bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on the Measurement of Muzzle Shock Wave Pressure Field for a Naval Gun
Authors: Qiankun Chen , Panfei Li , Qi Zhou , Xuefeng Wang , Meng Li
Published: June 2021

The shock wave test of naval gun is of great significance to the safety of the appraisers and the impact on other equipment and parts around the muzzle. In order to test the size and distribution of the muzzle shock wave of a naval gun, a set of shock wave testing system is built, and the test of ammunition under high or low temperature is carried out. On this basis, three interpolation methods of equal pressure surface are analyzed. Finally, we adopt the B-spline method to draw the isobaric field surface and isobaric curve of muzzle shock wave. The results show that the maximum pressure appears at 1 m behind the muzzle, and then the shock wave pressure decreases rapidly, and the attenuation velocity of the shock wave behind the muzzle is significantly greater than that in front of the muzzle; The isobaric line density near the muzzle is higher than that in other areas, conforming to the distribution characteristics of shock wave, and verifying the correctness of the test method; When launching ammunition with high temperature, the density of isobars near the muzzle is much higher than that of low temperature ammunition. The distribution of isobars can provide reference for evaluating the impact of shock wave on other equipment and parts around the muzzle.
Harmonic Analysis of Magnetic Field Measurement of Maglev Plane Motor
Authors: Wenru Xu , Shengguo Zhang , Weiwen Hu , Jiawei Yang , Hao Hou
Published: June 2021

With the rapid development of production scale and technology level in the field of precision engineering technology, plane motor is a new type of motor which can directly output plane motion and has the characteristics of simple structure, high precision and fast response speed. In this paper, the magnetic levitation plane motor (MLPM) as the research object, it is a hot research and development in recent years, MLPM has a good application prospect in driving advanced manufacturing equipment used under high vacuum conditions. In this paper, the harmonic characteristics of magnetic levitation plane motor are analyzed by establishing the analytical model of each odd harmonic. The actual magnetic field of the permanent magnet array is measured on the measuring platform of Tesla meter, and the measurement results are analyzed. And then the analytical data are compared with the actual field data. Further calculation shows that the maximum relative error between the simulated and measured results decreases gradually with the increase of the odd harmonic order of the magnetic field.
Research on the Business Model of Hazardous Waste Disposal of Power Grid Enterprises Based on the Commercial Canvas Model
Authors: Xinli Xiao , Zhuonan Li , Yanming Jin , Min Liu , Lingyu Chen
Published: June 2021

The issue of hazardous waste disposal has become a key difficulty and obstacle for power grid companies to achieve green development. This article systematically analyses the business model of hazardous waste disposal of power grid companies based on the business model canvas model, which consists of value proposition, core resources, key business, important partners, customer segmentation, channel access, customer relationship, cost structure and revenue sources, and then lays a theoretical foundation for hazardous waste disposal of grid companies.
Research on Influence of Temperature on Capacity Fade of Lithium Ion Battery
Authors: Bai Dingsong , An Ziliang , Wang Ning , Liu Shaofeng , Yu Xintong
Published: June 2021

In this paper, the research object is the ternary lithium battery with the NCA as positive material and graphite as negative material. The model of one-dimensional capacity fade is established by COMSOL. At different simulated temperatures, the changes of the SOC and the voltage drop of the SEI film on the positive surface were analyzed. The results show that the SOC of average on the positive surface of the battery decreases with the increase of temperature and increase of the battery impedance.
Research on energy densities of secondary batteries
Authors: Zi-qiang Mei , Xiao-chen Liu , Wan-long You , Xiao-bin Yu
Published: June 2021

Improving the energy densities of secondary batteries has always been the core goal of scientific research and engineering development. In this paper, by testing the energy densities of the test samples, the gravimetric energy density (GED) and volumetric energy density (VED) of Li-ion and Li-metal batteries are analyzed. By comparing with the development trend of batteries at home and abroad, we can see that Li-metal batteries are the development direction of high-energy-density batteries in the future. By comparing the test results of this paper with the energy densities data published at home and abroad, we can see that the GED and VED of Li-ion and Li-metal batteries in China have reached the international advanced level. The research results of this paper can basically reflect the development status and provide guidance for the development of high-energy-density batteries in China.
Research on Live Detection Technology of Contact Ablation Degree of Power High Voltage Reactive Power Switching Switch
Authors: Wang Shao Ran , Zhang Yi Zhu , Zhao Xiao Bing , Jia Shou Hui , Yu Bo , Hou Xin Ming , Liu Yi Ning
Published: June 2021

In power system, high voltage reactive power switching switch is an important control unit, which is an important tool to start the connection of power equipment. In order to ensure the safe operation of high-voltage reactive power switching switch, this paper proposes a new method for live detection of contact ablation degree of high-voltage reactive power switching switch to solve the lack of effective detection and evaluation means of contact ablation degree of high-voltage reactive power switching switch in power system. During the opening and closing process of high voltage reactive power switching switch, RF electromagnetic wave signal will be radiated, which contains information reflecting the ablation degree of contact. In this paper, through the detection and analysis of electromagnetic wave signal, the detection of contact ablation degree of high voltage reactive power switching switch is realized. This paper analyzes the influencing factors of radiated electromagnetic wave in the process of circuit breaker opening and closing. The anti-interference method of electromagnetic wave field detection is used to realize the live detection of contact ablation degree of high voltage reactive power switching switch. It effectively solves the problem of mutation detection of contact ablation degree of high voltage reactive power switching switch, and greatly improves the detection rate of contact ablation degree defects.
Research on Fault Diagnosis of Smart Meters Based on Machine Learning
Authors: Huang Changbao , Wang Youxiang , Liu Ying , Wang Chao , Wang Guanhe
Published: June 2021

To strengthen the real-time monitoring and management of on-site meters and to detect hidden problems of meters for timely correction, this paper proposed a fault diagnosis method of smart meters based on the decision trees of machine learning. By establishing a fault analysis model for smart meters, this method analyzed the laws of smart meter failures. It extracted typical characteristics from the massive data produced by the operating smart meters and studied the correlation among these characteristics as well as weight coefficients to obtain the probability of smart meter failures. Furthermore, the model was constantly optimized according to the feedback of on-site meter troubleshooting from operation and maintenance personnel, which effectively enhanced the timeliness and accuracy of fault detection and correction and reduced the difficulty of operation and maintenance.
P-delta effect analysis of continuous distribution system based on generalized differential quadrature method
Authors: Wang Haifeng
Published: June 2021

Based on the generalized differential quadrature method, an analysis method of p-delta effect for continuous distribution system is proposed. Firstly, the structural system with continuous distribution of mass and stiffness is taken as the research object. Based on the principle of virtual work, the axial and transverse vibration equations considering the effect are given. Secondly, the partial differential equations are discretized by using the generalized differential quadrature method, and the dynamic ordinary differential equations are obtained to analyze the p-delta effect of the continuous distribution system. Finally, an example based on 5MW wind turbine parameters is analyzed, and the results show that the GDQM has high calculation accuracy, which can be obtained by dividing only a few nodes; This method can not only consider the second-order effect of gravity, but also consider the time-varying p-delta effect caused by vertical earthquake, and can reveal the influence of vertical earthquake on the lateral dynamic characteristics of structures in real time; No matter the gravity second-order effect or the time-varying p-delta effect, this method does not need iteration and has high computational efficiency.
Research on the Whole Process Control of Cold Chain Transportation under the Background of Resource Saving
Authors: Jing Ye , Si-Cong Li
Published: June 2021

With the continuous improvement of people’s requirements for food safety and quality, cold chain logistics has become the focus of much attention in the logistics industry. my country’s Cold chain logistics is developing rapidly in China, but the overall level is low, and the cold chain loss rate of fresh agricultural products is high, causing huge waste. Road transportation is an important part of cold chain logistics. 90% of the freight volume in the cold chain logistics is completed by road transportation, but the proportion of broken links in the transportation process reaches 60%, which seriously affects service quality of cold chain logistics. Cold chain logistics is directly related to people’s life safety and physical health, and it is also an important way for my country to build a resource-saving society. However, one of the problems with the inadequacy of the cold chain is the incomplete management system, extensive management methods, and imperfect management systems and standards of the cold chain transportation enterprises, refrigerated and heat-preserving vehicles and other basic elements by the industry management department. Therefore, it is necessary to establish a closed-loop management and control system for the entire process of “market access-process monitoring-service evaluation-joint rewards and punishments” centering on road cold chain transportation. The high-quality development of logistics creates a good market environment, improves the service quality and management level of cold chain transportation, and reduces the loss of agricultural products in the cold chain logistics process.
Research and Application of Electromagnetic Wave Signal Acquisition Device for Power System Circuit Breaker
Authors: Wang Shao Ran , Zhang Yi Zhu , Wang Chao , Jia Shou Hui , Hou Xin Ming , Lv Yue , Chen Chen
Published: June 2021

Power circuit breaker is an important tool to satisfy the controllability and safety of power system. Therefore, to ensure the stable operation of the circuit breaker is to ensure the normal supply of electric energy. In order to better capture the electromagnetic wave signal radiated by the circuit breaker and better judge the state of the electromagnetic wave radiated by the arc of the circuit breaker, a new type of vibration trigger device specially used for collecting the electromagnetic wave signal radiated by the circuit breaker and its use method are proposed in this paper. This method can collect the electromagnetic wave signal of circuit breaker through the optimized design of vibration trigger device. The device uses all metal integrated cast aluminum shell and independent power supply. This device can effectively resist electromagnetic interference, and is convenient for the acquisition of electromagnetic wave signal. The device developed in this paper and its application method belong to the field of off-line detection of electrical equipment, and are especially suitable for vibration triggering of the device when collecting the radiated electromagnetic wave signal during the action of circuit breaker.
Electrochemical evaluation myclobutanil as inhibitor for copper in nitric acid medium
Authors: Tao Xuefei. , Tengxu Lingjie , Liu Guanting , Tao Zhihua
Published: June 2021

Myclobutanil is a triazole fungicide with low toxicity and easily biodegradable so that it can be used as an alternative corrosion inhibitor in metal pickling. Myclobutanil was studied as a corrosion inhibitor of Cu in 0.5M HNO3 solutions by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). Electrochemical test show that myclobutanil is an effective inhibitor and the inhibition efficiency equal approximately to 93.7% when the inhibitor concentrations were fixed in 1mM.
Experimental study on the effect of heat transfer temperature difference on frosting characteristics of air-cooled heat exchanger
Authors: Jia Lu , Shen Jiang , Hu Kaiyong , Zhu Tingting
Published: June 2021

In this paper, the frosting experiment was carried out by the wind tunnel experimental device in the single experimental section of the closed-mouth return flow. Through the experimental study on the influence of heat exchange temperature difference on the growth characteristics of the frosting layer in the finned evaporator under the experimental conditions of different initial head wind speeds, the following conclusions were drawn: At 2m/s, the frost thickness of finned tube evaporator increases gradually with the frosting time at different heat exchange temperature differences. At 3, 4, 5m/s initial face wind speed, the frost thickness of finned tube evaporator grows in a three-stage pattern at different heat exchange temperature differences. The cooling capacity of the evaporator at different face wind speeds and different heat transfer temperature differences increases first and then decreases with the frosting time.
Research on Electric Control Device of Hybrid Energy in Household Air Conditioning
Authors: Zhang Yanyan
Published: June 2021

Hvac energy consumption is the construction of large energy consumption, in order to realize building energy conservation to reduce the energy consumption of hvac operation, through the research by a thin film solar battery, connecting wires, charge and discharge controller, the electric control board outdoor, indoor machine electric control box, electronic circuit control board, switch and battery of household air conditioning hybrid energy electrical control devices, When it is sunny, the direct current generated by the solar cell group is directly supplied to the indoor unit. When it is cloudy, it is switched to the power supply to the indoor unit, forming a hybrid power supply mode for complementary use, which can effectively reduce the electric energy consumed by the operation of HVAC and realize energy saving in the operation of HVAC.
Research and Application of a Technology Eliminating Restriction of Electrical Equipment Capacity as Clean Electricity Heating Develops Rapidly
Authors: Limin Deng , Lingwen Sun , Di Zhao , Jia Song , Lingzhi Pan , Yizhu Zhang
Published: June 2021

Replacing coal by electricity projects is one of the national public welfare projects. In the field of energy conversion, the larger the number of electric heating users is, the more favorable it is to control air pollution, and the more significant benefits of the society, ecological system and environment are. This paper put forward a technology for solving restriction on rapid development of clean electricity heating due to electrical equipment capacity. It is able to enable a large number of users to access the power distribution network without capacity increase or with little capacity increase, which is beneficial to promoting electric heating extensively and accelerating the process of “replacing bulk coal by clean electric energy” project in China.
Research on Application of Network Slicing Technology Based on 5G in Smart Grid
Authors: Wei Hongliang , Chen Guohui , Zhang Yizhu , Guo Chao , Shi Shuo , Liu Yong , Wang Chuntao , Suo Dongdong
Published: June 2021

5G technology has been continuously promoted and has become a key driving force to promote the development of all walks of life and assist the national strategic decision-making. In the era of Internet of Everything, 5G network slicing technology, with its advantages of low latency, high security and scheduling, can better realize the rational and efficient scheduling and allocation of network resources, and fully improve the effective utilization rate of resources. This paper systematically summarizes the network slicing technology, analyzes the application of 5G network slicing technology in different power Internet of Things business scenarios and communication requirements, and puts forward the challenges that 5G network slicing technology in smart grid may face in the future, aiming at providing theoretical basis for the further development of 5G technology and promoting the continuous development of 5G smart grid application.
Analysis of Serious Deformation of Cavitation Tubing in Salt Cavern Gas Storage in Jianghan Oilfield
Authors: Wei Hu , Shigang Fan , Chenglin Wang , Guohai Yuan
Published: June 2021

Jianghan Oilfield salt cavern gas storage is characterized by depth, high temperature and high pressure. At present, the main problem of Jianghan Oilfield salt cavern gas storage is that in the process of cavitation, the frequent bending deformation at the end of the cavitation tubing string leads to the difficulty of operating the tubing string, which extends the cavitation period and affects the production of the gas storage. The problem of tubing string in the cavitation of salt cavern gas storage in Jianghan Oilfield was counted, and the causes of tubing string bending were analyzed from the aspects of salt layer geological characteristics, tubing string mechanics, fluid mechanics, etc. It was concluded that the injection rate was higher than the critical liquid carrying flow rate, leading to tubing string instability and deformation, which provided theoretical reference for the construction of salt cavern gas storage.
Refined Calculation and Demonstration for Sunshine Temperature Difference Effect of Long Span Continuous Beam
Authors: Peiliang Jia
Published: June 2021

The continuous rigid frame bridge of Jiagai River Bridge is (100 + 192 + 100) m, with a main span of 192m, which will break the historical record of 176m of Chaoyang Jialing River Bridge and become the largest continuous rigid frame bridge of single track railway in China. The single track railway continuous rigid frame bridge has the characteristics of large load, poor stability and high prestress requirements. The temperature difference in sunlight will produce temperature deformation and emperature stress in the concrete box girder bridge, which will affect the linear monitoring measurement results. In particular, the sunshine temperature difference will produce nonlinear temperature gradient in the vertical and transverse direction of the cross section of the statically indeterminate box girder bridge, resulting in the generation of temperature self stress and temperature secondary stress. This kind of temperature stress is often large, which leads to the cracking of concrete and even endangers the normal operation in the future. This paper studies the calculation of temperature field, temperature stress and temperature deformation of concrete box girder caused by solar radiation, and compiles a program to realize the visual calculation of sunshine temperature effect.
Research on all-optical redundancy networks underground coal mines
Authors: Zhang JinHao , Lin Yin , Chen Min
Published: June 2021

In view of the serious environmental interference of coal mine underground, the inconvenient power supply of underground equipment and the existence of passive serial series series number of existing F5G underground network network, explore a new coal mine underground all-optical network redundancy technology networking scheme, realize the multi-stage series of passive light branches of the mine, Solve the problem of low number of underground optical branches in series and anti-interference of communication. Based on the principle of all-optical network network, this paper expounds the redundancy protection mechanism of all-optical network group, and designs a wide-ranging coverage scheme of fiber optic whole mine through precision calculation and analysis. Through laboratory verification and coal mine roadway simulation experimental data show that the all-optical redundancy technology network scheme can realize the underground passive light multi-stage serialization, while ensuring the priority and reliability of underground gas system. At the same time, the priority and reliability of the underground gas system are guaranteed; the scheme parameter comparison table is suitable for various types of coal mines and can be used as a reference for coal mine users in the construction of underground all-optical networks.
Resistivity Measurements to Study the Early Chemical and Autogenous Shrinkage of a Binary Alkali-activated Slag-metakaolin System
Authors: Zhu Chunyan , Zhou Yu , Guo Yaoxiang , Wen Zhiwen , Zhang Liangwei , Wang Zhihan , Fang Yuan , Long Wujian
Published: June 2021

Alkali-activated slag-metakaolin (AASM) has a lower shrinkage than alkali-activated slag, but its complex shrinkage behaviour remains elusive. In this paper, resistivity measurements were used to monitor the early chemical shrinkage and autogenous shrinkage evolution of AASM (containing 10%, 30%, 50%, or 70% metakaolin). The MK content greatly affected the development of autogenous shrinkage of AASM, and the specimens with 50% MK showed the lowest autogenous shrinkage of 49%. The presence of MK delayed the formation of calcium aluminosilicate hydrate (C-A-S-H) gels (the activation products of slag), thus mitigating autogenous shrinkage. A functional relationship between early autogenous shrinkage and resistivity was established, which showed that resistivity can be used to evaluate and predict the early autogenous shrinkage of AASM.
A New Method of Determining the Lower Limit of Pore in Saturated Kerosene
Authors: Zhao Weijun , Yang Xinying , Huang Weidong , Wang Zongcheng , Li Ping , Nie Yanbo , Luo Yinghuan
Published: June 2021

To determine the lower limit of the pore size of saturated kerosene indirectly for testing porosity, the combined total porosity was first calculated using carbon dioxide adsorption, nitrogen adsorption, and mercury intrusion tests. Then the combined porosity is gradually accumulated from large pores to tiny pores. When the accumulation is equal to the total kerosene porosity, the corresponding pore diameter is a minor pore diameter measured by kerosene porosity. A total of 5 samples were collected this time. The lower limit of kerosene porosity was determined as 3.1nm, which shows that the kerosene saturation method can describe most of the shale’s mesopores and macropores. This method can also be extended to determine the lower limit of the pore size by the porosity method, such as helium.
The Ionothermal Synthesis of Dihydrophenazine-based Covalent Triazine Frameworks for Supercapacitors
Authors: Liu Caixia , Li Pengfei
Published: June 2021

The dihydrophenazine-based covalent triazine frameworks (CTFs) were prepared via a zinc chloride mediated ionothermal synthesis. The obtained dihydrophenazine-based CTFs exhibit high surface areas of up to 1213 m2/g with a high nitrogen content of 8.35 wt%. Electrochemcial test of dihydrophenazine-based CTFs shows a high specific capacity of 256 F/g in an aqueous electrolyte at a current density of 0.8 A/g with excellent rate capability and cycling stability.
Application of 5G Communication Technology in Power Communication and Research on Key Technologies
Authors: Chen Guohui , Wei Hongliang , Zhang Yizhu , Guo Chao , Shi Shuo , Wang Zhipeng , Yan Tianji , Ma Siqian
Published: June 2021

With the rapid development of power system and the deepening construction of smart grid, 5G communication technology is favored by all walks of life because of its ultra-low delay, ultra-high reliability, deep coverage, extreme capacity and ultra-low power consumption. It has become the key technology to lead scientific and technological innovation and promote the sustainable development of power system, providing a solid guarantee for the realization of human-computer interaction and Internet of Everything. This paper first introduces the network structure, basic principle and core features of 5G communication, and expounds the core slice of 5G communication and its three application scenarios; secondly, the potential demand scenarios of 5G communication in power system are analyzed in depth, that is, high capacity, high bandwidth and low delay business scenarios; finally, the key technologies of 5G communication, such as large-scale MIMO communication technology, ultra-dense heterogeneous network technology, green communication technology and millimeter wave communication technology, are discussed, and the linkage between current communication requirements and communication technologies is studied, which provides theoretical support for the application of 5G communication in power system.
Synthesis of polyethylene/bismuth molybdate and its photocatalytic properties
Authors: Hu Yu , Cao Mengmeng , Ding Peimei , Hu Wei , Lin Ruihua , Song Lianxiang
Published: June 2021

Bismuth molybdate (Bi2MoOe) was synthesised by utilizing Bi(NO3)3’5H2O and (NH4)eMo7O24’4H2O through hydrothermal method. Bi2MoOe was loaded on polyethylene (PE) to prepare the film with photocatalytic properties. The product was characterised by XRD and UV DRS spectra and investigated photocatalytic degradation of sulfanilamide under solar light. The results confirmed a photocatalytic efficiency of 66%.
Determination Method of Contact Ablation Degree of Circuit Breaker in Power System Based on Radiated Electromagnetic Wave Detection
Authors: Zhao Xiao Bing , Wang Chao , Man Xiao Ping , Yu Bo , Piao Yong Xin , Yang Jie , Ding Yu
Published: June 2021

Power is the most important energy in the current society, so it is very important to ensure the stable operation of the power system. In order to determine the state of the circuit breaker in the power system effectively, the power supply is stable. This paper presents a method to determine the ablation degree of the contact of the circuit breaker based on the radiation electromagnetic wave detection. The method adopts the means of electrical measurement and waveform observation to realize the rapid diagnosis of the contact ablation degree of the circuit breaker. The antenna is used to receive the radiated electromagnetic wave generated in the opening process of the circuit breaker, and the common oscilloscope is used to monitor the waveform. The number of electromagnetic wave pulses per unit time is analyzed to determine the ablation degree of the circuit breaker contact. If the number of pulses found by oscilloscope is large, it can be judged that the contact ablation is serious. The method mentioned in this paper belongs to the field of electrical engineering, which is mainly used to determine the ablation degree of the contact of the circuit breaker by means of electrical detection. This method has the advantages of simplicity, rapidity and efficiency.
Prediction of Comprehensive Water Cut in Periodic Waterflood Reservoir Based on Variable Weight Combination Model
Authors: LIU Quyang , LIU Xiaodong , Hao Dong , XUE Qiang
Published: June 2021

The comprehensive water cut of periodic waterflood reservoirs is random and volatile, and it is a non-stationary time series. In order to solve the problems of poor prediction results of conventional methods or heavy workload and long time-consuming in reservoir numerical simulation, an EMD-LSTM neural network model and a smoothing spline regression (Smoothing Spline) variable weight combined prediction model are proposed. This method introduces empirical mode decomposition (EMD) to process non-stationary and non-linear data, and combines the advantages of machine learning and curve regression to improve the prediction accuracy of the model. The variable weight combination model is used to predict the water content of the periodic water injection reservoir. The results show that the prediction accuracy of the variable weight combination model is significantly higher than that of the single model. The variable weight combination model can reduce the prediction error and can effectively and accurately predict the periodic water injection oil. The comprehensive water content of the reservoir can guide the adjustment of water injection parameters for periodic water injection reservoirs.
Foreign Object Detection of Electric Transmission Line with Dynamic Federated Learning
Authors: Haotian Sui , Tong Li , Pu Wang , Liang Xu , Hongwei Zhao
Published: June 2021

The bird’s nests and other foreign objects on the transmission lines bring about huge threats to the electric power security. The aggregation of foreign objects data of different regions can boost the generalization of foreign objects with deep learning. However, due to policy constraints and other data security reasons, it is impossible to collect the data of different power companies to train a joint foreign object detection model. Therefore a dynamic federated learning based foreign object detection method for transmission lines is proposed. For the clients distributed in power companies, each model is trained and uploaded to the central server in an asynchronous way for dynamic fusion. For the model trained with pre-trained model, the pre-trained part is frozen and will not be trained. Thus the feature extraction backbone is not uploaded to central sever, which contributes to the decrease of the communication consumption by reducing the amount of uploaded data. The experimental results demonstrate that the dynamic federated learning based foreign object detection algorithm can maintain the same accuracy level compared with centralized training. It can train the joint model without uploading the original data of the edge nodes, which guarantees the security and privacy of local data. Compared with training individually, it has great improvement in accuracy. And it is also applicable with different network sizes. Therefore the dynamic federated learning based foreign object detection has strong privacy, accuracy, efficiency, flexibility and scalability.
Energy consumption forecast of different industries under the social and economic transformation
Authors: Su Yun , Tian Yingjie
Published: June 2021

With the development of Shanghai’s social economy and the continuous transformation of the three major industries, Shanghai’s energy structure will also undergo corresponding changes. In order to study the proportion of electricity in energy consumption in the future, this paper predicts the consumption of electric energy and non-electric energy in Shanghai based on the Vector Error Correction Model (VECM), and analyses impulse response analysis and variance. The result of the experiment shows that development of Shanghai’s energy consumption structure will still keep in low carbon and electrification trend. From the perspective of the terminal energy consumption structure, the growth rate of power consumption will exceed the non-electric energy consumption one, and the proportion of electrification will be further increased.
Study on the characteristics of land use structure of key ecological public welfare forest areas in Fujian Province
Authors: Fan Xuncheng , Zhao Lili
Published: June 2021

Based on five-phase remote sensing image data, RS and GIS technologies were used to quantitatively analyze the quantity, rate and structure of land use changess in Shunchang county, Fujian Province, using the relevant calculation model of land use. The results showed that the land use types were frequently converted to each other between 1995 and 2015 in Shunchang county, among which forestland and cultivated land became the land with the most increase and decrease in area, respectively. In terms of the rate of change, the single dynamic degree of forestland, water area and unused land are all positive, among which, water area has the fastest rate of change with a dynamic degree of 9.57%. Grassland, cultivated land and construction land all have negative values, and cultivated land has the fastest rate of decrease. In terms of land use structure, both land development index and reclamation index show different degrees of decreasing trend. This study can provide scientific reference for the rational planning and utilization of land in Shunchang county and the surrounding counties.
Research on the integration of flue gas desulfurization and dust removal in oil shale refining
Authors: Xiaochuan Deng , Fengchang Sun , Dongyang Yu , Jiahua Wu , Zhichao Zhang , Zheng Wang
Published: June 2021

The flue gas of oil shale retort is characterized by high humidity, low sulfur content and tar content, which makes it impossible for traditional flue gas desulfurization facilities to deal with such flue gas normally. By collecting flue gas parameters at the inlet and outlet of the original desulfurization tower of oil shale dry distillation flue gas, and combining with computational fluid dynamics numerical simulation, this paper analyzes the fault reasons of each step in the process of desulfurization of oil shale dry distillation flue gas. Through experimental study, the flocculation characteristics of suspended solids and petroleum substances in desulfurization circulating liquid were analyzed. The results show that the low concentration of Na2CO3, Ca(HO)2, CaO desulfurizer can promote the flocculation, Ca(HO)2, CaO desulfurizer is beneficial to the removal of petroleum substances. The original wet limestone-gypsum desulfurization system was transformed into the wet sodium carbonate desulfurization and dust removal integrated system. The method of flocculation and sedimentation is used to remove sludge and petroleum substances, which can ensure the normal operation of the system and the emission of flue gas up to the standard.
A green synthesis method-nitrile hydration to synthesize amide
Authors: Guo Yue , Chi Yingnan
Published: June 2021

Amide compounds which are closely related to people’s clothing, food, shelter, and transportation play an important role in people’s daily production and life. Therefore, exploring and improving the synthesis of amide compounds is one of the topics that researchers have focused on in recent years. The hydration of nitriles to amides is an environmental-friendly and 100% atom economic method. Among the reported nitrile hydration catalytic systems, metal complexes have attracted considerable attention due to their high catalytic activity, excellent selectivity, mild reaction conditions, and tunability of catalytic performance at a molecular level. In this paper, we summarize the recent progress in the synthesis of metal complex catalysts and understanding of the catalytic mechanism, which provides a basis for the industrialization of metal complex catalysts.
Modelling tree height-diameter relationship of Quercus acutissima in a coniferous and broad-leaved mixed forest in Mount Tai, China
Authors: Hao Ming , Zhao Xiyue , Wang Qian , Wang Peng , Ni Ruiqiang , Lu Fadian
Published: June 2021

The aim of this study was to establish the relationships between height and diameter (DBH) of Quercus acutissima in a broadleaved-conifer mixed forests in Mountain Tai in China. Based on the data of Q. acutissima from a 0.6 hm2 permanent forest plot, the relationships between height and DBH were simulated with six empirical models, including Linear, Power, Chapman-Richards, Logistic, Korf and Weibull models, to select the optimization model. There is no significant difference in the predictive power of each growth model. The fitting and test results of each model in this study show that these six model forms have good prediction effects. The results showed that the logistic fitting effect is the best model for Q. acutissima. The Logistic model can be applied to the simulation of tree height and diameter of coniferous and broad-leaved mixed forests in this area.
Analysis and Research on the Pollution of Lakes in Beijing
Authors: pengfei Zhang , xiaoyu Cui , yunxia Gao , qingfei Cui
Published: June 2021

This article analyzes the pollution status of 22 key lakes in Beijing in the past 10 years. The results show that from 2010 to 2014, the proportion of lakes in Beijing’s Class II water bodies was 17.4%, and the average proportion of lakes in Class III water bodies from 2015 to 2020 was 29.2%; the decline in the proportion of Class V water bodies from 2016 to 2020 was more obvious. Water bodies inferior to Class V have been basically eliminated, but in 2019, many lakes have been in a state of moderate eutrophication. At the same time, the analysis during the year showed that the proportion of Type II water bodies was low from June to September, the lowest value was 11.7% in August, and the proportion was relatively high in February and March, and the highest value was 40.5% in March; In August, the proportions of Category IV and V water bodies reached the highest values of 33% and 24% respectively, which is related to the increase in summer water temperature and the shortage of water resources that can supply lakes. The research results are expected to provide support for the improvement of urban lake water environment.
Remediation of As and Cd contaminations by composite material additives in smelting site soil
Authors: Hu Xuewu , Zhong Juan , Liu Xingyu , Cui Xinglan , Zhang Mingjiang , Lv Ying , Ma Daozhi , Yan Xiao
Published: June 2021

Arsenic (As) and cadmium (Cd) in soil is a serious environmental issue. Exploring an efficient method for simultaneous immobilization of As and Cd in soils is of great significance. In this study, three types of composite material additives were selected to test their ability to immobilization of As and Cd simultaneously in soil of smelting site through leaching toxicity. Results showed that Fe-based composite material additives (SD) significantly reduced concentrations of As and Cd in solutions from SD1 and SD2 treated soils, signifying that certain Fe-based composite material potentially immobilization heavy metals in soil. While Ca-Mg-Si based composite material additives (C) and Si-Mg-Al based composite material additives (S) have a side effect in As immobilization. The conclusions were that Fe-based composite material may be used as effective in situ amendments to immobilization As and Cd simultaneously in soils.
Land Urbanization Quality in China: Evaluation and Spatial-temporal Variability
Authors: Lu Na , Liu Zhirong , Yu Huachen , Wang Miao
Published: June 2021

Based on the construction of an evaluation index system for land urbanization quality, this paper evaluates and analyzes the variability of spatial-temporal in land urbanization quality during 2005-2015 in China. Results shows that: (1) Among the three aspects of land urbanization quality, sustainable development capacity scores the highest, land urbanization development quality follows, land-population coordinated development is the lowest. (2) The quality of land urbanization in China is generally improving, and the spatial distribution has a “gradient difference”, showing a pattern of high east and low west. In conclusion, to improve the quality of land urbanization, all aspects should be considered comprehensively; each region should combine its own conditions to formulate strategies for improving the quality of land urbanization.
The Enlightenment on Emergency Management of Chemical Parks
Authors: An Ziliang , Wang Ning , Bai Dingsong , Yu Xintong , Liu Shaofeng
Published: June 2021

Under the trend of large-scale industrial production, the construction of chemical parks is booming. With the hot topic in the field of safety accidents in chemical parks, the public awareness of emergency management has increased remarkably. In response to the current fragmentation dilemma of chemical industry in China, it is necessary to improve the emergency management mechanism. In the paper, four evaluation strategies are proposed on the basis of existing research for the construction of emergency management system in China Chemical Industry Park.
International experience of garden waste recycling and its inspiration to China
Authors: Wenting Cai , Yan Chen , Kai Fu , Li Zhang , Yu Wang , Xiangchun Wang
Published: June 2021

The amount of garden waste produced in China is on the increase annually, but its recycling treatment attracts little attention, so that the recycling treatment rate stays low, which has gradually become an important issue that cannot be ignored for urban management. In order to better promote the treatment and re-utilization of garden waste in China, preserve resources, and achieve the sustainable development of urban ecology, a review is conducted in this paper on the experience of those advanced countries such as the United States, Japan and others in the policy-making, financial support and other practices of garden waste recycling, so as to provide the basis and reference required for the scientific, sustainable and reasonable practice of garden waste treatment and re-utilization in China.
Analysis and Optimization of Station Taxi Transfer Efficiency Based on Queuing Theory
Authors: Sun Sen
Published: June 2021

Nowadays, the pace of life is accelerating, and people are paying great attention to the efficiency and quality of travel. This article uses some unreasonable phenomena in the station taxi transfer area to study the relevant knowledge of queuing theory to establish the taxi transfer efficiency of the city’s external transportation hub Optimize the model, take transfer waiting time and operating cost as evaluation indicators, and verify with examples. The results show that the optimization model is feasible, and the queuing time and the total cost per unit time under the optimization scheme are significantly reduced, which improves the efficiency of passengers changing taxis. Finally, it evaluates the optimization results proposed above.
Study on Electrocatalytic Oxidation Technology of Domestic Sewage
Authors: Liu Sufei , Wang Juan , Li Ruozheng , Tian Ying , Teng Jilin , Li Zhengkun , Zhu Xia
Published: June 2021

Domestic sewage is treated by grapheme-based electrocatalytic oxidation process when adding salt or not. The results show that the removal rate of ammonia nitrogen and COD are 97.86% and 64.29% separately under the conditions of 1g/L salt, 4min residence time and 500A/m2 current density. The COD and ammonia nitrogen of produced water are 72.5mg/L and 1.35mg/L respectively which meet the comprehensive wastewater discharge standard of GB8978–1996, while the removal rate of ammonia nitrogen and COD are 97.22% and 74.55% separately under the conditions of 20 min residence time and 190A/m2 highest current density without adding any salt. The COD and ammonia nitrogen of production water are 57mg/L and 1.7mg/L respectively which meet the comprehensive wastewater discharge standard of GB8978–1996 too. In the experiment, about 95.11 % ~ 97.27 % of ammonia nitrogen is converted into nitrogen. The cleaning effects of the deposition by using hydrochloric acid and citric acid are investigated. The results show that the deposition can be cleaned by both of the 2% hydrochloric acid and 2% citric acid, but the immersion cleaning rate of citric acid which has residual left is slower than hydrochloric acid. The deposition can be thoroughly cleaned by cycle operation.
Effects of an invasive plant Palmer Amaranth (Amaranthus palmeri) on herb communities
Authors: Yi-ming LI , Xun-qiang MO , Qian-nan LI , Chen-huan Liang , Si-min Liu , Ya-wen Zhang , Zheng Zhang
Published: June 2021

Based on the investigation of vegetation samples in the university town of Xiqing District, Tianjin, this paper summarized the status of biological invasion of Amaranthus palmeri in Tianjin, and searched for the methods to suppress the biological invasion of Amaranthus palmeri, which laid a foundation for the study on the solution measures for plant invasion of Amaranthus palmeri in China.
Influence of contact area coefficient on the results of u-p formation dynamic equations of fluid-saturated porous media
Authors: Feng Chaoqun , Zhang Pei , Xu Chengshun , Du Xiuli , Yue Chong
Published: June 2021

The principle of effective stress is the keystone of modern physics, which becomes the basic difference between soil mechanics and general solid mechanics. Terzaghi’s effective stress principle has been controversial since it was put forward, especially for the calculation of effective stress, many scholars have revised it from different aspects. The pore pressure is reduced in all different modified formulas, that is, the pore pressure need to be multiplied by a pore pressure factor. However, the variation of pore pressure factor has always been ignored because the reduction of pore pressure is very small. In this paper, the effective stress expression considering the contact area coefficient is modified to the u-p formation dynamic equation, and the influence of the change of contact area coefficient on the dynamic characteristics of soil is studied.
Application of green-synthesized cerium oxide nanoparticles to treat spinal cord injury and cytotoxicity evaluation on paediatric leukaemia cells
Authors: Yiling Wu , Murakonda Gopi Krishna , Jarubula Ramu
Published: June 2021

Injury prognosis, and treatment are one of the major objectives of nursing care during the treatment of spinal cord injury (SCI). Here, we developed a novel, biocompatible Cerium oxide nanoparticles (CeO2-NPs) through biosynthetic approach that can be used for the treatment of spinal cord injury in nursing care. CeO2-NPs were green fabricated utilizing leaf extract of Azadirachta indica. The fabricated nanoparticles still maintained the cubic-structure that was revealed by the x-ray diffraction (X-RD) analysis. Transmission electron microscopy (TEM) images displayed the sphere shape of nanoparticles having 15 nm particle size. The stretching bands of Ce–O bond were noticed at 457 cm−1 and 451 cm−1 from the Raman and Fourier-transform Infrared (FT-IR) spectra, correspondingly. On the other side, biological investigations demonstrated that the single dose application of CeO2-NPs at nanomolar concentration is regenerative, bio-compatible and offers a considerable neuro-protective effect on the neurons in spinal-cord of an adult rat. Neuronal function retention is showed in electro-physiological (electrography) recordings and plausibility of its uses in preventing ischemic-insult is revealed from the assay of oxidative injury. This work explored the possibility of usage of prepared CeO2-NPs for SCI treatment. Furthermore, examination of green fabricated CeO2-NPs on paediatric leukaemia (CCRF-SB) cells were found to potentiate cytotoxicity indicating their therapeutic potential for future treatment of paediatric cancer. On the other hand, the current study also highlights the potential effect of CeO2-NPs on treatment of SCI through nano-based therapy.
Probing the waveguiding properties of quasi-2D organic semiconductor through optical imaging
Authors: Zhong Zhen , Gong Xiuduan , Lin Shenghuang , Yuan Jian
Published: June 2021

Though there have been many investigations focusing on organic semiconductors, how to fully probe their waveguiding properties is still rarely reported. In this work, the light propagation loss in the Znq2 samples was detected by a modified light transmission path. The results showed that the optical propagation loss coefficient of Znq2 nanorods is ∼0.16 dB μm−1. Our work fully reveals the waveguiding properties in 2D organic semiconductor by 2D & 3D imaging, which may offer a new reference for exploring novel optical properties of 2D organic semiconductors.