bluuebunny/crossref_metadata_2025 huggingface dataset:
Mechanical Effect Analysis of Joint Surface of Rock with Different Roughness
Authors: Ke Changren , Lei Xinlin , Liu Zhuojun
Published: December 2019

Using the same material to make test blocks with different undulating angles for straight cutting test, the correlation between peak strength and residual strength values and the undulating angle and deformation characteristics of the section surface is studied, the residual strength criteria obtained fit with the existing strength criteria, the use of matrix calculation method, parameter correction, and the revised strength criterion.
Ring-shear Test and Constitutive Model of Surfaces between Clay in Nanchang Area and Different Roughness Contact
Authors: Liang Haian , Chen Haikang , Hu Qingbo , Zhang Longpeng , Liu Chao
Published: December 2019

The shear failure characteristics of soil-structure planes are the internal mechanism of slip deformation of foundation structures and strata, and it is an inevitable and important problem in engineering. In this paper, the shear tests of silty clay and structural planes with different roughness in Nanchang area are carried out by using the modified shear apparatus, and the statistical piecewise constitutive model of shear damage based on Weibull distribution is established. The results show that the shear stress-shear displacement curves of contact surfaces with different roughness exhibit strain hardening and strain softening phenomena; the peak shear strength and the final residual strength of the contact surface increase with the enhancement of the roughness of the contact surface and the normal stress applied on the contact surface; the statistical piecewise constitutive model of shear damage based on Weibull distribution achieves the elastic-plastic properties of the contact surface well. The strain softening phenomena at the deformation stage after the peak value is in good agreement with the experimental curves.
Experimental study on Bijie Cement Improved Red-Clay
Authors: Fang Juan , Gan Hongjiang , Zhu Jiaai , Liu Chunlian
Published: December 2019

As there was a large amount of red clay distributed in Bijie, which is used as the foundation of building and roadbed. To study the improvement effect of cement content on the Bijie red-clay, the typical red clay in Bijie was firstly sampled and the basic physical property indexes were tested. Then, the samples with different cement ratio were made and the unconfined compressive strength test was carried out. The results indicate that the strength of cement red-clay was increasing with the cement ratio increasing, and the improved effect is obviously, but the variation curve is not linear. The peak strength appeared when the cement ratio is 10%, after that ratio, the strength was decreasing with the increase of cement ratio. The reason is that the incorporation with cement makes Bijie red-clay harden because of the hardening cement.
Displacement Prediction Model for Concrete Dam Based on PSO-GBDT
Authors: Jun Zhang , Jian Mo , Jiemin Xie , Zuohong Meng
Published: December 2019

Displacement plays a vital role in concrete dam safety monitoring data. It is affected by a multitude of factors such as water pressure, temperature, structure stiffness, and bottom bedrock settlement. A displacement prediction model based on gradient boosting decision tree (GBDT) is proposed to make accurate predictions. Meanwhile, particle swarm optimization (PSO) algorithm is used to optimize the model parameters, including learning rate, the trees’number, the maximum optional variables, and the maximum depth of each tree. Finally, a real-world radial displacement dataset is used to compare the performance of the PSO-GBDT model, the multiple linear regression model (MLR), and the stepwise regression model (SR). The results indicate that the PSO-GBDT model achieves the best performance. Moreover, the model can also analyse the importance of each variable, which has substantial practical value.
Study on Design Method of Cold-formed Steel Beam with No Axis of Symmetry Section
Authors: Guo Penggang , Chen Xiangrong , Zhang Qingyu , Zhang Pingping
Published: December 2019

The paper mainly describes the detailed study resulted on bending carrying capacity of two kinds of cold-formedsteel beam with abroach and asymmetric section. This paper has completed 9 groups tests of torsion bending, and totally 12 specimen based on the current theory, deducing the critical moment of asymmetric section under lateral loading, providing the formula of coefficient of integral stability, and compared with tests results determined the simplified formula for engineering design.
Analysis of heat treatment defect of load-bearing metal parts of high voltage circuit breaker mechanism
Authors: Feng Chao , Xie Yi , Wang Jun , Long Yi , Li Dengke , Liu Weike , Ouyang Kejian
Published: December 2019

Failure analysis was carried out on the circuit breaker gear damaged in operation. Various detection methods were applied including composition analysis, hardness testing, metallographic observation, fracture scanning analysis and so on. The failure reason was found out to be improper heat treatment process, and corresponding rectification opinions were also put forward.
The study on material defects of structural parts of circuit breaker
Authors: Feng Chao , Xie Yi , Wang Jun , Long Yi , Li Dengke , Liu Weike , Ouyang Kejian
Published: December 2019

The fault of circuit breaker is caused by the defect of metal material. A series of tests including design drawings, physical and chemical tests, composition tests and metallographic observation, have been carried out for the failed springs. The experimental results showed that the failure of energy storage springs was caused by combination of design flaws and improper heat treatment process. At the same time, the corresponding noteworthy key points in the process of material production were put forward.
Fenton-like Prussian Blue Coated Magnetic Hollow Fe3O4 Nanocomposites for Dye Removal
Authors: Shi Weilu , Li Jinghua , Li Xiaonan , Tian Siqi , Zhao Yan , Li Guangda
Published: December 2019

In this work, Prussian blue (PB) coated magnetic hollow Fe3O4 nanoparticles (PB@Fe3O4NPs) were fabricated to degrade two modal dyes in wastewater via a typical peroxidation. Typically, the as-prepared PB@Fe3O4NPs were found to present intrinsic Fenton-like catalytic capacity and could catalyze the modal peroxidatic reaction for dyes degradation. Meanwhile, the obtained PB@Fe3O4NPs could be easily separated from the reaction solution by an external magnet since the magnetic Fe3O4 core for cyclic utilization. The relative removal efficiency of the PB@Fe3O4NPs was still above 80% after 10 cycles, which showing excellent recycling performance.
The Investigation of Corrosion Property of The Four Coatings in The Transformer Substation Soil
Authors: Xu Song , Wan Tao , Zhou Kai-bin , He Zhi-qiang , Huang Hai-bo , Huang Ying , Zhou Ting , Mao Wen-qi , Wu Jie-jun , Wei Jia-qiang , Gong Shang-kun , Liu Kai
Published: December 2019

Pure Al coating, AlSi alloy coating, NiAl alloy coating and 316L stainless steel coating were prepared on the Q235 steel by arc spraying technology. The corrosion of the four sprayed alloy coatings in the 220kV transformer substation soil and soil solution was studied by buried specimens and electrochemical test in Hunan. The corrosion behaviors of the coating steel samples in transformer substation soil solution were investigated by line polarization, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests. The results show that the best corrosion resistance of the four sprayed alloy coatings was AlSi coating, sequentially in the order of NiA1 and stainless steel coating, and the Al coating was easy bouffant at long time in the underground, so that the corrosion resistance is not good.
Analysis on coordinated development of prefabricated construction industry, regional economy and ecological environment——taking Beijing-Tianjin-Hebei region as an example
Authors: Qianqian Li , Zhaohui Duan , Likun Zhao , Yingbo Ji
Published: December 2019

Taking eleven prefecture-level cities including Beijing, Tianjin and Hebei as research objects, this paper established an evaluation system for coordinated development of the prefabricated construction industry, regional economy and the environment. Additionally, the weighting TOPSIS method was adopted to assess the overall development level of three major systems in this region and the evolving relation of coupled coordination for three systems in provinces and cities of Beijing-Tianjin-Hebei region was analyzed from time and space dimensions based on the coupled coordination model. The results show that prefabricated construction industry and regional economies in Beijing-Tianjin-Hebei region have relative relevance, but there is no significant conflict between economy development and ecological environment. From time, it is found that coupled coordination degree of three major systems keeps stable and rises with fluctuation and the main restriction factors of coupling development in each province and city are different.
Dynamic Correlation Analysis of Construction Industry Development Level and Science and Technology Innovation
Authors: Wang Qin , Qi Yuan
Published: December 2019

This paper analyzes the relationship between the technological innovation of the construction industry and the development level of the construction industry from the perspective of input and output in the construction industry. Using the time series data from 1995-2017, a vector autoregressive (VAR) model was established. The article uses co-integration analysis, Granger causality test, impulse response function and variance decomposition method to study the index variables. The long-term equilibrium relationship and short-term fluctuation effects between China’s construction industry development, construction industry science and technology innovation investment and output are analyzed. The results show: there are long-term equilibrium relationships and one-way causal relationships between the three variables, and there is time lag. The output of science and technology innovation in the construction industry is positively responded to itself, the development level of the construction industry and the investment in science and technology innovation in the construction industry. Among them, it is most affected by the fluctuation of investment in science and technology innovation. Compared with the development level of the construction industry, the contribution of scientific and technological innovation to the output of scientific and technological innovation is even greater. Finally, relevant policy recommendations for the development of the construction industry and technological innovation in the construction industry are given.
Numerical Simulations of Seismic Responses of Concrete Segments for Tunnel Linings in Shenyang City
Authors: Yu He , Li Shouju
Published: December 2019

In order to evaluate the influence of seismic action on internal forces on segments, the seismic responses of concrete segments for tunnel linings in Shenyang city are numerically simulated with finite element method. The seismic inputs acting on bottom of FEM model are modified in order to make peak value of accelerations on ground surface equal to 1m/s2 based on code for seismic design of buildings. The investigations show that, by comparing with those of the seismic inputs on bottom of FEM model, the predominant frequency of ground surface movements is significantly modified because the soil has an important filtering effect. By comparing with the peak value of accelerations of seismic inputs on bottom of FEM model, the peak value of accelerations on ground surface is only amplified as 1.57 times because the elastic moduli in different soil layer have little different. The maximum bending moments on segment linings induced by static soil loading are 496kN·m. The maximum bending moments on segment linings induced by seismic loading are 58kN·m. The maximum bending moments on segment linings induced by static soil loading are located in roof, floor and two side walls. However, the maximum bending moments on segment linings induced by seismic loadings are located in left and right spandrels. On those sites, the bending moments induced by static loading approaches zero. By comparing with the maximum bending moment on segment linings induced by static soil pressure, the maximum bending moment superposed by static and dynamic loadings only increases 0.4%.
Research on Reasonable Spacing of Adjacent Highway Plane Intersections
Authors: Peng Yuhua , Ye Ying , Wu Xuezhu
Published: December 2019

In China’s relevant specifications, the minimum spacing of plane intersections is simply defined according to the grade of highway, and the design speed of intersections and the influence of intersection geometry are not considered. In this paper, the traffic flow characteristics of road sections, the influencing factors of the intersection of road intersections and the sections between plane intersections are divided into entry points. The intersection functional zone and the length of smooth running zone are theoretically analysed. According to the influence of factors, the length of each segment is calculated separately, and the reasonable spacing index of the intersection is proposed.
Research and Practice of Mass Concrete Foundation Project Design of Modong No.4 Bridge
Authors: Chen Junxiang , Deng Nianchun
Published: December 2019

Modong No.4 Bridge is an important part of the water environment improvement project in Guangxi Laibin City, Guangxi. Its site conditions are extremely complex. After extensive research and demonstration, considering safety, practicality, economy, beauty and environmental protection, the design proposal was put forward according to local conditions. Abutment foundation uses ultra-high rigidity to expand deep foundation, which makes foundation pit construction extremely difficult. In order to achieve the optimal implementation of the recommended scheme of the bridge, the key technologies and quality control points of mass concrete foundation construction are studied and put forward. The feasibility of the design scheme is improved to the greatest extent, providing an effective reference for similar bridge construction.
Unconfined Deformation Characteristics of Collapsed Soil Based on Close-range Photogrammetry Technology
Authors: Lili Zhu , Xiaoming Zhang
Published: December 2019

Benggang is a special type of landform type that exists in the hilly areas of tropical and subtropical hills in the south of China. The water and soil erosion occurring on the collapsed land is different from other types of erosion. Its occurrence and development are characterized by uncertainty and rapidity, which seriously threaten the ecological environment and human settlement security. The intrinsic geotechnical characteristics of the soil are a major factor affecting its formation and development. The unconfined compressive test plays an important part in the study of the mechanical properties and failure modes of the soil in the collapsing region. The near-sight measurement technique is now used for the unconstrained resistance. The lateral deformation of the soil samples in the pressure test was sampled and the image information was digitized using matlab. The deformation of the soil with different mechanical properties was analyzed by the displacement information of the marked points and the overall contour deformation and other information. Results showed that in the unconfined compressive strength test, there was no significant difference in the overall deformation of the different soil samples. In one sample, there were significant differences in the displacement of different markers. The close-range photogrammetry technique can well compensate for the lack of the unconfined compression test and it also has a broad space for development in the field of soil and water conservation.
Numerical simulation of ground penetrating radar based on advanced prediction of adverse geological bodies
Authors: Li Shaojie , Hu Rongming
Published: December 2019

The geological conditions of the unfavorable geological bodies and the monitoring environment are characterized by diversity and complexity. It is still very difficult to use ground penetrating radar(GPR) to detect and interpret later. In this paper, the finite-difference time-domain method is used to simulate the propagation process of electromagnetic wave of GPR in the models of water-filled, mud-filled and fractured zones formed by cavities, faults and faults, and the response characteristics of electromagnetic wave under different conditions are analyzed. The results show that the simulation results coincide with the model design data, which proves that the numerical simulation results can provide a reference for the graphic interpretation of the actual exploration results. The A-Scan diagram shows that when the electromagnetic wave enters the medium with large dielectric constant from the medium with small dielectric constant, the phase of the wave will change, and the greater the difference of relative dielectric constant is, the stronger the radar reflection signal will be. At the same time, the model results show that the energy of electromagnetic wave will decay sharply under water-bearing conditions, and multiple waves will be formed below, which can provide a reference for ground penetrating radar in the actual detection of water-bearing cracks.
Architectural Acoustic Application of Medical Space Roof Wall System Based on Prefabricated Interior Decoration Technology
Authors: Li Xiuyun
Published: December 2019

The roof wall system building components carry the functions of sound absorption, fire prevention, decoration, environmental protection and comfort, which can well solve the problems of medical space efficiency, quality and benefit. Based on the development trend of the assembled interior technology, the green and precast glass fiber reinforced gypsum components and inorganic high-strength sound absorbing board are selected as the engineering practice decoration materials for the integrated ceiling and wall of multiple spaces in the hospital. The application status of boards in architectural acoustics is introduced, along with the application status of assembled type medical space roof system, which provides practical experience of the fabricated interior technology.
Dynamic response analysis of submarine tunnel under different wave loads
Authors: Ouyang Zhiyong , Li Peijie , Luo Ruofan , Feng Zhuojun
Published: December 2019

Based on theory of Biot’s dynamic consolidation and the elastic dynamics, this paper considers seabed soil and the contact effect of the tunnel, the seabed soil along the depth direction variability and viscoelastic boundary. The two-dimensional finite element model is established to compare the wave force acting on the seabed surface, which causes the internal stress of the tunnel and its dynamic response of the seabed in the first-order elliptic linear wave, cosine wave and the second order stokes wave. Results show that when the relative water depth is larger, the first-order elliptical cosine wave theory used to calculate the dynamic response of the seabed-tunnel will underestimate the seabed soil liquefaction resistance and tunnel resistance to deformation ability. And when the relative water depth is smaller, the linear wave theory to solve the dynamic response of the seabed-tunnel will overestimate the seabed soil liquefaction resistance and the ability to resist deformation of the tunnel. With the increase of L/d and T wave parameter, the first-order elliptical cosine wave and the degree of nonlinear second order stokes wave are in increase. Compared with the linear wave, the seabed soil around the tunnel of pore water pressure, displacement and the internal stress amplitude of the tunnel are obviously increasing.
Analysis of Friction-Slip Characteristics of Pot Bearings in Continuous Curved Girder Bridges
Authors: Han-zheng Xu , Xiao-tao Li , Qing Liu , Hong Pan
Published: December 2019

In order to study the influence of friction and slip effect of bearing on transverse deviation of concrete curved beam bridge, the solid model of basin rubber bearing was established by ANSYS. Based on this, the stress and deformation of PTFE plate, basin ring, compressed rubber block and base plate were analyzed in detail; the vertical of the bearing was simulated by finite element method. The load-displacement curves are compared with the bearing capacity test results of 2.5MN basin rubber bearing completed by the Highway Science Research Institute of the Ministry of Transportation. The results show that the basin rubber bearing has stable mechanical properties, and the maximum principal stress, vertical compression deformation and radial deformation of the bearing under the design vertical load satisfy the design requirements; the maximum error between the calculated value and the experimental value of the vertical compression deformation is 4.8%, which verifies the accuracy of the finite element model and is for the follow-up. Foundation for analysis of friction and slip characteristics of traveling bearings.
A new algorithm of dangerous points accurately identification on mechanical structure under dynamic loads
Authors: Zhang Yan-gang
Published: December 2019

Identification of dangerous moment of mechanical structure is a key process for dynamic response optimization. The dangerous moment of identification method for solution space of dynamic response based spectral element was proposed according to the insufficient of traditional method, which was difficult to accurately determine structure dangerous moment. The solution space of structure dynamic response was obtained by using the modal superposition method. The matrices of time points and their corresponding solution space values of dynamic stress were constructed. The Lagrange interpolation method was applied in the solution space domain to getting dynamic response function of high precision. Finally, the most dangerous moment of structure under dynamic loads was found by executing the global optimizer, though constructing a mathematical model to identify dangerous moment. The theoretical research results were applied to engine piston with dynamic loads to verify, and results showed that dynamic stress and dynamic displacement was not simultaneously reach extreme moment of the dynamic load, due to the nonlinear relationship between stress-strain and strain-displacement of structural. The existence of a time gap between them leads to dynamic optimization design is inaccurate. Dynamic optimization design should also consider two dangerous moments in order to avoid structure inaccurate design. This paper is the foundation of dynamic response optimization of piston.
Research and Application of Over-filling Monitoring Technology for Underwater Cast-in-place Piles
Authors: Wei Yongbin , Cao Zhen
Published: December 2019

The quality of the pile head is the construction controlling difficulty of the concrete cast-in-place pile technology when the bored piles, especially the deep foundation piles, are filled with underwater concrete. The hammer method and volume estimation method are widely used to control concrete over filling in the prior technology. However, in the actual operation, these two methods are inclined to cause misjudgment by the field technicians, so it is difficult to accurately determine the height of the concrete, resulting in the under or over height of the pile head, which seriously affect the construction quality and greatly increase engineering costs in construction sites. In order to solve this problem, based on the principle that the mud density of the bored pile and the concrete density are different, and the pressure difference is generated at a certain depth, in this paper a liquid pressure sensor, da-ta acquisition module, wireless communication module, remote network server and monitoring terminal were used to develop an overfilling control-ling device for underwater concrete bored piles. Several engineering field tests were carried out and the test results showed that the device could accurately monitor the timing when concrete reaches the designed pile top elevation position and the specific quantitative height in the underwater pouring process, and can alarm after exceeding the limit as while. The method is simple and practical, and has high promotion value.
Analysis of Ultimate Bearing Capacity of Large Span Continuous Rigid Frame Curved Bridge
Authors: Yang Xiaochong , Xu Hanzheng
Published: December 2019

In order to study the ultimate bearing capacity of the large span continuous rigid frame curved bridge, a three-dimensional solid finite element model of a curved bridge was established based on ANSYS software. Different load cases were considered in analysing the ultimate bearing capacity. The results show that the loading process of the selected background curved bridge can be divided into elastic, elastoplastic and failure stages. Besides, under the most unfavourable load case, the living load coefficient and the safety factor is are 20.40 and 2.94, respectively. This indicates that the calculation formula of ultimate bearing capacity provided by the current standard has enough safety degree. In addition, because of the coupling effect of bending and torsion, the tensile stress and compressive stress on the outside of girder are larger than those on the inner part. Moreover, the ultimate bearing capacity of vehicle eccentric loading is lower than that of medium load, which should be considered in the design.
Research on Design Index for Continuous Uphill Gentle Slope of Expressway in Mountainous Area
Authors: Pan Binghong , Kong Bingjie
Published: December 2019

On the basis of analyzing the measured data of the uphill slope and establishing the relationship model between the decrease of truck operation speed and the traffic accident rate, put forward admissible speed reduction standard. According to the distribution of truck load truckload tonnage and power weight power-weight ratio, select the researching dominant vehicle comprehensively. The design index of uphill gentle slope is obtained based on recovering the operation speed of trucks and considering the climbing performance curve of the leading vehicle on the uphill gentle slope section. The research results can provide a reference for the design of uphill gentle slope of expressway in mountainous area.
Test and Design Method for the Performance of Anchor Nodes between an Underreamed Anti-floating Anchor and the Bottom Structure
Authors: Guo Gang , Yang Daopeng , Zhong Guang , Liu Zhong , Xue Zizhou
Published: December 2019

The number of applications of underreamed anchors with high bearing capacities rapidly increases with the increase in building volume. Scholars and engineers worldwide have reported their researches on the bearing mechanisms and failure modes of underreamed anchors. However, the high capacity of anchors generates new problems for building structures, including the key design point of the anchor node between the high-capacity anchor and the structure in anti-floating engineering. Currently, there is no relevant research report or technical standard. To address this issue, a series of full-scale tests on steel anchor plates are conducted in Nanjing, China. Through these tests, a regular set of test results is obtained. Based on the obtained results, a calculation method for the bearing capacity of the anchor plate is derived, and a complete design method for the anchor node is presented. Furthermore, waterproofing and anti-corrosive construction methods for the anchor node are discussed to perfect the design work of the anchor node.
Numerical analysis study on seismic behavior of resilient high strength concrete columns reinforced by ultra-high-strength bars
Authors: Shao Jiabang , Zhao Shichun , Sun Yuping
Published: December 2019

To make concrete columns with drift-hardening behavior and small residual deformation, a simple method is proposed. The method is the use of ultra-high-strength (UHS) PC wire strands as longitudinal reinforcements of concrete columns. The effectiveness of the method has been verified by experiments. The purpose of this paper is to present an analytical method for simulating seismic behavior of resilient high-strength concrete columns reinforced by PC strands, based on reliable constitutive laws of the PC strands and the concrete. Five square concrete columns with the cross-section of 250mm × 250mm, the height of 1000 mm, the shear span ratio of 2.0, the axial load ratio of 0.25 and compressive cubic strength of 95 MPa were fabricated and tested. The experimental results were compared with the results predicted by the analytical method. Comparisons indicate that the proposed method can predict the development trend and feature points of the envelop curve of the columns until large deformation. Comparisons also indicate that the calculated flexural capacities by the proposed method show very good agreement with the test results. Utilizing the proposed method and the current design code, which are used to evaluate the ultimate flexure and shear capacities, respectively, can give a reasonable evaluation of the failure mode of concrete columns.
Stress analysis of arch foot of tie arch bridge based on spatial multi-scale model
Authors: Wang Qi , Li Tao , Wang Tao , Mao Wangtao
Published: December 2019

For the arch foot connection structure of a steel box tied arch bridge in Guizhou Province, the spatial multi-scale finite element model is established by substructure method, and the influence line is loaded. The calculation results show that under the action of “dead load + live load”, the overall stress of arch foot is reasonable and the stress distribution is uniform, but the bearing roof, side web of arch foot and tied rod roof are complicated and the stress concentration is obvious. In the process of operation and maintenance, in order to ensure the safe use of bridges, we should focus on the observation of such components.
Research on Arterial Highway Traffic Safety Risk Assessment Method
Authors: Zhao Yifei , Xiao Shan , Wan Hang
Published: December 2019

Currently, research on arterial highway traffic safety risk assessment and control techniques are limited. Back Propagation (BP) Neural Network, fuzzy logic algorithm, Principal Component Analysis (PCA) and Analytic Hierarchy Process (AHP) are the common used methods in the existing studies. These methods take into account all the risk factors without effective selection. This may lead to complicated computation and procedures and poor time effectiveness, which would hinder the wide spread and application of safety risk assessment among design engineers and operators as well as in different levels of roads. The outcome of the study makes the significant contribution to accident hazardous locations treatment measures. Therefore, based on historical traffic accident data, this proposed an applicable, ease of implementation and simplified road risk assessment method which can effectively assess hazardous locations. The paper collected the historical data of an arterial highway to verify the proposed method. The results match the actual road safety situation.
A multi-scale and multi-medium numerical model of a multi-fractured horizontal well in tight oil reservoir of daqing oil field
Authors: Fan Yang , Qiquan Ran , Jiaxin Dong , Guanzhong Shen , Yijing Feng , Junlong Zhao , Mengya Xu , Lifeng Liu , Suqi Huang
Published: December 2019

The macroscopic geological conditions and microscopic pore characteristics of tight oil reservoirs are always complex. A multi-medium and multi-scale numerical model which can best embody tight oil reservoir features for a multi–fractured horizontal well (MFHW) is hard to establish. Without a reasonable numerical model, the evaluation and adjustment of a MFHW in a tight oil reservoir are difficult to fulfil. Based on the experiment results, geological data and construction parameters of the Pu34 well area, this paper establishes a multi-scale and multi-medium numerical model of a MFHW, Well X, in Daqing Oil Field and simulates the development effect of Well X after refracturing measurement. The results show that three types of reservoirs and four kinds of pore media exist in the Pu 34 area. The history match shows the numerical model works well. By using this numerical model, the Well X, after re-fracturing, would perform better than without re-fracturing in the early stage of production period, and it also increases the cumulative oil production by 223t after production of 10 years. In economy regard, it has faster oil recovery rate which is helpful for company to recover the investment cost of this well.
Update evaluation of garbage classification and recycling equipment based on analytic hierarchy process
Authors: Wu Siqi , Zhang Yaosheng , Wang Xue , Zhang Yuehua , Sun Yanbin , Wang Changbao
Published: December 2019

So as to achieve the reduction of urban household waste, resources and harmless, improve the level of urban development. Through analytic hierarchy process (AHP), the update of garbage classification and recycling equipment can be analyzed intuitively and quantitatively. The analytic hierarchy process (AHP) model was established to obtain the parameter proportion of the factors affecting the renewal of garbage classification and recycling equipment. So as to select the best scheme and make the resources play the biggest role.
Natural Ventilation Performance Simulation and Analysis of New Type Sound Insulation Window
Authors: Fayuan Wu , Ping Liu , Xiaolei Liu , Xiaomin Dai , Yuangen Zhang
Published: December 2019

To evaluate the ventilation performance of new type sound insulation window, a window model with streamline-structure micro-perforated panel absorber (MPA) was simulated based on computational fluid dynamics (CFD). Finite element model of the insulation window was built to analyze the flow field in muffler channel, velocity in vent and pressure loss of the channel. To contrast with the simulation model, an insulation window artifact was produced and tested in ventilation quantity detection. The results show that the dominant pressure loss is local hydraulic loss that comes from MPA structure. The total pressure loss increased by 4.3 Pa under 0.5 m/s inlet wind velocity. The difference of pressure loss between simulation and actual test is 6.3%. CFD simulation is an effective and low-cost method to evaluate the ventilation performance with visual results. The results provide valuable reference for optimal design of insulation window.
Research progress of urban green space systems evaluation in China
Authors: Zhang Chunxiao , Yue Bo , Wang Yafei , Xie Rui , Shen Guangzhe
Published: December 2019

Since the founding of the People’s Republic of China 70 years ago, the theory of urban green space system planning have been evolving along with the urbanization process. At the same time, it also draws nutrients from the planning thoughts of western developed countries. Under the background of ecological civilization construction, urban green space is more affected by the attention of the government and the public, urban green space system planning is the overall distribution of green space resources, reasonable construction of the important means of urban ecological environment, but the study of urban green space system planning evaluation has not yet been thoroughly. Urban green space system planning in China based on the development process and the landscape architecture of self-perfection for context, from the connotation of urban green space system planning evaluation, three aspects of theory and practice, combing summing up China’s urban green space system planning evaluation.
Regional Difference Survey of Wastewater Treatment Methods in Highway Service Areas of China
Authors: Ni Dong , Li Gang , Han Gensheng , Deng Zhigang , Shao Shegang
Published: December 2019

This thesis, based on questionnaire survey, field investigation, sewage sample test etc., studies the relationship between water consumption and discharging volume, type and process of sewage treatment facilities, and statistical analysis of sewage discharge whereabouts in highway service areas. There are 35.5% and 27.6% respectively in the service areas of north and south China without sewage treatment facilities installed or operated. The great difference between the highway service areas of north and south China lies on the differences in geographical location, climate and level of economic development. The problem of nearby discharging of sewage and sludge in the service areas, lower recycle rate, unused or damaged sewage treatment equipment seems to be prevalent. On the whole, quite a few sewage treatment facilities and processes in service areas are not capable of managing the sewage in service areas, which has great potential for improvement.
New Solution To Apply Constructed Wetland Technology In Cold Climate
Authors: Liang Meng-Yuan , Han Yan-Cheng
Published: December 2019

Due to the influence of low temperature in winter, the removal effect of pollutants in constructed wetlands in winter is greatly reduced. In order to improve the removal effect of wetland on pollutants such as nitrogen and phosphorus, this paper proposes a new insulation method that uses the residual heat of bathroom bath waste water to supply heat to the constructed wetland. In the proposed new wetland system, the average removal rates of TN, TP and NH4
+-N in wetlands reached 61.09%, 85.03% and 33.85%, respectively. The application of residual heat energy to the construction of constructed wetland can realize the recovery and utilization of energy, which is conducive to the promotion and application of constructed wetland in the cold regions of the north.

A post-publication change was made to this article on 29 May 2020 to correct an author name on the webpage.
Investigating the Influencing Factors of Carbon Dioxide Emissions from Residents’ Energy Consumption in China
Authors: Wang Jingmin , Chen Keke , Song Xiaojing
Published: December 2019

With the rapid development of the social economy and the accelerated process of urbanization, the consumption level of residents, especially the demand of energy consumption has increased greatly, which will become an important reason for the growth of carbon dioxide emissions in the future. China has concentrated on policies and measures for energy conservation and emission reduction in the industrial and industrial sectors, ignoring the issue of carbon emissions in the residents’ consumption for a long time. This paper calculates the carbon dioxide emissions of residents’ energy consumption for 1991-2017 based on thirteen kinds of energy consumption. Then constructing the STIRPAT model to divide the influence factors into 5 factors: population, urbanization rate, GDP per capita, energy structure and energy intensity. This paper constructed the cointegration equation and the VEC model through the unit root test, Johansen cointegration test and Grainger causality test by Eviews8 software. Finally, this paper purposed the measures of reducing the carbon dioxide emissions of residents’ energy consumption by reducing the carbon dioxide emissions per capita and adjusting the energy structure.
The Strategy of Integrated Demand Response Considering the Interaction Between Superior Power Grids and Factories
Authors: Zhang Yuhong , Luo Yi , Deng Yingying , Wang Xiao , Lian Libo
Published: December 2019

With the development of the energy internet, the integrated demand response (IDR) has become a key technology for the establishment of a benign interaction between industrial parks and factories. As a result, a comprehensive demand response strategy is proposed in this paper. Firstly, taking minimization of cost, optimal scheduling model for factory is constructed, as the basis for interaction. Then, the maximum adjustable ability of the user is excavated according to the peak regulation of the park based on the IDR model. The results show that the energy utilization efficiency of the users is improved by the synergistic complementarity, and the industrial park can provide the auxiliary services for the power grid.
Application of Data Analysis and Interpolation Method of Safety Monitoring System in a Water Conservancy Project
Authors: Zhen Shufeng , Wang Jianguo , Wang Qi
Published: December 2019

Dam safety monitoring data analysis and project operation management should keep pace with the development of monitoring technology. Taking the application of DSIMS4.0 system developed by Nan Jing Nan Rui Group Co. ltd. in Xinjiang water conservancy project as an example, this paper highly summarizes the scientific support of the system for dam operation performance analysis and effective management of dam.
Mesoscale simulation of pool boiling on a cylinder heater under controlled wall temperature
Authors: Wang Haoyuan , Lou Qin , Li Ling
Published: December 2019

In this study, a phase–change LB model was adopted to simulate the pool boiling on a cylinder. The simulation results showed that the phase-change phenomenon occurred firstly at the top of the cylinder and produced the bubble at a low heating temperature on hydrophilic surface. With the increase of heating temperature, new nucleation sites appeared on both sides of the cylinder. And under the action of buoyancy, the bubbles on both sides risen to the top and merged and then departed. When the heating temperature reached a certain level, a bubble appeared at the bottom of the cylinder and grown steadily. Eventually, the bottom bubble would wrap the cylinder completely so the cylinder entered the film boiling. For hydrophilic surface, the temperature and heat flux over the cylinder surface would vary with the formation of bubble which was similar with flat heater. And we conducted the boiling curve (from the natural convection to the film boiling) on the cylinder by the numerical simulation.
A neural network prediction of eutrophication index of mainstream discharged tributary flow in a rainstorm
Authors: Liu Lei , You Xue-yi
Published: December 2019

Rivers are the major inland water resources for the survival and health of human and ecosystem. Nonetheless, the water quality of rivers in many places is deteriorating or even eutrophic. As a major external pollution, rainfall runoff has attracted more and more attention. In order to timely know the eutrophication status of mainstream considering tributary flow discharge in a rainstorm period, a neural network prediction method is proposed. The inlet flow of mainstream and rainfall reappearing period are the input variables. The eutrophication index of mainstream control section is the output variable. It’s obtained based on Environmental Fluid Dynamics Code simulation and the universal index formula for eutrophic evaluation using a logarithmic power function. They form the training and testing samples. Then, the back propagation neural network is optimized and well-trained back propagation neural network is obtained. Ten cases are randomly selected and predicted. The results show that the relative error of the predicted eutrophication index is less than 1.5%. It’s demonstrated that this method can timely and accurately predict the eutrophication status of the mainstream in a rainstorm period. It will be helpful for decision makers.
Screening Tests of Copper Mine Tailings Flocculation with Polyacrylamide
Authors: Peng Yunyan , Jin Dong
Published: December 2019

The flocculation method had a good effect in treating copper tailings, and polyacrylamide (PAM) was commonly used as an effective flocculant. In this paper, a complete set of screening tests was established to effectively evaluate the flocculation performance of PAM used for copper tailings treatment. Firstly, the traditional jar tests were applied and the anionic PAM performed better for flocculation treatment of copper tailings than cationic and nonionic PAM. However, this method could not be further applied to screen anionic polyacrylamide with different molecular weights and hydrolysis degrees because of unobvious difference in settling curves of them. Therefore, the dynamic test rig was self-designed for further screening. Furthermore, the orthogonal design scheme of five factors and three levels was carried out for experimental design and results evaluation. The optimal conditions selected from dynamic rig tests were applied to the plant trial, and the treatment effect can meet the requirements after fine-tuning based on the plant operating conditions.
Optimization of extraction method for extracellular polymeric substances of Phanerochaete chrysosporium
Authors: Liu Jie , Wu Lei , Li Ningjie , Chen Zhongwei , Lan Qi
Published: December 2019

There are many methods for extracting extracellular polymeric substances of white rot fungi. In this experiment, we studied the efficiency of NaOH method, EDTA-2Na method and high-speed centrifugation method. Without destroying the cell structure and the activity of extracellular polymeric substances, we maximized the effect of extracellular polymeric substances. The results showed that in the ultrasonic centrifugation method, the polysaccharide concentration in the extracted EPS solution gradually increased with the increase of the ultrasonic action time. The concentration of polysaccharide in the EPS solution extracted under the ultrasonic action for 10 min and 12000 rpm was the highest (613.638 mg/L); on the whole, the ultrasonic treatment time has a greater impact on the extraction efficiency of polysaccharides in the extracellular polymer of Phanerochaete chrysosporium, and the polysaccharide concentration changes greatly. This study can provide useful information for the follow-up experiments related to extracellular polymeric substances of white rot fungi.
Study on the Water Sensitivity Analysis of Red Clay Shear Strength Based on Culon-morper Rule
Authors: Li Lifeng , Chen Changlu , Zhang Xiaohu , Deng Duilin , Han Liuping
Published: December 2019

In this paper, the changing law of the peak and residual cohesive force and internal friction angle for undisturbed soil from three different sampling sites in Bijie area were obtained through the indoor experiment. In the case of natural undisturbed water content, the peak and residual cohesive force decrease with the exponential relationship of water content, while the peak and residual internal friction Angle decrease linearly with the water content range. Based on the traditional Culon-morper shear strength criterion the changes of peak and residual shear strength with water content were obtained. The research in this paper is helpful to understand the change of shear strength with water content in Bijie area and to guide engineering practice.
Cytotoxicity and Mechanical Properties of New Mg-Zn-Y-Nd-Ca Biodegradable Magnesium Alloys
Authors: Dai Yuelai , Zhang Jiang
Published: December 2019

The new Mg-Zn-Y-Nd-Ca magnesium alloys are used as the research object, and its components are designed to evaluate the cytotoxicity of magnesium alloys with different component elements. The cytotoxicity test of fibroblast L-929 and osteoblasts MC3T3-E1 indicates that Mg-Zn-Y-Nd-Ca, as a biodegradable material, can meet the needs of cytotoxicity and promote the proliferation of osteoblasts MC3T3-E1. The mechanical properties test shows that the new magnesium alloys have good mechanical property, tensile strength is about 290Mpa and elongation can reach 15%.
Research on Energy Internet Market Trading System
Authors: Li Zhu , Pang Bo , Zhao Jing , Liu Dunnan , Li Genzhu
Published: December 2019

At present, the level of energy development and utilization continues to increase, but it is still difficult to meet the growing energy demand. Because different types of energy consume a lot, and there are some barriers between different energy markets. The construction of energy Internet market can strengthen the incentive role of market competition mechanism, make the market regulation ability play a greater role, and make the energy distribution more reasonable and efficient. Therefore, this paper constructs the energy Internet market trading system from the aspects of energy Internet market subject, market object, market structure and trading mode. It aims to provide a theoretical basis for the construction of the energy Internet market.