bluuebunny/crossref_metadata_2025 huggingface dataset:
Surface modification effect on particle size and stability of Yellow Pigment
Authors: Zhan Shijing , Du Wuqing , Hu Ke , Xu Yushan , Zhang Yalin , Wang Ying , Su Zhaoyi , Ye Jiale , Fu Chaoqiang , Lv Jingmei
Published: September 2020

NaOH solutions with different concentration were used to pre-treat YPs (yellow pigments) in order to investigate surface modification effects on stability and particle size of pre-treated yellow pigments (PYPs). The coupling agent KH550 was used to treat PYP10 (yellow pigment pre-treated with 10% NaOH) to be compared for PYPs. The YPs (yellow pigments) were pre-treated by NaOH solutions and rinsed with C2H5OH, then the filtrates and residues were analysed by spectrophotometer and laser granularity analyser; The filtrates are stratified after the PYPs rinsed with C2H5OH. Microscope and Natural settling experiment were used to analyse the particle size and stability in residues. The results show that the particle size of wet PYPs decreased with the concentration of NaOH, and the particle size of PYP30 was smaller than that of PYP10-KH550 (PYP10 treated with 5% KH550). The laser granularity analyser results show that the particle size of dry PYPs increased with the concentration of NaOH. The settle time of PYPs in water indicated that the stability of PYPs increased with the concentration of NaOH and PYP10-KH550 has the poorest stability. These results indicated that PYP30 has smallest particles and best stability, and it has the potential to be used in industry.
The Evolutionary Characteristics of the Coupling Relationship of Energy, Economy and Environment in Hebei Province, China
Authors: Cao Yuliang , Guo Kaixuan , Zhang Qiong , Li Xiuyuan
Published: September 2020

Based on the system coupling mechanism, a three-system coupling model of energy, economy and environment is constructed. Based on the panel data of Hebei Province from 2010 to 2019, the empirical analysis of the development status of the three systems of energy, economy and environment in Hebei Province. The results show that the coupling degree of the three systems of energy, economy and environment in Hebei Province generally shows an upward trend, and the coupling degree is consistent with the coordination degree of energy-economy, energy-environment and economy-environment. The coordinated development of each binary system is the basic guarantee for the increase in the coupling of the ternary system.
Analysis on the influence of upstream and downstream water levels of Puyang River on Meichi area
Authors: Hu Chun , Chen Daoxin , Guo Huifang
Published: September 2020

Meichi station is located in the lower reaches of Puyang River, where Puyang river forms a bucket shape. This place is affected by the upstream flood and the downstream tidal current, so it will be disastrous when it rains. In order to clarify the main causes of flood disaster at Meichi station, this paper analyzes the contribution of water level of Zhuji station in the upstream, Linpu station in the downstream and wenjiayan station on the top of Qiantang River to Meichi station. Through analysis, the downstream water level has the greatest impact on Meichi station. It is suggested that the downstream water level should be lowered as much as possible before the flood to reduce the impact of flood on Meichi area.
Research on the Spatial-temporal Changes and Driving Forces of City Green Space in Kunming
Authors: Zhang Zhuoya , Zhi Linjiao , Yang Junjie
Published: September 2020

To explore the spatial and temporal changes and driving forces of city green space in Kunming since 1950, and provide a reference for future city green space development planning. Through consulting a large number of documents, Kunming statistical yearbook and field investigation, the geospatial analysis method and comparative analysis method were used to analyze the spatial and temporal changes of the park green space above 5hm2 in the downtown area of Kunming, and its driving force was analyzed by qualitative analysis method. The results shows that (1) There are four development stages in the construction of city green space in the downtown of Kunming. (2) The city green space in Kunming city center> 5hm2 ranks in order as Chenggong District, Panlong District, Xishan District, Wuhua District, Guandu District. (3) There are four trends in the spatial distribution of city green space. (4) The driving force mainly includes geographical factors, economic factors, population factors, transportation factors, and policy factors. After the comprehensive effect of various aspects, the current city green space distribution pattern in Kunming is formed.
Water source area of water diversion project in eastern Zhejiang Province’s Rainfall prediction
Authors: Ma Haibo , Guo Huifang , Yang Haiping , Zhang Yenan
Published: September 2020

The water diversion project in the east of Zhejiang Province is a major water resource allocation project, it to ensure the sustainable development of economy and society in the boat area of xiaoshaoning in the east of Zhejiang Province. The task of the project is to introduce Qiantang River water to provide living, industrial and agricultural irrigation water for xiaoshaoning plain and Zhoushan City, and it also can improve this place’s water environment. The rainfall in the water source area of the water diversion project in eastern Zhejiang directly affects the water consumption in this area. In order to ensure the safety of the water diversion project in eastern Zhejiang, it is very important to make a scientific plan for the water diversion project and predict the rainfall in the water source area of the project. Wavelet analysis is a good method of multi-time series and multi-scale analysis. Firstly, this paper decomposes the annual rainfall series of wenjiayan rainfall station, which can represent the water source of eastern Zhejiang Province.Then, it uses wavelet de-noising technology to remove the noise of the decomposed high-frequency series, Next it uses wavelet reconstruction and ANFIS model to simulate and predict the reconstructed series, from which it can calculate the forecast value of the future rainfall. By analyzing the rainfall frequency of wenjiayan rainfall station in the future, this paper provides a reference for the water diversion project in the east of Zhejiang Province.
Multi scale analysis of rainfall in Anhua reservoir
Authors: Zhang Jixiang , Guo Huifang
Published: September 2020

Anhua reservoir is located in Zhuji City on the upper reaches of Puyang River (the upstream of reservoir area involves Baima town of Pujiang County), which is an important medium-sized reservoir mainly for flood control. In this paper, the continuous wavelet transform of wavelet analysis is used to analyze the rainfall of Anhua reservoir in multi-scale. The results show that the main period of rainfall in Anhua reservoir is 6-33 years. In the 33 year scale, the rainfall from 2020 to 2030 is relatively dry, while in the 6-year scale, the rainfall from 2020 to 2023 is relatively dry. It can be seen that the rainfall in Anhua reservoir will be less in the next few years, so the reservoir management department should take measures in advance.
Research on Disaster Prevention and Mitigation System Construction Based on Marine Business Work
Authors: Sun Yuxi , Chen Chen , Tan Jun
Published: September 2020

As global climate change intensifies, the po Marine business work, disaster reduction, disaster prevention, spatial analysis, risk synthesisability of marine disasters becomes greater and greater. In order to reduce the damage caused by marine disasters and to be able to shoulder the responsibility of major powers in facing marine disaster risks, China needs to establish China’s domestic marine disaster prevention and relief system and international cooperation mechanism for disaster prevention. On this basis, a preliminary idea for establishing a disaster risk assessment system was proposed. After the system is completed, the spatial analysis function based on GIS, combined with the disaster risk assessment database, can quickly, practically and accurately provide special disaster risk results for disaster prediction and prediction of relevant departments and select effective and scientific disaster prevention, mitigation and relief Measures provide the basis.
Prevention of Metal Tailings Based on Ecological Safety
Authors: Miao Zuohua , Yan Cheng , Liu Likun , Ren Lei , Chen Yong
Published: September 2020

The tailings pond is a place for storing industrial solid wastes in mines. Due to insufficient mining, the tailings contain a variety of heavy metals. The heavy metals discharged into the tailings pond will pollute the soil and groundwater and affect the ecological environment. The comprehensive utilization of tailings is inappropriate. Will cause pollution transfer. This article analyzes the environmental pollution and ecological damage of the tailings pond, and puts forward the comprehensive utilization of tailings, the anti-seepage of the tailings pond and the environmental supervision during the construction period, follow-up inspection, tailings treatment and ecological environmental protection and restoration treatment, which effectively alleviates the tailings pile. Environmental pollution and safety hazards caused by after the tailings mining is completed, effective ecological reconstruction measures are taken to reduce pollution and protect the surrounding environment.
Tracking the Motion of Large-Scale Lightning Events based on the Optical Flow Method
Authors: Zhu Yongqiong , Min Wu , Cao Zhenwei
Published: September 2020

Lightning is a meteorological phenomenon and can cause the property damage and the loss of the lives. Tracking and warning the lightning is a very important issue in safety control and management for many fields. Some devices and corresponding analysis methods are suggested for this objective. Nowadays, the satellite and radar are two main devices used to track and warn lightning. However, their output is an indirect signal for the tracking and warning. So the false positive problem exists if only based on these two types of devices. Instead, this work proposes a new method. We use another kind of data from the lightning locator, which is the only device could accurately record the time, position and strength for one lightning occurrence. Meanwhile, in order to effectively apply this type data, an integrated method based on the optical flow method is proposed. On a real lightning process, the experiment’s result proves our method’s performance. Unlike the traditional methods that only track the representative center to stand for the motion of a group of lightning, the most outstanding advantage of our methods is the capability of detecting the minor motion of large-scale lightning events. Therefore, it could be used for the elaborate lightning warning.
Application Analysis of Immobilized Bioremediation Preparation in Oil Spill Contaminated Shore
Authors: Wang Xiaohui , Liu Yang , Song Chunyan , Yuan Xin , Zhang Qiong , Miao Yongxia
Published: September 2020

The thesis uses self-developed immobilized bioremediation preparations to carry out on-site trials of bioremediation of oil spilled contaminated beaches, with a view to solving the practical problem that traditional dry powder / liquid bioremediation preparations are difficult to be applied on site in oil contaminated shores. The degradation characteristics of the marine petroleum degrading bacteria group DC10 were studied, and a degrading bacteria agent based on the bacteria group was developed and used in the bioremediation experiment of Dalian Oil Spilled Beach, and the intertidal and upper tidal belts were investigated by the degrading bacteria agent The degradation of oil pollution was evaluated by analysing the degradation rates of C17 / hopene, C18 / hopene, and total alkane and total aromatics. The study found that the degradation rate of the degrading bacteria group DC10 to petroleum under laboratory conditions was higher than that of the constituent strains. The degradation rate of petroleum in one week was about 60% higher than that of the control, and it could degrade most alkanes and aromatics.
Analysis of Bio-in-situ Remediation Technology of Petroleum Contaminated Soil Based on Enhanced Electric Power
Authors: Zhao Jingang , Qi Guangfeng , Huang Shan , Gao Yan , Yan Zheng , Wang Xiaohui
Published: September 2020

In order to explore the strengthening effect of the electric field on biodegradable oily soil, through designing 5 gradient electric fields of 0V / m, 50V / m, 100V / m, 200V / m, and 250V / m, the growth and reproduction changes and behavioural dynamics of the electric field on organisms were studied the impact of learning. On this basis, the effects of electric field on the oil-lowering ability of organisms, the accompanying migration characteristics of populations, in situ active replenishment, and the distribution characteristics of nitrate ions and sulphate ions in oily soils were analysed. The results show that when the electric field strength is 100V / m, the biological growth and reproduction rate is the highest, the number of bacteria is the largest, and the loss of nitrogen nutrients is the smallest; the effect on the oil-reducing ability of the oily soil is accordingly coupled effect> single bacteria effect> single electricity effect It shows that the effect of electric field coupling bioremediation technology on oily soil is remarkable.
Preparation and performance of sludge-based desulfurizer by calcification
Authors: Song Xin , Ge Shifu , Li Yuan
Published: September 2020

The study used Ca/TS, water content, particle size and additives as control variables to prepare sludge-based desulfurizers. An experimental setup was built up to investigate the desulfurization effect. The 5-factor and 4-level orthogonal experimental scheme was designed to study the factors affecting the sulfur capturing efficiency of sludge-based desulfurizer. The effects of the types and ratios of additives on the sulfur capturing rate were studied with sodium carbonate, iron oxide and acetic acid as additives. The result showed that the optimal condition to produce calcification sludge desulfurizer (CSD) was: 0.425~0.6mm of diameter desulfurizer, moisture content of 30%, and ferric oxide ratio of 6%. The optimal desulfurization condition was the combustion temperature of 900 °C, calcium to sulfur molar ratio of 2.0 and the SO2 concentration of 1%. In this case, the sulfur capturing ratio was 61.86%, higher than that of pure calcium oxide. The pore structure of the sludge-based desulfurizer showed that compared with the porosity of pure calcium oxide of 32.02% and the specific surface area of 19.80 m2/g, the sludge-based desulfurizers increased to 36.94% and 28.32 m2/g, respectively. The degree of irregularity is low, which greatly improves the sulfur-fixing effect of the sludge-based desulfurizer.
Research on Resident Garbage Sorting and Recycling System Based on Green Environmental Protection Technology
Authors: Yu ChuanDong , Du Nan
Published: September 2020

Separate collection of garbage is an important means of reducing, harmless and recycling urban household garbage, and is of great significance to the growing garbage threat. The current urban garbage collection work is gradually carried out, but the actual results of the corresponding classification collection work are not obvious. This article studies the classification and collection mode of residential area based on the concept of environmental protection priority, and hopes to provide a reference for the study of garbage collection mode.
The Effects of Water Resource Restrictions on Sustainable Development in Semi-Arid Regions: A Case Study of Tongliao City, Inner Mongolia
Authors: Xu Dongping , Liu Yanhong , Zhao Bo , Xue Xiaojie , Zhu Jiwei
Published: September 2020

Water resource is a constraining factor in the sustainable development of semi-arid areas (SAAs). In order to study the constraining effects of scarce water resources on the sustainable development of SAAs more accurately, this paper selects the typical representative of SAAs, Tongliao City, as the case study area, and water resource System Dynamics (SD) model was established for the City that described the constraints and the resultant restrictions on sustainable development. The operation of the SD model showed that under the traditional development path, Tongliao City maintained rapid economic growth even though restriction of its water resources had a significant constraining effect. The simulation showed that in 2018, the first water shortage occurred in Tongliao City and the situation of water shortage was getting worse. By 2030 the water shortage will reach 28.9%. Industrial production and urban living will utilize all of the available ecological water and, in consequence, the natural environment will seriously deteriorate. Analysis of the simulation results has shown that, under the existing development path, the structure of water consumption in Tongliao City is irrational. Continuation of the established development model will result in a drastic shortage of water resources, and will curtail significantly the sustainable development of the city. The results of the present study have demonstrated conclusively that shortage of water resources has become the key factor that will restrict the sustainable development of SAAs. Thus, in the future, development methods should be changed to improve the utilization efficiency of water resources in order to achieve sustainable development in SAAs.
A comparative study of seagoing waterway between Hangzhou Bay and world-class bays
Authors: Pan Dongzi , Li Ying
Published: September 2020

Zhejiang provincial government proposed the construction of Zhejiang Greater Bay Area (GBA) in 2017. River-sea intermodal transport is the core competitiveness of the bay area (BA). Compared with the sea shipping of the world-class BAs, the seagoing waterway of Qiantang River has long been the short board of regional economic development. Based on the core cities of the three BAs in the world, this paper makes a comparative study on the seagoing waterway of the Qiantang River Estuary and Hangzhou Bay, summarizes the history and current situation of the research on the seagoing waterway of the Qiantang River, and gives suggestions on the seagoing waterway of Hangzhou Bay with reference to the development path, strategy and successful experience of the world famous BAs.
GaN nanowires decorated with Pd for methane gas sensor
Authors: Li Shida , Huang Hui , Zhao Danna
Published: September 2020

In this study, palladium (Pd)-decorated gallium nitride (GaN) nanowire have been prepared for room-temperature methane (CH4) gas sensors. The material was fabricated via MOCVD method combined with subsequent magnetron sputtering process and characterized by SEM technique. The SEM images indicate that the presence of different thickness of Pd film on the surface of the nanowires. When used for methane gas sensing, with the assistance of UV light, the 10nm Pd-decorated GaN nanowire sensor has the highest response to 200ppm methane, which were about 2 times higher than that of pure GaN samples. What’s more, 10nm Pd-decorated GaN sensor also has the lowest detection limit (20ppm) and the shortest response time (<10s). Thus, the application of Pd-GaN nanowire as methane gas sensor will have board prospects.
Multi-class weather classification based on multi-feature weighted fusion method
Authors: Li Zhiqiang , Li Yingxiang , Zhong Jiandan , Chen Yongqiang
Published: September 2020

Weather classification, which aims to prevent extreme weather from affecting people’s life and property, has recently become a significant interest in image classification. The traditional weather recognition methods always adopt expensive sensors and human vision as auxiliary. However, they perform not very well. Although the Convolutional Neural Networks (CNNs) have shown the state of the art performance on image classification recently, for weather classification, it is a challenging task because it relies on weather-sensitive cues such as the various illumination, contrast and the clutter background of the weather images. To address this issue, a method named multi-feature weighted fusion is presented in this paper. Firstly, we extract the well-chosen weather-specific features such as haze, contrast, brightness, etc., and then fuse these features with data-driven CNNs feature to form high dimensional vectors. Moreover, to increase the recognition performance, various weights are adopted for weather-specific features and CNNs feature to learn an adaptive five-class weather conditions classifier. The extensive experimental results demonstrate that the proposed method obtains better performance than the method using CNNs feature alone.
Prediction of PM2.5 value by BP artificial neural network in honeybee colony
Authors: Ai Jiaoyan , Gong Wenyang
Published: September 2020

In this paper, propose a BP artificial neural network optimized by artificial bee colony algorithm with a PM2.5 value for the current Nanning area. In this paper, aiming at the shortcomings of BP neural network prediction, the global optimization performance of artificial bee colony algorithm is used to provide the optimal global initial value for BP neural network and avoid the neural network falling into local optimization. To make the prediction model more accurate. PM2.5 is a small part of the atmospheric chemical composition, which has a great impact on the air quality and thus on the human body. With people’s attention to their own health nowadays, it is of great practical significance to predict the PM2.5 content in a certain period in the future. The results show that the average square error and average relative error of the prediction of PM2.5 content based on BP artificial neural network are only 1.25% and 2.46% respectively. BP artificial neural network based on bee colony can be well applied to the prediction of chlorophyll a content, providing a reference for the prediction of PM2.5 content in a certain period in the future.
Bibliometric Analysis of the Synthesis of Nanocatalyst (1999–2018)
Authors: Feng Lisha , Chen Qiu
Published: September 2020

Taking the Web of Science database as the data source, and taking 3047 SCI documents published in the field of nanocatalyst synthesis published between 1999 and 2018 as the analysis objects, the annual publication volume, space-time distribution, research institutions, and authors of the relevant documents were analyzed. Use the visualization software VOSviewer generated literature keywords co-occurrence clustering view, keywords co-occurrence chronology view, and keywords co-occurrence clustering density view, analysis of the research in the field of countries are China and Iran. The research focus is mainly on the design and synthesis of new nanocatalysts, so that the morphology and particle size of nanoparticles can be well controlled, so as to improve the catalytic activity and selectivity of nanocatalysts, and to study the catalytic reaction mechanism. The research frontier mainly focuses on the efficient and green synthesis of nanocatalysts, especially the recycling and reuse of nanocatalysts. The development and utilization of new nanocomposites and nanophotocatalysts with photocatalytic properties, as well as the performance research of other sizes of nanomaterials such as nanoclusters, nanowires, and nanosheets.
Application and Research of Analytical Chemistry in Food Inspection
Authors: Kang Hongling , Yan Rong , Guo Wenjie , Zhang Yingying , Wang Wei , Chen Lihua , Liu Yinan
Published: September 2020

Analytical chemical methods in food production are widely used in food safety testing. High performance liquid chromatography is a type of chemical analysis method that is also commonly used. To this end, the paper will use the application of high-performance liquid chromatography in food detection as an entry point to study the application of analytical chemistry in food detection. High performance liquid chromatography (UPLC) is characterized by stability, ease of use, variable sensitivity and selectivity. It shows better chromatographic resolution, more sensitive analysis, shorter analysis time, and can reduce solvent consumption This article provides a brief overview of the application of UPLC in the rapid detection of dairy additives, food additives, contaminants, mycotoxins, and illegal chemical additives.
Research on the properties of modified water treatment agent for white pulp of pomelo peel
Authors: Liu Yinan , Li Chengsheng , Liao Bing , Kang Hongling , Wang Man , Yan Rong
Published: September 2020

a water treatment agent for white pulp of pomelo peel was developed using commercial Pomelo as raw material, which laid a foundation for the further development and utilization of Pomelo Peel. Indeed adsorption Cu2+, Fe3+ as an index, the effect of modification on the basis of single factor experiment research on the use of sodium hydroxide concentration, pH, adsorbent, adsorption process the time required to the influence of factors such as the adsorption effect, orthogonal experiment as the main experimental method to determine the modification of pomelo peel white pulp desorption process using the adsorption effect of again. The results showed that the modified water treatment agent had higher adsorption efficiency for Cu2+ and Fe3+ in water, and had favourable reabsorption ability, it can be reused and has higher adsorption efficiency. The developed water treatment agent for white pulp of Pomelo Peel has laid a foundation for the adsorption of Cu2+ and Fe3+ in water, the efficient utilization of white pulp of pomelo peel and the invention of production equipment.
Simulation of indoor pollutant diffusion concentration field in passive house based on CFD software
Authors: Wu Huangyuan
Published: September 2020

Due to the good air tightness of the passive house, once there are poor quality furniture materials in the room, it is easy to cause indoor formaldehyde pollution which do harm to people’s health as well as the quality of their life. This article introduces the CFD software to simulate the change of indoor formaldehyde concentration in the passive house when opening the fresh air system to ensure indoor air quality and to employ a new way to the better quality of life of residents. The function of CFD software and two fluid dynamics control equations are introduced in the essay, and the finite difference method of control equation discretization is studied as well. Based on CFD software, the case is analyzed, under which the indoor formaldehyde concentration changes, according to different fresh air system inlet locations. The simulation results show that when the two air outlets of the living room are on the side of the sofa and TV cabinet, and the air outlet of the bedroom is in the corner, the formaldehyde purification rate is better, which a more reasonable air supply method is.
Study on application of regional ecological risk assessment during the development and utilization of Chu Island
Authors: Ma Long , Zhang Ying , Ma Zhizhong
Published: September 2020

Taking natural disaster risk problems in the uninhabited island ecosystem as the main research object and combined with the features of uninhabited island ecosystem, regional ecological risk assessment was carried out with the relative risk model (RRM) taking an exemple of Chu island. According to ‘Weihai Chu island protection and utilization planning (2011~2020)’, the study area was divided into three risk areas, which are key protected area, basic facility area and ecological tourism area. Birds, sea cucumbers and their habitat as the receptors for Chu island ecological risk assessment was selected, and combined with the regional sources of risk occurrence probability, the range and intensity, storm surge, drought and cold wave were the main risk sources in the region. The exposure response relationship of “risk source—stress—habitat—ecological end point” in each risk area was analyzed. We pointed out: (1) in the development and utilization process of Chu island, storm surge is the most influential source of risk in the region, and its influence is far higher than drought and cold wave; (2) the island land resources, especially the vegetation, affected by the risk source is the largest, followed by water and the tidal flat; (3) As the two main functional areas in the development and utilization process of Chu island, the relative risk value of basic facility area and ecological tourism area, which is 1.05 and 0.97 respectively, is larger than key protection area, and its relative risk value is 0.5.
Application of ESMD Method to the Runoff Process in the Arid and Semi-Arid Area
Authors: Wu Kai , Li Lingqi , Zhang Nan
Published: September 2020

The ESMD method was good at finding the optimal adaptive global mean fitting curve, which was superior to the common least-square method and running-mean approach. It was the new development of the well-known Hilbert-Huang transform and could be used effectively in the science researches and engineering applications associated with data analysis from atmospheric and oceanic sciences, informatics and so on. Take the runoff process of West Liaohe River as an example, the test on the observational data indicated that this approach was very feasible.
Automatic water quality arsenic element detection device based on internet of things
Authors: Wang Yujie
Published: September 2020

Arsenic contamination in groundwater is an outcome of anthropogenic or natural sources. The determination of arsenic in water is of crucial importance. Therefore, a portable and integrated device is designed for arsenic detection. Based on ESP32-cam, the reaction is proceeded in automation, accompanying colorimetric detection of copper sheet. Therefore, information concerning the concentration of arsenic will be received by people through the Internet.
An Improved Hybrid Index Structrue for Per-Calculated Downwash Flow Field Visualization
Authors: Ni Ming , Wang Hongjie , Li Xingcheng , Liao Yilin , Fu Lin
Published: September 2020

With the application of aerial plant protection technology in field spraying, how to intuitively and quickly obtain the impact of propeller downwash flow field on droplet deposition has become an important aspect of field management. The unstructured grid is used for the propeller rotation area, the structured grid is used for the surrounding fluid domain; After the mesh generation, use Fluent software to iteratively calculate the propeller-fluid domain mesh model until the calculated residual values converge, In this way, the aerodynamic parameters of the propeller and the discrete grid value distribution of the surrounding fluid domain are obtained; In the OpenGL environment, use SPH method to establish the physical attribute particle model of the droplet, Create a mixed space domain of octree and KD tree at the same time, import pre-calculated grid numerical distribution data, and initialize the octree and KD tree in the fluid domain; Finally, the hybrid structure index algorithm is used to obtain the changes of the flow field around the particles, and the motion is solved based on Newton’s law to obtain the multi-particle flow field motion trajectory with high frame rate.
Application and Research of GPS Digital Image Measurement Technology in Landslide Disaster Monitoring and Prediction
Authors: Fu Jundong , Zhang Guangcheng
Published: September 2020

This article mainly uses GPS high-precision satellite positioning technology, using low-power, long-term maintenance-free power supply system monitoring equipment in the field, to establish a scalable and expandable landslide displacement deformation monitoring system. The system uses a combination of real-time monitoring, real-time processing, and timing processing to detect mountain deformation in time. Taking the monitoring of landslide accumulation area of a nuclear power plant as an example, through the monitoring data and the actual situation on the spot, the disease symptoms of the slope were discovered in time, and the development status of the disease was grasped. At the same time, preventive measures for related disease remediation were provided, especially when the climatic conditions changed the dynamic changes of the slope at the time, forecast the occurrence and development of the main diseases of high-risk slopes, analyze and predict the possibility of sudden diseases, do well in advance control, and reduce unnecessary losses.
Survey of Macrobenthos on Multiple Lithofacies in the Intertidal Zone of Jimo in spring and autumn
Authors: Li Tianhao , Sun Zhixian
Published: September 2020

Jimo is a district under the jurisdiction of Qingdao City, located in the southern Jiaodong Peninsula and bordering the Yellow Sea. The project is to investigate the distribution of benthic animals in the scattered lithofacies environment when the overall environment of the intertidal zone is sandy tidal flats, and to make a preliminary statistics of the species in the region, in October 2018 and April 2019, two benthic animal surveys were conducted at the same sampling point in an intertidal zone near Aoshanwei Town, Jimo District, Qingdao. A total of 32 species of macrobenthos in the intertidal zone were collected in six sections. There are obvious differences in ecological data in different lithofacies sections and winter and summer. The results of this survey can provide references for the study of macrobenthos in special lithofacies.
Resource utilization research on construction waste based on game theory
Authors: Lai Xiaomei , Xiong Yao , Chen Yi
Published: September 2020

The resource utilization of urban construction waste has become one of the important topics of scientific research. Construction waste resource companies are not only the key to the reuse of construction waste, but also the key to the government’s policy on construction waste resource development. A Starkberg model has been constructed in this paper to study the response behavior of governments and construction waste resource companies to maximize their own interests under a reward and punishment mechanism.
The operation analysis of the CCHP driven by Gas-steam combined cycle
Authors: Liang Junyu , Yuan Xingyu , Gu Jiangqi
Published: September 2020

In combined cooling heating and power system, the gas-steam combined cycle is gradually used more and more. The common operation mode in CCHP is mainly to determine heat by electricity and heat by electricity. This paper defines an index indicator and analyzes the difference between the two operating modes in different intervals through the system energy supply interval chart, finally analyzes the difference in the indicators between the two operating modes through the actual load method. It is concluded that in winter operating conditions, the following the thermal load (FTL) operation mode is better; in summer operating conditions, the indicator of following the electric load (FEL) is better; during the transition season, the value of PEC is better in the case of following the thermal load.
An Optimal Droop Control Method of DC Micro-grid with Local Loads
Authors: Gong Renxi , Liu Zihao
Published: September 2020

An optimal droop control optimization method is proposed of the DC microgrid. First, a modeling of the DC micro-grid is made based on the idea of model equivalence. And then, the traditional particle swarm optimization (PSO) is improved by introducing adaptive learning factors and inertial weights. Finally, based on the improved PSO algorithm, the droop parameters are optimized to optimize the system performance. The simulation results show that even under the dual effects of line impedance and local load, the system can still achieve a high accuracy of current sharing and has a significant suppression effect on the bus voltage deviation.
Study on Calibration Method for Electronic Transformer Test Set
Authors: Huang Tianfu , Wu Zhiwu , Wang Chunguang , Wu Xiang
Published: September 2020

A method for calibration of electronic transformer test set is proposed. The calibration principle of analog function and digital function of electronic transformer test set is analyzd in detail. And the uncertainty evaluation of the ratio error and phase error of electronic transformer test set is introduced. The proposed method can evaluate the measurement performance of electronic transformer test set as a whole. And the method can be used as a reference for calibration of electronic transformer test set.
Research on the Ultimate Performance of Organic Rankine Cycle Experimental System
Authors: Wang Haoguang , Zhao Jiayuan , Bian Yongning
Published: September 2020

At present, fossil energy is depleted and environmental pollution is severe. Based on this context, renewable energy has begun to be paid attention to, among which ocean thermal energy conversion (OTEC) has received more and more attention. In this paper, the organic Rankine cycle (ORC) wasted heat power generation system is built. Through the experimental method of controlling variables, the effects of the temperature of the heat source and the flow rate of the working fluid on system performance are explored. The results show that: when the flow rate of the working fluid is constant, as the temperature of the heat source gradually increases, the generating power of the ORC system increases rapidly first and then increases slowly. When the temperature of the heat source remains unchanged and the flow of working fluid gradually increases, the generating power of the ORC system increases first and then decreases. At different temperatures, there is a corresponding optimal working fluid flow that maximizes the system output power, and the higher the temperature, the greater the system output power. Through experiments, it is found that the maximum generating power of the ORC system is 667.55W, the corresponding heat source temperature is 120°C, the working fluid flow is 470.64 kg/h, and the frequency is 90 Hz. The experiment also found that the relationship between the pulse damper frequency and the working fluid flow is linear.
Investigation on vibration characteristics of ship shafting under uncertainty
Authors: He Xiaoliang , Shang Mingji , Li Guobing , Xing Pengfei , Gao Honglin , Qiu Shihao , Lu Lixun , Zhang Hongpeng
Published: September 2020

In order to investigate the influence of random uncertainty on the vibration characteristics of the ship shafting system, a nonparametric model that adds the data uncertainty and model uncertainty was constructed, and the system’s frequency response function and vibration response were calculated. The results show that the random uncertainty will make the frequency response function and vibration characteristics of the ship shafting system fluctuate. With the increase of random uncertainty, the degree of fluctuation of the system gradually strengthens. The study demonstrates that it is essential to consider the influence of random uncertainty during ship shafting designing and vibration calculation.
Economic Capacity Allocation of Grid-connected Microgrid Based on Improved Hybrid Genetic Algorithm
Authors: Guo Yu , Lv Hongfang , Wang Bingkun
Published: September 2020

For the wind and solar diesel storage grid-connected microgrid, in order to meet the minimum investment cost of the microgrid at the initial stage and have certain economic benefits. The objective function of this paper is the annual average economic cost, the number of each micro-power source is used as the optimization variable, the constraints of micro-grid operation are considered, the capacity optimization configuration model of grid-connected micro-grid is established, and then the improved genetic algorithm can be used to solve this problem. Finally, the annual average economic cost, the utilization rate of new energy and the redundancy rate are used as evaluation indicators. By comparing the configuration results of genetic algorithm, wolf pack algorithm and mixed wolf pack genetic algorithm, the capacity allocation scheme of microgrid under economic indicators is obtained.
A Method for Identifying the Friction-induced Vibration Based on The Maximum Information Coefficient
Authors: Xing Pengfei , Qiu Shihao , Li Guobin , Gao Hongtao , Gao Honglin , He Xiaoliang , Shang Mingji , Zhang Hongpeng
Published: September 2020

A reciprocating running-in experiment is carried out on a friction-abrasion testing machine with disk-pin friction pair. The friction-induced vibration (FIV) signals measured in the experiments are identified by the maximum information coefficient (MIC) method. Experimental investigation shows that the association strength between the identified tangential and normal FIV signal is in a positive correlation with the coefficient of friction. The two-directional FIV signals distribute in the same frequency range, and their root mean square (RMS) variations are in similar accord to the changing of the coefficient of friction and can indicate the wear state evolution of the disk-pin friction pair from the running-in wear to stable wear. Therefore, the FIV signals can be identified by the MIC method.
Study on composite Control of Three-phase three-level Vienna rectifier
Authors: Ai Meihui , Yang Dichun , Liang Zhe
Published: September 2020

This paper analyzes the working principle of The Vienna rectifier and the control method of the current inner ring. In view of the low precision and poor current tracking effect of the traditional single PI current loop control method, a new compound control strategy combining PI control and repetitive control was proposed. This method not only keeps the advantage of fast response speed of PI control, but also has the ability of harmonic suppression and anti-interference of repetitive control. The qualitative analysis of the composite control method and the full analysis of the current inner loop controller using the composite control were carried out. Finally, the simulation was carried out in MATLAB. The simulation results proved the correctness of the proposed control strategy PI plus repeated composite control strategy.
Research and Application of Unit Automatic Monitoring Integration Based on Grid Side in Gas Turbine Power Plant
Authors: Zhang Li , Zhang Fang , Wei Yu , Wang Tiankuo , Yu Longfei
Published: September 2020

In view of the original independent grid-related parameters scattered in electrical and thermal equipment, such as the AVC, PMU, primary frequency and DCS, this paper improves the operation reliability of grid-connected power plant equipment, achieves the visualization and retrace ability of grid-related parameters through the centralized monitoring, multidimensional, real-time tracking, intelligent alarm, report customization and log function. Secondly, using these real-time big data, the primary frequency regulation index of the unit is calculated and analyzed in real time, which improves the authenticity and correctness of the primary frequency regulation and AVC, thus to ensure the regulation performance and the stability of the output power frequency.
Optimal scheduling of cogeneration microgrid with wind energy and energy storage devices
Authors: Huang Lingxuan
Published: September 2020

Aiming at the optimal scheduling of cogeneration microgrid, a microgrid structure including wind energy, energy storage device, solar thermal power station, gas turbine and waste heat boiler is proposed. Based on the uncertainty of wind power output and load forecasting, according to beta distribution wind power output and normal distribution load forecasting, the CHP microgrid optimal scheduling model of photothermal power station is established and solved by genetic algorithm. Finally, the minimum operation cost of the system under different confidence levels is discussed. The results show that the minimum operating cost of the system can be significantly reduced by adding wind power generation into the microgrid structure, and the relationship between the confidence level of load forecasting and the minimum operating cost of the system is studied.
Research on Transformer Relay Protection System Based on Ubiquitous Power Grid Technology
Authors: Wang Lei , Li Yan , Zhu Hao , Huang Li , Huang Zhaoting , Zhou Jinqiao
Published: September 2020

Things are ubiquitous power system as the core power, combined with intelligent sensor terminal, a communication network, the network flow system more complicated artificial intelligence technology and internet cloud configuration, having a holographic perception, ubiquitous connection, open sharing, innovative features fusion. Where the grid-based networking technology, system components paper analyses imprecision transformer relay fuzzy theory, a reliability model corresponding relay, and more truly reflect the reliability of the system.
Research on Evaluation Method of Coal-to-Electricity Project Considering Load Access Mode
Authors: Ma Dongmei , Zou Gang , Guo Jian , Li Jiefu , Kan Zhongfeng , Wang Chuanyu
Published: September 2020

With the aggravation of air pollution, some cities in northern China have carried out the coal-to-electricity project in succession, replacing the traditional coal-fired heating with clean and pollution-free electric energy in winter heating period. In the process of project promotion, the regenerative electric boiler is widely used. In this context, this paper first analyzes the operating characteristics of regenerative electric boilers, and establishes a coal-to-electricity project evaluation model from the perspective of heating energy type conversion and distribution network construction based on optimization models that take into account different start-stop modes. And in the part of simulation examples, the actual data is used to evaluate and analyze the different load access methods, and the results verify the effectiveness of the model proposed in this paper. It can also guide the engineering practice and provide theoretical support for the introduction of DSM in the subsequent engineering.
Research on Implementation Methods of Power Grid Technology Supporting Energy Internet Construction
Authors: Li Xuyang , Li Juan , Li Lingyun , Guo Xinju , Kang Yanfang , Guo Xiaohan
Published: September 2020

The energy Internet is a complex multi-grid flow system, which is based on the power system, the Internet and other cutting-edge information technologies, with distributed renewable energy as the main primary energy and closely coupled with natural gas network, transportation network and other systems. The power grid technology has to develop to support the energy Internet construction. This paper discusses the changes and challenges in the asset environment, asset types, asset scope and asset risk under the energy Internet. Then the corresponding implementation methods of power grid technology to supporting energy Internet construction are put forward. The research results can provide reference for power grid companies to implement power technical innovation.
Mathematical research on the Crucial Factors Affecting Substation Engineering
Authors: Li Lingyun , Guo Xiaohan , Guo Xinju , Li Xuyang
Published: September 2020

The design plan of the substation engineering is crucial to the construction and operation of the substation. Reasonable mathematical analysis is helpful for the comparison and decision-making of the substation engineering in the early stage. In this paper, based on the parameter index of the 2016-2018 substation engineering, 24 factors affecting the substation engineering are selected, and a mathematical model is constructed for research. The study found five key factors that affect the substation engineering. The research results can provide reference for the scheme comparison and scientific decision-making of substation engineering.