bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on mechanical properties of the gravelly soils with consolidated-undrained conditions
Authors: Luo Fei , Wei Song , Xu Zihan , Jing Li 
Published: December 2019

Abstract
A standard stress path triaxial test system (STDTTS) was applied to study the mechanical properties of gravelly soil at initial relative densities of 0.13,0.5K 0.67 and 0.81 under confining pressures of 50,100,200 and 400 KPa, respectively. The results in the consolidated undrained tests show that all stress-strain curves behalf strain softening. With an increase of confining pressures, the pore pressure increases gradually and is almost irrelevant to initial relative density. With the increase of initial relative density, the peak strength of tested samples shows an uptrend, and its strength conforms to the Mohr-Coulomb strength criterion.
Prediction of ground settlement on shielded water-rich sand layer considering groundwater level and tunnel depth
Authors: Bo Wu , Jie Xu , Wei Huang , Zhigang Li 
Published: December 2019

Abstract
In order to research the effect of different groundwater level and tunnel depth on the ground settlement law for the shield construction of the water-rich sand layer, monitoring data of Fuzhou Metro Line 6 project is adopted and analyzed. The finite element software Plaxis 3D is used to carry out the numerical simulation of the project. Using the “activate” and “deactivate” functions of Plaxis 3D finite element software, the jack thrust, grouting pressure, face pressure, shield machine advancement and splicing of the segment are simulated. The calculation results in terms of vertical displacement of ground surface are in good agreement with the actual monitoring data. Using this numerical simulation method, under the combined action of different groundwater level and different tunnel depth, the ground settlement law of shield in the water-rich sand layer is studied, and the following conclusions are drawn: the shallower the groundwater level in the same tunnel burial depth The greater the surface settlement, the greater the buried depth of the tunnel and the smaller the surface settlement.
Dead-time Compensation Method Based on Field Oriented Control Strategy
Authors: Miao Zichao , Wei Jiangfeng , Guo Tingting , Zheng Mingyue 
Published: December 2019

Abstract
This paper analyzed a dead-time effect and zero-current clamping phenomenon in FOC control strategy, and then proposed corresponding compensation measures. The Field Oriented Control (FOC) strategy of brushless motor is improved according to this Dead-time Compensation measure. On the basis of the existing FOC control theory, a dead-time hysteresis loop is added near the current zero-crossing point to prevent current fluctuation and zero-point clamping from causing errors. The dead-time compensation is carried out in each PWM cycle according to the principle that the actual volt-second area is equal. Finally, the feasibility of the method was verified by experiments, the results showed that the compensation method effectively improves the current waveform and improves the stability of the motor operation, and it proved to be of good use value.
Study on deformation law of slope foundation under different external loads
Authors: Wang Yuan 
Published: December 2019

Abstract
The external load has a great influence on the stability of the transmission tower foundation. Considering that the external load on the foundation is more complicated, the external load is simplified to the basic center. The analysis of the deformation law under the external load is helpful to grasp the dangerous part of the foundation after being subjected to external force. In order to highlight the variability in the direction of the external load, the external load is set to a certain size, and the load direction is regularly changed. Using the finite element difference software FLAC3D to analyze the internal deformation law of the model under nine working conditions. The results show that the deformation of the foundation in the horizontal and vertical directions will change regularly with the direction of the concentrated force. When the direction of the concentrated force is within a certain range, it will play a positive role in the stability of the foundation.
Research on pavement quality control based on bayes’ theorem
Authors: Bei LIU , Tongxing CAI , Sheng XIAO , Hang YUAN , Qiang Wang 
Published: December 2019

Abstract
In order to meet the fine construction requirements of municipal engineering, improve the pavement stone paving technology level. Through the statistics of municipal engineering sidewalk construction common technical quality problems. Established the pavement surfacing technology quality control index system, and establish the quality control of causal relationship between spatial topology relationship structure model, using the mature of bayes’ theorem to the pavement stone pavement quality control study, forecast the quality of each control factor to influence the quality of the pavement stone pavement, the size of the causal backstepping method is used to analyze mechanism of quality control factor, finally, complete quality control evaluation by mutual information theory, find out the biggest quality control factor. Taking the project of yanjiang avenue (minsheng road to qingchuan bridge) in wuhan as an example, this paper applies bayes’ theorem and mutual information theory to the research of municipal pavement quality control. The results show that the probability of stone pavement quality accidents in this project is 2.83%, the roadbed quality control is not in place is the largest quality control factor affecting the fine construction of this project.
Dynamic Control Method of Thermal Power Units Compensating for Wind Power Disturbance
Authors: Li Jun , Wang Ting , Meng XiangRong , Li Jie , Gao Song , Lin Bo 
Published: December 2019

Abstract
The randomness and volatility of wind power generation are the main reasons restricting the capacity of power grid to absorb wind power. Thermal power units are the main force of power grid frequency modulation. The speed of load adjustment rate determines their response ability to power grid load. Based on the analysis of the characteristics of wind power generation, the nonlinear multiscale decomposition of the automatic power generation control (AGC) load command is carried out. Combined with the different load regulation rates of different types of units, the rational allocation of unit combinations can effectively ensure the power grid load regulation capacity and compensate the random disturbance of wind power.
Composition and Reproduction of Regional Landscape Elements of Highway
Authors: Huang Wenhong , Shao Shegang , Wang Jian , Yuan Minmin 
Published: December 2019

Abstract
In recent years, with the enhancement of people’s awareness of ecological environmental protection and aesthetic ability, as well as the requirement of sustainable development, the coordination between highway and landscape has gradually attracted people’s attention. How to reduce the damage of highway construction to the original landscape and create a harmonious road environment, and how to make highway construction not only meet people’s travel needs, but also coordinate with the surrounding environment, are new problems faced by highway construction. By sorting out the inheritance paths, this paper classifies the highway landscape, pays attention to the protection and grasps its essence, so as to protect the regional context and characteristics on the basis of combining the innovation of the times in the planning and construction of the highway landscape.
Auto-encoder based fault early warning model for primary fan of power plant
Authors: Lu Kuan , Gao Song , Sun Wenxue , Jiang Zhe , Meng Xiangrong , Zhai Yong , Han Yingkun , Sun Mengmeng 
Published: December 2019

Abstract
Primary fan system plays an important role in the operation of a power plant. However, due to the complicated working conditions of the primary fan and the strong coupling characteristics of multi-state variables, it is necessary to carry out feature engineering before using multivariate state estimation technique (MSET). In addition, no-linear operator should be designed to make sure matrix being invertible. This paper proposes an Auto-encoder based model to automatically construct a normal state memory matrix through unsupervised learning of neural networks. It reduces human intervention as well as the difficulty in giving a suitable non-linear operator design. This model is applied to the early warning of primary fan failure in a power plant in eastern Shandong Province.
Development and Application of Universal Hanging line Fixtures for 66-220kV Pointed cross-head
Authors: Jun Ma , Yonggang Shi , Gang Dong , Fuxing Gong , Kegang Wei , Xin Su , Yu Ding , Zhu Wang 
Published: December 2019

Abstract
For traditional fixtures, replace insulator string conductors as horizontal side hanging points in the linear pole tower of the transmission line. Its versatility is not strong, when using the wire rod and soft slings or carriages can not be shared and other limitations. The development of a Universal Hanging line Fixtures for 66-220kV Pointed cross-head is proposed. First of all, the fixtures span can be adjusted by adjusting the bolts, so as to better avoid all kinds of cross-burden head bolts, and cross on the joint plate and the cross-load bolt. Makes it stable. Secondly, fitting the wire rod directly in the slot at the hanging points at both ends of the mount and lifting with a wire rod depends on the needs of the lifting wire. You can also install a pin rod in the trailer, the carriage set or tight-line soft sling hanging on the pin rod, with the carriage or soft sling lifting. Solved the problem when replacing the insulator with pointed cross-heads, the generality of the wire lifting is not good. And the wire rod and carriage set and soft sling between the lifting tool interchange.
Application of Dry-coupling Ultrasonic Technology in Oil-level Detection of Oil-filled Equipment in Power Grid
Authors: Qinqin Liang , Chaofu Lin , Longfei Zhang 
Published: December 2019

Abstract
Dry-coupling ultrasonic technology is applied to detecting oil-level of oil-filled equipment in power grid. Vinyl silicone rubber is used to substitute liquid coupling agent to fabricate dry-coupling ultrasonic probe, which makes the ultrasonic directly enter the oil-filled equipment through the special structure of dry-coupling probe and detect oil-level of oil-filled equipment accurately and rapidly. Omitting the step that smearing liquid coupling agent on the probe can avoid the contamination on the surface of equipment and significantly improve the detection efficiency.
Research on the Relationship between Structural Change and Economic Growth in Guangzhou——An Empirical Analysis Based on VAR Model
Authors: Zhong Jiayi , Tang Jie , Zhong Jiayi 
Published: December 2019

Abstract
High-quality development is an active choice for socialism with Chinese characteristics to enter a new era. As one of the four first-tier cities, Guangzhou should set an example in promoting high-quality economic development. Based on the structural factors of economic development, this paper uses vector autoregressive model (VAR) to empirically analyze the dynamic relationship between consumption structure, industrial structure, ownership structure change and economic growth in Guangzhou from 1985 to 2017. The results show that there is a two-way Granger causality between Guangzhou’s consumption structure, industrial structure, ownership structure and economic growth. The two-way causal relationship between industrial structure change and economic growth is the most significant. From the results of variance decomposition, the consumption structure changes have the highest contribution to the trend of economic growth fluctuations.
Effect of acid wet deposition on operation of power grid equipment in China
Authors: Chao Yafeng , Zhang Liu , Huang Fuyong , Wang Cheng , Yue Yishi , Duan Jianjia , Liu Sanwei 
Published: December 2019

Abstract
The distribution law of acid rain in China is counted, and the operation of power grid equipment in acid wet deposition area is investigated. It is found that southern China has the strongest acidity of precipitation in the country. The ratio of SO4
2-, N03
-, NH4+, Ca2+ concentration in acid rain is higher. Acid rain causes serious corrosion of transmission line and transformation equipment in Shandong, Sichuan, Shanxi and Henan provinces of China. The acid rain and corrosion products aggravate the dissolution and chemical reaction of the original dry deposition pollution on the external insulation surface of power grid, which may lead to corrosive flashover.
Analysis and countermeasures of the tilt of lightning rod in transformer substation
Authors: Li Wenbo , Liu Lanlan , Sun Lipeng , Hu Jiarui , Wang Jun , Xie Yi 
Published: December 2019

Abstract
The lightning rod is an important lightning protection facility in transformer substations, which has a good protective effect for the compact equipment, while its safety performance is often neglected. The lightning rod in the 220kV transformer substation is up to tens of meters, the collapse of the lightning rod results in not only serious damage to the equipment, but also severe power failure. In this paper, the causes of the tilt of the lightning rod were analysed, and the installation requirements for the new lightning rod was proposed, which could effectively ensure the safety of the lightning rod.
Multi-factor Comprehensive Evaluation on Durability of Various Grouting Materials
Authors: Xia Junwu , Wang Tonglei , Yang Yuanzheng , Linli Yu 
Published: December 2019

Abstract
With In this paper, four grouting materials, namely new type grouting material, pure cement, cement-sodium silicate and glue sand, were tested by single factor for their water corrosion resistance, permeability resistance and volume stability. The durability of the four grouting materials under the environment of three factors was evaluated by the multi-factor fuzzy comprehensive evaluation method. The results show that the three kinds of new type grouting materials are better than the other three kinds of grouting materials in terms of anti-water corrosion and volume stability. In terms of impermeability, the performance of cement reached the best impermeability pressure of 0.8Mpa, but the impermeability pressure of new type grouting material with a water-cement ratio of 1.0 has also reached 0.6MPa, which can meet the impermeability requirement with a small gap with cement. As a scientific and effective evaluation method, the method will be helpful to the further study of the durability of grouting materials.
Extension of bridge cap beams with CFRP composites: experimental investigation
Authors: Tan Cheng , Xu Jia , Aboutaha Riyad 
Published: December 2019

Abstract
As rapid increase of traffic volume, bridge widening has been extensively conducted and studied. Compared to conventional method, such as costructing new bridge piers, extension of cap beam offers a more economical solution for limited amount of bridge widening. This paper presents and experimental investigation of extended pier cap beams reinforced with various Carbon fiber reiforced polymer (CFRP) systems. Four quarter-scaled hammer headed RC cap beams were cast and tested. Failure mode and load-displacement response were evaluated and reported. It was observed that the extened and CFRP reinforced beams exhibited good structural behavior in terms of ultimate strength, stifness and ductility.
Tin Oxide Nanofiber and 3D Sponge Structure by Blow Spinning
Authors: Wang Haolun , Huang Ya , Liao Suiyang , He Hongcai , Wu Hui 
Published: December 2019

Abstract
SnO2 nanofibers show wide applications in many advancing areas, such as gas sensors and semiconductors. The traditional methods of fabricating SnO2 nanofibers include electrospinning, hydrothermal synthesis etc. In this work, SnO2 nanofibers were prepared by blow spinning, which is a convenient and high-efficient method. Meanwhile, a 3D sponge nanofiber network can be produced by accumulating fibers in a novel collector. While traditional SnO2 nanofibers obtained from previous work show high brittleness, the SnO2 nanofiber sponge has good resilience against external compression and can recover to its original shape.
Synthesis and rheological properties of retarding polycarboxylate superplasticizers
Authors: Lai Huazhen , Fang Yunhui , Shao Youzhe , Lai Guangxing 
Published: December 2019

Abstract
In this paper, different types of retarding polycarboxylate superplasticizers (PT-1, PT-2 and PT-3) were synthesized. The structure information and functional groups of the water reducing agent were characterized by gel chromatography and infrared spectroscopy. The rheological properties of the retarding polycarboxylate superplasticizers for cement paste were studied. The results show that PT-1 containing sulfonic group and hydroxyethyl ester has good initial dispersion, while PT-2 containing hydroxyethyl ester and hydroxypropyl ester has long-term slump-retaining effect. The shear stress of PT-1, PT-2 and PT-3 on cement paste increases with the increase of shear rate, while the apparent viscosity decreases rapidly at first and then tends to be stable gradually with the increase of shear rate. The research results are of great guiding significance for the design of different types of retarding polycarboxylate superplasticizers.
Study on the Effect of Water Reducing Agent on Dolomite-based Magnesium Sulfate Cement
Authors: Zhou Jiaqi , Wu Chengyou , Miao Meng , Zong Jinping , Chen Yuanji 
Published: December 2019

Abstract
Adding different types and amounts of water reducing agent to Dolomite-based magnesium sulfate cement (DBMSC), and analysing the effect of water reducing agent on DBMSC by studying its setting time, water reduction effect and mechanical strength. on the one hand, Experimental results show that adding water reducing agent to DBMSC has a retarding effect on dolomitic magnesium sulfate cement, and reduces the hydration heat of cement; on the other hand, the water reduction effect of the water reducing agent on DBMSC prepared by light burning dolomite is not too obvious, and even the mechanical strength of DBMSC is lowered.
Effect of Different Additives Addition on Basic Magnesium Sulfate Cement Composite Sheet
Authors: Miao Meng , Wu Chengyou , Xing Sainan , Zhou Jiaqi , Zong Jingping 
Published: December 2019

Abstract
Study the effects of different admixtures and different dosages on Basic Magnesium Sulfate Cement (BMS) composite sheets, the effects of sodium citrate and phosphoric acid on the flexural strength and compressive strength of basic magnesium sulfate cement sheets were studied, XRD and SEM were used to analyze the composition and microstructure of hydration products. The results show, the addition of admixtures has a great influence on the properties of composite sheets. Adding the corresponding proportion of admixture to the plate, the mechanical properties are significantly improved. Therefore, the properties of sheet metal can be greatly improved by choosing appropriate additives.
Study on Construction Technology of Latex Cement Mortar Pouring Composite Pavement
Authors: Zhong Ke , Sun Mingzhi , Li Yongdong , Wang Xue 
Published: December 2019

Abstract
Pouring composite pavement is one ideal type of pavement structure, but research on the pouring composite pavement is still in its infancy, especially in the construction technology. The normal pavement construction machinery is not compatible with this kind of pavement structure, while the construction efficiency is relatively low, which is not conducive to large-scale construction and affects its popularization and application. Based on the latex cement mortar pouring composite pavement developed by the authors, the pouring composite pavement construction methods of macroporous open-graded asphalt pavement and latex cement mortar are mainly introduced in this paper. According to the characteristics of macroporous open-graded asphalt mixture, the mixing temperature, dry/wet mixing time, paving speed, rolling combination mode and temperature of the mixture were studied, and the key construction process was put forward; For the construction of latex cement mortar, the construction technology of cement mortar production, pouring method and pouring time are mainly studied, and the construction process of cement mortar pouring is put forward.
Research and preparation of waste cement slurry as concrete admixture
Authors: Chen Zhanhua , Lai Guangxing , Fang Yunhui , Zhang Xinfu , Guo Yuanqiang 
Published: December 2019

Abstract
The application of waste cement slurry as concrete admixture was studied. The chemical constituents, the particle size distribution and concrete test of waste cement slurry were investigated. The results show that the addition of a suitable amount of WS-1 will not have a great impact on the strength of concrete, while improving the workability of the concrete. According to the paper, WS-1 can be used as a admixture to adjust the workability of concrete.
Test Study on the Expansion Mechanical Properties of Regenerated Anhydrite Rock
Authors: Li Lei , He Liang , Wang Yao 
Published: December 2019

Abstract
Dihydrate gypsum was formed after the anhydrite was immersed in water, and the volume of rock increased significantly. In order to analyze the expansion mechanical properties of Ordovician anhydrite rock, anhydrite rock samples (regenerated anhydrite rock) were obtained by high temperature drying of anhydrite rock samples, and then the rock expansibility were studied. Experiments show that: (1) Rock expansion curve of regenerated anhydrite shows three typical stages: linear rapid increase stage, concave stage and stable stage, and its maximum value of rock expansibility appears at the end of the second stage. (2) The expansion is closely related to the porosity of rock and the comprehensive performance between rock expansion and dissolution, and the average value of force in group B is 2.5964MPa and C is 1.9693MPa. The test scheme and results can provide references for the study of mechanical behavior of gypsum under dry wet cycling.
Experimental study on the electrical conductivity of SSG composite concrete
Authors: Yan Fengyuan , Li LinJie , Jiang Zhiwei , Ji Yuhang , Feng Lei , He Peiling 
Published: December 2019

Abstract
to study the influence of steel slag, slag and graphite content and age on the electrical conductivity of concrete, the electrical resistivity of concrete specimens with specifications of A(100mm×100mm×100mm) and B(100mm×100mm×400mm) was tested. The results show that: With the increase of curing age and the increase of cement substitution by steel slag: slag, the concrete resistivity continues to increase, and the electrical conductivity continues to decrease; and the optimal blending ratio of steel slag: slag is 1:2, the influence of graphite content on concrete conductivity Larger; as the size of the test piece increases, the electrical resistivity of the concrete decreases.