bluuebunny/crossref_metadata_2025_split huggingface dataset:
Methods for measuring the local emission characteristics of CNT based multi-tip emitters
Authors: Popov E O , Kolosko A G , Filippov S V , Ponyaev S A 
Published: December 2021

Abstract
The work is aimed at obtaining microscopic emission characteristics of individual emission sites of a multi-tip field cathode or large-area emitter (LAFE) based on processing the current-voltage characteristics and emission glow patterns. Processing was carried out on a hardware-software complex for the study of field emission characteristics in real time. The calculation of the microscopic characteristics of the local emission sites — the field enhancement factor and emission area — was carried out by several different algorithms. A comparison of the results showed that the algorithms gave close values of the characteristics, which increases the reliability of the estimates made.
Thin nanocrystalline semiconductor films as selective chemical sensors for ammonia, acetone and other donors
Authors: Chistyakov V , Kazakov S , Grevtsev M , Solov’yov S 
Published: December 2021

AbstractStudied are the films of variously doped polycrystalline n-semiconductors (ZnO, SnO2) as selective sensitive elements (SE) of chemical sensors for various gases and vapours (ammonia, acetone, propane, ethanol, hexane, solvent, turpentine etc.) in artificial air. It has been revealed that their conductivity changes under temperature modulation makes possible data processing which identifies the impurities above. This processing is based on nonlinear regression estimation of so called principal parameters which set is unique for every concentration of every of the gases/vapours.
Comparative analysis of strange meson production in heavy ion collisions
Authors: Borisov V S , Berdnikov A Ya , Berdnikov Ya A , Kotov D O , Mitrankov Iu M 
Published: December 2021

Abstract
The study of deconfinement state of nuclear matter called quark-gluon plasma (QGP) and phase transition of QGP to hadronic gas is the main goal of high energy physics. Some of the important signatures of QGP formation in heavy-ion collisions include strangeness enhancement at intermediate values of the transverse momentum (ρT
) and a jet quenching effect at high ρT values. Nuclear modification factors (RAB
) for light hadrons are used to quantify these effects. The K
*0 and φ mesons can serve as a good probes to investigate QGP properties, because these mesons contain (anti)strange quark and its yields can be measured in a wide ρT
range. Comparison of experimental data with theoretical model calculations is important for understanding the evolution of heavy-ion collision. One of the most commonly used event generators to describe experimental results of collider experiments is Pythia8. This paper shows, that Pythia8 predicts RAB
values of K
*0 and φ less than RAB
values in experimental data. Consequently, additional (hidden)strange particle production mechanisms are involved.
A new limit on the resonant absorption of solar axions obtained via 169Tm-containing bolometer
Authors: Abdelhameed A H , Bakhlanov S V , Bauer P , Bento A , Bertoldo E , Canonica L , Derbin A V , Drachnev I S , Iachellini N Ferreiro , Fuchs D , Hauff D , Kuzmichev A M , Laubenstein M , Lis D A , Lomskaya I S , Mancuso M , Muratova V N , Nagorny S , Nisi S , Petricca F , Proebst F , Rothe J , Ryabchenkov V V , Sarkisov S E , Semenov D A , Subbotin K A , Trushin M V , Unzhakov E V , Zharikov E V 
Published: December 2021

Abstract
A newly developed experimental technique based on 169Tm-containing cryogenic bolometer detector was employed in order to perform the search for solar axions. The inclusion of target material into the active detector volume allowed for significant increase in sensitivity to axion parameters. A short 6.6 days measurement campaign with 8.18 g detector crystal yielded the following limits on axion couplings:

|
g

A
γ

(

g

A
N

0

+

g

A
N

3

)

≤
1.44
×

10

−
14

GeV

−
1

and

|
g

A
e

(

g

A
N

0

+

g

A
N

3

)

≤
2.81
×

10

−
16

. The achieved results demonstrate high scalability potential of presented experimental approach.
New measurement of the β-spectrum of 210Bi with a silicon 4πβ-spectrometer
Authors: Alekseev I E , Bakhlanov S V , Derbin A V , Drachnev I S , Kotina I M , Kuzmichev A M , Lomskaya I S , Mikulich M S , Muratova V N , Niyazova N V , Semenov D A , Trushin M V , Unzhakov E V 
Published: December 2021

Abstract
The shape of 210Bi β-spectrum was measured using a spectrometer based on Si(Li) detectors with a 4π geometry. Full absorption spectrometer allows for a direct measurement of the β-spectra without using the electron backscattering corrections for the response function. The measured value of nuclear shape factor C(W)=1+(-0.4378±0.0072)W+ (0.0526±0.0021) W2 is in agreement with the results of previous studies.
Tubular topological bright-dark and dark laser solitons
Authors: Rosanov N N , Veretenov N A , Fedorov S V 
Published: December 2021

Abstract
We investigate, analytically and numerically, tubular topological laser solitons, which serve as intermediate link between 2D- and 3D-dissipative optical solitons in media with nonlinear amplification and absorption of light or in large-size laser with such a medium. Features of both 3D-dark solitons (with nonvanishing intensity at periphery for all spatial dimensions) and bright-dark solitons (vanishing in two of three dimensions) are studied, including their stability.
The raman spectroscopy method for evaluation of structural changes in hard tissues of teeth after in-office whitening
Authors: Timchenko E V , Timchenko P E , Frolov O O , Magsumova O A , Volova L T , Postnikov M A , Kozlova T V 
Published: December 2021

Abstract
Start The experiments in evaluation of hard tissues using the Raman spectroscopy method have been made. Spectral differences between the tooth enamel and dentin before and after the in-office whitening procedure were found as a result of the work. It was shown with the use of the Raman spectroscopy method that the whitening process causes changes of tooth enamel and dentin related to the changes of organic and mineral components.
Energy flows in tight focus of optical vortices
Authors: Stafeev S S , Kotlyar V V 
Published: December 2021

Abstract
In this paper we investigated tight focusing of optical vortex with topological charge m = 2 and left circular polarization. The simulation was based on Richards-Wolf equation. Light with wavelength 532 nm was focused by aplanatic lens with numerical aperture NA=0.95. It was shown that the longitudinal component of Poynting vector has negative values on the optical axis. The reason of the energy backflow is due to the fact that the projection of the spin flow onto the optical axis is negative and exceeds in absolute value the projection of the orbital energy flow, which is always positive.
X-ray spectral diagnostics of the local environment of zinc in the arachidic acid layers
Authors: Kremennaya M A , Yu Lysenko V , Novikova N N , Yakunin S N , Rogachev A V , Yalovega G E 
Published: December 2021

Abstract
The article describes the behaviour of the Zn ions in aqueous subphase in presence of arachidic acid films at the air/liquid interface first studied by XANES spectroscopy in the fluorescent mode under total external reflection conditions. Fingerprint analysis of experimental spectra was carried out to determine the local structure of zinc ions in arachidic acid. It showed that zinc is surrounded by oxygen atoms, which may correspond to the interaction of zinc ions with polar groups of arachidic acid.
Numerical simulation of a plasmonic lens for laser light focusing
Authors: Kozlova E S , Kotlyar V V 
Published: December 2021

Abstract
In this paper, the design of a plasmonic lens in gold and silver thin films for focusing the light with radial polarization is presented. Using the finite difference time domain method the optimal parameters of the plasmonic lens design are found. It was shown that the silver plasmonic lens produces a tight focal spot with a full width at half maximum of 0.38 of the incident light wavelength.
Comparison of the focused optical vortices produced by high-aperture phase conventional and spiral zone plates
Authors: Savelyeva A A , Kozlova E S , Kotlyar V V 
Published: December 2021

Abstract
Using the FDTD simulation, sharp focusing of a linearly polarized Gaussian beam with an embedded topological charge m = 3 by a phase zone plate and focusing of a Gaussian beam by a phase spiral zone plate with topological charge m = 3 were studied. The obtained results showed that proposed elements formed different patterns of intensity at a focal plane. The spiral zone plate forms a focal spot with three petals. At a distance of 13.5 μm from the focus, the lobe structure of the intensity (and energy flux) is replaced by an annular distribution.
Light-emitting p-i-n GaP/GaPAs NW encapsulated in a flexible PDMS membrane
Authors: Mukhangali S M , Neplokh V , Kochetkov F M , Moiseev E I , Miroshnichenko A S , Deriabin K B , Nasibulin A G , Islamova R M , Mukhin I S 
Published: December 2021

Abstract
Our work is aimed at the method of fabricating arrays of semiconductor III-V NWs transferred into a flexible polymer membrane made of polydimethylsiloxane. GaP/GaPAs NWs with an axial p-i-n structure were synthesized by molecular beam epitaxy. The synthesized NW arrays on substrates were encapsulated into a silicone membrane by the G-coating method in a swinging-bucket centrifuge. After membranes were treated in a plasma mixture of O2/CF2 gases to open the NWs tops, which ensured the application of conductive transparent contacts - single-walled carbon nanotubes obtained by aerosol chemical method. At the last technological stage, the membranes were separated from substrates by peeling with a razor blade and the second carbon nanotubes contact was formed. The obtained LED NW/silicone membranes were characterized by I-V and the electroluminescence spectroscopy measurements.
Synthesis and study of the electrical conductive properties of Cs2Fe2TiO16 in various gas atmospheres
Authors: Rogova D A , Yu Sinel’shchikova O , Besprozvannykh N V , Morozov N A 
Published: December 2021

Abstract
In this work, titanate Cs2Fe2Ti6O16 with a hollandite-type structure was synthesized by solid-phase synthesis. The electrical conductivity of the obtained ceramics was investigated in the temperature range from 25 to 800 °C in air and in the presence of an argon-hydrogen mixture (3% H2). It was found that the electrical conductivity of the compound under consideration depends on the composition of the atmosphere — the activation energy of conduction changes (0.57 eV in air and 0.91 eV in the presence of hydrogen). The volumetric and grain-boundary contributions to the total resistance of the sample in the gases under consideration are separated by impedance spectroscopy at a temperature of 800 °C.
Effect of Nd, Pr substitutional atoms on the magnetic and magnetostrictive properties in (Tb-Dy)(Fe-Co)2 Laves phases
Authors: Politova G A , Ganin M A , Mikhailova A B , Morozov D A , Pankov K E , Dankin D G , Tereshina I S 
Published: December 2021

Abstract
Polycrystalline TbxDy1-xR0.1Fe2-zCoz (R = Nd, Pr, x = 0.2, 0.3; z = 0, 1.3) cubic Laves phase alloys with MgCu2-type structure were prepared by arc melting followed by homogenizing annealing. The crystal structure, magnetic properties, and magnetostriction have been investigated. Compounds with high values of magnetostrictive susceptibility were found in the temperature range 150-300 K. Compounds with partial substitution of cobalt for iron demonstrate a change in the sign of anisotropic magnetostriction. This work continues the search for magnetostrictive materials with inexpensive neodymium and praseodymium.
Quasistationary states in a quantum dot formed at the edge of a topological insulator by magnetic barriers with finite transparency
Authors: Khomitsky D V , Lavrukhina E A 
Published: December 2021

Abstract
A model of quasistationary states is constructed for the one-dimensional edge states propagating along the edge of a two-dimensional topological insulator based on HgTe/CdTe quantum well in the presence of magnetic barriers with finite transparency. The lifetimes of these quasistationary states are found analytically and numerically via different approaches including the solution of the stationary Schrödinger equation with complex energy and the solution of the transmission problem for a double barrier structure. The results can serve as a guide for determining the parameters of magnetic barriers creating the quantum dots where the lifetimes for the broadened discrete levels are long enough for manipulation with their occupation numbers by external fields.
Spectral and correlation analysis of microturbulences in the spherical Globus-M/M2 tokamaks
Authors: Ponomarenko A M , Bulanin V V , Gusev V K , Minaev V B , Petrov A V , Petrov Yu V , Yashin A Yu 
Published: December 2021

AbstractResults of the studies on turbulences carried out on the Globus-M2 and Globus-M tokamaks are presented. The main focus was on the analysis of the data obtained using Doppler backscattering method (DBS). The developed codes for the analysis of DBS signals allowed to study the effects of turbulences on the operational mode of the tokamak. A description of the data processing codes is also included. The analysis performed indicates the suppression of turbulence and the formation of a velocity shear during the L-H transition. It was also successfully used to study density fluctuations during and between edge localized modes (ELMs). Spectral and correlation analysis also led to the discovery of limit-cycle oscillations (LCO) and quasi coherent fluctuations (QCFs) during the I-phase.
Large Eddy Simulation with wall functions of Ahmed body
Authors: Kolmogorov Dmitry K. , Hüppe Andreas , Menter Florian , Garbaruk Andrey V. 
Published: December 2021

Abstract
Large Eddy Simulation with Wall Function (WFLES) is known to be a cheap alternative to classical LES methods for simulation of flow where large and complex computational meshes are typically required. This makes it attractive for engineering applications. However experience of applying such methods to complex turbulent flows with flow separation and reattachment is still little-known in literature. In this work WFLES of flow around simplified car body with slant angle equal to 25 degrees and ReL = 2.8 · 106 is carried out on Octree mesh to demonstrate the capabilities and limitations of the method in such type of the flow. The results on a series of meshes show that even though the general flow topology is well captured, the critical part of the flow on the slant is hardly predicted even on 100 mln mesh. It is concluded that the prediction of separation above the slant requires significant mesh refinement even in the frame of WFLES.
Influence of contraction of a cesium pulse-periodic discharge on its luminous efficacy and spectral properties
Authors: Bogdanov A A , Gavrish S V , Martsinovsky A M , Stolyarov I I 
Published: December 2021

Abstract
The paper presents the results of a study of pulse-periodic discharge cesium lighting lamps with discharge tubes 5 mm in diameter and an interelectrode distance of 55 and 22 mm. The cesium pressure varied from 10 to 750 Torr at a constant triangular current pulse with an amplitude of 80 A. It is shown that the maximum of the luminous efficacy (~ 65 lm/W) corresponds to a pressure of ~ 130 Torr. It was found that a discharge column in the long tube at a pressure of ~ 300 Torr contracted into a bright pinch with a diameter close to that of the electrodes (2 mm). The pinch was localized along the surface of the tube and moves randomly on it. Contraction leads to a repeated increase in the luminous efficacy with pressure up to ~ 70 lm/W. Wall stabilization limits the plasma temperature on the axis of the pinch (it was found from the recombination continuum) to the level of 6000 – 6500 K. The column in short tube is localized along the axis of the tube over the entire power range. The temperature in it quickly rises to 13000-– 14000 K after the maximum of the luminous efficacy.
Nonlinear optical dynamics of two-dimensional super-lattices of quantum V-emitters
Authors: Bayramdurdiyev Davut Ya. , Malikov Ramil F. , Ryzhov Igor V. , Malyshev Victor A. 
Published: December 2021

Abstract
We study theoretically the nonlinear optical response of a super-lattice of regularly arranged three-level identical quantum emitters with a doublet in the excited state to the action of a monochromatic electromagnetic field quasi-resonant to optical transitions in the emitter, using into account the dephasing of the system. The total retarded dipole-dipole interaction of the emitters is accounted for in the mean-field approximation. This interaction plays the role of positive feedback, which (in combination with the immanent nonlinearity of emitters themselves) leads to multistability of the super-lattice response. The stability of different response branches is analyzed using the Lyapunov exponents’ method. Another important property of the super-lattice is its high reflectance in a certain frequency range; i.e., within this range, the super-lattice operates as a perfect nanometer mirror; moreover, reflection can be switched to transmission changing slightly the incident field amplitude (bistability). The possibility of the application of the above-mentioned super-lattice optical properties in nanophotonics is discussed.
Influence of roughness parameters of surface on the emissivity of germanium single crystals
Authors: Tretiakov S A , Molchanov S V , Kaplunov I A , Ivanova A I 
Published: December 2021

Abstract
In this paper observed values of emissivity for germanium single crystals with various surfaces received by classical methods of processing (polishing, grinding by the powders F400, F800), and also for the raw surface after a cut. The received values will allow further thermovision researches of germanium single crystals by methods of active thermal control and IR-defectoscopy with minimization of measurement errors.
Investigation influence of switching tests coatings of magnetically controlled contacts on the surface structure
Authors: Loginov D S , Baskakova A V , Litvinov V G , Kholomina T A , Rybin N B , Trusov E P 
Published: December 2021

Abstract
The results of spectral noise power density measurements of reed switches 10 samples with and without Au-Ru coating are analyzed. The dependences of the spots area formed during switching tests on the electrodes on various noise parameters are constructed.
Schottky diodes based on 4H-SiC epitaxial layers
Authors: Strel’chuk A M , Kalinina E V 
Published: December 2021

Abstract
Forward and reverse current-voltage (IV) characteristics of Cr-SiC (4H) Schottky diodes based on epitaxial layers with doping (1-3)· 1015 cm-3 were studied in the temperature range of 300-550 K. It is shown that in many cases the IV characteristics are close to ideal, but a significant spread of the forward IV characteristics of diodes manufactured in the same way on the same epitaxial layer was found, probably due to the spread of the Schottky barrier heights reaching 0.3 eV. Heating of the diode, as well as packaging, can also change the Schottky barrier height. An alternative explanation suggests the presence of a powerful shunt.
Characterization of Irradiated Wood Plastic Composites (WPCs) Consumer Product
Authors: Harun Siti Nur Idayu , Othman Siti Amira 
Published: December 2021

Abstract
This research paper emphasizes the characterization of irradiated wood plastic composites for consumer product. Throughout this research, it is precisely conducted to observe the mechanical and physical properties of WPCs and their ability to fit in the market globally. The study also carried out to promote WPCs product that came naturally from renewable sources. WPCs in this research can be defined as mixture of wood that can be replaced with pineapple fiber in a polymer matrix. Composite that used in this research mainly consists of 40% polyethylene (PE), 50 % pineapple fiber and the rest is coupling agent that enhance the WPCs mixture. After undergoes several processes such making the raw sample of WPCs mixture, the WPCs were then irradiated under required dose levels of 0.5, 1, 1.5, 2, 2.5 kGy with the aid of the Gamma Cell Irradiator. Soon after, the irradiated WPCs then undergoes characterization process using Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy-Energy Dispersive X-Ray Spectroscopy (SEM-EDX). Diagnosis on the morphology of WPCs found that there was significant difference between the radiated and irradiated surfaces.
Production and Characterization of Activated Carbon from Baobab Fruit Shells by Chemical Activation Using ZnCl2, H3PO4 and KOH
Authors: Nedjai R , Kabbashi N A , Alam M Z , Al-Khatib M F R 
Published: December 2021

Abstract
Chemical agents have a good influence on the formation of activated carbons, surface characteristic, and its adsorption properties. In this study, the effect of activating agents (ZnCl2, KOH, and H3PO4) on baobab fruit shell (BFS) were evaluated. The characteristics of the baobab fruit shell based activated carbon (BF-ACs) were evaluated through the yield and iodine number. BF-ACs were also characterized by Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectroscopy (FT-IR), X-ray Diffraction (XRD), and nitrogen (N2) adsorption. SEM analysis illustrates those porous structures formed on the surface of BF-ACs were with different sizes. The XRD analysis show that the main structures of BF-ACs are amorphous. FT-IR data demonstrates the presence of different surface groups on the produced BF-ACs. Among activating agent, the KOH was observed to the most appropriate for the production of activated carbon with a large surface area (1029.44 m2/g) from baobab fruit shell.
The Comparison of Microstructure and Mechanical Behavior of Stainless Steel 316L Using Near Net Shaped and Fully Embedded Methodologies Using DED Metal Advanced Manufacturing
Authors: Vandever Marcie , Shanmugam Ragavanantham , Ramoni Monsuru , Romine Peter , Whiting Harry 
Published: December 2021

Abstract
The objective of this research is to compare the microstructure and mechanical behavior of 3D printed SS 316L using near net shaped and fully embedded manufacturing extraction techniques. Research findings will allow us to determine if two different manufacturing extraction methodologies of a 3D printed stainless steel part will affect the overall performance of test specimens. Research will implement advanced manufacturing, part designing, part modeling, part simulation, part production, CT X-ray scanning, material characterization, and material testing. Printing of test specimens will be done with a Optomec Lens 3D Hybrid Machine Tool Direct Energy Deposition (DED) metal printer. The DED metal printer will be used for prototype printing and printing test samples. The areas of study will also include modeling and design using SolidWorks CAD software. A comparison of printing orientation/configuration, internal composition, and testing of material structure in the areas of stress to complete failure of test specimens. The internal structure analysis will observe the porosity effects of 3D metal printing with near net shaped and cocoon style print parameters. The study will also address the amount of time, production, strength, composition, and overall performance of SS 316L printed material.