bluuebunny/crossref_metadata_2025_split huggingface dataset:
Whole Life Cycle Risk Assessment of Prefabricated Construction: A Structural Equation Modeling
Authors: Huang Zhu , Huang Ting , Peng Ying , Jiang Wen 
Published: June 2019

Abstract
With the rapid development of urbanization in China, prefabricated construction (PC) has attracted the attention of the public but PC is still in their infancy. Therefore, it is necessary to identify the risk factors of whole life cycle of PC. This paper adopts the structural equation modeling to analyze the data of the questionnaire and calculates the weight of each risk index. The research results provide decision makers with reference to the PC cycle risk, and also lay the foundation for the PC risk index system.
Forecast of Water Quality along the Luanhe River Line Based on BP Neural Network
Authors: Lin Hong , Kang Yuanbo , Wang Danyang , Lu Zeyu , Tian Wei , Wang Shuqian 
Published: June 2019

Abstract
In order to understand the changes of water quality in the water, the paper uses the improved BP network of LM algorithm to learn and train the data, and implements the neural network model on the MATLAB platform, and uses the processed samples for the established BP neural network. Learning training, in order to prevent some neurons from reaching the state of supersaturation.By normalizing the data, the trained network is used to predict the water quality indicators of the Luanhe River Line. The results show that it is feasible to evaluate the water quality along the sputum by BP neural network model. The model has strong learning, association and fault tolerance functions. The analysis results and process are close to the thinking process and analysis method of the human brain, which makes the water quality evaluation. The accuracy of the results is greatly improved.
Design Optimization of V-sector Ball Valve Core
Authors: Zhang Hao-nan , Wang Guo-feng , Zhao Qiao-nan 
Published: June 2019

Abstract
In order to solve the problem that the percentage characteristic of V-sector ball valve is poor at the relatively small opening degree, a design optimization flow of valve core is proposed for the first time. The process uses numerical simulation, sample mean evaluation and area average equivalence to calculate the equal percentage characteristics coefficient RQ
of DN65 V-sector ball valve core, and uses experiments to verify the rationality of the process, and further extends it to other models of ball valves. The results show that the original DN65 V-sector Ball valve core does not meet the equal percentage characteristics in the opening area of 28.6 % to 7.1 %. After the optimized design, the equal percentage characteristics coefficient RQ
of the ball valve core has been effectively improved, and the level of increase has more than doubled. And the equal percentage characteristics coefficient obtained by test exceeds the optimized design results. Further extended in the DN100 V-sector ball valve core, it is known that this optimization design method has universal applicability; V-sector ball valve core design optimization method is an efficient and reliable valve core design method, can improve the level of Valve core flow control, improve the valve core design ability.
Numerical Investigation of Flow Field Near the Exhaust Opening Indoor
Authors: Meng Chanjun , Yuan Bo , He Chuan , Xi Chunfu , Pan Liangming 
Published: June 2019

Abstract
Airflow field and effective region for pollution discharge were predicted around a circular flanged exhaust opening, three different turbulent models were employed to simulate airflow field near the exhaust opening indoor. Numerical results show that air velocity decreases gradually in radial direction and axis direction away from origin, and changes most dramatically at corner of the opening. The projection of velocity contour is similar to a semi-ellipse, but when the air velocity decreases, it gradually changes the hemisphere with larger outer radius. When the velocity is 2 m/s, the long axis of the semi-ellipse is 0.70 times the diameter of the exhaust port and the short axis is 0.45 times the diameter of the exhaust port. When the velocity is 0.3m/s, the diameter of the outlet is 1.60 times of that of the long axis and 1.55 times of that of the short axis. The effective area of pollutant emission is similar to the equivalent surface with velocity of 0.3m/s, and its shape is semi-elliptic.
Study on Fire Simulation and Safety Distance of Reactor Thermal Runaway
Authors: Chen Xin , Tao Gang , Zhang Lijing 
Published: June 2019

Abstract
With the development of chemical industry, fire and explosion accidents become more and more frequent. In this paper, a simple analysis is carried out based on the thermal runaway of the reactor, and the explosion simulation is carried out by using the fluent numerical simulation software, according to the standard turbulence model (k- Σ) and the component transport selected EDC- (vortex-dissipative) model. Simulation result intuitively show the pressure, temperature, speed and the relationship between the distance from the center of bums. The results show that the pressure, temperature and velocity decrease exponentially after a certain distance away from the explosion center, the relative safe distance is between 50 and 100 meters in the dangerous area within 50 meters, and in the 100 - meter outside pressure temperature back to normal for a safe distance.
Pretreatment of aluminium alloy milling wastewater by micro-electrolysis process
Authors: Li Ru , Huang Xin , Gu Junli 
Published: June 2019

Abstract
The aluminium alloy milling wastewater belongs to high concentration organic alkaline wastewater, the pH value is up to 13-14, and the COD concentration is 3000mg/L-3300mg/L, if direct discharge into water bodies without harmless treatment can seriously endanger the ecological environment and human health. In this study, the micro-electrolysis process was used to pre-treat the aluminium alloy milling wastewater, and the COD removal rate was the indicator. Under the condition that the mass ratio of iron to carbon is 1:2, the dosage of iron is 67g/L, the pH is 3, and the reaction time is 60min, the average removal rate of COD in aluminium alloy milling wastewater can reach 71.34%. The kinetic analysis of the process of pre-treatment of aluminium alloy milling wastewater by micro-electrolysis process is in accordance with the first-order kinetic model. The dynamic equation is:

C
t

=

C
0

exp

(
−
3.5762

C
0

−
0.6351

t
)

.
Analysis of soil structure effects based on geothermal deveplopment
Authors: Ge Yan. , Wu Ye. 
Published: June 2019

Abstract
With the deepening of people’s understanding of new energy, geothermal has become more and more "hot." The abundant geothermal resources of Henan Province will be an important resource pillar for the future economic growth of the Central Plains[1]. However, the vigorous development and utilization of geothermal resources will largely affect the soil structure. Through the data analysis of Luoyang A area, the influence of temperature change on soil structure was studied by using control variables and single factor experiment. The results showed that: with the continuous development of geothermal resources in Luoyang A area, the total amount of microbes, organic carbon and total nitrogen in the soil would chang with the increase of temperature.Among them, the number of microorganisms growed faster with the increase of temperature and reached the highest value up to 40 °C. As the temperature continuing to rise, the number of microbes growed slowly or on a downward trend.In order to avoid the influence of temperature changes on the soil structure, it is recommended to put insulation materials around the wellhead and the reservoir to prevent the lowest loss temperature from exceeding 30 °C or 3 wells alternating every other quarter[2].
Study on geomembrane seepage property of earth-rock dams
Authors: Peng Yunfeng , Si Dongdong , Wu Hailin 
Published: June 2019

AbstractAs an anti-seepage material, geomembrane is widely used in earth-rock dams engineering. However, the seepage calculation of geomembrane earth-rock dams has not been studied theoretically. According to the permeation mechanism of geomembrane, it can be divided into two categories: one is the permeability of itself; the other is the defect leakage flow. Based on the feedback analysis of the observation data of geomembrane of earth-rock dam, the average permeability coefficient of geomembrane is obtained. Finally, the error sources of clay emulation in seepage calculation of geomembrane earth-rock dams are discussed. The counting error is analyzed and the mathematical model is modified.
Research on the Adsorption Behaviour of Crystal Violet Simulated Wastewater on Fallen Willow Leaves
Authors: Li Wei , Tang Jiayu , Ma Hongfei , Li Zheng , Li Judi , Han Qiuju , Chen Chong 
Published: June 2019

Abstract
The adsorption of crystal violet (CV) simulated wastewater on the fallen willow leaves has been investigated. The effects of adsorption oscillating time, fallen willow leaves dosage, pH value, temperature and so on were examined of CV adsorption on fallen willow leaves, respectively. The result shows that the fallen willow leaves adsorbed the CV simulated wastewater well. The experimental data conformed to the Langmuir and Freundlich isotherm equations. The maximum biosorption capacity is 312.5 mg/g at 298K, which is superior to most reported biosorbents.
Research on New Artificial-Guided Bird Prevention Device Based on Bird Damage Characteristics
Authors: Sun Guang , Wang Dongsheng , Gao Shuyong , Cui Wenliang , Yan Jing , Wang Yu , Wang Jian 
Published: June 2019

Abstract
Aiming at the operation safety for transmission lines in east Inner Mongolia seriously threatened by bird-caused damage in transmission and transformation equipment, according to the analysis of the law of bird activities in east Inner Mongolia, it is found that 463 species of birds are exist in east Inner Mongolia, and the bird damages are mainly caused by larger birds. Through the application effect of existing anti-bird measures, it is found that the current bird-repelling anti-bird measures can reduce the number of bird damages. However, the actual application effect of the anti-bird measures is still limited based on the operational data. Therefore, the guided improvement measures based on the artificial bird guide are proposed, and the corresponding models are made. The comparison with several existing bird-prevention measures is carried out and the test show that the combination of bird thorn of anti-bird measures prevention and the bird guides have a better effect. It is expected that the research can provide reference for the bird disease prevention and control work for east Inner Mongolia Power Grid.
Performance of Autonomous Temperature Controlled Photovoltaic Modules with Water Film
Authors: Li Jinbao , Xi Zeyi , Wu Sen 
Published: June 2019

Abstract
In order to reduce the surface temperature of solar cells and reduce the surface dust and improve the power generation efficiency of PV modules, this paper introduces a cooling device for PV modules based on temperature self-regulation, including PV power generation, circulating water and temperature control system. The theoretical heat transfer model of the experimental device during operation is established. Set the temperature control interval of the temperature control system, and compare the test with the same type of panel with the no-surface film flowing at the same inclination angle. The research showed that when the average ambient temperature is 21.61 °C, the average temperature of the panel without water film cooling is about 35.37 °C, and the average temperature of the panel with the water film cooling is about 25.53 °C, which achieves the purpose of cooling and temperature control. At the same time, the output power of the water film cooling panel is relatively increased by about 13.57%. In summary, the water film cooling device in this paper can effectively reduce and stabilize the temperature of the PV module, reduce surface dust and increase its output power.
Laser infrared thermography detection for aviation carbon fibre composites
Authors: Wang Qiang , Qiuping Hu , Ming Liu , Liu Yang , Xinyi Li , Hongbin Zhou 
Published: June 2019

Abstract
Aviation safety is the focus of aviation field. In this paper, two different heating ways of modulated lasers were used to heat the aviation carbon fibre composites with internal defects. The results show that, after expanding, the unevenness of laser energy distribution has a great influence on the detection effect. In order to solve this problem, we obtained the reference temperature information by using the defect-free surface inside the specimen. After the difference between the obtained temperature information of the internal defect surface and the internal defect-free surface, the internal defect information of the specimen was successfully presented. At the same time, it is found that compared with the square wave heating, the effect of sine wave heating on detecting the internal defects of the specimen is more obvious. There are two main advantages of using laser infrared thermography to detect aviation carbon fibre composites: (1) the detection time is short, which only need a few seconds to complete the detection process; (2) the heating area can be adjusted by the distance between the specimen and the laser, which will make the detection more flexible.
Fault Characteristics of CFRC Unidirectional Laminated Plate Based on Acoustic Emission
Authors: Lu W X , Tang J J , Chu F L 
Published: June 2019

Abstract
Carbon fiber reinforced composites (CFRC) are increasingly being used as raw materials of important components in the industrial production owing to its characteristics of lightweight, high-strength and corrosion resistant performance, And acoustic emission technology, as a new nondestructive testing technology, is widely applied in the fault diagnosis of CFRC laminated plates. In this paper, the tensile failure test of unidirectional laminates is carried out. The acoustic emission technology is applied to analyze the typical faults, matrix cracking and fiber-matrix debonding. Based on principal component analysis and fuzzy c-means clustering, the two faults are identified, and the acoustic emission characteristics of CFRC laminated plates in the whole failure process are obtained, which may be helpful for actual fault diagnosis.
Finite element analysis on mechanical behavior of flange reinforced connections between wide-flange specially shaped composite columns and steel beams
Authors: Hongxue J , Jie G , Jie B 
Published: June 2019

Abstract
A parametric model for steel beam to wide-flange specially shaped composite column flange reinforced connection is analyzed by ABAQUS with varying parameters. The results are in good agreement with the experimental ones and the reliability of the calculation method is verified. Then the influence of the geometric parameters of the reinforcing plate on the stiffness, bearing capacity, plastic zone and ductility of the joints is analyzed. The results show that the triangle reinforcing plate can achieve the same effect as the trapezoidal reinforcing plate. The length of the reinforcing plate is 1 to 1.2 times that of the steel beam, the width may be 1/4 to 1/3 height of steel beam, and the thickness may be 1.2 times the steel beam flange thickness.
Influence of shield tunnel construction on neighboring building
Authors: Dai Jun , Liu Lei 
Published: June 2019

Abstract
The construction of underground project or the underground tunnel will influence the subsiding of neighboring building on the earth surface. In view of soil disturbance, 2D finite element method is adopted in this paper to study and shield tunnel construction of adjacent structures. Our research indicates that surface settlement together with force and deformation of the lining increase by the existence of buildings, simultaneously, additional stress and deformation of adjacent structure are induced during tunnel excavation construction. When L/D = 0.5 to 2, great surface settlement is produced with more settlement difference between building head and tail, and the building is in danger in the region. At the same time, the value of inner force also increases obviously. Out of the region, the influence on the buildings is ignored.
Numerical and experimental study the effects of river width changes on flow characteristics in a flume
Authors: Zhou S F , Wang X K , Yang Q Y , Huang Z W 
Published: June 2019

Abstract
The gradual characteristics of variations in transverse width often occur in mountain river because of the effect of geological conditions and river evolutions. This will influence flow and sediment transport due to the variations of flow structures resulted from the river width changes. A flume experiment that was conducted to explore how flow characteristics perform with the varied channel width, showing the connection of the flow parameters, flow rate and channel width. For example, the longitudinal water depth and velocity change along with the transition width of flume. On the other hand, a depth-averaged two-dimension model was proposed according to series of methods such as body-fitted coordinate, finite volume method, SIMPLER algorithm. The numerical results agreed well with the experimental observation in a flume, which showed that the model could reasonably simulate gradual channel transition flow. In addition, the validated numerical model was applied to simulate flow with different flow rates with the same imposed boundary condition in order to further analyse the effects of channel width variation on flow characteristics.
Experimental Study on the Strength of the Side Bored Pile After Post Grouting
Authors: Qinglan Qi , Yanqiang Gong , Liting Zhang 
Published: June 2019

Abstract
Due to different soil strengths, drilled bored piles and slurry-supported bored piles affect the side friction. Through the application of post grouting technology, the friction resistance and bearing capacity of piles can be improved. In this paper, an analysis was conducted on the strength increasing rule of the side drilled bored hole and the side slurry-supported bored pile after post grouting at different ages, by means of chemical reinforcement. The results show that: the post grouting technology has better effect on the slurry-supported bored piles, especially in poor ground conditions, and that the strength on the 120th day can be used as the design strength. Our research achievements can provide a theoretical basis for the post-grouting technology in engineering work.
BIM-based Fine Cost Management of the Whole Process
Authors: Zhang JiaYuan 
Published: June 2019

Abstract
This paper applies the fine management to analyze the specific work and existing obstacles in each stage of project cost management, then proposes that BIM could be technical support for fine management and solve the existing obstacles. On this basis, this paper expounds the concept and characteristics of BIM and demonstrates that the implementation of fine management in the whole process of cost management must be supported by BIM. Finally, based on the characteristics of BIM technology, the application framework of BIM in the whole process cost management process is proposed and the specific application of BIM technology in the whole process cost management is analyzed, which provides ideas and methods for fine management using in construction engineering cost management.
Numerical investigation of the backfilling material thermal conductivity impact on the heat transfer performance of the buried pipe heat exchanger
Authors: Song Xiao-qing , Jiang Ming , Qin Peng 
Published: June 2019

Abstract
Based on the in-site thermal response experiment of a shallow geothermal energy plant in Guiyang, a model characterizing the heat transfer process between well-backfill material-ground material of a buried double vertical U-tube underground heat transfer system is established. Moreover, the influence of the thermal conductivity of the backfill material on the heat exchange efficiency for the summer condition is investigated. Results show that the maximum error between the outlet water temperatures calculated from model and obtained from field testing is less than 1.7%, which verifies the correctness of the model. When the thermal conductivity of the backfill is low, the heat in the buried heat exchanger is basically limited in the domain of the borehole. Furthermore, it is observed that the heat transfer efficiency increases, as the thermal conductivity increases. When the thermal conductivity of the backfill is close to that of the surrounding rock, the heat transfer efficiency increases in a faster rate. However, when the thermal conductivity of the backfill further increases, the heat transfer efficiency insignificantly increases. It is found that higher thermal conductivity of the backfill material has limited improvement on the heat exchange capacity of the buried pipe.
The Three Memos—Analysis of “Vers Une Architecture” From the Perspective of Modern Architectural Development Practice
Authors: Jiang Yu 
Published: June 2019

Abstract
In “Vers Une Architecture”, Le Corbusier presents a complete theory of modern architectural design method and modern architectural aesthetics. Combined with the development of modern architecture, this paper reviews and analyzes the application of this theory in practice. Through these reviews and analysis, this paper attempts to prove that this theory still has a strong vitality in the current architectural practice. From the perspective of the development of modern architecture, some parts of this theory are flawed. This article also attempts to analyze and supplement these defects.
Brief discussion on the design of route selection in mountain areas of suspended monorail
Authors: Han Bing , Cheng-zhang OU 
Published: June 2019

Abstract
The design of route selection in mountain areas is the foundation and soul of survey and design of suspended monorail transport, which directly determines the project cost, operation cost and so on. As the corresponding technical standards or design specifications of the suspended monorail have not been formally promulgated in China, this paper expounds the structure form and technical characteristics of the suspension monorail, and analyzes the key points of the route selection technology of the suspended monorail in mountain areas in order to provide a reference for the similar project in mountain areas.
Research on Application of Reptilian Technology in Tax Management Achievements
Authors: Han Junhua , Zhou Quan , Han Heyang 
Published: June 2019

Abstract
In the era of big data and internet, huge network data increases the information asymmetry of tax collection and management, such as the aggravation of information asymmetry caused by new tax sources, single access to information, imperfect tax information sharing platform, and tax risk deficiencies, which brings about the problem of tax collection and management. But web crawler technology can automatically crawl on the Internet and search tax-related data, which greatly improves the ability of tax inspectors, the efficiency of tax management and the quality of tax service. There are some shortcomings in reptilian technology to improve.