Dynamic data-driven railway bridge construction knowledge graph update method     

Jianbo Lai  Jun Zhu  Yukun Guo  Jigang You  Yakun Xie  Jianlin Wu  Ya Hu 《Transactions in GIS》2023,27(7):2099-2117

Effectively integrating and correlating multisource data involved in the bridge construction process is crucial for the improvement of the bridge informatization level. In the current issues of dynamic numerous data and low information sharing between different engineering departments, the traditional information management methods are inefficient in providing comprehensive and accurate data support for construction safety. Focusing on the bridge construction stage, this article proposes a dynamic data-driven construction method of railway bridge construction knowledge graph (KG) in combination with dynamic data (materials, personnel, equipment and sensors) in the construction process and KG technology. By taking a railway bridge as a case, the study develops a prototype system and analyzes the effectiveness of bridge construction KG in material traceability, personnel and equipment management and construction safety guidance, which can provide comprehensive and accurate data support for bridge construction management and construction optimization. The results show that: (1) bridge construction KG that takes into account the dynamic features of bridge projects can effectively integrate multiple elements; (2) the bridge construction KG is dynamically updated through real-time comparison and advance prediction based on the dynamic data collected by multi-sensing equipment at the construction site, and can provide effective data support for guiding bridge construction safety; and (3) the construction management prototype system based on railway bridge construction KG can provide accurate data support for material traceability, personnel and equipment management and assisted risk event decision-making. The results of the comparative experiment between the KG group and the spreadsheet group showed that utilizing the KG saved approximately 50% of time and achieved a 20% higher accuracy rate in the material traceability task compared to the spreadsheet group. In general, this study proposes a dynamic data-driven construction method of railway bridge construction KG, which can effectively realize the effective integration and management of multisource data in the bridge construction process, provide the necessary scientific basis for fine bridge management, and help to improve bridge informatization management level.  相似文献   

Geographic range size patterns across plants and animals of Xinjiang,China     

LiPing Li  ChunYan Zhang  Eimear Nic Lughadha  Tarciso CCLeão  Kate Hardwick  YaoMin Zheng  HuaWei Wan  Ming Ma  Nurbay Abudusalih  Ying Hai  Zhen Pu  JiangShan Lai  ZhanFeng Shen  Li Liu  Tuo Wang  YangMing Jiang  HuiHui Zhao  QingJie Liu 《寒旱区科学》2022,14(1):54-67

Patterns in species geographic range size are relatively well-known for vertebrates,but still poorly known for plants.Contrasts of these patterns between groups have rarely been investigated.With a detailed flora and fauna distribution database of Xinjiang,China,we used regression methods,redundancy analysis and random forests to explore the relationship of environment and body size with the geographic range size of plants,mammals and birds in Xinjiang and contrast these patterns between plants and animals.We found positive correlations between species range size and body size.The range size of plants was more influenced by water variables,while that of mammals and birds was largely influenced by temperature variables.The productivity variable,i.e.,Enhanced Vegetation Index(EVI)was far more correlated with range size than climatic variables for both plants and animals,suggesting that vegetation productivity inferred from remote sensing data may be a good predictor of species range size for both plants and animals.  相似文献   

The earliest well-dated archeological site in the hyper-arid Tarim Basin and its implications for prehistoric human migration and climatic change   总被引：3，自引：0，他引：3  

WenXia Han  LuPeng Yu  ZhongPing Lai  David Madsen  Shengli Yang 《Quaternary Research》2014

The routes and timing of human occupation of the Tibetan Plateau (TP) are crucial for understanding the evolution of Tibetan populations and associated paleoclimatic conditions. Many archeological sites have been found in/around the Tarim Basin, on the northern margin of the Tibetan Plateau. Unfortunately, most of these sites are surface sites and cannot be directly dated. Their ages can only be estimated based on imprecise artifact comparisons. We recently found and dated an archeological site on a terrace along the Keriya River. Our ages indicate that the site was occupied at ~ 7.0–7.6 ka, making it the earliest well-dated archeological site yet identified in the Tarim Basin. This suggests that early human foragers migrated into this region prior to ~ 7.0–7.6 ka during the early to mid-Holocene climatic optimum, which may have provided the impetus for populating the region. We hypothesize that the Keriya River, together with the other rivers originating from the TP, may have served as access routes onto the TP for early human foragers. These rivers may also have served as stepping stones for migration further west into the now hyper-arid regions of the Tarim Basin, leading ultimately to the development of the Silk Road.  相似文献   

Experimental and theoretical investigations on high-pressure phase transition of Sr2Fe2O5     

Feng Zhu  Ye Wu  Xiaojing Lai  Shan Qin  Ke Yang  Jing Liu  Xiang Wu 《Physics and Chemistry of Minerals》2014,41(6):449-459

Sr₂Fe₂O₅ is a typical oxygen-deficient perovskite and adopts brownmillerite phase (Ibm2, Z = 4) at ambient conditions. Its high-pressure structural behavior has been investigated by both synchrotron radiation X-ray diffraction with diamond anvil cell technique and first principles calculations. Experimental results clearly show that the brownmillerite Sr₂Fe₂O₅ transforms into a tetragonal perovskite-type phase at 12.0 GPa and room temperature, and then into a Sr₂Mn₂O₅-type phase (Pbam, Z = 2) at 23.3 GPa after high-temperature annealing. The Sr₂Mn₂O₅-type phase is stable up to at least 60 GPa and it further undergoes a reversible transition to a lower symmetry phase at 79.1 GPa and ~2,000 K. The results from theoretical calculation not only confirm that the tetragonal phase of Sr₂Fe₂O₅ is isostructural with the high-temperature structure of Ba₂In₂O₅ (I4/mcm, Z = 4), but also predict a series of phase transitions from brownmillerite phase to Ba₂In₂O₅-type phase at 6.9 GPa, and then to Sr₂Mn₂O₅-type phase at 19.7 GPa, which coincides with present experiment results. Isothermal pressure–volume relationship of the Sr₂Mn₂O₅-type phase can be well described by the Birch–Murnaghan Equation of State with V ₀ = 111.6(10) ų, B ₀ = 122(9) GPa, B ₀ ^′  = 4(fixed) experimentally and V ₀ = 115.8(3) ų, B ₀ = 92(4) GPa, B ₀ ^′  = 4(fixed) theoretically. The transition mechanism from brownmillerite to Ba₂In₂O₅-type phase is the displacement of four-coordinated Fe³⁺ ions to higher coordinated positions upon compression. In addition, a semiconductor-to-metal crossover is predicted from brownmillerite to Ba₂In₂O₅-type or Sr₂Mn₂O₅-type phase.  相似文献   

山东济宁三号煤矿上组煤水文地质条件分析     

宋友凯  ;来永伟  ;刘艳  ;孔庆虎  ;李本军  ;齐荣贵 《中国煤炭地质》2014,(7):45-51

济宁三号煤矿目前开采的煤层为上组煤的3煤(3上、3下煤),自投产以来,发生多次涌水,如13下01综放面侏罗系底部含水层最大涌水量达533.84m3/h,63下01综放3煤顶板砂岩最大涌水量527m3/h,曾一度出现工作面局部被淹而导致停产,对矿井的安全高效生产构成了极大的威胁。在综合分析研究上组煤顶板各含水层的水文地质特征和充水条件的基础上,认为上组煤(3上、3下煤)开采时的直接充水水源为3煤顶板砂岩含水层;间接充水水源是侏罗系含水层水以及局部地区对侏罗系含水层起补给作用的第四系含水层;部分地区侏罗系含水层被采动裂隙导通而成为直接充水水源,大部分地段第四系底部均为粘土,有效的阻隔了第四系与下伏侏罗系含水层的水力联系,对下伏含水层补给微弱;充水通道主要有断层、采动裂隙、封闭不良钻孔和破坏的井筒。为指导下一步煤矿生产预防水害事故提供了依据。  相似文献   

http://www.sciencedirect.com/science/article/pii/S167498711300159X     

Fei Gao  Lily Wang  Mudan Yin 《地学前缘(英文版)》2014,5(2):299-301

The 2013 Geoscience Frontiers Annual Convention was held in Beijing, China during Nov. 1-2, 2013 hosted by China University of Geosciences, Beijing （CUGB） （Fig. 1 ）. This conference assembled earth scientists from 5 countries, including China, India （Dr. C. Manikyamba, Miss Preetha Warrier）, Japan （Prof. T. Tsunogae）, South Korea （Prof. S. Kwon） and South Africa （Prof. H.M. Rajesh）, and also representatives from Elsevier （Beijing） and Thomson Reuters （Beijing） offices.  相似文献   

Numerical analysis for cooling effect of open boundary ripped-rock embankment on Qinghai-Tibetan railway   总被引：6，自引：0，他引：6  

Lai?Yuanming?Email author  Zhang?Mingyi  Liu?Zhiqiang  Yu?Wenbing 《中国科学D辑(英文版)》2006,49(7):764-772

At present, the Qinghai-Tibetan railway is being built, and it will pass across more than 550-km perma-frost regions. Therefore, the key to the stability of therailway embankment lies in solving the permafrost problem. Because global warming and existence of railway tend to degrade the permafrost in these re-gions[1], more difficulties and problems are induced in the construction and maintenance of railway. In the area where the mean annual air temperature is higher than a certain value, the …  相似文献   

高频基准面旋回控制下浅水三角洲及其砂体发育模式:以松辽盆地扶余油田白垩系泉头组为例^*          下载免费PDF全文

赖洪飞  秦智  王洪君  郑锡  林艳波  鲍志东  李美俊  张云龙  张莉  吴煜潇  宋健  何陵沅 《古地理学报》2017,19(4):609-622

浅水三角洲储集层在陆相湖盆油气勘探中具有重要的意义,但基于密井网资料的精细研究仍十分缺乏。以高分辨率层序地层学和沉积学理论为指导,以松辽盆地扶余油田DT91区块白垩系泉头组四段第Ⅲ砂组14余口取心井的岩心资料和700余口密井网测井资料为对象,分析了高频基准面旋回下浅水三角洲及其砂体的发育规律。研究结果表明: (1)浅水三角洲储集层主要发育在河道、漫溢砂、分流砂坝、天然堤、决口扇和席状砂等6种成因砂体,以河道砂体和分流砂坝砂体为主。(2)在岩心和测井曲线上可识别出河道底部冲刷面、进积—退积作用面、退积—进积作用面和湖泛面等4种基准面旋回物理界面;并识别出3大类、7亚类超短期基准面旋回类型。(3)高频基准面旋回演化过程中,湖泊浅水三角洲沉积区可容空间变化不大,沉积物供给通量在可容空间增长速率(accommodation increasing rate,A)和沉积物供给通量(sediment supply rate,S)的比值A/S变化中起着主导作用,进而控制着成因砂体的数量和空间接触关系。当A/S值由小变大时,浅水三角洲的规模快速变小,成因砂体的数量也相应减少;同时,成因砂体垂向接触方式由下切叠加式→加积叠加式→孤立式变化,砂体平面分布的复合连片程度也发生由高到低的变化。  相似文献   

http://dx.doi.org/10.1016/j.gsf.2016.11.001     

Fei Gao  Lily Wang  Yongqiang Yang  Mudan Yin 《地学前缘(英文版)》2017,8(2):409-410

正The 2016 Geoscience Frontiers Annual Convention was held in Beijing,China on October 14,2015 hosted by China University of Geosciences,Beijing(Fig.1).This convention assembled earth scientists from six countries,including Australia(Dr.Christopher Spencer),Italy(Prof.Emilio Saccani),India(Prof.G.Parthasarathy and Prof.M.Jayananda),Japan(Prof.Masaki Yoshida),UK(Dr.Nick Roberts),China,and also representative from Elsevier(Beijing).  相似文献   

Experimental investigation of fine sediment deposition using particle image velocimetry     

Masoumeh MoayeriKashani  Lai Sai Hin  S. Ibrahim 《Environmental Earth Sciences》2017,76(19):655

In order to create natural and healthy water ecosystems, the impact of hydrological processes in ponds must be identified. Pond structure may affect water quality in many ways. The present study provides a novel insight into some of the hydrological processes as well as how to employ retentions to enhance storm water detention and manage discharge. In this research, particle image velocimetry is utilized to study the two-dimensional collecting efficiency of fine sediments by retention structures with a range of hydraulic features. To examine the hydrodynamic behavior of water mixed with fine particles, a sediment basin was designed. Fluorescent polymer particles (1–50 μm) were subsequently added to this fluid mix. This study demonstrates that gravitational force increases fine particle settlement by over 50% at greater depths. The optimum collecting efficiency of sediments at the water surface was found to be around 80%. It was also determined that flow rate and particle size are directly correlated and that inlets and outlets at higher levels impede fine particle dispersion in the water column. For these reasons, it seems that adjusting the hydraulic parameters may diminish siltation.  相似文献