bluuebunny/crossref_metadata_2025 huggingface dataset:
Harmonic Source Region Location Based on Fast ICA and Scene Clustering
Authors: Xu Haobo , Shao Zhenguo , Chen Feixiong
Published: November 2020

The widespread application of power electronic devices and renewable power generation has resulted in significant harmonic pollution. Harmonic source location is of great importance since it is a prerequisite to mitigate harmonic pollution. In this paper, a scene-based harmonic source region location method is proposed. The proposed method employs the fast independent component analysis (ICA) to locate the harmonic source region as the harmonic measurement matrix is unknown and the measuring equation is not observable. In this way, the range of suspect harmonic sources is narrowed and the cost of harmonic source location is reduced. Furthermore, the improved K-means algorithm is adopted to divide the measurement data into several scenes to improve location accuracy. Finally, a case study is conducted to verify the validity and accuracy of the proposed method.
Time-domain simulation analysis of combined suppression measures for subsynchronous oscillators
Authors: Wenpei Zhu , Aimin An , Yifan Xu , Wei Chen , Yingying Zhao
Published: November 2020

Subsynchronous oscillation (SSO) may occur in High Voltage Direct Current (HVDC) transmission systems during operation. It seriously affects the stability of the power system, and, if no reasonable control measures are taken, the shaft system of the unit can break. To study the AC side shafting of an HVDC system, the parameters of the first IEEE standard model of SSO were taken as the reference and combined with the CIGRE Benchmark two-terminal DC transmission model to build a complete set of HVDC systems for SSO research. The system SSO phenomenon was realized by setting the fault of a Supplementary Subsynchronous Damping Controller with wideband connection and a Supplementary Excitation Damping Controller with separate modes. They were designed at the network side to suppress the SSO of the system effectively, and the effectiveness of the suppression effect was verified by time-domain simulation.
Multi-objective fuzzy optimization model of power system dynamic environment economy based on coordinated dispatching of wind power and electric vehicles
Authors: Liu ShuTing , Li ShouQiang , Xun Jian , Quan ZhenJia , Zhao Chen , Wu FeiHong
Published: November 2020

In order to coordinate the impact of the integration of electric vehicles and wind power on the economic dispatch of power systems, a multi-objective dispatch model for the environmental economy of wind farms with PHEVs connected to the grid was constructed. The uncertain factors of wind power generation and load will increase the difficulty of dispatching. The fuzzy theory will be used to realize the fuzzy modelling of the coordinated connection of wind power and electric vehicles. The satisfaction index will be used to transform the multi-objective problems of deterministic environment and economy into single For the objective optimization problem, based on the improvement of the traditional particle swarm optimization algorithm using linear descent search ideas and the particle information sharing method considering boundary constraints, the improved PSO algorithm is used to solve the proposed dynamic environment and economic dispatch model. From the grid operation and vehicle owners from the perspective of demand, the constraints of the system’s rotation reserve and the daily travel of the owner are considered. The comparison and analysis of the simulation of algorithms and calculation examples and multiple scheduling schemes in different scenarios verify the rationality of the model and the superiority of the improved PSO algorithm for solving such dynamic scheduling problems.
Analysis of Distributed Power Access on Distribution Network Fault Location and Voltage Quality
Authors: Li Bohan , Xu Chang , Huang Ping , Zheng Fangqin , Jiang Dan , Wang Jing
Published: November 2020

Distributed Generation (DG) has a certain impact on distribution network fault location and voltage quality during the access process, which is worth studying. In this paper, the impact of distributed power on the two is discussed separately, and further technical analysis is carried out with an example.
Design of elevator control system based on DE10-Nano board
Authors: Tao Yunxuan , Xie Yan , Zhang Xiangwu , Zou Qingrui , Yang Wenzhou
Published: November 2020

In today’s society, the elevator has become an indispensable tool in people’s production and life. Due to the obvious advantages of FPGA in digital circuit control system, the control based on FPGA has become one of the most widely used control methods of elevator. DE10-Nano board provides a powerful hardware design platform based on Intel system on chip (SoC) FPGA, which can flexibly and conveniently complete the elevator control function. In this paper, based on DE10-Nano board, the function analysis and design of elevator control system are completed, and the effectiveness of the control system function is verified through time sequence simulation.
Research on Optimal Load Scheduling for Multiple Scenarios
Authors: Ding Yifan , Huo Molin , Jiang Haiyan , Ma Yahui , Chen Aikang
Published: November 2020

In recent years, the operation of power grid is under great pressure due to more and more distributed resources. This paper establishes three kinds of load models, namely the electric water heater(EWH), the electric vehicle(EV) and the energy storage(ES). The response cost, speed, capacity and duration are taken as the four characteristic elements to cluster the demand side loads. According to the scenario characteristics, the factor weights under different scenarios are determined. Furthermore, the particle swarm optimization (PSO) algorithm utilized to optimize the scheduling of demand-side resources selected by K-medoids clustering algorithm. Simulation results indicate that, by taking advantage of the complementarity of the time-domain and functional characteristics of multiple loads, the consumption needs of different scenarios can be satisfied.
A New Magnetic Coupling Mechanism for Patrol Robot Wireless Charging System
Authors: Xue Tiange , Meng Xiangzhong , Hou Liyang
Published: November 2020

In this paper, a new magnetic coupling mechanism with Double-Layer-Double-D (DLDD) coil and nanocrystalline magnetic core is proposed for patrol robot wireless charging system. In comparison with the traditional magnetic coupling mechanism, the magnetic coupling mechanism proposed in this paper has higher magnetic induction intensity, lower magnetic leakage, higher coupling coefficient and better anti-offset ability. Hence, the efficiency of the wireless charging system can be improved. The organization of this paper is as follows. Firstly, the topological structure of the coil and magnetic core of the new magnetic coupling mechanism are introduced. Then, based on the working principle of the wireless charging system, the influence of the new magnetic coupling mechanism parameters on the transmitted power and efficiency of the wireless charging system is analysed. Moreover, in comparison with the conventional magnetic coupling mechanism, the electromagnetic properties of the two kinds of magnetic coupling mechanism are analysed and compared, including magnetic induction intensity, coupling coefficient and anti-offset ability, etc.
Multi-objective Optimal Scheduling for Improving Renewable Energy Consumption Considering Energy Storage Participation
Authors: Cheng Jiehui , Zhang Huiyuan , Xu Jun , Wang Ziqi
Published: November 2020

In response to global environmental crisis and energy exhaustion, the renewable energy resources represented by solar and wind energy have been rapidly developed. In order to make full use of the dispatch resources within the regional power grid, the multi-objective optimal scheduling for improving renewable energy consumption considering energy storage participation is studied. Firstly, the charging and discharging state of the multi-point arrangement of energy storage device are judged according to the source and load status of regional power gird. Secondly, considering the operation constraints of the actual system, taking the total operation cost and network loss of regional power gird as the objective functions, the improved multi-objective search algorithm based on particle swarm optimization algorithm is used to solve the model. Finally, the actual power grid in Xinjiang of China is used as an example for simulation calculations. The simulation results show that the proposed multi-objective optimal scheduling method can significantly improve the system economy, suppress the fluctuation of the upper-level exchange power, and at the same time take into account the renewable energy consumption capacity, which is conducive to the safe and stable operation of the regional power grid.
Interruptible load resource pool optimized scheduling technology for multi-scenario requirements
Authors: Ma Yahui , Guo Lei , Huo Muolin , Ding Yifang , Zhang Zhe
Published: November 2020

This paper firstly discusses the organization form of interruptible load resource pool, and analyzes the economic benefits of demand response and the timeliness of interupptible load. Secondly, under the premise of ensuring safe and stable operation of power grid, a scheduling strategy with dynamic planning in different scenarios is proposed. At last, the effectiveness of the interruptible load resource pool optimal scheduling technology is verified by the scheduling of temperature-controlled loads, electric vehicles (EV) and energy storage(ES) device.
Strength analysis of large motor
Authors: Wang Dongxin
Published: November 2020

Large motors are widely used in industrial production, mainly playing the role of load operation, equipment cooling and so on, and playing a vital role in the corresponding system, whose safety and reliability determine the stability of the entire industrial production. However, as the large motor is a rotating mechanism with a large volume, it will produce a large moment of inertia when it works at high speed. At this time, the structure between the rotor and bearing, the rotor itself, the rotor ventilation slot and other structures need to ensure a certain mechanical strength. This paper takes a 4500kW large motor as the research object, calculates the strength of rotor core and torsional strength by means of strength calculation, and analyzes the distribution of the internal stress field of the motor due to centrifugal force when it is running at high speed through finite element analysis, determines the location of stress concentration and calculates the strength requirements.
Research on the axial force and water film thickness of water-lubricated thrust bearing for mine high speed rescue pump
Authors: Bai Yuxing , Feng Zizheng , Pan Bo , Huang Dan , Fangming WU
Published: November 2020

Due to the limitation of mine well size and the requirement of rapid rescue for flooding, a mine high speed rescue pump with small volume and large head is developed and designed. According to the hydraulic characteristics and structure of rescue pump, the axial force under 6 different speeds and 4 different flow conditions are studied. The water lubricated thrust bearing is designed. The Reynolds equation is solved by finite difference method to solve the minimum thickness of water film under the above conditions. The results show that: the axial force increases with the rise of rotating speed; the smaller the axial force, the larger the water film thickness, the greater the change amplitude of water film thickness. The research work in this paper can provide guidance for the follow-up research of high speed and big power mine rescue pump.
Experimental Study on Integration Bamboo Elastic Modulus whith Three-point Bending Nondestructive Testing Method
Authors: Wei Liuchuang , Wei Ping
Published: November 2020

Integrated bamboo is widely used in daily life and industrial production. This paper explores and studies the determination method of its elastic modulus. In this paper, based on the elastic theory of the member, a three-point bending method is proposed. This method was used to carry out experimental design and experiment, and the results were analyzed and discussed. The conclusion is that the three-point bending method has simple experimental conditions, convenient operation and convenient application in practice.
Wheat stem base diseases and their causal agents
Authors: Bankina Biruta , Bimšteine Gunita , Neusa-Luca Ingrīda , Kaņeps Jānis , Roga Ance , Fridmanis Dāvids
Published: November 2020

Wheat stem base disease is an important disease complex, caused by various pathogens that are characterized by variable life cycles and ecological requirements. Wheat stem bases with symptoms of different stem diseases were collected in 2012-2018. Causal agents and other fungi were identified by mycological and molecular genetic methods. A total of 6787 isolates of fungi were obtained and identified to the genera/species level. Out of the total number of isolates, 50% belonged to causal agents of stem base diseases, 10% were causal agents of leaf spots, and 8% were different saprotrophs. Fungi from the generaFusarium(51%) andOculimacula(35%) were the most dominant causal agents of stem base diseases. An increasing occurrence ofMicrodochium nivaleandM. bolleyi(totally 15%) was noticed. The dominant species ofFusariumwereF. culmorum, F. avenaceumandF. tricinctum;other species were detected only in some cases. An unexpectedly high proportion (31%) of fungi from different ecological niches were isolated from wheat stems with stem base disease symptoms.Phaeosphaeria(most likelyP. pontiformis)was the dominant fungus among non-pathogenic fungi. Further studies are required to clarify the interactions between this fungus, wheat, and causal agents of stem base diseases.
Isolation of extracts of wormwood - effective natural insecticides of the terpenoid group
Authors: Mukovoz Vladimir , Mukovoz Petr , Dolzhenko Viktor , Meshalkin Valeriy
Published: November 2020

Extracts of wormwood (Artemísia absínthium) grown in the greenhouse complex of the Institute of Phytopathology were obtained. The resulting extracts were isolated from the dried ground parts of this plant (leaves and flowering tops) by subsequent extractions with a mixture of dichloroethane, acetone and petroleum ether, as well as a mixture of methanol, chloroform and water with the addition of water and chloroform to separate the chloroform layer and purification on activated carbon. By further separation of the obtained extracts by preparative column chromatography, biologically active fractions with different contents of natural insecticides from the group of terpenoids were isolated. The content of biologically active components in various fractions was determined by the methods of chromatomass-spectrometry. It was found that a mixture of low-polarity chloroform with a minimum amount of polar methanol most fully extracts chrysanthenone and chrysanthenyl acetate, cineole and borneol, and the minimum extraction of terpenoids is observed with an increase in the content of polar methanol in the eluent containing chloroform. The insecticidal effect of the isolated fractions on the large cereal aphid (Sitobion avenae) was studied. It was found that the maximum insecticidal effect (100% death of insects) was exhibited by the fraction of terpenoids isolated during extraction with a low-polarity eluent containing chloroform with a minimum amount of methanol. It was found that the fraction of terpenoids containing a high amount of chamazulene exhibited a moderate insecticidal effect (31% of insect mortality), while fractions with a low content of this compound exhibited low insecticidal activity. It was shown that extracts of wormwood have an insecticidal effect against the pest of cereal crops, large cereal aphid and can be used as environmentally friendly natural insecticidal additives to commercial preparations.
Different Fe(III) and Fe(II) complexes in clonal micropropagation of Gooseberry
Authors: Nikulina Elena , Akimova Svetlana , Tsirulnikova Nina , Kirkach Vadim
Published: November 2020

Iron chlorosis and tissue necrotization are often problems of plant growth in sterile conditions. Therefore, the overall multiplication factor and the productiveness dramatically decrease. The aim of work paper was to study the effect of various forms of iron chelates, including the stable complex of iron (II) with phosphorus-containing organic ligand, 1-hydroxyethylidenediphosphonic acid (HEDP), to the nutrient medium on the development of micro-shoots of Pink-2 (Rosovy-2) gooseberry cultivar according to Quoirin & Lepoivre (QL). Seven types of media were used in the screening: FeS04×7H20 + Na2EDTA (two control variant); Fe-EDTA - a complex of iron with ethylenediaminotetraacetic acid as such; Fe-DTPA (ferric diethylenetriaminepentaacetate), Fe3+ and Fe2+ -HEDP (ferric (III,II) 1-hydroxy ethylidene-1,1-diphosphonate), Fe-EDDHA (ethylenediamine di-2-hydroxyphenyl acetate ferric). The influence of 4 concentration values of concentrations of introduced iron complexes were studied experimentally: reduced (×0.5), standard (×l), increased 1.5-fold (×l.5) and double concentration (×2). Results have shown that form of introduction of iron sources, the valence of the iron ion, the ligand types and their concentrations are important factors in shoot multiplication of gooseberry cultivar ‘Pink-2’.
Assessment of health risks associated with soil contamination by heavy metal in an impact area of Novocherkassk power plant
Authors: Lobzenko Ilia , Konstantinova Elizaveta , Bauer Tatiana , Mandzhieva Saglara , Sushkova Svetlana , Chaplygin Victor , Burachevskaya Marina , Minkina Tatiana , Kravcova Natalia , Kalinichenko Valery
Published: November 2020

Soil contamination with heavy metals (HM) due to emissions of fired power plants poses risks to ecological safety and human wellbeing. Total concentration of Cr, Mn, Ni, Cu, Zn, Cd, and Pb in twelve surface soils (0-20 cm) around the Novocherkassk Power Plant (NPP) was determined using X-ray fluorescence spectrometry. According to the level of non-carcinogenic risk for all age groups, metals form the following series in descending order: Pb> Ni> Mn> Cu> Cd> Zn> Cr. The total risk of general toxic effects of all studied elements for both age groups is assessed as low. The carcinogenic risk due to the combined exposure to Ni, Cd and Pb slightly exceeds the permissible level of 1 × 10−6 in the soils in the immediate vicinity of the plant, but in general, it corresponds to the acceptable level in the study area.
On The Road to Recovery of Organic Waste into a Growth Substrate - Öland Case Study
Authors: Sachpazidou Varvara , Katrantsiotis Christos , Ferrans Laura , Hogland William
Published: November 2020

The CONTRA- Baltic Beach Wrack- Conversion of Nuisance to a Resource and Asset project aims to transform Beach Wrack into a Resource. In collaboration with CONTRA project, the Environmental Science and Engineering Group (ESEG) aims to demonstrate the technological and economic feasibility of using beach wrack raw materials for energy production and bio-based compost as practical approaches towards the circular economy. In the present study, the purpose is to concentrate the nutrients from four different biological materials (beach wrack, sawdust or wood chips, degraded sediments and Coffee powder), through the composting process.
Application of plasma-pyrolytic processing of solid radioactive waste on a floating nuclear power plant
Authors: Polyakov Nikita , Chulkin Sergey
Published: November 2020

During the operation of a floating nuclear thermal power plant (FNPP), in particular the Akademik Lomonosov FNPP, radioactive hazardous waste (RW) is generated. There is no unified infrastructure for RW utilization in the far North of Russia. In this regard, to reduce chemical risks and the cost of ownership of raw materials, it is necessary to create processing complexes at the site of hazardous waste generation. The purpose of this work is to assess the economic efficiency of radioactive waste disposal, environmental safety and operational qualities of the RW plasma-pyrolytic processing unit at the FNPP. As a result of analytical studies, it was found that the economic efficiency of disposal of products processed by the new plant is more than 13 million rubles for 1 cycle of operation of the plant. It is determined that harmful factors affecting a person when working with the plant should be taken into account when designing the location of the plant at a nuclear power plant and means for automating the processing process. The amount of polychlorinated dibenzo-p-dioxins and dibenzofurans in the emissions of the processing plant does not exceed 0.014-0.02 ng/m3 in toxic equivalent (TE), and the elimination of possible accidents at the plant is relatively easy to localize and eliminate.
Baltic Smart Asset Management – data driven predictive maintenance methods for future
Authors: Hogland William , Katrantsiotis Christos , Asim Ibrahim Muhammad
Published: November 2020

This Interreg project Baltic Smart Asset Management focuses on District Heating (DH) studies in the three Baltic countries Lithuania, Poland and Sweden. Some part of the grids in the member countries start to be old and safe, secure and affordable energy supply most be delivered and reduction of CO2 emission is obvious though boilers are fed by gas, oil, coals and solid wasted and renewable energy sources must be used instead. The paper gives some basic information about district heating system and how the countries through a cross-border strategy will create awareness of preventive data driven maintenance methods energy companies based on the educational purpose to decrease harmful emissions to environment. As technological methods has improved greatly in recent years these should be given more consideration as a possible treatment option of DH instead of chemicals which can have Environmental impact in the form of the influence of metals and degradation of habitat, species etc. Involvement of associated partners and stakeholder in the work is of high importance in the project.
Assessment of Russian regions vulnerability to groundwater pollution with pesticides
Authors: Kolupaeva Victoria , Gorbatov Victor , Nuhina Inna
Published: November 2020

The predisposition of the region to groundwater pollution by pesticides depends on climatic and soil factors, characteristics of the aquifer system, the type of the territory management, physicochemical properties of used pesticides and timing of their application. The applying of computer models for vulnerability assessment allows to consider the influence of factors affecting the migration of substances through the soil profile. Agricultural districts of Russia were grouped by basic climatic parameters -average annual temperatures and rainfall. 9 large regions with uniform climatic characteristics were obtained. The combination of climatic and soil parameters of each region made up a standard scenario, which was implemented as input files to the pesticide fate model PEARL. As an indicator of the vulnerability of groundwater to pesticide contamination, we used the predicted weighted average annual pesticide concentrations in leachate at a depth of 1 m. Calculations showed the highest vulnerability was in Nizhny Novgorod, Moscow, Pskov, Vladivostok, intermediate one - in Novosibirsk, and the lowest ones - in Kurgan, Saratov, Kursk and Krasnodar.
Changes in the channel of the section of the Red River flowing through the Hanoi region
Authors: Dinh Tu , Kharlamova Natalia , Ionkina Elena , Nguyen Ha , Krasnoscshekov Victor
Published: November 2020

The article substantiates the need to study the fluctuations of the area of the Red riverbed in the area of the city of Hanoi in certain historical periods. A methodology for studying the river, including methods of remote sensing of the Earth (remote sensing) and Geographic Information System (GIS), is proposed. It is established that during each historical period, the riverbed changes in the direction of a gradual balance of bends, erosion of the banks and growth between the two banks. The influence of climate change on spatial changes in the riverbed was analyzed using a superimposed map and ceilings. Explosive fluctuations in the area of the riverbed were detected during periods of peak floods and greatest droughts. The results of the research that formed the basis for building a spatial security corridor and planning operational and environmental solutions on both banks of the river are presented.
The efficiency of the on-grid solar power plant in the Chechen Republic
Authors: Salamov Islam , Bobyl Alexander , Mekhilef Saad
Published: November 2020

The paper presents the analysis’ results of the generation and economic efficiency of a solar power station functioning in the private sector in conjunction with a centralized power grid. Based on data analysis of the generation of a test solar power plant with a capacity of 1.86 kW, a comparative analysis of the calculated and actual characteristics in real functioning conditions is carried out. The estimated power generation capacity of the station during 5 months (December 2019 - April 2020) was 680.1 kWh, and the actual generation for the same period was 525.86 kWh. Using data on the solar radiation’s level on the Chechen Republic territory, as well as data on electricity tariffs in the region, the economic effect of using a grid solar power plant is predicted. Taking into account the electricity tariff for private consumers, the estimated payback period of the system was 25 years. At a rate for commercial consumers - 12 years. Based on the analysis, it was concluded that the use of grid solar power plants is economically feasible only for electricity consumers in the Chechen Republic who purchase electricity at a commercial rate.
Some features of selection conditions and manufacturing technology for highly efficient thin-film solar cells based on Si
Authors: Olimov Shoirbek , Chen Noufu , Kasimakhunova Anarkhan
Published: November 2020

The main objective of this study is to find the most advanced production technology for semi-voltaic energy converters. The paper presents the results of analysis, production and research of solar cells that have a thin film intersection on Si p- type. The authors also carried out technical analysis of manufacturing and study of heterostructured solar cells of thin layers of crystalline and amorphous silicon. The basic requirements for the production of the most effective light barriers discussed.
The study of the ashes obtained by burning the dry sludge of urban sewage treatment systems
Authors: Cheremisin Alexey , Davydov Roman , Meshalkin Valeriy , Zhuchenko Alexander , Savchenko Ivan , Popovskiy Nikita
Published: November 2020

Currently, the problem of processing various wastes for their further use, such as, for example, sewage sludge, is of considerable interest. The processing itself takes place by burning the sludge to obtain ash, the use of which may further require its additional cleaning from heavy metals. The proposed approach to assessing the composition of ash using a Fourier-transformed infrared spectrometer, express control devices based on NMR and an X-ray spectrometer allows us to qualitatively assess the composition of ash and make informed decisions about its further use, storage and processing.
On possibility of controlling the flow rate and state of wastewater using nuclear magnetic flowmeter-relaxometer
Authors: Myazin Nikita , Dudkin Valentin , Kosolapov Vladimir , Switala Franciszek , Makeev Sergey
Published: November 2020

Currently, one of the urgent tasks in environmental monitoring is monitoring the wastewater state. Wastewater is generated in any technological production, as well as in agriculture as a by-product of production. These wastewaters must be cleaned of hazardous elements before being discharged. Moreover, their condition control is necessary even if the water cycle is closed, i.e. there is reuse after treatment. It should be noted that such wastewater can contain pollution and other production waste which can cause damage to the measuring equipment. In this case, non-contact devices are preferable for wastewater control. The method of nuclear magnetic resonance is one of the promising solutions to this problem. The developed device allows measuring water flow at a flow rate in the range from 0.001 to 1.0 liters per second. In this range, relaxation constants are measured to determine the presence of both dissolved and undissolved impurities, as well as hazardous substances in water. Measurements can be made in the temperature range from 276 to 320 K. All measurements are carried out without contact with the investigated medium. Our work presents the results of such measurements.
Determining the location of an object during environmental monitoring in conditions of limited possibilities for the use of satellite positioning
Authors: Nikolaev Denis , Chetiy Vladimir , Dudkin Valentin , Davydov Vadim
Published: November 2020

The article is devoted to the problem of determining the location of an object in space within the framework of various tasks of monitoring the state of the environment, in conditions of inaccessibility of traditional satellite positioning. As part of the task of monitoring the state of the environment, monitoring agricultural territories and observing the atmosphere, the use of traditional satellite navigation systems in many cases is not available. To solve it, it is proposed to use passive methods for determining the location of the object. To increase their reliability in solving environmental monitoring problems, a new algorithm was developed for the difference-ranging method by increasing the number of used differences of arrival times. The difference between the signal arrival times may be less than 0.02 us. Using the algorithm allowed to abandon the use of the reference station and move on to differences in arrival times between all pairs of stations. In this case, the accuracy of determining the position of the object increases by 20 - 45%. The error in determining the position of the object does not exceed 1 m. This value allows the operational search of weather balloons and other equipment for environmental monitoring.
Changes in soil prokaryotic community structure following pesticide additions to agrosoddy-podzolic soil
Authors: Astaykina Angelika , Streletskii Rostislav , Gorbatov Victor
Published: November 2020

The microbial community is an essential component of the soil ecosystem. The application of mineral fertilizers and pesticides leads to taxonomic and functional rearrangements in the structure of the prokaryotic soil community. Compared with classical cultivation methods, molecular genetic techniques of analysis make it possible to estimate the extent of these changes with a given accuracy. The aim of the work was to study the effect of three pesticides on the structure of the prokaryotic community of agrosoddy-podzolic soil using DNA metabarcoding and metagenomics. With the joint application of three pesticides, the dominance of representatives of the phylogenetic group Proteobacteria is observed in the soil microbial community. When the herbicide of metribuzin is applied to the soil at a 10-fold rate, the proportion of bacteria Flavisolibacter ginsengisoli increases. It was found that when the herbicide, insecticide and fungicide are applied individually, the bacteria are reduced in the number of Mycobacterium madagascariense and Candidatus Nitrocosmicus bacteria. In all variants of the experiment, when pesticides were added, both in the recommended application rate and in the 10-fold rate, an increase in the presence of bacteria Sphingomonas parvus was observed. This indicates a high hydrolytic activity of these bacteria. The established fact can be used in further experiments on the pesticide biodegradation and on the remediation of contaminated areas.
Monitoring complex for concentrator photovoltaic installation with a tracking system
Authors: Shvarts Maxim , Larionov Valery , Pokrovskiy Pavel , Sadchikov Nikolay , Malevskiy Dmitriy
Published: November 2020

The concentrator photovoltaic modules efficiency and their power generation are strongly dependent on the accuracy of their orientation by a tracking system towards the Sun. The more the solar cell power concentration ratio, the more stringent requirements are imposed on the module’s guidance system and tracking accuracy in the direction of the Sun. Effectiveness of the proposed technical solutions for the pair “module – tracking system” is usually verified as a result of the photovoltaic installation continuous monitoring. Such solutions for the specialized complex are presented, which provide for both control over the operating modes of the turning system used for the modules orientation to the Sun and tracking accuracy continuous monitoring, as well as regular monitoring of the modules output parameters in a photovoltaic installation.
Problems of organization sustainable channels for international environmental cooperation in terms of new challenges on the example of the Baltic region
Authors: Asadov Babek , Asadov Eldar
Published: November 2020

The presence of existing potential sources of threat and the emergence of new problem areas inevitably retains the priority of the environmental factor as one of the key foundations for the formation of an approach to regional development. Today, the growing anthropogenic load on the environment makes it inevitable to renew the agenda of international cooperation and harmonize international environmental relations. The authors pay attention to certain aspects of environmental cooperation on the example of the Baltic region, where both the most effective practice of interaction between the countries of the region has been formed, and there are issues of environmental uncertainty. The problem areas have been identified that require not only expanding the boundaries of the application of a responsible environmental policy, but, taking into account dynamic processes and their expected consequences, to find the most acceptable solutions that meet the needs of the region’s countries in ensuring environmental safety.
The development of environmental competence of students through the implementation of the project “Plant wealth of Russia: from region to region”
Authors: Belyakov Nikolay , Nikolina Nadezhda , Belyakova Polina
Published: November 2020

The authors present the main stages and results of the project “Plant wealth of Russia: from region to region”. Project goal is the development of environmental competence and the overall environmental culture of students of educational organizations. The project is focused on the study of the practical application, conservation and protection of plants in the regions of Russia. The project consists of three stages: the project at the local level called “Plant resources of the region’s ecosystem as the main source of healthy nutrition”; regional forum called “Life in the Ecostyle” and all-Russian festival “Plant “ornament” of Russia”. At the end of the festival, a model of the Plant “ornament” of Russia was presented depicting the diversity of plant resources of the participating regions of the festival. Each stage of the project is designed to expand the target audience. In the future, authors plan to implement the project in the format of all-Russian festivals in different regions.
Emulsifiers for reducing viscosity of highly viscous oil from Tahe 10 oilfield
Authors: Sun Xiangyu , Liu Lei , Ge Jijiang
Published: November 2020

The viscosity of original heavy oil increases with the decrease of temperature in the process of wellbore lifting, which makes it more difficult to lift the wellbore for Tahe 10 area reservoir, so emulsification and viscosity reduction technology is studied. The carboxymethyl polyoxyethylene alkyl alcohol ether surfactant containing different oxyethylene chains is an emulsifier with excellent tolerance of high temperature and salt. The researches indicate the compounded system of OPC-20 and DSB at 4:6 can significantly improve the solubility of OPC-20 in high-temperature brine, and it also has a good emulsification performance for Tahe heavy oil.
Analysis of the Impact of Energy Consumption on Economic Growth in Guangdong Province
Authors: Zhang Caihua , Tan Tongxin
Published: November 2020

In view of the importance of energy consumption in economic development, as well as the emergence of energy shortage, high energy consumption, ecological environment damage and other issues in the process of economic development, the relationship between energy consumption and economic growth has attracted the attention of scholars. After analyzing the current situation of economic development and energy consumption in Guangdong Province, this paper selects the corresponding variable indicators, carries out co-integration analysis and Granger causality test, further constructs VAR model to proceed with impulse response analysis, studies the relationship between energy consumption and economic growth, and puts forward the relevant countermeasures and suggestions in accordance with the results of empirical analysis.
Connotation and Benefit Evaluation on Integrated Energy System of Urban Agglomeration
Authors: Tan Xue , Zhao Qiuli , Tian Xin , Wang Yue , Jiang Shurui
Published: November 2020

With the development of ecological civilization construction and regional coordinated development strategy in China, to adapt to the development trend of urban agglomeration, the energy structure will be adjusted and upgraded accordingly. The energy structure has gradually changed from fossil energy to diversified supply mode. The integrated energy system of urban agglomeration will coordinate with energy planning, operation, management and other links, and realize the linkage and complementarity of multiple energy sources. In this context, it is necessary to carry out a systematic analysis of the comprehensive energy system of urban agglomerations. This paper analyzes the connotation, characteristics and function mechanism of comprehensive energy system of urban agglomeration, and constructs a set of evaluation index system. These research ideas and methods can be applied to the scenarios of energy development, utilization and management that adapt to the development of urban agglomeration, and provide scientific analysis tools for energy system management and evaluation.
A brief review on the moisture stability for perovskite solar cells
Authors: Xu Hongming
Published: November 2020

Perovskite solar cells have attracted lots of attention in recent years with the power conversion efficiency increasing from an initial value of 3.8% up to 25.2%. However, its large-scale commercialization still faces various challenges, among which stability issue is the key to this process. Herein, we briefly reviewed the mechanism of perovskite material deterioration in the influence of water erosion as well as several effective strategies reported in recent years to improve the wet stability of perovskite solar cells, such as the composition engineering, surface passivation, dimensional design, etc.
Application of Polymeric microspheres in extra low permeability reservoir in Huabei Oilfield
Authors: Lei Xiaoyang , Zhao Shuhua , Fu Yaxiu , Gu Yujie , Su Huanzhong , Tang Yajuan
Published: November 2020

Aiming at the problems of low water displacement recovery effect in extra low permeability reservoir of Fault-block B10 in Huabei oilfield, the oil recovery technique of surfactant flooding under polymeric microspheres was proposed in this paper. According to the features of polymeric microspheres deep profile control technique, expansion, plugging capacity and migration ability of two samples were evaluated. On the basis of these, a polymeric microspheres matched with the B10 reservoir was selected and tested in the field. Field application indicated that average pressure elevation of each well was up to 4 MPa, corresponding wells efficiency were 88%, comprehensive water was decreased by 6.6% and cumulative incremental oil production was 3350t.

Fault block B10 in Huabei Oilfield had an average porosity of 17.6% and an average permeability of 3.5×10−3μm2. It belonged to a low porosity ultra-low permeability reservoir. The surface crude oil viscosity was 90mPa.s, which belonged to ordinary heavy oil reservoir. Many years of water injection had formed a fixed water flow channel in the formation. The water injection wave and volume were not balanced, and the problem of inefficient or ineffective water injection circulation was becoming more and more prominent. At present, the comprehensive water cut had reached 90%. After surfactant flooding in some well groups, due to the serious heterogeneity of reservoir, displacement fingering was obvious and the implementation effect was poor. As a new type of deep profile control and flooding agent, polymer microspheres can form step-by-step plugging after entering the low-permeability reservoir, and greatly adjust the water flooding flow field and expand the sweep volume [1]. In order to explore the adaptability of polymer microsphere to B10 reservoir, a polymer microsphere suitable for B10 reservoir was selected by static expansion of microsphere and dynamic physical model plugging experiment of core. Field application showed that the polymer microsphere had good adaptability in B10 fault block.
Research on Evaluation System of World-Class Energy Internet Enterprises
Authors: Song Haixu , Li Rui , Li Xiaodong , Tian Guang , Yang Yang
Published: November 2020

The paper analyses the connotation and characteristics of world-class Energy Internet companies. And on this basis, it builds an evaluation index system of world-class Energy Internet companies. The evaluation index system includes four aspects: smart grid platform, superior energy services, steady company operation, and sustainable value creation, which contains 13 secondary dimensions totally. It provides reference and support for companies to accelerate the construction of Energy Internet.
Comprehensive Evaluation on the Removal Performance of Air Cleaners for Indoor Air Pollution
Authors: Yang Rancun , Yin Keke , Xu Peng , Wu Peipei
Published: November 2020

Portable air cleaners (PACs) are widely used as the most effective strategies to improve indoor environment. However, with the indoor air components have become more complicated, the current studies focusing on the removal performance for composite pollutants have been inadequate. Therefore, it is necessary to evaluate the comprehensive removal performance of PACs by mixture that is mainly existed in indoor air. In this study, the initial clean air delivery rates (CADRs) of several best-selling sorption-based air cleaners in Chinese market were calculated with a mixing model. The results indicated that the PACs displayed a reliable performance in improving indoor air quality, especially in terms of particulate matter purification. Furthermore, the removal performance of volatile organic compounds (VOCs) by air cleaners was found to be negatively correlated with molecular weight and polarity of pollutant, and the PACs removal performance for most VOCs was improved by reducing the concentration of particulate matter in indoor air.
Numerical simulation of the influence of water vapor on gas explosions in a high-pressure environment
Authors: Yi Xin , Zou Li
Published: November 2020

Gas explosion seriously threatens the employees security and restricts the safe production of coal mines. Therefore, it is particularly essential to investigate the prevention and control of gas explosions. In this study, a two-dimensional numerical model of a spherical explosion tank was developed to explore the effects of water vapor on gas explosions in a high-pressure environment. Explosion parameters of 10% gas, 1 MPa pressure, and water vapor contents varying from 0% to 8% were simulated using FLUENT software. The results show that the maximum explosion pressure and temperature of the premixed gas gradually decrease with increasing water vapor content, i.e., when the water vapor content is increased from 0% to 8%, the maximum explosion pressure and temperature of the gas mixture decreases from 2.52 MPa and 2092 K under dry conditions to 1.62 MPa and 1714 K with 8% water vapor. The attenuation amplitude is also reduced upon the addition of steam. Water vapor in premixed gas therefore plays a vital role in suppressing gas explosions.
Research on Sustainable Development of Forest Park Tourism Based on ASEB Grid Analysis
Authors: Qin Yu , Huang Yanling , Luo Shengfeng , Miao Yucong
Published: November 2020

In the context of the experience economy, the contradiction between the imbalanced development of tourism and the growing tourism needs of tourists has become a problem to be solved for the sustainable development of forest parks. The tourism experience directly affects the satisfaction and loyalty of tourists and should be valued by park managers. This article selects Gupo Mountain National Forest Park as the research site, explores the current status of the forest park tourists’ experience on the basis of field research, and performs ASEB grid analysis to provide corresponding recommendations for the sustainable development of forest park tourism.
Single Factor Risk Analysis of Reservoir Operation
Authors: qian Li , liang Wang , yujie Su , zhengjie Zhou , lihong Zhang , han Wu
Published: November 2020

The reservoir operation method is used for the storage routing, due to the existence of forecast information errors and other uncertain factors, it may bring risks to the reservoir and its upstream and downstream flood prevention safety. Therefore, the risk analysis is to design and implement the reservoir flood prevention and dispatch the key to the way. This paper introduces a single factor risk analysis method for reservoir operation. Taking Qingshan Reservoir as an example, the risk of reservoir operation using forecast is analysed. The results displayed that taking into account the flood forecast error, when the reservoir adopts the forecast operation method, the risk rate of the reservoir dam body safety.
Study on spatial agglomeration degree of land use in Shanghai
Authors: Yang Guang , Zhong Aijia
Published: November 2020

Spatial agglomeration of land use is the basic factor leading to the formation and continuous expansion of cities, which provides effective support for regional coordinated and sustainable development. In this paper, the status of land use in Baoshan District of Shanghai during the second and third national land survey is used to analyze the location entropy and spatial hotspot, and the change of spatial agglomeration is explored through comparison. The results show that during the period from the second to the third national land survey, the farmland in Baoshan District is scattered, the residential land is concentrated in a small scope, and the industrial land stock is large. According to the characteristics of different land use, relevant policy suggestions are put forward.