bluuebunny/crossref_metadata_2025 huggingface dataset:
Liminal islands
Authors: McLoughlin Nigel
Published: November 2020

This chapter uses Text World Theory (Werth 1999; Gavins 2007) in conjunction with Stockwell’s model of literary resonance (2009) to analyse the mechanisms by which liminal spaces are created and developed in two poems by Derek Mahon. The analysis will focus on how liminal spaces are used in the poems to effect co-presences. In ‘Beyond the Pale’ a sense of loneliness and longing is created through the superimposition of topographically similar but distant landscapes, allowing wished co-presences to be made tantalisingly close, but never realised. While in ‘Rathlin’ a liminal seascape allows for the possibilities of temporal co-presences in a space which is outside of our normal conception of time. The study will show that the combination of Text World Theory with the attentional tracking capabilities of the resonance model offers a more dynamic version of Text World Theory that attends to text-worlds in attentional relation to each other over time, which in turn helps to create the liminal effects of the poems.
“Boston Strong”
Authors: Berberich Kristin
Published: November 2020

Marathons connect both runners and onlookers to a space in unique ways and thus constitute a prime example of the reciprocal relation between language and space. This analysis draws on the Boston Marathon 2013/2014 to highlight the role of place-making practices and enregisterment connected to the world’s oldest marathon and the city it takes place in, both before and in the aftermath of the Boston Marathon Bombings (BMB) in 2013. In line with recent sociolinguistic work on language in the urban space, this paper uses a corpus-based approach to analyse how the city is discursively created as the place of the event and, in the year after the BMB, reclaimed as a place of cheerful celebration and resilience in the wake of the incident. This study compares newspaper texts and then draws on selected semiotic artefacts that were utilized as place-making strategies in the two years analysed, thus highlighting the creative and meaning-making potential of social actors. Furthermore, the analysis discusses the role of local and supra-local social actors in the linguistic “placing of memory” (Cresswell 2004: 85) on the Boston cityscape through enregisterment before and after the BMB.
“She enjoys being stroked”, “They are affectionate, lively and
interactive boys”
Authors: Virdis Daniela Francesca
Published: November 2020

This chapter analyses animal agency in a corpus of texts from the website of Battersea Dogs & Cats Home, an English charity rehoming dogs and cats, more precisely from the cat rehoming gallery. The chapter firstly provides definitions of alternative discourse and of agency in the disciplines of human-animal studies and Hallidayan functional grammar. Secondly, the theoretical framework and methodology of functional grammar are applied to the corpus in order to classify all the processes performed by the cats into the six Hallidayan process types and to examine their stylistic representation. In accordance with the aims and scope of ecostylistics, the main research purpose is to demonstrate that the website constructs an environmentally-conscious alternative discourse instilling respect for the Battersea cats and paying tribute to them as independent living beings with their own experiences and priorities.
Thinking for speaking in the right aspect
Authors: Bulatovic Vesna
Published: November 2020

In this article we focus on the category of aspect and examine modern English grammars to see whether they give sufficient guidelines to the learner on how aspectual meanings are decoded and encoded in English. More precisely, we check whether the grammars reflect the abundant linguistic research on aspectual construal in English. Out of a number of components that play a role in the shaping of aspectual meaning, we look at the following four: lexical aspect, arguments, grammatical aspect, and tense. An overview is first made of the key theoretical findings on the impact of these four components on aspectual interpretation, followed by an analysis of the grammar content on the given components. Our conclusion is that only two comprehensive grammars we examined take into account the results of linguistic research on aspect to a certain extent and that there is a lot of room for improvement.
A story-writing based study on the acquisition of aspect in Spanish by Mandarin Chinese learners
Authors: Sun Yuliang , Díaz Rodríguez Lourdes , Taulé Mariona
Published: November 2020

In this paper, we analyze the acquisition of Spanish past tense aspect by Mandarin Chinese learners of Spanish by means of three semi-guided writing tests. Specifically, we analyze the choice ofpretérito indefinidoandpretérito imperfecto, taking into account lexical aspect, grounding information, and the combination of both as variables. Moreover, we analyze whether transfer from Mandarin Chinese, the students’ first language (L1), occurs in the acquisition process. Our results partly support the Lexical Aspect Hypothesis (Andersen, 1991;Andersen & Shirai, 1996) and the Discourse Hypothesis (Bardovi-Harlig, 1994). According to these hypotheses, verbal properties and grounding information play a role in the selection ofpretérito indefinidoorpretérito imperfecto. Finally, our data support the existence of L1 transfer at the semantic level only.
Exploring the impact of word order asymmetry on cognitive load during Chinese–English sight translation
Authors: Ma Xingcheng , Li Dechao , Hsu Yu-Yin
Published: November 2020

This paper explores the impact of word order asymmetry between source language and target language on cognitive load during Chinese–English sight translation. Twenty-five MA students of translation from a Hong Kong university were asked to sight translate sentences with different degrees of between-language structural asymmetry from Chinese into English, in both single-sentence and discourse context conditions. Their eye movements were recorded to examine cognitive load during sight translation. The results show: (1) There was a significant effect of word order asymmetry on overall cognitive load as indicated by the considerably longer dwell times and more frequent fixations for the asymmetric sentences, but it was only during the later-processing stage that structural asymmetry exerted a strong influence on local processing in terms of first fixation duration and regression path duration; (2) the role of context in offsetting the asymmetry effect was very limited; and (3) although reordering may place a greater burden on working memory, most participants preferred reordering over segmentation to cope with the asymmetric structures. The empirical data point to the need to consider word order asymmetry as a variable in theoretical accounts of the interpreting process, especially for interpreting between languages that are structurally very different.
Effect of carbon on microstructure and mechanical properties of Fe36Mn36Ni9Cr9Al10 high-entropy alloys
Authors: Bai Li , Wang Yuzhe , Yan Yi , Li Xiaoyang , Lv Yukun , Chen Jian
Published: November 2020

The effect of C-alloying on phase constituent, microstructure and mechanical behaviour of a novel Co-free (Fe36Mn36Ni9Cr9Al10)100- xC x ( x = 0, 1.5, 2.5, 3.5, 5, 6) low-cost high entropy alloy (HEA) system was investigated. Addition of carbon promoted the transformations of BCC and B2 phase in the original C-free HEA into FCC phase. At a carbon content of 2.5 at.-% and beyond, hardly BCC phase constituent can be obtained. Optimised mechanical properties with a yield strength of 387 MPa, tensile strength of 741 MPa along with excellent ductility of 57% were achieved at a carbon content of 2.5 at.-%. The improvement in mechanical properties of the (Fe36Mn36Ni9Cr9Al10)97.5C2.5 HEA can be ascribed to enhance the work hardening ability originated from microband-induced plasticity effect.
Resting and stimulated mouse rod photoreceptors show distinct patterns of vesicle release at ribbon synapses
Authors: Hays Cassandra L. , Sladek Asia L. , Thoreson Wallace B.
Published: November 2020

The vertebrate visual system can detect and transmit signals from single photons. To understand how single-photon responses are transmitted, we characterized voltage-dependent properties of glutamate release in mouse rods. We measured presynaptic glutamate transporter anion current and found that rates of synaptic vesicle release increased with voltage-dependent Ca2+ current. Ca2+ influx and release rate also rose with temperature, attaining a rate of ∼11 vesicles/s/ribbon at −40 mV (35°C). By contrast, spontaneous release events at hyperpolarized potentials (−60 to −70 mV) were univesicular and occurred at random intervals. However, when rods were voltage clamped at −40 mV for many seconds to simulate maintained darkness, release occurred in coordinated bursts of 17 ± 7 quanta (mean ± SD; n = 22). Like fast release evoked by brief depolarizing stimuli, these bursts involved vesicles in the readily releasable pool of vesicles and were triggered by the opening of nearby ribbon-associated Ca2+ channels. Spontaneous release rates were elevated and bursts were absent after genetic elimination of the Ca2+ sensor synaptotagmin 1 (Syt1). This study shows that at the resting potential in darkness, rods release glutamate-filled vesicles from a pool at the base of synaptic ribbons at low rates but in Syt1-dependent bursts. The absence of bursting in cones suggests that this behavior may have a role in transmitting scotopic responses.
Artificial oxide heterostructures with non-trivial topology
Authors: Gunnink Pieter M , Bouwmeester Rosa Luca , Brinkman Alexander
Published: November 2020

In the quest for topological insulators with large band gaps, heterostructures with Rashba spin–orbit interactions come into play. Transition metal oxides with heavy ions are especially interesting in this respect. We discuss the design principles for stacking oxide Rashba layers. Assuming a single layer with a two-dimensional electron gas (2DEG) on both interfaces as a building block, a two-dimensional topological insulating phase is present when negative coupling between the 2DEGs exists. When stacking multiple building blocks, a two-dimensional or three-dimensional topological insulator is artificially created, depending on the intra- and interlayer coupling strengths and the number of building blocks. We show that the three-dimensional topological insulator is protected by reflection symmetry, and can therefore be classified as a topological crystalline insulator. In order to isolate the topological states from bulk states, the intralayer coupling term needs to be quadratic in momentum. It is described how such a quadratic coupling could potentially be realized by taking buckling within the layers into account. The buckling, thereby, brings the idea of stacked Rashba system very close to the alternative approach of realizing the buckled honeycomb lattice in [111]-oriented perovskite oxides.
Controlling and optimizing the morphology and microstructure of 3D interconnected activated carbons for high performance supercapacitors
Authors: Lu Yanhong , Zhang Suling , Han Xiaorong , Wan Xingchen , Gao Junlin , Bai Congcong , Li Yingxue , Ge Zhen , Wei Lei , Chen Yu , Ma Yanfeng , Chen Yongsheng
Published: November 2020

For an active electrode material, the morphology, microstructure and the effective specific surface area derived from them, have a dominant effect for the high performance supercapacitors. In this study, 3D interconnected activated carbons with controlled and optimized morphologies and porous structures were prepared from accessible carbon source and graphene oxide by a hydrothermal carbonization and following an activation method. Through optimizing the ratios of the precursors and reaction conditions, an electrode material with excellent specific surface area of 2318 m2 g−1, meso-/macro-pore ratio of 63.2% (meso-/macro-pore volume reached to 0.83 cm3 g−1), as well as an outstanding electrical conductivity of 46.6 S m−1, was obtained. The materials exhibit superior double-layer capacitive performances on a symmetric supercapacitor, delivering superior specific capacitance of 157 F g−1 in organic electrolyte system at current density of 0.5 A g−1, excellent energy density of 37.6 W h kg−1 with a power density of 7.1 kW kg−1 and good cycling stability of capacitance retention of 94% over 7000 cycles. These results offer a practical method to prepare the desired carbon electrode materials with controlled morphology and structure for high efficiency electrochemical energy storage devices.
A synergistic antibacterial platform: combining mechanical and photothermal effects based on Van-MoS2–Au nanocomposites
Authors: Cai Yujie , Wang Luyao , Hu Haolu , Bing Wei , Tian Limei , Zhao Jie
Published: November 2020

Herein, we successfully developed a new multifunctional antibacterial system, which combined mechano-bactericidal (Au-nanostars) and photothermal (MoS2) mechanism. Meanwhile, the targeting molecule of vancomycin was modified on the surface of MoS2–Au nanocomposites (Van-MoS2–Au), that generally yield high efficiency in antibacterial performance due to their effective working radii. Van-MoS2–Au nanocomposites were capable of completely destroying both gram-negative (E. coli) and gram-positive (B. subtilis) bacteria under 808 NIR laser irradiation for 20 min, and nearly no bacterial growth was detected after 12 h incubation. Moreover, these nanocomposites could destruct the refractory biofilm as well, which was a much more difficult medical challenge. The new antibacterial nanomaterials might offer many biomedical applications because of the biocompatibility and strong antibacterial ability.
Nonlinear simulations of energetic particle-driven instabilities interacting with Alfvén continuum during frequency chirping
Authors: Wang X Q , Wang H , Todo Y , Xu Y , Wang J L , Liu H F , Huang J , Zhang X , Liu H , Cheng J , Tang C J
Published: November 2020

Toroidal Alfvén eigenmodes excited by energetic particles (EPs) and their transition to energetic particle modes are investigated using a three-dimensional nonlinear kinetic-magnetohydrodynamic hybrid simulation code. Both the symmetric chirping inside the Alfvén continuum gap for upward and downward directions and the asymmetric chirping affected by the Alfvén continuum are found in the simulations depending on the EP drive and the mode damping. For weak drive and damping, symmetric frequency chirping is observed with a chirping rate consistent with the Berk–Breizman theory (Berk et al 1997 Phys. Lett. A
234 213). For moderate drive and damping, upward chirping is dominant because downward chirping is interrupted by interaction with the Alfvén continuum. For strong drive and damping, two branches of frequency chirping are found for different poloidal harmonics. The dominant chirping is downward into the Alfvén continuum and the other is an upward chirping inside the Alfvén continuum gap. The creation and the propagation of holes and clumps are found in EP phase space, which is qualitatively consistent with the Berk–Breizman theory.
Efficient experimental sampling through low-rank matrix recovery
Authors: Wübbeler Gerd , Elster Clemens
Published: November 2020

Low-rank matrix recovery allows a low-rank matrix to be reconstructed when only a fraction of its elements is available. In this paper, an approximate Bayesian approach to low-rank matrix recovery is developed and its potential benefit for an application in metrology explored. The approach extends a recently proposed Bayesian low-rank matrix recovery procedure by utilizing a Gaussian Markov random field (GMRF) prior. The GMRF prior accounts for spatial smoothness, which is relevant for applications such as quantitative magnetic resonance imaging and nano Fourier transform infrared (FTIR) spectroscopy. The approach proposed here is automatic in that its hyperparameters are estimated from the data. Application to nano-FTIR spectroscopy demonstrates that the effort required to perform experiments in the time-consuming measurement of multi-dimensional data can be reduced significantly. Software for the proposed approach is available upon request.
Role of zonal flow staircase in electron heat avalanches in KSTAR L-mode plasmas
Authors: Qi Lei , Choi M.J. , Kwon Jae-Min , Hahm T.S.
Published: November 2020

The first principle nonlinear gyrokinetic numerical simulation successfully reproduces the experimental observations of non-diffusive large scale avalanching events in a KSTAR MHD-quiescent L-mode plasma. Power law scaling of electron temperature fluctuation δT
e and Hurst exponent factor H from simulation and experiment are in good agreement. In addition, the simulation verifies that the global pattern of mean zonal flow is corrugated with staircase-like structure and responsible for the creased profile of δT
e, which is also observed in the experiment. We report on a novel finding that the zonal flow staircase constrains the radial extent of electron heat avalanches through shearing the electron temperature gradient fluctuation, while previous studies were mostly on ion heat transport.
Improved performance of electron cyclotron resonance heating by perpendicular injection in the Large Helical Device
Authors: Tsujimura T.I. , Yanai R. , Mizuno Y. , Tanaka K. , Yoshimura Y. , Tokuzawa T. , Nishiura M. , Sakamoto R. , Motojima G. , Kubo S. , Shimozuma T. , Igami H. , Takahashi H. , Yoshinuma M. , Ohshima S.
Published: November 2020

A real-time interlock system for power injection in electron cyclotron resonance heating (ECRH) was developed to be applied to Large Helical Device (LHD) plasma. This system enabled perpendicular injection, thus improving the performance of ECRH more than has ever been achieved before in LHD. Perpendicular propagation of the electron cyclotron wave at 77 GHz became more insensitive to the effect of refraction in comparison to the conventional oblique propagation. The achieved central electron temperature in the case of perpendicular injection was approximately 2 keV higher than that in the case of standard oblique injection for a central electron density of 1 × 1019 m−3 by 1 MW injection. With such improved performance of ECRH, high-density ECRH plasma of 8 × 1019 m−3 was successfully sustained after the injection of multiple hydrogen ice pellets for the first time in LHD.
Prospects for the use of methane conversion for increasing energy and environmental efficiency of energy installations
Authors: Biryuk V V , Tsybizov Yu I , Sheludko L P , Yu Livshits M
Published: November 2020

The reduction of proven hydrocarbon reserves stimulates research on the implementation of the comprehensive program “Hydrogen Energy and Fuel Cells”. The high calorific value of hydrogen and the ecological purity of its combustion products determine the prospects of using hydrogen fuel in large-scale and small-scale energetic.
Device for optical monitoring of the level and volume of liquid in a tank
Authors: Borminsky S A , Parshina A V
Published: November 2020

The article reviews theoretical base and practical implementation of device, that allows to perform optical control of level and volume of tank filling with liquid. The device implements a method, based on analysis of liquid’s mirror image. This image is shot with a camera, randomly installed in the tank. The method is also based on tank’s sectional areas data at various filling levels. Mathematical model presented in the article establishes relationship between parameters described and target values of tank level and volume. To confirm theoretical principles, there are presented results of experimental research. Experimental studies were carried out using a prototype device, monitoring level and volume of a cylindrical tank, with a diameter of 700 mm and a height of 1000 mm.
Justification of the capacity of wind-driven power-plants as part of an autonomous energy complex
Authors: Yu Ignatov V , Vdovenko I A , Nikolaev Yu E
Published: November 2020

The article considers the way of reliable energy supply of small towns by the development of an autonomous energy complex. It consists of a source using organic fuel and a source based on renewable energy. An urgent issue of such a combination is to determine the optimal ratio of installed capacity. Here we have developed the methodology to solve it. The daily and annual quantitative parameters of the autonomous energy complex were calculated, including gas turbines, wind power plants, and peak boilers. Taking into account the reservation of electric power, the optimal value of the wind turbine relative power was determined and appeared to be in the range of 0.45–0.55.
Analysis of experimental data on the hydrodynamics in a horizontal steam generator using the STEG code
Authors: Tung Le Thanh , Melikhov V I , Melikhov O I , Nerovnov A A
Published: November 2020

The new model of interfacial drag is proposed and implemented in the STEG code based on the 3D two-fluid model is presented. Experimental data obtained at the PGV test facility is used for validation of the modified STEG code. The PGV test facility comprises a model of the horizontal steam generator used for Russian type water-water energetic reactors. A quantitative comparison with experimental values of void fractions has been performed. It can be argued that the results generally indicate the relatively good predictive ability of the modified STEG code.
Collapse of a hot vapor bubble in subcooled liquid
Authors: Chung Le T , Melikhov V I , Melikhov O I , Yakush S E
Published: November 2020

Numerical simulations are performed for a spherical bubble containing hot vapor in subcooled water. Unlike conventional cavitation problems, the initial pressure in the bubble and surrounding liquid are equal to each other. The physical mechanism for the appearance of pressure difference driving the bubble collapse is rapid cooling and condensation of vapor in the bubble. A model for the fluid dynamics and thermal processes in the bubble and in the liquid is presented. The governing equations are solved numerically in the transformed coordinates where the bubble size remains constant, with the Rayleigh-Plesset equation describing the time evolution of bubble radius. The effect of the initial superheat of vapor in the bubble with respect to the saturation temperature is studied. The bubble collapse of hot vapor is compared with an idealized case, resembling collapse of a cavitation bubble. Estimates for the kinetic energy of liquid gained in the course of bubble collapse are obtained. The results are applicable to the evaluation of the perturbations to spreading melt surface due to interaction with the unstable water-vapor interface, and to the evaluation of the premixing zone in the stratified steam explosions.
Comparative exergy analysis of the processes of heating reserve liquid fuel using various coolants at thermal power plants
Authors: Orlov M E
Published: November 2020

In this paper the technologies for heating reserve liquid fuel at a thermal power plants are proposed. Provision is made to implement a transition from fuel oil to another reserve fuel that does not require high-temperature heating at thermal power plants. A comparative analysis of the traditional scheme of heating reserve fuel with industrial steam and other coolants was carried out. The analysis was carried out using the exergy method, which allows taking into account different types of power. Exergy flows, exergy losses and exergy coefficient of efficiency are calculated for traditional and proposed technologies of reserve fuel heating.
The energy efficiency research of combined H-Darier-Savonius rotors for autonomous power supply of objects on land and at sea
Authors: Shishkin N D , Ilyin R A
Published: November 2020

For the first time, the experimental energy efficiency research of combined rotors of vertical-axial wind mill based on improved H-Darier and Savonius rotors, which have blades with flaps, were performed. The experiments have shown that the maximum power factor value of combined rotors reached 0.60, which is almost 1.5–2.0 times higher than that of commercially produced horizontal-axial wind mills. The semi-empirical formula is obtained that allows determining the power factor of the combined rotor with different geometric dimensions of the H-Darier and Savonius rotors that are part of it with different numbers of stages. Energetically, economically and ecologically efficient wind mills with combined rotors with the capacity of 1–10 kW can be used for autonomous power supply of heat supply, water supply of various facilities, for oil production on land and at sea, as well as for driving propellers of small vessels.
Polygeneration plants in the energy complex of oil and gas enterprises: the concept of synthesis and a method for assessing efficiency
Authors: Dolotovsky I V , Larin E A , Semyonov B A
Published: November 2020

The article proposes a concept for the synthesis of polygeneration plants as part of the energy complex of oil and gas enterprises, which expands the possibilities of inter-industrial integration of energy and technological systems in the direction of creating closed utilization cycles. An example of a complete set of equipment for an installation for the combined generation of energy resources, water and carbon black, utilization of wastewater and low-pressure hydrocarbon gases is given. A two-dimensional model of a multi-criteria efficiency index is proposed for the analysis of performance indicators and the efficiency of integration of polygeneration units with energy technology systems of oil and gas enterprises.
Minimization of hydrogen concentration in the superheated mixture at steam turbine working fluid overheating by mixing with high-temperature products of hydrogen in oxygen combustion at nuclear power plant
Authors: Schastlivtsev A I , Borzenko V I , Shmatov D P
Published: November 2020

A new design of hydrogen-oxygen superheater with hybrid cooling of the combustion chamber with feed water and low-temperature steam is proposed for smoothening the cooling process in order to reduce the residual hydrogen content in the process steam. The combustion chamber at this design consists of two parts. In the first part, external cooling with feed water is used for smooth cooling of combustion products to 1900 … 2100 K in the most thermally stressed zone. In the second part, low-temperature steam is used as coolant for external cooling, the temperature of the generated high-temperature steam is reduced down to 1400 … 1500 K. Finally, the obtained high-temperature steam is mixed with the working fluid.
Evaluation of the efficiency of thermal power plants in variable modes taking into account equipment wear
Authors: Garievskii M V
Published: November 2020

A significant share of nuclear generation in total electricity production, an increase in the share of renewable energy sources (wind, solar, etc.), variable electricity consumption schedules and changes in electricity prices in the market necessitate the use of thermal power plants in load control mode. Using the method of calculating equivalent operating hours to account for the reduction of the service life of the main equipment, the efficiency of thermal power plants in variable modes was studied. The equivalent operating hours of the K-300-240 turbine and the prime cost of electricity of the steam turbine power unit were calculated when operating in the nominal and sliding steam pressure mode depending on the level of unloading and the rate of change of output power.
Cylindrical condenser in a liquid cleaning device
Authors: Medvedeva O N , Sautkina T N , Kalyakin A M
Published: November 2020

The article presents the results of theoretical substantiation and experimental confirmation of the effectiveness of non-reactive technologies for cleaning liquids. The method of research includes the main theoretical provisions of the process of coagulation treatment of water taking into account modern trends of its development, modern methods of using this process of water purification, laboratory and production studies on natural waters using the developed device of non-reactive water treatment. Studies of sediment kinetics when settling water after its coagulation showed that the deposition time was reduced – from 30–40 min (without additional treatment) to 8…10 min when treating a coagulant solution in a spiral coil and to 3…5 min when treating in a spiral coil with electrostatic field application.
Method of advanced channel estimation in OFDM systems by regression technique
Authors: Bashkirov A V , Chirkov O N , Romashchenko M A , Glotov V V , Turetsky A V , Glotova T S
Published: November 2020

The article considers the task of increasing the efficiency of estimating the parameters of multipath radio communication channels used in the design of mobile remote access systems with orthogonal frequency division with OFDM multiplexing. In the conditions of an ever-growing number of subscribers, an increase in transmission speed and noise immunity of mobile radio communication systems, the task of increasing the efficiency of channel estimation in multipath signal propagation remains an urgent one. It is also essential that the evaluation function was performed with minimal complexity and with high accuracy of signal recovery. Within the framework of the work, the analysis of existing algorithms, models, and methods for estimating the communication channel parameters of OFDM systems is carried out, the main differences and disadvantages are noted. A technique has been developed for estimating the complex envelope of an OFDM signal in a multipath communication channel based on regression analysis. A mathematical model for estimating a discrete multipath channel by a regression method using pilot symbols is presented. The type of the approximating function is selected, taking into account the requirements for the complexity of implementation and performance indicators. We present an algorithm for estimating the complex envelope of an OFDM signal in a multipath communication channel by the regression method.
Towards the providing of the noises cancellation in the optical systems of the distribution and detection of the optical signals
Authors: Gurov M G , Gurova E G
Published: November 2020

In this paper, the scheme of the transmission system of the optical signal with the active phase compensation is suggested. This system is used for transmission of the frequency standards optical signals, distribution and detection of the laser radiation. The principles and algorithms of such systems are shown. The feedback corrector is presented. This corrector allows realizing the long continuous operation time of the suggested transmission system with active phase compensation.
Evaluation of effectiveness of data processing based on neuroprocessor devices of various models
Authors: Romanchuk VA
Published: November 2020

The paper presents the results of studying the efficiency of information processing based on neuroprocessor devices. We define analytical relationships that characterize information processing in neuroprocessor devices using modern and frequent architectures with sets of functional technical specifications used. The proposed relationships differ in that approaches, and characteristics unique to neuroprocessor devices are offered for evaluation. The obtained relationships can be used for simulating the operation of a neuroprocessor device; analysis of the effectiveness of information processing; optimizing program code to improve performance.
Main electromagnetic jammer sources with impact on the railroad automation systems
Authors: Shamanov V I , Pultyakov A V , Trofimov Yu A
Published: November 2020

The article presents some results of research to improve the stability of rail circuits and automatic cab signaling on the Railways. Signals of automatic locomotive signaling under the influence of stationary harmonic and random impulse noise are considered, the sources of which can be power lines, power devices, radio frequency electromagnetic fields, electrostatic discharges, lightning discharges, traction power supply and rail networks, as well as adjacent rail circuits. Particular attention is paid to the negative effects of reverse traction current and the uneven magnetization of the rails. It is shown that the practical implementation and application of the developed methods to increase the reliability of automatic locomotive signaling systems should suppress powerful interference from reverse traction currents that occur on locomotive receiving coils during heavy train traffic. Also, this should provide suppression of interference from the uneven magnetic field of the rails laid in the path or in the rut and at the ends of the sleepers. This will lead to a decrease in the intensity of failures in the operation of automatic locomotive signaling and to an increase in the level of safety and uninterrupted movement of trains. The results are successfully used on the railways of Russia and abroad.
Digital watermarks with adaptive width of the informative ring in task of control signal hidden transmission at multi–agent robotics system
Authors: Shumskaya O , Iskhakova A
Published: November 2020

In the paper the relevant scientific problem of development of new methods of data transmission in mobile robotic groups is considered. The originality is defined by rapid body height of distribution of group robotics in the solution of a wide range of tasks and at the same time lack of a methodological support for formation of the safe environment of data exchange between agents in such groups. The authors offer original approach and pilot signals transformation method with function of concealment of the fact of data transmission between agents of a diverse system. The technology of digital watermarks embedding into a video stream, which is transferred in interaction of agents, is applied. The results of computing and program experiments which show effectiveness of application of the offered methodical approach regarding counteraction to the attacks, distortions and other impacts on the transmitted data caused by the difficult conditions of an actuation medium are given in work. The results show applicability of the offered approach and the method in the solution of the put-forward scientific problem on creation of effective providing in the field of control of heterogeneous robots and robotic complexes and achievement of necessary reliability level and safety.
State of the art of consumer video surveillance standards in Russia and abroad
Authors: Stupina A A , Tynchenko S V , Kukartsev A V , Lobkov K Yu , Fedorova N V , Danilchenko Y V
Published: November 2020

In recent years, video surveillance technology has been developing. The use of video surveillance has spread from national and social welfare to everyday life, and a number of consumer-grade video surveillance products have been created. However, there is a problem where the domestic market is still in a non-standard stage. Consumer-grade video surveillance system does not have specific standards, which seriously affect the consumer awareness of the consumer-grade video surveillance products. This article presents a video surveillance system and reveals the standards of an existing video surveillance system.
Converting network–unlike data into complex networks: problems and prospective
Authors: Tikhomirov A A , Berestneva O G , Mokina E , Kinash N , Kuklina M , Trufanov A I , Rossodivita A , Kuklina V , Bilichenko I , Bogdanov V
Published: November 2020

Often network science with complex networks as its basic entity has attracted scientific societies with their diverse practical capacities. Some entities (objects, processes, and data) having their built-in web nature might be considered as networks seamlessly. Contrary, network mapping for Network –Unlike Data (NUD), i.e. images and time series, is extremely complicated and manifold, so that explorers face with a tough problem which converting algorithm they should apply. We put in central focus separating data properties in line with their scale diversity – in distance, time, and nature and suggested a three step algorithm (scale-based one) to map NUD into complex networks. The algorithm was applied to networkalize two types of geographic maps of Olkhon district, Baikal Natural Territory, Irkutsk region, Russian Federation. It was underlined that the algorithm models coarse-graining and area-like linking and forms thoroughly output structures of really complex topologies with intrinsic scale-free and small world properties. In addition to simple examples transformation of NUD into multiplex networks is considered as a promising approach to study more complex systems of the real world. Networkalization concerned challenges in extracting the pertinent information from huge data resources conveyed by a network imprint for each file is also discussed.
The generalized correlating function of capillary curves and the relationship of the filtration-capacitive parameters of reservoirs in Western Siberia with the size distribution of pore channels
Authors: Akhmetov R T , Mukhametshin V V , Kuleshova L S , Grezina O A , Malyshev P M
Published: November 2020

It was shown that the Leverett J-function and the Brooks-Corey correlating function approximate the capillary curves with insufficient accuracy and therefore do not allow us to obtain an analytical expression for the density distribution of pore channels by size. The polynomial approximation proposed makes it possible to sharply increase the reliability and accuracy of the capillary curves approximation. We obtained analytical expressions that allow to get a density distribution function of pore channels by size for known values of filtration-capacitive parameters (porosity, permeability, residual water saturation). It should be noted that the correlation between the distribution of the size of the pore channels and the porometric characteristics of the reservoir can be obtained according to the geophysical methods of well research.
Enhancing cryptographic stability of applications based on the principles of dynamic polymorphism
Authors: Avetisyan B R , Pokhomchikova E O , Daudov I M
Published: November 2020

Today, encryption reflects a high level of reliability and confidentiality when working with data, both within local networks and in the global Internet network. At present, data processing has become an integral part of society. It penetrates practically the whole sphere of human activity. There are negative consequences of the development of this area. Very achievements in the field of high-tech technologies are used everywhere and are very new.
Mathematical modeling of the flood control system components presented by low-head earth dams for the Lower Kuban agricultural lands
Authors: Bandurin M A , Vanzha V V , Shishkin A S , Litovka F S , Sidakov A A
Published: November 2020

The article discusses the main parameters of the application of modern methods of mathematical modeling by the finite element method, necessary to assess the technical condition of low-head earth dams and identify their defects that impact the flood control system for protecting the agricultural lands of the Lower Kuban. The problem is in substantiating the necessity to extend the life of the of low-head earth dams of the flood control system in the Lower Kuban that are in unsatisfactory state and require modernization and reconstruction. The long-term operation of the low-head earth dams of the flood control system demands identification of defects and damage that violate the normal operation of the flood control system of the Lower Kuban; many structural elements fail, the soil base subsides, as well as the reinforced concrete lining can be completely destroyed. The most widespread, when assessing the residual life of the flood control system of low-head earth dams, is an integrated accident risk assessment. Based on the surveys, the technical condition of the low-pressure earthen dams of the flood control system of the Kuban River, over a considerable length, is assessed as emergency. Over a long period of operation, significant damage and changes to the main structures of the low-head earth dams of the flood control system have occurred. In many areas, the structural elements of the dams are washed up and weakened, in some areas, the ridge of the dams was found to subside by 30-50 cm, sediment accumulation in the channel in some areas led to a sharp reduction of the open cross section area with a simultaneous increase in erosion processes, etc. As a result of numerical experiments of mathematical modeling by the finite element method, the reliability of the low-head earth dams of the flood control system for various combinations of destructive influences is estimated.
Construction of Liapunov functions for highly nonlinear dynamic systems with feedback
Authors: Annakulova G K
Published: November 2020

The paper provides stability and qualitative research of oscillations of a highly nonlinear dynamic system with feedback. For a system satisfying Liapunov theorem, definite-positive recurrent functions of order 1 with negative derivatives are constructed. Sufficient stability conditions are established for the considered cases of power nonlinearities. Surface diagrams of Liapunov functions and their derivatives are constructed for various values of the feedback parameter. Using the Liapunov criterion, the behavior of the trajectories of dynamic system on the state planes and near the singular points is investigated. Possible limit cycles are determined based on the Poincaré method of contact curves. Integral curves and phase trajectory diagrams are constructed numerically using the Mathcad 13 software package. A transition process from an unstable focus to self-oscillating and relaxation vibration modes is established, as well as the corresponding limit cycles consistent with analytical definition of rings containing the indicated limit cycles.
The cascade equivalent A-H-circuit of the salient-pole electric machine on the base of Laplace’s equation in dimensionless Cartesian coordinates
Authors: Blanc A V
Published: November 2020

For electromagnetic calculations of electric machines, the laminated models and the cascade equivalent circuits are often used. In the laminated model, each layer corresponds to the certain structural zone of the electric machine. Analyzing the solutions of the partial differential equations for each layer, we can conclude that these solutions may be reduced to the equations of the four-terminal circuit. Thereupon, the cascade equivalent circuit of the laminated model will be synthesized. In salient-pole machines, the solutions of partial differential equations are usually formed on the base of the piecewise continuous Sturm- Liouville eigenfunctions. Unfortunately, in this case, the cascade equivalent circuits cannot be synthesized since it needs many piecewise continuous functions in the zone of poles and many smooth functions in the zone of the air gap for ensuring the uniqueness of the solution. However, the author offers the approximate method on the base of the single piecewise continuous Sturm-Liouville eigenfunction in the zone of poles and many smooth functions in the zone of the air gap. This method allows synthesizing the cascade equivalent circuits of the salient-pole electric machines. In this paper, the synthesis of the cascade equivalent A-H-circuit of the synchronous salient-pole electric machine on the base of the Cartesian model is considered. In this model, the exciting field is generated with current sheets that are located on the rotor yoke The active cell corresponding the exciting field is synthesized by means of Laplace’s equation with the single piecewise continuous Sturm-Liouville eigenfunction.
Simulation the dynamics of hub-motors of an automatic guided vehicle in occurrence of planetary gear tooth defects
Authors: Bushuev D A , Karikov E B , Rubanov V G , Alekseevsky S V
Published: November 2020

The article discusses the process of studying the dynamics of hub-motor control systems mounted in an automatic guided vehicle (AGV), in the presence of breakage of the teeth of the ring gear of the planetary mechanism using virtual prototyping technologies. A model of a two-loop pulse modulated control system for the angular velocity of the Green E-Motion hub-motors as part of an AGV with a differential drive implemented in Matlab Simulink, with the integration of the mechanical part of the virtual prototype built in MSC Adams is described. The defect and backlash in the planetary gearbox of the hub-motors were modelled using 3D contact forces. Experimental test setup for the hub-motor virtual prototype validating is presented. As a result of co-simulation, the features of the hub-motors dynamics during the rectilinear movement of AGV in the occurrence of planetary gear tooth defects are revealed.
Mathematical modeling of the influence of defects in structures of an on-farm network of rice systems on their operational reliability
Authors: Bandurin M A , Solodunov A A
Published: November 2020

This article presents the results of mathematical modeling of the effects of defects in the structures of an on-farm network of rice systems over a long period of work on their operational reliability. This year marks the ninety years since the first rice system was built in 1929 in the Kuban. In the Krasnodar Territory, rice systems have been used that have been in continuous operation for more than thirty years. Therefore, it is necessary to scientifically substantiate the costs of maintenance and overhaul, and a numerical experiment was carried out on various defects in the structures of the on-farm network of rice systems. Based on field studies, mathematical modeling was performed for the most common defects by the ground- penetrating radar (GPR) sounding—a transverse crack crossing the drainage structure, as well as the destruction of the sides of the well. All calculations were performed on the SCAD Office calculation complex. In the course of mathematical modeling, it was found that the drainage pipeline with a well has a margin of operational reliability, which decreases over the years of use of the structure. In the formulation of mathematical modeling of a model of a drainage structure with a well without defects and damages, the aim was to establish the adequacy of the solid-state model of the stress-strain state at maximum water pressure with existing field tests under various boundary conditions. According to the data of the technical analysis of operational reliability, the operational reliability of the structures of the on-farm network of rice systems is determined and characterized. Provision of the operational reliability of rice systems is to carry out engineering, technical and land reclamation measures for sustainable and effective water conservation, rational use and development of the water management complex as a whole.
Application of system analysis methods for modeling the development of hand-arm vibration syndrome: problems and approaches to solution
Authors: Diakovich M P , Krivov M V
Published: November 2020

The paper presents the approaches to the use of system analysis methods in modelling of hand-arm vibration syndrome (HAVS) in workers exposed to local vibration. The practice of using regression, information-entropy models artificial deep neural networks based on deep learning taking into account the dose of local vibration as an exposure factor is shown. The construction of HAVS occurrence model in the form of a multi-parameter regression approximated using a multilayer neural network is considered. A binary classifier that allows a set of attributes to attribute a person to a group of healthy people or to a group of people with HAVS is built. After training, the HAVS dynamics model made it possible to obtain a qualitative picture of the dependence of changes in the endocrine system on the individual experience dose of vibration and to determine the period of increased risk of pathology. The method applying to the occupational diseases differential diagnosis support system integration is discussed. Further study directions are also outlined.