bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect analysis of vacuum prepressing reinforcement of soft soil foundation
Authors: Liu Wenbin 
Published: December 2019

Abstract
The supercharged vacuum pre-pressure method is to increase the supercharge system on the basis of the direct vacuum pre-pressure, and to increase the pressure in the middle of the vacuum process, thus achieving the goal of saving efficiency and increasing construction costs. Based on the reinforcement project of a blowout foundation in Lianyungang, this paper analyses the process of soil surface subsidence, pour water pressure, stratified subsidence and groundwater level when the soft foundation is reinforced by supercharged vacuum prepressing method by field test method. The paper will provide data support for future actual projects.
Design Method of The New Damping Energy Dissipation Corrugated Steel Plate Shear Wall System
Authors: Duan Wen Xu , Peng Xiao-Tong , Yang Ao , Lin Chen 
Published: December 2019

Abstract
In order to improve the lateral stiffness of the steel frame, natural anti-buckling corrugated steel shear wall was combined with mild steel dampers, forming a new damping energy-dissipation corrugated steel plate shear wall system (DCSW). The design method of the DCSW system was proposed based on plastic analysis. To study the seismic performance of this system, the nonlinear FEM of the DCSW system was established by ABAQUS, and the analysis on bearing capacity and energy dissipation capacity was carried out. The results showed that the DCSW designed by this method had high lateral bearing capacity and energy dissipation capacity. The lateral ultimate bearing capacity increased by 50% and lateral displacement reduced by 43% with corrugated steel plate shear wall and mild steel dampers.
Application of Self-feed-back System in Dewatering-Recharge Engineering of Foundation Pit
Authors: Xiangdong Song , Guojian Miao , Chengsong Qu 
Published: December 2019

Abstract
The self-feed-back system consisted of information acquisition system, information processing system and control system is applied in a complicit dewatering-recharge engineering of foundation pit. This self-feed-back system is made up of wireless monitoring devices and electronic control units. The application of self-feed-back system in Heyan-road-crossing-river-passage shows good serviceability in actual project.
Comparison and Selection of Construction Methods for Shallow and Submerged Large Section Tunnels in Urban Metro
Authors: Bo Wu , Ming Lu , Wei Huang , Jie Xu , Zhongjian Nong 
Published: December 2019

Abstract
Shallow-buried and Deep-Excavated large-section tunnels in Urban Metro have many characteristics, such as large span, complex construction procedures, multiple disturbances to surrounding rocks, and difficult to control ground subsidence. In the process of tunnel construction, the surrounding rock geological conditions and construction procedures have a very important impact on the stability and stress distribution of the tunnel. Based on the South limb project of Xiejiacun entrance and exit section of Tiantongyuan East Station of Beijing Metro Line 17, the applicability of dynamic partition method (DPM) and double-sided pilot excavation method is studied by numerical simulation. The ground subsidence, convergence point deformation, surrounding rock stress, initial support stress and extrusion deformation of palm face are taken as the judgment basis for analysis. The conclusions of this paper are as follows: the surface settlement, vault displacement and surrounding rock stress of DPM method are smaller than those of double-sided guide tunnel method, so it is concluded that DPM method is more suitable for this project; however, the difference of displacement and internal force between DPM method and DPM method is even slight, but when DPM (10) and DPM (15) are used in the construction of right guide tunnel, the internal force and displacement will change abruptly and can be strengthened appropriately. Finally, the deformations of the face during the construction of three construction methods are discussed to verify the feasibility and safety of DPM method, which provides a basis and guidance for the smooth implementation of the project and can be used as a reference for similar projects.
Research on Deformation Control Technology of Broken Soft Rock Pre-mining Roadway
Authors: Hao Wandong , Tao Du 
Published: December 2019

Abstract
This paper takes the right third pre-mining roadway of Double-river Coal Mine as the research object. Based on the analysis of the deformation law of soft rock broken roadway, a composite support technology scheme combining one-time reinforcement support and surrounding rock grouting reinforcement scheme is proposed. The application shows that the deformation of the composite support roadway is significantly lower than that of the conventional support roadway used in the same environment. The deformation of the roadway is effectively controlled, which greatly reduces the amount of repair and maintenance of the roadway, and achieves safe mining of the working face.
Research on the method of quickly comparing the quality of Aluminium Powder for fireworks and firecrackers based on energy dispersive X-ray fluorescence spectrometer (EDXRF)
Authors: Jun-yi Wu 
Published: December 2019

Abstract
This study discloses a method for quickly comparing the quality of aluminum powder for fireworks and firecrackers based on energy dispersive X-ray fluorescence spectrometer (EDXRF), including the following steps: preparation of samples, establishment of detection methods, determination of the characteristic line fluorescence intensity values of Al element in samples, and according to the measured fluorescence intensity values, the aluminum content in the two aluminum powder samples can be directly compared and determined. The method of the study has the advantages that: (1) the method is simple to operate, and the method can be repeatedly called for testing. Only one new test method needs to be built before the sample test. After the method is established, the test can be repeated at different times without re-establishing the test method for each test. After the first establishment of the new test method, the entire test process only includes three steps: sample preparation, sample loading into the sample cup and on-board testing. (2) The detection period is extremely short. After the sample is prepared, the entire measurement process takes only about 2 minutes. (3) Labor intensity is very low and the requirements for operators are not high. (4) The method has good stability, good repeatability and high credibility.
Numerical simulation of thin film flowing down a vertical uniformly heated plane using the regularized weighted residuals model
Authors: Jiahui Zhao , Riqiang Duan 
Published: December 2019

Abstract
With the developed three-dimensional Regularized Weighted Residuals Model (RM), discussion on its accuracy and simulation work are conducted. It is shown that for small to moderate Reynolds number, the accuracy of RM decreases with increasing Marangoni number and decreasing Biot number of the plane. The streamwise error ratios are larger than spanwise ones and reach a maximum when Reynolds number equals 3, which is due to underestimate of Marangoni instability. The increase of Reynolds number or introducing streamwise most unstable disturbance makes film duration time longer. With increasing Reynolds number, the early stage of wave evolution becomes faster and ripples are more intensive; the final pattern is more unstable and disordered. Heat transfer efficiency reaches two peaks with increasing Reynolds number, one due to the interaction between thermal condition and flow rate, the other due to film no-rupture. Introducing streamwise most unstable disturbance makes the early stages of wave evolution longer and wave amplitude smaller in later stages. Unless Reynolds number is small enough, heat transfer efficiency decreases with the introduction of streamwise most unstable disturbance.
Application of the DOC-DPF Integrated Exhaust Particle Treatment Device for New Marine Diesel Engines
Authors: Tan Weiwei G , Aiguo Chen , Fengyang Zhang , Jinxi Zhou 
Published: December 2019

Abstract
Based on the analysis of the diesel engine post-processing technology line, a DOC-DPF tail gas treatment device is proposed. The exhaust system of marine diesel engine is reformed, the particulate matter purification test is carried out in the exhaust system installation DOC-DPF tail gas treatment device, and the exhaust particulate matter of the marine diesel engine is detected by the automatic smoke tester and other instruments. The results show that the new ship exhaust particulate disposal device can effectively reduce particulate emissions from ship exhaust and is suitable for ships.
Study on the Manufacturing Technology of Guangdong Hand-made Paper
Authors: Zhou Zhong , Xiaopeng Peng 
Published: December 2019

Abstract
Traditional paper-making technology is one of the four great inventions in ancient China. The paper is make by hand and it is found in many areas of Guangdong. Guangdong hand-made paper is mostly used as gods paper, which has special requirements for quality. In order to study Guangdong paper-making technology furtherly, and provide scientific reference for its development, we combed around the factors of materials, tools and processes through experiments, summarized and checked the historical data, then analyzed thirteen processes, such as chopping bamboo, crushing bamboo, beating pulp, papermaking, loosing paper, drying paper and so on. These processes contain rich creative wisdom and are valuable historical heritage. Guangdong hand-made paper technology coexists harmoniously with local environment, and has handed over part of the process to machinery, but its industry scale is small and its economic benefits are not high. It will face the situation of no successor and technical fault. We need to develop Guangdong hand-made paper from the perspective of culture and tourism.
Fracture analysis of casting connector for power grid equipments
Authors: Wang Jun , Feng Chao , Xie Yi , Lian Hu , Long Yi , keLi Deng , Liu Weike , Ouyang Kejian 
Published: December 2019

Abstract
Various failures of casting connector were discussed here. In order to analyze the failure reasons of different samples, a series of tests were carried out, such as macro check, metallographic observation and X-ray penetration method. It turned out that the material defect, casting defect and improper heat process are assigned to be the main reason, respectively. In addition, the corresponding countermeasures were also proposed to improve the quality of power grid equipments.
Study on Constitutive Equation of Cumulative Damage of HTPB Propellant
Authors: Wang Xin , Zhao Ruyan , Yang Ming 
Published: December 2019

Abstract
In order to analyze the interaction of creep and fatigue of composite solid propellant, and provide the basis for calculation of cumulative damage and reliability analysis of the solid rocket motor during the period of storage, the constant stress loading destruction experiment, constant stress amplitude reciprocating tensile experiment and interaction experiments are carried out, then the damage cumulative equation is fitted by the least squares method and also be verified. The results show that there is a logarithmic linear relationship between the loading stress and the creep failure time and the repeated tensile failure times. The verification illustrates that the damage equation parameters can reflect the cumulative damage of propellant well, and the error is less than 10%.
Study on negative Poisson’s ratio structure with low porosity
Authors: Cai Yiqing , Zhu Yongsheng , Yan Ke , Yuan Qianqian , Hong Jun 
Published: December 2019

Abstract
Most two-dimensional negative Poisson’s ratio structures are highly porous, resulting in insufficient structural bearing capacity and only for small strain conditions. In this paper, the simulation method is used to prove that the low porosity and negative Poisson’s ratio structure with concave hexagon has “incremental” behavior, and then the correctness of the simulation model is verified by experiments based on digital image technology (DIC). In addition, the effect of unit cell parameters on the negative Poisson’s ratio at the same porosity is studied. The results show that at the same porosity, the length of the unit cell has the greatest influence on the Poisson’s ratio, and the longer the unit cell, the smaller the Poisson’s ratio; at different porosity, the larger the porosity, the lager the Poisson’s ratio.
Separation performance of hydrocyclone on emulsified oil wastewater floc
Authors: Zhang Ting , Wang Xuesheng , Chen Qinzhu 
Published: December 2019

Abstract
In order to improve the separation effect of emulsified oil wastewater flocs, a new separation method was proposed, which used a hydrocyclone to separate emulsified oil flocs. In this paper, the velocity field, pressure loss and floc volume distribution of the two hydrocyclones were studied by numerical simulation, and the difference of the separation performance of two different structures was investigated. The results show that the separation efficiency reaches to 81.7% and 78.9% respectively; the single cone cyclone has smaller pressure loss and energy loss under the same processing capacity; as the particle size of the floc increases, the separation efficiency of the two hydrocyclones increases. This simulation provides a reference for deep treatment of emulsified oil wastewater.
Research on synthesis and properties of early strength polycarboxylate superplasticizers with different lengths of side chain
Authors: Lai Guangxing , Fang Yunhui , Shao Youzhe , Chen Zhanghua , Guo Yuanqiang 
Published: December 2019

Abstract
A series of early-strength polycarboxylate superplasticizers with different lengths of side chain were synthesized by methyl allyl polyoxyethylene ether (HPEG) as macromonomers with different molecular weights. The structural parameters of polycarboxylate superplasticizers were calculated by gel permeation chromatography method. The performance of the synthesized samples were characterized by hydration heat, X-ray powder diffraction and concrete test. The results show that the longer the side chain be, the better the early strength effect be, when the side chain length is greater than 67.64, the early strength of the synthesized polycarboxylate superplasticizers are better than that of a foreign multinational enterprise.
Research on Arc Spot Welding of T12 Steel
Authors: Wang Yan 
Published: December 2019

Abstract
This paper mainly studied the microstructure change and hardness change of manual arc spot welding of T12 steel before and after post weld heat treatment. The experiment results showed the weld microstructure of J422 and J506 electrodes, which were common structural steel electrodes, were similar under different welding current. The weld microstructure of D256 wear resistance electrode were significantly different from those of structural steel electrodes. The hardness of spot weld before heat treatment had little change except for wear resistance electrode. The hardness of wear resistance electrode was the highest under different welding current before heat treatment. After quenching, the microstructure of spot weld were changed, the dendritic crystal disappeared and the hardness were generally improved. The microstructure and hardness of structural steel electrodes and wear resistance electrode before and after heat treatment were greatly different, which were caused by the different content of carbon and alloying elements of electrodes.
Electrical properties of cement-based composites with highly dispersed carbon nanotubes
Authors: Qin Jie , Li Yanwen , Qu Jian , Sun Zhipeng , Wang Bo , Zhang Weidong 
Published: December 2019

Abstract
In this paper, the effects of dispersion of multi-walled carbon nanotubes (MWCNTs) on the electrical properties of cement-based composites were systematically investigated. Six different types of surfactants were selected to disperse MWCNTs in cement by sonication, and the effect of ionic nature of surfactants on the electrical resistivity of cement-based composites was investigated. Additionally, experiments were carried out to investigate the effect of dosage of MWCNTs on the piezoresistivity of cement composite under cyclic compressive loading. The results show that the ionic nature of the surfactant influence the electrical resistivity of cement-based composites obviously. Furthermore, adding MWCNTs into cement-based composites is justified to improve their conductivity and the repeatability of piezoresistivity.
Assess and Optimization of Automatic Generation Control Performances for Thermal Power Generation Units
Authors: Gao Song , Lu Kuan , Yan Qing , Sun Mengmeng , Yuan Sen , Xin Gang , Wang Jin , Wang Ming 
Published: December 2019

Abstract
Automatic generation control (AGC) plays an important role to maintain real time power generation and load balance, and to ensure the quality of power supply. Power system requires each power generation unit to have satisfactory AGC performance. In addition to the design of AGC control strategy, the characteristics of power generation equipment also affect its performance in AGC control. This paper introduces the assess index of AGC performance of power unit, and analyzes the reasons for the poor AGC performance. Based on the AGC control strategy of thermal power units, the paper proposes an optimization method to improve assess index of AGC performance. Through the implementation of typical industrial case studies, the effectiveness of the proposed method is validated.
Research progress of steel tube rubber concrete
Authors: Tong Shiyu , Liu Yanhua 
Published: December 2019

Abstract
As a new form of concrete-filled steel tube, this paper focuses on the experimental research of the axial pressure performance of steel tube rubber concrete members in recent years, explains and summarizes related research results of hysteresis behaviors and seismic performance. Then further work to be carried out is listed. Finally, the possibility and development trend of its application in practical engineering is discussed.
Research on the Calculation Method of Axial Compression of Round-end Concrete-filled Steel Tube
Authors: Wang Erlei , Xie Jianxiong , Ma Xiaochun 
Published: December 2019

Abstract
Round-end concrete-filled steel tube (RCFST) columns have been applied to bridge structures. There is not the formula of RCFST under axial load in code. Based on the unified theory, the basic form of strength and stability capacity correlation equations of concrete-filled steel tube under axial load is obtained through the theoretical derivation. The formula results compared with finite element simulation results show results are in good agreement.
Research on seismic design method of a beam-column joint in reinforced concrete space frame
Authors: Cui Yanwei , Li Zhenbao , Song Kun , Ma Hua , Tang Zhenyun 
Published: December 2019

Abstract
Earthquake action is multi-dimensional and random. Under bidirectional horizontal direction loading, the seismic capability of beam-column joints in reinforced concrete (RC) frame may be lower than the design capability under unidirectional main direction loading. Detailed calculation methods for the shear bearing capability and shearing performance of RC space joints in frames under bidirectional horizontal direction loading have not been reported. In this work, the shear mechanism and internal force calculation method of an RC space joint under bidirectional horizontal direction loading are analyzed. Furthermore, a shear capacity calculation model is established based on the strut-and-tie model. The prediction of the shear capability in this work are in good agreement with the reported experimental results. This study provides a design method for the seismic design of RC space frame joints, and provides a supplement for the seismic design method of RC space frame with “strong joints and weak members”, when they are subjected to bidirectional horizontal direction loading at the same time.
RETRACTED: Fatigue characteristic and life test of reinforced concrete T girders under cyclic loading
Authors: Zhang Jinquan , Bai Bing , Zhao Shangchuan , Zuo Xindai 
Published: December 2019

Abstract
Aiming at the issue of reinforced concrete girder fatigue, a typical T shaped scale model girder form is selected as the test specimen based on the real structure drawings. On the basis of designing test program reasonably, 7 same batch test girders are loaded with different constant cyclic loading amplitude. Thus according to the test data, girder failure mode, fatigue life, mechanical property evolution law as well as rebar S-N curve is discussed systematically. The result indicate that the longitudinal rod fracture is the domain failure mode of girders, which can finally induces whole specimen rupture brittlely. The mode is clear and definite in the observation. On account of all observation, the longitudinal rod stress range is more regular and stable, which seems suitable for life evaluation. Using the data obtained above, the rod S-N curve equation is calculated by linear fitting method. Result shows the data fit well and all the data lie within the normal range of deviation, which may reveal the law between cyclic load and girder fatigue life.
Research on the method of quickly identifying the types of firecracker based on energy dispersive X-ray fluorescence spectrometer (EDXRF)
Authors: Jun-yi Wu 
Published: December 2019

Abstract
This study discloses a method for rapidly identifying types of firecracker based on energy dispersive X-ray fluorescence spectrometer (EDXRF), including the following steps: preparation of samples, establishment of detection methods, determination of the characteristic line fluorescence intensity values of Cl and Al elements in samples, and identification of types of firecracker based on measured fluorescence intensity values. The method of the study has the advantages that: (1) the method is simple to operate, and the method can be repeatedly called for testing. Only one new test method needs to be built before the sample test. After the method is established, the test can be repeated at different times without re-establishing the test method for each test. After the first establishment of the new test method, the entire test process only includes three steps: sample preparation, sample loading into the sample cup and on-board testing. (2) The detection period is extremely short. After the sample is prepared, the entire measurement process takes only about 2 minutes. (3) Labor intensity is very low and the requirements for operators are not high. (4) The method has good stability, good repeatability and high credibility.
Prediction of Agricultural plastic agricultural plastic film use based on combined prediction model
Authors: Chen Jingmin , Li Fu , Wang Changbao , Sun Yanbin 
Published: December 2019

Abstract
Although increasing the yield of crops, the large-scale use of agricultural plastic film in agricultural production, has caused damage to the ecological environment. This paper analyzes the current situation of the use of plastic agricultural plastic agricultural plastic film in China from 1999 to 2015. The GM(1, 1) model and the ARIMA(0, 2, 0) model are used to predict the mulch usage, and then the optimal weight combination method is used to obtain the grey-time series combination prediction model. The results show that the accuracy of synthetic prediction model is higher than that of the single model and has better applicability. The prediction results of the combined model can be used as a reference for the scientific use and management of agricultural plastic film in China.