bluuebunny/crossref_metadata_2025_split huggingface dataset:
Experimental Study on the Characteristics of Acoustic Emission Source of Rock under Uniaxial Compression
Authors: Song Zhaoyang 
Published: June 2021

Abstract
One of the main research problems in acoustic emission (AE) monitoring technology is to identify the source of the acoustic emission. Processing the acoustic emission signal is the only way to solve this problem, and then to achieve the purpose of identifying the material destruction mode. Using acoustic emission monitoring technology, the acoustic emission of granite under uniaxial compression was monitored and analyzed, and the coupling characteristics between the acoustic emission signal parameters of granite under different loading rates were obtained. The results show that during the process of rock shear failure, the peak intensity of the rock, the peak value of the absolute energy of acoustic emission, the cumulative amount of acoustic emission and the loading rate showed a positive correlation. The correlation diagram of the AE ringing count and the duration shows a triangular distribution, and as the rock loading rate decreases, the angle of the triangle top angle of the correlation diagram increases. The distribution relationship between the absolute energy of AE and the duration can be fitted using a unary quadratic function, and as the loading rate decreases, the opening of the fitting curve gradually increases, and the width of the correlation graph gradually decreases. The correlation graph of absolute energy and amplitude of AE is linearly distributed, and as the loading rate decreases, the slope of the fitted line of absolute energy and amplitude of AE gradually decreases, and the width of the linear channel of the correlation graph decreases. It is found that there is a good regularity between the correlation graphs of different parameters of the acoustic emission of the rock during the uniaxial compression failure process, which is an effective method to identify the characteristics of the source of the acoustic emission. Therefore, establishing the correspondence between the characteristics of the AE source and the loading conditions will promote the development of acoustic emission technology in the monitoring of the stability of the surrounding rock of underground projects.
Construction optimization of PBA of Subway station tunnel excavation and its cross section in loess area
Authors: Chen Qingrui , Zheng Xuanrong , Yin Zhanbo , Shang Xuexuan , Lei Qi , Yang Kang , Qi Jiahui , Cheng Weikang 
Published: June 2021

Abstract
This paper takes the project of Hejiaying Station of Xi’an Subway Line 2 as the background for the study. The dynamic numerical simulation of the construction process of the station by the PBA method is carried out using the 3D finite element method. The changes of surface settlement, vault settlement, headroom convergence and structural stresses are studied up to the intersection of the guide tunnel and large section duct. The research results show that: the construction of the upper guide hole of the station has a small effect on the deformation and internal force of the initial support structure of the duct. The construction of the lower pilot hole will increase the deformation and internal force of the initial support structure of the duct, especially the construction of the lower 2 pilot holes and the lower 3 pilot holes will lead to a significant increase in the deformation and internal force of the initial support structure of the duct. Therefore, it is necessary to make a 10m reservation for the lower guide hole of the main line, and to grout the cross section of the lower guide hole to ensure the safe construction of the cross section.
Safety risk prediction of cantilever construction of sanduizi super large bridge on Jinshajiang River Based on basic Bayes model
Authors: Yang Yan , Wen Chao 
Published: June 2021

Abstract
In order to better control the safety risk of bridge construction, this paper takes the cantilever construction of sanduizi super large bridge on Jinshajiang River as an example, and establishes the safety risk prediction model by using Bayes principle. Firstly, it constructs the Bayes relationship model of construction environmental factors and cantilever construction key process risk factors and events, and then uses Bayes theory to analyze the probability of risk events in various cases. Finally, the overall safety risk of cantilever construction, the influence degree of various influencing factors on the overall safety risk and the most unfavorable risk combination are studied. Through the application of examples, the results show that on the basis of theoretical research, targeted safety control measures are taken, and the safety risk is effectively controlled.
The Analysis of Characteristic Coastal Landscape Design
Authors: Yu Hang , Qin Yang 
Published: June 2021

Abstract
With the development of social economy and the progress of science and technology, nowadays, coastal landscape design has attracted more and more attention from all walks of life. The focuses of paper are that how to combine natural conditions to create beautiful coastal space environment, solve coastal ecological problems, innovate coastal regional characteristics and show coastal culture. Through expounding the principles of coastal landscape design, analyzing the key points of coastal landscape design, and combining with the coastal design cases of Tianjin and Xiamen, this paper further studies the key points of coastal landscape design and characteristic expression channels, and guides and promotes the construction and development of coastal areas in the landscape field from a higher level.
Measurement and Comparison Study of Road Roughness Conditions by using Two Compact Road Profiler for Evaluating Ride Quality
Authors: Abulizi Nueraihemaitijiang , Wei Mao , Maimaiti Rehanguli , Tomiyama Kazuya 
Published: June 2021

Abstract
More recently, it is strongly required that road management involves a wide range of topics over the world and it must be considered from a perspective of customer-oriented levels of service and road administrators are requested to present a visual map of road network in terms of road network monitoring among others. To fulfill these requirements, firstly, this paper introduces new topics, which is related to two Compact Road Profiler (CRP) to monitor the road roughness conditions including localized distresses. In addition, we analyze road profile data considering two wheel paths by the survey vehicle, known as inner and outer wheel paths, and using a sophisticated driving simulator (DS) to evaluate ride quality conditions based on Power Spectrum Density (PSD) function to identify the sensitive range of ride quality. Finally, we calculate the Root Mean Square (R.M.S) and Crest Factor (CF) using vertical acceleration data of the passenger seat in DS. Consequently, it is shown that advanced evaluation of the ride quality under two wheel paths is performed. As regards standard for ride evaluation, ISO 2631 standard is adopted.
Design and Analysis of a Linear Conveying System
Authors: Liangfa Li 
Published: June 2021

Abstract
Based on the transportation demand of medium- and short-distance materials, this paper proposed a method to design and analyze a conveyor system, which has simple structure, low cost and flexible drive. A simplified system model was established and the design method of the system was introduced. Geometric equations, velocity and acceleration calculation formulas were obtained through mathematical analysis calculations. The simulation model was established through ADAMS, so as to obtain the kinematics law and verify the design accuracy. The organization and its design analysis process can provide references for the design of similar products.
Design of Tianjin Baimiao Passenger Station
Authors: Wang Ning 
Published: June 2021

Abstract
The purpose of this design is to carry on the reconstruction planning to the present Baimiao passenger station, in order to improve its passenger flow and service quality, improve the residents’ travel experience. In this paper, the passenger volume of Tianjin from 2010 to 2019 is taken as the research object, and the passenger volume of Baimiao Passenger Station is predicted by exponential smoothing method from 2021 to 2028. Then, the passenger volume of Baimiao Passenger Station is predicted according to the proportion of total passenger volume in Tianjin. Then make reasonable planning for Baimiao passenger station.. Finally, some constructive suggestions are put forward.
Route Optimization of AGVs with an Improved Fishbone Warehouse Layout
Authors: Wanying Zhu , Xiaoqing Wei , Ruofei Ma , lin Diao , Jianchen Zhang 
Published: June 2021

Abstract
AGV (Automated Guided Vehicles) as one of the most intelligent technologies is widely applied in the warehousing operations with a high speed development in the intelligent logistic fields. Automated material warehousing systems have proved that they would improve the effectiveness of material loading, unloading and handling company as well as reducing the labor cost and strengthening the working safety. AGV, as one part of the automated material warehousing systems, preforms powerful actions in the full chain of cargo handling in warehouse. Effective planning of AGV running route is the key for improving the efficiency of material loading and unloading. Based on this, this article aims to improve warehouse operation efficiency and control capabilities with an innovated fishbone layout warehouse design. Firstly, the improved fishbone warehouse layout is designed by an embedded central corridor compared to classical layout. Then, AGV route optimization model is proposed, which is transformed into secondary allocation model for getting a better and more optimal solution. Finally, the genetic algorithm is used to verify the feasibility of the proposed model. The results show that the proposed route optimization method for AGV can effectively reduce the distance among materials shelf and loading point according to the improved fishbone layout warehouse. Under the same circumstances, the reduction of total distance of AGV can reach to 12.8% compared to the benchmark example.
Zhoushan City Mainland Water Diversion Phase III Project Key Technologies of Cross-sea Pipeline Laying Construction
Authors: Jin Qiwu , Huang Wentao , Huang Yicheng , Wang Xin 
Published: June 2021

Abstract
This paper introduces the cross-sea water transmission pipeline project from Zhenhai to Mamu section of Zhoushan Continental Water Diversion Project Phase III, and summarizes the towing method of the nearshore section of the pipeline laying, the S-Lay, Post-trenching technology and concrete chain row installation construction techniques. Through the summary of the paper, it is expected to provide help for the construction of the sea bottom pipeline for island water supply in the future.
Analysis of physical properties of middle-deep reservoirs in the east of Jizhong Depression
Authors: Li Yuqiong , He Siqi , Zhang Fengming , Wang Ting , Cai Wenhui 
Published: June 2021

Abstract
The Jizhong Depression is one of the hot spots for oil and gas exploration in North China. As the Jizhong Depression has the largest area and richest oil and gas resources, the Raoyang Depression has good prospects for exploration. This paper takes the middle-deep reservoirs of the Shahejie Formation in the Raoyang Depression as the research object. Aiming at the problem of the unclear characteristics of the middle-deep reservoirs in the Raoyang Depression, using core description, thin section identification, and cathodoluminescence technology, the physical properties of the middle-deep reservoirs in Shahejie are clarified. The following points of understanding have been obtained: The rock types of Shahejie Formation in Raoyang area are mainly feldspar sandstone and detrital feldspar, followed by feldspar detrital sandstone and feldspar quartz sandstone. The main mineral content of different structural belts is different. The quartz content in Suning and Maxi areas is higher than that in Liuchu and Dawangzhuang areas. The feldspar content in Liuchu and Dawangzhuang areas is higher than that in Suning, Maxi and Liuxi areas. The Maxi area has the highest lithic content. There are 7 types of pores, including intergranular pores, intragranular pores, granular dissolved pores, mold pores, intergranular dissolved pores, intragranular dissolved pores, and intergranular pores. The porosity in Raoyang area is between 0.85% and 35.26 % with the average value of 12.05%. The permeability is 0.01mD-1312mD, and the average value is 12.75mD. It belongs to low porosity-low permeability reservoirs. Finally, combined with sedimentary facies characteristics and actual drilling and logging data, the reservoir division of the study area is completed, and 10 favorable areas are proposed. The research results provide a reference for the next step in the study of the physical characteristics of the middle and deep reservoirs in the eastern part of the Jizhong Depression.
Study on the Photocatalytic Degradation Rate of Indoor Formaldehyde with Nano-TiO2 Coating
Authors: Yue Yihang , Feng Bo , Du Chun , Wang Yuanhao , Shifeng  
Published: June 2021

Abstract
With the improvement of people’s living standard, diverse home decoration has become popular. However, it results in indoor hazardous gas emission, especially formaldehyde, bringing harm to people’s health. To address this issue, one positive strategy is to remove the hazardous volatile organic compounds through environment friendly nanomaterials. Nano-TiO2 is such a kind of semiconductor material, which can decompose the volatile pollutants via photocatalytic process. In this work, the removal of indoor volatile pollutants by applying home-made nano-TiO2 was studied. The dependence of treatment efficiency of indoor formaldehyde on varying flow rate, coating times, humidity and temperature was systematically investigated. As a result, the highest purification efficiency was achieved when it was coated three times at the relative humidity of 50%. The faster the flow rate, the higher the air purification efficiency. Temperature is also an important factor affecting degradation efficiency, and the degradation has peaked at 22°C. This study demonstrates the effective removal of indoor volatile organic compounds via green nano-TiO2 coating at low cost, and paves way for nanomaterials in applications of indoor environment improvement.
Effect of surface morphology on the mesoporous silicon modified nanofiltration membranes for high rejection performance
Authors: Ding Ying , Liu Dong 
Published: June 2021

Abstract
A new method to prepare composite nanofiltration membrane directly and efficiently by controlling the pore structure and surface morphology of the membrane is proposed in this paper. The fabrication of mesoporous silicon modified polysulfone blend membranes is via a phase inversion method. The structural morphology, surface functional group analysis, elemental analysis, hydrophilicity, chargeability, and nitrogen pollutant (ammonia nitrogen, nitrate nitrogen, total nitrogen) rejection properties of the modified membranes were found to be dependent on the amount of mesoporous silicon incorporated. The combination of the mesoporous silicon framework layer can not only effectively improve the surface structure of the modified membrane with a narrow pore size distribution but also increase the rejection of nitrogen pollutant compared with the pure NF membranes. The mesoporous material can absorb and storage the nitrogenous solution to facilitate the following interfacial polymerization, as well as induce the change of pore radius and surface structure. Compared to those pure NF composite membranes, the modified blend membranes exhibit increased water permeation flux as high as 29.09 L m−2 h−1 at 0.2 MPa. The results show that the optimum doping amount of mesoporous silicon is in the range of 0.5%-1.0%. Characterization studies demonstrated that the addition of the mesoporous silicon leads to decreased membrane pore size. Then, due to the enhanced hydrophilicity of carboxyl and hydroxyl groups on the surface, the electrostatic repulsion between the functional groups and nitrogen pollutant molecules in the membrane results in the enhanced rejection of nitrogen pollutants.
Study on Resistance Coefficient Monitoring of Shallow Hydraulic Tunnel
Authors: Hong-hu Yuan , Shi-peng Haung , Yu Wang 
Published: June 2021

Abstract
The acquisition of elastic resistance coefficient is crucial for the design of shallow hydraulic tunnel. In this paper, the resistance coefficient of the tunnel in the test section of the South Main Canal Project is monitored and analyzed. Considering the actual load mode of the tunnel lining, the load value acting on the lining is measured by the measurement instrument on the spot, and the elastic resistance acting on the tunnel lining is obtained. The elastic resistance coefficient acting on the tunnel lining is obtained through the deformation around the tunnel on the measuring side. The research conclusions and methods can provide reference for the support design of shallow hydraulic tunnel in loose soil layer.
The development overview of wheel-coupler type formwork support
Authors: Li Hang , Jia Shilong , Zhou Fang , Zhao Lei , Su Yanming , Liang Bo 
Published: June 2021

Abstract
As a new type of formwork support, the wheel-coupler type formwork support has been widely used in China, but its research is not comprehensive enough. Therefore, this article introduces the structural characteristics of the wheel-coupler type formwork support and summarizes the current research status. The mechanical properties of the joints are analyzed by finite element analysis, and the analysis results are compared with the disk lock steel tubular scaffold, so as to promote the popularize and use of the wheel-coupler type formwork support.
Development of a Dynamic Information System for Safety Management of Construction Workers Based on IoT and BIM Tools
Authors: Zhang Tiantian , Hao Shengyue 
Published: June 2021

Abstract
In this paper, according to the current situation of safety management of construction workers, BIM and the Internet of Things are jointly applied to the safety management of construction workers, and a safety management system for construction workers is constructed. Solutions are put forward for accident-prone areas, construction personnel’s physical condition, construction personnel’s operation and safety training, hoping to fundamentally and effectively reduce construction personnel safety accidents.
Study on flow field characteristics of undulating member bar in engineering
Authors: Zhao Ruochen , Zhao Meng , Liu Zhen , Jia Tiemei , Kong Fanguang 
Published: June 2021

Abstract
Aiming at the undulating member bar, three kinds of wavelength models are established. The flow characteristics of the undulating member bar with space angle of attack are analyzed by the large eddy simulation method under high Reynolds number, its velocity and pressure distribution with different wavelengths are studied, and the time and frequency domain characteristics of circumferential pressure coefficient, resistance and lift are discussed. The results suggest that the greater the fluctuation of the outer surface of the wave member, the greater the time difference between the maximum and minimum cross-sections; the greater the surface inclination, the greater the change in surface pressure. While the smaller the wavelength, the larger the amplitude of the rod resistance coefficient and the range of the main peak; the larger the wavelength, the slower the attenuation rate of the amplitude peak of the rod resistance and lift coefficient. Combined with the characteristics of the flow field, when the incoming flow has a space angle of attack, the wave cylinder of can achieve a better effect of drag reduction and vibration reduction. Finally, the research results provide important significance and value for the research and application of the flow characteristics of undulating member bar.
Numerical Simulation of Shell and Tube Heat Exchanger Based on Fluent
Authors: Luo Xinyu , Chen Bo , Min Min , Jin Mei , Liu Hongjiao 
Published: June 2021

Abstract
In this paper, the classical shell-and-tube heat exchanger is taken as the research object, and the numerical simulation of the heat exchanger is carried out by using Fluent software. The nephogram of temperature field, velocity field and pressure field on the shell side of the fixed tube-and-plate heat exchanger with different baffle spacing is obtained. The variation law of fluid flow and heat transfer coefficient on the shell side of the heat exchanger with different baffle spacing is analyzed. the ratio of convective heat transfer coefficient ᵅ to the third power of pressure drop ∆pis used as the comprehensive performance evaluation index of the heat exchanger, which has a certain reference for evaluating the comprehensive performance of heat exchanger under different baffle spacing.
High-altitude fall prevention method and device for power transmission line
Authors: Wang Zhigang , Ou Yuexiong , Li Hui , Zeng Wenyuan , Gao Quanzhe , Zou Yu , Li Peng 
Published: June 2021

Abstract
This paper analyzes the structure of transmission line towers and live working conditions, and draws conclusions on the importance and necessity of studying the methods and devices of high-altitude fall prevention for transmission lines. Combining the actual situation of the pole and tower, in view of the poor manufacturing technology of the pole and tower anti-falling track, the size of the anti-dropping device and the track are not matched, and the connection point is misplaced, a new type of adjustable anti-dropping device is developed to address the cross-arm movement of personnel during live work. The alternate use of backup protection ropes and seat belts is cumbersome. An alternative safety rope was developed. Aiming at the transmission line towers without anti-falling tracks, a drone-based high-altitude fall prevention method was developed, and an anti-fall manipulator for high-altitude operations.
Thermal performance of a print circuit heat exchanger in a steam-air test facility
Authors: Zhang Shicheng , Ye Jing , Jin Hongqifei , Yan Xiong , Chi Haomiao , Luan Huibao , Tan Ling 
Published: June 2021

Abstract
Printed circuit plate heat exchanger (PCHE) is a new type of microchannel heat exchanger with high compactness and excellent heat transfer performance. In this study, the performance of a 100×100×200 mm PCHE was evaluated. The thermal hydraulic performance of the PCHE was experimentally investigated in a steam-air heat exchange test setup. Experiments were carried out in the region of 1000<Re<3500. Pressure and temperature at the inlet and outlet of the PCHE were measured during the experiment for both the hot steam and the cold air side. Global Nusselt number correlations were then calculated and regressed from the experimental data. In addition, a full-scaled three-dimensional numerical simulation was performed using CFD method to make more discussion on the friction factors. With these correlations, PCHEs can be further optimized and designed.
Study on the Transformation of I− in Fe2+ Activated PMS System
Authors: Liu Qiang , Miao Jiaqi 
Published: June 2021

Abstract
In order to solve the problem of more and more iodinated by-products in water, the advanced oxidation system of peroxymonosulfate (PMS) activated by ferrous (Fe2+) was used to study the transformation process and principle of iodine ion (I−) as the initial target under different influencing factors in this system. The results showed that when the pH value was 3, the molar concentration ratio of Fe2+ and PMS was 0.8:1, the conversion effect was the best. When the concentration of I− was 20 μmol/L, the conversion rate of I− was 94 %. Under the action of sulfate radical (SO4
−), the final conversion product of I− is only iodate (IO3
−). With the increase of pH value, the conversion effect will also decrease. The concentration of I− itself also affects the reaction.