bluuebunny/crossref_metadata_2025 huggingface dataset:
The preparation and properties of TiO2 nano-porous layers for perovskite solar cells
Authors: Liang Xiaoping , Lian Ziwei , Zhu Jing , Men Kuo , Wei Feng
Published: January 2020

In this paper, we investigated different TiO2 nanoporous layers on the performance of perovskite solar cells. The structure and morphology of TiO2 nanoporous layers were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. It indicates that the order of crystalline rutile TiO2 nanorod porous layers is better than that of anatase TiO2 nanotubes and anatase TiO2 nanoflowers. The optical reflectance properties of FTO/TiO2 nanoporous layers and the optical absorption properties of the FTO/TiO2 nanoporous layers/CH3NH3PbI3 structure were analyzed by ultraviolet visible absorption spectroscopy. The performance of perovskite solar cells with different TiO2 nanoporous layers was tested by using a current-voltage curve.
Mitigation of tipping point transitions by time-delay feedback control
Authors: Farazmand Mohammad
Published: January 2020

In stochastic multistable systems driven by the gradient of a potential, transitions between equilibria are possible because of noise. We study the ability of linear delay feedback control to mitigate these transitions, ensuring that the system stays near a desirable equilibrium. For small delays, we show that the control term has two effects: (i) a stabilizing effect by deepening the potential well around the desirable equilibrium and (ii) a destabilizing effect by intensifying the noise by a factor of (1−τα)−1/2, where τ and α denote the delay and the control gain, respectively. As a result, successful mitigation depends on the competition between these two factors. We also derive analytical results that elucidate the choice of the appropriate control gain and delay that ensure successful mitigations. These results eliminate the need for any Monte Carlo simulations of the stochastic differential equations and, therefore, significantly reduce the computational cost of determining the suitable control parameters. We demonstrate the application of our results on two examples.
Viscoelastic behavior corresponding to reptative relaxation times across the λ-transition for liquid elemental sulfur
Authors: Stashick Mitchell J. , Marriott Robert A.
Published: January 2020

Continued interest regarding the rheometric measurements of molten sulfur has persisted due to the need for industrial-scale transportation and handling of the material in a liquid phase. This has allowed for extended research developments to attain a fundamental understanding of the fluid. This work reports novel high temperature modulus data over the λ-transition region for liquid elemental sulfur, measured through the use of a modified Anton-Paar Modular Compact Rheometer 302. From these measurements, further insight was gained on the viscoelastic behavior and reptative relaxation times for liquid elemental sulfur. The slow relaxation time, τs, related to reptative behavior, was found to be between 0.24 s and 0.28 s at 190 °C. Utilizing the Maxwell relation, this was determined to correspond to an estimated viscosity range from 72 000 × 10−3 Pa s to 95 000 × 10−3 Pa s, which is in agreement with previous viscosity studies on liquid sulfur. A Cole–Cole plot of the experimental data also displayed characteristics of Debye-like relaxation, suggesting that the slow relaxation process was related to local S-S bond scission and recombination in sulfur chains and was not a relaxation coinciding with a polymeric chain mode. Finally, consecutive heating and cooling of the sulfur sample gave replicate values up to 210 °C on the third heating cycle, where an apparent structural change took place possibly due to cycling over the secondary transition, producing a thermal history, or sulfur reactions with trace impurities. This 210 °C temperature was found to have some recurrence within the literature.
To see C2: Single-photon ionization of the dicarbon molecule
Authors: Harper Oliver J. , Boyé-Péronne Séverine , Garcia Gustavo A. , Hrodmarsson Helgi R. , Loison Jean-Christophe , Gans Bérenger
Published: January 2020

The C2 carbon cluster is found in a large variety of environments including flames, electric discharges, and astrophysical media. Due to spin-selection rules, assessing a complete overview of the dense vibronic landscape of the C2+ cation starting from the ground electronic state X Σg+1 of the neutral is not possible, especially since the C2+ ground state is of X+ Σg−4 symmetry. In this work, a flow-tube reactor source is employed to generate the neutral C2 in a mixture of both the lowest singlet X Σg+1 and triplet a 3Πu electronic states. We have investigated the vibronic transitions in the vicinity of the first adiabatic ionization potential via one-photon ionization with vacuum ultraviolet synchrotron radiation coupled with electron/ion double imaging techniques. Using ab initio calculations and Franck-Condon simulations, three electronic transitions are identified and their adiabatic ionization energy is determined Ei(a+ 2Πu←X 1Σg+)=12.440(10) eV, Ei(X+ 4Σg−←a 3Πu)=11.795(10) eV, and Ei(a+2Πu ← a3Πu) = 12.361(10) eV. From the three origin bands, the following energy differences are extracted: ΔE(a − X) = 0.079(10) eV and ΔE(a+ − X+) = 0.567(10) eV. The adiabatic ionization potential corresponding to the forbidden one-photon transition X+ ← X is derived and amounts to 11.873(10) eV, in very good agreement with the most recent measurement by Krechkivska et al. [J. Chem. Phys. 144, 144305 (2016)]. The enthalpy of formation of the doublet ground state C2+ cation in the gas phase is determined at 0 K, ΔfH0(0K)(C2+(Πu2))=2019.9(10) kJ mol−1. In addition, we report the first experimental ion yield of C2 for which only a simple estimate was used up to now in the photochemistry models of astrophysical media due to the lack of experimental data.
Charge generation dynamics in hematite photoanodes decorated with gold nanostructures under near infrared excitation
Authors: Okazaki Masahiro , Furube Akihiro , Chen Liang-Yih
Published: January 2020

Photochemical water splitting offers a useful solution for efficient energy conversion into hydrogen gas. Hematite has been focused on this purpose as the photoanode due to the advantages of low-cost, chemical stability, and suitable bandgap. The photocatalytic ability, however, is limited by the short-lived carriers and lack of photoresponse in the near infrared (NIR) region. As a solution, combining hematite with a noble metal can enhance the photocatalytic performance toward longer wavelength. Gold nanoparticles indicate characteristic absorption in the visible and NIR regions and photo-induced injection of electrons into the semiconductor. In this study, a hybrid material of hematite photoanodes with gold nanostructures was fabricated and the carrier dynamics under NIR excitation was elucidated by femtosecond transient absorption spectroscopy. The observed strong positive absorption under NIR excitation of Au nanorods (NRs) on the hematite anode indicated an increased electron density in hematite due to electron transfer from AuNRs, demonstrating efficient charge carrier generation in hematite by the decorated gold nanostructure.
Preparation of macrocyclic musks via olefin metathesis: comparison with classical syntheses and recent advances
Authors: Sytniczuk Adrian , Milewski Mariusz , Kajetanowicz Anna , Grela Karol
Published: January 2020

Recent advances in the synthesis of macrocycles with musk scent via catalytic olefin metathesis are presented with a particular emphasis on advantages offered by the metathesis technology. The review includes short historical background about musks and olefin metathesis to introduce the subject. Substantial emphasis is given on ring-closing metathesis (RCM) as a tool for the synthesis of cyclic compounds such as civetone, muscone, exaltolide, ambrettolide/isoambrettolide, and yuzu lactone.

The bibliography includes 106 references.
First observations of white sharks (Carcharodon carcharias) attacking a live humpback whale (Megaptera novaeangliae)
Authors: Dines Sasha , Gennari Enrico
Published: January 2020

To date, white shark (Carcharodon carcharias) feeding events involving large whales have largely been described only in terms of observed scavenging events. Scavenging occurs in all ecosystems and is usually associated with stochastic feeding events. In marine ecosystems, whale carcasses commonly provide these community-wide food web events. Whale carcasses are the single largest source of carrion in marine ecosystems, to the extent that they are thought to constitute an important part of large white shark foraging ecology, shaping many aspects of the life history of the sharks, including adult migrations. However, to date, no part of this white shark feeding event has been described involving a live whale. To the best of our knowledge, here we provide the first published description of white sharks attacking and killing a live humpback whale (Megaptera novaeangliae). The attack displayed novel behaviours, including evidence of the ‘bite and spit’ tactic, rarely described in non-pinniped-related white shark feeding events before and all part of a tactical timeline of an attack that is precise, deliberate and effective.
Effect and prediction of aromatic oil on swelling degree of direct-to-plant SBS modifier in bitumen
Authors: Zhang Wengang , Jia Zhirong , Wang Fang
Published: January 2020

The effects of aromatic oil on the swelling degree of the modifier in bitumen were analyzed from macro and micro perspectives. The evaluation indicator of swelling degree was put forward and the prediction model of swelling degree was established. The result shows that the swelling
degree of direct-to-plant SBS modifier in bitumen can be evaluated by the structure fineness of SBS after swelling. There is an optimal content of aromatic oil makes the direct-to-plant SBS has the best swelling degree. The swelling degree determines the performances of the direct-to-plant
SBS modified bitumen to a certain extent.
Alternative splicing potentiates dysfunction of early-onset epileptic encephalopathy SCN2A variants
Authors: Thompson Christopher H. , Ben-Shalom Roy , Bender Kevin J. , George Alfred L.
Published: January 2020

Epileptic encephalopathies are severe forms of infantile-onset epilepsy often complicated by severe neurodevelopmental impairments. Some forms of early-onset epileptic encephalopathy (EOEE) have been associated with variants in SCN2A, which encodes the brain voltage-gated sodium channel NaV1.2. Many voltage-gated sodium channel genes, including SCN2A, undergo developmentally regulated mRNA splicing. The early onset of these disorders suggests that developmentally regulated alternative splicing of NaV1.2 may be an important consideration when elucidating the pathophysiological consequences of epilepsy-associated variants. We hypothesized that EOEE-associated NaV1.2 variants would exhibit greater dysfunction in a splice isoform that is prominently expressed during early development. We engineered five EOEE-associated NaV1.2 variants (T236S, E999K, S1336Y, T1623N, and R1882Q) into the adult and neonatal splice isoforms of NaV1.2 and performed whole-cell voltage clamp to elucidate their functional properties. All variants exhibited functional defects that could enhance neuronal excitability. Three of the five variants (T236S, E999K, and S1336Y) exhibited greater dysfunction in the neonatal isoform compared with those observed in the adult isoform. Computational modeling of a developing cortical pyramidal neuron indicated that T236S, E999K, S1336Y, and R1882Q showed hyperexcitability preferentially in immature neurons. These results suggest that both splice isoform and neuronal developmental stage influence how EOEE-associated NaV1.2 variants affect neuronal excitability.
Sudden Brans–Dicke singularities
Authors: Barrow John D
Published: January 2020

We show that cosmological sudden singularities that respect the energy conditions can occur at finite times in Brans–Dicke and more general scalar-tensor theories of gravity. We construct these explicitly in the Friedmann universes. Higher-order versions of these singularities are also possible, including those that arise with when scalar fields have a self-interaction potential of power-law form.
Soft x-ray tomography measurements in the Wendelstein 7-X stellarator
Authors: Brandt C , Schilling J , Thomsen H , Broszat T , Laube R , Schröder T , Andreeva T , Beurskens M N A , Bozhenkov S A , Brunner K J , Card A , Cordes C , Damm H , Fuchert G , Gallowski K , Gutzmann R , Knauer J , Laqua H P , Marquardt M , Nelde Ph , Neuner U , Pasch E , Rahbarnia K , Recknagel J , Schülke M , Scott E R , Sieber T
Published: January 2020

The soft x-ray tomography diagnostic in the stellarator Wendelstein 7-X consists of twenty pinhole cameras, up–down symmetrically arranged in a poloidal, triangular cross-section of the plasma vessel. The x-ray emissivity is measured with 16 bit amplitude resolution at 2 MHz sampling rate along 360 lines-of-sight by silicon photodiode arrays. In the recent operation campaign data acquisition (DAQ) has been working reliable for the conducted plasma pulse lengths <1 min, however the DAQ system are ready for the foreseen 30 min plasma pulse lengths of upcoming campaigns. The bandwidth of the preamplifiers is ≈200 kHz and the sensitive energy range is approximately 1–12 keV. The measurements indicate the up–down symmetric emissivity distribution in the triangular poloidal cross-section. First tomographic reconstructions of different magnetic field configurations are consistent with the theoretically calculated flux surface topology.
MoRe/YBCO Josephson junctions and π-loops
Authors: Faley M I , Reith P , Satrya C D , Stolyarov V S , Folkers B , Golubov A A , Hilgenkamp H , Dunin-Borkowski R E
Published: January 2020

We have developed Josephson junctions between the d-wave superconductor YBa2Cu3O7−x
(YBCO) and the s-wave Mo0.6Re0.4 (MoRe) alloy superconductor (ds-JJs). Such ds Josephson junctions are of interest for superconducting electronics making use of incorporated π-phase shifts. The I(V)-characteristics of the ds-JJs demonstrate a twice larger critical current along the [100] axis of the YBCO film compared to similarly-oriented ds-JJs made with a Nb top electrode. The characteristic voltage I

c

R

n
of the YBCO–Au–MoRe ds-JJs is 750 μV at 4.2 K. The ds-JJs that are oriented along the [100] or [010] axes of the YBCO film exhibit a 200 times higher critical current than similar ds-JJs oriented along the [110] axis of the same YBCO film. A critical current density J

c
= 20 kA cm−2 at 4.2 K was achieved. Different layouts of π-loops based on the novel ds-JJs were arranged in various mutual coupling configurations. Spontaneous persistent currents in the π-loops were investigated using scanning SQUID microscopy. Magnetic states of the π-loops were manipulated by currents in integrated bias lines. Higher flux states up to ±2.5Φ0 were induced and stabilized in the π-loops. Crossover temperatures between thermally activated and quantum tunneling switching processes in the ds-JJs were estimated. The demonstrated ability to stabilise and manipulate states of π-loops paves the way towards new computing concepts such as quantum annealing computing.
The synthetic double wavelength technique: a simple robust method for thermodynamic temperature determination
Authors: Briaudeau Stéphan , Bourson Frédéric , Kozlova Olga , Sadli Mohamed , Razet Annick
Published: January 2020

This paper describes a new relative technique developed at LNE-Cnam, for the determination of the thermodynamic temperature of blackbodies without recourse to a radiometric reference. This technique is referred to as the ‘synthetic double wavelength technique’ (SDWT) as it is considered to be a particular case of the ‘double wavelength technique’ (DWT). It offers a new experimental technique for the determination of the thermodynamic temperature at high temperature and as such a new means for the mise-en-pratique of the new definition of the kelvin achievable by any national metrology institute provided a multi-wavelength radiation thermometer combining large and narrow bandwidths is available. In this work, a first experimental implementation of this technique based on a wavelength-tuneable spectroradiometer providing both narrowband and broadband signals with the particularity of the broadband signal being virtually synthesised from the spectral distribution of the narrowband signals sampled over a wide spectral range. SDWT determination of the thermodynamic temperature of a blackbody at 2760 K was performed with a level of uncertainty that confirms the promising capabilities of this technique.
Response of precipitation extremes to warming: what have we learned from theory and idealized cloud-resolving simulations, and what remains to be learned?
Authors: Muller Caroline , Takayabu Yukari
Published: January 2020

This paper reviews recent important advances in our understanding of the response of precipitation extremes to warming from theory and from idealized cloud-resolving simulations. A theoretical scaling for precipitation extremes has been proposed and refined in the past decades, allowing to address separately the contributions from the thermodynamics, the dynamics and the microphysics. Theoretical constraints, as well as remaining uncertainties, associated with each of these three contributions to precipitation extremes, are discussed. Notably, although to leading order precipitation extremes seem to follow the thermodynamic theoretical expectation in idealized simulations, considerable uncertainty remains regarding the response of the dynamics and of the microphysics to warming, and considerable departure from this theoretical expectation is found in observations and in more realistic simulations. We also emphasize key outstanding questions, in particular the response of mesoscale convective organization to warming. Observations suggest that extreme rainfall often comes from an organized system in very moist environments. Improved understanding of the physical processes behind convective organization is needed in order to achieve accurate extreme rainfall prediction in our current, and in a warming climate.
History of Iceland formation as main Arctic crossroad
Authors: Gekht A B , Yu Eidemiller K , A Kudryavtseva R-E , Samylovskaya E A , Kulik S V
Published: January 2020

Despite its geographical remoteness from continental Europe, Iceland, a small island state in the Northern Atlantic, has been an important part of not only civilized Old World spaces, but also an appreciable element in the economic and political life of the Northern European region. Being the homeland of one of the oldest parliaments in the world, small Iceland has steadily taken high positions in various ratings of the states’ development and well-being, showing that even severe climatic conditions are not an obstacle to successful development.
Organizing an oil transportation system in the Arctic
Authors: Agarcov S , Kozmenko S , Teslya A
Published: January 2020

Development of the Arctic has become the subject of intense attention due to the region’s vast hydrocarbon resources. However, severe environmental conditions and large distances greatly increase the development costs. Because of this, it is crucial to organize rational logistics routes within the Arctic communications system. In recent years, Russia has been taking on a leading role in transportation of hydrocarbons, including oil; there is growing demand from the global community for steady supply of Russian crude oil and petroleum products. At the same time, difficult weather and ice conditions along with poor infrastructure make it a challenge to establish a system for offshore transportation of oil in the Arctic. The paper reviews the Russian experience of sea transportation of oil from the Pechora Sea and the Gulf of Ob, describing a scheme using modern shuttle tankers of reinforced ice class. Apparently, ice tankers of Arc6 and Arc7 classes can be used with virtually no assistance from icebreakers provided that ice conditions are relatively favorable. The unique experience of cooperation in transportation projects accumulated by Russian oil and gas operators, shipping and shipbuilding companies, and financial organizations should prove useful for further development of natural resources of the Arctic.
Ways of developing tourism logistics in the far north of Russia
Authors: Antipov S K , Anosova N E , Aladyshkin I V , Kolomeyzev I.V. , Ishankhodjaeva Z R
Published: January 2020

The paper describes the current state of national and international tourism in the Karelian Republic. The authors outline the possible ways of further development of tourism in this region, as well as the ways of attracting both national and international tourists to the region, which is important for the national image. The analysis of the current situation shows that at present there is no adequate infrastructure in Karelia that could satisfy the tourists’ needs.

The paper discusses the infrastructure of this Arctic region and highlights the main indicators and factors characterizing the touristic field. The authors propose an algorithm and a model for tourism development in Karelia - the subarctic region of the Russian Federation.
Overview of the International Conference “Advanced Technologies in Aerospace, Mechanical and Automation Engineering – MIST: Aerospace-II”
Authors: Kovalev Igor V , Voroshilova Anna A
Published: January 2020

The overview describes the main directions and results of the II International Conference on Advanced Technologies in Aerospace, Mechanical and Automation Engineering - MIST: Aerospace-2019 held in Krasnoyarsk in November 18-21, 2019. It gives the details about the participants and the proceedings.
Heat calculation unit in the mathematical model of air separation plant evaporator-condenser
Authors: Chernenko V V , Chernenko D V
Published: January 2020

The thermal calculation, which is part of the mathematical model of a condenser-evaporator of cryogenic air separation plants, is considered. The calculation is based on solving the criteria equations of heat exchange for cases of condensation outside of the pipe and evaporation inside the pipe. The thermal calculation is preceded by a hydraulic calculation, the results of which are used as input quantities. The solution is carried out by a multistep (iterative) method. The heat flow density on the evaporation side is used as a criterion for convergence of iterations. The calculation scheme, divided into successive steps, is shown. The calculation results are used to determine the geometric configuration and the main characteristics of the condenser-evaporator.
Most important factors affecting radio frequency characteristics of microwave cable assemblies
Authors: Bolshakov D A , Trifanov I O , Burdukovskaya N N , Shugurova K V
Published: January 2020

The evolution of satellite communications systems results in more stringent on-board and ground equipment specifications for gain/temperature, performance variations, impedance matching quality. The use of cable assemblies capable to meet the increased requirements is essential for signal transmission between the units without any performance degradation. Taking into account the variety of microwave cables and connectors it is necessary to establish the selection criteria for parts and techniques of manufacturing microwave cable assemblies for satellite communications systems. This paper contains the analysis of the technological aspects of cable assemblies manufacturing which impact the radio frequency characteristics of end items.
Protection of high frequency generators with unstable load
Authors: Samoylov A G , Samoylov V S , Samoylov S A , Tahar Al
Published: January 2020

Methods of adaptive matching of variable load impedance with RF energy sources are investigated. A gradient algorithm for controlling the adaptation process is proposed. Model and full-scale experiments were carried out, which confirmed the effectiveness of the protection of high-frequency generators from fluctuations in load impedance.
Design and monitoring of oil and gas industry facilities based on the use of ultra-light aviation and digital technologies
Authors: Topchiev A G
Published: January 2020

The current stage in the development of the information support of the oil and gas complex is is characterized by the transition from corporate information and reference geographic information systems (GIS) to the development and creation of automated information-analytical and information-management systems. Traditional GIS – technologies provide optimal organization and comfortable access to databases of geographically distributed information. The new generation of GIS is designed, in addition to providing information and reference functions, to solve a set of tasks for managing complex multi-level geotechnical systems (GTS) of oil and gas condensate fields for the purpose of rational nature management and sustainable development of natural and man-made GTS.
Economic efficiency of the application of additive technologies based on laser direct metal tooling in the production of aircraft parts
Authors: Levashkin D , Vasilyev F
Published: January 2020

The paper discusses the issues of the feasibility study on the integration of additive manufacturing technologies into classical technological chains. Using the aviation part as an example, we consider a model for the formation of technological costs for the classic and proposed versions of its manufacturing technology. A comparative parametric analysis of the cost of production of aircraft parts of this type was performed according to two options.
On the choice of in-process allowance for hardening
Authors: Bachurin A S , Kourlaev N V
Published: January 2020

The influence of allowance value on residual hardening stresses is researched. A new indicator is proposed to compare the effect of different values of the interoperative allowance for hardening on the workpiece leashes. The results of the change in the value of the allowance in the technological process of production of large-sized parts of modern civil interregional aircraft using the new indicator proposed by the authors are presented.
Information and space technologies in the development of hunting and domestic reindeer husbandry
Authors: Salman A L , Savchenko A P , Grebel G , Okhlopkov I M , Savchenko P A , Dubintsov S A , Soukhovolsky V G , Muravyov A N
Published: January 2020

Based on an analysis of the results of using specialized collars with beacons of the Argos satellite system (manufactured by ES-PAS LLC) for wild reindeer movements, the possibility of using new beacons for remote monitoring of domestic animals grazing is considered. It is planned not only to select the optimal functioning parameters of the device for animal husbandry (location accuracy, frequency of data transmission to satellites, duration of autonomous functioning, etc.), but also to add new features that allow the use of satellite collars not only as a means of tracking animals, but also for studying the features of their behavior. Comparison of animal behavior information with Earth remote sensing data can be used to optimize pasture management. When forming the database, the possibility of organizing a system for managing the load on pastures, including an assessment of the overall potential for the development of livestock in a given territory, is considered.
Probability prediction of the appearance of overload cycles of variable load case in parts of the aircraft chassis
Authors: Kravchenko G N , Popov Yu I , Kravchenko K G
Published: January 2020

Distribution function of the maximum values of voltage overload cycles in some aircraft parts is proposed. Based on the data from the flight experiment, more than 100 records of random load case processes were schematized and processed statistically. The proposed model of the distribution of maximum load cycles and processed experimental data has been verified.
Experimental research of dynamic characteristics of electro-backup hydraulic actuator at the load test-rig of flight control systems
Authors: Alekseenkov A S , Erofeev E V , Khaletskiy L V
Published: January 2020

The trend in aircraft systems development to overall electrification includes electrification of flight control actuation system. Generally, there’re two main technologies of «electrical» actuation, which use the power of on-board electrical system to move the aerodynamic surfaces. These technologies are electro-hydrostatic (EHA) and electromechanical (EMA) actuation systems. This paper describes the results of the dynamic testing of electro-backup hydraulic actuator (EBHA), which is one of the possible solutions for actuation systems of the next-generation flying vehicles.
Planar multigraphene/SiC blade-shaped field emission nanostructures
Authors: Jityaev I L , Svetlichnyi A M , Kolomiytsev A S
Published: January 2020

This paper reports on study of blade-shaped field emission nanostructures based on multigraphene films on silicon carbide. We carry out numerical simulations of the distribution of the electric field in a nanoscale interelectrode gap of a planar field emission cell. The simulation parameters are based on the dimensions of the experimental sample of a planar emission cell with a blade-shaped emitter. Design of the field emission cell aimed at minimizing the local field amplification at the emitter corners have been proposed. The initial difference in the electric field strength at the corners of the emitter and in the center was 2.5 times. The proposed design allows to obtain the electric field strength at the corners corresponding to the values in the center of the emitter.
Assessment of ontological structures semantic similarity based on a modified cuckoo search algorithm
Authors: Kravchenko Y , Bova V
Published: January 2020

Enhancing the effectiveness of knowledge (information) classification and integration based on an assessment of semantic similarity of ontological structures is an urgent scientific problem. Evaluation of equivalent semantic similarity requires considerable computational resources. Consequently, a similarity of predicates of all ontologies’ concepts shall be verified in the exhaustive search. Exact methods do not allow to find a solution in polynomial time, since this problem is trans-computational and requires the use of random search approaches with decentralized control. The paper proposed a modification of the algorithm, inspired by the behavior of cuckoos in the process of nesting parasitism. The cuckoo search optimization algorithm increases the stochasticity of obtained quasi-optimal solutions in comparison with other bioinspired algorithms and increase the search speed. A comparative analysis of the results quality showed that solutions, obtained by the cuckoos’ search, outperform the results of other bioinspired approaches.
Analysis of integral characteristics in the IoT system
Authors: Lvovich I Ya , Lvovich Ya I , Preobrazhenskiy A P , Preobrazhenskiy Yu P , Choporov O N
Published: January 2020

The paper discusses the features of solving problems related to the modelling of information in the Internet of things in the organizations of the agricultural sector. The quality conversion method in numerical estimates is proposed. As a result of ranking indicators according to the degree of decrease or increase in their significance, each linguistic value can be assigned a certain rank. The integrated characteristics based on normalized indicators and scores in the organisations are shown. The features of using a combination of several methods for processing and modeling of reduced monitoring information in the Internet of things system are given.
Model studies of systems with diagnostics based on fault simulation
Authors: Pankov D A , Denisova L A
Published: January 2020

The paper deals with the system diagnostics and search failures in the work of complex information systems. The question of using statistics to implement routing algorithms in the system is considered. The results of the experiment on defects detection of routing and control algorithms for information statistics devices are presented for the simulated system. Fuzzing technique is used to eliminate complex problems after failure detection. The set of requirements and components is defined for integrate node validation algorithms into the routing environment of the information system.
An experimental bench for testing the cracks detecting technology in the blades of working aircraft engines
Authors: Grinkrug M S , Balli M Kara , Tkacheva J I , Novgorodov N A
Published: January 2020

The work is devoted to the development of technology for detecting cracks in the aircraft engines blades during an airplane flight without stopping it. For these purposes, a method is proposed and an experimental installation is designed to verify it and obtain results for the application of this technology in practice. The main experimental tasks are set, which are planned to be worked out on this installation.
The use of inhibited layers to improve mechanical properties of thermoset composite materials
Authors: Protsenko A E , Telesh V V , Potkalov A K
Published: January 2020

The present paper discusses the research data on strength properties of polymer composite materials using fiberglass reinforced plastic (FRP) as an example. During the process of fiberglass reinforced plastic curing with the use of hot molding, a thermal gradient inevitably appears throughout the material thickness. This phenomenon results in uneven curing of prepreg layers. Internal stress consequently occurs in the material. It is proposed to control the kinetics of binder curing throughout the material thickness by introducing an inhibitor into the various prepreg layers. Multichannel dielectric analysis was used to study the curing kinetics of fiberglass reinforced plastic. It has been found that the time spread for gelation is 8.6 min in the 15-layer sample. The study of strength properties of the obtained samples demonstrates an increase in flexural strength of PCM-modified samples by 12.7% – 17.7% and a reduction in their anisotropy.
Quartz optical cells with alkali-metal vapour for aerospace
Authors: Khripunov S A , Kobtsev S M , Radnatarov D A , Andryushkov V A
Published: January 2020

This work for the first time analyses the impact of cosmic radiation on quartz cells with rubidium vapour and buffer gas, as well as the ensuing change in stability of atomic frequency standards (AFS) relying on such cells. It is demonstrated that the main effect consists in variation of partial pressure of nitrogen, which is a part of the buffer gas mix. This leads to degraded AFS stability. It was established by modelling that this effect is not significant because material degradation of the AFS stability is only likely to happen over a long period of time, as long as several decades. It can be concluded on the basis of the proposed analysis that a gas cell with rubidium vapour and buffer gas is the most reliable element of a satellite-borne AFS and that it is less affected by exposure to ionising radiation than electronic components of AFS.
Adaptive vulnerability detection model for unmanned vehicles drugs based on artificial immune systems
Authors: Skatkov A V , Bryukhovetskiy A A , Moiseev D V
Published: January 2020

The adaptive model and structure of the intrusion detection system (IDS) based on the analysis of traffic in the channel “UMV-dispatch center”, which is based on immunological principles, is proposed. Rules classify objects belonging to several classes at the same time with different degrees of belonging. Recognition of the state of network traffic is carried out in conditions of lack of a priori information about the properties of the intrusion source and the stochastic nature of the recognized events. To increase the level of reliability of intrusion detection in the system, adaptive dynamic adjustment of decision-making rules on classification and operational States of UMV traffic is performed.
Heat transfer coefficient of laminar rotational flow
Authors: Zuev A A , Arngold A A , Levko V A , Maksimov I A , Leonenkov A D
Published: January 2020

A model of the distribution of laminar temperature and dynamic boundary layers is considered. An integral relation is derived for the energy equation of the temperature spatial boundary layer, that allows integration over the surface of any shape, which is necessary for determining the thickness of the energy loss., The expressions for the thickness of the energy loss of the temperature spatial boundary layer are defined for the laminar flow. The expressions for the thickness of the energy loss are necessary to determine the local heat transfer coefficients for the characteristic cases of flow, taking into account heat transfer. Analytically, expressions are obtained for determining the local heat transfer coefficient in the form of the Stanton criterion for the rotational flow according to the law of a solid and the rotational flow of a free vortex. Local heat transfer coefficients are determined for laminar rotational flows.
Modelling race conditions in multithreading programs in terms of Petri nets
Authors: Kharitonov D I , Odyakova D S
Published: January 2020

The article describes an approach to detecting race conditions with respect to a variable in a program, based on the automatic construction of a program model in terms of Petri nets. A simple sample program having race condition is given and the analysis of its behavior shows four different results of execution due to the race condition. Compositional model of the program in terms of Petri nets is presented that illustrates the process of automatic model generation. Notions of program control flow, global area and environment models are introduced. Reduction rules for the control flow model are defined and compositional representation of reduced program model is described. The formula for detection of race conditions is defined as: for a race conditions to occur, it is necessary that between the moment a variable is read by a thread and the moment this thread writes to a variable, an event of writing to the variable by another thread may occur. Compositional model of global variable capable of intercepting writing to variable events that lead to race condition is presented. By synchronizing the program control flow model with the global variable model it is possible to detect race conditions by building the reachability tree and checking for the presence of error event in it.
Spacecraft reflector shape control
Authors: Bikeev E V , Matylenko M G , Shendalev D O , Vilkov Yu V , Sin’kovsky F K , Kolovskiy Y V , Kuklina A I
Published: January 2020

The paper considers a possible method of optimal controlling the mirror shape of a spacecraft (SC) large-sized reflector using the mechanisms affecting the reflector mirror shape in the course of its orbital operation. The authors give a theoretical justification for the applica-tion of the least squares problem and adapt the Gauss – Newton method used for solving it to the problem of the reflector mirror shape optimal control. Mathematical modeling confirmed the effectiveness of the method as applied to controlling the mirror shape of an umbrella type offset reflector with a diameter of more than 10 m, which includes a device for adjusting the reflector shape. The main issues of the method implementation are outlined in relation to the on-board system for monitoring the operational characteristics of a large-sized transformable antenna. The paper shows that the considered method can be used to control the operational characteristics of antennas with large-sized reflectors by affecting their geometric characteris-tics, namely, by bringing the reflector mirror shape to the desired profile. It is noted that in the context of meeting high requirements for the accuracy of the onboard antenna geometry, the use of the method will ensure the stability of the onboard antenna geometry and minimize the degradation of the antenna radio technical characteristics during orbital operation.
Research results of planetary roller screw transmission for high-precision mechanisms
Authors: Boyko S O , Golovenkin E N , Silivanov R P , Lekanov A V , Melkomukov A A
Published: January 2020

In the article experimental survey results of planetary roller screw drive for usage in high precision parallel structure mechanisms for space application are considered. The drive was developed in Academician M.F. Reshetnev Information Satellite System. Roller screw is perspective type of precision linear drives which excels in several characteristics extensively used in modern time ball screws. Ground tests conducting methodology, tests scheme of the developed roller screw are described. Key parameters of analyzed precision linear drive such as: transmission accuracy, repeatability, axial stiffness and operating lifetime are presented.
The development and reliability analysis environment of fault-tolerance multiversion software
Authors: Kovalev I V , Kovalev D I , Chefonov V S , Testoedvov N A , Koltyshev A A , Krivogornitsyn A G
Published: January 2020

The article considers the software toolkit «SA-Analysis» which is intended for designing and the analysis of fault tolerant software reliability. Fault tolerance is reached due to application multiversion software architecture. The description of software system toolkit is given. Application of similar system allows to raise efficiency of software engineering process and to create highly reliable software products.
Mathematical analysis of spacecraft control cyclograms
Authors: Testoedov N A , Kosenko V E , Golovenkin E N , Kuzovnikov A V , Kovalev I V
Published: January 2020

In this paper, the mathematical analysis of spacecraft control cyclograms is considered. The proposed solution is applied to a ground-based control complex of spacecrafts, where a plenty of cyclograms is a part of the general technological control cycles of spacecrafts, which include the whole of spacecrafts system life cycle. The problem of ground control system software optimization is solved using static strategies and cost criteria. Spacecraft control processes cover all the system control cycle and regulate an execution of the information processing and control tasks in the ground-based and board control complexes. Analyzing characteristics of such the processes has ascertained a strong relation between spacecraft technological control cycles and their computer-based realization for the mentioned complexes.
Implementation of multiversion software based on an object-oriented approach
Authors: Kovalev I V , Kovalev D I , Chefonov N S , Testoedvov N A , Golovenkin E N
Published: January 2020

The article discusses the concept of redundant programming and its implementation based on an object-oriented approach. Three components of multiversion programming, which are basic in the synthesis of fault-tolerant software, are identified. In comparison with the standard software life cycle, the basic procedures of the multiversion programming methodology are considered. The concept of abstract state of the multiversion software components version is based on the object-oriented approach.
Flexural fluctuations of the rotors of knife refiners
Authors: Vikharev S , Sannikov A , Zinatov M
Published: January 2020

The subject of the study is the flexural fluctuations of the rotors of knife refiners. The dynamic and mathematical models of rotors of disk mills are developed. As a result of research, a method for vibration calculation of rotors is proposed and tested. Research was also conducted using the Ansys software package. The error in determining the lower frequencies of free fluctuations of the mill rotors does not exceed 9%. Failure to take into account the elastic compliance of the rotor bearings leads to an error in determining the frequencies of free flexural fluctuations by no more than 15%, and the gyroscopic moment increases the above frequencies by no more than 25%. The cantilever arrangement of the disk reduces the frequencies of free fluctuations of the mill rotor by 1.1 - 1.4 times in comparison with the inter-support arrangement. The developed calculation procedure can be used in other industries, for example, mining and metallurgy.
Potential for development of innovative processes in the high-tech sector of the region’s economy
Authors: Vasilyeva Z A , Lihacheva T P , Moskvina A V , Borodkina V V
Published: January 2020

The development prospects of innovative processes in the economy of the region, characterized by technological diversity and diversified specialization, are considered. The development areas were prioritized on the basis of the need to develop high-tech and knowledge-intensive sectors of the economy, which are the locomotives of growth for basic and infrastructural ones. Assessment of strategic opportunities was based on an analysis of the development trends of world commodity markets, taking into account the potential of the region and the competitive positions of industries. The development of world markets was considered in the aspect of “global challenges” and national trends in two types of challenges, which determined the possibilities for their development and impact on national and local markets. At the same time, the emergence of new conditions for the development of commodity markets, which must be taken into account in the evaluation processes. The phasing of the study is determined. The prospects for the development of a high-tech sector of the economy in the field of high production redistribution in the context of traditional and new markets are presented. A positioning map has been compiled and the transition from local (niche) competitiveness to international. Potential elements of the region’s scientific and technical system in the form of R&D, production and consumption centers that accompany the process of technological development along the entire life cycle are identified.
Products of the Industry 4.0 competence centers
Authors: Zakoldaev D A , Gurjanov A V , Shukalov A V , Zharinov I O
Published: January 2020

Branch competence centers are organization and jurisdiction forms of company activity to unite digital, smart and virtual factories of the Industry 4.0 according to its specialty. Branch competence centers are for huge infrastructure projects solution where the result is not only the item itself (high-tech product) but also professional cadres, new types of technologies, new forms of the production data representation and other. There is the Industry 4.0 products classification and also specializations of the branch competence centers which are meant to be implemented into the industry by the first hand. Actual for the Industry 4.0 competence centers in digital projection are digital production competence centers, item exploitation accompanying competence centers and standardizing and certification competence centers of products and technologies. There are schemes of the digital companies interaction and the most probable branch competence centers in the item designing industry results are defined.
Justification of well drilling modes using collapsible drilling tools with multi-row cutting structure
Authors: Bovin K A , Shigin A O , Plotnikov I S , Nafikov R Z , Miranov A I
Published: January 2020

Rational drilling modes for blast holes in open pit mining depend on the physical and mechanical properties of the rocks. Serially manufactured drilling tools often work in areas that do not meet the conditions of their application (especially in coal mines). The paper presents the design of a cutting bit of a cutting-rotational type with hard-alloy multi-row cutting structure, as well as the dependence of the power regimes of drilling with this bit on the of drill rocks strength.