bluuebunny/crossref_metadata_2025 huggingface dataset:
Understanding flow features in drying droplets via Euler characteristic surfaces—A topological tool
Authors: Roy A. , Haque R. A. I. , Mitra A. J. , Choudhury M. Dutta , Tarafdar S. , Dutta T.
Published: December 2020

In this paper, we propose a mathematical picture of flow in a drying multiphase droplet. The system studied consists of a suspension of microscopic polystyrene beads in water. The time development of the drying process is described by defining the “Euler characteristic surface,” which provides a multiscale topological map of this dynamical system. A novel method is adopted to analyze the images extracted from experimental video sequences. Experimental image data are converted to binary data through appropriate Gaussian filters and optimal thresholding and analyzed using the Euler characteristic determined on a hexagonal lattice. In order to do a multiscale analysis of the extracted image, we introduce the concept of Euler characteristic at a specific scale r > 0. This multiscale time evolution of the connectivity information on aggregates of polysterene beads in water is summarized in a Euler characteristic surface and, subsequently, in a Euler characteristic level curve plot. We introduce a metric between Euler characteristic surfaces as a possible similarity measure between two flow situations. The constructions proposed by us are used to interpret flow patterns (and their stability) generated on the upper surface of the drying droplet interface. The philosophy behind the topological tools developed in this work is to produce low-dimensional signatures of dynamical systems, which may be used to efficiently summarize and distinguish topological information in various types of flow situations.
Electrodeless atmospheric secondary induced ionization jet (EASII-jet): Dynamics and properties of a transferred helium plasma source
Authors: Iseni S. , Baitukha A. , Bonifaci N. , Pichard C. , Khacef A.
Published: December 2020

This work introduces a versatile electrodeless cold plasma source in helium based on an atmospheric pressure plasma jet device. The latter is used to generate guided ionization waves (IWs) impinging on a dielectric tube carrying He gas for the production of a secondary induced ionization wave (SIIW). The dynamics of the plasma transfer across the dielectric is investigated by the time resolved iCCD imaging technique and electrical diagnostics. Three operating modes are reported depending on the high voltage (HV) pulse duration, which enables either a single or a double SIIW per HV pulse. Properties of the IWs and the double SIIW are reported. The gas temperature profiles of the plasma plumes expanding into the ambient are investigated by optical emission spectroscopy. The results will be correlated with the time evolution of the current. This electrodeless atmospheric secondary induced ionization jet configuration can be easily implemented to electrically sensitive systems, particularly in the fields of plasma medicine, pulsed electric field therapies, and plasma activated liquids.
Dissociative electron attachment to amide bond containing molecules: N-ethylformamide and N-ethylacetamide
Authors: Chakraborty Dipayan , Eckermann Lauren , Carmichael Ian , Ptasińska Sylwia
Published: December 2020

To advance our quest to understand the role of low energy electrons in biomolecular systems, we performed investigations on dissociative electron attachment (DEA) to gas-phase N-ethylformamide (NEF) and N-ethylacetamide (NEA) molecules. Both molecules contain the amide bond, which is the linkage between two consecutive amino acid residues in proteins. Thus, their electron-induced dissociation can imitate the resonant behavior of the DEA process in more complex biostructures. Our experimental results indicate that in these two molecules, the dissociation of the amide bond results in a double resonant structure with peaks at ∼5 eV and 9 eV. We also determined the energy position of resonant states for several negative ions, i.e., the other dissociation products from NEF and NEA. Our predictions of dissociation channels were supported by density functional theory calculations of the corresponding threshold energies. Our results and those previously reported for small amides and peptides imply the fundamental nature for breakage of the amide bond through the DEA process.
Investigation on the boundary layer transition with the effects of periodic passing wakes
Authors: Ruan Xiaodong , Zhang Xu , Wang Pengfei , Liu Weiting , Hu Liang , Xu Zhongbin
Published: December 2020

The boundary layer transition caused by wake is a problem related to basic fluid mechanics and engineering applications. In this paper, the interaction between the periodic passing wakes induced by moving cylinders and the boundary layer of the plate is investigated by large eddy simulation, and experiments in a low-speed water tunnel are designed to verify the simulations. The flow field velocity is measured by high-resolution pressure sensors and two-dimensional particle image velocimetry. The effects of wake passing frequencies fN = 0.63, 1, and 1.26 on the time average and statistical average characteristics of the boundary layer transition and the instantaneous flow structure are studied. The influence of large-scale wakes on the integral parameters of boundary layer thickness, skin friction coefficients, time-averaged velocity distributions, and velocity fluctuations is addressed. The results show that the onset of transition moves to the leading edge of the plate as the wake passing frequency increases, while the location of transition completion moves to the end of the plate. The specific boundary layer transition process is analyzed through the spanwise pocket and streamwise streaky structure propagation. The vortex structures in the boundary layer are extracted by the Q criterion, and the results show that the spanwise secondary vortex on the pressure side induced by the large-scale wake gradually loses its stability and results in transition. Moreover, the hairpin vortex in the suction surface continually lifts up the wall-normal location of the breakdown event. Thus, it turns the turbulence spot arrowhead pointing downstream into pointing upstream.
The one-dimensional Green–Naghdi equations with a time dependent bottom topography and their conservation laws
Authors: Kaptsov E. I. , Meleshko S. V. , Samatova N. F.
Published: December 2020

This paper deals with the one-dimensional Green–Naghdi equations describing the behavior of fluid flow over an uneven bottom topography depending on time. Using Matsuno’s approach, the corresponding equations are derived in Eulerian coordinates. Further study is performed in Lagrangian coordinates. This study allowed us to find the general form of the Lagrangian corresponding to the analyzed equations. Then, Noether’s theorem is used to derive conservation laws. As some of the tools in the application of Noether’s theorem are admitted generators, a complete group classification of the Green–Naghdi equations with respect to the bottom depending on time is performed. Using Noether’s theorem, the found Lagrangians, and the group classification, conservation laws of the one-dimensional Green–Naghdi equations with uneven bottom topography depending on time are obtained.
Turbulence-free interference induced by the turbulence itself
Authors: Smith Thomas A. , Shih Yanhua
Published: December 2020

When a laser beam is incident on a double-slit interferometer without turbulence, the classic Young’s double-slit interference is present in the first-order measurement of the mean photon number (or intensity), while the second-order measurement of photon number fluctuation correlation (or intensity fluctuation correlation) yields a trivial constant. When optical turbulence is introduced, it destroys the classic interference present in the measurement of the photon number; however, two-photon interference appears in the measurement of photon number fluctuation correlation. This interesting observation means that the observed two-photon interference is not only observable through turbulence, i.e., turbulence-free, but also induced by the turbulence itself. Turbulence-free two-photon interference induced by the turbulence itself allows for interferometric sensing through strong turbulence when coherent radiation, such as a laser, is applied.
Testing the drift-diffusion model
Authors: Fudenberg Drew , Newey Whitney , Strack Philipp , Strzalecki Tomasz
Published: December 2020

Significance

The drift-diffusion model (DDM) has been widely used in psychology and neuroeconomics to explain observed patterns of choices and response times. This paper provides an identification and characterization theorems for this model: We show that the parameters are uniquely pinned down and determine which datasets are consistent with some form of DDM. We then develop a statistical test of the model based on finite datasets using spline estimation. These results establish the empirical content of the model and provide a way for researchers to see when it is applicable.
Biological control of
Drosophila suzukii
Authors: Wang Xingeng , Lee Jana C. , Daane Kent M. , Buffington Matthew L. , Hoelmer Kim A.
Published: December 2020

Drosophila suzukii
(Matsumura) is native to East Asia but has widely established in the Americas and Europe, where it is a devastating pest of soft-skinned fruits. It has a wide host range and these non-crop habitats harbor the fly which then repeatedly reinvades crop fields. Biological control in non-crop habitats could be the cornerstone for sustainable management at the landscape level. Toward this goal, researchers have developed or investigated biological control tactics. We review over 100 studies, conducted in the Americas, Asia and Europe on natural enemies of
D. suzukii
. Two previous reviews provided an overview of potential natural enemies and detailed accounts on foreign explorations. Here, we provide an up-to-date list of known or evaluated parasitoids, predators and entomopathogens (pathogenic fungi, bacteria, nematodes, and viruses) and summarize research progress to date. We emphasize a systematic approach toward the development of biological control strategies that can stand alone or be combined with more conventional control tools. Finally, we propose a framework for the integrated use of biological control tools, from classical biological control with host-specific Asian parasitoids, to augmentative and conservation biological control with indigenous natural enemies, to the use of entomopathogens. This review provides a roadmap to foster the use of biological control tools in more sustainable
D. suzukii
control programs.
Monotonicity Principle in tomography of nonlinear conducting materials
*
Authors: Corbo Esposito Antonio , Faella Luisa , Piscitelli Gianpaolo , Prakash Ravi , Tamburrino Antonello
Published: December 2020

We treat an inverse electrical conductivity problem which deals with the reconstruction of nonlinear electrical conductivity starting from boundary measurements in steady currents operations. In this framework, a key role is played by the Monotonicity Principle, which establishes a monotonic relation connecting the unknown material property to the (measured) Dirichlet-to-Neumann operator (DtN). Monotonicity Principles are the foundation for a class of non-iterative and real-time imaging methods and algorithms. In this article, we prove that the monotonicity principle for the Dirichlet Energy in nonlinear problems holds under mild assumptions. Then, we show that apart from linear and p-Laplacian cases, it is impossible to transfer this monotonicity result from the Dirichlet Energy to the DtN operator. To overcome this issue, we introduce a new boundary operator, identified as an average DtN operator.
Adaptive regularisation for ensemble Kalman inversion
Authors: Iglesias Marco , Yang Yuchen
Published: December 2020

We propose a new regularisation strategy for the classical ensemble Kalman inversion (EKI) framework. The strategy consists of: (i) an adaptive choice for the regularisation parameter in the update formula in EKI, and (ii) criteria for the early stopping of the scheme. In contrast to existing approaches, our parameter choice does not rely on additional tuning parameters which often have severe effects on the efficiency of EKI. We motivate our approach using the interpretation of EKI as a Gaussian approximation in the Bayesian tempering setting for inverse problems. We show that our parameter choice controls the symmetrised Kullback–Leibler divergence between consecutive tempering measures. We further motivate our choice using a heuristic statistical discrepancy principle. We test our framework using electrical impedance tomography with the complete electrode model. Parameterisations of the unknown conductivity are employed which enable us to characterise both smooth or a discontinuous (piecewise-constant) fields. We show numerically that the proposed regularisation of EKI can produce efficient, robust and accurate estimates, even for the discontinuous case which tends to require larger ensembles and more iterations to converge. We compare the proposed technique with a standard method of choice and demonstrate that the proposed method is a viable choice to address computational efficiency of EKI in practical/operational settings.
Bayesian inference of the incompressibility, skewness and kurtosis of nuclear matter from empirical pressures in relativistic heavy-ion collisions
Authors: Xie Wen-Jie , Li Bao-An
Published: December 2020

Within the Bayesian statistical framework we infer the incompressibility K
0, skewness J
0 and kurtosis Z
0 parameters of symmetric nuclear matter (SNM) at its saturation density ρ
0 using the constraining bands on the pressure in cold SNM in the density range of 1.3ρ
0 to 4.5ρ
0 from transport model analyses of kaon production and nuclear collective flow in relativistic heavy-ion collisions. As the default option assuming the K
0, J
0 and Z
0 have Gaussian prior probability distribution functions (PDFs) with the means and variances of 235 ± 30, −200 ± 200 and −146 ± 1728 MeV, their posterior most probable values are narrowed down to

192

−
16

+
12

MeV, −

180

−
110

+
100

MeV and

200

−
250

+
250

at 68% confidence level, respectively. The results are largely independent of the prior PDFs of J
0 and Z
0 used. However, if one adopts the strong belief that the incompressibility K
0 has a uniform prior PDF within its absolute boundary of 220–260 MeV as one can find easily in the literature, the posterior most probable values of K
0, J
0 and Z
0 shift to

K

0

=
22

0

−
0

+
6

MeV,

J

0

=
−
39

0

−
70

+
60

MeV and

Z

0

=
60

0

−
200

+
200

MeV, respectively. While the posterior PDFs of the SNM EOS parameters depend somewhat on the prior PDF of K
0 used, the results from using different prior PDFs are qualitatively consistent. The uncertainties of all three parameters are significantly reduced especially for the J
0 and Z
0 parameters compared to their current values.
Refractory materials and plasmonics based perfect absorbers
Authors: Yao Yu , Zhou Jin , Liu Zhengqi , Liu Xiaoshan , Fu Guolan , Liu Guiqiang
Published: December 2020

In the past decades, metamaterial light absorbers have attracted tremendous attention due to their impressive absorption efficiency and significant potential for multiple kinds of applications. However, the conventional noble metals based metamaterial and nanomaterial absorbers always suffer from the structural damage by the local high temperature resulting from the strong plasmonic photo-thermal effects. To address this challenge, intensive research has been conducted to develop the absorbers which can realize efficient light absorption and simultaneously keep the structural stability under high temperatures. In this review, we present detail discussion on the refractory materials which can provide robust thermal stability and high performance for light absorption. Moreover, promising theoretical designs and experimental demonstrations that possess excellent features are also reviewed, including broadband strong light absorption, high temperature durability, and even the easy-to-fabricate configuration. Some applications challenges and prospects of refractory materials based plasmonic perfect absorbers are also introduced and discussed.
Ultra-dry air plasma treatment for enhancing the dielectric properties of Al2O3-GPTMS-PMMA hybrid dielectric gate layers in a-IGZO TFT applications
Authors: Meza-Arroyo J , Syamala Rao M G , Chandra Sekhar Reddy K , Sánchez-Martinez A , Rodríguez-López O , Quevedo-López M , Ramírez-Bon R
Published: December 2020

We assessed the effects of ultra dry-air plasma surface treatments on the properties of Al2O3-GPTMS-PMMA hybrid dielectric layers for applications to high-performance amorphous Indium Gallium Zinc Oxide (a-IGZO) thin film transistors (TFTs). The hybrid layers were deposited by an easy dip coating sol-gel process at low temperature and then treated with dry-air plasma at 1, 2 and 3 consecutive cycles. Their properties were analyzed as a function of the number of plasma cycles and contrasted with those of the untreated ones. The dielectric characteristics of the hybrid layers were determined fromI–VandC–fmeasurements performed on metal–insulator–metal and metal–insulator–semiconductor devices. The results show that the plasma treatments increase the surface energy and wettability of the hybrid films. There is also a reduction of the OH groups and oxygen vacancies in the hybrid network improving the dielectric properties. The incorporation of nitrogen into the hybrid films surface is also observed. The plasma-treated hybrid dielectric layers were applied as dielectric gate in the fabrication of a-IGZO TFTs. The best electrical performance of the fabricated TFTs was achieved with the 3 cycles plasma-treated hybrid dielectric gate, showing high mobility, 29.3 cm2V−1s−1, low threshold voltage, 2.9 V, highION/OFFcurrent ratio, 106, and low subthreshold swing of 0.42 V dec−1.
Defect spectroscopy of sidewall interfaces in gate-all-around silicon nanosheet FET
Authors: Lee Kookjin , Kim Yeonsu , Lee Hyebin , Park Sojeong , Lee Yongwoo , Joo Min-Kyu , Ji Hyunjin , Lee Jaewoo , Chun Jungu , Sung Moonsoo , Cho Young-Hoon , Kim Doyoon , Choi Junhee , Lee Jae Woo , Jeon Dae-Young , Choi Sung-Jin , Kim Gyu-Tae
Published: December 2020

Through time-dependent defect spectroscopy and low-frequency noise measurements, we investigate and characterize the differences of carrier trapping processes occurred by different interfaces (top/sidewall) of the gate-all-around silicon nanosheet field-effect transistor (GAA SiNS FET). In a GAA SiNS FET fabricated by the top-down process, the traps at the sidewall interface significantly affect the device performance as the width decreases. Compare to expectations, as the width of the device decreases, the subthreshold swing (SS) increases from 120 to 230 mV/dec, resulting in less gate controllability. In narrow-width devices, the effect of traps located at the sidewall interface is significantly dominant, and the 1/f
2 noise, also known as generation–recombination (G–R) noise, is clearly appeared with an increased time constant (τ

i
). In addition, the probability density distributions for the normalized current fluctuations (ΔI
D) show only one Gaussian in wide-width devices, whereas they are separated into four Gaussians with increased in narrow-width devices. Therefore, fitting is performed through the carrier number fluctuation-correlated with mobility fluctuations model that separately considered the effects of sidewall. In narrow-width GAA SiNS FETs, consequently, the extracted interface trap densities (N

T
) distribution becomes more dominant, and the scattering parameter (

α

S
C

) distribution increases by more than double.
Second harmonic generation from metal nanoparticle dimer: an analytical approach in dipole approximation
Authors: Kheirandish Asef , Javan Nasser Sepehri , Mohammadzadeh Hosein
Published: December 2020

In this theoretical study, the problem of Second Harmonic Generation (SHG) in the interaction of laser beam with a Metallic Nanoparticle (MNP) dimer is considered. Using a classical electrodynamics approach, the nonlinear interaction of laser beam fields with Nanoparticles (NPs) is considered taking into account the dipole-dipole interparticle interactions. Analytical formulae are derived for the effect of dipole-dipole interaction on the Second Harmonic (SH) radiation power for two different polarizations of laser beam. It is found that the interaction causes the substantial enhancement of the SH radiation power while for the case when the laser beam field is parallel to the dimer axis, this enhancement is larger. Additionally, the dipole-dipole interaction of NPs leads to the redshift of the peak value with respect to the individual NP radiation. The resonance frequency displacement of the parallel case is more than that of the perpendicular one. The effect of particles size and interparticle separation on the SHG is studied.
Handwritten digit recognition based on ghost imaging with deep learning*
Authors: He Xing , Zhao Sheng-Mei , Wang Le
Published: December 2020

We present a ghost handwritten digit recognition method for the unknown handwritten digits based on ghost imaging (GI) with deep neural network, where a few detection signals from the bucket detector, generated by the cosine transform speckle, are used as the characteristic information and the input of the designed deep neural network (DNN), and the output of the DNN is the classification. The results show that the proposed scheme has a higher recognition accuracy (as high as 98% for the simulations, and 91% for the experiments) with a smaller sampling ratio (say 12.76%). With the increase of the sampling ratio, the recognition accuracy is enhanced. Compared with the traditional recognition scheme using the same DNN structure, the proposed scheme has slightly better performance with a lower complexity and non-locality property. The proposed scheme provides a promising way for remote sensing.
First-principles analysis of phonon thermal transport properties of two-dimensional WS2/WSe2 heterostructures*
Authors: Chang Zheng , Yuan Kunpeng , Sun Zhehao , Zhang Xiaoliang , Gao Yufei , Gong Xiaojing , Tang Dawei
Published: December 2020

The van der Waals (vdW) heterostructures of bilayer transition metal dichalcogenide obtained by vertically stacking have drawn increasing attention for their enormous potential applications in semiconductors and insulators. Here, by using the first-principles calculations and the phonon Boltzmann transport equation (BTE), we studied the phonon transport properties of WS2/WSe2 bilayer heterostructures (WS2/WSe2-BHs). The lattice thermal conductivity of the ideal WS2/WSe2-BHs crystals at room temperature (RT) was 62.98 W/mK, which was clearly lower than the average lattice thermal conductivity of WS2 and WSe2 single layers. Another interesting finding is that the optical branches below 4.73 THz and acoustic branches have powerful coupling, mainly dominating the lattice thermal conductivity. Further, we also noticed that the phonon mean free path (MFP) of the WS2/WSe2-BHs (233 nm) was remarkably attenuated by the free-standing monolayer WS2 (526 nm) and WSe2 (1720 nm), leading to a small significant size effect of the WS2/WSe2-BHs. Our results systematically demonstrate the low optical and acoustic phonon modes-dominated phonon thermal transport in heterostructures and give a few important guidelines for the synthesis of van der Waals heterostructures with excellent phonon transport properties.
The development of ontological model for increasing the competitiveness of university graduates in information technologies
Authors: Kurzaeva L V , Povitukhin S A , Usataya T V , Usatiy D U
Published: December 2020

The relevance of this work is supported by the need to ensure the professional training compliance with both formal and informal requirements of the education system and the labour market. A lack of methods and technologies being able to harmonize the outcome of the information technologies curriculum and the labour market demands is the reason why the university graduates find it difficult to compete on the labour market. The paper describes the method for an ontological model development that would be able to form the content of the IT-competencies and to assess them in the university students. It is based on two thesis: the first, the boundaries of the subject area of competencies should be defined and, the second, a method of taking into account individual characteristics and needs for creation of an individual professional training and self-study plan should be preliminary considered and developed. The article presents the ontological model developed by the stated method to form the content of the IT-competencies and to assess them for the case of the subject area of 1C: Enterprise platform business solutions. The knowledge base created by the ontological model can be integrated into the decision-making intelligence information systems intended for the sphere of education, corporate training and HR management. This article is aimed at the professionals developing new tools and methods for management of distance education and distance learning.
Ornitological research in the system of natural scientific education
Authors: Miklyaeva M , Okolelov A , Zolotova O , Popova E , Shubin A
Published: December 2020

Ornithological research on natural science education develops creative activity, independence, logical thinking, responsibility and initiative of students, the ability to correctly use biological methods, contribute to self-education and self-education, form an active life position. The study of the clutch size and morphometric features of great tit eggs showed their dependence on many factors that regulate the number of individuals and affect the formation of the population as a whole. The impact of exogenous factors on birds is perceived differently due to their heterogeneity, which was later expressed in the ratio of large and small clutches, a decrease in their number. The dependence of the formation of biological heterogeneity of great tit eggs in each clutch under the influence of environmental factors is established. The conducted research stimulates cognitive interest, activates mental activity, memory, attention, using a variety of form and content of ornithological methods that contribute to the formation of the foundations of worldview and moral experience of relationships with the environment.
Training system for professionally competent personnel of student construction brigades’ main office in NRU MGSU (2011-2019)
Authors: Voronkov I E , Ostrovskii R V , Gamov B A
Published: December 2020

The rapid development of engineering and technologies determines the urgent need to train professionally competent personnel for all areas of the national economy. The construction industry, which serve as one of the national economy’s drivers, is no exception. Improvement of young professionals’ training processes in engineering specialties is possible using institution of the student construction brigades, which turns into an effective tool for students to develop both hard and soft skills, when implemented at the proper level. Achieving the stated effect becomes possible providing timely decision of a number of organizational and managerial tasks. Such as the formation of a clear goals hierarchy of the movement, the selection and systematic transformation of the most effective organizational structure type of student construction brigades in an educational organization, as well as the development and implementation of a training system that provides for both consolidation of students professional skills and their personal qualities development. In 2011-2020, authors of the study developed, implemented and constantly improved the system for training professionally competent personnel of NRU MGSU student construction brigades. Implementation results of three events cycles interconnected in time, goals and resources in 2014-2019 was an achievement of significant success in training young specialists for the construction industry by NRU MGSU SCB.
Development of knowledge management process at the enterprise of technical service of the agro-industrial complex
Authors: Karpuzov V , Golinitskiy P , Cherkasova E , Antonova U , Toygambaev S
Published: December 2020

The creation of approach of knowledge conduct at the enterprise of technical service of APC is established. Several items were established in this article: the normative base, the model and specification of knowledge conduct for the enterprise of technical service of APC, the procedure for creation and implementation of conduct knowledge process at the enterprise of technical service of APC.
Development of a management system for educational projects in the context of distance education
Authors: Okrepilov V V , Getmanova G V , Khmeid G V
Published: December 2020

In 1975 A. D. Ursul introduced the concept of "information explosion" to denote a constant increase in the speed and volume of information on the planetary scale. The information crisis was consequence of this explosion-a decrease in the efficiency of information use, when the existing methods of searching, collecting, processing, storing information do not allow to use all its enormous potential. Scientists who do not have time to keep track of recent publications in their specialization were the first who faced this problem. But now this problem has captured almost all types of human activity. In education, this has led to the introduction of new technologies. The distance learning one of them. By creating new opportunities for access to information, this form also creates new problems. The design and transmission of the theoretical block is simplified, but the organization of practical classes and the passage of all types of practices requires the creation of new methods of interaction between students and teachers. The decrease in the number and intensity of personal contacts in distance learning makes it problematic to form many types of competencies that require direct participation in activities. The article is devoted to one of the ways to solve this problem-the use of tools and methods of project management and solving problems in the organization of distance education. It analyzes both existing experience and proposes tools from the field of project management and quality management that have not been previously used in education.
YouTube English video lectures as a basis of CLIL classes for students of mathematics
Authors: Gigoryeva-Golubeva V , Silina E , Surinova E
Published: December 2020

The nowadays educational system has to adapt to the ever-changing society demands to provide it with graduates possessing high level of general knowledge, analytical thinking and creativity as well as specialized competences. With strict time limits set for academic courses, an apparent way to a more compact material presentation and practicing lies in the transdisciplinary approach. As far as a foreign language at a technical university is concerned, it can be effectively studied within an integrated course, combined with one of the core subjects in the form of CLIL classes, which would be beneficial for both disciplines. This paper presents the results of experimental teaching English to students of applied mathematics based on authentic YouTube video lectures in mathematics, demonstrating the rich potential of CLIL format for tertiary courses.
Educational potential of studying recurrence relations in the preparing of prospective mathematics teachers
Authors: Nigmatulin R M , Vaguina M Yu , Kipnis M M
Published: December 2020

The substantive preparing of prospective mathematics teachers includes studying many branches of mathematics. Students encounter a very large number of various mathematical concepts and facts from different disciplines, so it is difficult for them to detect connections between these concepts and facts and to have an idea of the general system of mathematical knowledge. This makes it complicated to successfully study at the university, since many mathematical concepts and facts are assimilated by them formally. In the last three decades the section “recurrence relations” have appeared in almost all discrete mathematics textbooks. However, students encounter recurrent formulas when studying other mathematical disciplines. The experience of studying recurrence relations was analyzed in the article and it was demonstrated that studying recurrence relations has great educational potential for solving these problems and contributes to the higher level of preparing of prospective mathematics teachers. We propose to realize this potential through a system of reference tasks for practical exercises with students. The article presents both well-known problems from various branches of mathematics, and new problems, that we made by ourselves. These tasks can be used as a basis for the development of such a system of reference tasks.
Determination of calcium and magnesium by atomic absorption spectroscopy and flame photometry
Authors: Bisergaeva R A , Sirieva Y N
Published: December 2020

The comparison of emission intensities of unknown samples to either that of standard solutions, the alkali and alkaline earth metals. Flame photometer has both quantitative and qualitative applications. Flame photometer with monochromators emits radiations of characteristic wavelengths which help to detect the presence of a particular metal in the sample. This help to determine the availability of alkali and alkaline earth metals. Simple direct analysis procedure calcium, magnesium, in test solution flow injection analysis using flame atomic absorption spectroscopy or flame photometry designed using a well-mixed dilution chamber to increase calibration range. Analysis results real samples correspond to those found in the flame batch atomic procedure. Using the dilution chamber allows possibility of calibration using a dilution profile a single concentrate standard for each element and an empirical dilution equation that can be used to all elements are defined in each sample.
Digital educational platform as a personnel management tool
Authors: Feoktistov A V , Trofimenko O N , Ognev S P , Lyakhovets M V , Koynov R S
Published: December 2020

External and internal challenges facing the domestic system of vocational education today require structural and managerial changes in professional educational organizations that facilitate the adoption of effective timely management decisions and, at the same time, create conditions for the emergence of initiatives focused on the sustainable development of an educational organization including those related to the professional activities of teachers. The article deals with the management system of the educational process of vocational education from the classical theory of automatic control point of view. The structure of combined management, allowing to implement the management process of the educational organization of vocational secondary education, based on the process management model of the “Deming cycle” principle is proposed. The input and output parameters, control and setting actions are concretized. The implementation of control systems based on subsystems for monitoring the effectiveness of educational and methodological support activities and management, integrated into the digital educational platform of secondary vocational education, is proposed.
Computer simulation of processes in technical systems
Authors: Antokhina Yu A , Balashov V M , Semenova E G , Varzhapetyan A G
Published: December 2020

In recent years, due to the uncertainty of the external environment; increasing number of functions performed; development of the element base; widespread introduction of information and communication technologies, technical systems have sharply complicated. Complication of systems has made it very difficult, if not impossible, to study them using mathematical apparatus. Analytical description led to inadequate results, which served as a basis for making bad decisions. In connection with the said, at the end of the twentieth century the creators of systems began to use more and more actively the methods of computer modeling. The experience of teaching the theory of complex systems in the higher school shows that not enough attention is paid to consideration of computer modeling methods. In conditions of economy digitalization, such situation is unacceptable, as the future specialist should know and possess these methods. The article is devoted to consideration of one of the directions of computer modeling-discrete-event (simulation) modeling, to be more exact, to one of the simulation modeling software tools-simulation research environment-GPSS Studio.
The effectiveness of the pedagogical conditions for organizing the educational process using distance educational technologies at the university
Authors: Kornienko D V , Shcherbatykh S V , Mishina S V , Popov S E
Published: December 2020

This article solves such a significant scientific problem as the identification of effective pedagogical conditions for organizing the educational process using distance educational technologies at a university. The article discusses three options for organizing the educational process at a university: traditional full-time and part-time education, part-time education with partial use of distance learning technologies, completely distance learning. The study defines the following conditions as pedagogical conditions, grouped into 4 clusters: training content, training time, training methodology, training control. The study examines motivation for learning, training level, learning ability, and the strength of learning outcomes (residual knowledge) as criteria that make it possible to compare the effectiveness of certain pedagogical conditions in the implementation of the educational process in traditional and remote forms. To determine the statistical significance of the research results, the Student’s t-test is used. The study was conducted on the basis of the Yelets State University named after I. A. Bunin in the period of 2018-2020. The study involved 3567 students and 440 teachers. The study revealed pedagogical conditions, the effectiveness of which is determined by general pedagogical mechanisms, as well as pedagogical conditions that are effective only for distance education.
Digital education: VKontakte social network as a means of organizing the educational process
Authors: Orishev A B , Mamedov A A , Kotusov D V , Grigoriev S L , Makarova E V
Published: December 2020

The article reveals the topic of the place and role of the Vkontakte social network in the organization of the educational process, the relevance of which was confirmed during the Covid-19 pandemic. The object of the research is digital education at Russian universities. The subject of the research is the VKontakte social network as a means of organizing the educational process. The authors share the experience of using social networks, accumulated in the process of teaching social disciplines at the Timiryazev Academy. The data proving the popularity of this network among students in Russia are presented. The main scientific result: not only the high efficiency of using the VKontakte social network for organizing the educational process has been proven, but also a proposal is formulated to consider digital literacy and knowledge of modern digital technologies as one of the qualification requirements for higher school teachers.
Active investigation and publishing of calculation web based applications for studying process
Authors: Sutchenkov A A , Tikhonov A I
Published: December 2020

The article discusses STEM technologies used in technical specialties students’ teaching to conduct scientific and technical calculations and development of calculation applications. As the platform ecosystem Python, Jupyter Notebook and Jupyter Lab, Visual Studio Code are used. The use of the listed software tools allows not only to carry out multivariate calculations and calculative experiments but also to describe solved problems formulation, simply and quickly design the user interface and to visualize the calculation results. On the basis of the Virtual Box virtual machine an environment has been developed which allows to develop applications quickly, publish them using Plotly Dash, Voila, Streamlt technologies, control users, content and create electronic active content educational resources with moderate labor intensity.
Digitalization of diagnostics of cognitive strategies for designing puzzle objects
Authors: Shadrin Igor V , Shkerina Lyudmila V , Dyachuk Pavel P , Polichka Anatoly E , Peregudova Irina P
Published: December 2020

This research describes an instrumental method for studying the activity of students in problem solving, based on the use of dynamic computer tests (simulators) to diagnose cognitive strategies for designing puzzle objects. The proposed instrumental method allows to experimentally obtain actiograms of actions that graphically display human activity in finding solutions to problems. Actiograms of actions or trajectories of educational activities reveal individual differences in the ways of obtaining information about the designed puzzle object, and diagnose the cognitive strategies of subjects to find solutions to problems. Designed objects can have different subject contents: graphic, mathematical, verbal, spatial, etc.
Learning stereometry in a secondary school within GeoGebra’s Augmented Reality app
Authors: Shabanova M , Bezumova O , Zatsepina E , Malysheva S , Kotova S , Ovchinnikova R
Published: December 2020

GeoGebra dynamic mathematics system has earned a public acceptance as a software product to support educational and even scientific activities in the field of mathematics. Since 2017, GeoGebra developers have provided users of this program with a new feature for creating and using AR. In this article a series of tasks for modeling of real objects using GeoGebra AR is presented. They assigned to different levels of secondary geometric education: basic, specialized, and advanced. Setting such tasks for students contributes to the formation of visual thinking and skills of using of stereometry knowledge for solving practical problems.
Economical competencies for IT professionals
Authors: Bobrysheva O V , Borisov V N , Gotovchikova V A
Published: December 2020

A modern specialist in the field of IT technologies must inevitably be conversant with the economic environment in which he or she conducts their development work, as well as to be familiar with economic processes and financial data, which can be related to the work as a whole and to some of its aspects. Therefore, an IT specialist should be competent in economic theory, management and marketing, as well as risk management. The peculiarities of today’s fluctuation functioning of objects in the world economy bring some new requirements for the level of training in such disciplines, as Mathematical methods in Economics, Cyclical processes and Economic forecasting. This research paper presents an argument for a certain minimum knowledge, skills and competencies that are needed in order to increase the competitiveness of an IT specialist. And some basic knowledge in law science and English language must be added to this minimum. The paper summarizes the experience of teaching Economics and economic-mathematical and predictive models for future specialists, as well as the experience of young IT specialists.
Innovative technologies for evaluating effect of information security systems in the digital educational environment
Authors: Zastrozhnov I I , Krisilov A V , Korolev I D , Kryukov D M , Alferov V P , Oleinikova S A
Published: December 2020

The article presents innovative technologies for evaluating the effectiveness of information security systems (ISS) in the digital educational environment. A model of the dynamics of ISS functioning using Petri nets is developed. Based on this model, a Markov model of ISS functioning, described by the Markov matrix, has been developed. A criterion for evaluating the effectiveness of ISS functioning is defined, for which the probability of timely implementation of ISS information resource protection is used. An analytical model for evaluating the efficiency criterion of ISS functioning is proposed. The results of numerical modeling of the criterion of timely implementation of information resource protection for ISS are presented "Spectrum-Z". The results of a computational experiment to evaluate the efficiency criterion for the functioning of this ISS are presented.
Peer to peer Education 4.0
Authors: Gurjanov A V , Zakoldaev D A , Shukalov A V , Zharinov I O
Published: December 2020

The Education 4.0 technology has now a more secured position in systems controlling the education process. Peering technology is a perspective one to provide a high school learning oriented for students. The peering technology uses an electronic environment web-portal to support asynchronous and collaborative education. The electronic sub technology facilitates the non-auditory web-lections organization. The asynchronous sub technology realizes the online courses education chains social construction method, which correspond the student standards and personal interests. The collaborative sub technology propagates the crew method idea to grasp the competences into the education system, which may reveal the each student personality individual characteristics. There is a way described how to use simultaneously three sub technologies of the high school students peering education. To apply the peering technologies in education may help to develop synchronically student professional and over-professional competences, which are relevant for their industry job. The education peering technologies correspond the being changed today technological world. The peering education actual state is proved with the most education methods significance over-evaluation for a student oriented education.
Educational engineering: the technological basis for creating educational products
Authors: Rudinskiy I D , Parakhina O V , Pugacheva N S , Kravets O Ja
Published: December 2020

The article proves and substantiates the necessity of introducing the concept of educational engineering into the educational process. Various definitions of the terms ‘engineering’ and ‘educational engineering’ are analyzed and considered. The main task of engineering in the educational process is determined in the article along with the reasons that stimulate the introduction of educational engineering into pedagogy. The definition of educational engineering is formulated determining the considered term as a model with certain characteristics. The article proposes the concept of educational engineering, which is based on the categories ‘Educational product’ and ‘Educational product life cycle’ and includes a system of principles for implementing an engineering approach to creating such products. The definitions of basic terms are proposed and the structure of the educational product life cycle is characterized. The phases of the educational product life cycle and its phasic states are described. The principles for educational product developing are formulated. The article contains a conclusion about the possibilities for implementing the presented concept of educational engineering.
Development of engineering thinking with the use of research activities in the field of plant raw materials deep processing
Authors: Yurtaeva L V , Marchenko R A , Kaplyov E V , Vasil’eva D Yu
Published: December 2020

Currently, in connection with the development of computer technology and modern means of communication, when the use of information technology becomes necessary in almost any field of human activity, information technology of education is increasingly being discussed. One of the priority directions of the digitalization process of modern society is the informatization of scientific research and the learning process-the introduction of new information technologies. The article discusses the role of research activities using educational information technologies in scientific research in the field of deep processing of vegetable raw materials. Stimulation of the cognitive activity of students, aimed at finding solutions to the tasks set, will contribute to the formation of skills for further professional activity.