bluuebunny/crossref_metadata_2025 huggingface dataset:
Classification of close binary stars using recurrence networks
Authors: George Sandip V. , Misra R. , Ambika G.
Published: November 2019

Close binary stars are binary stars where the component stars are close enough such that they can exchange mass and/or energy. They are subdivided into semidetached, overcontact, or ellipsoidal binary stars. A challenging problem in the context of close binary stars is their classification into these subclasses based solely on their light curves. Conventionally, this is done by observing subtle features in the light curves like the depths of adjacent minima, which is tedious when dealing with large datasets. In this work, we suggest the use of machine learning algorithms applied to quantifiers derived from recurrence networks to differentiate between classes of close binary stars. We show that overcontact binary stars occupy a region different from semidetached and ellipsoidal binary stars in a plane of characteristic path length and average clustering coefficient, computed from their recurrence networks. We use standard clustering algorithms and report that the clusters formed correspond to the standard classes with a high degree of accuracy.
Cross-predicting the dynamics of an optically injected single-mode semiconductor laser using reservoir computing
Authors: Cunillera A. , Soriano M. C. , Fischer I.
Published: November 2019

In real-world dynamical systems, technical limitations may prevent complete access to their dynamical variables. Such a lack of information may cause significant problems, especially when monitoring or controlling the dynamics of the system is required or when decisions need to be taken based on the dynamical state of the system. Cross-predicting the missing data is, therefore, of considerable interest. Here, we use a machine learning algorithm based on reservoir computing to perform cross-prediction of unknown variables of a chaotic dynamical laser system. In particular, we chose a realistic model of an optically injected single-mode semiconductor laser. While the intensity of the laser can often be acquired easily, measuring the phase of the electric field and the carriers in real time, although possible, requires a more demanding experimental scheme. We demonstrate that the dynamics of two of the three dynamical variables describing the state of the laser can be reconstructed accurately from the knowledge of only one variable, if our algorithm has been trained beforehand with all three variables for a limited period of time. We analyze the accuracy of the method depending on the parameters of the laser system and the reservoir. Finally, we test the robustness of the cross-prediction method when adding noise to the time series. The suggested reservoir computing state observer might be used in many applications, including reconstructing time series, recovering lost time series data and testing data encryption security in cryptography based on chaotic synchronization of lasers.
Measuring vorticity vector from the spinning of micro-sized mirror-encapsulated spherical particles in the flow
Authors: Wu Huixuan , Xu Haitao , Bodenschatz Eberhard
Published: November 2019

We demonstrate a nonintrusive technique that is capable of measuring all three-components of vorticity following small tracer particles in the flow. The vorticity is measured by resolving the instantaneous spin of the microsized spherical hydrogel particles, in which small mirrors are encapsulated. The hydrogel particles have the same density and refractive index as the working fluid—water. The trajectory of the light reflected by the spinning mirror, recorded by a single camera, is sufficient to determine the 3D rotation of the hydrogel particle, and hence the vorticity vector of the flow at the position of the particle. Compared to more conventional methods that measure vorticity by resolving velocity gradients, this technique has much higher spatial resolution. We describe the principle of the measurement, the optical setup to eliminate the effect of particle translation, the calibration procedure, and the analysis of measurement uncertainty. We validate the technique by measurements in a Taylor-Couette flow. Our technique can be used to obtain the multipoint statistics of vorticity in turbulence.
The thermoelectric properties of monolayer SiP and GeP from first-principles calculations
Authors: Jiang Enlai , Zhu Xueliang , Ouyang Tao , Tang Chao , Li Jin , He Chaoyu , Zhang Chunxiao , Zhong Jianxin
Published: November 2019

Monolayer silicon phosphide (SiP) and germanium phosphide (GeP) are predicted to exhibit fascinating electronic characters with highly stable structures, which indicate their potential applications in future electronic technologies. By using first-principles calculations combined with the semiclassical Boltzmann transport theory, we systematically investigate the thermoelectric properties of monolayer SiP and GeP. High anisotropy is observed in both phonon and electron transport of monolayer SiP and GeP where the thermal and electrical conductivity along the xx crystal direction are smaller than those along the yy crystal direction. The lattice thermal conductivity (room temperature) along the xx crystal direction is about 11.05 W/mK for monolayer SiP and 9.48 W/mK for monolayer GeP. However, monolayer SiP and GeP possess almost isotropic Seebeck coefficient, and the room temperature values with both n- and p-type doping approach 2.9 mV/K and 2.5 mV/K, respectively. Based on the electron relaxation time estimated from the deformation potential theory, the maximum thermoelectric figure of merit of monolayer SiP and GeP with n-type doping approach 0.76 and 0.78 at 700 K, respectively. The results presented in this work shed light upon the thermoelectric performance of monolayer SiP and GeP and foreshow their potential applications in thermoelectric devices.
Effects of gas pressure and discharge current on beam composition in a magnetron discharge ion source
Authors: Vizir Alexey , Oks Efim , Shandrikov Maxim , Zhang Bin , Yushkov Georgy
Published: November 2019

The magnetron discharge plasma is commonly used in thin film deposition processes, but it can also be utilized for ion beam production. We have developed and investigated an ion source based on planar magnetron discharge. We show that under certain conditions, the discharge, running in a high current pulsed mode, effectively produces plasmas with a high fraction of ions formed from the magnetron target material. The ion beam extracted from the discharge plasma and its composition were studied using a time-of-flight method. The plasma electron temperature was measured by using a double Langmuir probe. We find that the increased working gas pressure and discharge current lower the electron temperature, leading to an increased fraction of target material ions in the plasma and therefore also in the extracted ion beam due to their lower ionization potential compared to that of the working gas.
Ion source based on a circular anode layer plasma thruster
Authors: Gushenets Vasily , Bugaev Alexey , Oks Efim
Published: November 2019

A new version of pulsed ion source based on plasma thruster technology has been developed and tested. The ion source design uses a circular anode layer geometry in which the ion beam is extracted radially from the full circumference. The source has been tested for operation in argon, nitrogen, and air at a gas flow rate of up to 20 SCCM with discharge current and voltage measurements in low- and high-current modes. The source, having a simple design and open acceleration gap geometry for observation and photography, is suitable for the treatment of the inner surfaces of pipes and tubes.
Boron vacuum-arc ion source with LaB6 cathode
Authors: Gushenets Vasily , Bugaev Alexey , Oks Efim
Published: November 2019

We describe a pulsed vacuum arc ion source with a lanthanum hexaboride (LaB6) cathode for high-dose selective implantation of 10B and 11B isotope ions. The design and main parameters of the source and its plasma generator are described, and research data are reported on the formation, transport, and magnetic separation of 10B and 11B ions extracted from the erosion plasma of a vacuum arc discharge. Cathode spots are initiated by flashover across an alumina ceramic block of diameter ∼2.5 mm located at the center of the working cathode. The design of the trigger system provides rather uniform cathode erosion, and the cathode dimensions (diameter of 14 mm, length of ∼15 mm) ensure long-term operation of the source. The plasma generator operates at a pulse repetition rate of up to 10 Hz with a discharge current pulse width of 280 µs. At an arc current of 130 A, the source provides an ion beam of a rectangular cross section of 0.6 × 6 cm2 with an energy of 25 keV and amplitude up to 75 mA. A mass analyzer magnet was used for mass-to-charge separation.
GaAs x-ray detectors with sub-nanosecond temporal response
Authors: Looker Quinn , Wood Michael G. , Lake Patrick W. , Kim Jin K. , Serkland Darwin K.
Published: November 2019

Fast semiconductor radiation detectors operated in current mode provide a valuable diagnostic in pulsed power applications. Si detectors are common due to the availability of high-quality materials and mature fabrication processes, but they offer low absorption for hard x-rays above ∼10 keV. GaAs can provide increased hard x-ray absorption for the same detector volume due to a higher atomic number. GaAs photodiodes have been produced from epitaxial material grown at Sandia National Laboratories and fabricated at Sandia’s microfabrication facility. These detectors have significantly higher hard x-ray absorption (>10× at 15 keV) and nearly identical temporal impulse response to similarly sized Si detectors of 0.5 ns full-width half maximum.
Physics and engineering design of 400 keV H− accelerator for negative ion based neutral beam injection system in China
Authors: Wei Jianglong , Hu Chundong , Xie Yahong , Gu Yuming , Liang Lizhen , Jiang Caichao , Xie Yuanlai
Published: November 2019

A research project of the China Fusion Engineering Test Reactor (CFETR) Negative ion-based Neutral Beam Injection (NNBI) prototype has been started in China. The objectives of the CFETR NNBI prototype are to produce a negative hydrogen ion beam of >20 A up to 400 keV for 3600 s and to attain a neutralization efficiency of >50%. In order to identify and optimize the design of the negative ion accelerator, a self-consistent model has been developed to consider all key physics and engineering issues (electric and magnetic fields, background gas flow, beam optics, beam-gas interaction, secondary particle trajectories, power deposition on grids, heat removal design, and mounting pattern). This paper presents the primary results by applying the self-consistent model to the current design of the 400 keV H− accelerator of the CFETR NNBI prototype.
Methods and applications of energy saving control of in-wheel motor drive system in electric vehicles: A comprehensive review
Authors: Li Yong , Adeleke Oluwatobi Pelumi , Xu Xing
Published: November 2019

Energy saving techniques have been widely employed for traditional centralized motor drive electric vehicles (EVs) to improve the efficiency and driving range. Wheel motor drives, including in-wheel motor installed inside the wheel hub and near-wheel motor installed very close to the wheel hub can be controlled independently and accurately to provide drive and regenerative braking torque. Recently, wheel motor drive (WMD) electric vehicles (EVs) have been developing rapidly. However, only a few researchers have conducted a comprehensive survey on energy saving control methods and applications for WMD EVs. This paper presents a comprehensive review of energy saving methods and applications for EVs, as common approaches in energy saving and regenerative braking are reviewed. Then, regenerative braking in EV is presented in detail, including control strategies, simulation methods, energy storage system, case study, and efficiency and optimization methods. Moreover, the motor efficiency and motor loss efficiency optimization are discussed. Finally, the future research trends in energy efficiency saving control methods for EVs are elaborated. Therefore, this review not only provides a comprehensive analysis of recent energy saving control methods and applications for EVs but also demonstrates insights into new directions and optimizations for energy saving technologies for environmentally friendly and traffic-friendly EVs in a smart city.
Gallium arsenide x-ray photodiodes for ultrafast physics applications
Authors: Mandel Savannah
Published: November 2019

Gallium arsenide detectors prove to be just as good as silicon detectors with equal time resolution and greater absorption of hard x-rays.
Studying vorticity with mirror-embedded particles
Authors: Bandari Anashe
Published: November 2019

A new measurement technique improves experimental studies of turbulent flow.
Spectral representations of topological groups and near-openly generated groups
Authors: Valov V. M. , Kozlov K. L.
Published: November 2019

Near-openly generated groups are introduced. They form a topological and multiplicative subclass of

-factorizable groups. Dense and open subgroups, quotients and the Raikov completion of a near-openly generated group are near-openly generated. Almost connected pro-Lie groups, Lindelöf almost metrizable groups and the spaces

of all continuous real-valued functions on a Tychonoff space with pointwise convergence topology are near-openly generated.

We provide characterizations of near-openly generated groups using methods of inverse spectra and topological game theory.

Bibliography: 24 titles.
Partially invertible strongly dependent

-ary operations
Authors: Cheremushkin A. V.
Published: November 2019

We prove analogues of Malyshev’s theorems on the structure of finite

-quasigroups with the weak invertibility condition and of Belousov’s theorem with a description of

-associative

-quasigroups for the case of strongly dependent

-ary semigroup operations on a finite set.

Bibliography: 8 titles.
First steps towards price transparency: comparability of online out-of-pocket tools from Australian private health funds
Authors: Chalmers Kelsey , Elshaug Adam G. , Larkin Shaun
Published: November 2019

Objective
The aims of this study were to compare and contrast the information three Australian private health insurance funds (HCF, Bupa and Medibank) have provided on their online out-of-pocket cost tools and to consider the implications this has for price transparency in Australia.

Methods
Website data were downloaded from HCF, Bupa and Medibank on 18 February 2019. The information and statistics provided on these pages were reviewed, and the procedures compared across funds if their pages had referred to the same Medicare Benefits Schedule (MBS) item(s). Information was extracted regarding descriptions of the claims data used, the types of statistics provided, the out-of-pocket estimates, the total procedure cost, the MBS items referenced and the assumptions the funds described on their pages.

Results
HCF specified the MBS items used to select the claims data for their estimates, whereas Bupa and Medibank only referred to common MBS items associated with the procedures. On average, HCF had 1.44 more MBS items listed than Bupa and 2.08 more than Medibank. The funds organised procedures differently, such as HCF providing separate cost estimates for vaginal, abdominal and keyhole hysterectomy compared with Medibank’s single estimate for hysterectomy costs.

Conclusions
These funds have started to address the need for transparent out-of-pocket cost information, but the differences across these pages demonstrate complexities and the potential obfuscation of cost data.

What is known about the topic?
Out-of-pocket costs are highly variable and patient ‘bill shock’ is an increasing concern in Australia. Private insurance funds have created online tools to share procedure cost estimates based on their claims data.

What does this paper add?
This is the first review of Australian insurance funds’ price transparency tools. The cost information is difficult to interpret both within funds (for members) and across funds (for the system).

What are the implications for practitioners?
Policy makers will need to consider the complexities and presentation options for cost estimates within the health system if they move ahead with a public price transparency tool. There is still a requirement for cost information that can facilitate price shopping across providers and funders.
Field observations of the dinoflagellate genus Azadinium and azaspiracid toxins in the south-west Atlantic Ocean
Authors: Fabro Elena , Almandoz Gastón O. , Krock Bernd , Tillmann Urban
Published: November 2019

Some dinoflagellate species of the genera Azadinium and Amphidoma (Amphidomataceae) produce azaspiracids (AZA), a group of toxins responsible for gastrointestinal disorders in humans following the consumption of contaminated shellfish. In this study, we investigated the diversity, distribution and abundance of Azadinium and AZA from field plankton samples collected during four oceanographic expeditions that covered an extended area of the Argentine Sea during different seasons. Scanning electron microscopy analyses indicated the presence of five Azadinium species: Az. dexteroporum, Az. luciferelloides, Az. obesum, Az. asperum and Az. cf. poporum. Azadinium-like cells were frequently found and were even an abundant component of plankton assemblages, showing a wide latitudinal distribution, from ~38 to ~55.5°S, and occurring in a wide temperature and salinity range. High cell densities (up to 154000cellsL–1) occurred in northern slope and external shelf waters during spring. AZA-2 was detected in net samples from the 20- to 200-µm fractions by tandem mass spectrometry–liquid chromatography analysis, suggesting a transfer of AZA through the food web. Our results contribute to the knowledge of the worldwide occurrence of Azadinium species and AZA, and highlight the importance of amphidomatacean species as a potential source of AZA shellfish poisoning in the south-west Atlantic Ocean.
Implications for GP endorsement of a diabetes app with patients from culturally diverse backgrounds: a qualitative study
Authors: Ayre Julie , Bonner Carissa , Bramwell Sian , McClelland Sharon , Jayaballa Rajini , Maberly Glen , McCaffery Kirsten
Published: November 2019

Although many diabetes self-management apps exist, these are not tailored for people from culturally and linguistically diverse (CALD) backgrounds. This study aimed to explore GP perceptions of how diabetes app features could help GPs better support their patients from CALD backgrounds. Twenty-five semi-structured interviews with GPs in Western Sydney explored attitudes towards a proposed app’s suitability for CALD patients. Interviews were audio-recorded, transcribed and coded using Framework Analysis. Theme 1 explored the implications of perceptions that patients’ health literacy is dependent on the language used. Theme 2 explored the influence of messaging from sources that share the patient’s language and culture (including misinformation from community sources). Theme 3 described the suitability of the app platform for CALD patients, and its potential challenges in this group. GPs perceived that a diabetes app could be useful for providing support to patients from CALD backgrounds. Findings suggest app features should be optimised to address existing challenges that GPs face and carefully consider strategies for recruiting CALD patients. It is important that GPs feel comfortable promoting an app to their CALD patients to help increase participation rates by people in the CALD community.
Plasma anti-Müllerian hormone concentration as a predictive endocrine marker for selection of donor lambs to improve success in juvenile in vitro embryo transfer programs
Authors: McGrice Hayley , Kelly Jennifer M. , Kleemann David O. , Kind Karen L. , Hampton Alissa J. , Hannemann Patrick , Walker Simon K. , van Wettere William H. E. J.
Published: November 2019

The use of juvenile invitro embryo transfer (JIVET) is limited by variation between prepubertal lambs in ovarian response to exogenous gonadotrophins. In cattle, anti-Müllerian hormone (AMH) is a predictive endocrine marker of antral follicle count. In this study we measured plasma AMH concentrations in lambs at 3 and 5 weeks of age and determined associations between AMH concentrations and ovarian response to gonadotrophins and invitro blastocyst production at 6–8 weeks of age in a JIVET program. At 5 weeks, AMH (n=38) was positively correlated with surface antral follicle count (r=0.87, P<0.001), blastocysts produced (r=0.92, P<0.001) and blastocysts produced as a proportion of oocytes collected (r=0.44, P<0.01) or cleaved (r=0.43, P<0.01). Similar associations were observed between AMH at 3 weeks (n=30) and follicle number (r=0.70, P<0.05) and blastocysts produced (r=0.87, P<0.05). Lambs with high (>2.2ngmL−1) compared with medium (0.4–2.2ngmL−1) and low (<0.4ngmL−1) AMH at 5 weeks had more antral follicles (mean (±s.e.m.) 118.7±13.9 vs 68.2±8.1 and 30.4±12.3 respectively; P<0.05) and more blastocysts produced (mean (±s.e.m.) 54.9±6.9 vs 18.9±4.0 and 7.5±6.1 respectively; P<0.05). These results suggest that AMH concentration at 5 weeks of age can be used to select donor lambs which enhance the success of JIVET programs.
FromInternational Literatureto world literature
Authors: Ostrovskaya Elena , Zemskova Elena
Published: November 2019

This article conceptualizes translation within the theoretical framework of world literature and discusses the role of translators in the multilingual leftist literary journalInternational Literature. It focuses on the biographies and work of three translators into English: Leonard Mins, Niall Goold-Verschoyle and Anthony Wixley. Living in Moscow in the mid-1930s, they contributed to the international circulation of authors that later became part of the canon of world literature: Georg Lukács, Bertolt Brecht, and Isaac Babel. Exploring these translations within the historical context of Soviet cosmopolitanism, this article aims to uncover the mechanism by which Moscow in this period became a temporary sub-center of world literature.
The liquid state of FG-nucleoporins mimics permeability barrier properties of nuclear pore complexes
Authors: Celetti Giorgia , Paci Giulia , Caria Joana , VanDelinder Virginia , Bachand George , Lemke Edward A.
Published: November 2019

Nuclear pore complexes (NPCs) regulate all cargo traffic across the nuclear envelope. The transport conduit of NPCs is highly enriched in disordered phenylalanine/glycine-rich nucleoporins (FG-Nups), which form a permeability barrier of still elusive and highly debated molecular structure. Here we present a microfluidic device that triggered liquid-to-liquid phase separation of FG-Nups, which yielded droplets that showed typical properties of a liquid state. On the microfluidic chip, droplets were perfused with different transport-competent or -incompetent cargo complexes, and then the permeability barrier properties of the droplets were optically interrogated. We show that the liquid state mimics permeability barrier properties of the physiological nuclear transport pathway in intact NPCs in cells: that is, inert cargoes ranging from small proteins to large capsids were excluded from liquid FG-Nup droplets, but functional import complexes underwent facilitated import into droplets. Collectively, these data provide an experimental model of how NPCs can facilitate fast passage of cargoes across an order of magnitude in cargo size.
Glial SIK3: A central player in ion and volume homeostasis in Drosophila peripheral nerves
Authors: Kahanovitch Uri , Olsen Michelle L.
Published: November 2019

The electrical properties of neuronal cells rely on gradients of ions across their membranes and the extracellular fluid (ECF) in which they are bathed. Little is known regarding how the ECF volume and content is maintained. In this issue, Li et al. (2019. J. Cell Biol. https://doi.org/10.1083/jcb.201907138) identify the kinase SIK3 in glia as a key signal transduction regulator in ion and volume homeostasis in Drosophila peripheral nerves.
Structural inpainting techniques using equations of engineering physics
Authors: Barbu Tudor
Published: November 2019

A comprehensive survey on structure-based inpainting methods based on equations of engineering physics is provided in this work. Diffusion equations, describing the random motion of the micro-particles in physics, have been successfully applied in the image processing areas in the last decades. Nonlinear anisotropic diffusion-based structural inpainting techniques, using variational and non-variational PDE models, are discussed first. Influential variational interpolation approaches, such as those using the Mumford–Shah functional, total variation inpainting and its versions, and Euler’s Elastica inpainting, are addressed here. Second and fourth-order anisotropic diffusion-based interpolation schemes, some of them not following variational principles, are then presented. Our own contributions in this field are also discussed. The applications of the reaction-diffusion equations, like Ginzburg–Landau equation, describing a large variety of physics phenomena, in the inpainting domain, are described next. Structural reconstructions methods using partial differential equations for fluid dynamics, such as the Navier–Stokes equations describing the motion of the viscous fluids, are then considered here. Other state of the art third-order PDE-based structural inpainting algorithms surveyed here are based on the curvature-driven diffusion equations that use the thermal diffusion principle in physics. Fourth-order PDE-based interpolation solutions, such as Cahn–Hilliard inpainting that uses a modified mathematical physics equation describing the phase separation process, are also described.
Increase in efficiency of training process of weight-lifters on the basis of biomechanical control of current and reference trajectory of a bar
Authors: Azeev A A , Azeev A E , Zhiganova L A , Mikhailenko E N
Published: November 2019

To develop methods and technical means for recording, analysis and adjustment of the exercise biomechanics. The research is based on theoretical and experimental methods: comparative analysis, system approach, mathematical modelling and theory of experiment planning. The authors developed a complex of exercises with a system for recording, analysis and adjustment of the exercise biomechanics and the common centre of mass of the biomechanical system. A series of preliminary experiments was performed. It is assumed that the research findings will demonstrate the efficiency of applying technical means with feedback, which allow setting a right stereotype of movement basing on the prompt information analysis on the movement capabilities of a sportsman.
Application of distributed integrated modular avionics concept for perspective aircraft equipment control systems
Authors: Neretin E S , Lunev E M , Ivanov A S , Budkov A S
Published: November 2019

The paper considers the possibility of distributed integrated modular avionics concept application for control systems of aircraft equipment. This approach allows reducing the cable network weight and size, reducing the noise of transmitted data, increasing the system reliability, shortening the time of the development and further modernization. As a result, the design of system and component part is proposed.
Automated support for spacecraft onboard equipment design on the basis of a heterogeneous model
Authors: Isaeva O S , Mishurov A V , Koldyrev A Yu , Chernigovskiy A S , Kamyshnikov A N , Evstratko V V
Published: November 2019

This article presents methods and software tools for modeling and analysis of space system onboard equipment operation. The authors suggest the design of a heterogeneous model uniting knowledge bases and virtual devices simulating work of data reception and transmission equipment. Model design considers tasks appearing during preparation of satellite production at a company-manufacturer of the space industry. The model can be used at the stages of designing and testing of the onboard equipment. For design support, the model allows assessment of parameters of the reception-and-transmission path and of destabilizing factor influence on communication line quality. For ground test support, the model simulates functions of the onboard equipment during command-and-software control of a spacecraft, providing reception and transmission methods for a wide range of commands and methods of generation of telemetry frame values. The comparison of precedents obtained during simulation tests with the results of the finished equipment testing, allows determination of special features of the onboard system operation that can stay unnoticed if other methods of test preparation and analysis are applied.
Influence of the initial state of a distributed system on the optimal control of quartz optical fiber drawing
Authors: Pervadchuk V P , Vladimirova D B , Gordeeva I V
Published: November 2019

An optimal control problem for a distributed system with compromise control is considered out of this work. The solvability is shown and an optimization system is obtained for the optimal control issue with boundary monitoring and boundary supervision described by equations of melts continuity and movement. An algorithm for implementing the optimal control problem is suggested and the outcome is analyzed. The issue is resolved for a few types of initial conditions used with the radius deviation function from its programmed determination.
Method of processing a distorted signal of a MODE-S format from an airplane transponder
Authors: Meltsov V U , Lapitsky A A
Published: November 2019

The article describes a rather efficient method for processing a signal of the MODE-S format, which has distortions in amplitude and timing parameters. Distortion can be caused by various factors, such as the presence of interference in the air and the reflection of the signal, the impact of various electromagnetic fields. Receiving and further processing of the signal with distortion can not be performed correctly using simple algorithms that do not take into account these features. The method described below allows processing part of the distorted signals correctly and increasing the total number of decoded signals. MODE-S is part of a large air traffic processing and monitoring system. Today, a large number of civil aircraft are equipped with receivers and transponders of signal in MODE-S format. This system allows identifying aircraft and obtaining the necessary information about the flight in a simple way. MODE-S works on the question-answer principle. The so-called “question” is sent to the aircraft in order to obtain specific information about the flight. The aircraft accepts this “question”, analyzes its format and, depending on it, sends an “answer” back. It is very important to process correctly as many signals as possible, because the information in them is important and must be received on time.
Comparison of the miniaturization efficiency of the coupler using the bends of quarter-wave segments
Authors: Hung L Q , Quan D M , Tan P H
Published: November 2019

This article analyzes the efficiency of micropolice bending line for minaturization compared to artificial transmission lines. Simple bending of the line allows reducing the area of the coupler only by no more than 50%, this is due to the limited space inside the coupler. While the artificial transmission lines can provide a reduction in the area of more than 60%.
Model of inertial navigation system for unmanned aerial vehicle based on MEMS
Authors: Parfiriev A V , Dushkin A V , Ischuk I N
Published: November 2019

The article presents data on the software and hardware implementation of the algorithm for determining Euler angles (roll, pitch and yaw) based on MEMS using a complementary filter. The yaw angle is calculated from the readings of the magnetometer. The angles of roll and pitch are calculated from the accelerometer and gyroscope readings with their subsequent integration to improve the determination accuracy. A prototype model of an inertial navigation system was assembled using the GY-9250 module and the Arduino UNO board, which have high performance at low cost and low power consumption.
Research on monolayer h-BN cell strain effect vacancy stability
Authors: Serzhantova M V , Titov M A , Obvertkin I V
Published: November 2019

This article presents a research on Hexagonal Boron Nitride (h-BN) monolayer cell strain effect 2 % and 4 %. Structure of h-BN with nitrogen vacancy, with boron vacancy and with divacancy was considered for this. The calculations were carried out within framework of the density functional formalism with gradient corrections and using the VASP package. Vanderbilt Ultra-Soft Pseudopotential was used in the course of the calculations. It is possible to conclude that nitrogen vacancies are the most stable, regardless of monolayer deformation on the results obtained. Understanding of atomic scale stability and dynamics of defects in such systems is crucial for predicting their properties and applications in electronics.
Simulation of the ball mill loading movement and study of its operation modes depending on geometrical parameters of the lining
Authors: Fadin Y M , Khakhalev P A , Degtyarev P A
Published: November 2019

The article analyzes virtual experiments of the lining of a ball-type drum mill depending on a number of factors: the diameter of a mill, the diameter of grinding bodies, the number and height of liner lifters. The numerical experiment was performed using the EDEM software; a parametric model of the mill housing with variable liner lifters was created and imported, studies were performed using the virtual simulation method. A virtual experiment made it possible to study the grinding process without interacting the equipment which eliminates the risk of injury during and allows for more accurate research data. As a result of simulation of virtual experiments, values of the average kinetic energy of grinding bodies and the number of their collisions were determined.
Instability of the Ni-Al combustion wave in the Zeldovich-Barenblatt parameters
Authors: Gulyaev P , Dolmatov A , Jordan V
Published: November 2019

The study of the thermal structure of the combustion wave of self-propagating high-temperature synthesis using differential chronoscopy (DCS), using the example of the Ni-Al system, demonstrates the possibility of estimating the criterion of thermal diffusion instability of the front in accordance with the Zeldovich-Barenblatt model. The application of standard image recognition methods, in the form of a high-speed Trace-transform algorithm, to a 2D chronogram of the interframe difference in the coordinates of the combustion front, calculated from high-speed video recording of the propagation of a SHS wave as a DCS-map, demonstrates the ability to control the sustainability mode of the burning wave in situ.
Technological capabilities of direct-flow stabilizers in gas-piston engines
Authors: Bashmur K A , Petrovsky E A , Geraschenko Yu A , Makolov V A , Tynchenko V S , Shadchina Yu N
Published: November 2019

The present study describes problems related to the rational use of associated petroleum gas. In particular, the problem of effective gas flow stabilization at the gas-piston engine outlet is investigated. The analysis is applied to such kind of engine stabilizers and detailed studies revealed their major drawbacks. A hypothesis concerning the efficiency of using a direct-flow stabilizer (turbulizer/swirler) as a flow stabilizer is proposed. Simulation flow modeling in the direct-flow stabilizer is carried out. The simulation is carried out with the help of the SolidWorks Flow Simulation program for different profiles of the stabilizer flow section. The hypothesis on the efficient use of such units is confirmed. In terms of flow swirling the most effective flow section of the direct-flow stabilizer is revealed.
Intensification of the grinding process in vibration mills
Authors: Bogdanov V S , Bogdanov N E , Bogdanov D V , Samsonova P S
Published: November 2019

The paper deals with the problems of intensification of grinding in vibration mills with harmonic, biharmonic and polyharmonic vibrations. In particular, as one of the ways to solve this problem, it is suggested to use the adjustable amplitude-frequency characteristics of the movement of the vibrator with polyharmonic vibrations. The paper presents a new design of the vibration mill with polyharmonic vibrations, which has three vibratory drives mounted on the grinding chamber with the possibility of varying the frequency, direction of rotation, mass of unbalanced masses, as well as the geometric arrangement of the vibratory drives relating to the axes passing through the center of gravity of the vibration mill.
Simulation of manufacturing systems using BPMN visual tools
Authors: Vlasov A I , Gonoshilov D S
Published: November 2019

The paper presents results of the methodology research related to simulation of manufacturing systems in the context of electronic product manufacturing using BPMN visual tools. Modern production of electronic equipment is a complex, distributed, multi-factor system, regarded as a socio-production system, which is a part of a more global socio-economic system. The authors provided the algorithm to synthesize integrated visual models of distributed socio-production systems. There is also a brief overview of main BPMN visual tools. Based on the research findings, the authors provided recommended applications of BPMN tools.
Radiation-resistant robotic manipulator controlled by 6-DoF haptic control device to perform technological tasks in hot cells
Authors: Prikhodko V V , Sobolev A A , Zhukov A V , Chavkin E M , Fomin A N , Levshchanov V V , Pavlov S V , Svetukhin V V
Published: November 2019

The paper describes the results of developing a radiation-hardened robotic complex including the following original constituting elements: a robotic manipulator with a 2-finger gripper, a 6-DoF control device with force feedback, control software. The implementation of rotational motion of joints of the robotic manipulator through coaxial gear shafts resulted in its high resistance to ionizing radiation of up to 107 Gy. The control device features high ergonomics similar to that of mechanical master-slave manipulators. The control software has a modular structure and contains both original and the state-of-the-art program components. A prototype of the robotic complex was built which demonstrated the capability of performing typical technological operations in a demo hot cell in both manual and automated modes.
Device for electropulse press-fitting of pipes into a tube sheet of shell-and-tube heat exchanger
Authors: Shalaurov R S , Tynchenko V S , Petrovsky E A , Bukhtoyarov V V , Kukartsev V V , Tynchenko V V
Published: November 2019

The article presents theoretical information about pulse methods of press-fitting pipes into the tube sheet of a shell-and-tube heat exchanger. The analysis of the existing designs of devices for electropulse press-fitting pipes in the tube sheet is made; the weaknesses of these devices are identified. The design of the device for press-fitting into the tube sheet by the electropulse method is developed, which is devoid of the disadvantages of the designs considered in this article. A distinctive design decision is the use of a reusable shank with a support flange. The shank is made of metal and is presented in the form of bellows compensator. The second distinctive decision is the use of a gap sealer between the device body and the pipe, which has no chemical affinity with the device body. The paper describes in detail the principle of operation of the proposed device. In addition the authors developed a drawing of the proposed design of the device for press-fitting pipes into the tube sheet of the shell-and-tube heat exchanger.
Hierarchical object recognition system in machine vision
Authors: Kokoulin A N , Yuzhakov A A , Kiryanov D A , Stanisavljevic N , Batinic B
Published: November 2019

Authors propose an efficient architecture of the hierarchical machine vision system and the multimedia transfer algorithm for a distributed client-server system which can adapt to mobile network speed variations. This algorithm is based on the wavelet transform of an input multimedia source and allows for data exchange using all the available bandwidth of the unstable mobile network. The main principle of the hierarchical recognition system is the distributed processing network utilizing the “coarse-fine” paradigm in computer vision. Each source of a video stream is processed in-place by the tiny SoC computer which acts as an Edge Computing Unit and detects the presence of an object fragment in a video frame and crops the bounds of the ROI. The resulting stream containing ROI is directed to the main server if the object is detected, reducing traffic and resource consumption.
Determination of the working area and singularity zones of the 3-RRR robot based on the non-uniform coverings method
Authors: Rybak L A , Gaponenko E V , Malyshev D I , Behera L
Published: November 2019

The paper considers the optimization algorithms applied to define the working area of a flat 3-RRR-mechanism. The system of inequalities considering the acceptable range of an argument of driving angles arcsine was used to define the working area. The condition of equality of Jacobian matrixes to zero for the first and second type of singularities was used to define special positions. The paper presents the results of modeling for eight combinations of rotation angles of driving pairs. The received results can be used to choose the geometrical parameters of a 3-RRR mechanism setting the boundaries of the working area through the technological process and to plan the movement trajectory of an output link to avoid uncontrollable mobility or jamming of the mechanism in special positions.
New methods for manufacturing composite materials
Authors: Zagorodnuk L Kh , Lesovik V S , Elistratkin M Y , Sumskoy D A , Makhortov D S , Zolotykh S V
Published: November 2019

The law of affinity of structures developed by the authors is based on basic properties and regularities inherent in the basic and bonding material and the combination of properties that ensure properties of the contact layer for reliable and durable construction operation. In recent decades, new composites with a number of required physical, mechanical and operational properties have been developed. To produce modern efficient materials which would be uniform, strong and durable, it was proposed to apply the law of affinity of structures.
Correlation analysis of the dependence of the properties of steel on its composition based on the processing of reference information
Authors: Evdokimov R A , Derbisher E V , Derbisher V E , Germashev I V
Published: November 2019

In the article the possibility of identification of grade steel properties on the platform “structure - properties” dependence by the linear correlation analysis of information from standard reference books is considered. Clearly significant coefficients of correlation are found for a number of the alloying elements. The results can be used for forecasting of physic and mechanical properties of alloys with the alloying additives.
Plasma hardening of medium carbon steels
Authors: Safonov E N , Mironova M V
Published: November 2019

The structure, size and hardness of the zone of hardening of pre-annealed steels (30XHMA, 34XH1M, 35XH2Φ, 38XΓH, 40XHMA, 40XH2MA, 45) was studied after treatment with a plasma arc of direct polarity. It was shown that plasma hardening forms a thin layer of martensitic-austenitic structure with variable composition and hardness on the treated steel surface. The zone subjected to hardening was represented by marten site of different dispersion and ferrite veins. Between the quenching zone and the base metal there was a transition zone with a gradient structure of plate perlite and elements of perlite-ferrite base, the share of which was gradually increasing. The structural-phase structure of this zone provided a smooth transition of mechanical properties from the hardened layer to the base metal. Dependences for management of a structural condition, hardness and depth of a zone of hardening were determined.
Method for studying mixed problems in modeling structurally inhomogeneous materials with coatings
Authors: Pavlova A V , Telyatnikov I S
Published: November 2019

The paper investigates steady-state oscillations of an elastic medium of a layered structure, containing internal defects such as flat cavity-cracks and coating, using the differential factorization method. Systems of integral equations that describe relations between stresses and displacements in the planes of layer separation with jumps of displacements on the crack faces are constructed. The authors obtain solutions of the resulting integral equation systems for particular cases of areas occupied by defects in the final form using the Wiener-Hopf integral factorization methods or the methods of fictitious absorption.
Reactivity of dispersed schungite to bitumen
Authors: Vysotskaya M A , Kuznetsov D A , Lukash E A , Kharlamov E V
Published: November 2019

Some aspects of the use of schungite mineral powder to obtain effective compositions based on bitumen are considered in this paper. The high reactivity of dispersed schungite to bitumen is shown. The studies are performed by studying the water extracts from suspensions, as well as the state of the surface of the powders and the concentration of active surface centers using the indicator method of fixing the distribution of adsorption sites (DAS) in the spectrophotometric version. Based on the analysis of the results obtained it is concluded that the molecules of organic substances contained in bitumen can actively interact with the surface of schungite. At the interface between the binder and schungite the processes take place that are accompanied by the formation of a strong adsorption layer which is necessary for the formation of a high-quality and durable composite. The presented studies of asphalt binders confirm the conclusions and show that asphalt concrete pavements using shungite mineral powder will be able to work in a wider temperature range both for high summer and low winter temperatures.
Radioactive and non-radioactive aerosol permeability through two types of analytical filters
Authors: Khalaf H N B , Mostafa M Y A , Zhukovsky M
Published: November 2019

AFA analytical filter is the most used one of Petryanov filters in health protection and radiometric and analytical measurements. Therefore, the properties of this filter like efficiency and the permeability of the non-radioactive and radioactive aerosol particles are more important for accurate estimation and protection. AFA Petryanov filters (RSP-20 and RMP-20) are the most popular filters in Russia. In this work, an experimental setup has been constructed to estimate the permeability of the non-radioactive and radioactive aerosol particles through these two type of analytical filters. A standard radon chamber (2 m3), at Ural federal university is used to create radioactive aerosol. Non-radioactive aerosol or ambient aerosol is considered from ambient indoor air. Aerosol diffusion spectrometer (ADS) is used to measure aerosols concentration and number size distribution with range from 1 nm to 10 μm. The activity size distribution is determined with screen diffusion battery and the AIP-2 cascade impactor with range (0.5-20μm). The measurements are repeated before and after filters to study the PFs filters dispersion and permeability for non-radioactive and radioactive aerosols. ADS filter is used to measure the aerosol concentration and number size distribution before and after filters in ambient air with spatial construction. The effect of size modes of the non-radioactive and radioactive aerosols penetrating the filters is studied. At low aerosol concentration, the filters catch all free unattached radon decay products (RDPs) (1-5 nm) and the most collected activity with active median thermodynamic diameter, AMTD, ∼ 20 nm. In the radon chamber at high aerosol concentration, the activity of RDPs free unattached fraction nearly removed. The collected activity with AMTD ∼ 20-40 nm is more significant.