bluuebunny/crossref_metadata_2025_split huggingface dataset:
Fission fragments and energy spectra of primary electrons in a fissioning plasma
Authors: Shapiyeva A E , Kunakov S K , Son E E 
Published: November 2019

Abstract
Some isotopes like 3He, 23BUF6 gases irradiated by thermal neutron flux may produce partially ionized plasma with the presence of fast particles like protons, tritium or heavy fission fragments. If a sample with 3He gas sets in thermal neutron flux, the helium atoms may born highly energetic particles: protons and tritium nuclei, which create in their own turn primary electrons and their other successive generations.
In the present paper Boltzmann kinetic equation for plasma, created by volume source of ionization is developed and solved for special cases, like presence of external electric field, strong enough to cause Townsend ionization. The ways of possible existing of highly energetic electrons accelerated by strong electric field energy also thoroughly discussed. Statistical approach based on the Monte Carlo technique including definition of self-consistent electric field formed by boundary conditions and nuclear induced plasma internal properties coupled with direct Boltzmann formalism also was developed and discussed. Thus the outbreak or the time explosion of the energy distributions of all fast particle including primary and secondary electrons are calculated in the programming complex as a function of time from 10 ps to 10 ns and for different neutron flux pulses and neutrons homogeneous spatial distribution. Non-linear problems such as an electron–ion recombination and successive generation of secondary electrons and electron queues are solved by Monte Carlo technique and comprehensively described. Detailed calculations show that so called runaway electrons are not appearing in nuclear induced plasma and whatever strong external electric field applied, there is no way to supply them relativistic energy and create so called runaway electrons. The appearance of electrons with an energy around MeV is possible when electrons (beta electrons) are born within nucleus due to internuclear transformations of up and down quarks affected by neutrinos oscillations. It takes place in nuclear fission process provoked by neutrinos and antineutrinos Reines et al (1960 Phys. Rev. 117 159). Time dependent spectra of primary electrons as well as their successive generations are calculated and compared with existing experimental data and developed for nuclear induced Boltzmann kinetic equation solutions. It is also should be noted that the bremsstrahlung radiation or braking radiation can not be treated as a type of force (friction force). It is clear that the transformation of kinetic energy into electromagnetic energy is a unique phenomenon and if it exists while fast electron is stopping in the medium, then there should be the reversed process, when electron gains its kinetic energy from surrounding electric field.
Energy of intermolecular forces in liquid halogenalkanes and their binary mixtures
Authors: Neruchev Yu A , Korotkovskii V I , Ryshkova O S 
Published: November 2019

Abstract
The paper analyzes the relation that allows studying the peculiarities of intermolecular forces and the nature of the structure of condensed substances with an atom-atom interaction mechanism. The estimate of the energy of intermolecular forces of saturated hydrocarbons and their halogen-substituted according to the data on their thermophysical properties and data on the individual characteristics of atomic centers are presented. A formula for predicting the dispersion constants of halogen-alkanes and their binary mixtures that accordance with experimental data is proposed.
Experimental study of thermophysical properties of W-Re alloy at high temperatures
Authors: Senchenko V N , Belikov R S 
Published: November 2019

Abstract
This article presents data on thermophysical properties of a tungsten-rhenium alloy W-Re (27 at. % of Re) in the temperature range of 2400–3100 K. Data on the thermal expansion and specific electrical resistance of this substance at premelting region are obtained, and the emission spectra of the alloy are obtained at high temperatures.
Structure and properties of YBCO before and after the short-term exposure of the plasma flow
Authors: Rabadanova A E , Gadzhimagomedov S Kh , Palchaev D K , Gadzhiev M H , Ragimkhanov G B , Demirov N A 
Published: November 2019

Abstract
The results on the structure and electrical resistance of the porous YBa2Cu3O7–δ
nanoceramics before and after plasma treatment are shown. It is shown that after exposure to high-enthalpy argon plasma flow, the structural, stoichiometrical and superconducting properties in the volume of this ceramics change slightly. An amorphous layer forms on the surface, the mechanical strength of the inter-granular bonds of which becomes higher than for the material in the bulk.
Experimental determination of destruction of thermally unstable substances
Authors: Dzhapparov T A-G , Bazaev A R 
Published: November 2019

Abstract
Different methods of thermal stability determinations are reviewed. The process of thermal decomposition of aliphatic alcohols and their aqueous mixtures in the range of temperatures 583.15–663.15 K was studied using the method of isothermal pressure increasing in a closed system. The decomposition points (Td) alcohols dissolved in water are obtained depending on their concentration. The changes of thermal coefficients (isothermal coefficient of compressibility kT, coefficient of cubical expansion α and thermal coefficient of pressure β) and main thermodynamic properties (Cv
, Cp
, H, S, U, F, G) of studied mixtures depending on isothermal pressure increasing during the thermal decomposition of alcohols were calculated.
Effect of dynamic screening on the electron capture process in nonideal plasma
Authors: Shalenov E O , Seisembayeva M M , Dzhumagulova K N , Ramazanov T S 
Published: November 2019

Abstract
In this paper, the process of electron capture in nonideal plasma has been investigated. For this goal the Bohr-Lindhard method has been applied to obtain the electron capture cross section. All calculations have been done in the framework of the trajectories of incident electron near hydrogen ion (proton) obtained by the numerical simulation of the equations of motion. The effective interaction potential, which takes into account the static or dynamic screening effects at large distances and quantum diffraction effects at short distances, was used. The results of numerical calculations of the electron capture radius, differential and total cross section for different values of the density parameter and velocity are presented. It is shown that dynamic charge screening increases the capture cross sections in comparison with static screening.
Study of the absorption spectrum of the thin film of titanium monoxide in the mid-wavelength IR range
Authors: Skryabin A S , Vesnin V R , Tsygankov P A , Chirkov A Yu , Vlasov E Yu , Ostanko D A 
Published: November 2019

AbstractThe paper presents experimental study of IR absorbance of the thin TiO film (with the thickness of 600 nm) on the glass substrate. The titanium monoxide (TiO) film was prepared with the ion-beam scattering. The film was characterized by XRD, FTIR, SEM etc. IR absorption spectra for the film and the substrate were measured. It was shown that the average absorbanceĀof the pure glass substrate isĀ≈ 0.08 in the wavelength range λ = 2.5 … 15μm. For the TiO film it was obtained thatĀ≈ 0.38 in the same λ range.
Investigation of temperature dependence of drilling mud viscosity with silica nanoparticles addition
Authors: Pryazhnikov M I , Mikhienkova E I , Minakov A V , Rudyak V Ya 
Published: November 2019

Abstract
An experimental study on the effect of silica nanoparticles addition on the viscosity of water-based mud at different temperatures was carried out. The mass concentration of clay was 5%, and the nanoparticles concentration varied from 0.5wt% to 3wt%. The nanoparticle size was 10 nm. Viscosity coefficient measurements were carried out in a wide temperature range.
Experimental research on the thermal conductivity of the contact pads for electronic equipment
Authors: Sukhikh A A , Kuznetsov K I , Skorodumov S V 
Published: November 2019

Abstract
Currently, soft contact pads of foreign manufacturers of SIL-Pad, Gap-Pad and Bond-Play series are widely used to transfer heat flows in electronic equipment elements. Within the framework of import substitution programs, the technology of manufacturing analogs of heat-conducting gaskets from local raw materials is being developed. The main thermal property that determines the performance of gaskets is the thermal conductivity. The article describes the installation, technique and methods of conducting and processing the results of experiments developed for its determination. The analysis of the obtained experimental data is made.
Infrared system for thermal resistance measurement of microobjects
Authors: Senchenko V N , Konovalov P A , Kapustin D I , Ilichev M V 
Published: November 2019

Abstract
The original measuring system and method of temperature fields measuring of integrated circuits chips for controlling of thermal resistance between a chip and its case under production conditions is presented. The infrared system allows temperature measuring over the range (40-150)°C, and also allows to spot small gains of IC chips temperature around 1°C. The developed system based on infrared microbolometric matrix and allows controlling of integrated circuits chips temperature fields with the high spatial resolution up to 15 microns.
Purification of fused alumina by high temperature calcination in vacuum
Authors: Belyaev G E , Grigorenko A V , Vlaskin M S , Lipatova I A , Shkolnikov E I , Zhuk A Z 
Published: November 2019

Abstract
The aim of present study was the investigation of purification efficiency of industrial white fused alumina at high-temperature calcinations, in vacuum. Three powder samples of alumina with different initial purity and particle size distribution were studied. The impurities amount in the white fused alumina powder decreased by factor 10 after vacuum calcinations. White fused alumina samples were almost completely cleared of Na, Mg, K, Mn, Cu and Zn. The iron content in the studied samples decreased by factor 8–10. Comparison of the granulometric composition and specific surface area of samples, showed that samples look like sets of porous grains with the average sizes between 16–60 μm. In turn, porous grains are composed of dense micro-particles with a characteristic size of 0.4–0.7 μm. The specific surface area of grains lies in the range 2.8–3.3 cm2/g. Relatively high rate of purification takes place due to porous structure and high surface area of the samples.
The effect of phonon diffusion on heat transfer
Authors: Khvesyuk V I , Qiao W , Barinov A A 
Published: November 2019

Abstract
The work is devoted to the development of a tool that allows simulating diffusion in structures where phonons play the main role in the heat transfer (dielectrics, semi-conductors). It is shown that the nature of phonon interaction is fundamentally different from the interactions in classical gases. For the first time, a method for calculating the diffusion of phonons, that takes into account all the important features of their interaction with each other, is presented. A computer simulation of phonon diffusion for a silicon sample in a two-dimensional formulation was carried out. It is shown that the nature of phonon diffusion differs from the classical Brownian diffusion.
Modeling the alumina cleaning by means of high temperature evaporation into vacuum
Authors: Ivanov P P , Vlaskin M S , Zhuk A Z 
Published: November 2019

Abstract
Considering a porous granule to be an ensemble of solid micro-particles the mathematical model is developed for the high temperature vacuum cleaning of alumina from ferrous impurity. Three parts of the process are identified: the diffusion in solid, the evaporation into vacuum and the filtration through pores into outer space. The model found to be consistent with available experimental data. Analytical solutions on the level of solid micro-particles might be instrumental for the treatment of experimental data.
Deformation behaviour of aluminium nanocrystals under shock-wave loading
Authors: Vlasova A M 
Published: November 2019

Abstract
Nonequilibrium process of shock-wave loading of aluminum nanocrystals were investigated numerically under uniaxial stress conditions using molecular dynamics simulations (MD). Deformation curves, time dependence of strain rate and the change in potential energy were constructed. Calculated properties of aluminium using embedded atom interatomic potential are compared with each other. Relationship between the calculated characteristics are discussed. The behaviour of deformation curves for two different aluminium nanosrystals is explained. The problems of modeling the deformation hardening of aluminum nanocrystals are considered.
Interaction of methane with thermal carbon dioxide plasma obtained in the AC plasma torch
Authors: Subbotin D I , Popov V E , Safronov A A , Popov S D , Surov A V , Kuchina J A , Obraztsov N B , Serba E O , Nakonechny Gh V , Spodobin V A 
Published: November 2019

Abstract
The article discusses a new method for producing synthesis gas using an ac electric arc. The relationship between the electrical parameters and the energy characteristics of the process was established: with an increase in carbon dioxide concentration in the electrode zone, the hydrogen concentration increases. This leads to an increase in the plasma torch power, which can be used to adjust the chemical process.
Viscosity and density of vacuum oils for diffusion pumps
Authors: Sagdeev D I , Gabitov I R , Fomina M G , Alyaev V A , Minkin V S , Abdulagatov I M 
Published: November 2019

Abstract
Current paper represents the results of viscosity and density measurements of vacuum oils for diffusion vacuum pumps. Vacuum oil samples are represented by the following brands: VM-1S, LEYBONOL LVO 500 and Alcarin-D24. All the measurements have been carried out at atmospheric pressure: viscosity has been measured by the capillary method in the temperature range from 293 K to 373 K, and density has been measured by the pycnometer and hydrostatic weighing methods in the temperature range from 293 K to 473 K.
Isochoric heat capacity and PVT properties of n-heptane – water binary azeotropic system
Authors: Ibavov N V , Mirskaya V A , Nazarevich D A 
Published: November 2019

Abstract
The isochoric heat capacity and the pressure of n-heptane – water binary layering system were measured using the high-temperature adiabatic calorimeter-piezometer method. Characteristic properties of a change in the temperature dependences of the heat capacity and the pressure along the isochores were revealed in a region of phase transitions. These features allow for fixing the azeotropy state in the system and for estimation of the influence a polar component (water) on a change in the azeptrope state temperature.
Exhaust composition at laser ignition of combustible gas mixtures under controlled conditions
Authors: Anishchanka Y V , Loktionov E Y 
Published: November 2019

Abstract
One of the main advantages of laser ignition is the ability to ignite lean combustible mixtures, resulting in obvious economy and reduction of harmful emissions, primarily NOx. Experimental data on exhaust composition are presented in the literature very poorly. As a rule, the studies were not of a systematic nature, considered only very specific conditions of combustible mixtures exposure and composition (mainly methane-air), and were obtained for experimental piston engines, the design and operational features of which could significantly affect the result. We suggested that in order to obtain a starting point for further optimization, a study of exhaust composition should be carried out under conditions of minimal impact of the engine design. For this purpose, an experimental stand was created, which allows to investigate the laser ignition of combustible mixtures of different composition in wide pressures range. We studied the laser ignition of gas mixtures based on butane with fuel-air coefficients ϕ ∼ 0.8 – 1.2, in pressure range p ∼ 1 – 3 bar, ignited by radiation of the the nanosecond Nd:YAG laser. The exhaust composition was analyzed by O2, CH, CO, CO2, NOx. Correspondence of the obtained results known from other experimental and theoretical works is analyzed.
Interlaminar tensile strength for composite materials made by additive manufacturing
Authors: Paredes A C , Bohórquez O , Pertuz A , Rueda Y , González-Estrada O A 
Published: November 2019

AbstractThe low interlaminar tensile strength of fiber reinforced composite materials presents serious challenges in the design of structures with a considerable radius of curvature, which is commonly found in a wide range of fields such as aeronautics, civil engineering, maritime industry, energy industry, among others. The objective of the present research was to analyze the interlaminar tensile strength, in the interlaminar layer of a material composed of fiberglass as reinforcement in nylon matrix, using a curved beam elaborated by additive manufacturing. To achieve this, tests were carried out according to ASTM Standard, and to determine which parameters significantly influence the failure of the composite material, variations were made in the thickness of the test specimens, which were manufactured following the criteria of the standard. The results obtained allow the assessment of interlaminar tensile strength and specimen behavior after failure.
Shape optimization of a control arm produced by additive manufacturing with fiber reinforcement
Authors: Chacón Santamaría P A , Sierra A , González Estrada O A 
Published: November 2019

Abstract
Additive manufacturing makes possible to overcome the limitations of subtractive manufacturing and supposes a transformation with respect to the traditional processes, allowing to manufacture complex geometries by controlled deposition of material. In the automotive industry, the application of continuous fiber reinforcement, in combination with shape optimization for additive manufacturing, can produce parts with higher mechanical performance. This paper reports the shape optimization problem of a suspension control arm to be produced by additive manufacturing with fiber reinforcement, using finite element analysis. First, the current material, loading conditions and constraints to which the control arm is subjected were determined, considering its traditional design. Then, a numerical model of the part was developed considering its current material and shape to obtain the total deformation and von Mises stress distributions. Afterwards, the new material model was defined, and the shape optimization was performed with the goal of maximizing stiffness. Finally, the results from the optimization process were validated by manufacturing and testing the part.
Adhesive joints for composite materials produced by additive manufacturing
Authors: Casas Pulido A F , Bohórquez O , González-Estrada O A , Quiroga J , Pertuz A 
Published: November 2019

AbstractComposite materials are joined in many occasions with adhesive joints due to the condition of the materials, the ease of repair, the loading conditions, the affectation by corrosion and chemical attacks. However, the efficiency of these bonding schemes is related to multiple factors, among them, the length and the width of the adhesion zone and the thickness of the adhesive. In this work, we analyze the factors associated with the surface contact of the substrates. We define a numerical model using the finite element method and study the parameters related to the physical condition, considering optimal results based on the data of the strength provided by the suppliers of adhesives.
Interlaminar tensile strength of the composite of African palm oil bunches rachis fibers and epoxy matrix
Authors: Pinto-Flórez R A , Bohórquez O , González-Estrada O A , Vasquez L , Pertuz A 
Published: November 2019

Abstract
The organic composite materials are very competitive due to their low density and good flexibility by design, suitable for certain working conditions such as installations where high mechanical strength at a low weight is required. Additionally, they contribute to the environment by taking advantage of organic components that are currently waste. The composite proposed in this work consists of an epoxy matrix reinforced with African palm rachis fibers. The specimens were manufactured under the manual rolling process due to the nature of the reinforcement. Moreover, the variation of the interlaminar tensile strength was investigated, using a four-point flexion testing and varying the thickness of the specimen in order to evaluate the feasibility of the organic reinforcement. The experimental analysis was performed with a curved beam geometry and low flexion.
Analysis of the adhesion of titanium and carbon-diamond coatings on 3D printed textured surfaces
Authors: Zapata A , V-Niño E D , Endrino J L , Fernández-Martínez I , Díaz Lantada A , Martinez M , Pertuz A 
Published: November 2019

Abstract
The importance of coatings in engineering has been predominant throughout the development of the new industrial era. The competitiveness of the field has led to the development of better materials that achieve superior properties. The purpose of this research is evaluating the adhesion to the surfaces coated by magnetron sputtering technique. The adherence quality of the deposited coatings on specimens was evaluated adhesion by scratch and indentation tests guided according to standards, using the Tribolab UMT at constant load. The results obtained allow validating of the additive manufacturing process as possible mechanicals applications.
Tensile mechanical properties of composite materials with continuous fiber produced by additive manufacturing
Authors: Sierra Nossa I , Bohórquez O , Pertuz A , Sánchez Acevedo H G , González-Estrada O A 
Published: November 2019

AbstractAdditive manufacturing of composites parts reinforced with continuous fibers is emerging as a versatile process, capable of producing complex computer-aided design models by fabricating parts adding material layer by layer. Fused deposition modelling using polymeric materials has been used to produce prototypes, with the constraint of the strength of the material. Recently, the use of continuous fiber reinforcement has provided an alternative for the production of load-bearing functional parts. Current international standards for the characterization of composite materials from mechanical tests are established for parts manufactured by conventional methods, such as, manual molding, injection or coatings. Moreover, the standards do not specify procedures for composite materials produced by additive manufacturing. The objective of this work is to evaluate the performance of the reinforced composite materials produced by additive manufacturing for tensile tests under ISO and ASTM standards, and compare the results in terms of the topology of the material configuration. Average values of the tensile strength for composite materials having a triangular nylon matrix reinforced with fiberglass were obtained within the range of 205 MPa to 234 MPa, with deformations no greater than 0.020 mm. These values are higher than the strength provided by additive manufacturing using materials such as polylactic acid and acrylonitrile butadiene styrene.