bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analysis of the penetration mechanism of CPTU based on large deformation finite element
Authors: Hao Hongchao , Yang Lingqiang 
Published: December 2019

Abstract
The Piezocone Penetration Test (CPTU) is a new in-situ testing technology developed in the 1980s. Compared with the traditional Cone Penetration Test (CPT), it has the advantages of high precision, large amount of data, good stability and wide application. Because of the short history of pore pressure static penetration (CPTU) technology, the CPTU develops slowly in China. By the large deformation, finite element simulation method is used to numerically simulate the CPTU penetration process in ABAQUS software; and the distribution and variation characteristics of soil stress, strain and pore pressure field at different penetration depths are studied. The results show that during the penetration of the cone, there is a stress concentration zone around the cone. The resistance of the cone is mainly the resistance below the cone tip. When the penetration is shallow, the soil is disturbed with the penetration. As the depth increases, the disturbance becomes smaller; according to the variation of the pore water pressure, the water permeable element can be placed at the junction of the conical head and the conical body.
Comparative analysis of vehicle-bridge coupling for different bridge numerical models
Authors: Mao Wangtao , Li Tao , Wang Tao , Zhang Lipeng , Liu Xiao 
Published: December 2019

Abstract
Taking a simple supported T-beam with a span of 30m as an example, firstly, three different finite element models, namely, grillage, shell-beam and solid are established. Secondly, combined with field tests, the above three finite element models are modified by finite element model updating method. Thirdly, based on the finite element software ANSYS, parametric programming and transient analysis function are used to realize vehicle-bridge coupling analysis. Finally, the displacement and stress time histories of the three models under moving loads are calculated and compared with the measured values. The results show that the displacement and stress histories of the solid model are in the highest agreement with the measured values, followed by the shell-beam model. It provides a way of modelling and analysing for vehicle-bridge coupling numerical analysis.
Research on Safety Risk Assessment Technology of Expressway Traffic Operation
Authors: Wang Bo , Chen Renshan , Liu Wenjiang , Li Jin , Song Jie , Zhang Wei 
Published: December 2019

Abstract
Based on the theory of expressway traffic safety and the analysis of accident causes, the risks of expressway traffic operation safety is identified, and a multilevel traffic safety risk assessment system is established. Combined with the advantages of traditional risk qualitative and quantitative analysis methods, the Fuzzy Analysis Theory is introduced in the Analytic Hierarchy Process, the Analytic Hierarchy Process (AHP) is established to weight each related index, and finally the Fuzzy Analytical Hierarchy Process (FAHP) is applied to estimate the risk probability and risk loss. And then according to the risk probability, risk loss assessment and its grade standard, the two-dimensional risk assessment matrix is used to measure the traffic operation risk level and give basic risk management and control criteria. And finally based on the above evaluation system, the traffic safety risk of an important bridge across the Yellow River on the expressway from Beijing to Shanghai is analyzed and assessed.
Research on Minimum Safe Following Distance Model of Trucks on Slope-curve Section of Expressway
Authors: Zhang Fei , Zhang Yan 
Published: December 2019

Abstract
In view of defects in the existing minimum safety distance model, a model for calculating the safe distance on slope-curve section was built based on truck brake system and by fully considering the characteristics of drivers’ driving behaviors and defining the scope of slope-curve section of expressway, and the slope acceleration parameters of “slope-environment” were proposed to effectively calibrate the model, thus providing a basis for selecting the distance value of trucks and the location of traffic signs on slope-curve section. Besides, a following model for trucks was established with TruckSim 2016 software to analyze various indicators such as vehicle slip ratios and vehicle interval value under upslope and downslope states, which verified the effectiveness of the safe distance model.
Study on Application of Simulated Air Pollution Dust the Permeable Concrete
Authors: Yang Min-Jen , Wang Yu-Min , Wang Hong-Yu , Liang Chou-Fu 
Published: December 2019

Abstract
Impermeable pavement is usually adopted in pavement construction in Taiwan. Porous asphalt concrete employs features as water retention, cooling and promoting draining effect. However, with the increase of traffic volume and service duration, its draining function will decrease gradually, wherein porosity blocking is one of the major problems. The research aims at the analogue experiment on pervious concrete subject to dust blocking, which discusses the blocking status and changes in permeability due to natural dust fall and clump dust fall after rainfall. The experiment prepares 4 groups of mixing ratio. The aggregates are coarse and fine bottom ashes from the refuse incinerator. The proportion of cement is 130kg/m3 and 200kg/m3. The experiment simulates the influence and in-situ water permeability changes of specimens with different porosities been blocked by natural dust fall and then the dust been rushed into specimens by rainfall. Before the analogue experiment, the water permeability of 4 groups of specimens is 1399.75∼1412.91ml/15sec. The experiment adopts 2011 average monthly dust fall in Pingtung County and magnifies it by 10 to 20 times to simulate natural dust fall and clump dust fall on the pavement accordingly. It is known from the experimental results that due to the high porosity of pervious concrete, by ruling out other blocking factors, the natural dust fall has little influence on the water permeability of pervious concrete. While the simulation of clump dust fall is 15 times the natural dust fall, although water permeability the pavement is reduced sharply, it still meets the minimum 400ml/15sec of Japanese porous pavement technical indicator. It shows that the specimens have good permeability on future practical applications.
Research on Reasonable Design of the Front View Triangle Area of the Front Side of the Road Mixing Nose Based on Driving Safety
Authors: Han Xinyu , Wu Xuezhu , Jin Yi , Zhang Fei 
Published: December 2019

Abstract
In order to improve the limitation of formulation for sightline triangle area in Design Rules of Highway Grade Separation JDG/TD-2014, which is 100 meters before confluence nose for the main line and 60 meters before that for the ramp, this paper analyzes the driving and vision characters considering the driving safety. The reasonable design sizes of sightline triangle area for different mainline driving speeds are given, using the available sightline model.
Study on Long-distance Turn-around at Non-Signal Control Intersection of First-Class Highway
Authors: Wu Xuezhu , Jin Yi , Han Xinyu , Ye Ying 
Published: December 2019

Abstract
Long-distance turn-around is a traffic organization method to guide and improve left-turn vehicles at intersections. In this paper, the non-signal control intersection of the first-class highway is taken as the research object. The influence of different road conditions, traffic flow size and traffic control on the selection of long-distance turn is analyzed, and the location of long-distance turn is preliminarily determined by calculating the length of interlaced section. Through VISSIM simulation, the position of telemetry turn is finally determined.
Study on the mechanism of the influence of structural change on China’s carbon emissions
Authors: Yan Xiaoqing , Ma Xue , Zhang Xiangcheng , Li Nan , Ma Jiajun 
Published: December 2019

Abstract
Revealing the influential mechanism of important factors on carbon emissions of economy or industry is the premise of formulating effective emission reduction policies and implementing positive emission reduction measures, and also a hot research topic in academic circles. This dissertation constructs a theoretical model for analysing the mechanism of carbon emission impacts considering structural factors. The impacts of changes in demand and supply linkages in the production links of the economic subsystem are incorporated into the decomposition model, and key industries and factors affecting carbon emissions at the production and demand sides are identified and quantitatively analysed from the perspective of the subsystem. The main conclusions are as follows: The change in energy use structure and production efficiency is the main reason for the downward trend of carbon emissions. The effect of the change of demand structure on emission reduction is far less than that of the change of production structure factors, and the change of demand structure is not always advantageous to emission reduction during the research period. In the short term, promoting the optimization of production and demand structure is still an important effort to promote emission reduction. In the long run, the emission reduction effect of energy structure optimization is the most significant.
The Research of Debris Flow Disaster Prevention and Response System in Taiwan
Authors: Chen Shu-Tzu , Hsu Chung-Li 
Published: December 2019

Abstract
The Taiwan Disaster Prevention and Response Act had been issued and put into practice on June 30, 2000. Roughly, that the disasters prevention and response system with three levels, namely the organization of central, county, and township. Due to above plans, the Council of Agriculture, Executive Yuan, become the director organization for the debris flow disaster prevention, for this work promoting smoothly, the Council of Agriculture drawn up debris flow disaster prevention works from February 22, 2002, such as Operating Procedures for Debris Flow Disaster Evacuation, Operating Procedures for Collection and Reporting of Debris Flow Disaster Information, Implementation Guidelines for Debris Flow Disaster Prevention Education and Publicity, Operating Procedures for Forecasting and Warning of Debris Flow Disasters, and Operating Procedures for Prevention of Repeated Debris Flow Disasters and for Recovery and Reconstruction, in order to set up the implementation emergency practice mechanisms of debris flow disaster prevention and response system in each stages, and each kinds disaster prevention and response operation normalizing, combine, coordinate, and practice. Although that carry out already several years, but there were some cognitive problem between each level’s organization exultantly. Thus this research synthetically sums up the experience of carrying out from the aspects of decree, organization, and operation, to inspect and offer the suggestion of making a self-criticism, improving, and defend for the reference of Regional Disaster Prevention and Response Plan.
Study on Performance of Ground Source Heat Pump System Based on Active Chilled Beam
Authors: Yu Wenhong , Li Hui , Niu Xiaojie 
Published: December 2019

Abstract
This paper takes the ground source heat pump unit of a research and development centre in Beijing as the research object. This collected the operation data in the cooling condition and the heating condition respectively. Based on the measured data, this paper calculated the coefficient of performances and the energy efficiency ratio of the unit. The results show that when the active chilled beam is used as the air-conditioning terminal device, the inlet temperature of the heat pump unit is greatly improved. The ground source heat pump unit meets the standard and has a higher energy efficiency ratio; The operation of a single unit is more efficient than that of multiple units at the same time.
Indoor Thermal Environment Control System Based on Maximum Work Efficiency
Authors: Yu Wenhong , Bai Jinchao , Jiang Chaowen 
Published: December 2019

Abstract
Based on the indoor thermal environment on the influence of the office personnel work efficiency on the basis of experimental research. In this paper, a control method based on maximizing work efficiency is proposed, which aims at maximizing indoor staff’s work efficiency and rest efficiency, and takes Predicted Mean Vote (PMV) as control parameter to control indoor environment, taking into account the requirements of comfort. The operation effect of the control method based on maximum work efficiency is estimated. It is found that compared with the traditional control system based on PMV index, the system not only improves the work efficiency and rest efficiency of indoor personnel, but also is more comfortable. The indoor environment control system based on maximizing work efficiency is still in the theoretical stage. The construction and actual operation effect of the system need to be further studied.
Research on Safety Risk Assessment of Ninghai 4A Scenic Spots
Authors: Wang Qianqian , Kong Song , Chen Jianhua , Zhou Ying , Yu Chaolu , Huang Hui 
Published: December 2019

Abstract
With the rapid development of tourism, the tourist population is expanding. The security of tourist attractions is sensitive and fragile, and the accident risk is high and the social impact is great. Therefore, it is necessary to carry out risk assessment research. This paper takes Ninghai 4A scenic spot in Zhejiang Province as the research object, objectively identifies and analyses six kinds of accident risks such as firefighting, falling casualties and so on, establishes three-dimensional risk matrix model, and combines Borda ordinal value method to identify the main risk of scenic spot. Based on the risk identification and assessment, some reasonable risk management and control measures are proposed. Relevant research can provide reference for the safety risk assessment and control of similar scenic spots in China.
Spatial Distribution and Evaluation of Heavy Metal Pollution in Soil Around Coal Gangue in Fengfeng Mining Area
Authors: Zhang Yanjie , Zhang Haoran , Meng Lingyao , Wang Yunxia , Zhang Yan 
Published: December 2019

Abstract
Taking the soil around the coal gangue mountain in the Fengfeng mining area as the research object, 30 soil samples were collected in the east, southeast and southwest directions within 300m of the coal gangue mountain boundary, and the soil in the mining area was measured by inductively coupled plasma mass spectrometry. The contents of five heavy metals such as Cr, Pb, Cd, Cu and Zn were detected, and the spatial distribution characteristics, pollution status and ecological risk of heavy metals in the mining area were analysed. The results show that: (1) the five heavy metals content of Cr, Pb, Cd, Cu and Zn show different decreasing trend from the farther gangue heap and the increase of soil depth. (2) Referring to the background value of the national secondary soil environmental standard, among the five heavy metals in the soil, except for Cu and Cr, the average values of three heavy metals of Zn, Cd and Pb are higher than the soil background value; Single factor index evaluation results show that the Pb pollution is the most serious, followed by Cd pollution. The Nemero comprehensive index method shows that the surface soil is moderately polluted when the distance is zero in the three directions, and the rest places are mildly polluted. (3) According to the ecological risk assessment results, the order of potential ecological hazards of single heavy metals are ranked from strong to weak: Cd>Pb>Cr>Cu>Zn, and the soils are all slightly ecologically harmful.
Research Progresses and Needs on Fire Safety of Rural Building in Southern Region of China
Authors: Liu Yongjun , Liu Wenli , Luan Jingru , Tian Yujia 
Published: December 2019

Abstract
In recent decades, numerous rural buildings, especially residential ones in southern region of China, have been damaged seriously even destroyed totally by fire hazards. Fires in rural buildings can result in significant losses of life, property, and cultural heritage. Therefore, fire hazards in villages and towns are becoming a growing concern from common people, related experts, to central government. There are few literature on research of rural buildings exposed to fires in China. In this paper, several typical rural building fire cases are introduced firstly. Mechanism of fire spread and structure collapse is qualitatively investigated secondly. Some research progresses and needs on rural building fire in China are given thirdly. The authors hope this paper may provide valuable information for people who hope to learn about the current situation, research progresses and needs on fire safety of rural buildings in China.
Measurement and Study on the Torque Coefficient of Ordinary Bolts Before and After Galvanization
Authors: Wen Jiang , Wei Zhai , Jinhu Yang , Junfen Yang , Yuhao Zhan , Kai QU 
Published: December 2019

Abstract
Galvanization is widely applied to bolts as an anti-corrosion method in bolted connection of steel structures in power transmission engineer. After being galvanized by hot-dipping, the torque coefficient of bolts will be changed. To investigate this change, the torque coefficients of ordinary bolts in different grades and specifications were measured before and after galvanization. Results indicate that mean values and standard deviations of torque coefficients of the galvanized bolts increase to a certain extent, but the torque coefficients and the standard deviations tend to decline as the improvement of bolt specification, and the stress of ungalvanized ones is larger than that of hot-dip galvanized bolts in the same grade and specification.
Application of Electro-Sorption Desalination Technique in Water Treatment
Authors: Chen Kaiwei , Lin Hua , Lin Yi , Liu Zhaojun , Cai Tongbo , Chhuond Kong 
Published: December 2019

Abstract
Electro-Sorption Technology (EST) is also known as Capacitive Deionization (CDI).
It originated in the late 1990s. Electro-Sorption desalination technology is a new water treatment technology that uses the phenomenon of ions and charged particles adsorbed on the surface of charged electrode to enrich and concentrate dissolved salts and other charged substances in the water on the surface of electrode to realize water purification/desalination. As a new water treatment technology, Electro-Sorption technology (EST) has the characteristics of low inlet water quality, reliable operation, low energy consumption, convenient operation, high water yield and low comprehensive operation cost. The electrode material with high activity is the key to obtain its high performance. According to different water quality conditions, the electrode material which is good for ion adsorption in solution should be studied. The application of this low-energy water purification technology in real life has become a new research hotspot.
Study on seepage characteristics of Cr3+ polymer gel and its mechanism-taken M oilfield in Changqing as an example
Authors: Yang Haien , He Zhiwu , Ren Jianke , Zheng Lijun , Lu Xiangguo , Cao Weijia , Kuai Jingwen 
Published: December 2019

Abstract
Cr3+ polymer gel has strong salt tolerance, retention capacity and reservoir adaptability. This technology has obtained a significant effect of oil increasing, and the economic benefits was good. In order to meet the demand of improving oil recovery of M oilfield in Changqing, Seepage characteristics of Cr3+ polymer gel and its mechanism were carried out. Results showed that when the polymer concentration of polymer and Cr3+ polymer gel were the same, viscosity and molecules aggregates diameter of them were basic the same, but the resistance coefficient and residual resistance coefficient of Cr3+ polymer gel was larger. It could be explained that the retention ability of Cr3+ polymer gel was stronger. With the increase of relative molecular weight of polymer, the resistance coefficient and residual resistance coefficient of polymer and polymer gel also increased. When core permeability increased, the resistance coefficient and residual resistance coefficient decreased. Compared with polymer solution, Cr3+ polymer gel had higher resistance coefficient and residual resistance coefficient, and residual resistance coefficient was larger than resistance coefficient. The mechanism study showed that water dilution in subsequent water flooding stage would cause molecular chain expansion in polymer gel, which caused the diameter of polymer gel molecular aggregates and retention in pores increasing.
Study on the Property and Mix Ratio of CA and L•SAC Recycled Aggregate Planted Concrete
Authors: Chen Jianguo , Jiang Tao , Li Ruoyu , Wu Guangjun , Lifang Tiancheng 
Published: December 2019

Abstract
This paper studies the influence of different water-cement ratio configuration of recycled aggregate planted concrete on performance, the permeable property and drying shrinkage and the influence of different gelled material against compressive strength. At last, the plant growth performance of the planted concrete is analyzed through the whole process of screening, seeding and long-potential recording of the plants. It is found that the compressive strength of CA-R (recycled aggregate aluminate cement concrete) and L•SAC-R (recycled aggregate have low alkalinity) is higher, which is 7.6 MPa and 7.4MPa, respectively. Compared with the natural aggregate, the against compressive strength of the recycled aggregate is much smaller, and the difference of the experiment blocks with different age conditions is not large; It is better to set the porosity of the planted concrete between 22% and 35%: On the one hand, the total porosity of the recycled aggregate planted concrete is always slightly higher than that of the natural aggregate planted concrete, which is basically maintained at 31.7% and slightly higher than the design value; On the other hand, the total porosity of CA-R is larger than that of L•SAC-R and P•O-R (recycled aggregate ordinary Portland cement concrete), and compared with the total porosity, the variation of connected porosity is not obvious. In addition, the water permeation coefficient of 20-40mm single-stage concrete is between 15-19mm/s; And the dry shrinkage of aluminate recycled aggregate planted concrete is larger, there are different degrees of cracks on the surface and aggregate bonding. Among the three plants selected during the experiment, Festuca arundinacea and Alfalfa had good adaptability, but Bermuda grass had low adaptability.
Comparative study on ozone oxidation chemiluminescence method and classical alkaline potassium permanganate method for determination of chemical oxygen demand in seawater
Authors: Wang Zhaoyu , Wang Wei , Gao Yang , Lv Hongmin , Zhang Yanmin , Liu Yan , Ma Ya , Zhang Yingying , Chu Dongzhi 
Published: December 2019

Abstract
Seawater in the coastal waters of Qingdao, China was collected, and COD was measured by ozone oxidation chemiluminescence method and alkaline potassium permanganate method which was adopted in China as the standard method for measuring COD in seawater, respectively. The results show that when COD was less than 1 mg/L, the absolute error of ozone oxidation chemiluminescence method was less than 0.1 mg/L, and when COD was more than 1 mg/L, the relative error was less than 10%. The relative standard deviation of ozone oxidation chemiluminescence method was lower than 5%, and the detection limit was 0.0022 mg/L. The results of ozone oxidation chemiluminescence method were close to those of alkaline potassium permanganate method. With higher precision, lower detection limit, faster measurement, and online measurement, ozone oxidation chemiluminescence method is an ideal monitoring method for COD in seawater in the field.