bluuebunny/crossref_metadata_2025_split huggingface dataset:
Progress in Shale Oil Refinery Waste Water Treatment Technology
Authors: Yuting Fu , Changbo Li , Guozheng Zhao , Hui Liang , Shuo Wang , Hongzhu Xu 
Published: March 2021

AbstractShale oil refinery waste water was a kind of high-concentration organic waste water with many types of pollutants and complex components. It contained environmental pollutants such as petroleum, volatile phenols, organic nitrogen, naphthenic acid compounds and fused ring aromatic hydrocarbons. If it is discharged directly without treatment, it will cause serious harm to the environment, and it must be treated before it can be discharged. At present, the treatment methods of shale oil refinery waste water mainly include physical treatment, chemical treatment, physical and chemical treatment and biological treatment. This paper studied the treatment technology of shale oil refinery waste water.
Health risk assessment of heavy metal pollution in farmland downstream of Lead-zinc smelter
Authors: Liu Jingjing , Ma Yanlong , Zhang Songlin , Yao Yiming , Wang Xiaoping , Chen Tao , He Youxiang , Qi Jianhong 
Published: March 2021

Abstract
In order to investigate whether heavy metals in farmland soils downstream of the abandoned lead-zinc smelter are harmful to local human health, the Plum blossom and diagonal sampling methods were used to collect the soil samples of cultivation layer (0∼25cm) from the farmland soils downstream of the abandoned lead-zinc smelter, Hui County, Gansu province, P. R. China at the end of December, 2019. The US EPA health risk assessment model was used to analyse the impact of the selected five heavy metals (Pb, As, Cr, Hg and Cd) on the physical health of local residents. The results showed that the average value of the total non-carcinogenic risk index of these five heavy metals in the soil of the three plots in the study area was 6.71 for children and 4.27 for adults, both of which were greater than 1, it meant that there were non-carcinogenic risk to both children and adults. The average cancer risk index of these five heavy metals for children was 4.49×10−4, and that for adults was 2.51×10−4, both of which are greater than 1×10−4, which is a notable cancer risk for local residents. The results provided a significant support for remediation and treatment of heavy metal contaminated farmland.
Plastic Rooftop Rainwater Harvesting Technology in Arid Greenhouse Vegetable Cropping System in Anding, Gansu, China
Authors: Wang Junde , Jin Yanzhao , Zhou Luwen 
Published: March 2021

Abstract
Several greenhouse vegetable cropping models have been established to deal with the natural, arid, water deficit weather condition in Anding District. Irrigation requirement is computed based on various irrigation schemes. Rainwater harvesting technology is utilized to estimate the water collection amount with the greenhouse plastic rooftop using the water-balance rationale. Different water demand and runoff collection surface needs are determined based on the supplemental irrigation requirements of the various vegetable cropping models using regulatory benefit principle. The required capacity of rainwater storage is then evaluated for each cropping model. These results provide valuable references for rainwater harvesting technology using greenhouse plastic rooftop for agricultural production.
Clean synthesis of ethyl methyl carbonate using Mg-Al mixed oxide as catalyst
Authors: Liu Peng , Li Haiyan , Zhou Xi 
Published: March 2021

Abstract
A series of Mg-Al mixed oxides were prepared by the calcination of Mg-Al layered double hydroxides with various Mg/Al molar ratios (2-6) at different temperature (400-700°C), and used as catalyst for the transesterification synthesis of ethyl methyl carbonate (EMC). The results showed that Mg/Al molar ratio and roasting temperature had remarkable effect on the activity of Mg-Al mixed oxides. Among investigated catalysts, MgAlO-3-600 showed the highest activity. And 51.6% EMC yield can be obtained at 100°C within 1.5 h. In addition, MgAlO-3-600 could be reused at least 4 times without obviously loss of its activity for the EMC synthesis.
Study on Impact of Industrial Structure Upgrading on Energy Efficiency in the Yellow River Basin—Based on the data of 2001—2019
Authors: Juan Liu 
Published: March 2021

Abstract
The Fifth Plenum of the 19th Central Committee of the Communist Party of China stressed the need to improve the living environment, achieve high-quality economic development, rationally allocate energy resources and improve the energy use efficiency during the 14th Five-Year Plan period. The Yellow River Basin is an important energy base in China, and the energy use efficiency directly affects the ecological protection and high-quality development of the Yellow River Basin. Based on the analysis of the relationship between industrial structure upgrading and energy efficiency, and the panel data of nine provinces in the Yellow River Basin from 2001 to 2019, this paper empirically analyzed the impact of industrial structure upgrading on energy use efficiency in the Yellow River Basin. Results showed that: On the whole, industrial structure upgrading positively promoted the improvement of energy efficiency in the Yellow River Basin; from the view of sequential variation, the overall energy use efficiency in the Yellow River Basin was on the rise; from the view of spatial difference, the energy use efficiency of provisions in the middle and upper reaches of the Yellow River Basin was relatively low, and the energy use efficiency in the lower reaches showed significant advantages.
Research on Double-Circuit Direct Current Control System Based on PSCA
Authors: Maalla Allam , Jia Qiwei , Zheng Donghua , Ye Lizhu 
Published: March 2021

Abstract
This article introduces the double-circuit Direct Current system on the same tower, and then analyses the hierarchical structure of the double-Circuit Direct Current Control System Based on PSCA. For the power control, the double-circuit power coordinated control strategy and the low-load reactive power control strategy are made in-depth research and analysis, and then made a simulation model of the double-circuit coordination of the double-circuit DC system on the same tower based on PSCA. Finally, based on the existing dual-circuit power control function of the system, it can reduce the ground electrode current and maintain the reactive power balance of the converter station to optimize the distribution coefficient of the two-circuit DC power, and effectively increase the reactive power in the conversion process.
Study on simulation and prediction of environmental risk material leakage in an Equipment Manufacturing Industrial Park
Authors: Zhang Nan 
Published: March 2021

Abstract
From the perspective of environmental risks, the groundwater pollution, surface water pollution, and fire and explosion scenarios were simulated and predicted with the analytical method in an equipment manufacturing industrial park in Shenyang. The results showed that: after the accident, the maximum migration distance of COD pollution factor leakage in groundwater in the next ten years could reach 1500m, and its peak concentration was 786.35mg/L; the leakage of WSCLC wastewater treatment system would affect Xihe river, and its hazard range mainly concentrated within 17m downstream of the discharge port; the vapor cloud explosion of the HCBM enterprise oil tank caused slight damage to the equipment, and the maximum radius of minor injuries was 15.3m.
Research on High-Voltage Transmission System Operation on the Same Tower
Authors: Maalla Allam , Jia Qiwei , Ye Lizhu 
Published: March 2021

Abstract
The high-voltage DC adopts the simulation idea of a two-circuit system on the same convertor. The current DC system availability indicators were insufficient and proposed two reliability indicators, operating utilization and operating availability. At the same time, the active planned outage mode and the activities planned energy unavailability rate index was proposed, and the reliability evaluation program algorithm analysis based on programming developed to verify the feasibility of the power outage maintenance optimization mode, and at the same time provide certain guidance and reference significance for the subsequent design work of the same type of research. A calculation algorithm for evaluating the impact of the outage DC on the reliability of the system is proposed to calculate the value of the transmission system.
Effect of Selenium on the growth and Cadmium accumulation of tomato seedlings in low temperature and low light
Authors: Zhong Yufeng , Xia Tianqi , Peng Sihan , Ma Yaoqing , He Zhongqun 
Published: March 2021

Abstract
In this study, we used two tomato cultivars ‘Medium Vegetable 4’ and ‘Middle Mix 9’ as materials, applying Na2SeO3 to the soil to study the effect of external Selenium (Se) on the growth and Cadmium (Cd) accumulation under low temperature (18/12 °C, day/night) and low light (100 μmol⋅m−2⋅s−1). Results show that Se can significantly reduce the Cd accumulation in root, leaf and stem and promote the development of tomato under Cd stress. Under low temperature, Se can enhance cold tolerance through increasing the chlorophyll content, POD activity, soluble sugar and soluble protein content and decreasing the MAD content of two cultivars. Our study provides direction for tomato cultivation under low temperature and low light.
Active and Reactive Power Coordinated Optimal Dispatch in Active Distribution Network Considering Spatial-temporal Correlation of Wind Power
Authors: Qu Hanbing , Yang Fu , Lin Qirong , Jia Yujian 
Published: March 2021

Abstract
The high penetration of renewable energy increases the difficulty of optimal dispatch and brings challenges to the safe and economic operation of the distribution network. This paper proposed an active and reactive power coordinated optimal dispatch model, and the spatial-temporal correlation of wind power output is considered. Firstly, the copula function and non-parametric estimation methods are adopted to model the spatial-temporal correlation of wind power. Secondly, the parameters in the copula fitting function are estimated based on the maximum likelihood estimation method. Besides, the active power and reactive power outputs of various flexible resources in the active distribution network (ADN) are coordinated. The proposed model can significantly reduce the network loss of the ADN, improve efficiency, and optimize the power purchase plan. A case study on a modified IEEE 33-bus system verified the effectiveness of the proposed method.
Experimental study on phosphorus removal of water by Zn/Mg/Al layered double hydroxide
Authors: Zhiyong Huang , Hongbo Liu , Xin Li 
Published: March 2021

Abstract
Zn/Mg/Al layered double hydroxide (Zn/Mg/Al-LDH) was prepared by co-precipitation method. The structure of Zn/Mg/Al-LDH was characterized by XRD. The results show that the samples have typical hydrotalcite structure. They were used as adsorbents to remove phosphorus from wastewater. The effects of pH value, phosphorus concentration, adsorbent dosage, oscillation intensity and reaction time on phosphorus adsorption capacity were investigated by single factor control variable method. The results show that the adsorption equilibrium of Zn/Mg/Al-LDH can be reached after 24 h. The optimal experimental conditions are as follows: stirring rate is 180 R/min, pH value is 6, and reaction temperature is 50 °C. Under above conditions, when the initial phosphorus concentration is 50mg/L, the adsorption capacity of Zn/Mg/Al-LDH for phosphorus is 54.10mg/g when the adsorption equilibrium is reached. When the initial phosphorus concentration is 200mg/L, the adsorption capacity is 69.70mg/g, and the saturated adsorption capacity is 70.37mg/g. In the simulated practical engineering application, when the discharged phosphorus meets the standard, the phosphorus adsorption capacity of Zn/Mg/Al-LDH is 37.09mg/g, and the phosphorus removal rate is as high as 99.76%.
Development and application of intelligent verification device for insulation (grounding) resistance meter
Authors: Yang Hongliu , Wang Shaoran , Dong Gang , Ni Hongwei , Man Xiaoping , Du Guoguang , Cao Dekun 
Published: March 2021

Abstract
The intelligent insulation resistance meter realizes a verification device that can simultaneously verify the insulation resistance meter and ground resistance meter, which can provide the standard resistance value for the verification of insulation resistance meter and ground resistance meter. The automation of the verification device had been achieved by the intelligent insulation resistance meter. The resistance value could be automatically output after inputting the value of resistance by the keyboard, which reduces the time of manually adjusting the knob of resistance value. The original verification record and verification certificate will be generated automatically after verification. The application of wireless communication technology enables the wireless connection of computer, automatic resistance box and printer.
Interactive Device for Publicizing Global Desertification Issues Based on the Open-source Programming Language
Authors: Fan Yuning 
Published: March 2021

Abstract
This research primarily applies Processing, a framework language for image-processing and Arduino, an open-source electronic prototyping platform to achieve human-computer interaction. The communication between Arduino and Processing completes the combination of software and hardware, thus presenting widespread application and strong visual expression. Moreover, through employing programming languages, designers and artists can create high-quality interactive device art, freely turning their ideas into reality. With the core focus on the global desertification, this research aims to design and produce an interactive device for publicizing the hazards of desertification via connecting hardware (a hand pressure bellow, light strips and wind sensors, etc.) and screen images which can show the continuous spread of desertification across the globe.
Study on air pollution control under the influence of energy policy in Shanxi Province
Authors: Gong Guoli , Yao Lin , Ren Lixia 
Published: March 2021

Abstract
At present, China’s resource constraints are becoming tighter and environmental problems are serious. Shanxi province’s energy policies implementation has a huge impact on the ecological environment. This paper focuses on the emission of air pollutants from coal-fired power generation, coal chemical industry, biomass power generation, coal bed methane power generation, as well as the impact of emission reduction measures such as "coal to electricity" and "coal to gas" on the atmospheric environment in Shanxi Province. In 2015, coal power, coal chemical and other energy-related industries in Shanxi province emitted 429,800 tons of sulfur dioxide, 348,000 tons of nitrogen oxides and 364,400 tons of dust, accounting for 38%, 37% and 25% of the province’s industrial emissions respectively. After the strict implementation of energy policies, the emissions of air pollutants SO2, NOx and dust from energy-related industries should be 121,500 tons, 236,100 tons and 19,300 tons respectively in 2020. Emission of air pollutants SO2, NOx and dust from energy-related industries should be reduced by 72%, 32% and 95% respectively in 2020 compared with that of 2015. However, we need to improve environmental access, tighten standards, strengthen environmental protection requirements in the energy industry, and continue to optimize the energy consumption structure.
Thermal Stress Analysis of Tube Plate and Tube Bundle of Multi-Tube Pass Spirally Corrugated Tubes Heat Exchanger
Authors: Zheng Yao , Wang Hehui 
Published: March 2021

Abstract
This paper analyses the thermal stress of multi-tube heat exchanger with spirally corrugated tubes using numerical simulations. The simulations are focused on the thermal stress of the tube bundle and tube plate, which have large temperature difference. In this paper, the heat exchanger design software HTRI is creatively used to calculated the temperature boundary conditions of the heat exchanger, which is difficult to obtain. Based on the indirect coupling method of ANSYS, the thermal stress intensity and thermal deformation between the tube bundle and the tube plate of the heat exchanger are caculated. And the calculation results can provide important references for the design and optimization of the heat exchanger.
Evaluation and analysis of electric vehicle’s ability to participate in power grid interaction
Authors: Dunnan Liu , Yuan Gao , Jiahao Liang , Zhixin Dong 
Published: March 2021

Abstract
As an important part of energy Internet carrier, electric vehicles can participate in many interactions with power grid. Firstly, this paper defines the positioning of electric vehicles in the power market. Based on the natural characteristics of electric vehicles, the constraints of disordered charging mode, orderly charging and discharging modes of vehicle network interaction are formulated. According to the evaluation requirements of electric vehicles participating in power grid regulation, the key parameters required are analyzed, and the ideal of power grid application interaction ability is analyzed with examples of different interaction modes effect. The example shows that the implementation of interactive management of large-scale electric vehicles can effectively suppress the power grid load fluctuations, and the benefits of using electric vehicles are also very considerable.
Comparative Analysis of Flexural Performance of Recycled Concrete Two-way Composite Slab and Ordinary Concrete Two-way Slab
Authors: Li Zhongwei , Jin Zhengchao , Fang Guangxiu 
Published: March 2021

Abstract
Based on the full-scale model test of ordinary concrete two-way slab and recycled concrete two-way composite slab with beam column support, the failure mode, stiffness and deflection changes of ordinary concrete two-way slab and recycled concrete two-way composite slab under concentrated load are analyzed, and the similarities and differences of bending performance of the two components under the same conditions are proposed. The results show that: under concentrated load, the failure mode and deflection change trend of recycled concrete two-way composite slab are basically the same as that of ordinary concrete two-way cast-in-place slab. The deflection of recycled concrete two-way composite slab increases greatly after cracking, which is related to the secondary stress. The bending stiffness of recycled concrete two-way composite slab before cracking can be calculated according to the elastic theory.
Study on the development law of advancing support pressure on fully mechanized caving face
Authors: Yanbin Zhang 
Published: March 2021

Abstract
In order to master the law of pressure manifestation in fully mechanized caving face, numerical simulation method is adopted to establish a physical and mechanical model for analysis. The results show that the load on the working face support is mainly the deformation pressure produced by the deformation of the top coal and the basic roof. Therefore, increase of the setting force and working resistance can improve the structural state of the roof and maintain the stability of the lower top coal. The supporting pressure in front of the working face is distributed approximately in a parabola, the peak is located at 4m to 8m in front of the coal wall, and the stress concentration factor at the peak point is 1.3 to 1.7.
Characteristics and Significance of Environmental Isotopes and Hydrochemistry in Surface Water and Groundwater in Jixi Wetland, East China
Authors: Yuyu Liu , Zhijie Yan , Xin Jiang , Yuqing Feng , Zhen Bian 
Published: March 2021

Abstract
The interaction between surface water and ground water (SW-GW) is an important mechanism affecting wetland hydrological process and its ecological environment. Jixi Wetland, located in the western part of Jinan City, East China, was selected as the study area. The surface water bodies include Yuqinghu Reservoir, Yellow River, Yufu River, Jiping Trunk Channel and Xiaoqing River. Groundwater includes shallow pore water and deep fracture karst water. To strengthen water management and protection and understand different water exchange in the Jixi Wetland, ion composition, stable isotopes (δ18O and δ2H) and deuterium excess were studied. The result shows that the characteristic cation is Ca2+, and the characteristic anion is HCO3
−. The main hydrochemical types of wetland water, Sedimentation Basin water and groundwater are HCO3⋅Cl - Ca⋅Mg water, the water of Jiping Trunk Channel is HCO3⋅Cl - Na⋅Mg type, the water of Yufu River is HCO3⋅Cl - Ca⋅Na type, and the water of Yellow River is HCO3⋅Cl - Na⋅Ca type. There is a hydraulic connection between SW-GW. The evaporation is strong in the surface water, while it plays a weak role in the groundwater. The dominant hydrogeochemical processes in the study area are lixiviation and cation alternating adsorption.
Multi-objective Optimization for Cruising Phase in Civil Aircraft’s Trajectory Planning
Authors: Wang Suxiao , Lan Jian , Liao Yingjie 
Published: March 2021

Abstract
Cruising phase is the important stage for aircraft performance optimization. This paper introduces a method of simultaneous optimization of multi-objective such as flight fuel cost, time cost, and shortest re-planning path under the constraints of hazardous environment, into trajectory planning for cruising phase. A dynamic optimization model of the route under hazardous weather and a performance optimization model for cruising phase of the vertical profile are established, and intelligent algorithms are used to solve them. Taking a certain route as an example, a dynamic real-time optimization route is generated by using the dynamic route optimization model. Combining with the performance data of a certain type of aircraft, the performance optimization model of the cruising phase is used to optimize its performance of cruising phase. In the end, this paper verifies the optimization results of the multi-objective optimization algorithm for route and performance.
Research and Application of temperature indicating controller temperature probe replacement tool and test tool frame
Authors: Yang Hongliu , Wang Shaoran , Dong Gang , Ni Hongwei , Man Xiaoping , Du Guoguang , Yang Liu 
Published: March 2021

Abstract
In view of the aging and corrosion of temperature probe caused by environmental problems, the traditional replacement method has problems such as long time consumption and difficulty in replacement. It is proposed to make a temperature indicator controller temperature probe replacement tool, which can further improve work efficiency and reduce power failure overhaul time. And in view of the human error in the temperature test of the temperature indicating controller and the technical error caused by the collision of the thermal resistance, combined with the relevant conditions of the electrical laboratory, a multi-functional temperature test tool rack is designed to realize the auxiliary temperature indication controller test and reasonable storage of thermal resistance. Finally, a practical experiment is carried out on the tools and instruments developed, and the results show that the tools and instruments designed and developed in this paper are feasible and practical.