bluuebunny/crossref_metadata_2025_split huggingface dataset:
Numerical Analysis of Bolt Support at Roadway Intersection in Yanghui Mine, Vietnam
Authors: Li Pengfei , Cao Chen , Van Cong Tran 
Published: March 2020

Abstract
The stress of surrounding rock at roadway intersection is complex. U-shaped steel support has been used at the roadway intersection of Yanghui Mine in Vietnam, but there are many problems, such as blocked ventilation and limited passing capacity. In this paper, FLAC3D numerical simulation software is used to simulate the support effect of U-shaped steel and bolt based on the field data of Yanghui Mine. The deformation of roof, floor and two sides are compared. The results show that the bolt support can be applied to the intersection of roadways in the mine to improve the support of the mine.
Experimental Research on the Deformation and Failure Characteristics of Coarse-Grained Soil Slopes in Seasonal Frozen Region along Sichuan-Tibet Railway
Authors: Zhao Mengyi , Xie Qiang , Ren Xinhong , Zhu Lei , Chen Pengfei 
Published: March 2020

Abstract
The field investigation of the seasonal coarse grained frozen soil slopes along the eastern section of the proposed Sichuan-Tibet railway shows that the deformation and failure of the slopes are widespread. In order to explore the deformation characteristics and failure mechanisms of the slopes in this area and provide a basis for the design and protection of the slopes along Sichuan-Tibet railway, laboratory model tests on the seasonal coarse grained frozen soil slopes under snowfall conditions were conducted. The results show that, the deformation and failure of the seasonal coarse grained frozen soil slope are caused by the repeated alternation of the failure of the surface soil structure caused by frost heave and the surface soil saturation caused by snow thaw infiltration, and the reduction of the shear strength of the surface soil under repeated freezing and thawing conditions. The deformation and failure of the seasonal coarse grained frozen soil slopes along the eastern section of the Sichuan-Tibet railway are mainly characterized by creep-flowed, topsoil slip and slippage on slope surface. The emphasis of slope protection in this area are slope thermal insulation and waterproof.
A Study on the Friction Dynamic Response of Asphalt Pavement Considering the Unevenness
Authors: Zhang Endong 
Published: March 2020

Abstract
In order to quantitatively analyse the influence of pavement unevenness on the stress of asphalt pavement, a tire-road coupling model with stable rolling was established. Sinusoidal wave is used to describe the pavement unevenness, and based on the established tire-road coupling model, different conditions of axle load and base elastic modulus are used to analyse the influence of unevenness on the dynamic response of asphalt pavement. The results show that the influence of unevenness on vertical stress of asphalt pavement increases with the increase of axial load. As the elastic modulus of base increases, the vertical stress of asphalt layer will decrease, while the vertical stress of base layer increases. But the influence of unevenness on dynamic response of asphalt pavement cannot be eliminated. Therefore, the unevenness should be taken into account in the simulation of real road surface.
Research on On-Site Monitoring and Measurement Technology of Tunnel
Authors: Li Chongxue , Wang Mingfei , Gao Xuekai , Yang Bin 
Published: March 2020

Abstract
The frequent occurrence of tunnel safety accidents threatens the safety of people’s lives and property, and the research on the on-site monitoring and measurement technology of tunnels is very necessary. Practical applications of tunnel on-site monitoring and measurement technology include electronic total station and micro-deformation monitoring radar. Among them, radar interferometry technology is used for deformation monitoring in on-site monitoring and measurement, such as vault settlement. The built millimeter wave radar deformation measuring instrument can complete the vault settlement monitoring of the tunnel on-site monitoring. During the tunnel construction period, it is necessary to make a selection according to the specific engineering objectives, adopt appropriate observation and test methods, obtain new deformation displacement information, and analyze and predict the deformation of the construction.
A Model Calculation of the Air Flow Regimes and Thermal Patterns in a Subway Station Using STESS Software: The Case of Iran
Authors: Zhi Yansheng 
Published: March 2020

Abstract
This study examines the impact of mode of ventilation and equipment operation on air flow regimes and thermal patterns of subway stations and channels to provide actionable guidance for selecting design tactics that are based on the normal and accident conditions. A case analysis and STESS software were conducted utilizing a station without platform edge doors and the two lines channel with slopes up to 50‰ to access the impact of ventilation and equipment operation on occupant exposure. As such, the results of the case in Iran analysis emphasized the application of STESS software is suitable for simulating the ventilation tactics and improving the air flow regimes and thermal patterns of the stations and channels in normal and accident conditions.
The Design and Study on Long-Span Road-Rail Cable-Stayed Bridge
Authors: Zhang Xianqing , Guo Shulun , Lei Junqing 
Published: March 2020

Abstract
The main content of this paper is to study the Steel Road-Rail Cable-stayed Bridge with a main span of 1200m. The finite element model is established by large-scale analysis software to calculate the response of the structure under load. Based on the calculation results, the rationality of long-span cable-stayed bridge are preliminarily researched in this paper.
Study on Ground Motion Intensity Measures for Seismic Response Evaluation of Circular Tunnel
Authors: Zhang Chengming , Zhong Zilan , Zhao Mi 
Published: March 2020

Abstract
Ground motion intensity measure (IM) is a key link between the seismic hazard analysis and structural seismic response analysis, which play an important role in the performance-based earthquake engineering framework. In order to find suitable IM for seismic response evaluation of circular tunnel, nonlinear dynamic time-history analyses are conducted on a two-dimensional finite element model of tunnel-surrounding rock interaction in this study. The near field ground motions without velocity pulse and far field ground motions as recommended by FEMA-P695 are used as the input ground motions for the numerical model. Besides, the overall lining damage indices in compression and in tension are used as engineering damage measures (DMs) to estimate the lining damage state. The applicability of 20 existing ground motion IMs commonly used in engineering practice are investigated in this study. Statistically regression analysis is carried out for results obtained from nonlinear time-history analyses. Based on the criteria of efficiency and sufficiency, Arias intensity is identified as the optimal IM for seismic response prediction of circular tunnel structure.
Analysis on Deformation Control Technology for Large-Span Subway Tunnels from High-Narrow Channel
Authors: Yang Lin , Wang Wei , Jiang Hong 
Published: March 2020

Abstract
The construction process of the transverse channel to the large-span tunnel is complicated, the mechanics change frequently, and the construction safety risk is high. Relying on the Huangshan Street Station project of Wulumuqi subway tunnel, combined with the key technology in the construction of the transverse channel to the large-span tunnel, this paper aims to analysis the deformation during the construction of subway tunnel from transverse channel by numerical simulation method. The results demonstrate that the the bearing system of “frame beam plus middle diaphragm” is adopted in the construction of the main tunnel with large cross-section, and the deformation can be effectively controlled by “double-layer support structure” in the sand gravel layer. Therefore, the surface settlement has passed through three stages of “rapid growth—slow growth—stable”, and the maximum value of 13.32mm, which ensures the construction safety in the breaking process of transverse channel. Moreover, when the temporary middle partition wall is removed, the displacement of the measuring point will be greatly deformed during the construction of the positive hole. So the length of the support removed should be shortened, no more than 6m and on-site monitoring should be strengthened in this process.
Numerical simulation of the time-history of longitudinal displacement of railway shield tunnel in soft soil area during operation period
Authors: Chen Shuyang , Wang Zhe , Zhang Xiaochun 
Published: March 2020

Abstract
In this study, the finite element simulation method was used to establish the finite element model of the soft soil base-shield tunnel-track structure, and the time history of the longitudinal displacement of the shield tunnel section under the train load in a coastal area in operation was analyzed and studied. Based on the mechanical background of creep in soft soil, the evolution and recovery of tunnel longitudinal displacement during operation period and night maintenance period, the change of tunnel longitudinal displacement during one year of railway operation, and the influence of railway acceleration on tunnel longitudinal displacement were studied. The conclusions are as follows: (1) the recovery of tunnel geometry during night maintenance time is small and negligible;(2) after the tunnel was put into operation, it showed a slight upward floating trend, and the upward floating in about 100 days had reached more than 90% of the one-year upward floating volume;(3) if the railway is accelerated to 200km/h for operation, the impact on the tunnel geometry is relatively small. At the same time, based on the above data, this paper puts forward a suggestion on the operation safety of the tunnel section near the station.
Construction Method of Deep - Buried Long - Length Tunnel
Authors: Li Ping , Lu Qingrui , Chen Shijun , Dai Renhui , Gao Jinhe , Jiang Xiaoyi 
Published: March 2020

Abstract
Grew up to solve the deep buried tunnels in the process of large diameter TBM excavation overexcavation problems and obstacles in a complex geological environment problems such as TBM, through the combination of drilling and blasting method and TBM at home and abroad were elaborated the expansion digging method of construction application, show that the drilling and blasting method and TBM method combined with the construction to prevent deep grew up section tunnel overbreak problems and improve resource utilization and avoid TBM card machine under complicated geological problems effectively.
Distribution and Pollution Assessment by Index of Geoaccumulation about the Heavy Metals in Sediments of Dexing Copper Mine Rainwater Network
Authors: Huang Xueping , Fu Qiang , Wang Jianhua 
Published: March 2020

Abstract
The sediment in the rainwater pipe network in Dexing copper mine area was selected as the research object. Using ICP-MS to determinate the 6 kinds of heavy metals content in sediments at 16 samplings, the measured data were analyzed in comparison with the national standard for soil environmental quality, and the geological accumulation exponential method was used for evaluating the heavy metals in sediments. The results showed that the content of Cu and as exceeded the national grade III soil quality standard in many areas, but the regional difference was not obvious. The content of Cd exceeds the national grade III soil quality standard in some regional samples, and its spatial distribution features were very prominent. The total amount of Cr, Zn and Pb was lower than the national grade III soil quality standard. It was found that the pollution degree of Cd was the most serious, followed by Cu and As, Cr, Zn and Pb with the assessment by Index of geoaccumulation.
Design and Application of the Safety Monitoring System of a Hydropower Station in Myanmar
Authors: Rao Zhenbin , Liu You-ping , Song Aili 
Published: March 2020

Abstract
The Safety Monitoring System of the Hydropower Station in Myanmar are composed of the gravity dam monitoring, slope monitoring, the diversion and power generation system monitoring, etc. The Design of safety monitoring project includes the perambulation and inspection, deformation monitoring benchmark network of head works, environmental capacity, concrete gravity dam, slope, water diversion and power generation system, etc. The Safety monitoring automation system mainly consists of sensor, data acquisition device, power supply and communication lines, the first station equipment, etc. The software of the safety automatic monitoring system includes data collection, information management and information analysis. With the completion of safety monitoring system, it successfully realized that the optical fiber Ethernet network communicate as a whole between the scene monitoring stations and the field monitoring station. Because of the change of the engineering geology, the monitoring system in the construction and operation stage should be redesigned and rearranged. At last, the operation of the system is stable and reliable, and it rapidly and timely provide a large number of accurate and reliable data of security monitoring.
Evaluation for Village Development Based on GRA-TOPSIS Method
Authors: Shi Huan , Gan Lu 
Published: March 2020

Abstract
This paper establishes a comprehensive evaluation indication system of village development, Furthermore, the grey relation analysis (GRA) and technique for order preference by similarity to ideal solution (TOPSIS) model were combined to assess village with combinational weights. Then, 12 villages in Tibetan Region of Northwest Sichuan was verified to the validity of the model. Finally, the paper chooses central, basic and weak villages and proposes the suggestions for village development in the future. The results show that the evaluation indication system, as well as evaluation method are valid and reasonable, and it also have guiding significance for in-situ urbanization in ethnic regions.
Treatment of Main Geological Defects during Excavation Construction of Wudongde Underground Powerhouse Caverns
Authors: Zhang Cunhui , Zhou Shuda , Du Shenwei 
Published: March 2020

Abstract
Underground powerhouse is adopted by Wudongde hydropower plant on both left and right bank. The excavation scale of the main powerhouse is 333.0×32.5×89.8m (length×width×height ) that ranks top on the world. The underground powerhouse caverns are hosted in the fold basement of the Presinian system that belongs to the layered epimetamorphic rock. Geological condition is complicated and rock stratum is steep towards the downstream and characterizes in “thin, hard and crisp”. During excavation construction of the underground powerhouse, geological defects such as small angle between surfaces, B type breccia, carbon film attached on surface, blocks, large and long discontinuities with small angle are exposed. The targeted treatments for the geological defects are proposed and implemented based on numerical feedback analysis and references of similar finished projects. Excavation and supports of the main powerhouse are all constructed completely at present and monitoring displacements tend to be convergent. The proposed treatments are verified to be reasonable and effective and provide reference for subsequent similar projects.
Investigation and Analysis of Earthquake Resistance of Rural Buildings in Northeast China
Authors: Liang Yongduo , Yi Lujun 
Published: March 2020

Abstract
In this paper, the authors investigated 200 typical rural houses in northeast China, and the seismic performance of this rural houses was analysed from foundation form, construction materials, component connection, and seismic structural measures, and so on. In general, over 80 percent samples lack enough seismic capacity is manifested in the lacking of seismic structural measures and the problem of component connections. In the end, some countermeasures and suggestions were put forward to improve the seismic performance of the rural houses, and these may provide some references for the work of earthquake prevention and disaster reduction in northeast China.
Study on Landslide Monitoring Experiment of Underground Chambers Spoil Area
Authors: Qiao Nan , Duan Yunling , Wei Xuefei , Shi Xiaomeng 
Published: March 2020

Abstract
The spoil area for wastes of underground engineering is featured with large scale, loose accumulations, high and steep slopes, and no roads. Traditional contact monitoring methods are difficult to operate, and representative points are difficult to choose to characterize the overall deformation of the slope. In this case, this paper attempts to apply the GB-InSAR system to carry out on-site monitoring and experimental research based on China’s first large-scale groundwater storage and storage waste rock yard. The research results show that: (1) GB-InSAR full-field scanning can effectively solve the problem in selecting representative points on the side slope surface to present the overall deformation of the slope; (2) 4 different modes of the slope’s -0.5mm equal displacement cross-sectional area are shown over time; (3) The final maximum landslide area of type B1 are 0.56 times at most of the cross-sectional area of -0.5mm equal displacement before the landslide, and type B2 are at most 0.96 times.
Interface chemistry and thermoelectric characterization of Ti and TiOx contacts to MBE-grown WSe2
Authors: Freedy Keren M , Zhu Tianhui , Olson David H , Litwin Peter M , Hopkins Patrick E , Zebarjadi Mona , McDonnell Stephen J 
Published: March 2020

Abstract
WSe2 has demonstrated potential for applications in thermoelectric energy conversion. Optimization of such devices requires control over interfacial thermal and electrical transport properties. Ti, TiOx, and Ti/TiOx contacts to the MBE-grown WSe2 are characterized by XPS and transport measurements. The deposition of Ti is found to result in W-Se bond scission yielding metallic W and Ti-Se chemical states. The deposition of Ti on WSe2 in the presence of a partial pressure of O2, which yields a TiOx overlayer, results in the formation of substoichiometric WSex (x < 2) as well as WOx. The thermal boundary conductance at Ti/WSe2 contacts is found to be reduced for greater WSe2 film thickness or when Au/TiOx interface is present at the contact. Electrical resistance of Au/Ti contacts is found to be higher than that of Au/TiOx contacts with no significant difference in the Seebeck coefficient between the two types of contact structures. This report documents the first experimental study of Ti/WSe2 interface chemistry and thermoelectric properties.
Polynomial fitting techniques applied to opto-mechanical properties of PDMS Sylgard 184 for given curing parameters
Authors: Santiago-Alvarado A , Cruz-Félix A S , González-García J , Sánchez-López O , Mendoza-Jasso A J , Hernández-Castillo I 
Published: March 2020

Abstract
Mechanical and optical properties of Polydimethylsiloxane (PDMS) have been measured and reported for different applications, however, a full analysis and a compendium of its tension and compression moduli behaviour have not been carried out, nor of its refractive index, for several mixture ratios, temperature and curing time. In this work, samples of PDMS were manufactured and tested to know tension and compression moduli and refractive index as a function of fabrication parameters; Minitab®, Matlab®’s Least-squares fitting in Curve Fitting Toolbox™ and genetic algorithms were employed to yield functional dependencies to describe PDMS’s behavior. The obtained fitting polynomials are shown to have large agreement with experimental data. Finally, a potential application in the design of a gradient index lens for use in artificial vision is presented.
Soliton molecules and asymmetric solitons in three fifth order systems via velocity resonance
Authors: Lou S Y 
Published: March 2020

Abstract
Soliton molecules can be formed in some possible mechanisms both theoretically and experimentally. In this paper, we introduce a new mechanism, namely the velocity resonant, to find soliton molecules. Under the velocity resonance mechanism, two solitons can form a kink-antikink molecule, an asymmetric soliton, a two-peak soliton and/or a far away bounded molecule depended on the selections of the wave numbers and the distance between two solitons of a molecule. The results are exhibited via three well known fifth order integrable systems which serve as a general fluid model, as well as models many other physical fields.
Novel water-based nanolubricant with superior tribological performance in hot steel rolling
Authors: Wu Hui , Jia Fanghui , Li Zhou , Lin Fei , Huo Mingshuai , Huang Shuiquan , Sayyar Sepidar , Jiao Sihai , Huang Han , Jiang Zhengyi 
Published: March 2020

Abstract
Novel water-based nanolubricants using TiO2 nanoparticles (NPs) were synthesised by adding sodium dodecyl benzene sulfonate (SDBS) and glycerol, which exhibited excellent dispersion stability and wettability. The tribological performance of the synthesised nanolubricants was investigated using an Rtec ball-on-disk tribometer, and their application in hot steel rolling was evaluated on a 2-high Hille 100 experimental rolling mill, in comparison to those without SDBS. The water-based nanolubricant containing 4 wt% TiO2 and 0.4 wt% SDBS demonstrated superior tribological performance by decreasing coefficient of friction and ball wear up to 70.5% and 84.3%, respectively, compared to those of pure water. In addition to the lubrication effect, the suspensions also had significant effect on polishing of the work roll surface. The resultant surface improvement thus enabled the decrease in rolling force up to 8.3% under a workpiece reduction of 30% at a rolling temperature of 850 °C. The lubrication mechanisms were primarily ascribed to the formation of lubricating film and ball-bearing effect of the TiO2 NPs.
Explanatory Model for Asthma Disparities in Latino Children: Results from the Latino Childhood Asthma Project
Authors: Arcoleo Kimberly , Marsiglia Flavio , Serebrisky Denise , Rodriguez Juliana , Mcgovern Colleen , Feldman Jonathan 
Published: March 2020

Abstract

Background
Little research has been conducted that integrates, in one explanatory model, the multitude of factors potentially leading to disparities among Latino children.

Purpose
A longitudinal, observational study tested an explanatory model for disparities in asthma control between Mexican and Puerto Rican children with persistent asthma requiring daily controller medication use.

Methods
Mexican and Puerto Rican children aged 5–12 years (n = 267) and their caregivers (n = 267) were enrolled and completed interviews and child spirometry at baseline and 3, 6, 9, and 12 months postenrollment. A 12 month retrospective children’s medical record review was completed. Participants were recruited from two school-based health clinics and the Breathmobile in Phoenix, AZ, and two inner-city hospital asthma clinics in the Bronx, NY.

Results
Statistically significant differences in the social/contextual predictors of asthma illness representations (IRs) were noted between Mexican and Puerto Rican caregivers. The structural equation model results revealed differences in asthma control over time by ethnicity. This model accounted for 40%-48% of the variance in asthma control test scores over 12 months. Caregivers’ IRs aligned with the professional model of asthma management were associated with better children’s asthma control across 1 year. These results also supported the theoretical notion that IRs change over time impacting caregivers’ treatment decisions and children’s asthma control.

Conclusions
These findings extend a previous cross-sectional model test using a more comprehensive model and longitudinal data and highlight the importance of considering within-group differences for diagnosis and treatment of children coming from the vastly heterogeneous Latino umbrella group.

Trial Registration
Trial number NCT 01099800