bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of the combination of wetland and sewage treatment technology on the treatment of domestic sewage in Zhejiang province
Authors: Yao Jun Xiao 
Published: August 2020

Abstract
Sample from 25 A2O + horizontal flow constructed wetland (HFCWs) and 49 A2O + vertical flow constructed wetland (VFCWs) in Suzhou, Huzhou, and tested inflow and outflow (COD, NH3-N, TN, TP and SS), to evaluate the stability of the effluent and the rate of compliance. The effects of the two combined processes on the treatment of rural domestic sewage and their design and operation were compared and studied. The results show that the stable effluent compliance rate of A2O + VFCWs is higher than that of A2O + HFCWs. The effluent quality stability of A2O + VFCWs is better in winter, but worse in summer. The removal effect of the A2O unit in the two combined processes is not ideal, which may be related to the low carbon to nitrogen ratio of the influent and less sludge. Based on the above results, it is recommended that the county-level city proceed with upgrading and reconstruction in terms of structure and operation.
The relationship between sponge and water environment management in sponge city construction
Authors: Zhou Jinchao 
Published: August 2020

Abstract
Water resources are indispensable and substitute important ecological environmental resources in the process of sustainable development of human economy and society. At present, the shortage of water resources has gradually become an important bottleneck restricting the rapid and healthy development of our society and economy. Therefore, it remains of great practical significance to effectively protect and standardize the scientific management of China’s water resources. However, in contemporary theories of ecological environmental resources protection, due to the serious waste of water resources at present, the content needed for the effective protection of ecological environment water resources is also relatively large. In this study, the strategic concept of ecological environment management in sponge city is introduced for the effectual protection of ecological environment water resources and ecological environment management. This concept is one of the most significant ecological protection theories since the concept of water resources protection and ecological environment conservation management was formally born, and it can also be said to be the theme and basis of this research paper. I just hope the discussion of this paper can bring some help to readers.
Design and Application of Environmental Housekeeper System in Highway Engineering
Authors: Hongbo Xie , Yuehua Yang , Fangcheng Huang , Dong Zhang , Zhaoming Wang 
Published: August 2020

Abstract
Under the context of the rapid development of green highway construction, it proposed that “green” control is the key to the construction of green highway. In this study, the authors are taking the west freeway around in Hangzhou as the study area. According to characteristics of highway construction and the existing environmental problems, the authors are taking the environmental supervision of highway construction as the research content. They studied the model of environmental housekeeper, and developed the platform.
Characteristics and genesis of carbonate rocks’ hydrothermal dissolution in Laiwu Basin, Shandong Province, China
Authors: Yuanqing Liu , Le Zhou , Wei Li , Lin Lv , Xuemei Ma , Yidi Zheng , Shunxiang Meng , Qijun Deng 
Published: August 2020

Abstract
Through analysing the chemical composition of rock samples, investigating of hydrogeological points and hydrothermal dissolution geological points, the characteristics and mechanism of hydrothermal dissolution in Laiwu Basin were studied. The results show that the high temperature and high pressure magma intrusions resulted in hydrothermal metamorphic marbling of carbonate rocks in the contact zone. Hydrothermal fluids migrating along permeable faults, fractures can cause acidic hydrothermal dissolution and mixed dissolution in carbonate formation and formed dissolution cavities of different scales. The cavities are constituting groundwater enrichment space at present.
The Variation Characteristics of Temperature in Barrow Alaska During 1925-2018
Authors: Liu Zhaoyu 
Published: August 2020

Abstract
By using the Mann - Kendall mutation test, Morlet wavelet analysis, correlation analysis, linear trend regression methods, the variation of temperature in Barrow, from the Barrow Airport monthly temperature data, is analyzed during 1925-2018. The whole tendency of annual change of temperature in 94 years is rising, with the trend approximately 2.8°C/100 a. Before 1976, the mean annual temperature fluctuated downward, and after that, it showed an obvious upward trend nearly 9.3°C/100a, which indicated that Barrow experienced a process from cooling to rapid warming. Winter showed the most significant increasing trend among four seasons, with the average rate 4.27°C/100a, which is more than three times as high as that in summer (1.38°C/100a), right corresponding to the characteristic of Arctic amplification. The mutation of mean annual temperature occurred around 2005, and the value of temperature existed in a primary period of 15 years and a sub-cycle of quasi-8, quasi-28 years. At the end, great debates about the truth of temperature rising, mechanisms of Arctic amplification and the effect of it are demonstrated. The relevant conclusions are of reference value to the trend of temperature change in Arctic area and to the comprehension of Arctic amplification and global warming.
Pilot handle valve automatic test bench
Authors: Song Wen Tao , Jin Jian , Li Xing Ke 
Published: August 2020

Abstract
In order to test the performance of the pilot handle valve, the test system of the pilot handle valve is developed with LabVIEW measurement and control software, motion control card and XYZ three-axis servo motor. The oil contamination in the valve body is detected when testing the pilot handle valve. In view of the phenomenon that the flow is small and it is difficult to measure accurately when testing the pilot handle valve, the industrial camera is used for image processing and analysis of the leakage. Finally, the reliability of the test system is verified by theoretical analysis and experiment, which meets the requirements of the test-bed company and is accepted successfully.
Research on New Scheme of Electric Chassis Vehicle for Switchgear Breaker Handcart
Authors: Xiao Zhi-yuan , Liu Zhang-lei , Wu Xu-Dong , Chen Gong , Chen Jia , Yuan Pei 
Published: August 2020

Abstract
The electric chassis vehicle as a swing-in and swing-out unit of a 10kV centrally installed switchgear vacuum circuit breaker plays a vital role. This article introduces an electric chassis vehicle for 10kV centrally installed switchgear. This electric chassis has all the interlocking functions of the traditional chassis vehicle, and adopts high-precision ball screw, modular integral reduction motor and gear transmission, and the clutch is at the front of the beam. The bottom of the chassis is equipped with guide bearings, which are used in conjunction with special guide plates. This electric mechanism has the characteristics of high precision, low noise, smooth operation, and operation of electric and manual without manual switching, which can be directly operated. This technology can reliably improve the comprehensive technologies such as the reliability and mechanical life of electric chassis vehicle, and improve the reliability of the existing switchgear sequence control operation technology, making it possible to apply one-key sequence control operation, reducing the amount of personnel on-site operation workload and improving operation and maintenance efficiency, and reduce personal safety risks.
Optimal market trading strategy of load aggregator based on comprehensive demand response
Authors: Xu Nan , Wang Linfeng , Zhou Bo , Zhao Zihao , Nie Jing 
Published: August 2020

Abstract
With the development of smart grids, load aggregators can aggregate users’ responsive loads through advanced measurement equipment and communication networks to achieve demand response. Establish an integrated demand response (IDR) model in the electric-gas-heat multi-energy day-to-day market model, and then take the LA profit as the optimization goal to study the IDR-based electric-gas-heat optimal joint trading strategy. Through the comparative analysis of the traditional demand response (DR) and the proposed multi-energy market IDR model, it is verified that the proposed multi-energy market IDR model is not only conducive to improving the market profit of LA, but also can meet the multiple loads through the mutual assistance of multiple energy peaks and valleys demand.
Transducer and Testing Scheme Design of Phased Array Ultrasonic Detection for Wind Turbine Main Shaft in Service
Authors: Xu Zhengbin 
Published: August 2020

Abstract
The wind main shaft is the important component for connecting the hub and gearbox, transmitting axial thrust and rotating torque in a high-power wind turbine. Defects of structural damage occur more often in the main shaft bearing constraints front end surface based on the previous study. New type of phased array ultrasonic testing technology is used for the first time, and the theoretical design is dedicated to the wind main shaft detection of phased array ultrasonic testing customized transducer and scheme. A suitable transducer parameter range and detection scheme are determined well.
Phase Identification of Low-Voltage Users with Novel Grey Relational Analysis Method
Authors: Zhao Guowei , Zhao Rui , Gu Yuanjie , Chang Bo , Hu Changlong , Xue Yang 
Published: August 2020

Abstract
With the development of smart grid, the extensive use of advanced metering infrastructure (AMI) equipment further improves the lean management level of grid, which makes it possible to accurately analyse the power consumption information of low-voltage users. This paper proposes a novel algorithm for accurately identifying the phase of low voltage users. The algorithm is based on grey relational analysis (GRA). Data collected from independent users and buses are used for comparative analysis by proposed algorithm. In this paper, the algorithm and its experimental results in Hebei Province are introduced in detail. The results show encouraging results that the proposed algorithm can accurately identify the low-voltage users’ electricity phase, and the performance of the improved GRA algorithm is better than the traditional GRA. The proposed method also has better effect compared with other methods of phase identification.
Vibration Responses of SCR with the Installation of Monitoring Devices
Authors: Zhou Yisu , Zhang Long , Zhuang Ye , Li Jiaqi 
Published: August 2020

Abstract
In order to ensure the integrity and safety of deepwater risers during the development of deepwater oil and gas fields, the on-site monitoring technology of risers has become a research hot point in the field of marine engineering. Riser monitoring devices have large quality, which will change the vibration responses in practical engineering. In this paper, the vibration modality of a steel catenary riser (SCR) with monitoring devices is simulated in time domain using professional marine software Orcaflex, including static, dynamic and strength characteristics of SCR and is based on catenary method and centralized mass method. The effects of SCR vibration with and without monitoring devices are compared and analysed on the static characteristics, dynamic characteristics and strength.
Experimental Determination of Moisture Diffusivity of Birch
Authors: He Xiao , Wang Lianjun 
Published: August 2020

Abstract
Birch is one of the renewable biomass resources. The high moisture content of raw materials increases the cost of transportation and pelletization. Drying is an effective approach to reduce the moisture content of biomass before storage and other operations to a safe and manageable level. Moisture diffusion in wood could affect the drying process significantly. In this study, the drying process of Birch materials was modeled by Fick’s second law. Results from the experiment were utilized to determine the moisture diffusivity with parameter estimation. It showed that the diffusion coefficients of Birch increased from 1.2×10-7 to 9.6×10-7 m2 h-1 with the temperature ranging of 20-60°C. The trend of moisture diffusion coefficients followed Arrhenius equation with respect to temperature. For high-temperature drying, this model can help to terminate the drying process in a timely manner, thus conserving energy consumption.
Study on the distribution characteristics of “Characteristic Ring” in irregular cross-section ventilation roadway
Authors: Ding Cui 
Published: August 2020

Abstract
In order to study the airflow distribution in irregular cross-section roadway, the numerical simulation method were carried out to simulate the influence of hemispheres with radius of 100mm, 200mm, 300mm, and 400mm placed in different positions in the roadway on the distribution of “characteristic rings”. The results showed that concave body is not the key factor influencing the distribution of “characteristic ring” in ventilation roadway. Convex body is the key factor influencing the distribution of “characteristic ring”, the greater the ventilation velocity, the smaller the velocity gradient in the stable zone and the velocities in the stable area are more closely to the average velocity. As the increase of ventilation velocity, the velocity gradient is larger in transition zone. The size and position of the convex and concave bodies are not the key factors influencing the velocity distribution on the central axis of cross-section.
Spatial-Temporal Pattern of Novel Coronavirus Pneumonia (COVID-19) in Europe
Authors: Wang Wei 
Published: August 2020

AbstractFighting the Novel Coronavirus Pneumonia (COVID-19) is an urgent task and major concern in the world. As the core of public health events, Epidemiology is most concerned with spatial-temporal pattern. Based on the statistical data, this paper discusses the impact range and spread trend of the epidemic in Europe. The significance and suggestions for multi-scale assessment of the epidemic severity are put forward.
Industry Analysis of Recycling Application of Organic Waste Pyrolysis Co-production
Authors: Wen Enlong , Yang Wang , Xian Chunmei , Jian Liu , Fang Zhen , Huang Kun , Hu Chuntao 
Published: August 2020

Abstract
Pyrolysis technology is a new development direction in recent years, through the specific analysis of the technology in the industry, to guide the development of technology and enterprise investment. According to the application of the technology in the industry, the application of technology, market size, national industrial policy, industry barriers and market competition are analyzed comprehensively. The results show that the first, organic waste pyrolysis technology has a high operating cost and has no obvious advantages in market competition compared with incineration. The second, technology is not mature enough, poor reliability and stability. Third, the lack of relevant industrial policies on pyrolysis technology has an adverse impact on the promotion and application of technology. Fourthly, as a new environmental protection and green treatment method, pyrolysis is being paid more and more attention by relevant departments and enterprises.
Efficient Decomposition of Perfluorinated Compounds In a High Photon Flux UV/sulfite system
Authors: Gu Yurong , Dong Zijun , Chen Haijie , Li Yongbing 
Published: August 2020

Abstract
Perfluorinated compounds (PFCs) have attracted increasing attention due to their global distribution, high chemical stability and persistence. Hydrated electron (eaq
-) is a strong reductant, and is reported promising for recalcitrant organic pollutants decomposition. In this study, eaq
- based photodecompositon of several PFCs in a high photon flux UV/sulfite system was investigated. Perfluorosulfonic acids (PFSAs) and perfluorocarboxylic acids (PFCAs) decomposition in the studied system were 1∼2 orders of magnitude faster than that in previously studied BDD electrooxidation and UV/KI photoreduction systems. Kinetic study revealed the observed rate constant (Kobs) of both PFSAs and PFCAs increased with the increase of carbon chain length. In mixed PFCAs or PFSAs solution, decomposition of each PFCAs or PFSAs was suppressed due to the competition of eaq
-.
Numerical investigation of porous surface parameters on the performance of micro-channel reactor for hydrogen production by methanol steam reforming
Authors: Feng Yanbing , Li Xingzhan , Zheng Yueqing , Cui Hailong 
Published: August 2020

Abstract
To enhance the energy conversion of a micro-channel reactor with a porous surface for hydrogen production, the effects of structural parameters of the porous surface (surface area ratio, ratio of depth-diameter and distribution of pores) on the comprehensive performance of the reactor are numerically investigated. The CFD model is established to simulate the process of hydrogen production in the micro-channel reactor with a porous surface. Then, a series of numerical simulations with different structural parameters of porous surface are carried out. The distribution fields of flow rate, temperature, pressure and gas concentration can be obtained through the numerical analysis. Results indicate that with the increase of surface area ratio, the methanol conversion and hydrogen production rate is greatly improved, while the ratio of depth-diameter and distribution of pores have little effect on the performance. When the reaction temperature is 290 °C, the methanol conversion rate of the micro-channel reactor with a porous surface can reach above 90%.
Cadmium phytoremediation potential of Gnaphalium affine D. Don and physiological response in metal tolerance
Authors: Li Qiqian , Liu Xuhui , Qin Yongrong 
Published: August 2020

Abstract
In this study, the plant growth, physiological responses and phytoremediation potential of the herbaceous plant Gnaphalium affine D. Don were evaluated in varying extents of Cd contaminated soil and 40 days cultivation. The results demonstrated that the plant had a high Cd tolerance of up to 300 mg.kg-1 in which Cd content in roots and shoots reached a maximum of 733.9 and 404.6 mg.kg-1 respectively. Cd exposure enhances the malondialdehyde (MDA) level and antioxidative response (SOD, POD and CAT) in shoots of Gnaphalium affine D. Don. The bioconcentration factor (BCF) values in all treatments were greater than 1 and the translocation factor (TF) values were almost 2 at the high Cd concentration treatments. These findings indicated that Gnaphalium affine D. Don as a Cd-accumulator can be considered as a potential candidate for phytoremediation in Cd polluted sites.
Numerical calculation and analysis of parameters of collapsible loess treatment on composite foundation based on FLAC3D
Authors: Min Youwei 
Published: August 2020

Abstract
Combined composite foundation technology is one of the research directions for dealing with collapsible loess foundation in the northwest region. Under the vertical load of rigid-flexible composite foundation reinforcement, considering the relevant factors of rigid pile, flexible pile, cushion, etc., a FLAC3D finite element model was established for numerical analysis. The results of the research show that the length of rigid piles is the main factor affecting bearing capacity and settlement, and the main function of flexible pile lengths is to improve the strength of shallow soils and eliminate the collapsibility of loess. This paper provides a reference basis for the study of the combined composite foundation mechanism.
Construction of Fixed Bed Reactor and Catalytic Performance of the PS-ILs Enabled by Immobilized Ionic Liquids for Esterification
Authors: Zhang Jun , Wang Yanfang , Zhao Zhiping 
Published: August 2020

Abstract
Polystyrene (PS) microspheres, prepared by suspension polymerization, were applied to synthesize chloromethylated polystyrene microspheres (PS-CH2Cl) by chloromethylation. PS-CH2Cl was then used for the immobilization of acidic ionic liquid to prepare immobilized ionic liquid polystyrene microspheres (PS-ILs) as catalyst, thus avoiding the difficulty of ionic liquid separation. The structure of PS-ILs was characterized by SEM and FT-IR. PS-ILs was loaded in a fixed-bed reactor to catalyze the esterification of acetic acid and n-butanol. The experimental results indicated that the catalyst had good catalytic performance. The conversion rate of acetic acid was about 81.58% after 4 h reaction in the fixed-bed reactor.
Study on the Local Stability of Unidirectional Buckling Members of a New Type of Section Steel
Authors: Haiqiang Dai 
Published: August 2020

Abstract
The paper investigates the unidirectional buckling performance of lipped thin-walled U-shaped steel using numerical simulation with the finite strip program CUFSM. The local stability of the steel under compression at the opening side is studied. 33 different members are selected, each with a length of 2.5 m. All the members are divided into four series, and each series is used to investigate the influence of one parameter: the ratio of web height-to-upper flange width, the ratio of lipped height-to-upper flange width, the ratio of lower flange width-to-web height and the thickness of the plate. The laws of buckling stress, buckling mode and half-wave length of the member are analyzed. Finally, this paper gives a reasonable value range for these four parameters, according to which a reasonable cross section can be designed in the actual project, so that it can meet the needs of the actual project and has a certain economic index.
Heat Transfer Simulation of Large Caliber Gun Barrel
Authors: zhen Wang , jin Wei 
Published: August 2020

Abstract
During the continuous firing of artillery, the inner wall of the barrel will experience a continuous rise of temperature, which has much to do with the ambient temperature and the way it cools. For artillery using combustible cartridge, the temperature rise of the barrel’s interior wall will have a great impact on the safety of combustible cartridge during successive shots. The finite element model of gun barrel was established by ANSYS software while the convection heat transfer in the inner and outer walls of the barrel and the heat transfer in the barrel wall were simulated. This paper observed the temperature variation of the inner and outer wall of the barrel under different ambient temperatures and different cooling methods, revealing that the higher the ambient temperature, the faster the barrel temperature rises. Different cooling methods have little influence on the inner wall temperature, which would emerge long after shooting. The research provided theoretical basis for the safe use of combustible cartridge cases.
Study on the influence of barriers in the diffusion process of liquid hydrogen leakage
Authors: Wang Yawen , Chen Yanwei , Zhao Huiping , Xiong Yanyi 
Published: August 2020

Abstract
Based on the computational fluid dynamics method, a numerical model of large-scale liquid hydrogen leakage and diffusion is established. By simulating the diffusion process of hydrogen cloud when the obstacle is located at different positions, we get the motion law of cloud and the important time parameters of Cloud Diffusion reaching the dangerous range (combustible concentration). Compared with the process of liquid hydrogen leakage and diffusion under barrier-free conditions, it was found that setting an obstacle in the wind direction of the leakage port can accelerate the diffusion speed of the hydrogen cloud. The time to reduce the cloud concentration below the flammable range is reduced by 15%, therefor, can decrease the risk of fire; however, setting barrier in the downwind direction will lead to the accumulation of hydrogen cloud near the ground, and the time when the cloud concentration drops below the flammable range is 64% longer than the barrier-free working conditions, the possibility of serious secondary accidents was increased.