bluuebunny/crossref_metadata_2025_split huggingface dataset:
Robust and accurate decoding of hand kinematics from entire spiking activity using deep learning
Authors: Ahmadi Nur , Constandinou Timothy G , Bouganis Christos-Savvas 
Published: January 2021

Abstract

Objective. Brain–machine interfaces (BMIs) seek to restore lost motor functions in individuals with neurological disorders by enabling them to control external devices directly with their thoughts. This work aims to improve robustness and decoding accuracy that currently become major challenges in the clinical translation of intracortical BMIs. Approach. We propose entire spiking activity (ESA)—an envelope of spiking activity that can be extracted by a simple, threshold-less, and automated technique—as the input signal. We couple ESA with deep learning-based decoding algorithm that uses quasi-recurrent neural network (QRNN) architecture. We evaluate comprehensively the performance of ESA-driven QRNN decoder for decoding hand kinematics from neural signals chronically recorded from the primary motor cortex area of three non-human primates performing different tasks. Main results. Our proposed method yields consistently higher decoding performance than any other combinations of the input signal and decoding algorithm previously reported across long-term recording sessions. It can sustain high decoding performance even when removing spikes from the raw signals, when using the different number of channels, and when using a smaller amount of training data. Significance. Overall results demonstrate exceptionally high decoding accuracy and chronic robustness, which is highly desirable given it is an unresolved challenge in BMIs.
Dynamics of impulse seals with tubular feeders
Authors: Martsynkovskyy V A , Hudkov S M , Zahorulko A V , Kundera Cz 
Published: January 2021

Abstract
The paper presents a technique for calculating forced axial oscillations and stability of impulse seals with tubular feeders. Unlike the existing methods of calculation, wherein, for the sake of simplicity, the influence of the feeder conductance is neglected, this article describes a conductance effect on the dynamic characteristics of the impulse face seal. The proposed calculation technique makes it possible to determine amplitudes of forced oscillations of the axially movable bushing and stability limit for the geometric parameters chosen in the static calculation. As an example, the authors described a calculation of the impulse face seal of the rotor of the main Reactor Coolant Pump (RCP 20000-100). The amplitude and phase-frequency characteristics for different values of the nominal gap are constructed.
Research of strength characteristics and optimization of parameters of case structures using holographic interferometry
Authors: Dzyuba A P , Selivanov Yu M 
Published: January 2021

Abstract
The article presents a method for studying the strength characteristics and optimizing the parameters of the casings of pumping and compressor equipment, gearboxes, motors, etc. structures by the reduced density of stripes on their holographic interferograms. It was used to study the properties of a cylindrical shell with an optimal reinforcing pad in the zone of action of a radial concentrated force. A rational redistribution of the material of the ribbed plate, bent by a transverse concentrated force, has been carried out. The deformation of the crankcase of the gearbox and clutch of a car in all gears is investigated, recommendations are given for the rational redistribution of its material. The results show that holographic interferometry makes it possible to assess the advantages of the optimal designs obtained, allows to significantly expand the class of hull structures, for which a high level of design solutions can be effectively implemented to ensure their rational parameters.
Nonequidistant antenna arrays synthesis based on genetic algorithm
Authors: Oznobikhin V I , Romodin V B , Shebalkova L V 
Published: January 2021

Abstract
A new approach to the synthesis of nonequidistant antenna arrays with uniform distribution based on the Genetic Algorithm of the global extrema search is introduced and analyzed. The technique is demonstrated for various uniform antenna array structure. The radiation pattern of the nonequidistant antenna array is formed using the Genetic Algorithm to reduce a side lobe level. A mathematical formula is presented to highlight the operation of objective function minimization.
Principles of manufacturing of DC on-board harness for a spacecraft based on 3D technology
Authors: Efremov S , Karpov N , Leonov A 
Published: January 2021

Abstract
This article describes in detail principles of manufacturing of DC on-board harness for spacecraft based on a new 3D design technology. This technology puts together all activities of on-board harness production, starting from electrical design and up to the final product readiness. Based on the analysis performed we proposed: necessary software, methods of wires and connector contacts connection, applicable wires and connectors available in Russian and European markets, shielding and insulating materials, test methods. The article discusses benefits of lightweight supply buses technology implementation (as compared to bundle of wires), which are: mass reduction, electrical performances stability improvement, lesser capacity between supply lines, better interference immunity, better thermal performances.
Recognition of english and russian-language texts based on frequency characteristics
Authors: Kotov Y , Sanina O 
Published: January 2021

Abstract
Distinction of texts in one language from texts in others is necessary to solve the problems of automated text analysis. The paper presents criteria and critical values for recognizing English-language and Russian-language texts. The obtained criteria are estimated by experiments. The paper describes the methods to estimate the size of character codes and to identify a space character in a text. The algorithm for recognizing texts in the English and Russian languages with arbitrary encoding is studied and its accuracy is estimated experimentally.
Optimal voltage regulator of power supply system for submersible processing equipment
Authors: Bukreev V G , Rulevskiy V M , Shandarova E B , Bystrov E A 
Published: January 2021

Abstract
The article considers the synthesis of the optimal voltage regulator for the electric power supply system of the electromechanical complex of the submersible apparatus with the power transmission through the cable line. Based on the reduced linearized model of the multidimensional nonlinear control object the regulator with adjustable parameters is synthesized, providing the DC voltage stabilization at the power supply system load. The variant of building proportional feedback on output state variables is used for the regulator in the system with parametric and external disturbances. Due to the technical impossibility of measuring the voltage on the load, a combined optimal regulator with negative feedback is organized, which makes it possible to stabilize the voltage at the payload within the specified limits when receiving data from the output filter of voltage source inverter.
Knowledge models in computer-aided manufacturing systems
Authors: Zakharova A A , Grebenyuk Y V 
Published: January 2021

Abstract
Despite of vast amounts of information and considerable opportunities to process it with computer-aided manufacturing systems, personal experience and lore of experts become a role-defining category in the issues of creating and making technical decisions. This should be factored into the process of creating instruments for decision making, which are based on computer-aided manufacturing systems. Efficient decision-making models, as well as models of factors (determinants) evaluation, should include expert knowledge data. In this connection, it is of burning importance to find ways to formalize expert knowledge into a code readable by computer-aided manufacturing systems. The research paper presents three determinant (criteria) evaluation models which help make technical decisions. The models include expert knowledge data formalized by means of linguistic variables. The research paper also presents recommendations on how to opt for a proper model, including requirements, and peculiarities of expert information collection matters.
Intelligent analysis of digital economy competencies in agriculture labor
Authors: Aletdinova A A , Bakaev M A , Astapchuk V A 
Published: January 2021

Abstract
As information becomes the main resource and production factor, there is widely declared need for digital competencies and skills in employees. This demand is uneven between industries and regions and is often biased due to companies’ and organizations’ desire to “keep up with the times”. In our paper we focus on employees’ digital economy competencies in agriculture, which is traditionally considered a rather low-tech sector, and compare them to several other industries with varying degrees of informatization. To negate the possible biases, in our analysis we rely on online data – vacancy ads published by companies at job-related portals – instead of traditional statistics. The online data was collected by our dedicated labor market monitoring intelligent system that has been in operation since 2011. The digital economy competencies were divided into 6 types: 1) intellectual and educational, 2) communicational, 3) motivational, 4) managerial, 5) ICT, and 6) ecological. We further use the groups and the wordings of the competences in online job-related ads to fill-in the “competencies specifications” thesaurus. Finally, we calculate frequencies for the digital economy competencies in vacancies for the different industries. We found that in agriculture the most demanded were the intellectual and educational, managerial and ICT-related ones.
Crowd intelligence methods for identifying corruption-prone legislative acts
Authors: Rakhvalova D , Kurcheeva G , Rakhvalova M , Bakaev M 
Published: January 2021

Abstract
The article is dedicated to the problems in automation of anti-corruption expertise of legislative acts, which gets increased attention within today’s Computational Law field. We carried out the analysis of the corruption-related factors frequency and outlined approaches for assessing the risks involved with their presence in a legal document. The frequency was classified per the identified attributes of regulatory legal acts: the year of adoption, the social field of the legal regulation, the level. The analysis of legal documents was carried out using the “crowd-intelligence” approach – performing relatively elementary tasks of annotating data for machine learning by people who are not expert lawyers. The results of our work can contribute to improving the effectiveness of anti-corruption expertise and support decision-making by the experts in the field.
New technology for assessing platelet aggregation activity
Authors: Tyutrin I I , Li L , Gubarev F A , Zhukov E L , Slizevich D S , Liushnevskaya I D , Kalganov I S 
Published: January 2021

Abstract
In this paper, we discuss an application of the method of the Digital Laser Speckle Image Correlation method (DIC) for studying the aggregation function of platelets in whole blood with the maximum standardization of the pre-analytical and analytical stages of the study. Materials and images are provided, methods are explained.
Research on the effect of test parameters on signal contrast and accuracy of determining the size of a defect
Authors: Radchenko V , Palumbo D , Ryngach N , Bobin K , Kurlaev N 
Published: January 2021

Abstract
Currently, is used several non-destructive testing methods for detecting defects in the composite materials. The most potential is methods non-contact scanning for a large surface area with relative insensitivity to environmental disturbances. In this regard, are developed methods for defect detection in composites, all of which have own peculiarity. A fundamental difference concerns the overall length of time is required for non-destructive testing and analysis of thermographic data from the infrared camera, first of all, for large-scale structure. This research work has been conducted a quantitative way of analyzing data to optimizing the testing parameters in terms of testing time and signal-to-noise ratio. In particular, were carried a few tests out on stringers of carbon fiber reinforced panels. These tests included lock-in thermography technique with simulated defects, which has been used for finding parameters to correct detect dimensions of defects.
Analysis of the FACTS devices impact on the transmission line protection operation
Authors: Ruban N Yu , Gusev A S , Bay Yu D , Razzhivin I A 
Published: January 2021

Abstract
The effect of the static synchronous compensator (STATCOM) on distance protection of a high-voltage transmission line is studied in this article. To carry out the research stated in the topic of the paper, an experimental scheme was developed, equipment was selected, the operation settings of the 3 stages of distance protection were calculated and quad characteristics were built on their basis. All listed above, as well as further experiments, were carried out by the real time digital simulator. The STATCOM model was integrated in the scheme and set next. A series of experiments was carried out: two-phase and three-phase short circuits in various nodes of the scheme with and without the compensator and in various connection nodes. After all the experiments were carried out, appropriate conclusions were made about the impact of FACTS devices on the operation of distance protection. Possible ways to solve detected problems were also proposed.
Visual shape and position sensing algorithm for a continuum robot
Authors: Manakov R A , Kolpashchikov D Y , Danilov V V , Laptev N V , Skirnevskiy I P , Gerget O M 
Published: January 2021

Abstract
Continuum robots represent an actively developing and fast-growing technology in robotics. To successfully implement control and path planning of continuum robots it is important to develop an accurate three-dimensional shape and position sensing algorithm. In this paper, we propose an algorithm for the three-dimensional reconstruction of the continuum robot shape. The algorithm is performed during several steps. Initially, images from two cameras are processed by applying pre-processing and segmentation techniques. Then, the gradient descent method is applied to compare two-dimensional skeleton points of both masks. Having compared these points, it finds a skeleton of the robot in a three-dimensional form. Additionally, the proposed algorithm is able to define key points using the distance from the robot base along the center line. The latter allows controlling the position of points of interest defined by a user. As a result, the developed algorithm achieved a relatively high level of accuracy and speed.
Technology of partial discharge detection by means analysis of impulse interaction
Authors: Mytnikov A , Strugov V 
Published: January 2021

Abstract
In this paper the approach based on impulse analysis for partial discharge (PD) control and identification for high voltage insulation are summarized and the experimental research of impulses of different nature for detection some typical PD defects are discussed. Some physical effects at different voltage levels are shown and a method for the representation and characterization of the PD is introduced. Special test cells with different types of defects such as a streamer corona and pore inside oil-paper insulation of condenser type are used for the investigations. The experimental procedure for PD identification by means of impulse form transformation is shown and discussed. Experimental equipment and measurements are described. It is shown that using of impulse of nanosecond duration and commutative impulse allows the characterization and controlling PD in high voltage insulation.
Model of on-line control for the smart object by communication technologies
Authors: Maksimova Y A , Barchukov D , Slobodyan S 
Published: January 2021

Abstract
Based on analysis of opportunities of usage existing models, methods and techniques for on-line monitoring and control of unmanned dynamic objects, a mathematical model of remote estimation of distance to wire-controlled unmanned mobile object is proposed. The presence of model and techniques of remote estimation of distance to wire-controlled unmanned object increases the reliability of control for exclusion of critical situations in the strict radio counteraction conditions and powerful electromagnetic jamming setting during control.
Varying spatial orientation of photoelectric panels as method of managing graph of electric energy generation
Authors: Daus Y , Yudaev I , Desyatnichenko D 
Published: January 2021

Abstract
One of the main issues in the determining layout of photovoltaic installations is choosing optimal parameters for photovoltaic panels and auxiliary equipment and duplicating energy sources, which makes it possible to justify economically the electrical energy generation. Regularity of solar radiation variation for the studied geographical point throughout the year, and the influence of atmospheric phenomena, as well as the dynamics of daily and seasonal electrical energy consumption must be considered, which will help to predict the operation mode of the plant, and match generation and consumption schedules. Variation of tilt angle of the photovoltaic module receiving surface relatively to horizon and cardinal points makes it possible to manage the schedule of power generation at solar plant and to match it with the load curve, due to the maximum possible convergence of them, as change in the spatial orientation of the photovoltaic panel surface makes it possible to shift the maximum of solar radiation flux in time. The results of the experimental research also revealed the dependence of the current produced by the photoelectric panel on its spatial orientation due to the change of the incoming solar radiation flux on it.
Glass composite modified with silicon carbide and gallium arsenide, that absorbs electromagnetic radiation
Authors: Kazmina O V , Semenova V I , Dorozkin K V 
Published: January 2021

Abstract
The possibility of using waste of semiconductor manufacturing containing silicon carbide and gallium arsenide as an effective additive in radio absorbing material preparation was established as a result of research. The resulting material meets the requirements of effective porous electromagnetic radiation absorbers of extremely high frequency range: maximum absorption and minimum reflection of electromagnetic radiation, fire safety, the minimum allowable level of toxic and hazardous substances.
Studies of integrated natural capillary-porous coatings
Authors: Genbach A A , Bondartsev D Y , Beloev H I 
Published: January 2021

Abstract
There were developed devices with porous coatings that can eliminate the appearance of cracks in the chambers and nozzles due to the powerful thermodynamic screen of three heat sources, and to arrange cutting of reinforced concrete structures with detonation high-temperature flares flowing from combustion chambers and nozzles cooled by capillary-porous coatings. In studies, the holography method was used. The expected economic effect from the one burner is approximately 200-300 $. The environment needs to be reduced by the cooling system’s energy consumption. The studied chambers and burners can be implemented in the thermal power plants, especially in the gas turbine equipment. Capillary-porous and flow-through cooling systems demonstrated high reliability, however, the first system can reduce the cooler consumption by tens of times (up to 80 times). The design and manufacturing of hybrid porous surfaces make them integrated and multifunctional, provides the possibility to work with higher critical loads, and enables a mobile process for monitoring the limiting condition of coatings.
A study of thermal devices with porous coatings
Authors: Genbach A A , Bondartsev D Y , Beloev H I 
Published: January 2021

Abstract
Thermal devices (mechanisms) with porous coatings designed for combustion chambers of gas turbine units, as well as for cutting and drilling turbo foundations of power plants, which solve the problem affiliated with the appearance of cracks from the reflected wave, have been developed and studied. The porous coating provides a powerful thermodynamic screen in the similitude of three heat sources. The studies were unleashed on five samples with different porosity and hardness values (5 ÷ 30%). Thermal movements, deformations, and stresses were recorded on a holographic unit in real-time. A thermal device in the form of a rocket-type burner with a detonation jet has proved high efficiency for a capillary-porous and flow-through cooling system. Photographs of combustion chambers and nozzles studied depending on their geometry and thickening of the nozzle wall, an excess oxidizer (0.3 ÷ 0.8), and operating conditions until of the metal limiting condition (1106 W/m2) are presented. The optimal geometry of the chambers and nozzles either the type of porous structure was specified. It has been found that the economic effect is 200-300 $ for 1 burner, and the consumption of coolant is reduced several times.
Effect of tool travel speed on tensile strength of friction stir welded dissimilar joint of aluminium AA6061 T6 alloy and maraging M250 steel
Authors: Karthikeyan M , Jonah  
Published: January 2021

Abstract
Friction stir welding (FSW) is a promising welding method to produce dissimilar joints between steel and aluminium. The formation of the intermetallic compound layer at the dissimilar joint interface affects the joint mechanical properties, which are also influenced by the FSW process parameters. In the present research work, M250 Maraging steel and AA6061 T6 aluminium alloy were joined by FSW. The joints were prepared with five different tool travel speeds ranging from 0.33 mm s−1 to 1 mm s−1 using a tapered tool pin made by tungsten carbide material, keeping tool rotational speed constant. The welded joints were analyzed for their tensile behaviour and microstructural change, including hardness measurement. The failed samples are analyzed using a scanning electron microscopy device for their mode of failure. In the Energy Dispersive X-Ray Spectroscopy (EDS) analysis, the formation of intermetallic compound (IMC) layers of Fe3Al, Fe4Al13, and Fe2Al5 are observed. When the thickness of the IMC layer increases, the joint strength decreases. It is found that the welding speed influences the thickness of the IMC layer formed, causing variation in the strength of the dissimilar joint. Better joint efficiency is obtained at a tool travel speed of 0.67 mm s−1.
Advances in reconfigurable optical design, metrology, characterization, and data analysis
Authors: Kim Dae Wook , Smith Greg A , Dubin Matt , Lowman Andrew , Oh Chang-jin , Quach Henry , Kang Hyukmo , Yoo Hyemin , Trumper Isaac , Graves Logan , Aftab Maham , Davila-Peralta Christian , Hyatt Justin , Choi Heejoo 
Published: January 2021

Abstract
Reconfigurable freeform optical systems greatly enhance imaging performance within non-symmetric, compact, and ergonomic form factors. In this paper, several advances improve design, testing, and monitoring of these systems. Specific enhancements include definition of polynomials for fast and efficient parameterizations of vector distributions in non-circular apertures and merit based function optimization. Deflectometry system improvements enable metrology for almost any conceivable optic shape and guide deterministic optical figuring process during the coarse grinding phase by including modulated infrared sources. As a demonstration of these improvements, parametric optimization is tested with the tomographic ionized-carbon mapping experiment, a reconfigurable optical system. Other case studies and demonstrations include metrology of a fast, f/1.26 convex optic, an Alvarez lens, and real-time monitoring of an array of independently-steerable hexagonal mirror segments as well as an induction formed surface and inflatable Mylar mirror.