bluuebunny/crossref_metadata_2025_split huggingface dataset:
Laser shock peening
Authors: Inogamov N A , Zhakhovsky V V , Ilnitsky D K , Khokhlov V A 
Published: February 2021

AbstractElastic-plastic transformations together with or separately of polymorphic phase transitions are important for the theory of shock waves. Here we discuss changing a classification consisting from elastic, split elastic-plastic, and pure plastic shocks. The split shocks means that there are two jumps: the elastic precursor and plastic shock, and that the elastic jump is independent relative to plastic one. In the split regime the precursor moves with elastic speed of sound overrunning the plastic jump and going further and further ahead relative to plastic jump as time proceeds and becoming weaker and weaker. We oppose the split shock to the one-wave (1W) two zones (elastic and plastic—2Z) shock (1W2Z shock). The 1W2Z wave propagates as whole (therefore one-wave), the plastic shock dynamically supports the elastic one, and the average distance between the jumps does not change in time. The powerful elastic shocks (their amplitudes are much higher than are usually suggested for elastic shocks) were found in experiments with femtosecond laser pulses and confirmed in large scale molecular dynamics (MD) simulations. The observation of the 1W2Z shocks is another important finding coming from MD. The report is devoted to lasers, shocks, and applications. In the second part of the report the generation and propagation of the shocks created for laser shock peening by lasers with ultrashort or nanosecond pulses are considered.
First tests of laser ignition in Wankel engine
Authors: Loktionov E Yu , Pasechnikov N A 
Published: February 2021

Abstract
Laser ignition has been studied in powerful four-stroke engines, not only because of the fast payback, but also because of the more convenient diagnostics in a large scale setup. High-performance compact engines have not been studied, even though advantages of laser ignition could be much more pronounced for those because of harmful emission reduction and multi-fuel abilities. Compact piston engines are considered as an alternative for fuel elements and batteries for portable, automotive and unmanned aerial vehicles. These are characterized by a small combustion chamber comparable to the spark plug inter-electrode gap in axial direction, and its low ratio to bore size. However, for Wankel engines this problem exists at any scale. Laser ignition of lean fuel mixtures in such engines could significantly improve performance by reduced fuel consumption, thermal loads, and a cleaner exhaust. We have investigated the possibility of laser ignition in rotary-piston (Wankel) sub-kW scale model engine using different kinds of fuel mixtures: hydrogen, methane, propane, butane, gasoline, and ethanol based. A custom built compact diode-pumped solid state laser has been used to substitute the original glow plug, respectively. Laser ignition has been found possible and quite beneficial for both types of engines and different fuel mixtures; in terms of NOx emission reduction especially.
Carpet-3 experiment for ultrahigh-energy astrophysics: Current-state and prospects
Authors: Romanenko V S , Petkov V B , Dzhappuev D D , Lidvansky A S , Gorbacheva E A , Dzaparova I M , Kudzhaev A U , Klimenko N F , Kurenya A N , Mikhailova O I , Khadziev M M , Troitsky S V , Yanin A F , Zhuravleva K V 
Published: February 2021

Abstract
The Carpet-3 air shower array is being built at the Baksan Neutrino Observatory, which is located near Mount Elbrus (North Caucasus) at an altitude of 1700 m above sea level. The main aim of the experiment is gamma-ray astronomy in the energy range above 100 TeV to search for diffuse gamma radiation and sources and to study the generation mechanisms of this radiation. The paper provides an overview of the current state of the experiment, as well as its prospects.
A new method for energy gas producing from biomass
Authors: Krylova A Y , Madumarova M M , Shevchenko A L , Sytchev G A , Zaichenko V M 
Published: February 2021

Abstract
Biomass is known to be an alternative source of energy due to its availability and less environmental impacts in comparison with fossil fuels. Widespread of biomass allows us to solve the problems associated with development of local energy production. The developed at the Joint Institute for High Temperatures of the Russian Academy of Sciences technology for biomass energy utilization let to reduce energy consumption. It is achieved through the use of energy released during exothermic reactions, which is accompanied by heating of various types of biomass, which, as it follows from the literature, is realized for the first time in the processes of gas fuel producing. The second energy-saving factor of the developed technology is that the heat source is the gas piston power unit (GPU) combustion products. In this case, a cogeneration scheme is implemented. The results of experiments on the biomass conversion in GPU combustion products medium and numerical calculations in a one-dimensional non-stationary approximation are presented. The method of biomass thermal conversion under development will make it possible to obtain gas fuel or energy supply systems at local fuel and energy resources.
Plasma screening enhancement of thermonuclear reaction rates
Authors: Chugunov A I 
Published: February 2021

Abstract
Plasma screening can enhance the thermonuclear reaction rates significantly. The most pronounced effect takes place in the white dwarf cores and neutron star envelopes; there the enhancement factor can reach as tenths orders of magnitude. Here thermodynamically consistent description of this effect, which does not violate of the detailed balance principle, is discussed.
Dusty plasma environment near lunar surface
Authors: Dolnikov G G , Kartasheva A A , Bychkova A S , Shashkova I A , Kuznetsov I A , Lyash A N , Dubov A E , Popel S I , Zakharov A V 
Published: February 2021

AbstractThe dusty plasmas on the Moon are investigating through the direct detection of the dust particle fluxes on the lunar surface and through the measurements of the parameters of ambient plasma. The PmL instrument is the first device developed both to detect dust particles and to determine the characteristics of the plasma environment. The PmL instrument mounted on future Russian lunar missions Luna-25 and Luna-27 is described in the article. The suggested landing sites of the stations are situated nearby the Boguslavsky crater (nearby 70° south latitude of Moon). The values of the lunar surface potential, Debye length and electric field at a latitude of 70° were obtained in this paper. The distribution of the dust particles near the selected latitudes was also determined. A brief description of the methods for detecting the dusty plasma parameters near the lunar surface was suggested.
Dusty plasmas at the Moon: Effects of magnetic fields
Authors: Izvekova Yu N , Kassem A I , Popel S I , Morozova T I , Zelenyi L M 
Published: February 2021

AbstractProcesses associated with the presence of magnetic fields, which can be important in dusty plasmas on the Moon, are considered. Lower-hybrid wave processes under interaction of the magnetotail of the Earth with dusty plasma near the surface of the Moon are described. Lower-hybrid waves are excited due to the relative motion of magnetospheric ions and charged dust grains, which leads to the establishment of a well developed lower hybrid plasma turbulence. The effective collision frequency characterizing the anomalous loss of ion momentum due to ion-wave interaction, as well as the electric fields arising in the system are found. It is shown that the electric fields excited due to the development of lower-hybrid turbulence are somewhat weaker than those arising due to the charging of the lunar surface under the action of solar radiation. Nevertheless, they are quite significant to affect the electric field pattern above the Moon. The obtained effective collision frequencies should be taken into account when deriving hydrodynamic equations for dusty plasma ions with allowance for their turbulent heating. Problems related to the consideration of magnetic fields, which can be important for detailed study of the dusty plasmas at the Moon, are stated. The possibility of generation of wave motions in the near-surface lunar plasma should be taken into consideration when interpreting the observational data.
Phase coexistence of Yukawa liquid and bcc crystal by the Kofke integration method and a two phase approach
Authors: Reshetniak V V , Reshetniak O B , Filippov A V 
Published: February 2021

Abstract
The present work is devoted to the investigation of the melting line of the body centered cubic Yukawa crystal. Two different methods were applied: numerical integration of the Clapeyron–Clausius equation by Kofke algorithm and study of a equilibrium two-phase system, containing the both liquid and crystal phases. The values of the widely used in practice empirical phase transition criteria were calculated on the melting line. During the melting and crystallization the density of the Yukawa ensemble changes abruptly, which makes it impossible to obtain the self-similar solution of the equations of motion of the particles. As a result, using of a couple of dimensionless parameters lead to errors when calculating the melting line. However results of this paper show that these errors are comparable with the density change, which is less than 3% in the selected range of parameters.
Gas temperature spatial distribution in air corona discharge with plane comb of metal rod electrodes derived from schlieren images
Authors: Pinchuk M E , Lazukin A V , Stepanova O M 
Published: February 2021

Abstract
Gas temperature fields in the air corona discharge with a plane comb electrode system have been determined for the negative and positive polarities of the applied voltage. Highly sensitive schlieren technique used in the study allowed detecting a temperature change in tenths of a degree centigrade at room temperature of the gas flow. The obtained results suggest that the gas in the studied electrode system does not undergo heating at the given range of working parameters.
Near electrode voltage drops in high current high pressure discharges with fast energy input
Authors: Bogomaz A A , Pinchuk M E , Budin A V , Leks A G 
Published: February 2021

Abstract
A dependence of total near electrode voltage drops for high-current high-pressure discharges versus current rise rate into discharge in a range of 109–1012 A/s at initial gas pressure up to 200 MPa is presented. A new technique for the near-electrode voltage drops determination is proposed at conditions of the fast energy input. The technique is based on measuring the characteristics of a shock wave detaching from the discharge channel. Total near electrode voltage drops were increased with the current rise rates from around two hundreds to approximately ten thousand volts.
On plasma thermal spraying by the torch with divergent output nozzle
Authors: Son E E , Vetchinin S P , Gadzhiev M Kh , Yusupov D I , Tyuftyaev A S , Chinnov V F , Sargsyan M A 
Published: February 2021

Abstract
The analysis of the current state of the technological process and equipment for plasma coating of various powder materials has been carried out. To increase the processing efficiency during the deposition of ceramic materials and refractory alloys a novel technological scheme of plasma spraying with a powder feed axially to the cathode was proposed and preliminarily tested. Basing the plasma torch with an expanding channel of the output electrode its plasma-spraying version has been developed in which the sprayed powder was supplied both to the cathode or anode arc striking zone and to the current-free plasma jet. The electrophysical parameters of the argon plasma torch and the speed, size and temperature of particles of sprayed powder were investigated. It was shown that the particle velocity of Al2O3 powder depending on the gas flow and arc current reaches up to 100 m/s. The temperature of the powder particles in the vicinity of substrate at a current of 300 A approximately equals to 2400–2500 K.
Winter rye tolerance to low temperatures after seed treatment with surface barrier discharge
Authors: Gundareva S V , Lazukin A V , Dorofeev N V , Romanov A G , Krivov S A 
Published: February 2021

Abstract
In this work, the experimental results of surface barrier discharge plasma products affection to winter rye seed germination at the initial stage of growth and seedling tolerance to low temperatures are shown. The treatment was carried out for 10, 60, and 180 s in the plane-parallel electrode system with sinusoidal voltage of 2.7 kV with frequency 4.4 kHz applied to the strip electrodes at a distance of 5 mm from each other. It is shown that the treatment has no effect on seed germinating ability. In 180 s exposure treatment mode the stimulation of 3-day seedling shoot and root system length occurs. The freeze tolerance response of two-stage cold hardened seedlings grown from treated seeds shows that both the exposure of seed and the freezing temperature affect on the formation of positive response.
Limitations for lithium-ion batteries application in engine cold cranking
Authors: Fedotov A A , Popel O S , Kiseleva S V , Tarasenko A B 
Published: February 2021

Abstract
This research is devoted to the possibilities of using lithium-ion (Li-ion) batteries operation in engine cold start systems. Down-scale test specimen of LiC6–LiNiMnCo (NMC) and LiC6–LiFePO4 batteries coupled with supercapacitor module were tested in cold cranking mode. The charge currents between Li-ion battery and supercapacitor module are experimentally determined. The actual operating temperatures ranges of such batteries are determined in relation to local climate condition and compared with single lead–acid (Pb–acid) battery. The test results showed that significant limitations exist for current value both for Pb–acid and Li-ion battery. Coupling of supercapacitor module with Li-ion battery slightly improves the situation, but does not guarantee reliable three attempts for engine cold cranking.
Hybrid power-generating system with inertial energy-storage device
Authors: Balakin P D , Dyundik O S , Zgonnik I P , Fedorova M A 
Published: February 2021

Abstract
Detailed quantitative analysis of the energy and technical capabilities of various hybrid power-generating system combinations for a transport machine is performed. Prospective combination of compression ignition engine and inertial energy-storage device made by the superflywheel is shown. Engineering analysis of superflywheel parameters and features of the dynamics of the flywheel drive is given.
Combined drawing with extrusion of square box parts from a square billet
Authors: Bessmertnaya Yu V , Larin S N 
Published: February 2021

Abstract
The effectiveness of the technology of making square box parts can be ensured with the help of new technologies of deformation. This article considers a method combining drawing and extrusion of square box parts from a square billet, which allows achieving high economic indicators. The paper presents a study of the material flow and recommends a variant of the die design, which makes it possible to maximize the material utilization factor and rationalize the stamping technology.
The inertial compensation of the vibroactive force in the oscillating system
Authors: Burian Yu A , Sitnikov D V , Silkov M V 
Published: February 2021

Abstract
Actuators used in active vibration isolation systems of various types are either installed between the oscillating mass and the base, or next to the elastic-dissipative elements of a passive system. The actuator is usually controlled according to information from force-measuring devices. This significantly complicates the implementation of such systems. An active system is considered in which an electrodynamic drive (actuator) is used to compensate for vibroactive forces transmitted to the base. An electrodynamic drive is mounted on the base and controlled by accelerometers mounted on the passive system moving masses and the actuator. Straight-line controlled vibrations of the actuator moving mass provide inertial compensation of vibroactive forces on the base.
Justification and selection of rational parameters of drilling piles of engineering structures (on the example of soil conditions of the Chayandinskoye oil and gas condensate field)
Authors: Gruzin V V , Gruzin A V 
Published: February 2021

Abstract
Solving the problem of rational use of building materials in the development of new fields helps to minimize ineffective consumption of applied resources. The purpose of the conducted research was to develop recommendations on the selection of rational parameters of drilling piles for engineering structures constructed on soils of the Chayandinskoye oil and gas condensate field. Bearing capacity of a base of a vertically loaded friction pile was calculated by means of existing methods. Selection of specific bearing capacity as a target parameter characterizing the efficiency of building materials and bearing capacity enabled to give a comprehensive estimate of influence of structural parameters and natural factors on bearing capacity of bored piles in a foundation soil. A complex nature of pile geometric characteristics and ground conditions’ influence on the target parameter was established during theoretical calculations. For geotechnical conditions of the Chayandinskoye oil and gas condensate field, it was established that the use of piles with a bigger diameter of 0.4-0.5 m and the length of 6 m in soils with a temperature of no more than -2.0 °C and an ice content of no more than 0.2 is rational. Practical recommendations to use the results obtained during the performed studies can reduce inefficient costs of not only material, but energy and time resources in conditions of remote industrial facilities and logistics bases.
Layout Experimental Study of Dynamic Parameters of an Asymmetrical Self-Oscillating Hydraulic Drive
Authors: Kilunin I Yu , Sorokin V N 
Published: February 2021

Abstract
The article describes the developed asymmetric self-oscillating hydraulic drive and a stand for determining its dynamic characteristics. The design feature of the self-oscillating drive is that the switching of the working fluid in the cylinder cavity is made by two spools mounted inside the piston, while the working fluid is supplied to the spools by the hollow rod. The test stand is based on the principle of throttling the working fluid when it flows from one cavity of the loaded hydraulic cylinder to another. Stand tests of the developed drive have shown its reliability at different values of the piston stroke and at different operating pressures. The paper presents the characteristics of the drive when operating under load and at idle..
The efficiency analysis of the turbo air refrigerators for producing solid carbon dioxide from the boiler combustion products flow
Authors: Kondratev N V 
Published: February 2021

Abstract
The paper considers the efficiency analysis of the turbo air refrigerators for producing solid carbon dioxide from the boiler combustion products flow. The process of obtaining solid carbon dioxide in the turbo air refrigerating machine was modelled. A numerical study of the process and degree of solid carbon dioxide freezing in the turbo air refrigerating machine was performed. The range of the boiler power characteristics, where the most effective solid carbon dioxide freezing is possible within the technical specifications of the turbo air refrigerating machines, was determined.
Oscillations simulation of the vibration protection suspended load with a movable base
Authors: Korytov M S , Shcherbakov V S , Titenko V V , Pochekueva I E 
Published: February 2021

Abstract
Reducing the vibration effects on a human operator of a construction, road or handling machine is an urgent task, since the vibration loads produced by the internal combustion engine, vehicle engine interacting with the support surface microrelief, as well as the machine working attachment, adversely affect the machine operator and increase the machine parts and assemblies wear. The operator may develop occupational diseases caused by vibrations. In this regard, the research objective is to develop the mathematical apparatus simulating the dynamic processes of the passive vibration protection systems oscillations at the design stage. Therefore, the problem developing a mathematical model that makes it possible to study the oscillations of a single degree of freedom passive vibration protection systems with any given static characteristic, was solved. On the basis of the dynamic equations of a single translational degree of freedom vibration system describing the vibration protection suspended operator’s seat, the mathematical model solving the differential equation of the system oscillations taking into account the spring loaded mass displacements damping and three-segment static characteristics of the vibration isolation mechanism with limiters was simulated using the package Simulink of MATLAB system. An example of using the developed mathematical model for modelling vibrations of a spring-loaded mass under the sinusoidal external influences is given. The preset vertical displacements of the machine base, i.e. its base chassis act as the external influences. The examples of the obtained simulation results, namely the vertical displacements and accelerations of the spring-loaded mass are presented. The maximum accelerations of the spring-loaded mass were found out to significantly increase, when the machine base forced displacements amplitude exceeds by half of the horizontal section of the quasi-zero static characteristic of the vibration protection suspension.
Efficiency improvement of oil and gas facilities power supply systems
Authors: Kulbyakina A V , Ozerov N A , Batrakov P A , Savelyeva A I , Munin A P 
Published: February 2021

Abstract
Oil and gas refineries have a significant impact on the environment. The paper considers the main harmful substances formed as a result of the manufacturing processes occurring at the enterprises of the given industry and having a negative impact on the atmosphere, hydrosphere and lithosphere. The most significant sources of contaminants have been identified. The paper presents the most promising approaches described by both domestic and foreign authors for developing environmentally friendly, low-waste productions through the complex use of all the components of raw materials, energy resources and industrial wastes to ensure the required processing conditions. The authors developed and proposed the scheme of the power plant comprising the integrated waste disposal in oil and gas refineries, aimed at combining the processes of the thermal utilization of industrial wastes (combustible gases, effluents) with the processes of gasification and energy production (electricity, thermal energy, synthesis gas, water supply), reducing the specific consumption of the fuel gas for the energy resources production and waste disposal, improving the environmental safety and reliability of the facility.