bluuebunny/crossref_metadata_2025 huggingface dataset:
Mobility‐limited charge injection in cross‐linked polyethylene under extra high electric field
Authors: Zhu Xi , Yin Yi , Peng Suman , Wu Jiandong , Li Wenpeng , Chen Xin , Li Zhenyu , Guan Jianxin
Published: December 2020

In this study, characteristics of charge injection under extra high electric field (above 100 kV/mm) in cross‐linked polyethylene (XLPE) were investigated by experiments of conduction current and space charge. The results show that current density from low electric field to sample breakdown corresponds to space charge limited current (SCLC) theory. More specifically, Schottky current is similar to experiment current before 100 kV/mm, while the J–E curve conforms to a modified SCLC theory after 100 kV/mm. Besides, the non‐linear coefficient of J–E curve from 100 kV/mm to extra high electric field is smaller than theoretical value, and the injection depth of space charge is restricted as the field becomes higher than 100 kV/mm, which may be caused by the negative differential mobility of charge. Driven by extra high electric field, charge collides with lattice of dielectric and scatters. As a result, mean free time of charge decreases and charge mobility is reduced with the increased field. Consequently, considering the decrease in charge mobility, a mobility‐limited charge injection equation is proposed, and the validity of the proposed equation under extra high electric field is demonstrated by space charge simulation.
Underwater image restoration: A state‐of‐the‐art review
Authors: Fayaz Sheezan , Parah Shabir A. , Qureshi G. J. , Kumar Vijaya
Published: December 2020

Underwater imaging is one of the hot areas of research and is receiving considerable attention from the research community due to the challenges involved. Underwater images are prone to various distortions like poor contrast and colour deviation. Light scattering and light absorption in water medium are the main reasons for degradation in subaquatic images. Scattering of visible‐light energy reduces the sharpness of image whereas varying degrees of light attenuation travelling in water results in the colour change. Restoration of distorted underwater images is an ill‐posed and challenging problem. Various techniques and methodologies are being used to process and restore underwater images. In this study, we present a state‐of‐the‐art review of various conventional and computer vision‐based algorithms and techniques, developed so far, to present a clearer view of the methods used for underwater image restoration. We discuss various conditions for which the schemes have been developed as well as highlight the quality assessment methods used to evaluate their performance. We compare various state‐of‐art schemes based on various subjective and objective indices and discuss future research directions in the field of underwater image restoration.
An upgraded fruit fly optimisation algorithm for solving task scheduling and resource management problem in cloud infrastructure
Authors: Loheswaran K.
Published: December 2020

In this manuscript, an upgraded Fruit Fly Optimization Algorithm (FFOA) is proposed for optimising task scheduling and resource management processes. The proposed FOA algorithm is utilized to address the issues. In the proposed algorithm, every solution is represented by fruit fly. Every fruit fly upgrades their status through well‐organized smell search process. First, a basic approach is put forward to allocate every task for numerous resources and execution time is measured for every task. Second, the overloaded virtual machines (VMs) are identified and the load is balanced to obtain optimal system resource utilisation. The ability of Fly Task Scheduling Algorithm is to schedule the VMs execution time of tasks is minimal. The results of the Fruit Fly‐based algorithms such as Fruit Fly Task Scheduling Algorithm, Modified Fruit Fly Task Scheduling Algorithm, Improved Fruit Fly Task Scheduling Algorithm and Multi‐Swarm Fruit Fly Task Scheduling Algorithm (MSFFTSA) are proposed and analysed. The upgraded Fruit Fly Optimization algorithm of MSFFTSA is compared with different Fruit Fly algorithms. Finally, the proposed algorithm is compared with other algorithms and the experimental results shows that the proposed MSFFTSA technique is better than the other algorithms of the fruit fly algorithms.
Study on influence factors and restraining measures of composite insulator end heating caused by housing microstructure defects
Authors: Zhang Sida , Liao Ruijin , Cheng Li , Zhang Fuzeng , Zeng Xiangjun , Wang Tingting
Published: December 2020

In recent years, the quantity and proportion of heating defects have increased significantly with more composite insulators used in transmission lines and deterioration of early composite insulators. End heating is the main characteristic of this kind of defect in high‐temperature and high‐humidity areas. In this paper, microstructures of the housing material were observed through scanning electron microscopy and the key factors leading to temperature rise were studied through water absorption and power loss experiments. The results show that polarisation loss is the main cause of temperature rise and power loss increases exponentially with higher electric field intensity. The microporous structures of the housing material not only enhance the moisture absorption effect, but also affect the uniform distribution of the electric field. Due to the concentration of the local electric fields at high‐voltage end, the effect of porosity on temperature rise is more significant. By adjusting the shielding depth (i.e. installation height) of grading ring or adding a racetrack ring to restrain electric field intensity at high‐voltage end of composite insulator, the temperature rise in high‐humidity areas can be effectively reduced.
Two-fluid simulations of Rayleigh-Taylor instability in a magnetized solar prominence thread
Authors: Popescu Braileanu B. , Lukin V. S. , Khomenko E. , de Vicente Á.
Published: December 2020

Solar prominences are formed by partially ionized plasma with inter-particle collision frequencies, which generally warrant magnetohydrodynamic treatment. In this work, we explore the dynamical impacts and observable signatures of two-fluid effects in the parameter regimes when ion-neutral collisions do not fully couple the neutral and charged fluids. We performed 2.5D two-fluid (charge – neutrals) simulations of the Rayleigh-Taylor instability (RTI) at a smoothly changing interface between a solar prominence thread and the corona. The purpose of this study is to deepen our understanding of the RTI and the effects of partial ionization on the development of the RTI using nonlinear two-fluid numerical simulations. Our two-fluid model takes into account viscosity, thermal conductivity, and collisional interaction between neutrals and charge: ionization or recombination, energy and momentum transfer, and frictional heating. In this paper, we explore the sensitivity of the RTI dynamics to the prominence equilibrium configuration, including the impact of the magnetic field strength and shear supporting the prominence thread, and the amount of prominence mass-loading. We show that at small scales, a realistically smooth prominence-corona interface leads to qualitatively different linear RTI evolution than that which is expected for a discontinuous interface, while magnetic field shear has the stabilizing effect of reducing the growth rate or eliminating the instability. In the nonlinear phase, we observe that in the presence of field shear the development of the instability leads to formation of coherent and interacting 2.5D magnetic structures, which, in turn, can lead to substantial plasma flow across magnetic field lines and associated decoupling of the fluid velocities of charged particles and neutrals.
Parameterized reconstruction with random scales for radio synthesis imaging
Authors: Zhang L. , Mi L. G. , Zhang M. , Liu X. , Xu L. , Wang F. , Ruan Y. J. , Li D. Y.
Published: December 2020

Context. In radio interferometry, incomplete sampling results in a dirty beam with side lobes, which obscures the celestial structures. Before the astrophysical analysis, the effects of the dirty beam need to be eliminated, which can be solved with various deconvolution methods.

Aims. Diffuse astronomical sources observed by modern high-sensitivity telescopes tend to be complex morphological structures, often accompanied by faint features, which are submerged under the side lobes of the dirty beam. We propose a new deconvolution algorithm called random multiscale estimator (RMS-Clean), which is mainly used to solve the difficult reconstruction of diffuse astronomical sources.

Methods. RMS-Clean models the sky brightness distribution as a linear combination of random multiscale basis functions whose scales are obtained by randomly perturbing a preset multiscale list. Random multiscale models are used to approximate the uncertain characteristics of the scales of complex astronomical sources.

Results. When the RMS-Clean method is applied to simulations of SKA observations with realistic diffuse structures, it can reconstruct diffuse structures well and provides a competitive result compared to the commonly used deconvolution algorithms.
Prominence formation by levitation-condensation at extreme resolutions
Authors: Jenkins J. M. , Keppens R.
Published: December 2020

Context. Prominences in the solar atmosphere represent an intriguing and delicate balance of forces and thermodynamics in an evolving magnetic topology. How this relatively cool material comes to reside at coronal heights, and what drives its evolution prior to, during, and after its appearance, remains an area full of open questions.

Aims. We here set forth to identify the physical processes driving the formation and evolution of prominence condensations within 2.5D magnetic flux ropes. We deliberately focus on the levitation-condensation scenario, where a coronal flux rope forms and eventually demonstrates in situ condensations, revisiting it at extreme resolutions down to order 6 km in scale.

Methods. We perform grid-adaptive numerical simulations in a 2.5D translationally invariant setup, where we can study the distribution of all metrics involved in advanced magnetohydrodynamic stability theory for nested flux rope equilibria. We quantify in particular convective continuum instability (CCI), thermal instability (TI), baroclinicity, and mass-slipping metrics within a series of numerical simulations of prominences formed via levitation-condensation.

Results. Overall, we find that the formation and evolution of prominence condensations happens in a clearly defined sequence regardless of resolution, with background field strength between 3 and 10 Gauss. The CCI governs the slow evolution of plasma prior to the formation of distinct condensations found to be driven by the TI. Evolution of the condensations towards the topological dips of the magnetic flux rope is a consequence of these condensations initially forming out of pressure balance with their surroundings. From the baroclinicity distributions, smaller-scale rotational motions are inferred within forming and evolving condensations. Upon the complete condensation of a prominence ‘monolith’, the slow descent of this plasma towards lower heights appears consistent with the mass-slippage mechanism driven by episodes of both local current diffusion and magnetic reconnection.
A search for dust and molecular gas in enormous Lyαnebulae atz≈ 2
Authors: Decarli Roberto , Arrigoni-Battaia Fabrizio , Hennawi Joseph F. , Walter Fabian , Prochaska Jason X. , Cantalupo Sebastiano
Published: December 2020

Enormous Lyαnebulae, extending over 300−500 kpc around quasars, represent the pinnacle of galaxy and cluster formation. Here we present IRAM Plateau de Bure Interferometer observations of the enormous Lyαnebulae “Slug” (z= 2.282) and “Jackpot” (z= 2.041). Our data reveal bright, synchrotron emission associated with the two radio-loud active galactic nuclei embedded in the targeted nebulae as well as molecular gas, as traced via the CO(3−2) line, in three galaxies (two sources in Slug, and one in Jackpot). All of the CO emission is associated with galaxies detected in their rest-frame UV stellar emission. The total mass in molecular gas of these three galaxies [∼(3 − 5) × 1010M⊙] is comparable with the total ionized gas mass responsible for the diffuse nebular emission. Our observations place limits on the molecular gas emission in the nebulae: the molecular gas surface density is ΣH2 <  12 − 25M⊙pc−2for the Slug nebula and ΣH2 <  34 − 68M⊙pc−2for the Jackpot nebula. These are consistent with the expected molecular gas surface densities, as predicted via photoionization models of the rest-frame UV line emission in the nebulae, and via Lyαabsorption in the Jackpot nebula. Compared to other radio-loud quasars atz >  1 and high-redshift radio-loud galaxies, we do not find any strong trends relating the molecular gas reservoirs, the radio power, and the Lyαluminosities of these systems. The significant step in sensitivity required to achieve a detection of the molecular gas from the nebulae, if present, will require a substantial time investment with JVLA, NOEMA, or ALMA.
Formalized reliability analysis during the electric power systems modes management
Authors: Sigitov O.Yu. , Chemborisova N.Sh. , Chernenkov I.D.
Published: December 2020

The current problem of the selection of the electric power system control nodes, which can be used to solve multicriterial problems of the consumers reliable supply with the electric power of the necessary quality of maximum efficiency is investigated. At the same time, a new method of making decisions while choosing electric power system control nodes is proposed. It is necessary to take into account a set of different types of indicators which characterize different properties of these nodes.
Components of the power balance consumption and their influence on the procedure of competitive power selection UES of Russia
Authors: Chukreev Yurii , Chukreev Mikhail
Published: December 2020

The impact of the time aspect in planning of the maximum load and the standard capacity reserve on determination of the price for the power capacity while the competitive power selection procedure is described. The article illustrates the fundamental differences between the concepts of the load forecasting error caused by the temperature factor and forecast volume of power consumption, considering it in power capacity demand formation. The results of the impact made by these factors on the competitive power selection procedure are presented.
Technical diagnostics of electrically operated valves at npp
Authors: Akhmetshin A.R , Golomidov V.N , Vildanov R.R
Published: December 2020

The article discusses the possibilities of technical diagnostics of electrically operated valves at nuclear power plants in order to increase their reliability and service life, as well as to achieve maximum operation efficiency of systems in nuclear power plants.
Inverter generator sets for grids carrying heavy-load users
Authors: Ilyushin Pavel , Simonov Aleksandr
Published: December 2020

Inverter generator sets (GS) are increasingly common in the electricity industry. The paper dwells upon the core advantages and issues of integrating inverter generator sets that must be considered at the design stage to make informed decisions. The authors present examples of computing the electrical parameters of inverter generator sets in a variety of operating situations. The calculated electromechanical transients show inverter GS’s are more efficient compared to conventional synchronous generators for grid nodes that are ‘weakly connected’ to the grid as well as for islanded operation. The paper further proves that automatic control systems of GS inverters can feasibly feature parameter control laws that conform to the general and additional requirements of the system, which in turn are based on the parameter calculations. It shows that a feasibility study is needed to decide whether to use inverter GS’s.
Flexibility of the power system: background, relevance, and categorization
Authors: Efimov Dmitry
Published: December 2020

The definitions of flexibility and the place of flexibility in the structure of the main general properties of energy systems are given. The factors and trends are indicated, which determine the appearance of current energy systems, and even more future energy systems. The emerging trends will require a revision of the principles and means of power system management and control towards increasing the flexibility. Based on these factors, it is possible, firstly, to analyse flexibility as a complex property, using differentiation by aspects and categories, and, secondly, to determine and categorize the means of ensuring flexibility. The paper concludes with the European energy regulators' view of flexibility as a marketable service.
An asynchronized synchronous machine to control a flexible grid operation
Authors: Suprunov Igor S. , Dvorkin Dmitry V. , Novikov Aleksander N. , Novikov Nikolay L.
Published: December 2020

In this paper, a system of two asynchronized synchronous machines is proposed to control a power-flow in a meshed grid of 220/500 kV and a control algorithm, including a system parameterization guide. The proposed system is supposed to qualitatively affect the parameters of steady-state modes and shirt-circuit-caused transient processes and to increase the transfer capacity of the grid. Wherein, this double-fed synchronous machines complex allows for a significant increase in the power quality and reliability within the grid’s normal operation. Long-term dynamics is considered. As a result, it is shown that the proposed system parametrization provides a significant decrease in active power fluctuations and power system swinging.
Analysis of cyber vulnerabilities of the emergency control and relay protection to assess the reliability and survivability of electrical power systems in the era of total digitalization
Authors: Osak Alexey , Panasetsky Daniil , Buzina Elena
Published: December 2020

Cyber threats pose an increasing threat to energy objects. It is essential to ensure the cybersecurity of automatic control systems, such as relay protection devices (RP), devices of regime control (RC) and emergency control (EC), automated control systems. At the same time, the issues of cybersecurity include not only the problem of hacker attacks, but also the whole complex of problems relating to adequate functioning of cybernetic systems in the power industry. The authors consider two of the most acute aspects of cybersecurity in the energy systems of the future in the era of total digitalization: large-scale prepared cyber attacks on the electrical power systems (EPS) as a whole and large-scale cyber attacks on distribution networks with small-scale generation facilities and active consumers.
Reliability components of the WAMS information network
Authors: Uspensky M.I.
Published: December 2020

Power system modes can be controlled by use of a wide-area monitoring and control system (WAMS). It is based on the phasor measurement units (PMUs), connected by an infor-mation network covering a significant territory. The functioning reliability of such a network deter-mines to a big extend the correct operation of the entire monitoring system. To assess its reliability, the one can be decomposed conveniently into four components: hardware or technical reliability, traffic reliability, software reliability, resistance to external negative impact on the transmitted in-formation, and to consider each m independently. In this paper, the main attention is paid to as-sessment of the reliability and availability of the first three components in the information network.
Experimental system for continuous monitoring of overhead power lines and substations insulation
Authors: Zaripov Damir , Nasibullin Rustem
Published: December 2020

This paper describes a system for monitoring the insulation condition of overhead power lines and substations based on sensors installed on towers and insulators. The sensors works on the capacitive coupling with an insulating structure and register the appearance and growing of electrical discharges near the insulators. The data from the sensors with a predetermined frequency (from 1 minute or more) are transmitted throw cellular communication to the operating service computer (smartphone) and presents as changing graphs on the screen. In this paper in operation and functional diagram of the system are proposed with described results of tests and experiments with manufactured product samples in laboratory and field conditions on an operating 110 kV line. The results of field experiments shows the advantages of the system to monitor the insulation in comparing with traditional diagnostic devices.
Optimal modeling of the heat transfer of a viscous incompressible liquid
Authors: Nazarov Serdar , Rakhimov Muhammetberdi , Khekimov Gurbanyaz
Published: December 2020

This paper discusses mathematical models of the heat transfer process of a viscous incompressible fluid. Optimal control methods are used to solve the problem of optimal modeling. Questions of linearization of the Navier - Stokes equation are considered. The optimal modes (optimal functional dependencies) of the pump and heating device are found depending on the fluid flow rate.
Method for the diagnosis of high-voltage dielectric elements during operation based on dynamic registration of electromagnetic radiation
Authors: Ivanov Dmitry , Galieva Tatyana , Sadykov Marat , Golenischev-Kutuzov Alexander , Naumov Anatoly
Published: December 2020

Complex remote monitoring and the developed non-contact diagnostic device (NDD) allow monitoring the technical condition and revealing the residual life of high-voltage dielectric elements. It is based on non-contact remote periodic measurement of a set of diagnostic parameters (characteristics of electrical discharges emitted by insulators during operation) necessary for a reliable assessment of the operating state of high-voltage dielectric equipment at the moment of operation and determination of its residual life. NDDs are installed on each phase conductor and used to measure diagnostic parameters, followed by computer processing of the accumulated information signals. An analysis of the set of necessary diagnostic parameters makes it possible to form a conclusion on the degree of performance of dielectric elements. The paper considers a method for detecting defective high-voltage insulators using the developed non-contact diagnostic devices by the radio frequency method and assessing the difference in time of arrival of a partial discharge signal.
Testing digital instruments and power systems devices
Authors: Pavlov Pavel , Fandeev Vladimir , Butakov Valery , Baymeeva Dilyara , Safiullina Venera
Published: December 2020

Discussed here is a technique for testing digital devices based on the calculation and control of two or more characteristics of a binary electric signal at a reference point. Signals coming from a healthy and failed digital device that are indistinguishable by the value of one of the characteristics may differ in value of the other characteristic. The combination of test methods can significantly reduce the potential of not detecting the failure of digital device. The technique is aimed at increasing the information content of the healthy state monitoring results and the possibility of localizing failures in digital instruments and devices of power systems.
Effects of asynchronized generators on emergency modes of power mains with inferior power quality
Authors: Bulatov Yuri , Kryukov Andrey , Shumansky Edward
Published: December 2020

Application of asynchronized generators (ASG) in distributed generation plants allows to obtain the following positive results: increase stability margins; expand reactive power adjustment ranges; simplify processes of synchronization to line due to possibility of frequency and EMF phase control; ensure the unit’s operation in synchronous mode when one of excitation windings is damaged. The work provides description of the developed ASG computer model and the system of excitation automatic control. The studies are conducted in the MATLAB system using the Simulink and SimPowerSystems software packages. Emergency modes were simulated for the mains with ASG-based distributed generation plants in conditions of inferior power quality. ASG influence on emergency modes and levels of harmonic distortions in the mains were determined.
Determination of thermally stressed state of rod elements of variable cross section under the impact of a lateral heat flow, heat exchange and surface thermal insulation
Authors: Akhmetov Sayranbek , Kudaykulov Anarbay , Bizhanov Dossan
Published: December 2020

A horizontal bar of limited length is considered. The radius of the bar changes linearly along its length. The cross-sectional area of the left end is larger than the right. The lateral surface of the investigated rod is completely insulated. The heat flux is applied to the cross-sectional area of the left end. Heat exchange with the environment takes place through the cross-sectional area of the right end of the rod. The work determines the field of temperature distribution, displacement, three components of deformation and stress, provided that both ends of the rod are rigidly fixed. The amount of bar elongation is also determined when one end of the bar is fixed and the other is free. In case when the two ends of the bar are fixed, the value of the resulting axial compressive force is calculated. In this study the fundamental laws of conservation of energy were used.
Mathematical modeling of low-frequency diagnostic vibration-acoustic vibrations of linear-extended energy objects of housing and communal services
Authors: Zakharova V.E. , Gaponenko S.O. , Fedotova A.O.
Published: December 2020

A modal analysis of natural vibrations of polyethylene pipelines is proposed, which is a calculation of the vertical and lateral pressure exerted by the soil on the pipelines, on the basis of which the study of vibrations in the ANSYS software package was carried out. The results of modal analysis are presented for polyethylene pipes with a layout with inclined walls and various soils.
On the issue of inertial excitation of diagnostic low-frequency vibrations in pipelines of housing and communal services
Authors: Shakurova R Z , Gaponenko S O. , Kondratiev A E.
Published: December 2020

The article discusses and analyzes issues related to the diagnosis of the technical condition of pipelines for housing and communal services. The main attention is paid to the inertial excitation of diagnostic low-frequency vibrations in the pipeline wall using the developed device. The results of experimental studies are presented.
Use of kinetic flow energy liquids for vibration of local turbulizers in pipe heat exchangers
Authors: Babakhodjaev Rakhimjan , Tashbaev Nazim , Mirzaev Djonreed
Published: December 2020

This issue of using certain part of the kinetic energy of the flow for imparting vibration for special local turbulators (LT), consisting of an elastic thread with strung on it through a certain distance volume elements (made of a special material) of various geometric configuration installed in the tubes of the heat exchanger with fixing one end of the thread at the inlet, and the other end remains free. The results of numerical and experimental studies are presented, which show the effectiveness of the use of LT for intensifying the processes of hydrodynamics and heat transfer.
Multi-Factor Analysis of External Effects Influencing the Operational Reliability of Asynchronous Electric Motors
Authors: Romanova Victoria , Khromov Sergey , Suslov Konstantin
Published: December 2020

The paper considers the main issues of increasing the operational reliability of low-voltage asynchronous electric motors based on a set of studies performed using simulations in the Simulink Matlab software environment. The study defines the allowable operation of asynchronous electric motors under the influence of operational factors. We have conducted the analysis and discussion of the research results and suggested measures aiming to increase the operational reliability of asynchronous electric motors.
Optimization of Electrical Networks Modes on Transformation Coefficients of Transformers
Authors: Gayibov Tulkin , Latipov Sherkhon , Abdurashidov Davron
Published: December 2020

Optimization of modes of electrical networks provides for the determination of rational values of reactive powers of controlled sources, voltages of reference nodes and transformation coefficients of adjustable loop transformers, at which the minimum costs associated with the production, transmission and distribution of electricity are ensured and all the specified operating and technological constraints are met. As a result of a lot of work performed by specialists from all over the world on the development of methods and algorithms for optimization the modes of electrical networks, at present, the methods for optimization of reactive powers and voltages of nodes are quite developed. At the same time, the algorithms for optimization of transformation coefficients of transformers, taking into account the provision of permissible voltage levels and minimum energy losses in closed electric networks by ensuring the optimal distribution of power flows in them, requires corresponding improvement. In this regard, this work proposes a new algorithm for optimization of modes of electrical networks on transformation coefficients of adjustable loop transformers. The results of researched the effectiveness of the proposed algorithm are presented.
Application of artificial neural networks in the process of drying CPC
Authors: Bakhtiar Yunusov
Published: December 2020

Training of artificial neural networks using the experimental data obtained in the process of drying of cotton powdered cellulose (CPC), have shown that, experiments can be conducted on the computers, which solves many of the practical and ethical issues. Therefore, arose and remain at the present time, the objective of neural simulation of processes and create a computing system (artificial neural network)
Some features of the grinding process in the production of powder materials
Authors: Yunusov Bakhtiar , Normuminov Jakhongir
Published: December 2020

The article sets out some of the features of the grinding process in the production of powdery materials. Analysis of the literature review on the current state of the issue under study. The general characteristics of the production of powdery materials are studied, the properties of powdery materials as an object of technological processing, including hydromechanical characteristics, are considered.
Networked interactive solar panels over the roof photovoltaic system (PVS) and its cost analysis at Tashkent state technical University
Authors: Saitov E.B. , Toshov J.B. , Pulatov A.O. , Botirov B.M. , Kurbanov Yu.M.
Published: December 2020

There is great potential for generating solar energy using unused space on roofs and vacant lots around buildings. Small amounts of energy generated by each individual household, industrial building, commercial building, or any other type of building can be used to partially meet the needs of the building's residents, and the surplus, if any, can be fed to the grid. To use the existing roof space of buildings, SPV systems on the roof of buildings can be installed to replace DG generators installed to provide the minimum load required to operate during load shedding. TSTU has a large unused roof area from both residential and office buildings. Therefore, it has a huge potential for generating solar energy by installing a grid-connected Solar system on the roof. We can reduce a large amount of bills by implementing a solar power plant. The government has also launched various solar energy incentive schemes, this article provides a brief overview of rooftop photovoltaic and small-scale solar generation systems, and discusses various government schemes. Since TSTU has a large scope for this scheme, so the calculation of the design capacity was made for the technological College and one residential building. A method has been developed for calculating the capacity of Autonomous solar power plants and its elements, which allows us to take into account changes in the load during the day and thereby accurately determine the required capacity of the battery and eliminate unjustified overestimation of the power of power plant elements and increase the cost of the Autonomous solar power plant itself.
Theoretical studies of sorting rice seeds in the electric field
Authors: Rosaboev A.T. , Shaimova S.P.
Published: December 2020

The article provides information about the device, the principle of operation of the developed dielectric device for sorting rice seeds, the results of determining the design parameters of bipolar electrodes and theoretical studies to substantiate the angle of separation of rice seeds from the surface of the working body and the magnitude of the applied voltage to bipolar electrodes, as well as the coordinates of the axis of the separation plane of the receiving hopper. The results of theoretical studies revealed that with a working body diameter of 350 mm and a frequency of its rotation of 50 min-1 for sorting rice seeds on a dielectric device, it is enough to apply a voltage of about 1500 V to the multipolar electrodes. At the same time, for a clear separation of rice seeds torn off from the working surface into the sowing and technical fraction, the coordinates of the axis of the dividing plane of the receiving hopper should be set from the axis of rotation of the working body at a distance: horizontally 165 mm and vertically 300 mm, with its height 150 mm.
Mathematical models and algorithms of optimal load management of electrical consumers
Authors: Reymov K M , Turmanova G M , Makhmuthonov S K , Uzakov B A.
Published: December 2020

The article investigated the static, dynamic and metrological characteristics of new magnetoelastic force sensors taking into account the distribution of Load profile smoothing based on optimal power management is considered to be one of the main ways to ensure efficient operation of energy systems in the short-term planning. Smoothing load profile with a view to reducing costs can be implemented on the ways in which consumers could be affected by administrative and economic measures. Administrative measures are associated with the forced restriction of consumer loads in certain intervals of the planning period. On the one hand, these measures provide benefits to the power system by smoothing load profile, and on the other hand, they cause damage to consumers. Ultimately, in some cases, the damage may be greater than the benefits as a whole to the power system. Therefore, it is advisable to use them in conditions of shortage of power and electricity in the power system. Optimal planning of short-term regimes of power systems according to received, after alignment, rigid load profile can be carried out by traditional methods. The solution of such a problem can be initially carried out under conditions of non-rigid load profile resulting from the directive use of administrative and economic measures carried out with the help of specially developed models. In this regard, the paper proposes a mathematical model of the problem of optimizing load profile of regulated electrical consumers with optimal planning of short-term power system modes, an algorithm for optimal planning of a short-term power system mode with optimizing load profile of regulated power consumers. And also, algorithms are proposed for accounting for simple and functional constraints in the form of equalities and inequalities when optimizing load profile. The effectiveness of the described algorithm for optimizing the short-term mode of the power system, taking into account the optimal load control of adjustable electric locomotives, has been studied using the example of optimal coverage of the load profile of power system, which contains two consumers with adjustable load profile, and two TPPs. Based on the calculated experimental studies computational qualities, it was determined that the proposed mathematical model of the problem is adequate, the developed algorithms for optimal planning of short-term power system modes with optimization of load profile of regulated electric consumers and taking into account various types of limitations have high computational qualities.
Statistical models of renewable energy intermittency
Authors: Rakhmonov I U , Reymov K M
Published: December 2020

One of the big mitigating factors of intermittency is the smoothing effect of geographical distribution of variable renewable energy (VRE ) plants on the aggregate power output of VRE generation on a utility network. The greater the distance between two renewable plants, the less likely their output is to be affected by the same weather event (e.g. cloud coverage, storms, dust storms). This is similarly the case for smaller timescales. Further, different technologies can often be uncorrelated or even negatively correlated (e.g. wind and solar) which reduces the integration cost. In this article analyzed and quantify the expected intermittency in Uzbekistan focusing on the geographical dispersion by looking at various sites as well as by looking at a portfolio composed of different technologies.
The concept of a system of comfortable public spaces in the city of Kursk
Authors: Pozdnyakov Andrey , Tsurik Tatyana
Published: December 2020

The article deals with the problem of the improvement of public spaces in large cities on the example of Kursk. The author suggests using the existing infrastructure of the city to create a comfortable environment and increase its recreational opportunities for local residents and tourists. The study is aimed at creating a system of comfortable public spaces using the ecological, historical and cultural resources of the city, where the parks and squares of Kursk play a key role. The practical use of this concept contributes to the improvement of the city’s image and the development of a comfortable urban environment.
Increasing the forecasting fidelity of current collection system operating capability by means of contact pressure simulation modelling
Authors: Golubkov Anton , Ermachkov Gleb , Smerdin Aleksandr , Sidorov Oleg , Philippov Victor
Published: December 2020

Current collection quality is one of the limiting factors when increasing trains movement speed in the rail sector. With the movement speed growth, the impact forces on the current collector from the rolling stock and the aerodynamic influence increase, which leads to the spread in the contact pressure values, separation of the current collector head from the contact wire, contact arcing and excessive wear of the contact elements. The upcoming trend in resolving this issue is the use of the automatic control systems providing stabilization of the contact pressure value. The present paper considers the features of the contemporary automatic control systems of the current collector’s pressure; their major disadvantages have been stated. A scheme of current collector pressure automatic control has been proposed, distinguished by a proactive influence on undesirable effects. A mathematical model of contact strips wearing has been presented, obtained in accordance with the provisions of the central composition rotatable design program. The analysis of the obtained dependencies has been carried out. The procedures for determining the optimal current collector pressure on the contact wire and the pressure control principle in the pneumatic drive have been described.
Relationship of information technology and customer loyalty in air transport
Authors: Waramontri Rojanard
Published: December 2020

Customer loyalty is the key indicator of business success on online firms. Many organizations in the Airline Industry have add value of e-service not only aiming to be competitive but also to reduce costs and to increase revenues. Nowadays, the development of Information Technology (IT) has brought organizations in the air transport to grow rapidly. This led organizations in the air transport to build long-term relationships with their passengers. Thus, this study was conducted to investigate the relationship of customer loyalty and the information technology of airlines industry by analyzing 88 data collected from passengers using e-service offered by organizations in the air transport. Three dimensions of online service were identified namely: word of mouth, web sites design and ease of use. The findings from regression analysis demonstrated thate-word of mouth commit to customer loyalty. Several implications and recommendations for organizations are outlined.
Bottom-hole pressure optimization when operating the well lateral horizontal hole
Authors: Faizullin Rinat , Miroshnichenko Sergey , Sultanov Ravil
Published: December 2020

The problem of optimization of technological parameters as a way to improve the efficiency of oil deposit exploitation is considered in the paper. There are no standards for parameters of well bottom-hole pressure for exploitation of lateral horizontal holes. The paper presents the evaluation of optimum bottom-hole pressure at which it is advisable to exploit the deposit lateral horizontal hole with maximum “water-free” production rate. Following the calculations carried out and analysis of the graphs of additional oil and liquid production dependence on bottom-hole pressure, graphs of production dynamics and water encroachment, it was concluded that 3 groups of drilling (kickoff) of lateral holes (KLH) should be distinguished: with high forecasted starting water encroachment (>90%), average starting water encroachment (about 80%), and low starting water encroachment (about 20-50%). The distinguished 3 groups allow applying the differentiation of parameters, for which optimum bottom-hole pressure parameters for each drilling group were found.
Monitoring of glaciers in the Polar Urals using remote sensing Data
Authors: Martynova Natalia , Budarova Valentina , Sheremetinsky Artem , Mezentsev Nikita
Published: December 2020

The development of technological progress provides more opportunities for indirect monitoring of changes in the environment. Remote sensing is one of The most accessible and reliable sources of information. In this work, we used satellite images from the Landsat family. The theoretical justification of the research question is given. The research methodology was developed. Collection and processing of satellite images for various time periods. A series of schematic maps based on remote sensing Data has been created. As a result of digitization of satellite images, 9 glacier contours were obtained by year. We determined the area of the Romantics glacier and found that it lost at least 60% of its original area. These studies were used to build a series of cartographic schemes that clearly show the reduction of the glacier area. It is concluded that the use of remote sensing allows you to solve problems, monitoring the object. The use of this method allows not only to save time for field work, but also material costs for expedition equipment and various equipment. This method can be tested on any objects.
Problem of Slagheaps of Donbass
Authors: Sleptsov Yuri
Published: December 2020

The intensive development of the coal mining industry has led to an increase in a number of environmental problems that have turned the Donbass region into a depressed one. The coal seam is mined at depth. As a result, in many places, groundwater flows into the formed openings, which leads to the disappearance of water from wells and boreholes, dehydration of the upper soil layers and even the disappearance of a number of natural lakes and rivers, and the impossibility of irrigation in agriculture. The second side of the problem is the appearance of the so-called mine dumps or slagheaps during the operation of any mine. These human-made conical pyramids have become a serious environmental hazard. The solution to these problems is possible through the creation of a free economic zone and the introduction of innovative approaches to solving a set of problems.
Environmental disasters as a factor of environmental pollution
Authors: Semenova Galina
Published: December 2020

An ecological catastrophe consists in a massive change in natural conditions that lead to a change in the environment and the death of living organisms. Disaster can be caused by both natural processes and human actions. Losses after such disasters are often irreparable. Economic reasons worse the ecological situation. Wastewater treatment plants are very expensive, so industrialists often prefer to save on and forget about the environment during the construction and operation of new production facilities. The pursuit of immediate profits without thinking about tomorrow, undoubtedly, deepens the crisis in the field of ecology, thereby resulting in environmental disasters. The subject of this study is global environmental disasters. The purpose of the study is to identify the influence of the negative impact of substances on the environment. Methodology. To study the topic, the world environmental disasters and the damage caused by their impact on the environment were systematized. Results - the damage (harm) from the negative impact on the environment was revealed, the calculation formulas were given.
Improvement of environmental indicators of coal energy and agricultural production due to the integration and diversification of these industries
Authors: Trushkova Ekaterina , Omelchenko Elena , Sidelnikov Mikhail
Published: December 2020

At present, there is extensive experience in the use of sulfuric acid ameliorant for soils with soda type of salinity. The authors found that as a result of using a weak solution of sulfuric acid on soils containing sodium and hydrocarbonates in their salt composition, their agrochemical characteristics are significantly improved. The article presents the results that show that the production of fertilizers and ameliorants from the waste of energy enterprises will increase their environmental safety. The use of sulfur oxides captured from the flue gases of coal-fired energy enterprises as a raw material for the production of sulfuric ameliorant will allow solving a double task: to reduce pollution of the zone of influence of enterprises and improve the condition of lands with soda salinization.
Contribution of tourism to diversification and development of a green economy
Authors: Brel Olga , Zaytseva Anna , Kaizer Phillip
Published: December 2020

In the current economic situation, the solution to the problems of diversification of mining regions is relevant not only in terms of economic outcome, but also the need to change the ecological situation in industrial regions towards its improvement. Diversification of the region’s economy is associated with the idea of expanding the range of economic activities and considered as a mechanism to reduce risks and mono-dependence of the regional economy. The study suggests that tourism could become one of the areas of diversification and greening of the mining region economy by the example of the Kemerovo region. The structure of the GRP and individual indicators characterizing the state of the tourism sector were analyzed to assess the impact of tourism on the diversification of the economy of the Kemerovo region. Despite the fact that the total share of the tourism sector has changed slightly over the 5 years, its multiplier effect has a positive impact on the state of the service sector and the economy of the entire region. It was confirmed by the results of the analysis. The optimistic scenario for the development of the Kemerovo region determines the large role of tourism in the diversification and greening of the region’s economy. The implementation of the conservative scenario that provides the supportive development of traditional sectors, does not exclude opportunities for the development of tourism, which will ensure the effective and long-term sustainable development of the Kuzbass.