bluuebunny/crossref_metadata_2025_split huggingface dataset:
The influence rule of highway curve radius on speed perception and operating speed
Authors: Liu Ting , Xu Jinliang 
Published: December 2019

Abstract
In order to understand the influence of the radius of horizontal curve on driver’s speed perception, driving simulation experiments were carried out in the route scene with radius from 400 m to 1000m based on Uc-win/road driving simulation system. The real-time speed and acceleration parameters of the whole section of the vehicle were collected by ECO driver plug-in built in the software, and the driver’s perception speed at feature points is acquired by “inquiry method”. The perceptual speed and actual speed at the feature points are compared and analyzed. The results show that when the roadside environment is monotonous, the perceptual speed of the driver is lower than the actual speed, and the perceptual speed near the entry curve is much lower than the actual speed. However, the radius of the curve has little effect on the estimation error of vehicle speed at the turning point., after the midpoint of the curve, the accuracy of drivers’ perception of speed is gradually improved; when the radius of the horizontal curve is large, the speed of the vehicle is not affected by the radius of the curve.
Research on the Mechanical Characteristics of Long Span Cantilever Casting Deck Arch Bridge
Authors: Jiao Fengzhi 
Published: December 2019

Abstract
In order to study the mechanical characteristics of long span cantilever casting deck arch bridge, taking Jiashi super-large bridge with 225m main span as an example, and the finite element software Midas civil is used to analyze the mechanical characteristics of the completion state of the bridge and the changes of the internal force in each construction stage. The results show that the internal force at each segment of the arch ring is small and uniform when the closing segment of long span cantilever casting deck arch bridge is constructed, which can make the closing operation of the main arch ring safely and smoothly. What’s more, the internal force at the arch feet and vault of the main arch ring is large when the bridge is completed, while the internal force at the two construction segments adjacent to the vault is larger than that at the vault which needs to be paid more attention.
Study on Dynamic Response of Arch Bridge under Vehicle Braking Based on Model Updating
Authors: Gao Guijie , Wang Tao , Li Tao , Li Zhenyang 
Published: December 2019

Abstract
In view of the insufficiency of the current research on special driving, this paper modifies the finite element model based on the static and dynamic measured data, and obtains the benchmark model reflecting the true state of the actual stress state. The influence of braking position and deceleration on key components of arch bridge is studied by establishing the vehicle-bridge coupling model under braking action and choosing three axles to load. The results show that the braking force of vehicle has a great influence on the dynamic response of key parts of arch bridge, and increases with the increase of braking deceleration. At the same time, the influence of vehicle braking force on the arch bridge column is obviously greater than that on the main arch ring.
Modeling Confined Compression on Structured Soils
Authors: Zhu Enyang , Wang Shaokun 
Published: December 2019

Abstract
In confined compression on structured soil, due to the exertion and decay of soil structure, the ratio of horizontal to vertical stresses is low in the earlier compression stage and tends to be the same as normally consolidated soil finally. In order to describe this behavior, the structured unified hardening model (structured UH model) was extended in the following 2 aspects: (1) properly selecting Poisson’s ratio to reflect the stress ratio in earlier compression stage; (2) adding a shape parameter in dilatancy equation to control the stress ratio in final confined compression stage. According to the comparisons between model simulations and test data, the extended structured UH model is qualified in reasonably simulating the stress states of structured soil in confined compression.
Numerical Study of Fire Smoke Exhausting in an Eight-lane Dual-Directional Rectangular Tunnel
Authors: Cao Zhengmao , Liu Xiao 
Published: December 2019

Abstract
In order to obtain the smoke exhausting characteristics of large-span cross section rectangular tunnel under lateral exhaust model, fire numerical simulation calculation was conducted by FDS to analyse the influence of different factors on smoke exhausting efficiency, including the layout, area, and spacing of smoke exhausting valves in immersed tunnels, and the applicability of the different tunnel width under the model of lateral exhaust was studied. The results are as follows: The smoke exhausting efficiency of individual exhausting valve decreases with more exhausting valves opened, but the total smoke exhausting efficiency of immersed tunnel increases. When three smoke exhausting valves are arranged in a group, the increase of distance between groups is conducive to smoke exhausting. The Smoke exhausting efficiency of evenly arranged valves is higher than the ones where three valves are in a group. When the number of exhausting valves opened remains the same, the increase of opening area can increase the total smoke exhausting efficiency because the ventilation resistance reduces. In lateral exhaust model, the increase of the width of immersed tunnel can result in the sharp decrease of smoke exhausting efficiency. In a two-lane, uni-directional immersed tunnel, the smoke exhausting efficiency is 93.7%, and that of a four-lane one is only 45.94%. For the poor applicability of lateral exhaust model in the large-span cross section immersed tunnel fire, it is suggested that additional smoke exhausting measures should be adopted to increase the efficiency of smoke exhausting.
Simulation and Experimental Study on Fracture Properties of Lightweight Aggregate Foam Concrete
Authors: Lu Yao , Yang Xiaofa , Xiao Yiqiang 
Published: December 2019

Abstract
Lightweight aggregate foam concrete (LAFC) is a quasi-brittle porous composite material with a large number of holes and micro-cracks in the internal structure, which directly affect the durability and reliability of the building structure. In this study, the extended finite element method (XFEM) is used to build a fracture performance simulation model of three-point bending (3-p-b) for the LAFC. The crack propagation pattern and the loading force variation law are investigated and compared with the fracture test. The results show that the calculated results are in good agreement with the experimental results, which indicate that the XFEM is an effective method to study the fracture properties of the LAFC.
Research on Construction Control Network Technology of Hydropower Project in Steep Mountainous Area
Authors: Guanming Guo , Hui Xie , Ronhui Lin , Feng Hou 
Published: December 2019

Abstract
Due to the limitation of natural geographical conditions, many hydropower hub projects are built in steep mountainous areas, which leads to difficulties in fabric control network, excessive deformation of side length projection length, long error transmission route, and low precision of control network. The accuracy of the entire control network is difficult to control. This paper discusses the establishment of a planar control network using a high-precision dual-frequency GPS receiver instrument. The elevation control network is built using precision leveling plus triangular elevation measurements. It is proved by examples that the control network established by this method can not only ensure the overall accuracy and overall consistency of the control network, but also achieve economic, rapid and efficient effects.
Study on Rear Row Occupant Injury and Seat Optimization Based on C-NCAP Whiplash Test Method
Authors: Yuhao Liu , Haiming Gu , Yongqiang Wu 
Published: December 2019

Abstract
In the field of whiplash test, there was a lack of regulations for evaluating the protective performance of rear seats. Referring to the C-NCAP front seat whiplash test method, this paper conducted the rear seat whiplash tests of 10 different models. The test results were presented. The reasons for the loss of NIC, Upper Fz and Upper My were analyzed. The optimization methods of the headrest were discussed and Suggestions on the optimization of rear seats were put forward.
Research on Energy Consumption and Carbon Emission for Fabricated Composite Plate in Component Production
Authors: Shang Yanwen , Chen Weijiao , Qiao Chunzhen , Hou Lei 
Published: December 2019

Abstract
This article focuses on the component production stage of industrialized buildings. The factors affecting energy consumption and carbon emission during the production of fabricated composite plates in a factory in Jiangsu province are classified, the calculation formula is arranged, and the proportion of total energy consumption and carbon emission is analyzed. Based on the measured data, the distribution of energy consumption and carbon emission during the component production stage of fabricated composite plate is summarized.
Discussion of active safety countermeasures of motorway work zone
Authors: Chai Hua , Yu Hongxi , Tan Yiming , Sun Xiaohong , Zhang Zhengyu , Tang Junjun 
Published: December 2019

Abstract
A series of comparison analyses of work zone configurations, traffic organizations and work management among China and oversea countries are carried out. Taking into consideration of human, vehicles, roads, environment as well as management factors, the causes of traffic accidents in work zone areas are deeply discussed. Based on road safety in work zone areas, a series of active traffic safety improvement countermeasures for both workers and drivers in work zone areas have been introduced from the respects from traditional safety devices and traffic control measures to information and intelligent measures, which will provide inspires for the improvement of work safety and operation safety in work zone areas.
Economic analysis of condensing exhaust air heat recovery fresh air all-in-one unit in Hangzhou area
Authors: Wang Zhiyi , Xia Cui , Wu Yunge 
Published: December 2019

Abstract
Condensing exhaust air heat recovery fresh air all-in-one unit deals fresh air with the heat of building exhaust air as cold or heat source and it has a high efficiency. In this paper, energy consumption of air source heat pump system which introduced condensing exhaust air heat recovery fresh air all-in-one unit is analysed, and equipment’s static and dynamic payback period of investment is calculated in fixed number of year. In a similar system, condensing exhaust air heat recovery fresh air all-in-one unit has very good application prospects.
Study on the strength of the artificial dam of underground reservoir in Wulanmulun mine
Authors: Kong Xiang-song , Fang Jie , Liu Shuai , Wang Shuan , Xu Zhuang-zhuang 
Published: December 2019

Abstract
In recent years, to alleviate the problem of water loss and severe water shortages in the west of China, the concept of coal mine underground reservoir was put forward, and a series of related research were conducted. At present, it has achieved a large number of engineering application, but the structure and the related parameters of the dam still remain to be studied and optimized. In order to explore the influence of the strength of the artificial dam on the stability of the artificial dam, FLAC3D numerical simulation was carried out based on the geological conditions of Wulanmulun mine and the actual working conditions of the artificial dam in its underground reservoir, and the displacement and stress were analyzed respectively. The results show that, with the increase of the dam strength grade, the displacement level of the dam and its cut decreases, but the stress level increases gradually. Overall, the proposed strength grade of the artificial dam should be C25.
Method of rock mass quality classification in ancient underground engineering based on three-parameter interval grey number
Authors: Zha Youcheng , Wei Xueyun , Wang Junjie , Wang Taiming , Zhao Yuqin , Li Luyao , Sun Yali 
Published: December 2019

Abstract
Rock mass quality classification is an important basis for long-term protection and tourism development of ancient underground engineering, however, the existing rock mass quality classification methods are difficult to apply to the special project of ancient underground engineering. Based on the in-depth analysis of the characteristics of ancient underground engineering and the influencing factors of rock mass quality, an evaluation index system for rock mass quality classification of ancient underground engineering is established by taking the long-term tensile strength of rock and the weathering velocity of rock mass as indicators. Secondly, for the evaluation index value has the character of bounded-but-unknown uncertainty, and in order to avoid information loss in interval numbers, the three-parameter interval grey number theory is introduced, based on the concept of three-parameter interval grey number distance measure, a rock mass quality classification calculation model for ancient underground engineering is established. Then, because of the complexity of ancient underground engineering, the idea of group decision-making is introduced, and based on the variation coefficient method, the weight calculation method of evaluation index is established to improve the reliability of weight calculation. Finally, a rock mass quality classification method for ancient underground engineering based on three-parameter interval grey number is established. The method is used to analysis the practical engineering, it shows that the method proposed here is feasible and reasonable.
A study on vegetation community and plant species diversity of Yeli Island, Zhuhai, China
Authors: Liu Hui 
Published: December 2019

Abstract
The vegetation of Yeli Island is of great importance to biological and cultural diversity and to the ecosystem services of Zhuhai. To understand the vegetation ecology, vegetation development process and vegetation structure of Yeli Island, a detailed vegetation investigation was conducted on the Yeli Island through line survey and sampling survey methods. Analysis of woody plant population structure and plant species diversity were conducted. Vegetation on this island was relatively simple since it had been once destroyed. It was mainly covered by artificial Acacia confusa. The upper layer was filled with Acacia confusa and the lower was filled with small trees, shrubs and a few herbs. The dominant population of Acacia confusa was gradually degraded, and a series of newer secondary communities had been formed in the lower layer. The index of biodiversity was low. The vegetation quality was not high. Positive measures should be taken to promote the recovery of this community.
A Study on the Traveling Capability of Large Operating Buses on Mountainous Highways
Authors: Jie Zhang , Yu Zhang , Juwei Wu , Yan Mao 
Published: December 2019

Abstract
This paper analyzes the pass principle and influencing factors of large operating buses. The dynamics model of large operating buses is constructed by Trucksim vehicle dynamics simulation software, and computer simulation is carried out. Finally, through the actual scene test of large operating buses and aerial photography observation by drone, the effectiveness of the method is verified. Results of this paper may have some referential significance for improving the safety ability of large operating buses on mountainous highway and reducing the risk of serious road traffic accidents.
Chloride ion Erosion of Cracked Concrete under Load
Authors: Zhang Yunguo , Han Yue , Zhang Junjun 
Published: December 2019

Abstract
In order to study the effect of load on chloride ion erosion before cracking, cracking critical state and instability failure state, three-point bending beam fracture test was carried out. The specimens were loaded at three loading levels: pre-crack load, crack load and peak load, then chloride ion content in the cracked section of the concrete was measured by borehole sampling method after immersion in 8% sodium chloride solution for 30,60,90 days. The test results show that at the same depth of cracking section, the content of chlorine ion increases with the load level. The chloride ion content with wedge erosion is significantly higher than that without wedge erosion under the same conditions and the increasing trend of chloride ion content under peak load is more significant. The chloride diffusion coefficient decreases with erosion time when the load is less than the initiation load, and chloride ion diffusion coefficient increases slowly with erosion time when load is greater than the initiation load. The stress intensity factor of concrete is positively correlated with chloride ion diffusion coefficient.
Research on the Present Situation and Countermeasures of Carbon Emission in Beijing, Tianjin and Hebei
Authors: Ge Xintong , Cai Linlin , Chang Zhaopo , Wang Xianlei 
Published: December 2019

Abstract
Resource and environmental issues are one of the bottlenecks restricting China’s economic and social development. Adhering to carbon emission reduction and green development is a top priority for the development of Beijing-Tianjin-Hebei. This paper analyzes the data of Beijing-Tianjin-Hebei carbon emissions and its main influencing factors in the past 20 years. On this basis, it sorts out the existing energy-saving and emission-reduction policies and plans of Beijing-Tianjin-Hebei, and clarifies its shortcomings. Furthermore, it proposes countermeasures from five aspects: changing concepts, enacting regulations, green transformation, green finance, and population regulation.
Dynamic evaluation and trend prediction of environmental sustainability in Jiangxi Province based on pollution footprint
Authors: Zhang Qiugen , Wang Hongli 
Published: December 2019

Abstract
Based on the calculation results of pollution footprint, environmental carrying capacity and pollution deficit/surplus in Jiangxi Province from 2004 to 2015, the environmental sustainability was dynamically evaluated in Jiangxi Province from 2004 to 2015 based on a designed environmental sustainability standard with the ratio of pollution deficit/surplus to environmental pollution footprint. It was shown that Jiangxi Province was in the pollution surplus status during 2004 to 2015, which was derived from solid waste pollution surplus and atmospheric pollution surplus, while the water environment has been in pollution deficit. It can be seen that the environmental sustainability of Jiangxi was middle from 2005 to 2007 and strong from 2008 to 2015. Meanwhile, a pollution footprint prediction model (y = -8260.6x
2 + 62750x+ 5×106.) was built to predict the pollution footprint trend of Jiangxi Province in the next five years, and that based on the environmental pollution footprint of Jiangxi Province from 2004 to 2015. It showed that the pollution footprint of Jiangxi Province would drop from 4563473.60 hm2 in 2016 to 3889286.40hm2 in 2020.
The Design and Application of Information Management System Based on IOT for Precast Concrete Segments
Authors: Yu Zhenhuan , Wei Yongbin , Cao Zhen 
Published: December 2019

Abstract
Metro shield tunnels have been widely used in Metro construction. The pre-cast concrete segments of shield tunnels are important prefabricated components in the construction of metro shield tunnels. The quality of segments is directly affected the quality of shield tunnels. In the construction process, a large number of precast concrete segments should be installed and some segments should be formed into rings, so manufacture management, carriage management and constructing of precast segments also directly affect the efficiency and quality of construction. Therefore, it is very important to establish an information management system for precast concrete segment through Internet of Things technology. The system would provide manufacture management (including concealed acceptance, quality inspection, and production-inventory), carriage management (including pre-delivery management, transportation tracking) and construction management (including quality inspection, warehousing management, installation management).
An assessment of recreational value of Color-leaf forest in Bipeng Valley Scenic Spot
Authors: Lu C T , Liu X , Deng Z M , Lin P J 
Published: December 2019

Abstract
This study uses the travel cost method (TCM) and the tourism market demand curve to evaluate the recreational value of the Color-leaf forest resources in Bipeng Valley Scenic Spot at the first time, which contributes to the utilization and management of the Color-leaf forest resources, and also discusses the importance and value of forestry resources. The results show that the research value of the research and development of the Color-leaf forest resources was 1567.48 million Yuan, which is 13 times the actual income of the Bipeng Valley Scenic Spot. It means scenic spot should avoid idle resources, improve its product mix and protect the Color-leaf forest resources to realize the sustainable use of forest resources of arid and semi-arid area of sichuan province.
Research on Intelligent Control System of A/A/O Process for Wastewater Treatment Pilot Based on ASM2D and Fuzzy Model
Authors: Ding Binbin , Zhang Xiaowen , Bo Tao 
Published: December 2019

Abstract
The paper focuses on the design and implementation of intelligent control system for actual wastewater treatment. The objective of this project is to develop an intelligent optimization control system for biological process based on on-line sensing parameters. The control logic of system based on the simplified ASM2d model and fuzzy logic. The system integrates data input and output modules, simulates the biological reaction, and optimizes the control parameters of biological treatment process, such as controlling aeration, dosing and internal reflux ratio. Real-time intelligent optimization control system optimizes the operation effect of wastewater treatment, ensures the water quality to reach the standard and achieves the goal of energy saving and consumption reduction.
Application Analysis of Artificial Environment Control System with Ultra-miniature UAV
Authors: Yu Wenhong , Niu Xiaojie , Wang Kuan 
Published: December 2019

Abstract
In recent years, with the continuous development of building energy-saving technology, people are more aware of adjusting the energy-saving situation of air-conditioning system or heating system from the aspects of indoor thermal comfort and human thermal sensation. The key problem is that the thermal comfort of human body is constantly changing in the process of moving building space. Therefore, this paper puts forward a kind of assembled artificial environment control system with ultra-micro Unmanned aerial vehicle (UAV). It can adjust the thermal comfort of human body locally, reduce the running energy consumption of heating/cooling equipment, and realize building energy saving under the condition that human body can obtain the same or even better thermal comfort environment.
Experimental Research on Indoor Thermal Environment Control and Work Efficiency
Authors: Yu Wenhong , Dong Nana , Jiang Chaowen 
Published: December 2019

Abstract
In order to explore the relationship between work efficiency of office staff and human thermal sensation index PMV, in this paper, the method of combining experimental test and subjective evaluation is adopted to bring seasonal preference into the research scope of work efficiency, and the experimental data are analyzed by quadratic regression. It was found that the highest working efficiency of indoor staff did not appear in the thermal neutral state, but in the preferred environment. Subjects preferred slightly warm indoor environment in heating season and slightly cool indoor environment in transition season. This paper can provide some reference value for the study of the factors affecting the work efficiency of indoor staff.