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| 1 | Prediction of rockhead using a hybrid N-XGBoost machine learning framework显示文摘The spatial information of rockhead is crucial for the design and construction of tunneling or underground excavation.Although the conventional site investigation methods(i.e.borehole drilling) could provide local engineering geological information,the accurate prediction of the rockhead position with limited borehole data is still challenging due to its spatial variation and great uncertainties involved.With the development of computer science,machine learning(ML) has been proved to be a promising way to avoid subjective judgments by human beings and to establish complex relationships with mega data automatically.However,few studies have been reported on the adoption of ML models for the prediction of the rockhead position.In this paper,we proposed a robust probabilistic ML model for predicting the rockhead distribution using the spatial geographic information.The framework of the natural gradient boosting(NGBoost) algorithm combined with the extreme gradient boosting(XGBoost)is used as the basic learner.The XGBoost model was also compared with some other ML models such as the gradient boosting regression tree(GBRT),the light gradient boosting machine(LightGBM),the multivariate linear regression(MLR),the artificial neural network(ANN),and the support vector machine(SVM).The results demonstrate that the XGBoost algorithm,the core algorithm of the probabilistic NXGBoost model,outperformed the other conventional ML models with a coefficient of determination(R2)of 0.89 and a root mean squared error(RMSE) of 5.8 m for the prediction of rockhead position based on limited borehole data.The probabilistic N-XGBoost model not only achieved a higher prediction accuracy,but also provided a predictive estimation of the uncertainty.Thus,the proposed N-XGBoost probabilistic model has the potential to be used as a reliable and effective ML algorithm for the prediction of rockhead position in rock and geotechnical engineering. | Xing Zhu Jian Chu Kangda Wang Shifan Wu Wei Yan Kiefer Chiam | 2021 | Journal of Rock Mechanics and Geotechnical Engineering2021，13，6： | 3 |
| 2 | Analyses on interactions of two identical semi-elliptical surface crack in the iInternal surface of a cylindrical pressure vessel显示文摘 | Chai Guozhong Zhang Kangda Wu Dongdi | 1996 | Int J Pres Ves & Piping1996，67，： | 1 |
| 3 | Stress intensity factors for interaction of surface crack and embedded crack in显示文摘 | Chai Guozbong Zhang Kangda | 2000 | International a cylindrical pressure vessel Journal of Pressure Vessels and Piping2000，77，9： | 1 |
| 4 | Conversion of surgically verified unresectable to resectable hepatocellular carcinoma显示文摘 | Zhaoyou Tang Yeqin Yu Zengchen Ma Rong Yang Xinda Zhou Kangda Liu Jizhen Lu Yanming Bao Zhiying Lin Binghui Yang | 1989 | Chinese Journal of Cancer Research1989，，3： | 1 |
| 5 | Stress intensity factors for semi-elliptical surface cracks in plates and cylindrical pressure vessels using the hybrid boundary element method显示文摘 | Chai Guozhong Zhang Kangda Wu Dongdi | 1995 | Eng Fract Mech1995，52，： | 1 |
| 6 | Comparison of the fracture and fatigue properties of 16MnR steel weld metal, the HAZ and the base metal 显示文摘 | Gao Zengliang Zhang Kangda | 1997 | Journal of Materials Processing Technology1997，63，6： | 1 |
| 7 | Geochronology and Petrogenesis of Granitoid Intrusions in the Feidong District, Southern Tan-Lu Fault Zone, China显示文摘The Feidong district is located in the southern segment of the Tan-Lu fault zone that separates the South China Block(NCB)from the North China Craton(NCC).We report zircon U-Pb geochronology and Hf isotope data,as well as whole-rock geochemistry for Xishanyi granodiorite and Jianshan granite in the Feidong district.Zircon U-Pb dating results show that the emplacement ages of the Xishanyi and Jianshan intrusions are 124±3 Ma and 130±1 Ma respectively,coeval with magmatic events linked to large-scale lithospheric thinning in eastern China.The whole-rock geochemistry of the Xishanyi and Jianshan intrusions demonstrate that they are peraluminous,high potassium calc-alkaline I-type granites with adakitic characteristics.Both intrusions underwent weak crustal assimilation during emplacement.The in situ zirconε(Hf)(t)values of the Xishanyi granodiorites range from-26.4 to-21.8,with T(DM2)model ages of 2552 to 2841 Ma.The in situ zirconε(Hf)(t)values of the Jianshan granite are from-27.5 to-23.0 with T(DM2)model ages of 2632 to 2904 Ma.The peak age of inherited zircon grains from the Xishanyi granodiorite and the Jianshan granite were^2.07 Ga and^1.94 Ga,respectively.After compared with the regional magmatism,we suggest that both the Xishanyi and Jianshan granitoid intrusions were derived from partial melting of the NCC lower crust. | FU Xiang ZHANG Dayu YAO Ziwei REN Kangda DENG Yufeng LI Jiahao JIANG Ren YUAN Feng | 2020 | Acta Geologica Sinica(English Edition)2020，94，6： | 1 |
| 8 | Underground blast effects on structural pounding显示文摘In the present study,actual three-dimensional structures are converted into a stick model of multi degree of-freedom(MDOF)systems for understanding the macro-behavior of structures.The study investigates the performance of three closely spaced,adjacent G+10,fixed-base MDOF systems with the mass aligned at the same levels and subjected to accidental underground blast loading.The acceleration time history of underground blast loading is generated based on past empirical relationships.The blast charge weight varies from 10 to 75 t while keeping the charge distance constant(R=100 m).The entire formulation is solved with the MATLAB solver,using the state space form solution.Three cases are considered,based on changing the position of the three stick systems.The first case considered left building rigid,middle building moderate rigid,and right building flexible.The second assumed left building flexible,middle building rigid,and right building moderate rigid.The third examined the left building as moderate rigid,the middle building as flexible,and the right building rigid.An analysis of the results shows that the arrangement with low stiffness,high stiffness,and moderately stiff buildings placed to the left,middle,and right side,respectively,yields minimum structural response when compared to the other two combinations. | Muhammed Zain Kangda Nilesh Mate Sachin Bakre | 2022 | Earthquake Engineering and Engineering Vibration2022，21，3： | 0 |
| 9 | Method of Monitoring Three-dimensional Mining Surface Deformation Based on InSAR显示文摘In order to solve the problems of small monitoring range,long time and high cost of existing sedimentation observation methods,based on two-view sentinel No.1 radar images of Guqiao mining area in Huainan City from November 4,2017 to November 28,2017,surface change information was obtained in combination with D-InSAR,and the three-dimensional surface deformation was monitored by two-pass method and single line of sight D-InSAR method.The results show that during the research period of 24 d,the maximum deformation of the mining area reached 71 mm,and the southern subsidence was the most obvious,which was in line with the mining subsidence law.The maximum displacement from the north to the south was about 250 mm,while the maximum displacement from the east to the west was about 80 mm,and the maximum subsidence in the center was 110 mm.It is concluded that D-InSAR technique has a good effect on the inversion of the mining subsidence,and this method is suitable for three-dimensional surface monitoring in areas with similar geological conditions.The monitoring results have certain reference value. | Ling QUAN Zijie LONG Zongyao MA Kangda CHEN Xueliang CHEN Yuanping XU Jiale LIU | 2024 | Meteorological and Environmental Research2024，15，1： | 0 |
| 10 | Proton-anion Ion-pair Recognition by a Hexaazatri- phenylene-Hexaurea Receptor显示文摘hexaazatriphenylene (帽子)的识别行为向在 THF 答案的不同的酸的衍生物通过 1 H NMR ,紫外力并且荧光分光镜的实验和半实验的计算,它表明这像推进器的帽子受体能由夹质子和卤素(氯化物或溴化物)共同装配进分层的建筑群阴离子 synergistically 在受体分子之间。而且,对肉眼可见的可逆、显著的颜色变化能被观察,当卤素酸和底或者被介绍时。 | Tianguang Zhan Mengdi Lin Lin Wu Xiang Zhang Liang Zhang Xin Zhao Kangda Zhang | 2017 | Chinese Journal of Chemistry2017，35，4： | 0 |
| 11 | Towards Near-Field Communications for 6G:Challenges and Opportunities显示文摘Extremely large-scale multiple-input multiple-output(XL-MIMO)and terahertz(THz)communications are pivotal candidate technologies for supporting the development of 6G mobile networks.However,these techniques invalidate the common assumptions of far-field plane waves and introduce many new properties.To accurately understand the performance of these new techniques,spherical wave modeling of near-field communications needs to be applied for future research.Hence,the investigation of near-field communication holds significant importance for the advancement of 6G,which brings many new and open research challenges in contrast to conventional far-field communication.In this paper,we first formulate a general model of the near-field channel and discuss the influence of spatial nonstationary properties on the near-field channel modeling.Subsequently,we discuss the challenges encountered in the near field in terms of beam training,localization,and transmission scheme design,respectively.Finally,we point out some promising research directions for near-field communications. | LIU Mengyu ZHANG Yang JIN Yasheng ZHI Kangda PAN Cunhua | 2024 | ZTE Communications2024，22，1： | 0 |
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