bluuebunny/crossref_metadata_2025_split huggingface dataset:
A simple model for predicting soil infiltration rate for vertical line source irrigation
Authors: Wang Ying , Gong Jiaguo , Fan Yanwei 
Published: September 2020

Abstract
In this study, HYDRUS-2D was used to simulate the soil infiltration rate of vertical line source irrigation (VLSI) under different soil textures and initial water contents, as well as for different lengths, diameters and buried depths of the line source. The soil texture, diameter and length of the line source are the dominant influential factors of the soil infiltration rate of VLSI, whereas the initial water content and buried depth of the line source are less influential. The variation of soil infiltration rate is in accordance with the Philip model. The model parameters, i.e., sorptivity (S) and steady infiltration rate (A), increase as the diameter (D) and length (L) of line source increases. A power function between S and D and L, and one between A and D and L, were established. The exponential value of the power function was determined based on the HYDRUS simulation results, thereby obtaining a simplified estimation model of the soil infiltration rate of VLSI containing D and L. The effectiveness of the simplified model was verified based on a laboratory experiment and currently available research. The MAE (mean absolute error, MAE) is 0.056–0.348, RMSE (Root mean square error, RMSE) is 0.073–0.442, PBIAS (percentage bias, PBIAS) is 1.642 – 2.893, and NSE (Nash-Sutcliffe efficiency coefficient, NSE) is close to 1 (NSE⩾0.973), indicating that the model has a high accuracy and can therefore be used for estimating the soil infiltration rate of VLSI. The simplified estimation model established in this study has only two undetermined parameters that can be obtained based on only one set of experimental data, simplifying the experimental scheme and improving the work efficiency.
The effects of urban park on residents’ health: an empirical study based on Tangxi River Park in Hefei
Authors: Wang Zhipeng , Zhang Chengyong , Chen Yawen , Liu Xiangfeng , Guo Jianghui 
Published: September 2020

Abstract
As an important way for urban residents to access nature environment, urban park has a certain degree of impact on the health of the population. In this study, Tangxihe Park in Hefei City was used as the research site, and the impact of urban parks on population health was quantitatively studied by analyzing the demographic characteristics, physical and mental health of park users, and park satisfaction. The results show that the quality of overall environment, green space and activity facilities of the park have a positive effect on improving the physical and mental health of the residents, the time of residents spending in the park have a positive effect on their physical and mental health, the longer of the residents spending in the park, the higher of the health benefits they received. Physical health regression analysis showed that residents received better physical health benefits by using the park between 6am to 9am compared to those entering the park between 12pm to 14pm and 14pm to 18pm. Mental health regression analysis showed that residents entering the park between 14pm to 18pm received better mental health benefits than those entering the park between 6am to 9am. The research results verify the specific health effects of urban parks in the context of Chinese demographic and geographic background, and enrich the theoretical content on the health benefits of urban parks in different regional contexts.
Research on UAV Large Scale Mapping and its elevation fitting
Authors: Lu Rongshan , Yang Xianli 
Published: September 2020

Abstract
Due to the influence of the external environment and the limitation of data processing methods, the accuracy of the unmanned aerial vehicle (UAV) aerial photogrammetry needs further studies in the aspect of mapping large-scale topographic maps. In order to verify whether the measurement accuracy of the UAV aerial photography system meets the requirements of large-scale topographic maps, this paper conducts an accuracy test on a topographic map, using the surface fitting model, the plane fitting model, quadratic surface fitting and polyhedral function method fitting based on field measured data. The fitting of four models to the elevation points by the combined polyhedral function method. The elevation difference between the flat area and the mountain area was corrected, and the elevation accuracy of the four methods was compared. This paper shows that in flat areas the elevation accuracy of the surface fitting model is better than the plane fitting model, quadratic surface fitting, and polyhedral function method fitting. In the mountainous region, the elevation accuracy of the quadratic surface fitting model is better than that of the plane fitting model, surface fitting model, and polyhedral function method.
Analysis and numerical simulation of the limiting factors of algal blooms in Qiantang River estuary
Authors: Li Ruohua , Pan Cunhong , Ge Can , Wu Xiuguang 
Published: September 2020

Abstract
Algal blooms generally occur in lakes and reservoirs rather than macro-tidal estuary. However, algal blooms repeated in the Qiantang River estuary, a typical macro-tidal estuary, which has seriously influenced the aquatic environment and water supply in Hangzhou. A coupled hydrodynamic-ecological model was established to explore controlling factors of algal blooms in Qiantang River estuary. Environmental variables were carried to study algal growth in which nutrients, water temperature and river runoff affect algal growth strongly in Qiantang River estuary according to the modeling. High nutrient concentration and temperature promote algal growth, and river runoff inversely. Substantially reducing on nutrient inputs is required to mitigate algal blooms due to high nutrient background concentration in the estuary, among which phosphorus reduce is more effective than nitrogen. In addition, more water should be discharged from the upstream reservoirs to suppress algal blooms in the drinking water source area of Hangzhou in summer.
From sponge city to sponge watershed: addressing comprehensive water issues through an innovative framework
Authors: Xue Fei , Wang Jian , Huang Yilong , Jing Ruiying , Lu Qiaohui 
Published: September 2020

Abstract
This paper advocates a shift for Sponge City construction from urban scale towards the watershed scale through strengthening the ecosystem services at a holistic perspective. An innovative framework has been established to address integrated solutions for comprehensive water issues. It enclosed with water resilience pattern, water resource pattern, water treatment pattern, water ecology pattern, waterscape pattern, and LID (low-impact-development) transportation pattern. Specifically, water resilience pattern and water resource pattern deal with the livelihood issues of urban population; water treatment pattern and water ecology pattern provide a sustainable basis through ecological and technical approaches in the context of urban agglomeration. Besides, the waterscape pattern and LID transportation pattern correlated grey infrastructure with green infrastructure, which helps to optimize the quality of urban development and minimize the intervention on the watershed ecosystem. The analyses and discourses from this study identify significant methodological implications to shift the sponge city practice from the urban context towards nature context. The prominent contribution is to optimize the regulation and support service of the watershed ecosystem and promote a healthier environment for people and wildlife living in the watershed.
Stability analysis of offshore wind power monopile foundation under wind load
Authors: Jin Jianli , Hu Cong 
Published: September 2020

Abstract
Based on the calculus and blade element theory, the formulas for calculating wind load on the blade of offshore wind turbine are deduced. The time history curve and wind speed time history curve, power spectrum and wind load of wind turbines are simulated by using MATLAB software with the derived formulas and wind observation data of London Array Wind Farm. Based on the above analysis results, the stability of offshore wind power monopile foundation structures under wind loads is analyzed and studied by using ABAQUS finite element software. It is concluded that the structural stability and ultimate load of offshore wind power structures under horizontal, lower bound and ultimate loads are the same. With the increase of internal friction angle, the shakedown load and ultimate load increase gradually with the increase of pile foundation length.
The application of TOUGHREACT in the field of energy and environment
Authors: Li Lian , Wu Yahong , Chong Shan , Wen Qingzhi 
Published: September 2020

Abstract
TOUGHREACT has been widely used as a chemical reaction simulation program for non-isothermal multiphase flow in pore and fracture media. By analyzing the comprehensive research results, the application status of TOUGHREACT in CO2 geological storage, geothermal energy development, nuclear waste disposal, mineral recovery and silica fouling and environmental pollution remediation are summarized. Finally, the future development trend of TOUGHREACT is also analyzed. It can be used as a reference for the future application of TOUGHREACT in the field of energy and environment.
Geochemistry characteristics and emplacement mechanism of the Cenozoic magma in Baoxingchang area, Yunnan Province, SW China
Authors: Dao Yan , Jian Long , Zhang Yourong , Xiao Gaoqiang , Xu Shengchao 
Published: September 2020

Abstract
Alkali-rich intrusions associated with Cu-Mo mineralization in Baoxingchang district, displaying both felsic and mafic rock series, can be: divided into four evolution stages. LA-ICP-MS zircon U-Pb ages of the four stages intrusions 36.5∼34.6Ma, 38.0∼33.5Ma, 36.0∼34.5Ma and 34.0Ma, respectively. All the studied rocks have similar magma sources and tectonic setting. The εHf(t) values indicate that they were reworked by ancient lithospheric mantle and crustal materials via subduction. Formation of the alkaline-rich intrusions in Baoxingchang area may be involved in the processes of partial melting of mantle rocks, crust-mantle materials and fractional crystallization. It appears an increasing tendency from felsic intrusions, to enclaves and then to early-stage lamprophyre to late-stage lamprophyre.
Comparative analysis of strain parameter acquisition based on Cave strain and GPS observation
Authors: Hu Leyin , Lv Taiwen , Yan Rui , Fan Zhiyong , Xu Bin 
Published: September 2020

Abstract
A set of three-component extensometers are installed on the Xibozi Seismic Station in Yanqing District, Beijing. The layout of the extensometers is an isosceles triangle, and the observation is the amount of expansion and contraction of each side, which is then converted into the strain value of each side. In this paper, the regional crustal strain parameters were calculated based on the observations of the extensometers and the continuous GPS observations around Xibozi Sesimic Staion. From two aspects of observation at the same site and different scales, the ground strain information reflected by the two observation methods is compared and analyzed. From the strain parameters calculated by a single point (extensometers) and the strain parameters calculated by the triangular surface observation (GPS) with different specifications, the overall Beijing area is in the context of tensile strain. However, there is a gap of several orders of magnitude between the two results, which may be related to the artificial operation of the pre-processes such as zero drift and step removal of the instrument’s strain observation data.
Micro Dry Wire EDM: Kerf Investigation using Response Surface Methodology
Authors: Ali Mohammad Yeakub , Banu Asfana , Rahman Mohamed Abdul , Al Hazza Muataz Hazza , Khan Chowdhury Ahmed Ghalib 
Published: September 2020

Abstract
Dry electrical discharge machining (DEDM) is an environmentally friendly and green machining process where it uses gas as the dielectric fluid instead of liquid. It is an alternative to the conventional electrical discharge machining (EDM) process. However, kerf variation remains as a critical issue in micro dry wire EDM (µDWEDM) process. Therefore, the objective of this research is to investigate kerf in µDWEDM using response surface methodology (RSM). The experimental investigation was perform using an integrated multi process machine tool, DT 110 (Mikrotools Inc., Singapore). Stainless steel (SS304), tungsten wire, and compressed air were used as the workpiece, electrode, and dielectric fluid respectively. Central composite design (CCD), a type of RSM, was used to design the experiment using two controlled parameters which were capacitance and gap voltage. Analysis of variance (ANOVA) was used to analyse the results and to evaluate the adequacy of the developed model. The results were obtained by measuring the kerf using scanning electron microscope (SEM) (JEOL JSM-5600, Japan). An empirical model has been developed, and it was found that both parameters; capacitance and gap voltage have high influence on kerf. The optimum parameters for minimum kerf were found to be 0.1 nF capacitance and 91 V gap voltage. The developed model was found to be adequate since the percentage error was relatively small (≈ 2%).
Non-contact Detection of Delamination in Cu/Al Laminated Plate with Laser Ultrasonic
Authors: Ji Baoping , Zhang Qingdong , Zhang Liyuan , Cao Jianshu , Zhang Boyang 
Published: September 2020

Abstract
In this paper, a non-contact non-destructive inspection method based on laser ultrasonic was proposed for the detection of interface delamination in Cu/Al laminated plates. The finite element model of laser ultrasonic Cu/Al laminated plates were built to analyze the propagation of laser ultrasound in Cu/Al laminated plates and the effects of interface delamination defects on the ultrasonic field distribution. The simulation results were verified by the laser ultrasonic detection system. The C-scan detection results realizes the visual detection of delamination defects, and provides precise information about the composite quality of the Cu/Al laminated plates. Experimental results show that laser ultrasonic technology has great potential for online non-contact detection of Cu/Al laminated plates.
Kinematics of Planar Quabody Mechanism with More Kinematics Bifurcation Positions
Authors: Li C M , Cao H , Liu Q , Liu X 
Published: September 2020

Abstract
Based on multibody dynamics, some definitions of mechanism are defined. The kinematics bifurcation position is a cold researching spot for many many years. It is common in planar quabody mechanisms but has not been paid enough attention to. The kinematics bifurcation position refers to the mechanism position with a pressure angle of 90° of the follower, including the stuck position (dead point). In this paper, a planar quabody mechanism is studied. In a motion cycle, there are three kinematics bifurcation positions in the mechanism. The third derivative of angle to time, angular velocity, angular acceleration of the connecting rod in kinematics bifurcation positions is obtained by solving the kinematics parameters of kinematics bifurcation positions according to L’Hopital’s rule. If the driving body swings in sinusoidal law, the motion of the mechanism is continuous. The kinematics characteristics of the mechanism are independent of the simulation convergence and response bifurcation of nonlinear dynamics. The length of the rocker is 1 m, the length of the connecting rod is 0.5 m, the distance between the track of the slider and the fixed point of the rocker is 0.5 m, and the rocker swings according to the sine law with a period of 9 seconds. The computer simulation shows that the speed and acceleration are continuous and so there is no impact in the kinematics bifurcation positions.
An Approach to Suppress Flow Separation by Plasma Vortex Generator as a Combined Active and Passive Control Mechanism
Authors: Mukut A N M M I , Afroz H M M , Mizunuma H , Hiromichi O 
Published: September 2020

Abstract
Flow control is an important issue in fluid mechanics and aerodynamics as separated flow introduce undesirable impact on overall system performance. Several active and passive techniques have been used to control the flow when necessary. But in passive control techniques, the actuator has to be fixed on the surface so that it can create vortices along streamline to enhance the mixing in the separated region to delay or suppress separation. Among passive flow control system vortex generators (VGs) are generally used but it control the flow with the cost of drag increase. It would be advantageous by combining both active and passive flow techniques together. In this regard plasma actuator (PA, active flow control device) and VGs are combined together with a view to not only suppress the separation but also minimizing the drag that could arise by using conventional passive control techniques. The combination flow control device is named as Plasma Vortex Generator (PVG) which proves its effectiveness to control separation as conventional VGs do but without any drag penalty.
Research on Equivalent Thickness of Oil and Gas Spring Damping Valve
Authors: Chen Yijie , Han Xiaoling , Xiang Lang , Zhao Ning , Dai Jianjian 
Published: September 2020

Abstract
Analytical algorithm for deflection analysis of superimposed throttle plate of oil and gas spring damping valve was studied, the theory of equivalent thickness of superposed valve plates was put forward, it can accurately calculate the equivalent thickness of a single valve plate corresponding to the superimposed valve plate groups, which greatly facilitates engineering calculations. After that, the boundary flow theory was used to derive the flow expression of the gap under the turbulent state. The relationship between the output force and displacement of the oil and gas spring was simulated and analyzed, compared with experimental data, the correctness of the mathematical model was verified.
Study on Calibration Technology and Uncertainty Evaluation of Asphalt Vacuum Decompression Capillary Viscometer
Authors: Liu Chang , Zhou Yishu , Ren Lishuo , Zhang Jinning , Zhu Fenghua 
Published: September 2020

Abstract
60 °C dynamic viscosity is one of the main indexes to evaluate the quality of asphalt products, and its influence on the quality of asphalt pavement is very important. 60 °C dynamic viscosity is usually measured by the asphalt vacuum decompression capillary viscometer (hereinafter referred to as the viscometer). The quality of the viscometer directly affects the test results of the asphalt dynamic viscosity. Therefore, it is urgent to study the detection method of viscometer to ensure the quality of the viscometer and the accuracy of the test results. In this paper, the calibration test method of viscometer is established, and the uncertainty evaluation is carried out, which provides a technical basis for ensuring the accuracy of viscometer.
The King of the New Generation Photovoltaic Technologies——Perovskite Solar Cells & the Opportunities and Challenges
Authors: Chen Qianyu 
Published: September 2020

Abstract
Within the past several decades, photovoltaic technology is an emerging pioneer in the renewable energy field. Driven by the rapid decline in the price of photovoltaic products, the cost of photovoltaic power generation is becoming cheaper or even lower than the cost of thermal power generation. Among various photovoltaic technologies, organic-inorganic hybrid perovskite thin film solar cells are promising candidates for the next generation of solar cells in consideration of their outstanding advantages such as low-cost, easy manufacturing processing and high power conversion efficiencies. Perovskite solar cells stem from dye-sensitized solar cells. Within less than a decade of rigorous research and development in perovskite solar cells, the efficiency is boosted up to 25.2%. Aforementioned high PCE is mainly attributed to outstanding photovoltaic properties such as the long diffusion length of carriers, high optical absorption coefficient, excellent carrier mobility, etc. Meanwhile, the main barriers of commercialization for the perovskite solar cells are the poor stability of the devices, and the possible environmental pollution caused by lead. Herein, we briefly reviewed the opportunities and the challenges of this game changer in photovoltaic field. The development prospective are also discussed.
Similarity Model Development of Spar Floating Wind Turbine for Vibration Experimental Study
Authors: Huang W.Q. , He E.M. , Yang J.J. 
Published: September 2020

Abstract
As the fixed foundation wind turbine no longer meets the design and cost requirements in deep sea power plant, and the offshore floating wind turbine (FOWT) suitable has been developed rapidly. The spar FOWT model is established in ANSYS-AQWA, and the influences of spectral peak frequency and incident angle for irregular waves on the vibration responses of FOWT are studied under five load cases. Under the guidance of similar theory, 1/150 scaled model has been simulated under typical load cases. The results show that the peak frequency of the spectrum has a significant effect on the vibration responses of FOWT, the incident angle also has a slight effect. By comparing the maximum and standard deviation (SD) of the tower top fore-aft displacement (TTDspFA) with the physical model and the experimental model, the minimum errors are 3.60% and 3.56%, respectively. This work will lay a foundation for experimental study on vibration of the floating wind turbine.
Optimization of Aviation Wireless Sensor Network based on Discrete Cuckoo Search Algorithm
Authors: Yang Rui , Xu Mengying , Zhou Jie 
Published: September 2020

Abstract
Aiming at the problems of multiple coverage blind areas, poor monitoring quality, and low utilization of sensor network nodes in aviation wireless sensor networks, a discrete cuckoo search (DCS) is proposed, and an objective coverage optimization function is established. Aiming at the fact that the previous cuckoo search is not suitable for discrete values, the binary code conversion formula is used to perform binary code conversion on the jump path of each position update of Levy flight, which makes the algorithm converge faster and avoids the limitations of local search. In the simulation, the discrete cuckoo search was compared with ant colony optimization (ACO) and particle swarm optimization (PSO). Simulation experiment results show that the proposed discrete cuckoo search (DCS) has a great advantage in convergence speed, more targets are detected, and the target coverage in the aerial wireless sensor network is effectively improved.
Creative Design of Streamline Groove Mechanical Seal Based on TRIZ Theory
Authors: Heshun Wang , Lei Zhou , Liu Xiaoming , Zhang Chening , Wang Zeping , Zhu Weibing 
Published: September 2020

Abstract
In view of the problems of poor stability and large leakage of dynamic pressure non-contact mechanical seals in a specific working environment, through the analysis of the mechanical seal principles and end structure, based on the TRIZ theory, choose the “structure stability”, “adaptability and versatility” as the improve elements, the “harmful emission” and “foreign harmful factors” as the deteriorate elements. The principle numbers of the invention are obtained from the contradiction matrix. According to the principles of the invention, a new type of streamline groove mechanical seal is designed. Through the technology of making groove on the end face, a fluid film with a certain stiffness is obtained, and the end face is sealed. Through improve the stability and adaptability of the mechanical seal operation, it can operate safely and stably in a specific working environment and meet the requirements of the seal.