bluuebunny/crossref_metadata_2025 huggingface dataset:
Hf0.5Zr0.5O2‐based ferroelectric bionic electronic synapse device with highly symmetrical and linearity weight modification
Authors: Tian Guo‐Liang , Bi Jin‐Shun , Xu Gao‐Bo , Xi Kai , Xu Yan‐Nan , Yang Xue‐Qin , Yin Hua‐Xiang , Xu Qiu‐Xia , Li Yong‐Liang
Published: April 2020

Bionic electronic synapses with weight‐modulation properties are promising alternative candidates when compared with traditional CMOS based neuromorphic hardware when building at‐scale neural networks for efficient neuromorphic computing. In this Letter, due to the partial polarisation switching of multi‐domain properties in polycrystalline Zr‐doped HfO2 (HZO) ferroelectric materials, a capacitor‐based bionic synapse was proposed, which showed multi‐level capacitance modulation characteristics. By switching the voltage‐controlled polarisation, the capacitance was gradually modulated via the variation of net polarisation vectors in the HZO layer. The potentiation and depression properties can be achieved with better linearity, symmetry and multiple states. This Letter laid the groundwork for realising the high‐density integration neuromorphic computing system by using ferroelectric capacitors as the bionic synapse.
Continuously tunable 360° phase shifter based on planar waveguide technology for MM‐wave applications
Authors: Rahimian Omam Z. , Abdel‐Wahab W.M. , Gigoyan S. , Safavi‐Naeini S.
Published: April 2020

A continuously tunable phase shifter based on a substrate integrated waveguide (SIW) is proposed for high‐performance applications at millimetre‐wave frequencies. The proposed phase shifter consists of two slots cut on the SIW's broad wall and a high dielectric constant (HDC) slab over the slots. The phase shifting mechanism is based on perturbing the electric field of the SIW‐slot by putting a HDC slab over two slots. The fabricated phase shifter exhibits linear phase‐frequency response behaviour with an average insertion loss less than 2 dB over a phase shift range of in the operating frequency band (29–31 GHz).
Secrecy capacity and optimal time allocation for MISO wiretap channel with a multiple‐antennas jammer
Authors: Liu Xiaoming , Li Bin , Zhao Feng
Published: April 2020

A closed‐form expression of the achievable secrecy rate is derived in this study, which is used as the objective function to find the optimal time allocation of channel estimation and transmission. Theory analysis and numerical results demonstrate that the maximum secrecy capacity depends on the total time budget as well as the power at the transmitter.
Physical layer security in space‐time block codes from coordinate interleaved orthogonal design
Authors: Baghaei Pouri Alireza , Torabi Mohammad
Published: April 2020

In this study, the physical layer (PHY) security performance of orthogonal space‐time block coding (OSTBC) employing a coordinate interleaved orthogonal design (CIOD) is analysed and investigated using two metrics: average secrecy capacity and secrecy outage probability. It is shown that the CIOD system is superior than OSTBC in terms of secrecy outage probability. Closed‐form expressions for PHY security metrics in OSTBC as well as CIOD are presented and compared. Then, an extended model of CIOD with arbitrary number of antennas is considered. Furthermore, the effects of artificial noise and imperfect channel estimation on PHY security of OSTBC and CIOD systems are investigated. The validity of theoretical expressions is verified by simulation, and it is shown that in practical cases the CIOD system has a better secrecy outage performance than that of the OSTBC system.
Limited‐budget finite‐time average consensus design for multi‐agent systems
Authors: Wang Le , Xi Jianxiang , Yu Zhiyong , Liu Xia , Liu Guangbin
Published: April 2020

This study investigated the limited‐budget finite‐time average consensus problem of multi‐agent systems. Different from the existing results about the guaranteed‐cost asymptotical consensus, all agents can achieve the average consensus within a finite time and the limited budget can be given previously. Firstly, a novel consensus protocol is proposed with non‐linear cost indexes to trade off the control energy consumption against the consensus regulation performance for the limited budget within a finite time. Then, sufficient conditions for limited‐budget finite‐time average consensus design and analysis are respectively given, where the limited budget is utilised to determine the value range of the control gain, and the consensus value obtained by all agents is the average of initial states. Moreover, for the case without giving the limited budget, guaranteed‐cost finite‐time average consensus design and analysis criteria are presented, respectively, in which an upper bound of the cost index is determined. Finally, a numerical simulation is shown to illustrate the effectiveness of theoretical results.
Observer‐based state tracking for discrete linear multi‐agent systems with switching topologies via learning control strategies
Authors: Luo Zijian , Xiong Wenjun , He Wangli , Chen Yao
Published: April 2020

In this study, the consensus tracking problem of discrete linear systems is investigated in the presence of two kinds of switching topologies, which means two independent switching topologies in the control network and the observation network are considered, respectively. Distributed observer‐based learning control strategies are proposed to solve the consensus tracking problem effectively when the state information of each node is unavailable. Meanwhile, distributed initial state learning strategies are designed to improve the tracking performances. Some sufficient conditions are derived to guarantee the asymptotical convergence of the consensus tracking error. It is interesting to find that the initial learning strategies play significant roles in the theoretical analysis. In the end, the effectiveness of obtained results is demonstrated by a simulation example.
Coupled circuit analysis of the brushless doubly fed machine using the winding function theory
Authors: Olubamiwa Oreoluwa I. , Gule Nkosinathi , Kamper Maarten J.
Published: April 2020

The brushless doubly fed induction machine (BDFM) is considered as an alternative to doubly fed induction generators (DFIGs) in wind energy conversion systems. However, BDFMs have a complex machine structure, and their operations are relatively complicated. In this study, the winding function theory is used in the development of a coupled circuit (CC) model for BDFMs with nested loop (NL) and cage+NL rotors, in order to give a robust representation of the electrical operations of BDFMs. The electrical circuit analysis of BDFMs having NL and cage+NL rotors is comprehensively detailed, with the stator and rotor inductances calculated using their winding functions. The interactions of BDFM rotor loops with stator windings are demonstrated in terms of mutual inductances. CC models of different BDFMs are simulated for synchronous doubly fed BDFM operations with an emphasis on generating regions. Also, fresh insight into the torque production in BDFMs is provided, with the rotor loops and stator winding contributions to torque magnitude and ripple examined.
Photovoltaic system operation as DSTATCOM for power quality improvement employing active current control
Authors: Patel Nirav , Gupta Nitin , Babu B. Chitti
Published: April 2020

This paper presents photovoltaic (PV) system control as distributed static compensator (DSTATCOM), termed as PV‐DSTATCOM, operated with active current control (ACC) and feed‐forward control loop (FFCL). Besides active power injection into the utility grid, the proposed PV system autonomously transforms into a DSTATCOM to provide various ancillary services including source current harmonic suppression, load reactive current compensation, zero sequences component mitigation, and power factor correction. Since PV‐DSTATCOM operates with ACC, it precisely extracts the fundamental in‐phase and quadrature components of current. It introduces high‐gain at the third‐order harmonic and thereby alleviates stationary errors in the current control loop of PV inverter. The proposed ACC+FFCL structure is computationally efficient and unconditionally stable. Practically, FFCL addresses the challenges emerged due to nonlinearity introduced by the PV unit and ensure a rapid power balance between the PV unit and electric grid. Further, a simplified perturb and observe based maximum power point tracker has been employed to evacuate the maximum power from the PV array. The proficiency of the developed ACC+FFCL structure is investigated through a comprehensive set of transient studies using MATLAB/Simulink software. Finally, a laboratory setup has been developed using the dSPACE‐1104 platform and experimental results are recorded with detailed comparative evaluation.
Impact of local PMU‐based equivalent methods on real‐time voltage stability assessment
Authors: Silva Fábio D. , Vale Maria Helena M. , Andrade Marina M.S.
Published: April 2020

This study promotes a critical discussion about the phasor measurement unit (PMU)‐based equivalent methods in order to investigate the impact of the Thévenin equivalent (TE) parameters on real‐time power system voltage stability assessment. Although several articles indicate good performance at impedance magnitude matching theory, they neglect the influence of TE impedance angle and voltage source magnitude, introducing inaccuracies or mathematical inconsistencies in stability evaluation. The former three parameters are highlighted in this study due to being directly used to compute active power margins and indexes, according to the maximum power transfer theorem. The approach identifies the methods’ robustness and weaknesses by the use of generic expressions. The main contribution of this study is presenting equations for directly calculating the parameters that may lead to inconsistent interpretations, particularly when measurement noise is considered. Disregarding these inconsistencies may result in an incorrect determination of the system's critical limit, increasing the risk of voltage instability. The conception of the new formulation relies on network equivalents based on the least‐squares method, Tellegen's theorem and adaptive method. Following the simulations carried out in Nordic Test System, and 9, 14 and 39 Bus Test Cases available in MATPOWER, analyses substantiated in the derived expressions are given.
Using Sky‐pointing fish‐eye camera and LiDAR to aid GNSS single‐point positioning in urban canyons
Authors: Bai Xiwei , Wen Weisong , Hsu Li‐Ta
Published: April 2020

Robust and globally‐referenced positioning is indispensable for autonomous driving vehicles. Global navigation satellite system (GNSS) is still an irreplaceable sensor. Satisfactory accuracy (about 1 m) can be obtained in sparse areas. However, the GNSS positioning error can be up to 100 m in dense urban areas due to the multipath effects and non‐line‐of‐sight (NLOS) receptions caused by reflection and blockage from buildings. NLOS is currently the dominant factor degrading the performance of GNSS positioning. Recently, the camera has been employed to detect the NLOS and then to exclude the NLOS measurements from GNSS calculation. The exclusion of NLOS measurements can cause severe distortion of satellite distribution, due to the excessive NLOS receptions in deep urban canyons. Correcting the NLOS receptions with the aid of 3D light detection and ranging after detection of NLOS receptions using a fish‐eye camera was proposed in this study. Finally, the GNSS positioning was improved by using the healthy and corrected NLOS pseudo‐range measurements. The proposed method is evaluated through real road tests in typical highly urbanised canyons of Hong Kong. The evaluation results show that the proposed method can effectively improve the positioning performance.
Feasibility of a kneeling train to improve platform–train interface for passenger boarding and alighting
Authors: Ambur Ramakrishnan , Hubbard Peter , Cooke John , Barnard Simon
Published: April 2020

Railway operators and infrastructure companies strive to optimise the flow of passengers on and off vehicles whilst aiming to minimise accidents at the platform–train interface (PTI). An ideal solution (already available in some situations) would be step‐free access to aid efficient boarding for everyday passengers and those with additional needs or reduced mobility. Out of many solutions existing today, a ‘kneeling vehicle’ seems a possible solution due to the opportunity to minimise the step and gap distances. In this study, the viability of an assumed kneeling mechanism retro‐fitted to a contemporary suspension architecture is assessed by evaluating the possible improvement in the step/gap distances based on a detailed model of suspension movement. It is shown that for many different infrastructure scenarios that significant improvements in the PTI are shown for a modest and achievable kneeling action. This study also addresses fundamental operational concerns of a kneeling vehicle by assessing gauging (with respect to infrastructure and adjacent vehicles) and pantograph interaction.
Cooperative bypassing algorithm for connected and autonomous vehicles in mixed traffic
Authors: Hu Guojing , Wang Feng , Lu Weike , Kwembe Tor A. , Whalin Robert W.
Published: April 2020

Connected and autonomous vehicles (CAVs) have the capability to acquire real‐time information from each other while human‐driven vehicles (HVs) are standalone in the vehicle roadway navigation system. The information asymmetry poses significant challenges in managing and controlling vehicles in mixed traffic. To address such challenges, this study first customises the intelligent driver model to describe the car‐following behaviour of CAVs. Furthermore, to raise the traffic efficiency of the mixed traffic flow, a new lane‐changing decision support algorithm is proposed, which incorporates the interaction between CAVs and HVs by controlling the speed and locating the lane of CAVs. In addition to the common indexes of outflow and travel time to be used to measure the travel efficiency, new parameters such as platoon intensity and single rate are defined to evaluate the CAV platooning capability. Through simulation tests, the proposed controlling framework is implemented for a two‐lane (per direction) freeway segment under different CAV penetration rates and input volumes. The simulation results indicate that, at all the CAV penetration levels, the proposed controlling algorithm provides significant performance improvements to the whole mixed traffic flow in terms of outflow, travel time, and the number of CAV platoons.
Seoul bike trip duration prediction using data mining techniques
Authors: V E Sathishkumar , Park Jangwoo , Cho Yongyun
Published: April 2020

Trip duration is the most fundamental measure in all modes of transportation. Hence, it is crucial to predict the trip‐time precisely for the advancement of Intelligent Transport Systems and traveller information systems. To predict the trip duration, data mining techniques are employed in this study to predict the trip duration of rental bikes in Seoul Bike sharing system. The prediction is carried out with the combination of Seoul Bike data and weather data. The data used include trip duration, trip distance, pickup and dropoff latitude and longitude, temperature, precipitation, wind speed, humidity, solar radiation, snowfall, ground temperature and 1‐hour average dust concentration. Feature engineering is done to extract additional features from the data. Four statistical models are used to predict the trip duration. (a) Linear regression, (b) Gradient boosting machines, (c) k nearest neighbour and (d) Random Forest (RF). Four performance metrics root mean squared error, coefficient of variance, mean absolute error and median absolute error is used to determine the efficiency of the models. In comparison with the other models, the best model RF can explain the variance of 93% in the testing set and 98% (R 2) in the training set. The outcome proves that RF is effective to be employed for the prediction of trip duration.
Miniaturized frequency‐tunable self‐quadruplexing four‐element MIMO antenna system
Authors: Boukarkar Abdelheq , Lin Xian Qi
Published: April 2020

We propose a self‐quadruplexing four‐element multiple‐input‐multiple‐output (MIMO) antenna system with frequency agility. Four separately‐fed orthogonal U‐slots are cut from the same cavity to locate the radiating patches. The frequency tuning is realized by inserting four varactors into the radiating structures. Metalized vias are used for antenna miniaturization and to reduce the coupling between the radiating elements. Also, the antenna exploits the slits realized in its ground plane to further increase the isolation. Truly, the isolation between the elements is enhanced from 8 to 16 dB when they are tuned concurrently. The antenna system has the added merit of tuning each element separately to excite four different operating frequencies exhibiting the self‐quadruplexing function. Measurements reveal that the frequency bands can be tuned together or individually from 4.67 to 5.84 GHz without affecting each other. The measured peak gain and efficiency are 3.73 dBi and 65%, respectively. The proposed MIMO antenna is a promising candidate for communication systems as it is printed on one substrate layer, has a miniaturized size, exhibits good diversity performance with a maximum envelope correlation coefficient of 0.11, and the four elements can be reconfigured separately without the additional quadruplexer circuit.
Review of hierarchical control strategies for DC microgrid
Authors: Abhishek Anand , Ranjan Aashish , Devassy Sachin , Kumar Verma Brijendra , Ram Subhash Kumar , Dhakar Ajeet Kr
Published: April 2020

This work presents an extensive review of hierarchical control strategies that provide effective and robust control for a DC microgrid. DC microgrid is an efficient, scalable and reliable solution for electrification in remote areas and needs a reliable control scheme such as hierarchical control. The hierarchical control strategy is divided into three layers namely primary, secondary and tertiary based on their functionality. In this study, different methods of primary control for current and voltage regulation, secondary control for error‐correction in voltage and current, power sharing in a microgrid and microgrid clusters and tertiary control for power and energy management with a primary focus on minimal power loss and operational cost in a DC microgrid system are reviewed in‐depth. Along with this, the advantages and limitations of various control structures like centralised, decentralised, distributed are discussed in this study. After a comparative study of all control strategies, the optimum control schemes from the author's point of view are also presented.
Solar irradiance resource and forecasting: a comprehensive review
Authors: Kumar Dhivya Sampath , Yagli Gokhan Mert , Kashyap Monika , Srinivasan Dipti
Published: April 2020

With the increase in demand for energy, penetration of alternative sources of energy in the power grid has increased. Photovoltaic (PV) energy is the most common and popular form of energy sources which is widely integrated into the existing grid. As solar energy is intermittent in nature, to ensure uninterrupted and reliable power supply to the prosumers, it is essential to forecast the solar irradiance. Accurate solar forecasting is necessary to facilitate large‐scale modelling and deployment of PV plants without disrupting the quality and reliability of the power grid as well as to manage the power demand and supply. There are various methods to predict the solar irradiance such as numerical weather prediction methods, satellite‐based approaches, cloud‐image based methodologies, data‐driven methods, and sensor‐network based approaches. This study gives an overall review of the different resources and methods used for forecasting solar irradiance in different time horizons and also gives an extensive review of the sensor networks that are used for determining solar irradiance. The various error metrics and accessible data sets available for the sensor networks are also discussed that can be used for validation purposes.
Software tools for tasks of sustainable development of environmental problems: peculiarities of programming and implementation in the specialists’ preparation
Authors: Іatsyshyn Andrii , Іatsyshyn Anna , Artemchuk Volodymyr , Kameneva Iryna , Kovach Valeriia , Popov Oleksandr
Published: April 2020

It is necessary to follow signed documents on development of renewable energy, modernization of fuel and energy sector enterprises and waste management in order to fulfil Ukraine’s commitments to the global community on climate change prevention. Therefore, it is an urgent task to develop software that allows to solve problems of visual analysis of environmental status dynamics of territorial systems and to determine boundaries of individual territories stability. The authors propose new forms of monitoring data presentation of technogenic loadings and risks which reflect dynamics of environmental situation in the space of informative features. It is important to improve skills of professionals, particularly, stuff of the ministries, enterprises and organizations responsible for decision-making to reduce negative impact on environment and to train future professionals in this area. Curriculums of higher education institutions do not pay much attention on usage of software to support managerial decision-making to reduce negative impact on the environment. It is proposed to improve qualification of such specialists, responsible for management in the following areas: conducting training seminars at the ministries, institutions and departments interested in the implementation of developed systems; scientific and methodological support and advisory assistance in the process of implementation of the software; development and improvement of educational and methodological support for postgraduate students and trainees of advanced training, specialists responsible for decision making in energy, environmental and related fields.
Environmental monitoring and recommendations on decreasing the levels of pesticide pollution in Zhytomyr region of Ukraine
Authors: Uvayeva Olena , Vakaliuk Tetiana , Kostromin Dmytro
Published: April 2020

Environmental monitoring was conducted of facilities for storage and disposal of banned and unsuitable pesticides. Pesticide content in the soil, water, and products of agriculture in the Zhytomyr region of Ukraine was examined, and the accumulation of organochlorine pesticides by freshwater bivalve mollusks was assessed. Storage facilities of the Zhytomyr region contain nearly 392.18 t of pesticides in 137 warehouses, of which 11 meet the requirements, 36 are tolerable, and 90 are in poor condition. In 2018–2019, pesticide content (dichlorodiphenyltrichloroethane (DDT), heptachlor, dichlorodiphenyldichloroethylene (DDE), dichlorodiphenyldichloroethane (DDD), hexachlorocyclohexane (HCH)) was studied in soil and sediments in the Zhytomyr region. The content ranged from 0.0007 to 0.07 mg/kg, which is lower than MPC (0.1 mg/kg). The content of HCH, DDT, DDE, DDD, and heptachlor was at 0.0007–0.01 mg/dm3 levels in water bodies of the Zhytomyr region in 2018–2019, also lower than MPC. In some samples of soil, water and vegetables, the recorded levels of DDT and organophosphate pesticides Dragon, Dorpan, and Dursban exceeded MPC in 1.5–3.0 times. Traces of organochlorine pesticide Aldrin were found in soft tissues of bivalve mollusks and in the sediments of water bodies they inhabit. Recommendations are proposed to lower the pesticide content in the environment.
Utilization of mine water of Kryvbas as an imperative for sustainable development of Dnipropetrovsk region
Authors: Amosha Oleksandr , Shevtsova Hanna , Memedlyaev Ziya
Published: April 2020

Sustainable development is a wide area of scientific discourse based on the interdisciplinary approach that integrates research in the natural, technical and social sciences. It is a multidimensional concept that reveals complex interactions between society, economy and environment. This work highlights problems of sustainable development of old industrial regions with the dominance of the mining industry. The latter creates a high human burden on the environment and leads to ecological and social problems. One of the most important tasks of ensuring the long-term environmental sustainability of the Dnipropetrovsk region in Ukraine is utilization of highly mineralized mine water of Kryvbas. From the standpoint of sustainable development, mine water should be considered as a hydro-mineral resource of many valuable components including bromine. In this work we justify the creation of bromine production from mine water of Kryvbas. Potential profitability of the production is largely based on innovative technical and technological solutions. We examine the market and many aspects of the pilot project, including its technological, investment and economic specifics. We highlight the relevance of this project and suggest a possibility for its implementation within the regional strategy framework.
Macronutrients and heavy metals contents in the leaves of trees from the devastated lands at Kryvyi Rih District (Central Ukraine)
Authors: Bielyk Yuliia , Savosko Vasyl , Lykholat Yuriy , Heilmeier Hermann , Grygoryuk Ivan
Published: April 2020

This research was performed at Petrovsky waste rock dump, the Central part of the Kryvyi Rih iron-ore & metallurgical district (Dnipropetrovsk region, Ukraine). The macronutrients (K, Ca, Mg, P and S) and heavy metals (Fe, Mn, Zn, Cu, Pb and Cd) contents in the leaves of three species of the trees (Ash-leaved maple, Silver Birch and Black locust) that were collected on devastated lands were assessed. It was established that trees which grow on the Petrovsky dump take place under evident shortage of nutrients (especially K and P) and excess of metals (especially Fe, Mn and Zn). It is revealed that Ash-leaved maple and Black locust are more resistant to the geochemical conditions of devastated lands. In this regard, these species of trees can be recommended for forest restoration & reforestation on devastated lands.
Geographical analysis of ecology-dependent diseases of Kryvyi Rih population in order to provide a sustainable development of the industrial regions
Authors: Shiyan Daria , Ostapchuk Iryna , Lakomova Olena
Published: April 2020

The geographical, ecological and territorial peculiarities of the dynamics and the appearance’s reasons of the population’s sick rate in dependence on the environment’s state of Kryvyi Rih town with the aim of the stable development’s provision of the industrial regions. The influence of the contamination’s sources on the health state of the Kryvyi Rih population is cleared up and the space-time peculiarities of the sick rate’s display are established: the influence of the environmental risks’ factors on the population’s sick rate and the display of the diseases’ separate groups are defined, estimated and mapped, the spreading’s indicators of the ecologically dependent pathology from the distance to the stationary sources of pollution and from the factors of the environmental risks are revealed. The statistical base is created and the factors’ analysis of the environmental risks, the sick rate, the main demographical indicators of Kryvyi Rih population for the period of 2004 – 2019 is made and it’s determined that the sick rate and the mortality, caused by it, play the essential role in the development of the demographical situation of Kryvyi Rih town.
Infrared spectroscopy as the method for evaluating technological properties of minerals and their behavior in technological processes
Authors: Kholoshyn Ihor , Panteleeva Natalia , Trunin Oleksandr , Burman Liudmyla , Kalinichenko Olga
Published: April 2020

Infrared spectroscopy (IR) is a highly effective method for the analysis of minerals, rocks and ores, capable of solving a whole range of problems when choosing innovative solutions for the technological processing of various types of mineral raw materials. The article considers the main directions of using the infrared spectroscopy method in assessing the technological properties of minerals and their behavior in technological processes: evaluation of the grade (quality) of mineral raw materials; analysis of the behavior of minerals in the technological process with prediction of their technological properties; analysis of changes in the structure and properties of minerals in technological processes; operational analysis of mineral substances at various stages of technological processing. The article illustrates all aspects of the use of infrared spectroscopy at various stages of studying the material composition of mineral raw materials in its enrichment assessment by specific examples of solving problems arising from the technological redistribution of various types of ore and non-metallic minerals.
Determination of the transfer step of the ore chute while mining the technogenic deposit of the bulk type
Authors: Peregudov Volodymyr , Hryhoriev Ihor , Joukov Serhii , Hryhoriev Yulian
Published: April 2020

Further development of the open mining works on the domestic enterprises will be accompanied by the worsening of mining-geological conditions and declining of the quality of iron ore raw materials. In the same time, the accumulated mining wastes, that can make the technogenic deposits, pass into one of the important sources of the mineral raw materials. Taking into account this thing, the development and implementation of the modern technological circuits of the technogenic deposit development is an actual calling for mining industry, and determination and optimization of process conditions of the technogenic deposit development – is the scientific task of this publication. The obtained results of studies of the optimum step value of the ore chute transfer during the technogenic deposit development can be used by design organizations and mining enterprises for designing works. The obtained methodology and the proposed mathematical dependencies will reduce the cost of mining of the technogenic deposit due to the reasonable timely transfer of the open ore chute.
Research of new methods for quality air control after massive explosions in the open mine industry
Authors: Shvaher Natalya , Komisarenko Tatyana
Published: April 2020

The aim of this study is to analyze the existing methods to determine the presence of harmful substances in the open pit atmosphere after massive explosions, and to develop a method of measuring the gas composition of the atmosphere using unmanned aerial vehicle (UAV). Existing methods of controlling the whole open pit atmosphere and its individual sections do not meet safety requirements. The main disadvantages are that workers should be present at danger zone and they are exposed at risk of poisoning by harmful gases. In addition, these methods require considerable time for delivery and analysis of samples in the laboratory, and the results contain significant measurement errors. Therefore, it is necessary to develop a methodology to determine the presence of harmful substances in the open pit atmosphere after massive explosions using UAV device, and conduct analytical research of signal dissemination to UAV control in the air. It was established that the implementation of the proposed method will allow to get quickly reliable data on the chemical composition of atmosphere in the explosion areas. It is possible to carry out the control measurements during mining operations without their interruption and without people presence in the dangerous area which allows to increase safety.
Online ore monitoring using EDXRF method on process conveyor belts at Kazakhmys Corporation LLC operations
Authors: Oliinyk Tetiana , Yefimenko Sergey , Abdrakhmanova Zaure , Kan Andrey , Issatayeva Farida
Published: April 2020

The paper discusses organizing online ore monitoring on process conveyor belts at the operations of Kazakhmys Corporation LLC using EDXRF method implemented as an ore-controlling station (OCS) targeting ore size of -300 mm. OCS is supposed to achieve the objective of providing reliable silver detection measurements in the range of 1+ ppm. Objects of monitoring: copper-containing polymetallic ores delivered to Zhezkazgan, Balkhash and Karagaily processing plants for treatment (target elements include copper, zinc, lead, silver, cadmium, and iron) as well as ores transported by the main underground feeder belt at Nurkazgan Mine (copper, zinc, lead, silver, molybdenum, and iron). The ultimate of the studies was to produce an online report on quality and quantities of ore and metals delivered from each of ore suppliers; to adjust the tonnages dispatched by the various shafts and open pits in the online mode; obtain reliable proof for unbiased redistribution of metals back to the mining operations. Equipment used during the studies: EDXRF OCS RLP21T. Key features of the unit are also discussed. The results of bench-scale testing as well as industrial application of OCS RLP-21T are discussed leading to the conclusion of successful online monitoring of silver in ores sized from +1 ppm to -300 mm. The photographs were provided by S. A. Yefimenko.
Performance of NiO/YSZ anode-supported solid oxide fuel cell fueled with landfill gas stream
Authors: Yaman Cevat , Kucukaga Yusuf
Published: April 2020

Generating electrical energy from landfill gas (LFG) is a challenge due to its low conversion efficiency. In this study, performance of a NiO/yttria-stabilized zirconia (NiO-YSZ) anode-supported cell operating with LFG feed stream was evaluated. This study investigated the potential of solid oxide fuel cells (SOFC) to produce electricity from LFG generated in pilot scale anaerobic municipal solid waste bioreactors. During the initial experiments, power generation was achieved in the SOFC with direct feeding of the LFG. Different feed flow rates (10 25 mL/min) and varying temperature conditions (700 800 °C) were also investigated to define the optimal conditions. Experiments were carried out at different feed rates and the successful results obtained from 10 mL/min and 20 mL/min feed speeds. It was also observed that the maximal power values were between 0.10 0.11 Watt/cm2 for all experiments. This study showed that SOFCs can provide significantly higher energy efficiencies than steam engines for LFG conversion into electrical energy.
Research of algorithms of Data Mining
Authors: Levkivskyi Vitalii , Lobanchykova Nadiia , Marchuk Dmytro
Published: April 2020

The article explores data mining algorithms, which based on rules and calculations, that allow us to create a model that analyzes the data provided by searching for specific patterns and trends. The purpose of this work is to analyze correlation-regression algorithms on a statistical dataset of chronic diseases. Data mining allows building many models, multiple algorithms can be used within a single solution. The article explores the algorithms of clustering, correlation analysis, Naive Bayes algorithm for obtaining different views of data. Since diabetes is one of the most dangerous chronic diseases, the pathogenesis of which is a lack of insulin in the human body, which causes metabolic disorders and pathological changes in various organs and tissues. As a result, it leads to disability of all functional systems of the body. It was decided to investigate the data related to this disease. Also, the quality of the developed methods of information retrieval from the dataset was evaluated and the most informative features were identified. The developed methods were implemented in the system of intellectual data processing. Past studies show promise of using data mining methods to improve the quality of patient care.
Stability of orthotropic plates
Authors: Surianinov Mykola , Lazarieva Dina , Kurhan Iryna
Published: April 2020

The solution to the problem of the stability of a rectangular orthotropic plate is described by the numerical-analytical method of boundary elements. As is known, the basis of this method is the analytical construction of the fundamental system of solutions and Green’s functions for the differential equation (or their system) for the problem under consideration. To account for certain boundary conditions, or contact conditions between the individual elements of the system, a small system of linear algebraic equations is compiled, which is then solved numerically. It is shown that four combinations of the roots of the characteristic equation corresponding to the differential equation of the problem are possible, which leads to the need to determine sixty-four analytical expressions of fundamental functions. The matrix of fundamental functions, which is the basis of the transcendental stability equation, is very sparse, which significantly improves the stability of numerical operations and ensures high accuracy of the results. An analysis of the numerical results obtained by the author’s method shows very good convergence with the results of finite element analysis. For both variants of the boundary conditions, the discrepancy for the corresponding critical loads is almost the same, and increases slightly with increasing critical load. Moreover, this discrepancy does not exceed one percent. It is noted that under both variants of the boundary conditions, the critical loads calculated by the boundary element method are less than in the finite element calculations. The obtained transcendental stability equation allows to determine critical forces both by the static method and by the dynamic one. From this equation it is possible to obtain a spectrum of critical forces for a fixed number of half-waves in the direction of one of the coordinate axes. The proposed approach allows us to obtain a solution to the stability problem of an orthotropic plate under any homogeneous and inhomogeneous boundary conditions.
Dynamic load modelling for tank containers with the frame of circle pipes and structurally improved fittings
Authors: Fomin Oleksij , Vatulia Glib , Lovska Alyona
Published: April 2020

Higher efficiency of bulked cargo transportation along international transport corridors can be achieved with a resource-saving tank container described in the study. A characteristic feature of a tank container is the use of circle pipes as the carrying elements of the frame. In order to decrease impact loads between fittings of the tank container and fitting stops of the flat wagon at shunting impacts, the authors suggest filling fittings with viscous or viscoelastic materials of dumping or anticorrosive properties. The study also deals with modelling dynamic loading for the suggested tank container. The accelerations obtained were considered in strength calculations for a tank container as components of the dynamic loading. It was determined that the maximum equivalent loads did not exceed the admissible loads. The research will promote designing new-generation tank containers of improved technical, economical and ecological properties, and improve the working efficiency of combined transportation.
Sustainable development and harmonization of the architectural environment of cities
Authors: Shebek Nadiia , Timokhin Viktor , Tretiak Yuliia , Kolmakov Ievgenii , Olkhovets Oleksandr
Published: April 2020

The article emphasized the necessity of preserving spiritual values in the process of sustainable development of cities and urban communities. The article considered harmonization of the architectural environment as the ultimate goal and the defining condition for sustainable development of settlements. Basing on the principles of urban synergetics proposed to use internal reserves as well as the selforganization potential of the population and urban planning effectively redistributes resources and reserves. The article deals with the main provisions of the architectural environment harmonization theory with the consideration of different ideas of harmony, the importance of achieving correspondence between a person’s world-view and his surroundings, the expediency of taking into account interpersonal interactions between members of society. The strategic directions of penitentiary environment improvement at all organizational levels outlined. It proposed to form multi-level public spaces for recreation and communication of residents in the centers of historical cities where there is not enough free space. The ways to use recycled materials products for the buildings and structures construction, urban areas improvement, equipment manufacturing were been outlined.
About new aspects of the development of the market of mini apartments in Ukraine
Authors: Kobzan Sergiy , Nesterenko Sergiy
Published: April 2020

The article discusses the issues of a new segment of the real estate market in urban development projects. The analysis of the world market of mini apartments is made. The questions of residence of various social groups in mini apartments are raised. The classification of mini apartments has been developed. The factors significantly affecting the cost of a mini apartment are investigated. The calculation of the analysis of benefits and costs for a mini apartment. Conclusions are drawn about the mini-apartment market in urban development. The research of mini-apartments’ market reflects changes in the development of the whole urban infrastructure. The market of mini-apartments influences on the real estate region’s market. The distinctive characteristics of mini-apartments in different regions are based on their classification. The mini-apartments’ market in different regions is analyzed. The authors constructed GIS-map. GIS analysis shows the dependence of the cost of mini apartments from the region of Ukraine. Calculation of the profitability of mini apartments was carried out using the method of market extraction (market sampling). Using the method of market extraction (market sampling), the income from mini apartments was calculated. Cost benefit analysis shows the aspects of the mini apartments’ market for the urban development.
The content of training program for the teaching staff working with children of the labour migrants (in the context of sustainable futures)
Authors: Trubavina Iryna , Martyniuk Anna
Published: April 2020

The article deals with the ways of overcoming extreme poverty, poorness, starvation by providing quality education and well-being for labour migrants’ children. These problems can be solved via teaching staff’s work. The purpose of the article is to substantiate the content of the educational program for professional development of teaching staff to work with labour migrants’ children and their social environment. Methods of research: theoretical analysis, synthesis, modeling, systematization, generalization. The results of the study: a set of approaches to the content of the program development; the content of the program; recommendations for its teaching. The conclusions of the study prove: labour migrants’ children have problems that can be solved by interaction of teachers, social workers with the children’s social environment; a new program for teachers is required; a set of scientific approaches is the basis for updating the content of the program; the educational program of pedagogical staff consists of the modules: “Problems of labour migrants’ children”; “The system of GSEE work with labour migrants’ children”; “Methods of GSEE work with labour migrants’ children”. The criterion of the effectiveness of the program and its purpose is the professional readiness of pedagogical staff to work with labor migrants’ children.
Sustained English lingua-cultural education: a solution for Ukraine
Authors: Tarnopolsky Oleg , Volkova Nataliia , Kozhushko Svitlana
Published: April 2020

Ukraine, as a state striving to join on the parity basis the international community of developed and democratic countries, lacks some important prerequisites for achieving this goal. Besides several economic and political factors making obstacles for the desired achievement, of no lesser importance are the humanitarian factors, such as the monolingualism and monoculturalism of a substantial part of Ukrainian population. They preclude unimpeded mutual understanding and mutual acceptance, as well as free unimpeded contacts, between many Ukrainian citizens and their European counterparts. In this aspect, the solution for Ukraine can be found in sustained foreign language lingua-cultural education of the broadest strata of Ukrainian population that could open for the people a way out in what concerns their ability to communicate freely and fluently all through the Western European space sharing with the people living there not only the language of international communication but also the cultural approaches and beliefs. The article discusses the ways of developing such sustained (life-long) English lingua-cultural education for the young generation of new Ukraine. It analyzes the section of that education to be implemented at Ukrainian nonlinguistic tertiary schools with the aim of designing its efficient model.
Developing English presentation skills as a component of collaboration competence for sustainable development
Authors: Zaitseva Nataliia
Published: April 2020

The paper deals with the problem of teaching non-linguistics students English presenting as a component skill of collaboration competence. Students’ considerable reluctance to take up this type of creative activity and to present their ideas in front of their colleagues is a serious obstacle to develop their communicative abilities necessary for prospective leaders of the 21st century in science and industry. The results of the survey of Machine Building and Computer Science students as to reasons for their disinclination to create presentations are presented. The strategy for overcoming students’ unwillingness and building their presenting confidence are given. The example of implementation of a task for strategic thinking for sustainable development within the discipline ‘English as a foreign language’ is given. The aspects and stages of effective online presentation editor application for teaching English presenting are analysed. The results of students’ choice of five presentation tools are included. Three prospective online presentation makers are analysed and their utility for creating and giving English presentations are studied. It is stated that the most promising online tool is Prezi since it offers prepared professional quality features and incites developing and incorporating personal creative ideas through bright and uncommon visual means.
Formation of practical skills modeling and printing of three-dimensional objects in the process of professional training of IT specialists
Authors: Hevko Ihor , Potapchuk Olha , Sіtkar Taras , Lutsyk Iryna , Koliasa Pavlo
Published: April 2020

The article discusses the current technology of three-dimensional modeling and prospects for its implementation in the structure of the modern system of professional training of IT specialists according to the concepts of sustainable development. The problems have been actualized and the methodology for three-dimensional modeling and printing has been proposed by using modern software, in particular, the features of using the basic core of geometric design and software preparation of the model for printing have been presented. An algorithm for the formation of practical skills of students in hardware preparation and calibration of 3D printers, the adjustment of the main technological parameters of work, preparation for the manufacture of a spatial model has been proposed. The developed algorithm promotes to the formation of practical skills of modeling and printing three-dimensional objects in future IT-specialists of vocational education, contributes to the formation of their professional competencies. In turn, this contributes to the formation of professional competencies among future IT specialists and creates the need for systematic improvement of knowledge and their creative implementation in practice with a more efficient use of IT technologies, which is the basis in solving the problems of sustainable development of society.