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A Vehicle Behavioral Analysis of the Signal Pre-warning Information Provided to the Driver

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Journal of Traffic and Transportation Engineering 2016年第1期4卷 11-17页

作者： Toshiyuki Nakamura Tatsuki Nakayama Nobuhiro Uno Keiichi Yamamura Graduate School of Engineering Kyoto University Kyoto 615-8540 Japan nihonkai consultant co. Ltd. Kanazawa 921-8042 Japan

In this study, we analyze whether there is a change in driver actions because of voice navigation information provided by utilizing ITS （intelligent transport systems）. Specifically, when a vehicle approaches a signalized intersection, the driver is provided with the voice navigation information that the signal light will shortly change red. We focus on what is effective when the voice navigation information is provided. Even if the timing of the provision of voice information is delayed, we have evaluated whether the vehicle is able to stop safely. From the results of the analysis, by providing voice navigation information, we know that a vehicle will stop safely at a signalized intersection. Even if the information provided by voice navigation has been delayed, it co.ld be shown to be safe co.pared with the case where no information was provided.

关键词： Driving simulator signal pre-warning information vehicle behaviour.

The Hong Kong–Zhuhai–Macao Bridge

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Engineering 2019年第1期5卷 10-14页

作者： Yongling Zhu Ming Lin Fanchao Meng Xiaodong Liu Wei Lin Hong Kong–Zhuhai–Macao Bridge Authority Zhuhai 519000 China China co.munications co.struction co. Ltd. Beijing 100088 China CCCC Highway consultant co. Ltd. Beijing 100088 China

The Hong Kong–Zhuhai–Macao Bridge (HZMB) is located at the Pearl River Estuary on the southeast co.st of China;it is the longest as-build marine crossings made of island, tunnel, and bridge. It links Hong Kong in the east with Zhuhai–Macao in the west with a total length of 55 km. The link was built acco.ding to the highway standard of six lanes with three lanes going each way;it has a design speed of 100 km·h^-1 and a design life of 120 years. The HZMB has improved traffic co.ditions on the east and west sides of the co.st of the Pearl River Estuary and strengthened the co.munication, transportation, and eco.omic integration of the three regions, thus accelerating the formation of the Guangdong–Hong Kong–Macao Greater Bay Area. This paper introduces the design and co.struction of the HZMB, with a focus on the new technologies involved in building the artificial islands and immersed tunnel.

关键词： Bridge marine tunnel east has was is it

The W3C Data Catalog Vocabulary,Version 2:Rationale,Design Principles,and Uptake

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Data Intelligence 2024年第2期6卷 457-487页

作者： Riccardo Albertoni David Browning Simon co. Alejandra N.Gonzalez-Beltran Andrea Perego Peter Winstanley Istituto di Matematica Applicata e Tecnologie Informatiche"Enrico.Magenes" Consiglio Nazionale delle Ricerche(IMATI-CNR)GenoaItaly Independent consultant United Kingdom LandandWater CSiROMelbourneAustralia Scientific co.puting Rutherford Appleton LaboratoryScience and Technology Facilities CouncilHarwell Cam-pusOx110QXUnited Kingdom European Parliament Luxembourg Semantic Arts Fort CollinsCO80524USA

DCAT is an RDF vocabulary designed to facilitate interoperability between data catalogs published on the *** its first release in 2014 as a W3C Reco.mendation,DCAT has seen a wide adoption across co.munities and domains,particularly in co.junction with implementing the FAIR data principles(forfindable,accessible,interoperable and reusable data).These implementation experiences,besides demonstrating the fitness of DCAT to meet its intended purpose,helped identify existing issues and ***,over the last few years,additional requirements emerged in data catalogs,given the increasing practice of documenting not only datasets but also data services and *** paper illustrates the new version of DCAT,explaining the rationale behind its main revisions and extensions,based on the co.lected use cases and requirements,and outlines the issues yet to be addressed in future versions of DCAT.

关键词： Data Catalogs Interoperability Disco.erability FAIR data

Study on Vibration Characteristics of Stay Cable-Nonlinear Visco.s Damper System

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Open Journal of Civil Engineering 2022年第2期12卷 153-168页

作者： Xiaolong Li Kai Zhao CCCC Highway consultant co. Ltd. Beijing China

Tension cables are easily prone to generating varied vibrations under the action of external loads, which adversely affects the safety of bridges. Therefore, it is necessary to take effective measures to suppress the vibrations of tension cables. Cable end dampers are widely used in vibration reduction for cable-stayed bridges due to their co.venient installation and low co.ts. However, the previous studies on the tension cable-visco.s damper systems mostly adopt the linear method, and the weakening effect of the flexibility of mounting brackets on the damper vibration reduction is not sufficiently taken into acco.nt. Therefore, this paper adopts the improved Kelvin model to co.duct the derivation, solution, and parametric analysis of vibration equations for the stay cable-nonlinear visco.s damper systems. The results of parametric analysis show that the maximum modal damping ratio that can be obtained by cables and the co.responding optimal damping co.fficient of dampers are co.related with the damping nonlinear co.fficient α, stiffness nonlinear co.fficient β, vibration order n, installation position a/L, and stiffness co.fficient μ, etc.;among them, n damping nonlinear co.fficient α and stiffness nonlinear co.fficient β are the key parameters that affect the parameter design of dampers, where damping nonlinear co.fficient α mainly co.trols the optimal damping co.fficient and stiffness nonlinear co.fficient β mainly co.trols the maximum damping ratio. Based on the parametric analysis, the design principles of dampers and value requirements of key parameters under different vibration suppression objectives are presented.

关键词： Stay Cable Vibration Nonlinear Visco.s Damper Damper Design Method Parametric Analysis

用低碱度硫铝酸盐水泥制备的砂浆和混凝土的物理性能(英文)

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硅酸盐学报 2010年第9期38卷 1623-1630页

作者： FUJITA Hideki KURAUCHI Hidetoshi NAKARAI Kenichiro TSUJI Yukikazu Research Center Taiheiyo Consultant Co.Ltd. Graduate School of Engneering Department of Civil and Environmental EngineeringGunma University

制备了低碱度硫铝酸盐水泥,并对由该水泥制备的砂浆和混凝土的物理性能进行了测试分析。结果表明:低碱度硫铝酸盐水泥砂浆和混凝土的抗压强度发展良好,过量的缓凝剂会降低其早期强度。在水灰比为0.65的情况下,其砂浆和混凝土的长期抗压... 详细信息

制备了低碱度硫铝酸盐水泥,并对由该水泥制备的砂浆和混凝土的物理性能进行了测试分析。结果表明:低碱度硫铝酸盐水泥砂浆和混凝土的抗压强度发展良好,过量的缓凝剂会降低其早期强度。在水灰比为0.65的情况下,其砂浆和混凝土的长期抗压强度发展缓慢。水灰比和抗压强度之间不存在线性关系。新拌混凝土会出现体积收缩,但随之转变为体积膨胀,并持续10～30d。当粉煤灰和石灰石粉作为掺合料替代部分水泥时,其砂浆和混凝土的强度会下降,但仍能满足实际应用的要求;此外,粉煤灰和石灰石替代部分水泥还能减小混凝土的绝热温升、改善其流动性。

关键词：低碱度硫铝酸盐缓凝剂新拌性能硬化性能

采用薄型砂浆试样评价抗硫酸盐侵蚀性能的方法(英文)

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硅酸盐学报 2014年第2期42卷 135-141页

作者： Shunsuke HANEHARA Tetsuya OYAMADA Ito HATAKEYAMA Atsushi KUBOYAMA Faculty of Engineering Iwate University Morioka Iwate 261--8551 Japan Fukken Gijyutsu consultant co. Ltd Sendai Miyagi 980--0012Japan

基于JIS R 5201《水泥物理测试方法》中的标准砂浆模具(40mm×40mm×160mm),研究了一种评价抗硫酸盐侵蚀的测试方法。通过在该标准模具两端放置不锈钢隔板,依次制备出10、15、20、25和40mm厚的砂浆,分别测定不同浸泡时间下砂浆试样的膨... 详细信息

基于JIS R 5201《水泥物理测试方法》中的标准砂浆模具(40mm×40mm×160mm),研究了一种评价抗硫酸盐侵蚀的测试方法。通过在该标准模具两端放置不锈钢隔板,依次制备出10、15、20、25和40mm厚的砂浆,分别测定不同浸泡时间下砂浆试样的膨胀长度。结果表明:垂直于长轴的横截面积越小,即样品越薄,样品出现膨胀的时间越早且膨胀率越大。横截面的等效圆半径与材料膨胀率为0.05%时的龄期的立方根成正比。ASTM C 1012标准中砂浆的制备方法(配合比和龄期)与本方法类似,但本方法成型更简单易行,实用性更强。采用该方法所制备的10和15mm厚的样品与ASTM C 1012—2010标准中规定的测试时间相符。

关键词：抗硫酸盐侵蚀膨胀测试方法硫酸钠耐久性

Microstructure and strength features of warm and ice-rich frozen soil treated with high-performance cements

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Journal of Mountain Science 2019年第6期16卷 1470-1482页

作者： SUN Gao-chen ZHANG Jian-ming DANG Ying-sheng DING co.g State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 10049China China State co.struction Engineering co.poration Aeco. consultant co. Ltd.Lanzhou 730000China co.lege of Water&Architectural Engineering Shihezi UniversityShihezi 832000China Shanghai Investigation Design&Research Institute Co.Ltd.Shanghai 200434China

Warm and ice-rich frozen soil(WIRFS) exhibits lower shear strength due to the weak binding forces between soil particles and ice crystals. To enhance the strength of WIRFS, frozen soil was treated separately with Portland, Phosphate, Sulphoaluminate, Portland-Phosphate and PortlandSulphoaluminate cements. After the samples were cured under -1.0°C for 7 days, the microsco.ic pore distribution characteristics and the macro-mechanical properties of WIRFS were investigated using mercury intrusion porosimetry(MIP), scanning electron microsco.y(SEM) and unco.fined co.pressive strength(UCS) tests. To quantitatively analyze the laws of pore-size transformation and the variation of Hausdorff volumetric fractal dimensions for pre-and post-treated WIRFS, the CURVEEXTRACT and Image-Pro Plus(IPP) image analysis system has been developed for analysing SEM images of the soil samples. Statistics of the pore-area dimension and pore-volume dimension were calculated. The results reveal that the cement-based treatment of WIRFS can improve the cementation fill of soil pores and the bond forces between soil particles. There is an evident co.relation between the microstructure characteristics and the mechanical properties of the treated WIRFS. As the fractal dimensions of pore-area decrease, the unco.fined co.pressive strength of cement-treated WIRFS increases significantly. In co.trast, as the fractal dimensions of pore-volume increases, the unco.fined co.pressive strength decreases remarkably.

关键词： Soil stabilizer Frozen soil Microstructure characteristics Macro-mechanical properties Fractal theory Scanning electron microsco.y

Stabilized effects of L-S cement-mixed batter pile co.posite foundation for existed warm frozen soil subgrade

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Journal of Mountain Science 2023年第2期20卷 542-556页

作者： SUN Gao-chen YAO Gang ZHANG Jian-ming LI Bo LI Jun-qi LIAN Wei-ping WEI Yi School of Civil Engineering Xi’an Shiyou UniversityXi’an 710065China China State co.struction Engineering co.poration AEco. consultant co. Ltd.Lanzhou 730000China State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China

In permafrost regions with warm frozen soil,subgrade thaw-co.lapse phenomenon co.monly occurs,facing thaw co.lapse problems of the existed frozen soil subgrade,thus it is difficult to use traditional methods such as active co.ling and passive protection technology to stabilize the existed warm frozen soil *** study derives a novel stabilizer method,a long-short(L-S)cement-mixed batter pile co.posite foundation to stabilize the existed warm frozen soil *** solve the thawco.lapse problems in warm frozen soil subgrade,high water co.tent and large co.pressibility characteristics were co.pared between soft soil and warm frozen *** analysis of heat co.duction and numerical simulation of finite element model were used to study the freeze–thaw process and evaluate the stabilized effects of the L-S cement-mixed batter piles on the warm frozen soil foundation of the Qinghai-Tibet ***,the thaw process and mechanical properties of foundation and piles were analyzed by introducing the hydration heat factor in the thermodynamic co.trol *** results indicate that the thawing displacement of the existed warm frozen soil subgrade was reduced owing to the“support”and“grasp”effects of the L-S cement-mixed batter piles on the surrounding *** co.posite ground formed by strengthening the warm frozen ground with batter piles co.ld co.siderably improve the bearing capacity of the existed warm frozen ground,effectively restrain the deformation of the upper embankment,and improve the strength of the *** analysis can provide method for the co.struction design of cement mixing batter pile foundation in co.d regions.

关键词： Warm frozen soil subgrade Thaw co.lapse Thermal disturbance Long-short cementmixed batter pile Existed frozen soil subgrade

Positioning performance analysis on co.bined GPS/BDS precise point positioning

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Geodesy and Geodynamics 2020年第1期11卷 78-83页

作者： Jing Xiong Fei Han Key Laboratory of Earthquake Geodesy Institute of SeismologyChina Earthquake AdministrationWuhan 430079China Wuhan Seismic Metrological Verification and Surveying Engineering Institute co. Ltd.Wuhan 430079China Seco.d Highway Investigation and Design Institute of Ministry of co.munication of China CCCC Second Highway Consultant Co.Ltd.Wuhan 430000China

co.bining the observation data from five Multi-GNSS Experiment(MGEX)stations with the precise orbit and clock products from Global Positioning System(GPS)and BeiDou Navigation Satellite System(BDS),we studied the model of co.bined GPS/BDS precise point positioning,and then analyzed the co.vergence speed and short-time(6 h)positioning *** calculation results show that in static positioning,the average co.vergence time of GPS is about 50 min,and its horizontal accuracy is better than 2 cm while the vertical accuracy is better than 4 *** co.vergence speed of co.bined GPS/BDS is about 40 min,and its positioning accuracy is close to that of *** kinematic positioning,the average co.vergence time of GPS is about 72 min,and its horizontal accuracy is better than 5 cm while the vertical accuracy is better than 12 *** average co.vergence time of GPS/BDS is about 57 min,and its horizontal accuracy is better than 3 cm while the vertical accuracy is better than 9 *** GPS/BDS has significantly improved the co.vergence speed,and its positioning accuracy is slightly than that of GPS.

关键词： co.bined GPS/BDS Precise point positioning co.vergence speed Positioning accuracy