bluuebunny/crossref_metadata_2025 huggingface dataset:
Effects of different amendments on Lead and Cadmium in contaminated farmland soils around lead-zinc mines
Authors: Liu Ying , Yang Xiaomao , Zeng Hui , Zhao Zhenye , Xu Tingting , Zheng Ruibin
Published: March 2021

In order to provided a theoretical reference for the passive remediation of the farmland contaminated by cadmium and lead, eighteen different materials include lime kind agent, phosphate, iron oxide and clay minerals were used as the soil heavy metal passivators. Results showed that adding the passivators Ca(OH)2, sodium pyrophosphate, CaHPO4 could significantly decrease the available cadmium in soils, and the optimal concentrations were 2%, 1% and 2%, respectively. The passivators FeCl3, NaH2PO4 and CaHPO4 could significantly decrease the available lead in soils, and the optimal concentrations were 3%, 2% and 2%, respectively.
The Potentiality of Crassocephalum crepidioides for Phytoremediation of Cd Contaminated Soil under the Application of EDTA
Authors: Cheng Dandan , Liu Xixi , Zhang Hui , Zou Ziwei , Zhu Guangxu
Published: March 2021

Aiming to identify measures to improve the cadmium (Cd) extraction efficiency of Crassocephalum crepidioides on Cd contaminated soil, a pot experiment was conducted to investigate plant growth and Cd accumulation in Crassocephalum crepidioides enhanced by ethylenediaminetetraacetic acid (EDTA) application. The results revealed that plant growth was inhibited and biomass decreased while treated with EDTA. The application of EDTA activated Cd in soil, thus increasing the Cd concentration of leaf, stem and root of Crassocephalum crepidioides by 10%∼91%, 13%∼98%, 20∼93%, respectively. According to the Cd extraction amount by the plant, potential phytoremediation capability of Crassocephalum crepidioides in Cd contaminated soils would be enhanced effectively with application of 4 mmol⋅kg−1 EDTA, however, the environmental risks should be considered synthetically when using. This study can provide a basis for the remediation of Cd contaminated soil.
Effects of Biochar and AM Fungi on Growth, Mineral Elements and Cadmium Uptake of Mulberry under Cadmium Stress
Authors: Guo Xiongfei , Li Yunxiang
Published: March 2021

In order to explore the synergistic effect of biochar and arbuscular mycorrhizal (AM) fungi on plant growth under cadmium (Cd) stress, a pot experiment was conducted to investigate the effects of biochar application and AM fungal inoculation on mulberry (Morus alba) seedling growth, mineral element absorption, Cd uptake, soil pH and Cd availability under Cd contamination at 2 levels (0 and 4 mg⋅kg−1). The results showed that biochar application could increase the mycorrhizal infection rate of AM fungi. Biochar application and AM fungal inoculation alone or their combination could all increase plant height, biomass, mineral element content and soil pH, while reduce Cd bioavailability in soil and Cd uptake by mulberry seedlings. The effects of biochar application in increasing soil pH and N and K uptake were better compared with AM fungal inoculation. However, AM fungal inoculation presented better effects in promoting mulberry seedling growth, improving P, Ca and Mg absorption by mulberry seedlings, and reducing Cd availability in soil and Cd absorption by mulberry seedlings. The combination of biochar application and AM fungal inoculation obtained the best effect. Under Cd level of 4 mg⋅kg−1, the combination of biochar application and AM fungal inoculation increased plant height and N, P, K, Ca and Mg contents in mulberry leaves by 43.28%, 125.56%, 178.48%, 3.63%, 181.04% and 128.04%, respectively. While, Cd concentration in the roots, stems and leaves of mulberry seedlings decreased by 46.48%, 67.86% and 58.97%, respectively. Moreover, pH increased by 5.33%, while Cd availability in soil decreased by 69.53%. In conclusion, biochar and AM fungi alone or their combination can all reduce Cd stress, and promote plant growth and mineral element absorption. The combination of biochar and AM fungi presents the best effect. Biochar combined with AM fungi can be used as an effective measure for ecological restoration of degraded soil and agricultural production safety.
Research on Pollution Prevention and Control of Construction in Henan Province Based on the GSE System
Authors: Han Xue
Published: March 2021

A research framework supported by the GSE system is formulated. The research is focus on the implementation of construction pollution prevention and control of Henan Province. Three levels, government, society and enterprise, are touched, from macro to micro, from the whole to the part.
Comparative Analysis of Six Geologic Sequestration Methods
Authors: Zhao Hongmeng
Published: March 2021

With the extensive use of fossil fuels[1] since the advent of the industrial age, the amount of carbon dioxide emitted is also increasing dramatically, which has also led to a severe greenhouse effect[2]. The method of carbon capture and carbon sequestration[3] proposed in recent years is a good way to deal with too much carbon dioxide. However, Carbon Sequestration is a new idea without enough practice and verification, and its development is not perfect yet. This paper reviews six commonly used geological Carbon dioxide storage methods and compares the advantages and disadvantages of them. It can be concluded that hydrodynamic force sequestration is the most suitable, effective and promising method of Carbon sequestration[4]. This study aims to provide scientific suggestions and theoretical basis for the future development of carbon sequestration, and it also provides effective help and support for environmental protection.
Research on Emission Standards and Control Technology of Heavy Commercial Diesel Vehicles
Authors: Xiaomin Liu , Zhaoming Wang , Yezhen Li , Qifeng Liu
Published: March 2021

More than 70% of the pollutants produced by heavy commercial diesel vehicles are from exhaust, which contains a large number of harmful substances. These substances are discharged into the air with vehicle exhaust, polluting the environment. In addition, the emission height of automobile exhaust is mainly between 0.3 meters and 2 meters, which is exactly the breathing range of human body, thus posing a threat to human health. At present, China has improved the management of exhaust emission testing of heavy commercial diesel engines, and the emission standard has been gradually raised from the national V standard to the national VI standard. This paper mainly expounds the hazards of different pollutants, studies on the national emission standards and control technologies, and provides references for the related industry research.
Study and analysis of arsenic adsorption during sludge incineration
Authors: Liu Dengdeng , Ren Xiaohan
Published: March 2021

This paper studies the mechanism of arsenic adsorption by different adsorbents during sludge incineration. The mechanism of arsenic adsorption in the sludge incineration process was studied in a vertical furnace. The arsenic adsorption performance of CaCO3and Fe2O3at different temperatures was studied. When the temperature is 900°C, the overall adsorption performance is the best. Therefore, the arsenic adsorption performance of Al2O3, molecular sieve and its metal load at 900°C is further studied for comparison. The research results show that: the optimal adsorption temperature of CaCO3is 900°C, the optimal adsorption temperature of Fe2O3is 800°C, and the adsorption performance of CaCO3is better than Fe2O3. Ca2+: Al3+=0.5 and Fe3+: Al3+=0.4 are close to the adsorption saturation state when Al2O3adsorbs arsenic at 900°C. When the molecular sieve adsorbs arsenic at 900°C, the adsorption effect is best when the molecular sieve is 10X, Ca2+: Al3+=0.8 and Fe3+: Al3+=0.6 are close to the adsorption saturation state.
Simulation of the shear effect in the ultrasonic descaling of the heat exchanger which produces viscoelastic soft scale
Authors: Ma Tao , Wang Hehui
Published: March 2021

The research object of this paper is a heat exchanger that produces viscoelastic soft scale in a chemical company. The finite element software ANSYS is used to simulate and analyse the shear effect in the ultrasonic descaling process. In the research, the parameters of the Prony series model of viscoelastic materials were obtained by fitting the relaxation modulus data, then the shear stress on the interface between the scale and shell of the heat exchanger was calculated by transient dynamic method, and finally the influence of ultrasonic parameters on the shear effect strength was explored by setting multiple working conditions. The results show that the strength of shear effect increases with the increase of ultrasonic amplitude or the decrease of ultrasonic frequency, so it is advisable to use the high-amplitude and long-pulse ultrasonic wave for scale removal. The simulation method and conclusion in this paper can provide reference for ultrasonic parameter selection in descaling of heat exchange equipment.
Fenton-like reaction-induced degradation of Methylene Blue by using supermacroporous ferrimagnetic nanorings
Authors: Jiao Xibin , Li Jinghua , Wang Chaojie , Shi Jiahua , Jiao Junbo , Zhang Jianbo , Lei Qiuwei , Xiao Zhenqun , Ye Jiangxue , Guo Shouwei
Published: March 2021

The removal and/or degradation of methylene blue (MB) from dyestuff wastewater has attracted widespread attention. Utilization of environmental purification nanomaterials is an effective means in the field of environmental remediation, and degradation efficiency under different circumstances is always a high priority for the nanoagents. In this study, uniform supermacroporous ferrimagnetic Fe3O4 nanorings (sFe3O4-NRs) were fabricated for high-efficiency MB degradation. Typically, the sFe3O4-NRs were prepared by a convenient hydrothermal method. Subsequently, the morphology structure of the sFe3O4-NRs was characterized by scanning electron microscope (SEM), transmission electron microscope (TEM) and highresolution transmission electron microscopy (HRTEM), respectively. Next, a Fenton-like reaction-induced MB degradation was performed in the present of sFe3O4-NR nanocatalysator and hydrogen peroxide (H2O2). Meanwhile, the sFe3O4-NRs showed excellent Fenton-catalytic activity for degradation of MB in a wide range of pH (3-11). Moreover, because of the magnetic property of the sFe3O4-NRs (saturation magnetization of 34.26 emu/g), the used sFe3O4-NR could be rapidly separated from the reaction medium by using a magnet, the sFe3O4-NR resented relative high catalytic activity even after 10 times reuse. The main conclusion from this work was that the as-synthesized sFe3O4-NRs nanoagent was a type of desirable Fenton catalyst to degenerate MB from wastewater.
Study on microbial remediation of heavy metal contaminated soil
Authors: Jiaming Qin , Biguang Jiang , Xiaolong Nan , Rui Xu , Youyu He , Guoqing Jiang , Jinning Qin , Yongbin Yang , Qian Li
Published: March 2021

This paper studied the leaching effect of various strains on the heavy metal contaminated soil around the mining area of Dong’an County, Hunan Province. By measuring the form of heavy metals of antimony and arsenic in the soil and the concentration of heavy metals in the solution, the remediation effect of microorganisms in different pH conditions and different soil environments on the heavy metal contaminated soil was explored. The results showed that Acidithiobacillus thiooxidans(A.c) and Acidithiobacillus thiooxidans(A.t) had better leaching effect. Under the initial conditions of pH equal to 1, 10% bacteria content and 10 g/L S, the active metal components in the soil could be dissolved. The results showed that microorganism could remediate the soil contaminated with heavy metals and make the available metal components in the soil reach the safety standard.
Experimental study on deflection of recycled concrete twoway slab under concentrated load
Authors: Hu Pengjie , Fang Guangxiu , Li Zhongwei
Published: March 2021

In order to study the deflection calculation method of recycled concrete two-way slab under concentrated load, a full-scale model of recycled concrete two-way slab was designed, and the replacement rate of recycled coarse aggregate was 30%. Through the loading test, the failure mode of the two-way slab was observed, and the test data of the whole process curve of the deflection changing with the load value and the development of the mid-span deflection were obtained. Based on the current theoretical formula, this paper uses Origin software to simulate the deflection of recycled concrete two-way slabs under concentrated load on the basis of comparing the deflection test value and the theoretical calculation value, and proposes a correction coefficient for the two-way slab deflection calculation. For the proposed two-way plate deflection calculation correction factor, the existing test data is used to verify it. The results show that the deflection value calculated according to the method in this paper is relatively close to the test value. The research results can provide reference for follow-up experiments.
Study on formation mechanism of ground fissures induced by underground engineering construction in Chongqing area
Authors: Hu Ting , Zhang Jinhao , Li Qingshan , Wang Wei , Liu Jia
Published: March 2021

The geological structure of Chongqing area is complex, many small and mediumsized faults are developed in the axis of anticline fold, and there are many structural fissures in rock strata, and karst landform is developed in some areas. With the development of economy, the construction of underground engineering is increasing, which leads to the rapid decline of groundwater and construction vibration, resulting in a large number of uneven ground settlement, and the formation of ground fissures. This paper introduces the various forms of ground fissures, analyzes the formation process of uneven ground settlement area in the process of underground engineering construction, establishes the stress model of soil surface cracks based on the fracture mechanics theory of cohesive soil cracks, uses the fracture judgment of I-II composite cracks to determine whether the cracks expand or not, and uses the formula of soil cracking angle to calculate its propagation direction, and preliminarily explains the fracture mechanism of soil in the ground fissure area. It provides reference for the further study of corresponding disaster mechanism.
Study on the Migration of Manganese in the Hyporheic Zone of a Reservoir
Authors: Yingming Feng
Published: March 2021

In order to study the laws of the spatial change of manganese in hyporheic zone, this paper takes Reservoir A as the actual research object, and analyzes the migration and change mechanism of manganese in the hyporheic zone by means of field sampling and data collection. The results show that the manganese content in the hyporheic zone of Reservoir A is changed rapidly after impoundment, and a new hyporheic zone is formed. When the hyporheic zone is closer to the surface water of the reservoir, the manganese content will stabilize faster. In the vertical direction, the hyporheic zone has a de-oxidation effect on manganese. The de-oxidation effects on manganese during wet period and dry period are 19.2% and 13.7% respectively. Within the hyporheic zone, the change of manganese content decreases gradually; while outside the hyporheic zone, the change of manganese contents increases gradually from the top to the bottom.
Calculation Method of Deflection Recycled Concrete Two-way Composite Under Concentrated Load
Authors: Li Zhongwei , Fang Guangxiu , Hu Pengjie
Published: March 2021

In this experiment, a full-scale model of recycled concrete two-way laminated slab with a 30% replacement rate of recycled coarse aggregate was used. Through concentrated load loading tests, the mechanical properties of recycled concrete two-way laminated slabs were studied, it includes bearing capacity, crack distribution, stiffness and deflection. According to its stress characteristics and on the basis of the current specifications, the stiffness formula is adjusted, and the deflection value is calculated theoretically. By comparing the measured value with the theoretical calculation value, the modified formula of the deflection of recycled concrete two-way composite slab is put forward.
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

Shale 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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.
Design and Implementation of Memory Assistant Based on Ebbinghaus Forgetting Curve
Authors: Huang Yanbiao , Fu Bo , Lai Yujing , Yao Yujie
Published: March 2021

In view of the single stereotype of memorizing knowledge points with the help of traditional books and easy to distract attention in the process of memorizing with the help of mobile phones and computers, a mobile handheld device, memory assistant, is designed and developed based on Ebbinghaus forgetting law curve, embedded software and hardware development technology, and memory list cycle pushing intelligent algorithm designed by forgetting curve law as the core. The experiment shows that the device is convenient and flexible like electronic devices such as mobile phones and computers, and also has the characteristics of high efficiency and concentration of book memorizing, at the same time, scientific and reasonable learning plan can effectively improve the efficiency of users’ Recitation and memory.
The Impact of Environmental Regulation on the Innovation and Diffusion of Low-Carbon Technology in Energy Sector
Authors: Wang Dong , Huang Lei , Sun Zijun , Zhou Wenyu , Wang Weidong
Published: March 2021

The issue of climate change caused by GHG is increasingly serious. As the main emission source, the energy sector has promising potential for emission reduction. In the context of low-carbon technology transition in China’s energy sector, this paper uses panel data of 30 provinces from 2000 to 2017, totally 297,721 patent data, and empirically examines how environmental regulation affects regional energy low-carbon technology innovation and diffusion under the framework of the "Porter Hypothesis". In addition, regional heterogeneity is also considered and the sub-samples of eastern, central and western regions were studied separately. The conclusions show significant heterogeneity in regions. The eastern region, which is less dependent on industries with high emissions and energy consumption, environmental regulation does not affect the innovation and diffusion of low-carbon technology in the energy sector. With the increasing intensity of environmental regulation, only the diffusion of low-carbon technology in the central region has been significantly improved, indicating that this region mainly adopts the introduction and learning of existing low-carbon technologies to meet the demand of emission reduction. Under the circumstances of high risk, uncertainty, sunk cost and opportunity cost brought by low-carbon energy technology, covered companies in western region are more inclined to relocate limited resources to schemes rather than low-carbon innovation.
Research on the Ecological Performance Index System of Automobile Products Based on End-of-Life Vehicle
Authors: Hou Meng
Published: March 2021

Automotive hazardous substances and recyclables (ELV) are important indicators of the ecological design of automotive products. With the acceleration of the green transformation and upgrading of the automotive industry, the ELV performance of automotive products has gradually attracted the attention of enterprises. How to evaluate the pros and cons of ELV performance of automotive products has become a common problem facing the industry. This article is mainly for passenger car products, focusing on the ELV performance evaluation method of the whole vehicle, aiming to build a more systematic ELV evaluation index system to measure the pros and cons of the automotive eco-design level, and guide the automotive companies to achieve ELV performance and product front-end design Fusion. Some exploratory researches in this article hope to provide useful reference for the evaluation of the ecological design level of automotive products.
The Architecture and Development of Intelligent Traffic Signal Control Platform
Authors: Wang Zhao , Pan Yawen , Wang Mengjie
Published: March 2021

The project used intelligent video analysis, traffic big data information processing and analysis technology to accurately grasp the traffic demand of urban traffic. The platform developed by this project could be combined with the vehicle level to adjust and optimize the traffic signal timing scheme in real time, which could improve road utilization of cities. This platform could use the big data analysis technology to predict future traffic situation based on historical traffic conditions and develop a best timing plan in advance. Under the existing road network conditions, the basis of this project was to rationally organize and plan traffic flow, improve road traffic management facilities, and strengthen and enhance the modern traffic awareness of traffic participants. The goal of the platform was to provide order, smooth, safe and traffic management services, it also aims at rapid response, and decision-making in the field of intelligent transportation.
Study on the relationship between water resources utilization and economic development based on decoupling theory in Beijing
Authors: Tao Aixiang
Published: March 2021

Since the Chinese government put forward the strategy of ecological civilization, China’s ecological environment has been significantly improved. At present, in some places, there is a phenomenon that the ecological environment and economic development are not coordinated. Taking Beijing as an example, this paper uses decoupling theory to study the relationship between water resources use level and economic development in Beijing. The results show that the relationship between water resources use and economic development has been obviously decoupled in Beijing. Beijing government can make further efforts in increasing investment in education, improving the level of investment in science and technology, so as to promote the coordination of water resources utilization and economic development.
Is acupuncture effective in the treatment of COVID-19 related symptoms? Based on bioinformatics/network topology strategy
Authors: Han Zhenzhen , Zhang Yang , Wang Pengqian , Tang Qilin , Zhang Kai
Published: March 2021

Acupuncture is an important part of Chinese medicine that has been widely used in the treatment of inflammatory diseases. During the coronavirus disease 2019 (COVID-19) epidemic, acupuncture has been used as a complementary treatment for COVID-19 in China. However, the underlying mechanism of acupuncture treatment of COVID-19 remains unclear. Based on bioinformatics/topology, this paper systematically revealed the multi-target mechanisms of acupuncture therapy for COVID-19 through text mining, bioinformatics, network topology, etc. Two active compounds produced after acupuncture and 180 protein targets were identified. A total of 522 Gene Ontology terms related to acupuncture for COVID-19 were identified, and 61 pathways were screened based on the Kyoto Encyclopedia of Genes and Genomes. Our findings suggested that acupuncture treatment of COVID-19 was associated with suppression of inflammatory stress, improving immunity and regulating nervous system function, including activation of neuroactive ligand–receptor interaction, calcium signaling pathway, cancer pathway, viral carcinogenesis, Staphylococcus aureus infection, etc. The study also found that acupuncture may have additional benefits for COVID-19 patients with cancer, cardiovascular disease and obesity. Our study revealed for the first time the multiple synergistic mechanisms of acupuncture on COVID-19. Acupuncture may play an active role in the treatment of COVID-19 and deserves further promotion and application. These results may help to solve this pressing problem currently facing the world.