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Publisher Correction: Abrupt emissions reductions during COVID-19 contributed to record summer rainfall in China

Nature communications 2022年第1期13卷 1403页

作者： Yang Yang Lili Ren Mingxuan Wu Hailong Wang Fengfei Song L Ruby Leung Xin Hao Jiandong Li Lei Chen Huimin Li Liangying Zeng Yang Zhou Pinya Wang Hong Liao Jing Wang Zhen-Qiang Zhou Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology School of Environmental Science and Engineering Nanjing University of Information Science and Technology Nanjing Jiangsu China. yang.yang@***. Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology School of Environmental Science and Engineering Nanjing University of Information Science and Technology Nanjing Jiangsu China. Atmospheric Sciences and Global Change Division Pacific Northwest National Laboratory Richland WA USA. Atmospheric Sciences and Global Change Division Pacific Northwest National Laboratory Richland WA USA. hailong.wang@pnnl.gov. Frontier Science Centre for Deep Ocean Multispheres and Earth System and Physical Oceanography Laboratory Ocean University of China Qingdao China. Qingdao National Laboratory for Marine Science and Technology (QNLM) Qingdao China. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disaster Ministry of Education Nanjing University for Information Science and Technology Nanjing Jiangsu China. Tianjin Key Laboratory for Oceanic Meteorology Tianjin Institute of Meteorological Science Tianjin China. Department of Atmospheric and Oceanic Sciences and Institute of Atmospheric Sciences Fudan University Shanghai China.

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Study on the theory of three-dimensional limit analysis of soil and practical calculation

Study on the theory of three-dimensional limit analysis of s...

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2018 International Forum on Construction, Aviation and Environmental engineering-Internet of Things, IFCAE-IOT 2018

作者： Lia, Bin Fu, Jianbao Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering Guilin University of Technology Guilin541000 China Tianjin Port Engineering Institute Co. Ltd. CCCC First Harbor Engineering Co. Ltd. Tianjin300222 China Key Laboratory of Port Geotechnical Engineering Ministry of Communications PRC Tianjin300222 China Key Laboratory of Tianjin Port Geotechnical Engineering Tianjin300222 China CCCC First Harbor Engineering Company Ltd. Tianjin300461 China China Key Lab. of Failure Mechanism and Safety Contr. Techniques of Earth-rock Dam of the Min. of Water Rsrc. Nanjing210029 China

Based on the stress analysis of a point in space, the stress analysis of a point on a surface is performed, and then the relationship among the normal stress, the shear stress, and the stress component of a point on a surface and the first order partial derivative of the surface equation is deduced. Equilibrium equations of soil columns between the sliding surface and the top surface of the slope are established, which include differential equilibrium equation of force, equilibrium equation of force, and equilibrium equation of moment. These equilibrium equations and Coulomb yield condition can form the fundamental equations of three-dimensional slope stability analysis. Applying the supposition similar to that applied in the simplified Bishop method, a kind of three-dimensional slope analysis method can be obtained. An example is presented to show that the computation method is reasonable and applicable. © The Authors, published by EDP Sciences 2018.

关键词： Stress analysis

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Experimental research on the responses of ship shaft under loadings on bearings 24

Experimental research on the responses of ship shaft under l...

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24th International Congress on Sound and Vibration, ICSV 2017

作者： Zhang, Cong Qin, Li School of Energy and Power Engineering Key Laboratory of Marine Power Engineering and Technology Ministry of Communications National Engineering Research Center for Water Transport Safety Wuhan University of Technology Wuhan430063 China Key Laboratory of Metallurgical Equipment and Control Technology Ministry of Education Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and Technology Wuhan430081 China

With the development of the large-scale ships, the power and size parameters of ship shaft are increasing apparently. As a result, the problems caused by the coupling effects between hull and shaft via bearing structure are prominent. Based on the characteristics of dynamic excitations for the ship shaft, a reasonable experiment plan is designed. In this experiment, transversal, vertical, longitudinal loads are considered on the intermediate bearing and the stern bearing to simulate hull excitations on the bearings. Different rotational speed is also considered. The characteristics of transversal, longitudinal and rotational vibration of propulsion shaft are studied. The coupling effects are discussed.

关键词： Hulls (ship)

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Investigation on the flexural behavior of corroded concrete beams repaired by CFRP sheet under different corrosion levels

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Open Civil engineering Journal 2016年 10卷 598-614页

作者： Su, Linwang Cai, Jian Chen, Qingjun Li, Guobao Zhao, Juan State Key Laboratory of Subtropical Building Science School of Civil Engineering and Transportation South China University of Technology Guangzhou510640 China CCCC Fourth Harbor Engineering Institute Co. Ltd. Guangzhou510230 China Key Laboratory of Durability Technology for Harbor and Marine Structure Ministry of Communications PRC Guangzhou510230 China

The paper presents an investigation on the flexural behavior of corroded reinforced concrete (RC) beam strengthened with Carbon Fiber Reinforced Polymer (CFRP) sheets. Different levels of corrosion are considered as a new method for classifying the corrosion levels of the corroded RC members. Twenty RC beams with five corrosion levels were fabricated by accelerated corrosion equipment, and then the CFRP were used to strengthen these members, considering the effect of different CFRP layers and different strengthened schemes, finally the static flexural load test was carried out. The test results show that the bearing capacity of the CFRP strengthening corroded RC beams is effectively enhanced, the crack width is restrained, and the flexural stiffness is improved. The ultimate flexural capacity of the specimens strengthened by one layer of CFRP sheet raises by 30% to 50% than that of the unstrengthened ones, with the increase of the corrosion level, the enhancement decreased. With the increase of the number of CFRP layers, the bearing capacity increases, while the increasing ratio reduces with the increase in the number of layers. For specimens with obvious cracks, the effectiveness of the strengthening method by bonding CFRP after cutting or chiseling off concrete method (RM1 or RM2) is higher than the method of bonding CFRP directly (DM). It is suggested that the corroded RC members with Level A, B or C1 can be strengthened by DM, while the other level members should be strengthened by RM1 or RM2. The formulae in current design code are used to predict the flexural bearing capacity of the RC beam strengthened with CFRP and their results are compared with experimental ones. A revised formula that can give a better prediction for multi-layer CFRP strengthening members is also proposed. © Linwang et al.

关键词： Reinforced concrete

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Research On Slope Stability Analysis Method Based On Limit State Design Method Of Partial Coefficient

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IOP Conference Series: Earth and Environmental Science 2018年第2期189卷

作者： Bin Li China Key Laboratory of failure mechanism and safety control techniques of earth-rock dam of the Ministry of Water Resources Nanjing 210029 TianjinPort Engineering Institute Ltd. of CCCC First Harbor Engineering Company Ltd. Tianjin 30222 China Key laboratory of port geotechnical engineering ministry of communications PRC Tianjin 30222 China Key laboratory of port geotechnical engineering of Tianjin Tianjin 30222 China CCCC First Harbor Engineering Company Ltd. Tianjin 300461 China Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering Guilin University of Technology Guilin 541000 China

The arch dam design specification (SL282-2003) provides an allowable safety factor of 3.5 in abutment stability analysis, whether at the same safety level with value of 3.0 specified for gravity dams. The approach of 'Ratio of Safety Margin' can compare the safety factor with reliability index. The researches confirm that allowable reliability index of 4.45 and the allowable safety factor of 3.5 at the same level of risk control.

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Simulation And Analysis Of Interaction In Soft Clay Pile Foundation

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IOP Conference Series: Earth and Environmental Science 2018年第2期189卷

作者： Li bin Tianjin Port Engineering Institute Co. Ltd. of CCCC First Harbor Engineering Co. Ltd. Tianjin 300222 China Key Laboratory of Port Geotechnical Engineering Ministry of Communications PRC Tianjin 300222 China Key Laboratory of Tianjin Port Geotechnical Engineering Tianjin 300222 China CCCC First Harbor Engineering Company Ltd. Tianjin 300461 China China Key Laboratory of failure mechanism and safety control techniques of earth-rock dam of the Ministry of Water Resources Nanjing 210029 Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering Guilin University of Technology Guilin 541000 China

The single pile foundation is the most common forms of offshore wind turbine, but it is different from offshore oil platforms because of the load and the overturning moment. The elastic-plastic element of ABAQUS has been used to simulate failure modes of the single pile foundation in soft clay. The results shown that the single pile foundation has no plastic strain region under vertical load and has plastic strain under t horizontal load; in front of the pile, the single pile foundation has plastic strain region under bending moment load condition.

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Research On Analyzing Of Deep Excavation Under Seepage Condition

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IOP Conference Series: Earth and Environmental Science 2018年第5期189卷

The round excavation with high groundwater level is near to a building. The safety of excavation needs to take into account the geological conditions, the influence of groundwater level and the surrounding environment; combined with the excavation monitoring example, the finite element software is used to simulate the influence of seepage and the stability of the adjacent building, and the simulation results are used to guide the layout of the monitoring points and the optimization of the monitoring scheme; the simulation results show that the effective stress value increases when considering the seepage effect. A 19mm lateral displacement will occur at the top of the underground diaphragm wall adjacent to the building, and a 59mm settlement will occur at a distance of 10m from the top of an underground diaphragm wall. The pore water pressure of the soil will gradually dissipate as the construction progresses; the difference between monitoring results and calculation results is small. The finite element simulation considering the seepage effect can well simulate the excavation with high groundwater leve. It is suggested that the effective stress caused by the seepage flow should be consider when the excavation with high groundwater level.

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Experimental Study on Grouting Foundation Treatment of Immersed Tunnel

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Procedia engineering 2016年 166卷 317-325页

作者： Ke Li National Engineering Laboratory for Highway Tunnel Construction Technology Chongqing 400067 China Key Laboratory of Tunnel Construction and Maintenance Technology Ministry of Transport PRC Chongqing 400067 China China Merchants Chongqing Communications Research & Design Institute Co. Ltd. Chongqing 400067 China

Grouting method is one of foundation treatment methods of immersed tube tunnel, it has good effects on improvement of foundation strength and control of settlement deformation, but there is no mature method yet available for the determination of key technical parameters of foundation treatment by pressure grouting method and for the inspection and assessment of effects of treatment by pressure grouting method of immersed tube tunnel. In response to this problem, through model test, the influences of gradient, roughness, etc. of cushion layer of immersed tube tunnel on the effects of foundation treatment by pressure grouting method are researched and the method for inspection of effects of foundation treatment by pressure grouting method of immersed tube tunnel is proposed. The results show that: the changes of parameters of cushion layer regularly affect the effects of grouting by pressure grouting method and shall be considered in the design; the method combining ground penetrating radar and surface wave detection can effectively inspect the effects of foundation treatment.

关键词： Immersed tube tunnel foundation treatment pressure grouting method test research

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Adaptive Twisting Sliding Mode control for Overhead Cranes

Adaptive Twisting Sliding Mode Control for Overhead Cranes

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IEEE International Conference on Cyber technology in Automation, control, and Intelligent Systems

作者： Weimin Xu Yue Xu Xiang Zheng Key Laboratory of Marine Technology and Control Engineering Ministry of Communications of P. R. China Shanghai Maritime University

ISBN: (纸本)9781479987313

This paper analyzes the model of overhead cranes suffering from uncertain disturbances, then an adaptive twisting sliding mode control scheme for the underactuated overhead cranes with uncertainties is proposed. This method improves the robustness of the crane system by employing a time-varying sliding mode surface. Moreover, self-tuning laws for the twisting controller are developed to resist unknown disturbances exerted on the overhead crane systems. None of the prior information about the upper boundary of uncertainties is required in controller design. The finite time stability of the proposed controller is proven. Simulation study shows the performance of the suggested method.

关键词： Overhead crane Time-varying sliding mode Twisting sliding mode Adaptive control Uncertainties CRANE BRIDGE adaptive control Uncertainty Twisting torsion Variable structure systems time stability upper boundary controllers Cranes

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Development of safety, control and monitoring system for medium-speed marine diesel engine

Lecture Notes in Mechanical Engineering

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Lecture Notes in Mechanical engineering 2015年 19卷 697-704页

作者： Wang, Qinpeng Qin, Yihang Yang, Jianguo Yu, Yonghua He, Yuhai School of Energy and Power Engineering Wuhan University of Technology Wuhan430063 China Key Laboratory of Marine Power Engineering and Technology Under Ministry of Communications Wuhan430063 China

A local safety, control and monitoring system designed and implemented for medium-speed marine diesel engine is presented in the paper. The system consists of a control and monitoring sub-system, a safety sub-system and an online monitoring sub-system. The data exchange among the sub-system is conducted with the communication link of RS-485 interface. The hardware circuits and logical algorithm of the system are developed to achieve the functionalities in terms of diesel engine staring, stopping, fault shutdown protection, etc. The operating data of the diesel engine are captured in real time and the vital operational parameters and alarm messages are displayed with the nixie tubes and LED. As well, depending on the online monitoring sub-system, the control instruction and operational parameters could be monitored, analyzed and recorded. Additionally, a test platform is established to verify and validate the function of the system. Finally, the matching test between the system and the diesel engine is carried out via the experiment bench of MAN16/24 medium-speed diesel engine. The results show that the local safety, control and monitoring system works stable and the functions of the conventional control, parameter monitoring and alarming for the diesel engine meet the design requirement. © Springer International Publishing Switzerland 2015.

关键词： Diesel engines

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