bluuebunny/crossref_metadata_2025_split huggingface dataset:
The effect of Rashba spin-orbit interaction on persistent current in a chain of two Holstein-Hubbard rings
Authors: Smolkina M O , Popov I Yu , Chatterjee A 
Published: December 2019

Abstract
We study the persistent current in a chain of two coupled quantum rings threaded by an Aharonov-Bohm flux in the presence of electron-phonon and Rashba spin-orbit interactions. In the framework of the Holstein-Hubbard model, the equations for ground state energy, persistent current and Drude weight were derived. Obtaining of the expression for the ground state energy allowed us to obtain the persistent current by a conventional way (differentiating). The influence of the magnetic flux and the Rashba spin-orbit interaction on the ground state energy, persistent current and Drude weight was studied numerically.
Filling of In(Ga)P/GaInP quantum dot electron states detected by microphotoluminescence
Authors: Romanova A Yu , Belyaev K G , Buriak P A , Vlasov A S , Kalyuzhnyy N A , Mintairov S A , Salii R , Lebedev D V , Rakhlin M V , Smirnov V I , Toropov A A , Bogdanov A A , Ramezanpour S. , Mintairov A M 
Published: December 2019

Abstract
Microphotoluminescence (μPL) spectra of single In(Ga)P/GaInP quantum dots (QD) were investigated. Measurements were carried out at different optical pump power and at different electric field with constant optical pump. Filling of electron s-, p-, d-states was observed. Quantum confinement Stark effect (QCSE) was detected. Obtained PL life times of s-, p- electron states were 0.5 ns and 0.4 ns respectively. From spectra it is clearly seen that QDs have weak quantum confinement (hω0
∼4-8meV).
Effects of collisions on the stability properties of plasma diodes
Authors: Pramanik S , Kuznetsov V I , Chakrabarti N 
Published: December 2019

Abstract
Stability features of the Pierce diode steady states are investigated in the presence of electron-background-particle collisions. The regime without electron reflection from the potential barriers is studied. Steady states are obtained analytically by means of the Lagrangian fluid description. Employing the first order perturbation theory, the relevant dispersion equation is derived. Both aperiodic and oscillatory solutions of this equation are found and their properties are studied.
Radiation from the shock wave front caused by its movement in plasma
Authors: Baryshnikov A S , Saharov V A , Baryshnikov I A 
Published: December 2019

Abstract
In the work the possibility of electromagnetic radiation of shock wave in collisional plasma is theoretically explored, radiation which stimulated specifically by movement of the shock wave. Radiation occurs across the shock wave movement and for experiments in cold plasmas – at frequency of high-frequency radiation.
Numerical study of the vortex structure influence on heat transfer in the supersonic flow past a plate and a blunt fin junction
Authors: Kolesnik E V , Smirnovsky A A 
Published: December 2019

Abstract
Viscous-inviscid interaction and heat transfer in supersonic 3D laminar flow past a fin-body junction is investigated by means of numerical simulation. A laminar flow regimes at the freestream Mach number equal to 4, 5 and 6 are considered. Specifics of vortex structures and shock wave pattern in the interaction region are discussed. The Mach number effect on the predicted size of separation zone upstream of the fin and the plate Stanton number distribution are analysed. For the Mach number of 5, the temperature factor influence on heat transfer is investigated.
Supersonic plasma flow injection across the magnetic arch in a table-top laboratory setup
Authors: Viktorov M E , Golubev S V , Vodopyanov A V 
Published: December 2019

Abstract
The dynamics of the plasma deceleration process during the injection in the tridimensional magnetic arch formed by magnetic coils is studied. The effect of the magnetic field lines deformation in the apex is experimentally observed when the plasma flow stops in the region where its ram pressure equals the magnetic pressure. The propagation direction of the plasma flow is changed as a result of plasma flow interaction with the magnetic arch. The plasma flow velocity along magnetic field lines is experimentally measured and is in a good agreement with numerical estimates of Alfven velocity. The transition layer is formed with a transverse size of the order of ionic inertial length as a result of the interaction of the plasma flow with the magnetic field. Non-thermal microwave emission of plasma is experimentally detected in the electron cyclotron frequency range during plasma deceleration process. The electromagnetic spectrum at frequencies of 1–2 GHz has been studied in detail.
Kinetic ionization and recombination coefficients in the dense semiclassical plasmas on the basis of the effective interaction potential
Authors: Shalenov E O , Seisembayeva M M , Dzhumagulova K N , Ramazanov T S 
Published: December 2019

Abstract
In this paper, the ionization and recombination coefficients of dense semiclassical hydrogen plasma on the basis of the effective interaction potential have been investigated. For this goal the Bohr – Lindhard method and method phase function have been applied to obtain the electron capture and ionization cross sections. The electron capture cross section has been calculated in the framework of the perturbation theory. The effective interaction potential, which takes into account the screening effects at large distances and quantum diffraction effects at short distances, was used. The results of the investigation show the behaviour of the calculated kinetic coefficients with a change in the plasma parameters: the ionization coefficient decreases with increasing density and (or) coupling parameter while the recombination coefficient increases.
Numerical study of dissolved gas release induced by cavitation in a high speed channel flow
Authors: Iben U , Makhnov A , Schmidt A 
Published: December 2019

Abstract
Cavitation often leads to performance degradation of hydraulic devices and, in some cases, to damage of the elements of their constructions (cavitation erosion). Liquids, that are used in technical devices, often contain dissolved gas. Such liquids are of particular interest because cavitation causes release of the dissolved gas into the cavities which can significantly change the flow structure. Mathematical models based on detailed description of all the underlying mechanisms still need development. The approach that was proposed and analyzed in the present study combines a simplified equilibrium model of liquid-vapor phase transition with a non-equilibrium diffusion model describing gas release process. The distributions of the hydrodynamic parameters and the gaseous phase fraction obtained show significant influence of the dissolved gas on evolution of cavitation structures. This is in qualitative agreement with experimental observations regarding the main features of cavitating flows and the behavior of the degassed air. It demonstrates robustness of the proposed simulation algorithm which means that its further development can be a promising way to create a universal model for reliable quantitative prediction of dissolved gas release.
Charged particles distribution ahead the shock wave front in the electrode discharge plasma
Authors: Baryshnikov A S , Basargin I V , Bezverkhnii N O , Bobashev S V , Monakhov N A , Popov P A , Sakharov V A , Chistyakova M V 
Published: December 2019

Abstract
Experiments on the interaction of a shock wave with a glow discharge were conducted. It was established that the shock wave propagation is accompanied by a change in the potential of the discharge plasma. The varying potential in the glow discharge plasma causes a distortion of the double probe current. A method is proposed for correcting probe measurements, which consists in the joint processing of two signals obtained in separate experiments with different surface areas of the double probe negative electrode and other conditions being equal. Using this method, the ion current and the change in the space potential are determined. The ion current, determined by the concentration of charged particles, remains unchanged until the shock wave arrival to the measurement point.
Criteria of computational grid generation for turbulence models taking into account laminar-turbulent transition
Authors: Matyushenko A A , Stabnikov A S , Garbaruk A V 
Published: December 2019

Abstract
Criteria of structured and unstructured mesh generation for turbulence models taking into account laminar-turbulent transition were developed using flat plate boundary layer flow. It is shown the first near wall cell should be placed in the viscous sublayer in the transition region and stretching factor should not exceed 1.4. For the unstructured meshes all the boundary layer should be covered by prismatic layers. The results of the prediction of the flow around a NLF(1)-0414F airfoil show that the use of relatively coarse meshes provide acceptable accuracy of the solution.
Peculiarities of the magnetic field distribution in the railgun channel
Authors: Popov Pavel , Poniaev Sergey , Kurakin Roman , Tverdokhlebov Konstantin , Reznikov Boris 
Published: December 2019

Abstract
The measurement of the magnetic field induction in the railgun channel was carried out. The influence of the conductivity of the rail material on the efficiency of magnetic field generation using external coils was evaluated. The distribution of the pulsed magnetic field corresponding to the experimental conditions is calculated. The evaluation of the applicability of the used model for the simulation of railgun for various types of boundary conditions in the passive circuit was carried out.
Effect of thermal modification of saponite-containing material on energy properties of its surface
Authors: Drozdyuk T A , Ayzenshtadt A M , Frolova M A 
Published: December 2019

Abstract
Preliminary experimental studies have shown the fundamental possibility and feasibility of using saponite-containing material (SCM), extracted from the pulp of the tailings dump of industrial enrichment of ores of the diamond deposit named after M.V. Lomonosov, as a mineral binder for mineral wool insulation. The technology of the production of mineral wool composite was based on the effect of high temperatures (up to 1200 °C) on the raw mix consisting of SCM as a binder and basalt fibers as a fibrous aggregate. However, the new properties of the saponite-containing material after thermal modification have not been investigated. Therefore, in this study, we studied the effect of the temperature of modification of the saponite-containing material on the criterion for evaluating the energy properties of the surface (the Hamaker constant). The experiments have shown that the maximum value (2.78·10−20 J) of the Hamaker constant is observed in the modification temperature range from 100 to 200 °C, then a decrease in the value of this criterion to a temperature of 600 °C is observed, and, there is a stabilization of the Hamaker constant in the range of temperatures from 700 °C to 1000 °C, the average value of which was 1.23·10−20 J.
Wire-free method of measurements of weak electrostatic values under stationary and dynamic conditions
Authors: Makhmudov Kh F 
Published: December 2019

Abstract
Usage of a developed and updated electrometer (EM) allows one, first, to obtain new information on physical properties of materials (glasses and other solids) as well as on the manifestation of the properties in the field of mechanical forces. Second, the applicational significance of such researches could be also important when designing new nondestructive methods of material defects controlling and procedures of their removal. The EM is up to measure both slowly and rapidly varying electric potentials at some distance from a target. EM allows one measure relaxation times of charges in dielectrics, which do not exceed the time constant of discharge time of the amplifier under stationary conditions. Owing to the developed scheme of the EM input circuit, the input capacity of amplifier was decreased with a corresponded increase of its sensitivity.
Numerical simulation of modern methane emissions and their influence on climate variability and gas composition of the Arctic atmosphere
Authors: Cherepova Maria , Smyshlyaev Sergei 
Published: December 2019

Abstract
The impact of Arctic methane hydrate emissions on the gas composition and climate is studied by using a chemistry-climate model. Model runs are carried out using two methane emission scenarios (with Arctic methane emissions increased by 5 and 10 times, respectively, relative to the reference level of emissions of 10 Tg/year). The methane hydrate emissions have a strong impact on the concentrations of methane and other gases. Temperature distributions in the polar and nonpolar regions in the troposphere and stratosphere are obtained. The influence on the climate variability and gas composition of the atmosphere is estimated.
A simulated distribution of Siberian river runoff in the Arctic Ocean
Authors: Golubeva E , Platov G , Iakshina D , Kraineva M 
Published: December 2019

AbstractContinental runoff is one of the major sources of the Arctic freshwater budget. As is generally known, it influences water column stratification and maintains Arctic halocline, which isolates the sea ice and the cold, fresh upper layer from the warmer, saltier Atlantic waters of the Arctic Ocean. An increase in river runoff was observed in recent years. It is suggested that this will have an impact on Arctic water mass transformations. However, few details are known regarding river freshwater export to the Central Arctic Basin. It is assumed that river water pathways in vast shelf seas and deep basins are closely related to atmospheric variability. In this study, we use three-dimensional coupled regional ocean-ice model simulations forced by atmospheric reanalysis data to investigate the change in Siberian rivers freshwater pathways in the Arctic Ocean due to the variability of atmospheric dynamics. A numerical experiment with an increasing runoff of the largest Siberian rivers is carried out. The consequences of adding freshwater to particular regions of the Arctic Ocean are analysed.
Simplified method for monitoring of cumulus clouds by using global horizontal irradiance
Authors: Zuev S V , Krasnenko N P 
Published: December 2019

Abstract
A simplified method for monitoring of cumulus clouds which is based on a variational analysis of a time series of measured global horizontal irradiance is proposed. A distinctive feature of the technique is that it does not use an amplitude analysis of the time series and, as a result, there is no need to use any clear-sky model.
Real-time microscale modeling of thermal comfort conditions in Moscow region
Authors: Perkhurova A A , Konstantinov P I , Varentsov M I , Shartova N I , Samsonov T E , Krainov V N 
Published: December 2019

Abstract
Urban climate comfort is an indicator of a set of parameters, such as temperature, humidity, and solar radiation for a person’s sensation of being favorable to being outdoors or indoors. In this study, an attempt to develop a technology of real-time prediction of thermal comfort conditions in urban landscape is described (based on the example of Moscow State University campus). For this, the authors used a RayMan model-based algorithm for calculating three most popular worldwide comfort indexes. In the scripting method, predictive data of the Canadian global model meteorological parameters are automatically transferred to the RayMan-model (with an implementation of the unique thermal and radiation properties of the Moscow State University campus landscape) by using an autoclicker software. For the convenience of perception of the information, the results of calculations are visualized on the basis of a free web mapping service. Thus, the main idea of the work is that any user with minimum expenditure of his time resource and without knowledge of the model’s work can launch the program and receive an individual forecast of comfort conditions for the next few hours in a visually understandable format. It is suggested that the developed methodology will be used for calculations on projected areas to identify the safest construction option. Such realtime forecasting will continue to be of particular importance for urban infrastructure.
Effect of shear rate in high shear mixing process on the structure of cassava starch granule and reducing sugar product
Authors: Puspasari F , Airlangga B , Trisanti P N , Sumarno  
Published: December 2019

Abstract
Cassava starch is one of the biopolymers which can be degraded to many useful products such as reducing sugar, non-reducing sugar and modified starch. However, it has a solid granule structure that can inhibit its degradation process. High shear mixing (HSM) is a well-known method for dissolving biopolymers. Shear effect of HSM created by a narrow slit between rotor and stator which can be increased by the increase of rotational speed. By increasing its shear effect, HSM is able to cut the glycosidic bond of starch to produce reducing sugar. Therefore, this study aims to study the effect of high shear rate to granule structure and reducing sugar product. The HSM process was carried out on the suspension of cassava starch with a concentration of 1/20 (g/mL) for 15 min at various stirring speeds (5000-15000 RPM). Products produced from the process are separated between solid and liquid for analysis. Solid products were analyzed using Scanning Electron Microscopy (SEM), Particle Size Analysis (PSA), and Viscometer Ubbelohde. While liquid products were analyzed using UV-Vis Spectrophotometry with the DNS method. Based on the experimental results, HSM produced reducing sugar up to 0.1972 mg/mL. Granule breakage was also observed by SEM and increasing of the nanoscale granule.
Research on Maneuvering Trajectory Tracking Accuracy of Target Missile Based on Feedback Linearization
Authors: Yu Jifeng , Yang Suochang , Zhang Yunwei 
Published: December 2019

Abstract
Aiming at the trajectory tracking accuracy of missile target, a trajectory tracking guidance law is designed based on feedback linearization theory and linear quadratic optimal control theory, and the tracking accuracy of the designed trajectory tracking guidance law under different maneuvering trajectories is tested. The motion equations of missiles are typical non-linear motion models, so feedback linearization is introduced as an exact linearization method, and the definition and necessary and sufficient conditions of feedback linearization theory are listed. Firstly, the non-linear equations of the longitudinal motion of target missile are established, and the feedback linearization method is used to linearize the non-linear model accurately. Then, the linearized model is designed by using the linear quadratic optimal control theory, and a target trajectory tracking guidance law is obtained. Finally, given gust disturbance and different maneuvering trajectories, the designed trajectory tracking guidance law is simulated, and the tracking accuracy of the guidance law is studied by changing the control coefficient. The results show that the trajectory tracking guidance law based on feedback linearization has excellent trajectory tracking ability, good tracking accuracy and strong anti-jamming ability under different maneuvering trajectories.
Research Progress in the Chemical Modification of Eucalyptus
Authors: Qin Yinluan , Long Dajun , Li Jianzhang 
Published: December 2019

Abstract
Eucalyptus, a main fast-growing tree species for plantation in southern China, has remarkably contributed to balance the supply and demand of wood in the country. Eucalyptus is mainly used for processing wood-based panels, including fiberboards, plywoods, and chipboards, with low added value because of its poor dimensional stability and susceptibility to cracking and deformation. In this paper, the mechanisms, merits, and demerits of wood acetylation, furfurylation, and resin-related and thermal modifications were summarized.The research status of the chemical modification of eucalyptus was analyzed, and existing problems and future research directions of eucalyptus modification were stated briefly.
Research on Green Transition Development of China’s Electric Vehicle Industry in the New Era Guided by Low Carbon Economic Theory
Authors: Song Shuang , Liu Shude , Chen Zhongyou , Guo Cunzhen 
Published: December 2019

Abstract
The shortage of petroleum resources and the aggravation of environmental pollution at present. There is no doubt that China’s automotive industry has put forward higher requirements for energy conservation and environmental protection. How should China base itself on its own situation? To formulate a reasonable technological development route and industrialization strategy to stimulate the development of electric vehicle industry. It is an urgent problem to be solved at present.
Acoustic Diagnosis Method for Engine Failure
Authors: Hu Ziyang 
Published: December 2019

Abstract
The engine is an important equipment in modern society, and its failure diagnosis method has always been valued and continuously developed. As a non-contact method, the failure acoustic diagnosis method has advantages that are unmatched by other methods. This thesis introduces the current development of acoustic diagnosis technology for engine failure, and introduces the commonly used methods: wavelet analysis, empirical mode decomposition and acoustic imaging, and summarizes the development trend of future engine failure acoustic diagnosis technology.
Research on Intelligent Diagnosis Technology of Emergency Diesel Generator in Nuclear Power Plant Based on New Monitoring Method
Authors: Zhou Yong , Liang Yongfei , Li Rui 
Published: December 2019

Abstract
As the emergency power source of nuclear power plant, the emergency diesel generator sets need to provide power for the safety system of nuclear power plant after all external power sources of nuclear power plant are lost, to ensure the safe shutdown of nuclear power plant and prevent the leakage of radioactive materials to the environment. In view of the critical role of emergency diesel generator sets in ensuring the safe operation of the power station, high reliability is needed. Therefore, how to accurately monitor the state of diesel engine and how to diagnose the faults has become an urgent problem to be solved. In this paper, status monitoring system for diesel engine is designed and developed based on LabVIEW and new monitoring method to realize real-time and continuous collection during the operation of the diesel engine, intensive collection during the alarm process, and data display and storage. It can provide data support for fault diagnosis. The operation results show that the system has high reliability and meets the requirements of field inspection, regular test and fault analysis.
From spacetime to space and time: a reply to Markosian
Authors: Le Bihan Baptiste 
Published: December 2019

AbstractIn a recent article, Ned Markosian gives an argument against four-dimensionalism understood as the view that time is one of four similar dimensions that constitute a single four-dimensional manifold. In this paper, I show that Markosian attacks a straw man as his argument targets a theory known to be false on empirical grounds. Four-dimensionalism rightly conceived in no way entails that time is identical to space. I then address two objections raised by Markosian against four-dimensionalism rightly conceived.