bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on the Uncertainty of the Calibration Device of PM2.5 Mass Concentration Monitor
Authors: Zou Junchen , Fan Wei , Shi Enjie , Lu Xindong , Zhou Xingang , Li Guoqiang , Fan Zhenxing , Liu Huiyuan , Xu Xueqiong , Liu Xiuxiu , Wang Lin , Liu Wensi , Zhang Ye 
Published: March 2020

Abstract
The fine particles (PM2.5) has become a major air pollution problem in China, and PM2.5 mass concentration monitor was used to measure the concentration of PM2.5, and whether it is accurate or not determines the quality of the atmosphere. In this study, the uncertainty of the calibration device of PM2.5 mass concentration monitor was estimated. By analyzing the source of the uncertainty of calibration device, the analytical method of the uncertainty was determined. It was proved that when the aerosol concentration were 50μg/m3, 200μg/m3 and 500μg/m3, the expanded uncertainty of the calibration device were 0.90%, 0.90% and 10.02% respectively, and it showed that the major influence factor of the uncertainty of the calibration device was the mass concentration indication error.
Heat transfer characteristics of activated coke in the moving bed for sulphur resource recovery
Authors: Wu Gongpeng , Tang Rongsheng , Wang Yiyu , He Yan 
Published: March 2020

Abstract
A counter-flow moving bed and tube heat exchanger was designed and built for the heat transfer process of activated coke desorption, the heat transfer law between particles and tube wall surface in the moving bed was studied. The results show that with the increase of hot air inlet temperature and moving velocity of activated coke particles, the heat transfer coefficient inside the tube largely increases and then remains a small change. As the air velocity increases, the heat transfer coefficient inside the tube also shows increasing trend. In addition, with the increase of air temperature and particles moving velocity, total heat transfer coefficient of the moving bed and heat transfer coefficient outside tube increase first and then decrease. Finally, based on experimental data, the correlation coefficient of heat transfer coefficient outside the tube is obtained.
The Effect of Air pollution on the Hospitalization for AECOPD
Authors: Chen Cai , Li Xiyuan , Meng Xiangwei , Ma Zhixiang , Li Wei , Ma Dedong 
Published: March 2020

Abstract
More evidences showed that there was a relationship between air pollution and hospitalization of acute exacerbation of chronic obstructive pulmonary disease. This paper aimed to investigate the effect of air pollution (fine particulate matter, inhalable particle, sulfur dioxide, nitrogen dioxide and ozone) on the hospitalization for acute exacerbation of chronic obstructive pulmonary disease. Thus, generalized additive model was built to evaluate the impact of air pollution on people’s respiratory system. After controlling for temperature and relative humidity, the increase in average daily concentrations of PM2.5, PM10 and O3 would aggravate the risk of admission of patients with acute exacerbation of chronic obstructive pulmonary disease, and the results were statistically significant.
Effect of Wet Scrubbing Oxidation Denitration Technology Combined with Ultraviolet Online Irradiation on the Efficiency of Desulfurization and Denitrification of Ship Exhaust Gas
Authors: Chen Peng 
Published: March 2020

Abstract
In order to alleviate the air pollution caused by nitrogen and sulfur oxides discharged from ships, the efficient method of deoxidization and desulfurization of marine diesel engine exhaust gas has been explored. In this study, at present, the mainstream technology of ship exhaust gas removal at home and abroad, wet scrubbing oxidation denitration technology is taken as the research object. Ultraviolet (UV) online irradiation is introduced into the process of wet scrubbing oxidation denitration of NaClO2 solution. The effects of different parameters, such as the concentration of NaClO2, the temperature of washing solution, the concentration of O2 and SO2, on the removal of No are studied. The reaction mechanism is further analyzed. The results show that photochemical reaction will take place between UV online irradiation and NaClO2 solution, resulting in a large number of active radicals with strong oxidation, which can obviously enhance the effect of No removal by wet scrubbing of NaClO2 solution. It can be seen that the wet scrubbing oxidation denitration technology combined with UV online irradiation can greatly improve the efficiency of desulfurization and denitrification of ship's exhaust gas. It is an efficient method of deoxidization and desulfurization of ship's diesel engine exhaust gas, which is of great help to alleviate exhaust gas pollution.
Study on the Scattering Properties of Cylinders in Suspensions Containing Sediment Particles
Authors: Yin Linli , Han Qingbang 
Published: March 2020

Abstract
A method is presented that combining the Mcclements suspension model with the cylindrical model to solve the complexity of calculating the scattered acoustic pressure around the cylinder, when suspended particles are contained in the water. The scattered acoustic pressure of an infinitely long cylinder in water is derived based on the boundary conditions. Then, the wave number of the particle-containing suspension is calculated by the Mcclements suspension model, which is combined with the scattered acoustic pressure of an infinitely long rigid cylinder in water. The scattered acoustic pressure of an infinitely long rigid cylinder in suspension is obtained. The results show that the content of sediment particles has a greater impact on the distribution of scattered acoustic pressure. The scattered acoustic pressure is more directional with the increase of the content of sand particles, laying a foundation for further research on other target objects in suspension.
Treatment process of rural domestic sewage based on small purification tank technology
Authors: Bi Xiaoqing , Guo Lijuan 
Published: March 2020

Abstract
With the continuous development of our country's economy, the living standard in rural areas has been greatly improved, rural water consumption has also increased significantly, especially in recent years, the popularity of rural tap water, improve the rural water availability, rural sewage has also increased significantly. As China's rural sewage treatment technology and facilities are generally backward, some rural areas even have no sewage treatment facilities, a large number of living directly into the surface or rivers. According to the characteristics and analysis of the discharge of rural domestic sewage, this paper puts forward the method of purifying rural domestic sewage with the technology of tank.
Research on Low Altitude Illumination Configuration Technology of Highway Tunnel
Authors: Bei Dengrong , Liu Peng , Ma Fei , Xia Yangyuyu 
Published: March 2020

Abstract
In view of the problem of light efficiency utilization in low altitude illumination in tunnels, it is proposed in this paper to improve the lighting benefits by optimizing the light configuration. Combinational analysis of such parameters as light height, elevation angle and spacing in low altitude illumination is performed in this research by Dialux optical simulation software. The average road surface luminance, overall uniformity of road surface luminance and longitudinal uniformity of road surface luminance are taken as key evaluation indicators. The study shows that the optimal height, elevation angle and spacing of low altitude illumination are 3 meters, 40° and 1 meter respectively. The overall uniformity of road surface luminance of low altitude illumination can reach 0.97, the longitudinal uniformity of road surface luminance can reach up to 1.0. The luminous flux per meter is equal in the longitudinal direction of the tunnel. The average road surface luminance is affected by the light arrangement spacing to a very small extent, and the longitudinal uniformity of road surface luminance is affected by the height and elevation angle of the light very slightly.
Review on Tunnel Concrete Invert NDT Methods
Authors: Qiuzhuo Liu , Yunteng Zhou 
Published: March 2020

Abstract
Tunnel concrete invert is very important to the stability of the entire tunnel structure. However, invert’s quality is usually insufficient due to various reasons. Traditional approaches to detecting tunnel concrete invert focus on inefficient coring. The results of detection often cannot reflect all realities of the invert and concrete fill layer. These approaches are short of meeting current detection requirements for concrete invert. In order to increase the effectiveness and accuracy of invert test this paper summarizes technical features of GPR method and Rayleigh wave method according to concrete structure NDT and tunnel invert test technologies at home and abroad. The results show: the GPR method is simple and efficient and capable of qualitative test of tunnel invert, though with a trade-off between detection depth and accuracy; the Rayleigh wave method provides high accuracy and the qualitative test ability for tunnel invert thickness and unconsolidated fill, though inefficient due to a lack of pertinent equipment.
Experimental Investigate on Pulling out of Anchor Based on Fiber Bragg Grating Monitoring
Authors: Duan Jun , Mou Chunhai , Wang Zhongwei 
Published: March 2020

Abstract
The stability of the anchor plays an important role in slope engineering, mining engineering and construction engineering. Based on the Fiber Bragg Grating (FBG) sensor detection technology, this paper carries out the pulling out the test of the anchor with different tensile strengths. The results show that the center wavelength of the FBG has a good mathematical relationship with its axial strain, and the wavelength change data can be processed into the strain result of the FBG sensor to characterize the strain deformation and stability of the anchor further. What’s more, the measured data from the FBG sensor agrees with the load of the test, and the accuracy of the FBG sensor monitoring data on the anchor is varified.
Study on Slope Stability of Baoshi Expressway Based on the Analytic Hierarchy Process
Authors: Yang Zhihua , Wang Zhongwei 
Published: March 2020

Abstract
Combining with the actual situation of section K13+165 in Baoshi Expressway, the hierarchical structure model of the slope stability is established based on the analytic hierarchy process (AHP) in operational research. Fourteen factors, which affected the slope stability, are analysed, quantitatively calculated and ranked. The consistency test was carried out. On this basis, the influence weights of each factor are sorted, and the main influencing factors of the slope stability are found out. The research can provide a basis for the maintenance and treatment of Baoshi expressway.
Design and Calculation Method for Composite Foundation Using Large-diameter Rigid Piles in Pebble Bearing Soil
Authors: Zhang Wenhan , Li Feng , Cheng Lijuan , Xu Jianxiao 
Published: March 2020

Abstract
In the composite foundation using rigid piles, large pile-soil stress ratio often results in insufficient exploitation of bearing capacity of soil among piles. The rigid piles bear most of the vertical loads which makes the stress mechanism similar to that of pile foundation and fails to save cost. Based on the test and study of pile shaft resistance and tip resistance in the composite foundation using large-diameter rigid piles in pebble bearing soil and the stress monitoring of pile top and soil among piles, the pattern of variation in pile-soil stress ratio of composite foundation using large-diameter rigid piles was achieved. Furthermore, according to field test, use of cushion would lower the stress in rigid piles and exert bearing capacity of soil among piles which leaded to higher bearing capacity of composite foundation and smaller differential settlement. In contrast to “Technical Code for Ground Treatment of Buildings” (JGJ79-2012), a new design and calculation method for composite foundation using large-diameter rigid piles in pebble bearing soil was proposed based on the results from field test, numerical simulation and theoretical analysis. This improved and practical method has fully considered the potential bearing capacity of soil among piles and has been verified through practical engineering cases.
Development of an automatic monitoring system for ground settlement induced by shield tunnelling
Authors: Wan Shifu , Huang Qiming , Zhao Hailin , Qi Xingxin , Liu Yi , Qiu Wenge 
Published: March 2020

Abstract
During the construction of the modern subway, it is often the case that subway tunnel construction is close to existing buildings, causing the deformation of existing buildings. In order to minimize the impact of new line construction, real-time monitoring and feedback warning of building deformations are required. This paper is based on the current mature automated monitoring data acquisition system. A comprehensive monitoring management system is developed, which includes engineering information management, monitoring equipment management, monitoring data reception, monitoring data analysis and processing, early warning information release as well as monitoring report automatic output. The developed automatic monitoring system was applied to the monitoring of the construction of Chengdu Metro Line 5, completed the automatic monitoring and real-time data processing and early warning of the underpass process. The operation safety of the existing lines was guaranteed. In the future, this system will also be extended to other tunnel monitoring, gradually forming a comprehensive tunnel construction monitoring and management system.
Quantitative analysis and calculation of traffic social cost during the construction of open-cut subway station
Authors: Liao Jixuan , Guo Chun , Xu Yumin , Zhang Jiapeng , Yang Kun 
Published: March 2020

Abstract
With the rapid development of rail transit, traffic problems caused by open-cut metro construction have become increasingly prominent. In order to quantify the negative impact of subway station construction, taking a metro stations under construction in Chengdu as example, collected relevant data such as traffic flow, congestion time, speed during congestion and noise decibel value at metro construction intersection by field test. Through quantitative calculation, the negative effects of open-cut construction are monetized from four aspects: extra fuel cost, time delay cost, environmental pollution cost and fatigue cost. It is found that the social cost is as high as 20 million yuan per year. Based on the calculation results and the actual traffic situation in Chengdu, the corresponding measures to reduce social costs are put forward.
Optimization of Gas Drilling in Pre - pumping Coal Seam of Gas Tunnel
Authors: Wang Yuqi 
Published: March 2020

Abstract
In order to optimize the gas drilling in pre-pumping coal seam and strengthen the gas emission effect, This paper uses Chenggui high-speed railway Baiyanglin tunnel as the research object. The FLUENT numerical simulation software is used to simulate the change of coal seam gas pressure during the process of gas emission and the influencing factors of the effect of gas emission. According to the numerical simulation results, the parameters including hole spacing, hole depth and aperture are optimized. The results show that the recommended diameter of the pre-emission gas is 75 ∼ 100mm, the drilling depth is 1.5 ∼ 2.5m, and the hole spacing is 2m.
Numerical simulation study on the width of coal pillar in dynamic pressure roadway
Authors: Ren Peiliang , Li Zongze , Guo Xiangyin 
Published: March 2020

Abstract
The deep coal mine roadway is easy to deform and destroy under the high ground stress. At the same time, it is disturbed by the mining stress of the adjacent working face. At present, the scope and size of the influence of stope mining are mainly studied at home and abroad. However, there is not enough understanding of the propagation law of the working face support pressure and the surrounding rock control of the deep well dynamic pressure roadway, and there is no in-depth study of the influence of the pillar width on the stability of the roadway. Therefore, this paper comprehensively uses the methods of field investigation and FLAC3D numerical simulation to study the deformation and stress distribution of surrounding rock under the influence of mining. By using FLAC3D numerical simulation software, this paper studies the distribution of surrounding rock stress and the law of surrounding rock deformation under different pillar width in the mining process of adjacent working faces. Studying conclude that when the pillar width is 80m, the roadway is less affected by mining.
Deformation Control Standard of Utility Tunnel Based on Crack Control Standard
Authors: Cai Yanbiao , Du Zipeng , Zhang Gen , Feng Jiajia 
Published: March 2020

Abstract
The construction of underground utility tunnel is being carried out on a large scale in China, however there is no corresponding control standard for the structural deformation of utility tunnel, so it is very necessary to establish the deformation standard of utility tunnel. In this paper, the maximum longitudinal bending moment of utility tunnel and the maximum stress of reinforcement controlled by cracks were used to establish the longitudinal deformation standard of utility tunnel structure. In addition, numerical simulation was used to analyze the deformation characteristics of underground composite utility tunnel under different section sizes and soils. And simulation results indicate that the crack reached its maximum of 0.2mm when maximum deformation curvature of utility tunnel was 2.12025*10−5.
Research on Fault Diagnosis Method of Tunnel Inspection Robot Based on T−S Fuzzy FTA
Authors: Li Wen-feng , Ding Hao , Li Ke , Liu Qiu-zhuo , Jiang Xing-hong 
Published: March 2020

Abstract
Aiming at the intelligent fault diagnosis of tunnel inspection robot, the T-S fuzzy fault tree method was proposed to build the intelligent diagnosis system. Taking positioning system of the robot as an example, the T-S fuzzy FTA model of the system was established. And the T-S importance of each component and fault checking sequence were calculated using the T-S fuzzy gate rule. The example analysis results show that, the method improves the accuracy and practicability of fault diagnosis of the robot system.
Study on Prediction of Gas Burst Hazard Before Advancing a Tunnel Through Coal Seam
Authors: Hu Xuebing , Cheng Liang 
Published: March 2020

Abstract
This paper discusses how to predict burst hazard when advancing a tunnel through a gassy coal seam in order to prevent gas burst disaster during tunnel excavation. It covers prediction of burst hazard for Huayan Tunnel of Chengdu-Chongqing Expressway in the city of Chongqing before its left tube is advanced through a gassy coal seam at ZK3+200. The prediction result is reliable and has ensured the safety and stability of the Huayan Tunnel while it is advanced through the gassy coal seam.
Safety Analysis of the Secondary Lining Structure of Existing Tunnel with Cracks
Authors: Cai Shuang , Ding Hao 
Published: March 2020

Abstract
Because cracking of the secondary lining is one of the most common diseases in road tunnel, it is of great practical significance and theoretical value to analysis and research on the safety of lining structure of existing tunnel with cracks. Based on crack models of fracture mechanics, the calculation method of safety evaluation for the secondary lining structure of existing tunnel with cracks was discussed through numerical analysis. The bearing capacity of non - destructive lining and cracked lining was analyzed and compared by model tests. Results showed: (1) the finite element method of fracture mechanics could be used to evaluate the safety of the secondary lining structure of existing tunnel with cracks. (2) The size order of the required load when the cracks occurred in the different parts; The arch foot is smaller than the vault; the vault is smaller than the haunch; the haunch is smaller than the invert. (3) When the crack was located at the crown and arch foot, it had the most significant influence on the safety of lining structure. (4) The bearing capacity of the lining structure declined because of cracks, and it decreased by 37.5% when there was longitudinal crack at the bottom of the inverted arch of tunnel.
Study on the Influence of Micro Parameters of Numeric Model Using Particle Flow Code on Macroscopic Mechanical Properties in Cobble Stratum
Authors: Fang Lin , Hu Peng , Wu Mengjun , Cao Peng , Chen Shouchao 
Published: March 2020

Abstract
The widely distributed cobble in the subsurface brings about lots of technical problems to underground projects. Based on the physical and mechanical characteristics of the pebble layer, PFC particle flow software was used to establish a triaxial numerical test model. Considering multifarious situations, triaxial numerical tests were carried out with different mesoscopic parameters, and the influence of mesoscopic parameters of different types of sand pebbles on macroscopic mechanical properties was analyzed. Studying the influence of both contact stiffness and friction coefficient on the macroscopic response of pebble, the conclusions could provide references for the numerical simulation of cobble tunnel excavation.
Simulation study on rock slope reinforced by anti-slide pile: a case study
Authors: Liu ZhongShuai , Xu Feng , Fu Yu , Kang Hong 
Published: March 2020

Abstract
For the collapse of bedding rock slope in Yuqian Expressway, by using simulation software FLAC-3D this paper established simulation models bedding rock slope before and after reinforced by combined supporting, i.e., “slide-resistant pile+ diagonal bracing wall+ anchor cable”, and collected parameters such as deformation and shear stress through three monitory points established. As simulation results compared with field monitoring data, bedding rock slope before reinforced was unstable, belonging pull-type failure model, and this failure model was sudden; the displacement contour map after the slope was reinforced by combined supporting showed that there existed one bigger shear zone in the rock interface, and the shear zone was disappeared after this slope was reinforced, then maximum deformation was decreased; the displacement vector map of slope showed that this slope slipped along the rock interface before it was reinforced, but the whole slope slid along one arc after it was reinforced; shear stress concentration phenomenon in the rock interface was disappeared obviously after this slope was reinforced. As monitoring deformation compared with simulation deformation, slope deformation was less; and the slope was stable; the reinforcement measure of combined supporting has the better retaining effects.
Study on calculation method of new corrugated steel reinforcement structure of highway tunnel
Authors: Yu Chengshuo , Ding Wenqi , Wu Tianxiang , Zhang Qingzhao 
Published: March 2020

Abstract
Corrugated steel, a new structure, shows great advantages in many fields, however, it is rarely used in the reinforcement of highway tunnels. Besides, corresponding design method and mechanical properties are still not clear yet. In this study, a full-scale test is carried out to explore the calculation method of corrugated steel as a new reinforcement structure. Combining with numerical simulation and theoretical calculation, the load-deflection law of corrugated steel is revealed, which has a two-stage stiffness characteristic (anti-backlash stage and elastic stage). Equivalent stiffness coefficient is proposed to establish a simplified calculation method of the equivalent stiffness of corrugated steel. And RDP (Ratio of Depth to Pitch) is the main factor affecting the equivalent stiffness coefficient.