bluuebunny/crossref_metadata_2025_split huggingface dataset:
Evaluating the impact of excavator bucket capacity on the output of a haul truck in different variants of their positioning
Authors: Aksenov V V , Dubinkin D M , Khoreshok A A , Markov S O , Efremenkov A B , Tyulenev M A 
Published: November 2021

Abstract
When studying the influence of excavator bucket capacity on haul truck loading time, it is necessary to assess the technical and economic performance of the complex. If the cost of the machine shift of the complex will not cover the increase in productivity, then it is inexpedient to use this complex. This issue requires further, more detailed study and performance of detailed technical and economic analysis. Also, it is necessary to consider classical recommendations about ratio of excavator bucket capacity and haul truck body. It should be noted that at present, there is a significant divergence in the size range of excavators: powerful, with a large capacity bucket, rope shovels are used for mining the coalless zone; small maneuverable hydraulic shovels – for mining the coal-bearing zone. In this paper, we will try to combine the first and the second: consider hydraulic excavators with maximum bucket capacity, which is reasonable to use when mining overburden. In addition, a detailed study of the options of mutual arrangement of excavator and haul truck has not been performed until recently, this work is intended to fill this gap.
Investigation of the mathematical model of the knife of geokhod executive body interaction with the bottomhole rock
Authors: Aksenov V V , Efremenkov A B , Sadovets V Yu , Pashkov DA 
Published: November 2021

Abstract
The article presents the relevance of the research. The features of the work of the executive body of geokhod are given. A previously developed mathematical model for determining the power and energy parameters of the interaction of the knife executive body of the geokhod with the face rock is presented. On the basis of the model, a study was carried out of the influence of the pitch of the external mover on the power and energy parameters of the interaction of the knife executive body of the geokhod with the bottomhole rock. As a result of the study, it was found that the power parameters increase with increase in the step of the external mover, and the energy parameters decrease.
Neurotechnology and VR. Compatibility and risks
Authors: Burtseva D Ya , Lukov M Yu , Mendeleev E A , Kiselev V A , Petrov R V 
Published: November 2021

Abstract
Over the past century, technology has tightly entered our daily lives, penetrating into all spheres of society. Developing, they are increasingly changing our usual world and lifestyle. One of these technologies is virtual reality systems and neurotechnologies, in connection with which this article is devoted to them. In particular, this work provides information about neurotechnologies and virtual reality. The associated risks arising from the use of these technologies are considered. The principle of interaction between neurogarnituresand virtual reality is given.
Notes about symmetric m-adic complexity of generalized cyclotomic sequences of order two with period pq
Authors: Edemskiy V A , Garbar S V 
Published: November 2021

Abstract
In this paper, we consider binary generalized cyclotomic sequences with period pq, where p and q are two distinct odd primes. These sequences derive from generalized cyclotomic classes of order two modulo pq. We investigate the generalized binary cyclotomic sequences as the sequences over the ring of integers modulo m for a positive integer m and study m-adic complexity of sequences. We show that they have high symmetric m-adic complexity. Our results generalize well-known statements about 2-adic complexity of these sequences.
Molecular structure, enthalpies of formation and dissociation energies of the O – N bond for a number of aliphatic nitrates and nitrites
Authors: Egorov D L , Khrapkovskii G M 
Published: November 2021

Abstract
The optimal conformations of nitrates and nitrites of aliphatic alcohols C1-C4, as well as radicals formed during homolytic cleavage of O-NO2 and O-NO bonds were determined using the multistep (composite) method G4, as well as a large number of different density functional (DDF) methods and basis sets. The enthalpies of formation and dissociation energies of breaking bonds were calculated for the studied compounds. Comparison with the available experimental data shows that the best agreement with experiment is achieved when using the G4 method. In this case, the error in the enthalpies of formation does not exceed 1 kcal/mol. The paper also discusses the features of the influence of the molecular structure on the change in the series of enthalpies of formation and dissociation energies.
Electrical characteristics of silicon differential photoreceivers
Authors: Gavrushko V V , Ionov A S , Kadriev O R , Lastkin V A 
Published: November 2021

Abstract
The volt-ampere curve of silicon differential photodiodes were measured. It was found that the current-voltage curve of the photodiodes of the main and additional channels had a similar shape, without revealing a significant dependence on the implantation dose of the additional channel. The main parameters of the equivalent circuits of photodiodes are determined. In the reverse branch, the dominant impact was exerted by the surface leakage conductivity with a differential resistance of about 10 GΩ. Measurements from minus 60 °C to 60 °C showed that when using amplifiers with an input impedance of about 103 Ω, differential photoreceivers can be successfully used as selective short-wavelength and two-color ones.
Computer simulation of adapting the object image selection method to video surveillance conditions
Authors: Kornyshev N P , Serebrjakov D A 
Published: November 2021

Abstract
The article deals with the issues of computer modeling of methods for selecting images of objects against a non-uniform background. A test video sequence with given background and object parameters is considered, which provides imitation of one of the special cases of video surveillance conditions, namely, the convergence of the video surveillance point and the object. The issues of adaptation of the compensation selection method to the specified conditions of video surveillance are discussed. Examples of test images and graphs of dependences of the probability of correct determination of coordinates depending on the value of the local contrast of the object in relation to the background, obtained by computer simulation are given.
Application of magnetoelectric sensors in biomedicine
Authors: Leontiev V S , Lobekin V N , Saplev A F , Zueva E A , Ivasheva E E , Bichurin M I 
Published: November 2021

Abstract
The prospects of applying highly sensitive magnetic field sensors based on the magnetoelectric effect in biomedicine are discussed in this paper. When developing highly sensitive magnetic field sensors, it is necessary to take into account the magnitude of the equivalent magnetic noise, as well as the mass and size dimensions and ease of use of the system that the sensor is included in. One of the most relevant areas discussed in the article is the application of magnetoelectric magnetic field sensors for magnetocardiography, magnetoencephalography, etc. These methods are non-invasive, have high sensitivity and are easy to use. They also have wide opportunities in detecting weak biomagnetic signals when examining the state of the human body and providing the necessary assistance.
Magnetoelectric gradient structures
Authors: Nikitin A O , Petrov R V 
Published: November 2021

Abstract
This work is a comprehensive theoretical study of a new class of structures – magnetoelectric gradient structures, which are a product of the integration of magnetoelectric mutliferroic layered structures and an artificial dielectric. In this paper, a mathematical model of the behaviour of a layered multiferroic structure in inhomogeneous electric and magnetic fields is built on the basis of solving Maxwell’s equations, taken in the magnetostatic approximation, and the equation of motion of the magnetization. Based on the constructed mathematical model, the influence on the spectrum of eigenwaves of stationary magnetic and electric fields, as well as the values of the dielectric constant of an artificial dielectric layer, are analysed. The results of the study confirm the possibility of designing a new class of electronically controlled microwave devices with a triple control mechanism: magnetic field – electric field – artificial distribution of dielectric constant.
The study of the Metglas/GaAs/Metglas magnetostrictive-piezo-semiconductive structure for practical application
Authors: Petrov D A , Leontiev V S , Semenov G A , Ivanov S N , Sokolov O V , Kozonov A Iu , Syrovarova K A , Semenova K V , Bichurin M I 
Published: November 2021

Abstract
The results of the samples study of the magnetostrictive-piezo-conductive structure based on Metglas/GaAs/Metglas with different geometric dimensions are presented in this article. The sizes of the studied samples were 10.2x5 2x0.63 mm; 15.2x5.1x0 63 mm; 20.1x5. 2x0.63 mm - with epitaxial layers on a gallium arsenide (GaAs) plate and 15.2x5.1x0.62 mm - without epitaxial layers. The obtained results confirm the initial theoretical calculations of the observation of the maximum magnetoelectric effect in the plane of the GaAs (100) plate with the orientation of the long side of the sample along the crystallographic direction [011]. The maximum αME was observed in a sample with dimensions of 15.2x5.1x0.62 mm without epitaxial layers and was equal to αME = 54.19 V/(cm·Oe) at the resonance frequency RF = 145.8 kHz. In conclusion, the prospects for practical application of a design based on the Metglas/GaAs/Metglas magnetostrictive-piezo-semiconductive structure as a magnetoelectric resistor, a magnetoelectric diode and a magnetoelectric transistor are given.
Practical experience condition diagnosis gained from oil-immersed power transformers voltage class 10 kV
Authors: Petrova S Yu 
Published: November 2021

Abstract
Dissolved Gas Analysis (DGA) for oil samples has been the most widely used diagnosis tool for transformer condition assessment for many years. However, DGA use to oil-filled transformers with a voltage class up to 100 kV. The aim of this paper is to address the issue of DGA interpretation to oil-filled transformers with a voltage class of 10 kV. This paper will present DGA tests results from 57 power transformers and will propose a maintenance decision making procedure using the IEC 60599-2015 Ratio Method, IEEE Std C57.104-2008 include Dornenberg Ratio Method and Rogers Ratio Method, and Russian Std CTO 56947007-29.180.010.094-2011 and Russian Std RD 153-34.0-46.302-00.
Triple graphite nitrate cointercalation compounds with acetic acid as precursors for thermally expanded graphite and carbon nanoparticles
Authors: Raksha E V , Davydova A A , Volkova G K , Oskolkova O N , Sukhov P V , Gnatovskaja V V , Glazunova V A , Burkhovetskij V V , Berestneva Yu V , Kartashynska E S , Savoskin M V 
Published: November 2021

Abstract
Triple graphite nitrate cointercalation compounds (GNCCs) with acetic acid were synthesized, characterized by powder XRD and SEM methods, and used as a source of the thermally expanded graphite (TEG). Structural reorganization of graphite nitrate-acetate and triple GNCCs with acetic acid as a result of their exposition in air is discussed on the base of powder XRD data. Dispersions of carbon nanoparticles were prepared by liquid phase exfoliation of TEGs obtained from the GNCCs. It was demonstrated by TEM method that using of the studied TEGs as a source of carbon nanoparticles favours formation of few-layered graphene.
Integral equations of a rectilinear ribbon vibrator near a perfectly conducting infinite screen
Authors: Sochilin A V , Eminov S I 
Published: November 2021

Abstract
The problem of excitation of a rectilinear ribbon vibrator near a perfectly conducting infinite screen is considered. A general equation, a two-dimensional integral equation, and a one-dimensional integral equation with respect to the current density are obtained. The results of numerical calculations are presented.
Comparative theoretical study of the resonance frequencies of the longitudinal-shear and torsion modes of the magnetoelectric effect in a two-layer magnetostrictive-piezoelectric structure Metglas / GaAs
Authors: Sokolov O V , Bichurin M I , Leontiev V S 
Published: November 2021

Abstract
The article is devoted to a comparative theoretical study of the frequencies of the electromechanical resonance (EMR) of the magnetoelectric (ME) effect in the magnetostrictive-piezosemiconductor structure Metglas / GaAs of the longitudinal-shear and torsional modes. It is found that the resonance frequencies for the torsional mode are approximately 2 times higher than the corresponding frequencies for the longitudinal-shear mode. Therefore, it is quite possible to observe the torsional mode of the ME effect against the background of the longitudinal-shear mode, since the resonance frequencies are well distinguishable. The results obtained can find application in the construction of new ME devices.
Polynomials and number sets associated with the probability distribution of the hyperbolic cosine type for even values of the parameter
Authors: Tokmachev M S 
Published: November 2021

Abstract
The polynomials used in the formation of the probability distribution density function of the hyperbolic cosine type are investigated. Earlier, on the basis of a hyperbolic cosine distribution, the author obtained numerical sets, among which not only new ones, but also, for example, the triangle of Stirling numbers, the triangle of the coefficients of Bessel polynomials, sequences of coefficients in the expansion of various functions, etc. In this paper, depending on the natural parameter
m
and the real distribution parameter
β
, a new class of polynomials is obtained. For even and odd
m
, the polynomials are constructed using similar, but different formulas. The article presents polynomials for even values
m
. Structurally, polynomials consist of quadratic factors. The coefficients of the polynomials, ordered by
m
, form numerical triangles depending on
β
. Some relations are found between the coefficients. From the numerical triangles, a set of numerical sequences is obtained, which for integers
β
are integers. Also, polynomials with respect to
x
turn out to be polynomials with respect to
β
. With this interpretation the variable acts as a parameter. New numerical triangles and sequences for different
x
were found. The overwhelming majority of the obtained numerical sequences are new. The class of polynomials arising from problems of probability theory indicates the possibility of applying the results.
Application of new method in quantum-mechanical calculations of the structural properties and the formation energy of the ordered Mu - phase in the Fe - Mo system
Authors: Udovsky A L , Vasilyev D A 
Published: November 2021

Abstract
A new technique of finding the minimum total energy, calculated by quantum mechanical calculations, for hexagonal Mu- (μ-) phases of stoichiometric compositions taking into account relaxation, as well as optimized crystal lattice parameters for different compositions in the Fe-Mo system, has been applied. The convergence of the total energy is investigated as a function of the number of plane waves (k) in the range 2000 ÷ 105. Differences in the structural energies between bcc, C14 Laves and μ- phases of pure components, as well as the formation energies of μ- phases of stoichiometric compositions Fe9Mo4, Fe7Mo6 and Fe6Mo7 are calculated.
The study of the dynamic model of the distribution of labor resources by region in conflict interaction
Authors: Zaitseva I V , Malafeyev O A , Zubov A V , Bondarenko L A , Orlov V B 
Published: November 2021

Abstract
The introduced models turn out to be the development of forces and resources allocation in municipal economy branches if a lot of interests appear in a competitive case. The models combine the reasonable level of adequacy with the practical application in solving the problems. The plans of labour force allocation can be complied on their basis.
Synthesis of a terminal device of a multiplex data exchange channel to FPGA
Authors: Zharkov V I , Petrov M N , Griskevich I Y 
Published: November 2021

Abstract
The article presents a technology for developing a terminal device for a multiplexed serial interface for data exchange to FPGA. The development was carried out using the System Verilog hardware description language. To meet demanding requirements. presented to this interface in terms of transmission speed, as well as the duration of transmitted and received bits of information, the device includes a built-in signal duration analyzer, which can also be used to exclude the influence of a part of the impulse noise that “leaked” through the input high-pass filter. The presented device has passed the verification of the main operating modes in the ModelSim-Altera software environment.
Fast-time and slow-time processing of the pseudorandom amplitude-phase-shift keyed signals
Authors: Zhukova I N , Bystrov N E , Chebotarev S D 
Published: November 2021

Abstract
The two-dimensional raw data structure is used for modern pulse-Doppler radars. Fast-time and slow-time processing of radar return signals is performed. The matched filter compresses each received pulse in fast time. The FFT-based spectral processing of the compressed pulses is then performed in slow time. The two-dimensional structure of raw data has specific features in radars with the transmission and reception of pseudorandom amplitude-phase-shift keyed (APSK) signals to a common aerial. It is formed when the coherent processing interval of the APSK signal is divided into subintervals. The article describes the fast-time and slow-time processing of the APSK signal subintervals. The structure of the signal in the subintervals is also analyzed. The choice of the subinterval duration is discussed. The possible energy losses during the processing of the reflected signals are estimated. The results of the processing modeling of the additive sum of APSK signals with different Doppler frequencies are presented.
Extraction of phenolic compounds from Iraqi Coriandrum Sativum L. and loaded on copolymeric hydrogels and examine there as drug delivery system and antioxidant
Authors: Sadoun Ula Ali , Al-Ali Zainab Shakir , Haddad Athir Mahmood 
Published: November 2021

Abstract
The phenolic extracts for leaves and stems (L+S) parts and leaves (L) part of Iraqi Coriandrum Sativum L. and their total phenols, total tannins and total flavonoids are described. Three copolymeric hydrogels prepared and loaded with phenolic extract 4 (U1-U3). The HPLC results show three phenolic compounds, while the GC-Mass results show one phenolic compound and four non-phenolic compounds. Gained results showed that there are significant (P < 0.05) variations in total phenols (9.822 ± 0.634−4.015 ± 0.118 mg GAE/g DW), total flavonoids (8.112 ± 0.115−2.811 ± 0.371 mg QE/g DW) and total condensed tannin (4.245 ± 0.276−1.135 ± 0.091 mg QE/g DW) contents for all phenolic extracts. The swelling rate for (U1-U3) in distilled water, the SGF, and the SIF was estimated. The maximum swelling was observed in copolymeric hydrogels at pH 6.9 in distilled water. The IC50 values of radical scavenging activity of the phenolic extracts 4, 8 and phenolic extract 4 released from copolymeric hydrogels (U1-U3) show varied significantly (P < 0.05). Our results indicated that Iraqi Coriandrum Sativum L. could constitute a rich and novel source of natural antioxidants. When it loaded on, copolymeric hydrogels could be used as a drug delivery system.
Synthesis, Characterization and Thermal Studies of Fe(II), Co(II), Ni(II) and Cu(II) Complexes with bis-(4-benzylidenamino-phenyl)-methane Schiff base ligand
Authors: Hassan Atared F. , Sabah Hiba H. , Turki Afaq A. 
Published: November 2021

Abstract
A new series of Co(II), Fe(II), Cu(II) and Ni(II) complexes of Bis–(4-benzylidenamino-phenyl)-methane (L) have been prepared and characterized. The complexes conform to general formula [CoL(H2O)3] Cl2, [FeL(H2O)5]SO4.2H2O, [CuL(H2O)5] NO3 and [NiL(H2O)3Cl2], Infra red spectra and elemental analysis reveal uni-dentate coordination of Schiff base to metal ions. Molar conductivity measurements show that complexes (I, III) behave as 2:1 electrolyte while complex (II) behave as 1:1 electrolyte. The thermal studies for complexes shows that the complexes are thermal stable.
Light scattering detector based on light-emitting diodes-Solar cells for a flow analysis of Warfarin in pure form and pharmaceutical formulations
Authors: Turkey Nagham S , Jeber Jalal N 
Published: November 2021

Abstract
Continuous turbidimetric analysis (CTA) for a distinctive analytical application by employing a homemade analyser (NAG Dual & Solo 0-180°) which contained two consecutive detection zones (measuring cells 1 & 2) is described. The analyser works based on light-emitting diodes as a light source and a set of solar cells as a light detector for turbidity measurements without needing further fibres or lenses. Formation of a turbid precipitated product with yellow colour due to the reaction between the warfarin and the precipitation reagent (Potassium dichromate) is what the developed method is based on. The CTA method was applied to determine the warfarin in pure form and pharmaceutical formulations in the concentration range from 2.0-16& 0.7-16 mmol/L with 0.58 and 0.55 mmol/L of the limit of detections. The correlation coefficients (r) of the developed method were 0.9977 and 0.9981 for cell 1 and 2 respectively. For validation of proposed method, the ICH guidelines were followed. The developed method was successfully applied for the determination of Warfarin in pure and pharmaceutical preparations. In addition, the method can be considered as a quality control method and conveniently used for routine analysis in laboratories since the method permits quantitatively determination of 60 samples/h.
Spectrophotometric determination of atenolol via oxidation and bleaching color reaction for methyl red dye
Authors: Zakaria S A , Zakaria R A , Othman N S 
Published: November 2021

Abstract
A selective and sensitive spectrophotometric method has been suggested for the quantitative assay of atenolol (ATNL) as pure and in its manufactural formulation(Tablet). The suggested procedure included oxidation of ATNL with an excess quantity of the oxidant N-bromosuccinimide (NBS), and then the excess of NBS was occupied in bleaching the color of methyl red dye(MRD), then measuring the absorbance of remaining MRD at 518 nm. The absorbance of the unbleached color of MRD corresponds to the ATNL concentration in the sample solution. Beer’s law was followed in the range of 0.1-2.0 μg.ml−1with molar absorptivity value equal to 8.8864x104 l.mol−1. cm−1. The suggested method was applied to the assay of ATNL in commercial tablets, with satisfactory results.