bluuebunny/crossref_metadata_2025_split huggingface dataset:
Detonation in bubble media: the effect of initial pressure
Authors: Sychev A I 
Published: November 2020

Abstract
The influence of parameters of mono- and polydisperse, one- and multicomponent bubble media on the conditions of initiation, structure, propagation velocity, and pressure of detonation waves is experimentally investigated. It is established that the variation of initial pressure of bubble medium is an efficient method to control the parameters of waves of “bubble” detonation.
Study of an effect of promising cellulose components on the physico-mechanical properties and a burning rate of a combustible material for combustible cartridge cases produced according to the filtration casting technology
Authors: Fataliev R V , Eneikina T A , Kozlova L A , Gatina R F , Mikhailov Yu M 
Published: November 2020

Abstract
At present, cellulose and nitrocellulose components used in the field of ammunition are manufactured from a cotton linter or a wood. However, over the last decade the raw material characteristics, including for the nitrocellulose production for special purposes, have changed significantly both in connection with the loss of the traditional source of the cellulose raw material (the cotton linter) and with the deterioration of the quality of cotton cellulose. The new types of cellulose materials (a flax, a hemp, oats and etc.) have appeared on the market in due to the cotton deficit, intended for the special-purpose nitrocellulose. If we take into account the need to develop a component base based on the available domestic annually renewable sources of raw materials, then there is no doubt that the flax should be considered as a promising one.. In this connection, the possibility of an application of the flax pulp and NC based on it when manufacturing the combustible articles was investigated.
Transport through the array of vortices: from microscopic model to macroscopic transport with immobilization
Authors: Khabin Mikhail R. , Maryshev Boris S , Klimenko Lyudmila S 
Published: November 2020

Abstract
The paper is devoted to the study of longitudinal solute transport through an array of vortices, bounded by rigid walls. Since the fluid velocity in such system is very heterogeneous, the transfer of solute particles has non-trivial properties. Some particles can flow into the vortex driving by diffusion. These particles do not move in a longitudinal direction. As a result, the observed transport process is similar to the transport with immobilisation. It allows dividing the full solute concentration to mobile and immobile by analogy to the MIM approach. Mobile solute transports with the mean flow in a longitudinal direction. The immobile solute is immobilized by the vortices. The solute transition between these two phases is provided by the diffusion and determines by the concentrations in both phases. The MIM approach is used very often for modelling the transport in porous media. Usually, the particle immobilisation in porous media is explained by the interaction of solute particles with a solid matrix of porous media. However, the flow through porous media is complex and vortices are formed by the interaction of flow with the solid matrix of media. We model the transport of initially heterogeneous distributed solute through the channel by the flow with vortices. The modelling is performed into the terms of special flow by the microscopic methods. The distribution of passage time is compared for the same distribution obtained by standard linear macroscopic MIM model. The comparison is performed by the solution of the inverse problem with minimization the difference between these two distributions. As a result, the parameters of the linear MIM model is defined and its dependence on the vortices structure and the molecular diffusivity is obtained.
Defining the out-of-limit state of the rocks in the vicinity of the working contour
Authors: Chanyshev A I , Abdulin I M , Belousova O E , Lukyashko O A 
Published: November 2020

Abstract
The problem of defining the stress-strain state of a rock mass near the working contour is solved by the Cauchy stress vector and the displacement vector set on it. To do this, you also need to know the elastic properties and the passport curve of the material “tangent stress – shift” with a section of extreme deformation. The information obtained in solving the problem allows us to judge the condition and remaining reserve of strength of the material both on the contour of the rock mass itself and in its vicinity.
On durability of a hydraulic fracture filled with proppant particles
Authors: Shelukhin Vladimir V. , Sannikova Anastasiya S. 
Published: November 2020

Abstract
On the basis of conservation laws and basic principles of thermodynamics, a mathematical model is developed for flows of a two-phase granular fluid. The phases consist of a viscoplastic granular Bingham fluid and a viscous Newtonian fluid. As an application, one dimensional flows are studied in a channel to address the stability of the proppant pack which fills a hydro-fracture. We find correlations between the phase flow rates and the pressure gradient. Such correlations are similar to a Darcy law. We determine a criterion for the initiation of motion of a granular phase in a porous medium. Given a yield stress of the granular phase, it is proved that this phase does not flow if either the pressure gradient or the channel thickness is small. The phase flow rates are studied numerically at various input parameters such as the phase viscosities, yield stresses and etc. The factors slowing down the penetration of the solid phase into the porous medium are revealed.
Free-surface flow behind elastic plate impacting on a thin liquid layer
Authors: Shishmarev K A , Khabakhpasheva T I , Korobkin A A 
Published: November 2020

Abstract
The problem of an inclined impact by an elastic plate on a thin liquid layer is considered. Evolution of the flow behind the plate is studied. The main input parameters are the position of the separation point of the liquid from the plate and the speed of the liquid under this point. The flow in the wake behind the plate is described by shallow water equations without gravity. Analytical formulae for the shape of the free surface behind the plate are derived. The study is focused on the possibility of the formation of jets arising from the wake perpendicular to the liquid layer. The problem is solved in two stages: before and after the formation of the first such a jet. The effects of the flow speed at the beginning of the wake, its time derivative, and the law of motion of the separation point on the formation of jets are investigated. The positions of the jets, their speeds and shapes are determined. Using the obtained results, mechanisms of the thin layer aeration behind the plate are discussed.
Hot melt splash upon impingement of a water jet
Authors: Yakush S E , Sivakov N S , Melikhov V I , Melikhov O I 
Published: November 2020

Abstract
As a pre-requisite for powerful steam explosion following the spread of molten high-temperature material over the bottom of water pool, a premixed zone must be formed with certain contents of melt, water, and vapour. Experimental observations indicate that melt spreading is featured by the formation of periodic melt splashes which can be responsible for the phase premixing. The paper considers one of the key phenomena involved in this process, namely, the splash of hot melt due to impingement of a high-velocity water jet. Numerical simulations are performed in the axisymmetric formulation, revealing the whole process of water-melt interaction, as well the development of melt flow leading to its splash. Parametric study is presented for the melt splash height dependence on the water mass and velocity.
Study of the pattern of fluid flow in the pore space of kerogen-clay-carbonate-siliceous rocks of Bazhenov Suite
Authors: Grigoriev A S , Shilko E V , Kontorovich A E 
Published: November 2020

Abstract
The paper is devoted to a numerical study of the features of fluid redistribution in the pore space of an unconventional hydrocarbon reservoir of the Bazhenov Suite (West Siberian oil and gas basin). We analyzed the filtration properties of the microscale layers of the formation with composite structure and multiscale porosity using the triaxial compression test. The simulation results showed that the flow rate of the pore fluid is determined by a set of parameters, including the rate of change of local stresses, the permeability of the skeleton, the viscosity of the pore fluid, reservoir pressure and the size of its differential region. We revealed the dimensionless combination of these parameters that uniquely determines the value of the fluid flow rate. The results of the study can be used in assessing the contributions of the structural elements structure to reservoir production capacity.
Dispersive and hyperbolic models for non-hydrostatic shallow water flows and their application to steep forced waves modelling
Authors: Chebotnikov A V , Chesnokov A A , Khe A K , Yu Liapidevskii V 
Published: November 2020

Abstract
We propose a hyperbolic system of first-order equations that approximates the 1D Nwogu model of the shallow water theory for non-hydrostatic unsteady flows. Solitary waves in the framework of these models are constructed and studied. The evolution of solitary waves on a mildly sloping beach is considered. We show that the solution of the hyperbolic system practically coincides with the corresponding solution of the Nwogu dispersive equations. Steep forced water waves generated by a harmonically oscillating rectangular tank are studied both experimentally and numerically. A comparison of the solutions of the modified Green–Naghdi and Nwogu equations with the obtained experimental data is made.
Multispark initiation of propane combustion in an enclosed volume
Authors: Teslenko V S , Drozhzhin A P , Anisichkin Yu V 
Published: November 2020

Abstract
The initiation and combustion of propane-oxygen (P0 = 1 atm) are experimentally studied by using multispark discharges (ranging from 1 to 9 in number), which are differently located in the cylindrical chamber 72 mm in diameter and 4 mm high. The methods of synchronous recording and measurements of parameters of force pulses with 26 µs resolution piezodynamometer were used in the studies. It was shown that for identical gas charges, the duration of generation of force pulses decreases by 30 % as the number of initiation sparks rises in comparison to one-spark initiation in the center of the chamber.
Model assessment of the lifetime of a composite overwrapped pressure vessel under creep conditions
Authors: Eremin N V , Moskvichev V V 
Published: November 2020

Abstract
An approach has been developed to estimate the lifetime of a composite overwrapped pressure vessel under creep conditions. Creep tests of unidirectional composite material based on T1000 carbon fibers and epoxy resin were conducted at high temperatures. Experimental creep curves were obtained and the creep rate for each specimen was determined. A numerical analysis of creep of a composite overwrapped pressure vessel subjected to a constant pressure was carried out. Time-strain curves are obtained for each characteristic point in the composite shell. The strains range up to 12.5%. The curves of relaxation of tensile stress in a composite overwrapped pressure vessel are obtained. The stress gradually decreases from 926 to 564 MPa. The structure of the vessel considered remains stable without critical strains and stresses after 50 years of exploitation. Using the proposed modeling approach of a composite overwrapped pressure vessel, taking into account the effect of creep in the composite shell, it is possible to evaluate the lifetime of the structure.
Media security of megascience projects: legal experts training
Authors: Galyashina E , Nikishin V 
Published: November 2020

Abstract
The article discusses the problems of legal experts training to ensure the effective functioning of global research infrastructures (megascience projects) in the context of information-worldview security of media (including Internet communication). The activity of legal experts in the field of megascience projects implies risk management of media security within which the ranking of media waves and the prevention of illegal speech actions are carried out. The work of a legal expert in the field of media security is greatly interdisciplinary and requires exclusively developed management skills. This specialist acts precisely within the framework of information risk management coordinating and moderating the work of the organization’s structural units. A highly qualified specialist in this area, in addition to fundamental legal knowledge, should also possess creative, heuristic expert thinking, be able to analyze, generalize, screen out and differentiate incoming information in the media stream. It is vital for the objective legal-linguistic examination of defamatory, fake and extremist-terrorist discourse. The basis for the formation of such an expert thinking can be the provisions of forensic expertology as a synthetic legal science that studies the patterns of using special knowledge in legal proceedings. The developments in the field of forensic speech science (which studies speech traces of offenses in the media sphere) are particularly valuable for the training of lawyers in the field of media security. The authors consider the classification of speech offenses against media security of megascience projects and justify that legal education in the megascience field is the training of a wide-profile specialist who is able to apply deep legal and linguistic knowledge in a progressively increasing set of situations and experiences, challenges and threats to media security of megascience projects; who can easily adapt; who is ready to acquire new competencies, learn and grow, find his/her own place in a rapidly changing world.
Training of lawyers in the field of megascience projects: innovations in legal education
Authors: Mazhorina M , Nikishin V 
Published: November 2020

Abstract
The article is devoted to the analysis of the prospects for the development of educational programs aimed at training lawyers in the field of megascience projects. Legal support of megascience projects involves legal support of intellectual resources and protection of the results of intellectual activity, legal regulation of financing of these projects, international legal regulation of scientific and technical cooperation, legal support of cyber security, information-law (including anti-defamation) support of media security of these projects, etc. The authors consider the model of educational training of lawyers for megascience projects in the paradigm of interconnection and interdependence of innovative social relations, science, and education. R&D intensity (knowledge-intensity) of educational training of lawyers in the field of megascience is justified and considered as a feature that is no less significant than practice-orientedness (applied directedness), ensuring not only the short-term competitiveness of educational products, but also their long-term and stable prospects due to the incorporation of the latest cutting-edge R&D achievements into education. The authors suggest a term ‘innovative programs for forward-looking areas’ and analyze their capacity for legal support of megascience projects (the current innovative programs implemented at Kutafin University (MSAL) and the MSAL scientific projects that can be the basis for new educational programs). The authors consider the principles for the implementation of innovative programs for forward-looking areas: fundamentality and practice-orientedness (including the institution of ‘community of practice’ and the mentoring institution), R&D intensity, networking, meta-learning etc.
The legal issues of foreign citizens participation in megascience projects
Authors: Zaplatina T S 
Published: November 2020

Abstract
The article is devoted to the analyses of the issues of legal regulation of issues of foreign citizens participation in megascience projects. The large-scale nature of megascience objects that distinguishes them from other research infrastructures is expressed primarily in the scale of the objects of research, in terms of the complexity of their creation, the complexity of operation, as well as the exchange of workforce in the process of research exercising. Considering the issue of personnel exchange in the framework of large-scale research, it is necessary to focus not only on conducting the research in the framework of megascience, but also on legal regulation of foreign researchers attraction, or the problem of the entry and residence of foreign scientific researchers. The EU has a procedure for admitting third-country nationals recruited for the purpose of conducting research activities, independent of their legal relationship with the host research organization and not requiring a work permit in addition to authorization. This procedure is based on cooperation between research organizations and the immigration authorities of the EU Member States. The existence of specific procedure for the entry and residence of foreign scientific researchers helps to remove barriers in the migration of researchers, expand the scientific exchange. In this regard the EU legal experience in the scope of researchers migration regulation should be used as a model for improving the Russian Federation legal regulation in the same scope.
Effective scientific personnel training in the field of modern computer technologies for the implementation of advanced research projects of the Megascience class
Authors: Shtanko A N , Kulik S D , Kondakov A A 
Published: November 2020

Abstract
Successful research projects of the Megascience class usually require a well-trained team of scientists from various fields of knowledge. These scientists must be high-skilled experts. Each member of a team like that must have the necessary, specialized cross-industry skills, for example, in such areas as artificial intelligence, convolutional neural networks, specialized intelligent search engines, and full-text analysis. One of the key aspects of effective personnel training for successful implementation of Megascience projects into reality is the acquisition by students professional skills, abilities, and knowledge to use tools of modern scientific technologies, containing, for example, libraries of programs (functions). In particular, convolutional neural networks and intelligent search systems can be applied in various research projects in the field of physics, chemistry, biology, and medicine, for example, in telemedicine, for effective decision-making in diagnosing a patient. Therefore, understanding the principles of neural networks and intelligent search systems is a necessary competence of researchers working in the framework of Megascience projects. Classic search engines are based on indexing the textual information of the database that is being searched. Intelligent search engines can improve the search experience through intelligent data processing, including using convolutional neural networks. This report examines practical examples and areas of the successful application of convolutional neural networks and information systems in practice.
Conventional and institutional models of international scientific and technical cooperation on the example of marine scientific research
Authors: Teimurov E , Kozheurov Ya 
Published: November 2020

Abstract
A unifying aspect in researchers’ understanding of the essence of the legal model is that it acts in such a way that describes objects, processes or phenomena of legal life. With due regard to the forms of international cooperation, we can identify conventional and institutional models of international scientific and technical cooperation (ISTC). The institutional model characterizes the status and activities of the subjects. The conventional model primarily reflects a set of legal regulators of the interaction between subjects. However, the conventional model is not limited solely to international agreements and customs. It also includes instruments containing soft law rules. To elucidate the ISTC models in the field of marine research, the authors have analyzed the concept of “marine scientific research” as well as the development of the institution governing the interaction between subjects of international law and other actors in the field of marine scientific research (MSR) and the exchange of technologies within the framework of international law of the sea. As a result of the study, the authors conclude that the conventional model of ISTC in the field of MSR is based on the 1982 UN Convention on the Law of the Sea and includes bilateral and multilateral international agreements, decisions and resolutions of competent international organizations, and legal instruments containing soft law rules aimed at specifying various aspects of cooperation. The institutional model in MSR means creation of international intergovernmental and non-governmental organizations. ISTC institutional models can be divided into ecosystem models and collaboration models. Ecosystem models create the necessary legal, organizational, economic and other conditions (environment) for international cooperation and joint marine scientific research. Collaborative models are created directly for the implementation of international scientific research. However, there is no strict borderline between them.
Megascience facilities in global research infrastructure
Authors: Kozheurov Ya , Teimurov E 
Published: November 2020

Abstract
The term “unique scientific facility of the “Megascience” class” (USFMC) has come into widespread use in legal acts of a programmatic nature, which necessitates the study of the term in a legal context and determination of the relationship between this concept and the widely accepted term “global research infrastructure” (GRI). On the basis of the analysis of legal acts, policy documents and doctrinal sources, two key features of USFMC can be identified: 1) their large scale (physical, financial, technological), and 2) their particular relevance to science facilitating some breakthrough in a particular field of expertise. The study of the GRI essence makes it possible to propose the following definition: global research infrastructures are massive, valuable, unique due to their technical specifications complexes constructed and operated in the order of international cooperation (collaboration) between States, international organizations and other actors without international legal personality (State agencies, scientific institutions, funding institutions) and designed for long-term scientific research aimed at obtaining new breakthrough knowledge, substantially supplementing or modifying perceptions of reality. The domestic term “unique scientific facility of “Megascience” class” has the greatest overlap with such global research infrastructures as geographically localized (single-sited) large research infrastructures. The authors conclude that in order to align the domestic legal terminology in the field of “Megascience” with the terminology accepted world-wide, amendments should be made to the draft Federal Law “On Scientific, Scientific-Technical and Innovative Activities.”