Chernozem Leached with the Use of Defecate and Fertilizers for the Cultivation of Winter Wheat
Authors: Barakina E E , Barakin N S 
Published: March 2021

Abstract
The intensive use of chernozems has led to an imbalance between their effective and potential fertility, as evidenced by the worsening of their agrophysical and agrochemical properties. A necessary condition to solve the complex of agroecological problems is the study and development of scientifically based methods of reproduction and increasing soil fertility. It is also necessary to effectively use fertilizers in combination with other chemical ameliorants for various technologies for the cultivation of agricultural crops in crop rotation aimed at improving the agrophysical properties of these crops and ensuring an increase in their yield and quality while meeting environmental requirements.