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Investigation of the 5.12 Wenchuan Earthquake damages to the Zipingpu Water Control Project and an assessment of its safety state

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Science China(Technological Sciences) 2009年第4期52卷 820-834页

作者： GUAN ZhiCheng Water Resources and Hydropower planning & design General institute, beijing100120, China Water Resources and Hydropower planning & design General institute

On May 12, 2008, a major earthquake measured 8 on the Richter scale jolted Wenchuan County in Si- chuan Province, China with the epicentral intensity of XI degrees. Zipingpu Dam is located 17.17 km from the epicenter and the influence intensity at the damsite reached IX―X degrees. It is the first time in the world for such a high concrete-faced rockfill dam (CFRD) in China to experience such a strong earthquake occurring in such a short distance. Due to its location of special importance to the down- stream areas, the safety state and damaging condition of the Zipingpu Dam has attracted great atten- tions from various circles. Based on site investigation of the damages to the Zipingpu Dam and com- parison analysis of the observation data obtained before and after the earthquake, the paper makes a comprehensive assessment of the key technical issues relevant to this high CFRD, including its safety state and the high slope stability after the earthquake.

关键词： earthquake earthquake damage investigation concrete-faced rockfill dam dam project safety state Zipingpu Dam

City planning and SocioEconomic Development——Also on the Further Implementation of the Master Plan for beijing Development

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China City planning Review 1991年第2期8卷 3-14页

作者： Zhang Jinggan beijing institute of urban planning and design

At present,many people believe that wehave to strengthen the research on socioeconomic development when making citydevelopment plans,but problems remain asto what to research on,how to carry out theresearch and how to... 详细信息

关键词： City planning and SocioEconomic Development Also on the Further Implementation of the Master Plan for beijing Development

Reinforcement Learning-Based Dynamic Order Recommendation for On-Demand Food Delivery

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Tsinghua Science and Technology 2024年第2期29卷 356-367页

作者： Xing Wang Ling Wang Chenxin Dong Hao Ren ke Xing Department of Automation Tsinghua UniversityBeijing 100080China School of Mechanical and Automotive Engineering Qingdao Hengxing University of Science and TechnologyQingdao 266100China Meituan Beijing 100015China

On-demand food delivery(OFD)is gaining more and more popularity in modern *** a kernel order assignment manner in OFD scenario,order recommendation directly influences the delivery efficiency of the platform and the delivery experience of *** paper addresses the dynamism of the order recommendation problem and proposes a reinforcement learning solution *** actor-critic network based on long short term memory(LSTM)unit is designed to deal with the order-grabbing conflict between different ***,three rider sequencing rules are accordingly proposed to match different time steps of the LSTM unit with different *** test the performance of the proposed method,extensive experiments are conducted based on real data from Meituan delivery *** results demonstrate that the proposed reinforcement learning based order recommendation method can significantly increase the number of grabbed orders and reduce the number of order-grabbing conflicts,resulting in better delivery efficiency and experience for the platform and riders.

关键词： on-demand food delivery order recommendation reinforcement learning actor-critic network long short term memory

Energy Supply Programme of beijing

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China City planning Review 1993年第4期10卷 20-22页

作者： Wu Xumin beijing institute of urban planning and design

Under the general plan of beijing approved in princi-ple by the State Council in 1983,considerable progress hasbeen made in the supply of electricity,central heating,gas,coal and so on in the past ten ***,due tothe rapid economic development and the enhancement ofthe living standard,shortages in the supply of electricity,thermal energy,gas and other high quality energy is still *** the constant increase in the amount

关键词： Energy Supply Programme of beijing

Water Resources in beijing

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China City planning Review 1993年第4期10卷 15-19页

作者： Luo Tingdong beijing institute of urban planning and design

Water is a substance that man and all other living be-ings rely on and is not *** is also indispensablefor industry and *** is a city which lacks *** the continuousdevelopment of the city,the demand for water will be *** order to ensure all the undertakings of thecity going on smoothly and maintain a good ecological envi-ronment,one of the most important tasks of the revisedGeneral City Plan is to deal with the problem of water sup-ply in a proper way.

关键词： Be In Water Resources in beijing

An Exploration of the Thinking and Method of the Revision of beijing's Master planning

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China City planning Review 1993年第4期10卷 7-9页

作者： Cao Lianqun beijing institute of urban planning and design

This article introduces the new thinking andmethod of the revision of beijing’s master *** plannersmade new exploration and breakthroughs in such aspects asthe involvement of the general public in planning,the intro-duction of value concept,unified planning of both urban andrural areas,how to link with the future goals of development,etc.

关键词： Be Rev An Exploration of the Thinking and Method of the Revision of beijing’s Master planning

Two Strategic Diversions in the urban Development of beijing

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China City planning Review 1993年第4期10卷 10-14页

作者： Zhang Jinggan beijing institute of urban planning and design

In view of a good deal of problems which arise in thespeedy urban development of the beijing Municipality and demand forprompt solution,this article puts forward two strategic diversions in theurban development of beijing,*** diversion of the stress of urban de-velopment from the urban districts to the outer suburbs and the diver-sion of the development of urban districts from concentric sprawl tooverall readjustment and *** is also a strategic guidingideology for the revision of the General *** article puts for-ward tentative ideas in detail.

关键词： Be Two Strategic Diversions in the urban Development of beijing

Driver at 10 MJ and 1 shot/30 min for inertial confinement fusion at high gain:Efficient,compact,low-cost,low laser-plasma instabilities,beam color selectable from 2ω/3ω/4ω,applicable to multiple laser fusion schemes

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Matter and Radiation at Extremes 2024年第4期9卷 4-7页

作者：隋展蓝可 Shanghai institute of Laser Plasma China Academy of Engineering PhysicsShanghai 201800China instituteof Applied Physics and Computational Mathematics Beijing 100094China

The achievement of ignition at the National Ignition Facility(NIF)has prompted a global wave of further research on inertial fusion energy(IFE).However,IFE requires a target gain G of 30-100,and it is hard to achieve fusion at such high gain with the energy,configuration,and technical approach of the ***,we present a conceptual design for a next-generation laser driver that is applicable to multiple laser fusion schemes and provides 10 MJ,2-3 PW at 3ω(or 2ω,in which case the energy and power can be higher),and one shot per 30 min,with the aim of achieving G>*** is also efficient,compact,and low in cost,and it has low susceptibility to laser-plasma instabilities.

关键词： applicable compact instabilities

Numerical Simulation on Radon Retardation Behavior of Covering Floats in Radon-Containing Water

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Biomedical and Environmental Sciences 2024年第4期37卷 406-417页

作者： LIU Shu Yuan ZHANG Li YE Yong Jun DING Ku ke National institute for Radiological Protection Chinese Center for Disease Control and PreventionBeijing 100088China Office for Public Health Management Chinese Center for Disease Control and PreventionBeijing 102206China key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy University of South ChinaHengyang 421001HunanChina

Objective This study aimed to efficiently reduce the release of radon from water bodies to protect the *** Based on the sizes of the experimental setup and modular float,computational fluid dynamics(CFD)was used to assess the impact of the area coverage rate,immersion depth,diffusion coefficient,and radon transfer velocity at the gas–liquid interface on radon migration and exhalation of radon-containing *** on the numerical simulation results,an estimation model for the radon retardation rate was *** effectiveness of the CFD simulation was evaluated by comparing the experimental and simulated variation values of the radon retardation rate with the coverage area *** The effect of radon transfer velocity on radon retardation in water bodies was minor and insignificant according to the appropriate value;therefore,an estimation model of the radon retardation rate of the coverage of a radon-containing water body was constructed using the synergistic impacts of three factors:area coverage rate,immersion depth,and diffusion *** deviation between the experimental and simulated results wasdesigning covering floats for radon retardation in radoncontaining water.

关键词： Radon-containing water Radon retardation rate CFD Coverage experiment Optimized design