bluuebunny/crossref_metadata_2025 huggingface dataset:
The moral work of becoming a professional
Authors: Nissi Riikka , Pässilä Anne
Published: January 2021

In contemporary working life, art-based initiatives are increasingly used in organizational training and
development. For artists, this has created new employment opportunities as creative entrepreneurs who provide specialist services
for workplaces. In this article, we study the dynamics of such encounters through the narrated accounts of training professionals.
Our data come from a professional mentoring program where the working pairs of artists and consultants shared stories about their
customer projects. By using conversation analysis as a method, we analyze the way stories are interactionally accomplished in peer
group sessions of the program. In particular, we analyze how participants produce different versions of the narrated events, and
by so doing, negotiate the questions of blame and accountability with regard to professional action. In conclusion, we discuss
stories and storytelling as organizational practice through which the moral order and legitimacy of the program is sustained and
the boundaries of the profession constructed.
Effects of different goal orientations and virtual opponents performance level on pacing strategy and performance in cycling time trials
Authors: Crivoi do Carmo Everton , Renfree Andrew , Nishimura Vieira Caio Yudi , Ferreira Diego dos Santos , Truffi Gabriel Abrahão , Barroso Renato
Published: January 2021

We investigated the effects of different performance goals (best time vs. beat the opponent) on pacing behaviour during a 10‐km cycling race and explored the influence of different performance level of opponents on ratings of perceived exertion (RPE), affective feelings and self‐efficacy. Thirteen cyclists performed two time‐trials (TT) and two races against a faster (FAST +6%) or a slower (SLOW –3%) virtual opponent. Power output (PO), RPE, affective feelings and self‐efficacy were recorded at each kilometre point. Race average and race phases [starting (P1 = first kilometre); first half (P2 = 2nd–5th kilometre); second half (P3 = 6th–9th kilometre) and final sprint (FS = last kilometre)] were analysed. There was no difference in performance, assessed by race time between conditions (p = .84). PO during TT was lower in P3 compared to FS (p = .03; ES 0.6; 90%CI 0.4–0.7). In SLOW and FAST, PO was higher in P1 compared to other phases (p < .05). PO in FS was higher in TT compared to FAST (p = .01; ES −0.97; 90%IC −1.4 to −0.5). RPE increased and affective feelings decreased during all conditions. Self‐efficacy was stable through TT and SLOW, but decreased during FAST with higher values in P1 compared to P2 (p = .01; ES −1.1; 90%IC −1.6 to −0.6), P3 (p < .001; ES −2.2; 90%IC −2.8 to −1.6) and FS (p < .001; ES −2.6; 90%IC −3.3 to −1.8). Pacing behaviour, specifically starting and final sprint, was affected by virtual opponents independent of performance level, demonstrating the importance of goal orientation.

Highlights

Adjustments in exercise intensity result from a complex decision‐making process involving physiological, psychological, environmental and tactical information.

Goal pursuit is an important determinant of pacing behaviour since athletes must balance their efforts with expectations of success.

A competitive environment may be included to motivate participants to maintain their effort and at the same time to improve their self‐confidence.

The presence of a final sprint seems to be related to the goal orientation and perceived outcomes of success or failure.
Think globally, act locally: Centrosome-localized mRNAs ensure mitotic fidelity
Authors: Zarnescu Daniela C.
Published: January 2021

The functional importance of mRNA localization to centrosomes is unclear. Ryder et al. (2020. J. Cell Biol. https://doi.org/10.1083/jcb.202004101) identify fragile-X mental retardation protein as a regulator of centrocortin (cen) mRNA dynamics in Drosophila. Mistargeting of cen impairs division and development, indicating that cen mRNA localization to centrosomes ensures mitotic fidelity.
Phenanthrene impacts zebrafish cardiomyocyte excitability by inhibiting IKr and shortening action potential duration
Authors: Kompella Shiva N. , Brette Fabien , Hancox Jules C. , Shiels Holly A.
Published: January 2021

Air pollution is an environmental hazard that is associated with cardiovascular dysfunction. Phenanthrene is a three-ringed polyaromatic hydrocarbon that is a significant component of air pollution and crude oil and has been shown to cause cardiac dysfunction in marine fishes. We investigated the cardiotoxic effects of phenanthrene in zebrafish (Danio rerio), an animal model relevant to human cardiac electrophysiology, using whole-cell patch-clamp of ventricular cardiomyocytes. First, we show that phenanthrene significantly shortened action potential duration without altering resting membrane potential or upstroke velocity (dV/dt). L-type Ca2+ current was significantly decreased by phenanthrene, consistent with the decrease in action potential duration. Phenanthrene blocked the hERG orthologue (zfERG) native current, IKr, and accelerated IKr deactivation kinetics in a dose-dependent manner. Furthermore, we show that phenanthrene significantly inhibits the protective IKr current envelope, elicited by a paired ventricular AP-like command waveform protocol. Phenanthrene had no effect on other IK. These findings demonstrate that exposure to phenanthrene shortens action potential duration, which may reduce refractoriness and increase susceptibility to certain arrhythmia triggers, such as premature ventricular contractions. These data also reveal a previously unrecognized mechanism of polyaromatic hydrocarbon cardiotoxicity on zfERG by accelerating deactivation and decreasing IKr protective current.
Survey of texture zeros with light Dirac neutrinos
Authors: Borgohain Happy , Borah Debasish
Published: January 2021

We classify all possible texture zeros in a light neutrino mass matrix in a diagonal charged lepton basis by considering the Dirac nature of light neutrinos. For the Hermitian nature of neutrino mass matrix, the number of possible texture zeros remain the same as Majorana texture zeros, but with less free parameters due to the absence of additional Majorana CP phases. Relaxing the Hermitian nature of the neutrino mass matrix leads to many more possibilities and freedom due to additional CP phases, mixing angles not constrained by neutrino data. While we find only a very few of the one-zero and two-zero textures in the Hermitian case to be allowed, in the non-Hermitian case some textures even with four zeros are allowed. While most of the one-zero, two-zero and three-zero textures in this case are allowed, four-zero textures are tightly constrained with only six allowed out of 126 possibilities. The allowed textures also give interesting correlations between light neutrino parameters with sharp distinctions between normal and inverted mass ordering. Many of these allowed textures also saturate the Planck 2018 upper bound on the sum of absolute neutrino masses.
Mechanical properties and deformation behavior of the magnesium crystal with nano-cracks
Authors: Li Nan , Ding Ning , Zhou Jixue , Liu Long , Zaïri Fahmi , Yang Yuansheng
Published: January 2021

Understanding how intrinsic defects impact magnesium (Mg) crystals mechanics is of prime importance for engineering applications. In this work, the mechanical performance of Mg crystals with cracks at the nanoscale was studied using molecular dynamics method. Influence of the nano-crack type and size on the deformation behavior of Mg crystals was analyzed in details. The obtained results show that the mechanical properties of Mg crystals decrease with the increase of the nano-crack length (perpendicular to the tensile direction). However, the yield stress of Mg crystals is enhanced by increasing the nano-crack width (parallel to the tensile direction) while the nano-crack length remains unchanged. The effect of temperature on Young’s modulus of Mg crystals is weak along z-axis, while Young’s modulus along y-axis is clearly temperature-dependent. The yield stress of Mg crystals decreases with increasing temperature. The appearance of twins is the main deformation mechanism in Mg crystal along z-axis while the deformation begins with the formation of a prismatic slip along y-axis. The results obtained in this work would provide useful information for further mechanical properties regulation of Mg crystals.
A transient process observation method based on the non-homogeneous Poisson process model *
Authors: Zhao Kuo , Ouyang Xiao-Ping , Guo Hui-Ping , Chen Liang , Zhou Lei-Dang , Ruan Jin-Lu , Wang Han , Lv Ning , Gao Run-Long
Published: January 2021

The current-mode-counting method is a new approach to observing transient processes, especially in transient nuclear fusion, based on the non-homogeneous Poisson process (NHPP) model. In this paper, a new measurement process model of the pulsed radiation field produced by transient nuclear fusion is built based on the NHPP. A simulated measurement is performed using the model, and the current signal from the detector is obtained by simulation based on Poisson process thinning. The neutron time spectrum is reconstructed and is in good agreement with the theoretical value, with its maximum error of a characteristic parameter less than 2.3%. Verification experiments were carried out on a CPNG-6 device at the China Institute of Atomic Energy, with a detection system with a nanosecond response time. The experimental charge amplitude spectra are in good agreement with those obtained by the traditional counting mode, and the characteristic parameters of the time spectrum are in good agreement with the theoretical values. This shows that the current-mode-counting method is effective for the observation of transient nuclear fusion processes.
Improving reliability and efficiency of hydraulic turbines
Authors: Gusak O , Cherkashenko M , Potetenko O , Gasiyk A , Rezvaya K
Published: January 2021

The article deals with new design solutions to improve the operating process based on new design solutions and effectively use hydraulic turbines for heads up to 800-1000 m, expand the operating range relative to flow rates and heads with high energy and cavitation indicators and reliability of operation on varying modes that differ from the optimum operating mode.

On the basis of complex experimental studies of the flow pattern in a water passage and, first of all, in the hydraulic turbine inlet for heads of 400-500 m, this article reveals the causes of increased energy losses. The energy losses are caused by large vortexes occurring in the spiral casing; they distort the flow directed to the runner of the hydraulic turbine. Several ways for improving the operating process are proposed, including new design solutions.

The issues of improving the operating process of various types of hydraulic turbines are discussed. This is done by creating an angular momentum upstream the runner blades, which is necessary for optimum operation of the hydraulic turbine due to flow inlet using nozzle vanes located around of the runner inlet. The advantages of new types of hydraulic turbines and a more advanced operating process are illustrated by the hill diagram of this turbine.
New flowing system in cooling system axial-flow pump in a hard coal electric power plant
Authors: Peczkis G , Synowiec T , Zahorulko A
Published: January 2021

This article presents the new construction of a centrifugal impeller pump which supplies the cooling system in coal power plants. The article also shows the history of producing this kind if pumps for unified 125 MW and 200 MW power units which dominate in Poland. The process of numerical analysis and conventional calculations leading to the improvement of qualities of the flowing system exceeding literature indicators are presented. The article shows the problems which appeared during assembling the pump in its target workplace. The results of the measurements of the pump flowing system in its target workplace are presented.
Effect of gas content in the pumped liquid on the characteristics of a torque flow pump
Authors: Sapozhnikov S , Antonenko S , Miltykh V , Moskalenko V , Mandryka A
Published: January 2021

The article considers one of the ways to increase the ability of a dynamic pump to pump gas-liquid mixtures - the application of the vortex principle of energy transfer. This scheme is embodied in a torque flow pump, which is able to pump mixtures with a gas content of up to 0,40 - 0,45 without additional devices for preparing the mixture. Experimental researches the influence the value of the volumetric gas content on the performance characteristics of the torque flow pump of the "Turo" type are given. The analysis of influence of structure of a stream of gas-liquid mixture on the value of the critical gas content in the interblade channels of the impeller is represented and developed a physical model of decrease the parameters of the torque flow pump.
Combined operating process of torque flow pump
Authors: Panchenko V , German V , Kondus V , Ivchenko O , Ryasnaya O
Published: January 2021

Due to a simple design and hydraulic passage that is the least susceptible to clogging, torque flow pumps (TFP) of Turo type are the most common pumps used for pumping various hydraulic mixtures. These pumps are referred to vortex pumps, operation of which is accompanied by energy loss and vortex formation resulting in low economic efficiency. Since the TFP is a vortex hydraulic machine, the ratio of the fluid velocity in the free pump passage to the impeller rotational speed ωfluid
/ω is an indicator of the TFP efficiency. The higher the value of ωfluid
, the more efficient the pump is. The mechanism of the energy transfer in the TFP is caused by both blade and vortex operating process, or a combined operating process. The efficiency of the pump can be improved by increasing the portion of blade operating process. The aim of the study is to improve the efficiency of the TFP of Turo type by modifying the impeller design, to obtain a basic equation of the TFP with a new impeller which has several extended blades, and to study the influence of the impeller geometry on the pump performance experimentally. The study was carried out by analytical and experimental methods. The equation describing the head dependence on the hydraulic passage dimensions of the pump with a new impeller was obtained analytically. This equation can be used to clarify the methodological recommendations for designing the pump. The energy balance in the TFP was analyzed. During the testing on a test rig, the characteristics of the pump were obtained, which confirmed the advantages of using the modified impeller with extended blades resulting in increase of the portion of the blade operating process.
Experimental and numerical analysis of the rail with the heat control valves
Authors: Romanik G , Rogula J , Machalski A
Published: January 2021

The article presents the results of experimental and numerical tests of a surface heating flow control system consisting of a distribution rail along with the fixed valves set. The flow rates of single and parallel installed valves were measured, their three-dimensional models were prepared and used to make a flow models. The coefficient of kv is computed for a single valve on the rail and for the set of valves. In a flow model geometry the measurements of the test stand elements were considered in order to compare the results. The influence of the addition of the valves to the rail on the flow rate distribution was determined.
Increasing of durability of mechanical seals of oil and gas centrifugal pumps using tungsten-free cermet with Cu-Ni-Mn binder
Authors: Shihab T A , Shlapak L S , Namer N S , Prysyazhnyuk P M , Ivanov O O , Burda M J
Published: January 2021

The rational materials selection for friction pairs is an important prerequisite in promoting of reliable operation of mechanical seals used in centrifugal pumps. The experience of mechanical seals exploitation shows that most preferable is combination of “hard” and “soft” materials. As “hard” materials ceramics based on SiC, Al2O3, Si3N4, are the most commonly employed and for “soft” materials metal alloys, composites and carbon materials are widely used. In this study chromium carbide based composite metal-ceramic material with copper-nickel-manganese binder was developed for using in mechanical seals rings friction couples with silicon carbide (SiC) ring. Metal-ceramic sealing rings were manufactured by infiltration of pre-sintered porous chromium carbide skeletons with Cu60-Ni20-Mn20 melt at 1150 °C in protective (argon) atmosphere. Results of experimental investigations and theoretical modelling of heat transfer during friction, show significant advantages of proposed materials combination over ceramic-ceramic pairs through its better tribological characteristics and resistance to thermal shock. Industrial testing allows us to conclude that using of mechanical seal rings of proposed materials combination almost completely prevents failures of sealing rings surfaces caused by thermal cracking.
The adaptive benefits of agricultural water markets in California
Authors: Arellano-Gonzalez Jesus , AghaKouchak Amir , Levy Morgan C , Qin Yue , Burney Jennifer , Davis Steven J , Moore Frances C
Published: January 2021

Climate change is expected to increase the scarcity and variability of fresh water supplies in some regions with important implications for irrigated agriculture. By allowing for increased flexibility in response to scarcity and by incentivizing the allocation of water to higher value use, markets can play an important role in limiting the economic losses associated with droughts. Using data on water demand, the seniority of water rights, county agricultural reports, high-resolution data on cropping patterns, and agronomic estimates of crop water requirements, we estimate the benefits of market-based allocations of surface water for California’s Central Valley. Specifically, we estimate the value of irrigation water and compare the agricultural costs of water shortages under the existing legal framework and under an alternate system that allows for trading of water. We find that a more efficient allocation of curtailments could reduce the costs of water shortages by as much as $362 million dollars per year or 4.4% of the net agricultural revenue in California in expectation, implying that institutional and market reform may offer important opportunities for adaptation.
Correlated disorder in the SYK2 model
Authors: Chris Lau Pak Hang , Ma Chen-Te , Murugan Jeff , Tezuka Masaki
Published: January 2021

We study the SYK2 model of N Majorana fermions with random quadratic interactions through a detailed spectral analysis and by coupling the model to two- and four-point sources. In particular, we define the generalized spectral form factor (SFF) and level spacing distribution function by generalizing from the partition function to the generating function. For N = 2, we obtain an exact solution of the generalized SFF. It exhibits qualitatively similar behavior to the higher N case with a source term. The exact solution helps understand the behavior of the generalized SFF. We calculate the generalized level spacing distribution function and the mean value of the adjacent gap ratio defined by the generating function. For the SYK2 model with a four-point source term, we find a Gaussian unitary ensemble behavior in the near-integrable region of the theory, which indicates a transition to chaos. This behavior is confirmed by the connected part of the generalized SFF with an unfolded spectrum. The departure from this Gaussian random matrix behavior as the relative strength of the source term is increased is consistent with the observation that the four-point source term alone, without the SYK2 couplings turned on, exhibits an integrable spectrum from the SFF and level spacing distribution function in the large N limit.
Monitoring of endogenous nitric oxide exhaled by pig lungs during ex-vivo lung perfusion
Authors: Chollier Thibaut , Richard Lucile , Romanini Daniele , Brouta Angélique , Martin Jean-Luc , Moro Cécile , Briot Raphaël , Ventrillard Irène
Published: January 2021

In the context of organ shortage for transplantation, new criteria for better organ evaluation should be investigated. Ex-vivo lung perfusion (EVLP) allows extra-corporal lung re-conditioning and evaluation, under controlled parameters of the organ reperfusion and mechanical ventilation. This work reports on the interest of exhaled gas analysis during the EVLP procedure. After a 1 h cold ischemia, the endogenous gas production by an isolated lung of nitric oxide and carbon monoxide is simultaneously monitored in real time. The exhaled gas is analysed with two very sensitive and selective laser spectrometers developed upon the technique of optical-feedback cavity-enhanced absorption spectroscopy. Exhaled gas concentration measured for an ex-vivo lung is compared to the corresponding production by the whole living pig, measured before euthanasia. On-line measurements of the fraction of nitric oxide in exhaled gas (FENO) in isolated lungs are reported here for the first time, allowing to resolve the respiratory cycles. In this study, performed on 9 animals, FENO by isolated lungs range from 3.3 to 10.6 ppb with a median value of 4.4 ppb. Pairing ex-vivo lung and pig measurements allows to demonstrate a systematic increase of FENO in the ex-vivo lung as compared to the living animal, by a factor of 3 ± 1.2. Measurements of the fraction of carbon monoxide in exhaled gas (FECO) confirm levels recorded during previous studies driven to evaluate FECO as a potential marker of ischemia reperfusion injuries. FECO production by ex-vivo lungs ranges from 0.31 to 2.3 ppm with a median value of 0.8 ppm. As expected, these FECO values are lower than the production by the corresponding whole pig body, by a factor of 6.9 ± 2.7.
Effect of iron nanopowder on flammability of epoxy composites
Authors: Nazarenko O B , Lipchansky D S , Smirnova I N
Published: January 2021

Reducing the flammability of polymeric materials is a serious problem that needs to be solved. The paper presents the results of a study of the effect of iron nanopowders, used as filler, on the flammability of epoxy polymers. Epoxy composites filled with 5 wt. % of iron nanopowder and 10 wt. % of boric acid separately, as well as in combination were prepared. The flammability of the prepared samples was evaluated by determining the ignition temperature and time-to-ignition.
Effect of local power systems integration on the distribution network functions
Authors: Byk F L , Myshkina L S , Frolova Ya A
Published: January 2021

The Russian energy industry today needs an “energy transition”. The key link is the Regional Electric Network Companies as the basis of regional power supply system. There are significant changes in the industry, such as changes in legislation, the emergence of new requirements, changes in the regional fuel landscape. The mass appearance of distributed generation as the basis of local power systems has a great influence on the changes. This has led to new functions for Regional Electric Network Companies. The paper studies the effect of local power systems integration on the expansion of the functions performed by distribution network. Particular attention is paid to demand management for electricity; mutual reservation, multi-agent voltage regulation, functions of local energy systems integration with distribution networks.
Powerflow calculations in powersystems considering traction load
Authors: Shestakova V V , Kats I M , Darkhanova A V
Published: January 2021

Nowadays, the negative impact of traction load on power system operation poses a serious problem that may lead to false tripping or even failures of relay protection devices and reduce the quality of electrical energy. This situation is typical for the Zabaikal power system, in which in some areas the share of electricity consumption by railway reaches 70% of total consumption. A computing tool, that would allow simultaneous analysis of the modes, both in the utility’s grid and in the traction network, do not exist. The inability to carry out such analysis often leads to inconsistency in the actions of control centers and railway transport authorities, especially when maintenance planning. Mathematic modeling in such software systems as “Mustang”, “RastrWin3”, “MathCAD”, “Matlab/Simulink”, “PSCAD”, “Kortes”. The developed model represents Zabaikal power system and contain detailed railway between substation Razmahnino – Shilka, Chita – Mogocha. Negative-sequence voltage unbalance factors were calculated for the case of train movement between substation Razmahnino and substation Shilka. Also, the necessity of back-up relays tripping values correction is stated. It was shown that for the powerflow calculations taking into account the traction load, it is rational to use a complex mathematical model, which uses compatible software systems with the ability of quick and easy data exchange.
The development of post-processing algorithm for the ultrasonic evaluation by the application of automated robotic testing systems
Authors: Dolmatov D , Zhvyrblya V , Sednev D
Published: January 2021

The implementation of automated testing systems based on six degrees of freedom (DOF) robotic manipulators is the actual trend in ultrasonic testing equipment development. Such systems are able to provide fast ultrasonic evaluation with the respect of the surface of the testing object. In this work, the post-processing algorithm based on Synthetic Aperture Focusing Technique (SAFT) is suggested. Such algorithm allows presenting the results in the form of high-resolution imagery of the internal structure of testing objects. The suggested algorithm is applicable in the case of the utilization of automated testing systems based on six DOF robotic manipulators and takes into account all the features conditioned by such equipment application. Performance of the suggested algorithm was tested experimentally.
Heating index for combined-cycle
Authors: Shchinnikov P A , Borush O V , Voronkova A S , Belyavskaya P V
Published: January 2021

The technique of the analysis of combined-cycle power plants with binarity coefficient which is less than one is offered. The technique enters a heating indicator. The index characterizes warmth anneafling by combined-cycle power plant. Plant is equipped with the steam turbine with heating selection of steam. Plants with afterburning and dual-fuel plants are considered. Interference of again entered index, degrees of binarity, various efficiencies is at each other shown in this article. The heat balance diagrams and the power streams’s integrated charts of combined-cycle plants on the basis of the gas-turbine unit V64.3 are submitted. The calculated quantitative values of an efficiency on power generation on thermal consumption, coefficient of binarity, a heating index, the relative annealing of warmth and other characteristics for some of the actual or being in a stage of the project combined-cycle plants are given.
Emission properties of YAG: Ce ceramics with barium fluoride flux
Authors: Stepanov S A , Valiev D T , Vaganov V A , Shrayber A M , Paygin V D
Published: January 2021

In this work, we investigated the luminescent properties of YAG, Ce ceramics with an addition of barium fluoride flux. The ceramic samples were sintered from obtained YAG: Ce, BaF2 phosphor powder. Morphological, luminescent and decay time characteristics of YAG: Ce ceramics were investigated. The luminescence decay kinetics analysis of the ceramics showed that the decay time in phosphors and ceramics is different in the visual spectral range.
Remote Reconfiguration for hardware-accelerated integrated Circuits
Authors: Nagler M , Kotre G G , Hardt W
Published: January 2021

When it comes to hardware-accelerated solutions, Field Programmable Gate Arrays (FPGA) are often used to have a good trade-off between performance and the conservative cost restrictions the systems FPGAs are used in commonly have. With reconfiguration or partial reconfiguration the amount of needed resources can be reduced. In this work we show a solution to change the functionality of the system remotely. This means no physical connection is required. The different configurations can either be stored on the board in advance or can be sent to it just in time.
Parallel solution of 3D forward and inverse problems of airborne electromagnetic survey
Authors: Persova M G , Soloveichik Y G , Vagin D V , Kiselev D S , Trubacheva O S , Kondratyeva N S
Published: January 2021

The paper is devoted to the comparison of different approaches to parallel solution of 3D forward and inverse problems of airborne electromagnetic (EM) surveys when multidimensional processing of data obtained on large areas is needed. The mathematical models for the solution of 3D forward and inverse problems and different methods of their parallelization are considered. The results of numerical experiments for the airborne EM survey problem, which is typical of prospecting the kimberlite bodies in Eastern Siberia, are presented. It is shown that the combination of different techniques of parallelization in a distributed computational system, taking into account the specifics of the numerical schemes implementation for forward and inverse problems solution, makes it possible to achieve the speedup close to linear.
Analysis of the opportunities for improving energy efficiency in public buildings
Authors: Terziev A , Stoyak V , Ushakov V , Brazhanova D , Suleimanov S
Published: January 2021

Reducing energy consumption and maintaining an appropriate indoor air quality in buildings is a global trend. This is achieved in several ways – improving the building envelope thermal characteristics; fuel base replacement; introduction of smart energy consumption tracking systems. The aim of this paper is an analysis of the impact of energy efficiency measures introduced in buildings that provide health services. Measures have been taken to improve the energy performance of the envelope, as well as to modernize the system for the production and distribution of thermal energy. One complete year after energy savings measures implemented the total energy savings of 37.9% have been achieved. Further economic assessment has been made regarding the profitability of the applied measures.
The Joule–Thomson effect and the non-equilibrium thermodynamics of sliding nano-contact
Authors: Deeva V S , Slobodyan S M
Published: January 2021

Dynamical systems, having the space-time-varying behavior, takes place in the range of processes. Especially interesting are those which affect the structure and properties complex materials during its formation because of thermal communication between the different parts of the system. One of the most important features of the study is the temperature behavior in the contact area under sliding interaction. This behavior results from the large contribution of the heat capacity to the entropy. We investigate the influence of the Joule-Thomson effect on the behavior and thermal characteristics of contact area formed by debris and lubricant between the sliding surfaces when they are brought into contact with one another in commutator-and-brush assembly as an example. The model reflecting the influence of the change in the third body temperature on the material properties, geometry of the debris and the surrounding environment is proposed. The result shows the strong correlations between Joule-Thomson effect and mechanical fluctuations of the wear particles that are responsible for the size of the contact area.
Influence of modified natural zeolite on the thermal stability of epoxy based composites
Authors: Murashkina Y S , Martemyanov D V , Nazarenko O B
Published: January 2021

The effect of modified natural zeolite of the Shivyrtuysky deposits on the thermal behavior of epoxy composites at the heating was studied. The modification of the zeolite particles with aluminum oxyhydroxide (AlOOH) nanofibers was made. AlOOH nanofibers were obtained at the heating and oxidation of aluminum powder by water. The parameters of thermal-oxidative and thermal destruction of the samples with a filler concentration of 1, 2, 5, and 10 wt. % were determined. The limiting oxygen index was determined by the calculation method.
Permanent magnet synchronous motor sensorless control based on rotor flux observer with low-pass filter adaptation
Authors: Bevz D V , Zavyalov V M
Published: January 2021

This paper presents a strategy for a permanent magnet synchronous motor sensorless vector control based on rotor flux estimation considering a rotor saliency. The integration problem in the stator flux estimation was solved by replacing the integrator with a low-pass filter. The low-pass filter parametric adaptation algorithm with phase delay compensation, based on Bode diagrams was designed for the rotor angular position estimation accuracy improving. The proposed adaption algorithm allowed to expand a stable motor control with a high accuracy in the rotor position estimation down to 15 rpm. Also the developed rotor angular position estimation algorithm together with adaptive field weakening algorithm provides a sable motor operation with a high accuracy in the rotor position estimation at the high speed.
Quantized lobe level theoretical estimates for phased array antennas applicability
Authors: Slobodyanenko A A , Edvabnik V G , Shebalkova L V
Published: January 2021

This paper raises the question of the applicability of some theoretical estimates of the quantization lobe level. Existing assessment methods and their features are considered. Based on numerical simulated method, statistical characteristics are constructed for the magnitude of the level of quantization lobes and, according to the proposed criterion, a conclusion is given on the consistency of theoretical estimates.
Scientific-technical developments that ensure the growth of the resource potential of the regional oil and gas complex
Authors: Novikova A S , Eremenko O V , Gancharov S A
Published: January 2021

The Orenburg oil and gas complex is one of the key participants in the Russian fuel-energy sector of economy. However, the Orenburg fields have moved to the final stage of operation. In this regard, the authors in article attempt to formulate and justify scientific-technical developments that allow to stabilize gas production and increase the resource potential through: the introduction of innovative geological-technical measures; the use of «CO2-technologies»; modernization of the gas collection and primary treatment system; changes in the technology of oil and condensate production; creating tools for the intellectualization of subsurface use, etc. The authors assessed the prospects of new technologies in terms of achieving sustainable gas production in the next 10 years in the amount of 10 billion m3. For all the proposed innovations, a positive economic effect was obtained, however, some of them did not affect the increase in the coefficient of hydrocarbon recovery from the reservoir, ensuring only the maintenance of the volume of raw material production at the field. The total increase in production over the calculation period will amount to 33.4 billion m3 of gas and over 0.9 million tons of stable condensate.
Road pavement crack detection using deep learning with synthetic data
Authors: Kanaeva I A , Ivanova Ju A
Published: January 2021

The improvement of road system quality is a critical task. The mechanism to address such important issue is close monitoring of road pavement condition. Traditional approach requires manual identification of damages. Taking into account considerable length of road system it is essential to create an effective automatic pavement defects detection tool. This approach will extremely reduce time for monitoring of current road state. In this paper global experience in solution of detection issues of road pavement’s distress is reviewed. The article includes information about the existing datasets of road defects, which are commonly used for detection and segmentation. The present work is based on deep learning approach with the use of synthetic generated training data for segmentation of cracks in driver-view image. The novelty of the approach lies in creating synthetic dataset for training state-of-the-art deep learning frameworks. The relevance of the research is emphasized by processing of wide-view images in which heterogeneous pixel intensity, complex crack topology, different illumination condition and complexity of background make the task challenging.
Time indicators of effective optimization algorithms in group load control modelling
Authors: Dimitriev A P , Bazhenov R I
Published: January 2021

The purpose of the work is to determine the optimal set of parameters of the genetic algorithm for optimization in the control model of the group load of electricity consumers taking into account time parameters. The analysis based on the approximation of empirical results is used as a research method. The results of two efficient algorithms used for optimization in this model are compared. Computational experiments were carried out and their results were processed, the location of efficiency of the parameters of the combined genetic algorithm was determined.
The dependence between the ignition value of air suspension and the size of the reaction chamber
Authors: Sechin A I , Sechin A A , Patrakov Yu F , Mezenceva I L , Amelkovich Yu A
Published: January 2021

The influence of the geometric factor of the reaction chamber on the limit value of the air suspension ignition is studied. It is found that in determining the lower concentration limit of the flame propagation (LCLFP), it is most promising to use an installation with a cylindrical reaction chamber whose height is equal to the diameter. The dependence of the determination of the LCLFP value on the geometric factor of the reaction chamber is proposed, tested on metal powders and organic dust-forming materials. The expression allowing to carry out the comparative analysis of scientific results received on other technical devices with the results received on the installations executed according to the requirements of normative and technical documentation is received that significantly reduces the volume of experimental works.
Modification of ANFO detonation parameters by biowaste addition
Authors: Uranchimeg E , Narantsetseg M , Purev L
Published: January 2021

The present study relates to modification of ammonium nitrate fuel oil mixture. For many years, ammonium nitrate fuel oil has been one of the most popular explosives for use in mining operations. Therefore, it is manufactured and used widely in large volume. Although ammonium nitrate is a relatively strong oxidation agent, it is insufficient to detonate by itself. Therefore, it is generally admixed with liquid fuel such as diesel and various modifiers. Trinitrotoluene (TNT) and metal aluminium are typically used as additive. This paper studies ammonium nitrate fuel oil (ANFO) composition modified by biowaste dung as additive to generate efficient explosion and to result low cost blasting.

The experiment results of modified ANFO with biowaste dung as additive illustrate that physical stability and absorption increased by 5% percent compared to regular ANFO. Also was revealed that average detonation brisance increased from 20.5 to 27.5 mm and detonation speed increased from 2300 to 3800 m/s compared to regular ANFO. This modified ANFO is lowered blasting cost from 50 to 150 tugriks per 1kg ANFO compared to aluminium and TNT additives.
The mechanoenzymatic method for enhancing the biological value of condensed cream soups
Authors: Bychkova E , Pogorova V , Gosman D , Dome K
Published: January 2021

Condensed creamy pea soups of high biological value have been developed. A stage comprising enzymatic hydrolysis in combination with mechanochemical treatment of raw material was proposed as a method to increase the content of free amino acid and short peptides in the finished product. Evaluation of physicochemical quality parameters demonstrated that the samples had high nutritional and biological value.
Measurement of electron beam transverse flux density distribution
Authors: Bulavskaya A A , Cherepennikov Yu M , Chakhlov S V , Grigorieva A A , Miloichikova I A , Vukolov A V , Stuchebrov S G
Published: January 2021

The work presents experimental measurements of electron beam transverse flux density distribution. Experimental data is recorded during the multiple beam scanning in different directions with the particular angle step by the thin scintillation strip. The intensity of the light generated in the scintillator is proportional to the intensity of the radiation going through the strip. Generated photons is guided by the optical fiber to the photomultiplier and registered by the analyzer. The result of the work is the experimental data demonstrated dependence of the radiation intensity on detecting strip position and angle orientation. This dependence is transformed to the radiation intensity dependence on the coordinates in the beam transverse plane using special mathematical processing.
Computing unite of a mobile computer vision system
Authors: Zoev I V , Markov N G , Yagunov T A
Published: January 2021

The work is devoted to the computing unite of a mobile computer vision system and developing his algorithmic software. We developed hardware-implemented the convolutional neural networks on a field programmable gate array. A study of the performance and power consumption of variants of the computing unite.
Registration and processing system of digital speckle images
Authors: Korotina E A , Gubarev F A , Gandzha T V , Liushnevskaya I D
Published: January 2021

In this paper, we discuss an application of the method of laser-speckle correlation for studying the blood coagulation process. A module for recording and processing speckle images based on a debugging kit for the Atxmega128A1 microcontroller has been developed. The results of testing the developed module as part of a laboratory setup based on a semiconductor laser using standard reagents are presented.
Feasibility demonstration of back-to-back method for induction traction motors testing
Authors: Beyerleyn E V , Tyuteva P V , Dorzieva B S
Published: January 2021

The authors present the feasibility demonstration of energy-saving back-to-back test method implementation for induction traction motors testing. The results of theoretical and physical modeling that support the energy effectiveness and usefulness of the proposed back-to-back method are presented in the article. The effectivity ratio of the test circuit has been calculated due to confirm the energy effectiveness and feasibility of the proposed method, and also authors identified a number of advantages of the back-to-back method for high power induction traction motors.
The efficiency of combined electrothermal and electrochemical accumulation of electricity of a photovoltaic power plant
Authors: Lukutin B V , Muravyev D I , Ryzhkova A V
Published: January 2021

The relevance of the research is caused by the fact that renewable energy, in particular, photovoltaic generation is becoming essential support in the decentralized systems in Russia. However, the high cost of the power equipment of photovoltaic power plants is a deterrent to their wide practical application. This paper presents the method for reducing the cost of photovoltaic power plants by optimizing energy conversion processes in isolated power supply systems. The characteristics of equipment for photovoltaic generation and the subsequent conversion of parameters and power storage is an urgent task are presented.
Method of multispectral image fusion using wavelet spectra
Authors: Borisova I , Legkiy V
Published: January 2021

The method of image fusion for images of the same scene obtained in different spectral ranges with the formation of an integrated monochrome image is considered. The fusion method is based on the wavelet decomposition of the original images. A strategy for fusing detail coefficients by comparing the proportions of their magnitudes for all original images is proposed. The fusion procedure does not require any thresholds. The algorithm does not introduce additional distortions and collects all the necessary information from the original images. The proposed algorithm can be used in optoelectronic systems for automatic image processing.
Perspective direction of shaped charges perfecting
Authors: Grif E M , Guskov A V , Milevskij K E
Published: January 2021

The paper analyzes the achievements of modern research in the area of increasing the penetration diameter in the operation of shaped charges. The functioning of cumulative charges with various forms of cumulative lining is simulated numerically in Ansys Autodyn software. Ways of further development of the issue and explores the possibilities of functioning of shaped charges with a lining complex conical-ring type are discussed. Proposals for improving the cumulative lining of a complex conical-ring type are advanced, substantiated and numerically modelled.
Algorithm for markers detection on fringe images
Authors: Ubert A I
Published: January 2021

Thanks to non-contact scanning technology and its harmlessness to human health, the usage of numerous 3D scanners in various fields of medicine has considerably increased. For example, in orthopaedics, medical topographic system TODP uses structured light with fringe projection to determine the 3D relief of the dorsal surface of the trunk for the urgent task of diagnosing spinal deformities. To improve the accuracy of postural states analysis, anatomical landmarks of the skeletal bone structures are marked with high-contrast small-sized markers of the reflective film. Thus, the task of the marker’s detection in the image appears. The article discusses the algorithms for detection of small-sized bright markers in fringe images, obtained by the computer optical topography method. The experimental results have shown that the proposed algorithm can detect 99.94% of the reflective markers in a sample of 1000 images with 8350 markers in total.
Study of aluminium nanopowder combustion by method of laser-speckle correlation
Authors: Li L , Mostovshchikov A V , Ilyin A P , Gubarev F A
Published: January 2021

In this paper, we discuss an application of the method of laser-speckle correlation for studying the combustion process of aluminium nanopowder in air and its mixture of iron nanopowder. It is suggested to characterize the combustion process using the statistic parameter – correlation coefficient. The principle of observation is explained and the experimental schema for investigating is provided. The differences between aluminium nanopowder and its mixture with iron nanopowder are also considered.
The choice of feedstock for the biodiesel production with optimal physicochemical and low-temperature properties
Authors: Belozertseva N E , Bogdanov I A , Balzhanova A T , Kirgina M V
Published: January 2021

The transesterification reaction of sunflower, mustard and linseed oil with ethyl alcohol was studied using potassium hydroxide as a catalyst. The physicochemical properties and low-temperature characteristics of the feedstock and obtained products were studied. The most preferred feedstock for the biodiesel fuel production had been determined.
Engineering a cyclone pre-furnaces’ calculating method for combustion fine water-coal suspensions
Authors: Boyko E E , Ovchinnikov Yu V
Published: January 2021

The article is devoted to the method of engineering calculation of the cyclone pre-furnace for incineration of fine coal-water suspensions. This type of device use for ignition and burning fine water-coal suspension. At present there is still no methods allows to make engineering calculations in order to obtain physical damnations of cyclone pre-furnaces for this type of fuels.