bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dynamic mechanical response for bituminous mixtures in wide frequency range
Authors: Yin Y L , Yang Z H , Shi M L 
Published: September 2019

Abstract
The rheological properties of bituminous mixtures at different test temperatures have been determined by means of a Dynamic Mechanical Analyzer (DMA) via frequency sweep with a relatively wide range between 0.02 Hz and 200 Hz. The measurements were carried out by controlled-strain mode in three-point bending beam test. Continuous spectra were obtained, covering four decades of the frequency scale for phase angle as well as storage and loss moduli with loading frequency. The storage and loss moduli are found to increase as loading frequency increases and temperature decreases. The variation of phase angle with frequency is complicated. Under low test temperature, the phase angle decreases with increasing frequency; under higher temperature, it shows a contrary trend. It is interesting that a peak phase angle appears for these bituminous mixtures in the intermediate temperatures. In addition, the DMA measurement can be used as an effective method to evaluate the viscoelastic properties of bituminous mixtures with fine aggregates.
Finite Element Analysis of Geotechnical Excavation Based on COMSOL Multiphysics
Authors: Han Jue , Ma Qianqian 
Published: September 2019

Abstract
As the current geotechnical excavation process is affected by many factors, excavation will easily lead to abnormal conditions in the geotechnical excavation process. Based on this, this study used COMSOL Multiphysics finite element analysis to analyze the various factors affecting the geotechnical excavation process and set the various parameters of the project. This study studied the geotechnical excavation works in the presence of buildings and the absence of buildings. At the same time, the data were statistically analyzed and the changes of various parameters in the process of geotechnical excavation were studied on the basis of finite element simulation analysis. The research shows that COMSOL Multiphysics finite element analysis can effectively imitate the geotechnical excavation conditions and draw effective laws, which will be helpful for the effective development of follow-up projects and provide theoretical reference for subsequent related research.
Modeling and simulation of high-speed cylindrical grinding based on 3D grinding wheel topography
Authors: Chen H P , Cao H Y , Wu R L , Lu C 
Published: September 2019

Abstract
The purpose of this paper is to establish a 3D virtual grinding wheel to illustrate the high-speed cylindrical grinding process of difficult-to-machine materials under various process parameters. Based on Monte Carlo method, the abrasive grain is modeled cutting spherical solid with random planes, and the random distribution of grains is obtained based on the virtual grid method. Then the grinding wheel topography is trimmed to adjust the protrusion height of abrasive grains. The simulations of high-speed cylindrical grinding under different grinding conditions are carried out considering the thermomechanical coupling effect of grinding wheel and workpiece. The 3D grinding wheel is validated by analyzing the grinding force ratio. The effects of cutting depth on the grinding performance, such as grinding force, workpiece temperature, effective stress and surface quality, are discussed. The results show that a smaller depth of grinding is beneficial for better surface quality.
The Theoretical Research on Technical Advance and Innovation Integration of Tapping Machinery
Authors: Wang Lingling , Cao Jianhua , Zheng Yong , Huang Chang , Wu Sihao 
Published: September 2019

Abstract
Mechanical tapping becomes an important issue to be resolved in urgent need at present, which is one hot problems of the technology research at present. This paper introduces the progress and frontier of tapping technology, and analyses and summarizes the research on semi-automatic tapping machinery and automatic tapping machinery. The development of mechanical tapping is still at the exploration stage, and the fundamental theory research is insufficient. The technology needs to move from prototype stage to more mainstream use for quite some time. The type 4GXJ-I of cordless brushless tapping knife designed by our team and automatic tapping machinery designed by Zhenkun Xu in China, have presented obvious advantage in the study of mechanical tapping machine. Application of mechanical tapping machines has a very important significance to sustainable development of natural rubber industrial economy.
Motion and Static Simulation of Horse Riding Machine
Authors: Yang Xi 
Published: September 2019

Abstract
Horse riding machine is a typical fitness equipment, which is widely used in various fitness places. 3D model of the riding machine is established by using SolidWorks to make people feel more comfortable. Motion simulation is conducted to obtain the position, velocity and acceleration of the saddle, pedal and armrest. Then, static simulation is performed to get the maximum stress of the horse riding machine.
Analysis of aerodynamic characteristics of flapping process of imitation beetle folding wings
Authors: Wang Xinjie , Hu Kun , Wang Caidong , Zhang Zhigang 
Published: September 2019

Abstract
In this paper, the beetle rear wing is used as a bionic object to study the aerodynamic characteristics of the flapping wing aircraft during flapping. Firstly, a three-dimensional folding wing three-dimensional model was designed according to the folding mechanism of the beetle wing. Then the influence of different flapping angle of attack, torsion time and crease width on the aerodynamic characteristics of the rigid folding wing was analyzed by ANSYS FLUENT software. The results show that the flapping angle of attack has a great influence on the aerodynamic characteristics of the foldable wing. Appropriate reduction of the torsion time and crease width can improve the aerodynamic characteristics of the folded wing.
Vibration analysis of milling process with helix-angle cutter based on Euler method
Authors: Jin G , Zhang XY , Li ZJ , Sun GX 
Published: September 2019

Abstract
The chatter vibration is the major limiting factor in increasing the metal removal rates of the machine tools. In this paper, a program for dynamic analysis of thin-walled milling process with helical milling cutter is developed, based on Euler iteration. The program can take into account the characteristics of thin-walled workpiece, the contact separation between workpiece and cutter, the helical angle of cutter teeth and other actual cutting process characteristics. Based on the stability lobe diagram obtained by semi-discrete method, the stability simulation in different cutting parameters around the stable island was carried out. The unstable form of the cutting process was determined by spectrum analysis and Poincare mapping method. The results show that the method is in good agreement with the results of stability Lobe diagram and can capture the stability island in small radial cutting process. This method can well grasp the cutting force and vibration evolution process in cutting process, and provide an effective means for stability analysis of cutting process.
Quantification characterization of micropores in G20Mn5N cast steel at two different stages
Authors: Yan Huadong , Jin Hui 
Published: September 2019

Abstract
Cast steel is an important metal material that is widely used in civil engineering structures due to its high strength and good ductility. However, a variety of casting defects such as micropores are usually present in the as-cast components. Casting defects are the main factors leading to the degradation of mechanical properties. In this paper, X-ray tomography is used to quantify the quantity, size distribution of micropores in G20Mn5N cast steel. In the nine notched samples, the quantity of pores increases from 2726 in the undeformed stage to 6440 in the fractured stage. Compared with the undeformed stage, the total volume and the average volume of the micropores in the fractured stage are also increased. Furthermore, the distribution of equivalent pore diameter of the two stages is studied, which is consistent with the three-parameter lognormal distribution.
Casting simulation of cast steel joint based on Pro-CAST
Authors: Gao Yiqi , Sun Sijia , Jin Hui 
Published: September 2019

Abstract
The casting process is usually divided into five steps of melting, molding, casting, heat treatment and testing. This paper focuses on the two stages of casting and quality inspection of a casting process for a cast steel joint in actual engineering. Studies have shown that the sharp change or improper arrangement of the sections of cast steel joints will make certain areas more likely to produce defects than other areas, and these areas are often complex stress locations when they are in service, which leads to “risk-on-risk”. So both structural design and process design should pay attention to these issues. The analysis results show that ultrasonic flaw detection can detect casting defects but cannot be quasi-deterministic. The setting of riser and cold iron plays a key role in casting quality. The design of riser has a great influence on the generation and distribution of casting defects.
A scalable fuzzy division model of topological space on GIS
Authors: Jun Xiang 
Published: September 2019

Abstract
It is difficult to describe topological relationship of complicated geographical phenomena and entity with fuzziness and uncertainty in the real world. Aiming at the above problem, this paper has summarized to the topological relationship of between spatial entities with 4-intersection model and 9-intersection model firstly. On the basis of point-set topology, the formal description model of the topological relationship between fuzzy geographical entities is analysed and gives a detailed and accurate formalization-description and strict math formula. Lastly, this paper proposes a method, which improves and expands topological division to between fuzzy geographical entities. It shows that analysing result, the model can analyse and divide the entity fuzzily from simple entity to complicated entity.
Research Advances in Tight Oil and Its Prospect
Authors: Si Qinghong , Sima Xianzhang , Zhang Chao , Wang Shanbo , Zhang Bo , Zhu Qiang 
Published: September 2019

Abstract
Tight oil has broad prospects for exploration around the world. There have been achieved success exploration and development of tight oil reservoirs in some foreign basins. China has a large area of unconventional oil and gas resources, of which coalbed methane and shale gas have been well studied, but tight oil is still in its infancy, and its evaluation basis is still weak. By analyzing the control factors of tight oil accumulation, the accumulation process and the accumulation dynamiction, it is believed that the basic theoretical work of tight oil accumulation should be carried out as soon as possible. Especially, there is an urgent need for breakthroughs in the study of the time relationship between tight oil accumulation and reservoir densification and formation mechanism of tight oil reservoir-forming dynamiction.
Circulating current suspression for parallel modular energy storage converter based on improved single neuron PID
Authors: Xu Jun , Wang Kun , Deng Chaoran 
Published: September 2019

Abstract
To solve the parallel circulating current problem in the operation control of modular energy storage converter, the causes of the parallel circulating current are analyzed, and a new circulating current suppression method based on improved single neuron PID is proposed. The superiority of the method is verified theoretically by building simulation model. The test verification is carried out by developing 50kW power module and 150kW modular energy storage converter prototype. The results show that the method can effectively suppress parallel circulating current and solve the problems of difficult parameter adjustment and poor adaptability to power mutation in traditional PID control.
RETRACTED: Research on the Construction of Early Warning Index System of Network Public Opinion Emergency Based on Computer Simulation
Authors: Ge Hongbing 
Published: September 2019

Abstract
Under the current social background of our country, the dissemination environment, dissemination background, audience characteristics, media environment and event types of network public opinion are constantly developing and changing, and the influencing factors will also have new changes. The early warning index system of network public opinion emergencies is an important part of the crisis management of network public opinion. The analysis of network public opinion is based on the complete and accurate grasp of network public opinion. The early warning of network public opinion emergencies is based on the full exploitation and utilization of network public opinion data. Through the analysis and judgment of public opinion, the early warning mechanism of network public opinion emergencies can be improved. Computer simulation is a fast and economical important research tool, and the effectiveness and accuracy of computer simulation depends on the performance of computer simulation software tools. Using computer simulation and simulation of the process of user concept in event propagation, dynamic evolution simulation of events is analyzed according to the results of user concept, and hot events are identified.
Localization Transformation of Industrial Residential System: A Case Study on SI System in China
Authors: Zou J M , Tang S N 
Published: September 2019

Abstract
The SI (SkeIeton-Infill) System originated from Japan and introduced to China in 2006. The build-up projects proved the technical feasibility of SI System in China. However, the localization transformation of SI System has not completed in China. Based on literature review, the main determinants of influence mechanism are revealed to be housing ownership model, residential scale, and residential form. The content analysis revealed the potential influences on the uptake of SI System in China. This research sought to reveal the influence mechanism of social environment on industrialized design system. The practical value of the research is providing guidance for policy makers and designers to help them improve design quality of SI System in China.
Effect of Pre-stress in Steel Strips to Strengthen Unreinforced Brick Masonry Walls under Axial Loads
Authors: Jing Deng-Hu , Zhang Han , Bao Ning 
Published: September 2019

Abstract
Using steel strips to strengthen the existing unreinforced masonry walls has competitive advantages, which includes no wet work, avoidance of formwork, time saving, ease of installation, minimal increase of dimensions, no requirement for material strength of the existing walls and good reversibility. In this paper, seven specimens were fabricated and tested under axial loads for obtaining the effect of pre-stress in steel strips to strengthen unreinforced brick masonry walls. Test results showed pre-compression stress in the vertical steel strips could increase the load of cracks in the single brick in the wall, otherwise steel strips only improved the load of continuous cracks and the failure load, and the axial stiffness of the wall; when the transverse steel strips were pre-tensioned, it could further improve the failure load and the later axial stiffness of the strengthened wall.
Research on the characteristic of seismic damage and seismic design of reinforced concrete simply-supported girder bridge
Authors: Dai Pan , Xu Peng , Lu Jiufei , Zhao Gaojin , Mao Dejun 
Published: September 2019

Abstract
In previous earthquakes, the bridge in the earthquake zone has been seriously damaged; especially the reinforced concrete simply-supported girder bridge that with poor integrity. In order to study the earthquake damage character and behavior of the reinforced concrete simply-supported girder bridge, according to the survey data of earthquake damage of the reinforced concrete simply-supported girder bridge, that occurred in several major earthquakes in China in recent years, earthquake damage characters of this kind of bridge are classification analyzed. According to the earthquake damage characters, seismic design countermeasures are put forward, which can provide reference for aseismic design of reinforced concrete simply-supported girder bridge.
Construction of risk evaluation index system of housing construction project based on PSR theory
Authors: Cheng Lian-Hua , Zhang Yan-Hua , Wang Zi-Yue 
Published: September 2019

Abstract
In order to enhance the comprehensiveness and rationality of the construction risk assessment index system construction project, this paper divides the risk assessment unit according to the risk composition and risk characteristics of the accidents during the construction of the housing construction project, combined with the actual situation on site. Through the analysis of accident cases, relevant norms and standards, and the analysis of domestic and foreign literatures, the risk factors affecting the construction safety level of housing construction projects are extracted. At the same time, the theory of PSR is introduced to broaden the research scope of engineering construction risk assessment, and the construction model suitable for the construction process evaluation model of housing construction project is proposed. Based on the causal relationship of various risk factors, a systematic and scientific safety evaluation index system is constructed.
Game Analysis of Project General Contracting Rent-seeking
Authors: Cheng Lian-Hua , Wang Zi-Yue , Zhang Yan-Hua 
Published: September 2019

Abstract
It is important to clearly understand the rent-seeking behavior of all parties involved in the general contracting mode. First, the formation mechanism of rent-seeking was analyzed. Then, the game model of the owners, general contractors, supervision units, government and society during the operation of the general contracting project was proposed, to explore the decision-making space and behavior mechanism of relevant stakeholders. Finally, the optimal decision-making of the game players under different situations was discussed. The results show that the general contractor and supervision rent-seeking probability is affected by the owner’s supervision cost and supervision probability; the probability of owner supervision is related to the ability of owner and government public to supervise and punish rent-seeking behavior; and the ability of government and public to supervise is related to the cost of supervision and the reward value of supervision success.
Performance and Dynamic: Study on Spatial Evolution of Peripheral Areas of Metropolis in Suzhou
Authors: Lei Cheng , Sun Mengyi , Wang Haitao 
Published: September 2019

Abstract
Choosing Suzhou as the research area, taking the administrative area as the unit and starting from the performance and dynamic perspective, this paper analysis spatial evolution characteristics of Suzhou metropolis peripheral area by remote sensing image, constructs spatial performance evaluation system by AHP, and evaluates the spatial performance of the five areas in Suzhou. Combined with the three typical case of Industrial Park, High-tech Zone and Wujiang Region, this paper discuss the mechanism of spatial evolution from the perspective of subject, and sums up three types of spatial evolution and interaction mode of action. The study finds that the types of dynamic have a close relationship with the formation of spatial performance echelon, and reveals the change of performance and dynamic mechanism in the spatial evolution of metropolitan area in Suzhou.
The Present Situation and Design Implications of Traffic Connection in Beijing Railway Transportation Hub Station
Authors: Ma Jing , Fang Ming , Wang Junzhe 
Published: September 2019

Abstract
Through the multi-period, multi-objective and multi-level investigation and analysis of the existing national railway hubs in Beijing, the main problems in the current operation is that the urban space connection and various types of traffic connections. The reason is that the railway hub transportation station should focus on development positioning, site selection layout, traffic matching and predictive design in the planning and site selection design process. The key points can be used as a useful reference in the design of the similar ones.
Exploration and reflection on the practice mode of the responsible planner system in Beijing Core Area from the perspective of urban renewal
Authors: Wang Junzhe , Ma Jing 
Published: September 2019

Abstract
Based on the clear positioning of Beijing core areas in the new urban planning of Beijing, Dongcheng District and Xicheng District have carried out a series of urban renewal work of “Environmental Remediation of hundreds of streets and allies” and “Rearrangement Planning of Blocks”. Both districts explored and established the responsibility planner system in 2017, aiming to achieve refined construction and management in the process of organic renewal, and ensure the implementation of the plan and public participation. This paper, combined with the visiting and investigational results of the urban renewal project in Beijing core areas, sorts out the duties and roles of the responsibility planners in each step, explores the establishment and promotion of the responsibility planner system, analyzes the optimization space of current system and proposes several advices on the follow-up system.
Study on Dust Emission Characteristics of Construction Sites in Hengyang City
Authors: Xie L , Ding Y C , Shi L 
Published: September 2019

Abstract
In this study, six typical construction sites in Hengyang City were selected to monitor the dust emission concentration in earthwork stage, main structure stage and decoration stage. The average monitoring time of each stage is 2 or 3 days, totally 15 days. 45 samples of quartz filter were obtained. The initial emission factors and emission inventory of building dust were estimated based on FDM model. The results show that the average net concentration of earthwork stage, Main structure stage and decoration stage are 162 ug/m3, 72 ug/m3 and 54 ug/m3 respectively. PM10 emission factor is the largest in the stage of earthwork foundation, followed by the stage of main structure, and the lowest in the stage of decoration. The actual emission factors are 0.449, 0.177 and 0.149 g/(m2.h).
Carbon Emission Prediction of Civil Buildings in China based on Improved Grey Prediction Method
Authors: Yuan J B , Liu Y S , Xu J , Gao S H , Li X T 
Published: September 2019

Abstract
Civil construction is an important source of carbon emissions. The implementation of total carbon emission control for civil buildings is an important means to achieve energy conservation and emission reduction in China. The study divides civil buildings into urban residential buildings, rural residential buildings, public buildings, and northern urban heating. The study calculates and predicts the total carbon emissions of China’s civil buildings. Firstly, according to the statistical method of IPCC, the calculation model of carbon emissions of civil buildings is constructed, and the total amount of carbon emissions of civil buildings in China from 2005 to 2016 is calculated by using the energy balance table. Further, based on the improved grey prediction method, the national civil use from 2017 to 2025 is predicted. Total carbon emissions from construction. The forecast results show that in 2017-2025, the annual average carbon emission growth rate of buildings is about 4.65%, and by 2025, the total emission is expected to reach 298.176 million tons of CO2. In order to achieve the 2030 emission reduction target, it is necessary to further optimize the energy structure, improve the energy efficiency of the building, and increase the carbon emission reduction in civil construction.