bluuebunny/crossref_metadata_2025 huggingface dataset:
Digital simulation of multioperational forest machine with a bundling device
Authors: Karpachev S , Kaznacheeva N
Published: July 2020

In this article, an innovating multi-operational forest machine with a bundling device (MOFMB) is proposed. MOFMB is based on the tractor processor (TP) and it is planned for felling trees, delimbing-bucking operations and making bundles from logging residuals. Two technologies of the MOFMB operation are considered. The first technology provides for sequential operation of the MOFMB mechanisms without combining the operations of felling and processing trees. The second technology provides for parallel operation of the MOFMB mechanisms with a combination of felling and tree processing operations. As a result of simulation experiments, it was found that the tractor achieves the highest productivity in the case of parallel operation of its mechanisms with a combination of operations of felling and processing of trees. At this case, the utilization of the manipulator on the tree felling and the processor on the tree processing and logging residuals packaging will be maximum.
Formation of the cultural landscape of urban environment using Geographic Information Systems Technology
Authors: Khamitova S M , Khamitov P S , Fedchenko E I , Ivanova M A , Yuzhakov D E
Published: July 2020

This article is devoted to the formation of the cultural landscape of an urbanized environment using Geographic Information Systems Technology. Urban plantations are the predominant elements of the natural environment. Urban plantations form the basis of cultural landscapes with their areas and diversity. The article describes the green spaces in an urban environment. In 2019, the greening of the streets of the city of Vologda was carried out. We have created an electronic greening map of the city of Vologda in the program Quantum GIS. Such a map will allow monitoring the improvement and landscaping of the territory, which will save all the useful information about the creation of plantings.
Forest change detection based on sub-pixel tree cover estimates using Landsat-OLI and Sentinel 2 data
Authors: Khovratovich T , Bartalev S , Kashnitskii A , Balashov I , Ivanova A
Published: July 2020

The paper presents a method of forest change detection and its application for clear-cutting and selective logging disturbances assessment. Based on optical remote sensing data it uses of satellite images and sub-pixel estimation of tree cover, performed by using linear spectral mixture model for estimation of forest area portion in each pixel. The paper describes the main steps of the change detection method and the influence of algorithm input settings on the results. The method was implemented as a satellite data processing tool and was tested on selected sites in Primorsky Krai and the Republic of Udmurtia regions. Forest change maps related to logging in year 2016 were developed over the test areas using the Landsat 8 and Sentinel-2 satellite data. The paper compares obtained change areas with official logging statistics and Global Forest Change project data in order to evaluate the method performance for clear-cutting and selective logging area detection.
Information Support in Environmental Monitoring Systems
Authors: Kraeva E , Kunturov A , Miklush V , Palkin I , Tatarnikova T
Published: July 2020

The current issue of environmental safety in General, and the world ocean in particular, is discussed. The main sources of pollution of the world’s oceans are listed, which, when combined, lead to progressive eutrophication of coastal marine zones and microbiological water pollution. It is shown that in order to detect pollution sources in a timely manner, predict their spread, and monitor the progress of mitigation and mitigation measures, it is necessary to organize monitoring at the protection facility. The structure of environmental monitoring is considered with a description of the functions of the system that implements the process of monitoring the object of protection. A matrix approach is proposed to determine the structure and parameters of the monitoring system, where types of pollution are deposited horizontally, and types of fields – electromagnetic, optical, infrared, acoustic, hydroacoustic, and seismic-acoustic-are deposited vertically. The matrix is formed for the territory where the monitoring system will be located and allows you to identify the most dangerous sources and determine the composition of monitoring tools.
Vegetation Cover Change in Kologrivsky Forest Nature Reserve Detected using Landsat Satellite Image Analysis
Authors: Lebedev A V , Zavarzin V V , Gemonov A V
Published: July 2020

Remote sensing of the Earth data and the results of their thematic interpretation are of great importance in monitoring forest biodiversity. Using the example of the Kologrivsky Forest Nature Reserve, a thematic interpretation of Landsat 5 images was carried out. The best quality classification of natural objects was achieved using the Random Forest and CatBoost algorithms. For the period from 1984 to 2011, thematic maps of prevailing tree species were obtained, according to which the main directions of changes in the vegetation cover were identified.
Monitoring forest fires and their consequences using MODIS spectroradiometer data
Authors: Martyn I , Petrov Y , Stepanov S , Sidorenko A , Vagizov M
Published: July 2020

Identification of fires by satellite methods and means is one of the main tasks of the modern forest fire monitoring system. The article presents a method for mapping forest fires based on the data of the MODIS Spectroradiometer, based on the analysis of the obtained images using the ScanMagic software package. In September 2009, a blocking anticyclone was established in Australia, contributing to an abnormal increase in temperatures, lack of precipitation, and as a result, the emergence of massive forest fires that led to smoke in the region. Studies have been conducted on the example of this phenomenon. As a result, the results of the study are considered, the analysis of changes in the number of fire centers and the assessment of smoke development is carried out. Currently, this method is well established and is used for detecting and analyzing fire situations, including in Australia with a wider range of functions presented in this paper.
Prospects for the use of digital technologies for monitoring green spaces in Saint-Petersburg
Authors: Melnichuk I , Tsuvareva N , Shlapakova S
Published: July 2020

The article analyzes the composition of Saint-Petersburg green spaces, the availability of green spaces for residents, the assortment of tree and shrub plants and their resistance to anthropogenic impact. We propose a solution to the problem of obtaining scientifically based information about the state of urban and suburban plantations based on modern digital technologies - Tree Talker monitoring. The organization of a monitoring system using modern methods in combination with traditional methods allows you to get reasonable and timely recommendations for the protection of plantings.
Assessment of road density in logging areas using geographical information systems
Authors: Mokhirev A , Medvedev S
Published: July 2020

In Russia, the density of forest roads is significantly lower than in countries with a developed forest industry. This negatively affects the logging efficiency and the yield of wood per unit area. There are different opinions on the normative and actual values of the density of forest roads in the forest regions of Russia. Today, it is possible to assess the density of forest roads and analyze its development using modern geographic information systems (GIS). In these studies, the density of forest roads is determined using the ArcGis software package on the territory of two forest districts of the Krasnoyarsk region. Roads located on the investigated areas territory are digitized and divided by types: year-round highway, branch, and logging road. Using the tools of the software package, the lengths and densities of roads are determined by their types. The obtained values are consistent with the indicators of other researchers from different regions of Russia. The results of this task are necessary for planning logging production when searching for wood delivery optimal routes, taking into account natural and climatic conditions.
Organizational and management mechanisms for the digital transformation of economic activities
Authors: Morkovkin D E , Kolosova E V , Sadriddinov M I , Semkina N S , Gibadullin A A
Published: July 2020

The study is devoted to the development of digital technologies in the forest industry, which potential in Russia is practically not measured and belongs to the state ownership at all. The work revealed that forests are exposed to fires, illegal logging, flooding, the spread of diseases, etc. every year, which requires state and regional structures to constantly monitor and control the state of the forest fund. The study conducted an analysis of indicators related to the state of the forest fund, which revealed that in recent years, the volumes of forests and wood have not changed, but there is an increasing tendency to destroy them. Based on the results of the analysis, it was suggested that in order to effectively account for, analyze, monitor and control the forest in the forest industry, it is necessary to apply digital technologies that will allow for the effective implementation of annual forestry supervision. At the end of the study, the stages of digital forest taxation related to the control of the number of tree stands were presented.
Using remote sensing and GIS to monitor of land cover change in the Middle Volga region during 1985-2014
Authors: Polevshchikova Yu
Published: July 2020

Study of land cover change is one of the most significant fields in sustainable development in forestry and prevention of ecological degradation in the Middle Volga region. Land use change can directly transform wide landscapes, impact on the biodiversity and eco-productivity. Due to these remote sensing technologies, take an important place in such research. GIS techniques are widely used for land cover change monitoring under climate change and human impact but the lack of reliable information on land use changes remains a major challenge of today. The research covers the assessment of land cover change caused by different types of natural and human disturbance in the Middle Volga region of the Russian Federation. This paper argues the method of monitoring of land cover change using satellite information and assessing land cover that can be beneficial for the further research affecting changes over different space and time scales.
Optical navigation of unmanned aircraft systems
Authors: Prisyazhnyuk A , Karmanov A , Prisyazhnyuk S , Karmanova N , Makarenko A
Published: July 2020

Improving machine vision in robotic systems for large-scale sensing in forestry is more relevant than ever. Currently, most UAVs are equipped with various navigation systems (SN), including optical ones. Automatic return-to-point systems are also widely used. These systems are used to facilitate piloting by aircraft, or activated in case of emergency situations. There are also optical tracking systems for the object, which are used mainly in video shooting. Optical navigation systems can be used to more accurately position spaces, and can also be used as a backup navigation system when the main navigation system fails.
Analysis on Indoor Air Pollution-a Case Study of Pengxiang Yizhai
Authors: Lyu Xudong
Published: July 2020

This article focused on the indoor air quality and conducted a case study of Pengxiang Yizhai to assess the status quo of the indoor air pollution in China. The experiment is carried out by the electronic detector, the air sample is drawn into the detection chamber through the holes in the pipes to determine the concentrations of the particles. Different concentrations of air pollutants were measured and nearly all of them exceeded the national standard. Meanwhile a public opinion poll was held to collect the opinions of the residents. After identifying indoor pollution sources and illustrating the harmful effects on human health, a couple of countermeasures to address the pollution problem were finally given in this paper.
Numerical simulation of acoustic agglomeration of fine particles in sintered flue gas of steel production
Authors: Zhao Yun , Zhou Hefeng , Tian Zhangfu , Zeng Xinwu , Gong Changchao
Published: July 2020

Fine particles in the sintering flue gas of steel production account for the vast majority, which is the primary control object of PM2.5 emission sources. Traditional dust removal methods have low capture efficiency for fine particles below 1 micron. Previous research on acoustic agglomeration has focused on broad-spectrum smoke, and there is a lack of understanding of the agglomeration process of sub-micron narrow-spectrum case. Based on the zoning method, the time evolution data of particle size distribution (PSD) and agglomeration efficiency corresponding to different frequencies, sound pressure levels (SPLs), and particle concentrations under the sub-micron narrow-spectrum condition are calculated in this paper. The data analysis shows that the agglomeration efficiency of the fine particle dominated flue gas increases with the increase in the frequency of action. High sound intensity conditions are conducive to improving the agglomeration efficiency, and high flue gas concentration conditions can significantly reduce the emission reduction time and energy consumption. Compared with broad-spectrum flue gas, due to the small difference in particle size and movement speed, under the same action conditions, fine particles occupy a longer agglomeration time, and the required acoustic intensity is higher, which is not conducive to practical industrial applications. Therefore, after adding a small amount of large-size particles, the acoustic agglomeration of fine particles dominated smoke was studied. Theoretical analysis shows that the presence of a small number of large particles in the flue gas significantly enhances the agglomeration efficiency and reduces the time of action and the acoustic intensity. In-plant tests verified the feasibility of acoustic agglomeration in the real-time treatment of sintered flue gas and the advantage of adding a small amount of large particles. The test sound frequency range is 50 Hz to 2 kHz, the fundamental frequency SPL is 87.3 ~ 161.8dB, and the action time is within 3s. The measured PM2.5 emission reduction efficiency is 16% ~ 92%, and the optimal frequency is about 800Hz.
Study on the Stabilization of Chemical Stabilizers for the Treatment of Lead and Zinc Smelting Sludge from Sulfuric Acid Sewage
Authors: Zhang Hua
Published: July 2020

Using the adsorption and precipitation effects of the stabilizers on arsenic and selenium, the experimental study on the stabilization of lead and zinc smelting sludge was carried out, and the influencing factors of the stabilizers were discussed to determine the feasibility and optimal test parameters of the experiment. The results show that the stabilizers can effectively reduce the leaching concentration of arsenic and selenium in lead and zinc sludge, and the stabilization effect is significantly improved compared with the control. When the amount of the stabilizer K is 5%, the stabilizing effect of arsenic and selenium is increased to 90% and 55%, and the leaching concentration of arsenic and selenium is lower than the national standard (GB5085.3-2007). It shows that the material is very effective in stabilizing lead and zinc mixed sludge.
Influencing Factors of DCMD for Treatment of RO Concentrate Wastewater on Water Reclamation
Authors: Zhang Xiaohui , Cao Qiguang , Li Song , Xie Guoli , Xing Linan , Zheng Mingyue , Lu Peng , Zhang Jian
Published: July 2020

Direct Contact Membrane Distillation(DCMD) device with PVDF as the core was introduced to treat concentrated Reverse-Osmosis(RO) wastewater on water reclamation. Effects of feed temperature, feed flow rate and permeate flow rate on flux were investigated. Furthermore, variation low of permeate flux and the main water quality during long-term membrane distillation(MD) performance were discussed. It can be concluded from the result that the permeate flux were increased with the feed temperature. When the temperature difference between hot-side and cool-side reached 35°C, the permeate flux was 7.15 kg/(m2•h), and then the growth trend of flux slowed down. The permeate flux were increased with the increase of feed flow rate and permeate flow rate, and the peak reached 8.2 kg/(m2•h) in the whole process. The permeate flux stabilized at 7.1～8.36 kg/(m2•h) during 16 hours long term experiment performance and the permeate water quality were kept steadily.
Screening for Reducing Ammonia Emissions in Broiler Feed Probiotics
Authors: Jinlan Gu , Lui ZHang , Cheng Shumei
Published: July 2020

The purpose of this study was to screen Probiotic can improve feed utilization rate, improve broiler gut environment, reduce emissions of ammonia in the purpose of broiler manure. Through the simulation of the digestive tract of broiler environment, high yield cellulase, amylase, protease, screening of microbial inhibition of gutharmful bacteria, and conduct the feeding experiment. The results show that the concentration of ammonia in the chicken house when feeding Bacillus subtilis for 58 hours was 13.814 mg / m3, which was lower than that of the People’s Republic of China Agricultural Industry Standard NY / T 1167-2006 Environmental Quality Standard for Livestock and Poultry Farms, Experiments show feeding broilers with Bacillus subtilis can reduce the production of harmful gas ammonia and effectively improve the environment of livestock and poultry houses.
A Comparative Study of Environmental Accounting Information Disclosure between China and Developed Countries
Authors: Shen Jianfei , Chen Yidan
Published: July 2020

Natural resources and ecological environment are the basis for human survival. With the increasing severity of the contradiction between economic development and environmental protection, the public is paying more and more attention to environmental information. From the perspective of disclosure regulation and disclosure mode, this paper compares the differences in environmental accounting information disclosure between China and four developed countries: the United States, Britain, Japan, and Canada, and then puts forward some suggestions for improving the environmental accounting information disclosure system in China based on the comparison.
Heavy metals decreased by water elution method on bottom ash from municipal solid waste incineration plant
Authors: Lu Peng , Zhang Ai-Jia , Xing Li-Nan , Cao Qi-Quang , Zhang Xiao-Hui , Xie Guo-Li , Zheng Ming-Yue , Yuan Yuan , Chen Hong-Mie , Yang Dong-Qing , Zhang Quan-Hong , Ren Li-Mei , Wang Tao , Li Song , Zhang Jian , Zhang Zongzheng
Published: July 2020

By incineration treatment became the most important g municipal solid waste disposal method. The bottom ash, which accounting for 20% to 30% of the original municipal solid waste has been a large content source of municipal solid waste in China. The heavy metal will be released to the environment by the eluent produced from the bottom ash. It has a negative influence on bottom ash treatment and reuse. This study analyzed the changing of heavy metals of Cu, Ni and Zn during the elution process by the column simulation experiment. The study revealed the regulation of heavy metals migration under the condition of slow speed elution. These results can help environmental release risk assessment of heavy metal in bottom ash from municipal solid waste incineration plant.
Pilot Scale Study on Combined Ultra Filtration and Other Technique to Treat Rural Domestic Sewage
Authors: Lv Zongxiang , Zhou Zihao , Pan Run , Ding Aifang
Published: July 2020

The rural domestic sewage was treated by using combined ultra filtration with reverse osmosis (RO), constructed wetlands and biofilter respectively. The results showed that the average concentrations of COD, TP, NH4-N and TN in the effluent were 118.1, 5.4, 75.5 and 85.0 mg/L, and the average removal rates were 77.0%, 58.1%, -2.7%, and 15.1% by ultra filtration respectively. And then the effluent treated by RO process, the above water quality indicators had reached the I A level of the discharge standard of pollutants for urban wastewater (GB18918-2002). The average removal rates of COD were 35.6% and 35.1%, TP were 11.9% and 9.8%, NH4-N were 5.4% and 23.7%, TN were 6.1% and 7.6% by constructed wetlands and biofilter respectively. The overall removal rates of pollutants were not high and the effluent quality was not stable through the above two techniques. Therefore, further improvement is needed in design and operation of constructed wetlands and biofilter. Ultra filtration-reverse osmosis integrated equipment can be designed to treat dispersed domestic sewage in rural areas.
Swarm System of Unmanned Sewage Treatment Vessel in Large Waters
Authors: Yuan Bin , Hu Juntong , Lai Xiaobo , Lv Yijin , Liu Yingjiu , Rong Lishan
Published: July 2020

The Swarm System of unmanned sewage treatment vessel in large waters is mainly used to deal with water pollution in large waters. The purpose of the system is to provide assistance to large water areas such as Chaohu Lake whose self-purification capacity is insufficient to solve their own pollution or which have lost their self-purification capacity. The Swarm System is able to carry out water treatment and water quality monitoring to help lakes to restore the ecological environment of water body and self-purification capacity. This system adopts the working mode of local pump in treatment and discharge. The water quality monitoring system, which is combined with BeiDou positioning system and data transmission system, has the ability of presenting the water pollution situation in a three-dimensional way and stronger pertinence in sewage treatment. The mechanism of the system is similar to Unmanned Aerial Vehicle, which is considered as high working efficiency, fast processing speed, low cost and high intelligence.
Evaluation of Advanced Treatment Technology of Dyeing Wastewater Based on Analytic Hierarchy Process
Authors: Chen Xin
Published: July 2020

Determining the weight of the evaluation index is an important prerequisite for the evaluation of advanced wastewater treatment technology in the printing and dyeing industry. The article builds an evaluation model of 10 indicators of advanced treatment technology for printing and dyeing wastewater from three aspects: environmental benefits, economic benefits, and technical performance. Furthermore, the analytic hierarchy process was used to determine the weight of each index of the evaluation system. The calculation results show that the consistency ratios of the established judgment matrices are all less than 0.1, which has a good consistency, and the hierarchical single-ranking results all meet the requirements of consistency test. Therefore, the evaluation value of the advanced treatment technology of printing and dyeing wastewater calculated by AHP is more accurate and reliable. It can provide technical support for the next step of evaluating the performance of printing and dyeing wastewater treatment.
Research on multi-source coordination evaluation model of regional energy Internet
Authors: Guo Lei , Wang Linyu , Wang Yongli , Yang Jiale , Dong Huanran , Zhou Minhan
Published: July 2020

Energy Internet is the direction of energy development and an important means to change energy structure and improve energy efficiency. In order to promote the application and development of energy Internet, starting with the study of the key factors affecting the level of energy efficiency in the regional energy system, a multi-source optimization energy efficiency evaluation index system of regional energy Internet is established. Through the subjective evaluation of the first level indicators, the objective evaluation of the second level indicators and the final comprehensive empowerment, the comprehensive evaluation model of regional energy Internet multi-source optimization energy efficiency is built. Finally, taking a multi-source coordinated optimization operation of a park in Zhejiang Province as an example, the scientific rationality of the evaluation indexes and methods is verified.
Risk Assessment of Grid Communication System Based on MIC-FNN under SG and UPIOT
Authors: Yue Yunli , Jia Xuefeng , Li Cunbin
Published: July 2020

The communication system is the carrier of grid and information network coupling. The construction of reliable Smart Grid and Ubiquitous Power Internet of Things depends on the high coupling between the power grid and the information network. With the development of” the Grid and Internet”, the risk assessment of the power grid communication system has the characteristics of various levels, complex indexes and strong correlation. To deal with the risk effectively, this paper proposes an index system for evaluating the operation risk of grid communication system, which includes the cable loss level, the communication network power supply risk, the equipment operation risk, the external environment risk, the business interruption risk and the management risk. At the same time, a risk assessment model is built based on a fuzzy neural network, which overcomes the problem that traditional risk assessment methods rely too much on expert experience and makes prior knowledge embedded in the network. Finally, the model is proved to be scientific and practical by an example analysis.
An analysis of generator trip caused by mistransmitting high temperature signal from excitation transformer
Authors: Qian Zhunli
Published: July 2020

The excitation transformer is a device that specifically provides three-phase AC excitation power for the generator excitation system. The excitation system converts the three-phase power to the generator rotor DC power through the thyristor to form the generator excitation magnetic field, which is adjusted by the excitation system thyristor trigger angle, to achieve the purpose of adjusting the motor terminal voltage and reactive power. This article analyzes an accident in which the excitation transformer high temperature signal is erroneously caused to cause the unit to trip. The unplanned shutdown accident is specifically analyzed from the aspects of on-site situation investigation, cause analysis, main problems exposed, treatment and preventive measures.
Construction and Application of Scheduling Model of Power Grid Infrastructure Project Based on Delegate Power and Optimize Service Policy
Authors: Sheng Kun , Yan Huifeng , Xiang Ying , Yang Jun , Chen Yidong , Deng Jiaxi , Chen Wei
Published: July 2020

In order to adapt to the reform of transmission and distribution price, implement the company’s requirements of the policy of Delegate Power and Optimize Service, realize the precise investment of power grid and help the high quality development of power grid. It is urgent to explore a scientific and effective method of project schedule, assist the grid investment decision-making, and improve the level of investment plan management.
Research on Primary Frequency Modulation of Coordinated Control System for Wind Power Generator and Thermal Power Unit
Authors: Han Yingkun , Gao Song , Li Lei , Miao Weiwei , Li Yuanyuan , Yan Qing
Published: July 2020

Combined with the practical problems in the development of power system, the paper introduces the technical scheme and characteristics of primary frequency modulation(PFM) for thermal power units. Aiming at the impact of the rapid development of wind power generation on the stable operation of the power grid, the PFM strategy on the coordinated control system for wind power generators and thermal power units is proposed to dynamically adjust the PFM capacity of thermal power units, which effectively make up for the adverse impact of the uncertainty of wind power generation, and improve the stable operation capacity of the power grid. It has certain reference significance on the flexible operation control optimization of the power grid in the wind power centralized area.
The Research on the Benefit Evaluation Methodology of the Global Energy Internet and Case Analysis
Authors: Jin Yanming , Feng Junshu , Peng Fang , Wang Xiaochen , Xue Tan , Zhao Qiuli
Published: July 2020

This research focuses on the impact of Global Energy Internet(GEI)on the power system, energy environment, economy and society, and builds the comprehensive benefit assessment system of GEI. The benefit evaluation model system that realizes the quantitative assessment of the comprehensive benefits of GEI from the perspectives of economy, society, energy, and environment is constructed, which is based on global power Planning and production simulation model, Global Trade Analysis project(GTAP) and Climate Change Assessment Model (MEGGIC).The results show that GEI is conducive to realize the complementary benefits of multiple energy sources across region, achieve a win-win between the main sending and receiving areas, promote the use of renewable energy resources, and help achieve the 2°C temperature control target.
Analysis and Elimination of Shutdown Fault Caused by Mechanical Overspeed Protection of Diesel Engine
Authors: Lu Jia , Chen Zuotian , Dong Qingfeng , Zhang Zhigang
Published: July 2020

The article introduces the phenomenon of a single auxiliary engine overspeed fault alarm and stopping during a certain sea voyage. Through analysis and investigation, the post personnel finally accurately located the fault because the micro switch of the mechanical overspeed protection device was loose. Post personnel were eliminated in time and the status of the remaining units was also checked to ensure the stable operation of the ship’s power generating diesel engine.
Dynamic Coordination Control of HEV Unsteady Operating Mode Switching Based on MPC
Authors: Zhang Hongdang , Zuo Yanyan , Yang Hongtu , Zhang Fengjiao , Chen Song
Published: July 2020

Aiming at a hybrid electric vehicle (HEV), the impact problem is studied during the mode switching process under non-steady-state operating conditions. Firstly, the system dynamics model is established, the dynamic characteristics of unsteady conditions are analyzed, the BP neural network engine torque estimation model based on genetic algorithm optimization is established, and the engine torque is estimated online. MG1 torque coordination control and MG2 active compensation control are adopted, a mode switching coordination control strategy based on model prediction is proposed. The MATLAB / Simulink simulation platform is used to verify the effectiveness of the control algorithm. The simulation results show that the coordinated control strategy can effectively achieve the output torque compensation of the drive motor. The engine is actually close to the target torque. Compared with the uncoordinated control, During the speed synchronization phase, the maximum impact of the vehicle was reduced by 60.4%.
Economic analysis of the solar thermal and air source heat pump combined system for energy demand of buildings in China
Authors: Fu Feifei
Published: July 2020

This study focus on the economy of the solar thermal and air source heat pump combined system supplying the same demand of SH and DHW for a city household at different locations in China, namely; Beijing, Xi’an and Nanjing. These three locations represent the climatic conditions variety in China with different outdoor temperatures and solar radiation. At each location, the optimized simulations are carried out to recognize the most economical configurations. The results show that, for a 15-year running time, the system comprising 10m2 solar collectors and 5 kW air source heat pump is the best configuration having the minimum cost for all three cities, but the minimum cost of which is different for each location. At Nanjing, the system has the lowest cost of all the three cities, and the payback time of which is also the shortest. However, the payback time of the optimum system in Beijing is 15.9 years exceeding its running time, due to the lowest central heating fee included in the cost of the traditional heating method.
Multi-objective optimization design of regional integrated energy system
Authors: Li Xueliang , Wu Kuihua , Qi Lujie , Cui Can , Liu Dunnan , Li Chen
Published: July 2020

With the continuous development and progress of human society, the exploitation and utilization of fossil energy has also increased rapidly. With the intensification of the energy crisis and the continuous deterioration of environmental problems, it is urgent to find an energy-saving and environmentally-friendly Energy supply methods to replace traditional energy supply systems with high energy consumption and high pollution. The regional integrated energy system, by integrating multiple energy types and energy conversion equipment, can realize the stepwise and efficient use of energy, which is one of the important ways to solve the above problems. The performance of a regional integrated energy system is closely related to its planning and operation. Without proper system configuration and appropriate operating strategies, the system will not be able to achieve its due benefits. Therefore, it is urgent to propose comprehensive energy planning and operation optimization methods.
Research on the Evolution Path of China’s Power Spot Market
Authors: Fan Menghua , Qu Haoyuan , Yang Su
Published: July 2020

Recently, the construction of China’s power market is accelerating. With the continuous expansion of market-oriented trading scale and the rapid development of renewable energy, the balance of electric power supply is facing challenges, and all sectors of the society have strong demands to develop the spot market as soon as possible. The government requires that “by the end of 2018, the spot trading pilot should be launched; in 2020, the spot trading market should be fully launched”, and 8 spot market pilots have already been launched. By the end of September 2019, 8 provincial-level spot market pilots have completed the continuous settlement trial operation. With the development of spot market pilots and the further improvement of market conditions, it is necessary to gradually promote the integration and opening of provincial markets to enhance large-scale optimal allocation of resources. This paper focuses on the evolution mode and path from provincial market to national unified power market. Two modes are proposed and compared based on the conditions in China. This research is beneficial for the construction of national unified power market and prompting large scale power trading.
Predictive Control Of Transient Air-Fuel Ratio for Gasoline Engine Based on Wavelet Network Inversion
Authors: Song Dandan , Li Yuelin
Published: July 2020

To achieve accurate control of the transient air-fuel ratio for gasoline engines, a composite predictive control method based on wavelet network is proposed. The inverse system of transient air-fuel ratio system was to identify with wavelet network, which is able to dynamically compensate intake flow with feedforward control, and a pseudo-linear system is formed by cascading the inverse system with the original system. Then the dynamic matrix control(DMC) was used as a compensation for both internal and external disturbance in real time, and the effective control for transient air-fuel ratio system of nonlinear, time-delay and time-variation is realized. Finally simulated with experiment data at transient conditions, the results show that the inverse model based on wavelet network can accurately approximate the air fuel ratio transient process, and this method has stronger robustness and anti-interference. Therefore, the composite predictive control strategy has good control performances and can improve the control precision of air-fuel ratio in transient conditions.
An analysis of the burning accident of the tower bottom cabinet of G58-850KW wind turbine group
Authors: Xiong Guozhuan , Zhang Yuechao , Yang Peiwen , Zhu Zhe , Hu Peng
Published: July 2020

In March 2020, an accident happened in a wind farm in Jilin Province, which caused huge economic losses. Based on the investigation of the operation process at the scene of the accident, the burning condition of the equipment and the historical data of the relevant faults, it is found that the cause of this accident was the insulation aging between the low-voltage side turns of the transformer in the power converter cabinet. In the process of opening the main circuit of the equipment, the over-voltage phenomenon of the transformer occurs, which leads to the phenomenon of electric spark explosion. Through the accident analysis, a series of rectification measures are obtained, which will play a reference role for the subsequent maintenance and operation of wind turbines.
Application of Visualization System in Power Grid Dispatching
Authors: Wei Hou Ya
Published: July 2020

In recent years, the scale of power grid has been expanding, the demand of users for electricity has been increasing, and the importance of power dispatching system has been reflected. However, in order to improve the security and reliability of dispatching operation and reduce the working pressure of dispatching personnel, this paper proposes to use visualization technology to cooperate with other systems in the actual operation of regional power grid, and to help technicians to analyze and process the local data information extracted from many data by means of man-machine interface.
A system dynamics analysis about the recycling and reuse of new energy vehicle power batteries: an insight of closed-loop supply chain
Authors: Yang Jian , Mu Dong , Li Xin
Published: July 2020

In order to solve the problem about recycling and reuse of power batteries for new energy vehicles in China, the paper, from the perspective of closed-loop supply chain (CLSC), uses VENSIM software to construct the system dynamics model. By analyzing the degree of cooperation among enterprises in CLSC, the result indicates that through cooperating with foreign excellent enterprises and enhancing the degree of cooperation among enterprises in the CLSC, the development of new energy vehicle power battery recycling can be better promoted. In addition, this paper puts forward some reasonable suggestions on the development of new energy vehicle power batteries.
Study on the connection and settlement of forward electricity market and spot electricity market
Authors: Tang Chenghui , Zhang Fan
Published: July 2020

In recent years, China’s electricity market construction has gradually accelerated. Provincial medium and long-term electricity markets (forward market) have been established. Spot electricity markets have been established and have been in the trial operation stage in several pilot provinces in China. This paper introduces the connection and settlement of the forward electricity market and the spot market. The paper mainly discusses the contract for differences mechanism between the forward electricity market and the spot market when the forward bilateral contract are a financial contract. The strategy of forward bilateral contracts is studied according to the price expectations in the spot market.
Discussion on the remote visual control technology system of fully-mechanized heading face in mine
Authors: Gao Xubin
Published: July 2020

According to the present status of the intelligent and informational level of fully-mechanized heading face in mine, the remote visual control technology system of fully-mechanized heading face is put forward on the basis of the analysis of the working requirements of fully-mechanized heading face and the necessary intelligent information technology support for individual equipment and complete equipment of heading face. The six key technologies of complete equipment cooperative control, intelligent cutting, intelligent anchoring, intelligent transportation, working face vision, fault diagnosis and prediction are expounded. The present status and technical feasibility of fully-mechanized equipment are analyzed in detail, and the technical route of remote visual control of fully-mechanized heading face is defined. The problems that need to be innovated according to local conditions in the aspects of accessory materials transportation and environmental safety monitoring are put forward to realize the integration of the intelligent system. At present, through the remote visual control technology system, the goal of reducing people and increasing efficiency, safe operation and production data accumulation in fully-mechanized heading face has been achieved.
Power grid operation and maintenance investment allocation based on gridded information entropy multiple attribute evaluation Optimization Technology Research
Authors: Yu Min , Liu Fuyan , Shen Jie , Liu Jinpeng
Published: July 2020

Under the new situation, China’s power grid enterprises will face a situation of limited funding for operation and maintenance and increasing pressure on cost control. Therefore, further improving the scientificity of grid operation and maintenance investment allocation is of great significance to the operation and development of grid companies. Based on the problems of current operation and maintenance input allocation, this paper proposes a grid operation information entropy multi-attribute evaluation-based optimization technology for power network operation and maintenance input allocation, and combines empirical analysis to verify the scientific rationality of the allocation technology. The optimization technology can provide support for grid operation and maintenance investment decision-making and enterprise lean management.
Analysis of Energy Saving Effect of Large Double-speed Salient Pole Synchronous Motor in Renovation of Pumping Stations
Authors: Wang Zhixiang , Deng Bo
Published: July 2020

The water levels influenced by seasons are varying, which needs a great variation of pumping head. The motor now used with complex speed equipment and high cost cannot satisfy the requirement. The paper takes the renovation and transformation of Song Long pumping station as an example, analyses the effect of using large double-speed salient pole synchronous motor. It offers a comparative analysis of the energy-saving benefit, which has three major evaluation indexes: device efficiency, unit energy loss and the benefits. The related research results can be referenced in the renovation and transformation of pumping station.
Residual mining caving face over the roadway and the key technology of deformation
Authors: He Jun
Published: July 2020

Multi layer multi angle face roadway of coal mining face of residual mining brings technical challenges to the safety of the working face mining. With the background of the 6212 residual coal mining face in a mine in Shanxi, the deformation laws of the surrounding rock in the slanted roadway, the bottom coal slanting roadway and the intersection point are analyzed by numerical simulation. The simulation results show that at least the reinforcement measures should be carried out by 20m in the empty lane, and the plastic zone in the floor of the roadway along the top is obviously developed, and the stress concentration of the surrounding rock is high, and the support and management should be strengthened. In view of the space position of the site, the key technical measures are put forward, such as dense support or wood stack, anchor net cable, and super high water material grouting pre-filling, so as to ensure the safe recovery of the residual mining face.
Research on Wind Power Ultra-short-term Forecasting Method Based on PCA-LSTM
Authors: Wu Siying
Published: July 2020

Wind power ultra-short-term forecasting can provide the support for adjusting the intraday power generation plan, carrying out the incremental spot trading of wind power, and improving the utilization of wind power. In order to improve the forecast accuracy of wind power, a wind power ultra-short-term power forecast method based on long-term-term memory (LSTM) network is proposed. First, the principal component analysis method is used to reduce the multivariate meteorological time series dimension. Then by using the cyclic memory characteristics of LSTM network to model multi-dimensional time series, the nonlinear mapping relationship between meteorological data and power data is established, and the wind power forecast is finally realized. The actual data of the eastern China wind farm is used to verify the results. It shows the method established in this paper can effectively use the meteorological and power data to forecast the wind power, and compared with the traditional time series, BP neural network method, the method in this paper has higher forecast accuracy and has broad application potential.
Analysis of Natural Ventilation Design in Large Space of Railway Station
Authors: Han Xiaolin , Zhang Hui , Zhu Ting , Wang Li
Published: July 2020

Generally, natural ventilation is a useful passive design method to improve thermal environment, especially in large space buildings. Taking Zhengzhou East Railway Station (Zhengzhou ERS) as an example, this paper discussed the natural ventilation of Zhengzhou ERS by comparing experimental test with simulation of Computational Fluid Dynamics (CFD), based on local climate characteristics. Then, combined with the Zhengzhou ERS model, optimized natural ventilation design was proposed by comparing the natural ventilation conditions of different types of roof forms. And some ideas and reference were provided to improve indoor thermal environment and passive energy-saving design for large-scale railway station buildings.
Research on Coordinated Development of Ecological Resources, Environment and Economy and Society in Sanjiang Region
Authors: Xue Tingting , Zhang Yaosheng , Wang Xue , Zhao Chenchen , Li Lan
Published: July 2020

An excellent environmental resource environment is a necessary condition for coordinated economic and social development in the Sanjiang region. This article uses four methods of literature review, qualitative analysis and quantitative analysis, static analysis and dynamic analysis, and a combination of theory and empirical research to comprehensively evaluate the degree of coordinated development and coordinated development of eco-resources, environment, economy and society in the Sanjiang region. Analyze the coordinated development of ecological resources, environment, and economy in the Sanjiang region and its spatiotemporal evolution, and propose specific suggestions and countermeasures. The study found that economic development and environmental protection are the two main issues facing social development in the Sanjiang Plain. On the one hand, we must rely on science and technology to vigorously develop the economy, promote the upgrading of the industrial structure, and then promote the development of regional society. The protection of the environment and avoiding environmental degradation direct constraints the development of human culture.
Study on buffeting performance of double cantilevers of П type beam cable-stayed bridge under oblique wind
Authors: Zhang Yao , Li Han
Published: July 2020

Based on the aeroelastic model experiment of a long-span cable-stayed bridge, the vertical and torsional buffeting responses of π beam under different wind deflection angles are studied, and the influence of wind attack angle on buffeting response is further studied. The results show that the vertical and torsional buffeting displacement responses of the main girder increase in quadratic function with the wind speed. Moreover, the maximum value of buffeting response is not at the 0° wind deflection angle, and the position of the most unfavorable buffeting response is different under different attack angles. With the increase of wind deflection angle, the vertical and torsional buffeting displacement response of π type girder generally decreases first and then increases, then decreases and then increases, presenting the phenomenon of “three twists and turns”. The increase of wind deflection angle to buffeting response is generally between 10% and 20%, and the maximum can reach 40%. The comparison between the test results and the analysis results shows that the influence of the oblique wind effect and the wind attack angle on the buffeting response must be considered when analyzing the buffeting response of the cable-stayed bridge.