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| 1 | Robustness analysis of underground powerhouse construction simulation based on Markov Chain Monte Carlo method显示文摘Scheduling is a major concern in construction planning and management, and current construction simulation research typically targets the shortest total duration. However, uncertainties are inevitable in actual construction, which may lead to discrepancies between the actual and planned schedules and increase the risk of total duration delay. Therefore, developing a robust construction scheduling technique is of vital importance for mitigating disturbance and improving completion probability. In the present study, the authors propose a robustness analysis method that involves underground powerhouse construction simulation based on the Markov Chain Monte Carlo(MCMC) method. Specifically, the MCMC method samples construction disturbances by considering the interrelationship between the states of parameters through a Markov state transition probability matrix, which is more robust and efficient than traditional sampling methods such as the Monte Carlo(MC) method. Additionally, a hierarchical simulation model coupling critical path method(CPM) and a cycle operation network(CYCLONE) is built, using which construction duration and robustness criteria can be calculated. Furthermore, a detailed measurement method is presented to quantize the robustness of underground powerhouse construction, and the setting model of the time buffer is proposed based on the MCMC method. The application of this methodology not only considers duration but also robustness, providing scientific guidance for engineering decision making. We analyzed a case study project to demonstrate the effectiveness and superiority of the proposed methodology. | ZHONG DengHua BI Lei YU Jia ZHAO MengQi | 2016 | Science China(Technological Sciences)2016，59，2： | 6 |
| 2 | Construction schedule risk analysis of high roller-compacted concrete dams based on improved CSRAM显示文摘The applied technology of high roller-compacted concrete(RCC) dams is quite complicated because of various risk factors, including the weather condition, supply of concrete aggregate, efficiency of transport machinery and dam surface machinery, and so on. In order to ensure the comprehensiveness, accuracy and objectivity of construction schedule risk analysis, a mathematical model called improved correlated schedule risk analysis model(CSRAM) is proposed in this paper. This model takes into account not only the construction features of high RCC dams, but also the stochastic variations of risk factors with the construction schedule, as well as their comprehensive effects. Using Monte Carlo method to solve this model enables the completion probability of a high RCC dam construction within plan time, and uncertainty analysis of risk factors. Compared with the conventional CSRAM, the improved CSRAM has higher completion probability and more convergent distribution of a simulation period, making analysis results more accurate and closer to actual engineering conditions. Among the ten risk factors selected, efficiency of dam surface machinery and proficiency of workers are found to be of the maximum uncertainty. | ZHONG DengHua YANG ShiRui CHANG HaoTian YU Jia YAN FuGen | 2015 | Science China(Technological Sciences)2015，58，6： | 5 |
| 3 | Heat-induced Internal Strain Relaxation and its Effect on the Microstructure of Polyacrylonitrile-based Carbon Fiber显示文摘The transformation of the internal strain and its effect on the microstructure of polyacrylonitrile-based carbon fiber during the high-temperature graphitization were investigated.The internal compressive strain within the carbon turbostratic structure was confirmed through a careful analysis by wide-angle X-ray diffraction and Raman spectroscopy.Heat-induced strain/stress relaxation along the fiber axis was observed and was found to have a profound effect on the structure of both the crystallites and microvoids.The results indicated that,the relaxation of residual strain changed the graphite layers from a wrinkled and distorted morphology to a straight and smooth one,and consequently led the crystallites to stack closely and orderly with increasing stack height.The strain relaxation also changed the morphology of crystallites and microvoids,resulting in an anisotropic growth for the latters. | Denghua Li Chunxiang Lu Gangping Wu Yu Yang Zhihai Feng Xiutao Li Feng An Baoping Zhang | 2014 | Journal of Materials Science & Technology2014，30，10： | 5 |
| 4 | Geological Conditions and Prospect Forecast of Shale Gas Formation in Qiangtang Basin, Qinghai-Tibet Plateau显示文摘The presence of shale gas has been confirmed in almost every marine shale distribution area in North America. Formation conditions of shale gas in China are the most favorable for marine, organic-rich shale as well. But there has been little research focusing on shale gas in Qiangtang Basin, Qinghai-Tibet Plateau, where a lot of Mesozoic marine shale formations developed. Based on the survey results of petroleum geology and comprehensive test analysis data for Qinghai-Tibet Plateau, for the first time, this paper discusses characteristics of sedimentary development, thickness distribution, geochemistry, reservoir and burial depth of organic-rich shale, and geological conditions for shale gas formation in Qiangtang Basin. There are four sets of marine shale strata in Qiangtang Basin including Upper Triassic Xiaochaka Formation(T3x), Middle Jurassic Buqu Formation(J2b), Xiali Formation(J2x) and Upper Jurassic Suowa Formation(J3s), the sedimentary types of which are mainly bathyal-basin facies, open platform-platform margin slope facies, lagoon and tidal-flat facies, as well as delta facies. By comparing it with the indicators of gas shale in the main U.S. basins, it was found that the four marine shale formations in Qiangtang Basin constitute a multi-layer distribution of organic-rich shale, featuring a high degree of thickness and low abundance of organic matter, high thermal evolution maturity, many kinds of brittle minerals, an equivalent content of quartz and clay minerals, a high content of feldspar and low porosity, which provide basic conditions for an accumulation of shale gas resources. Xiaochaka Formation shale is widely distributed, with big thickness and the best gas generating indicators. It is the main gas source layer. Xiali Formation shale is of intermediate thickness and coverage area, with relatively good gas generating indicators and moderate gas formation potential. Buqu Formation shale and Suowa Formation shale are of relatively large thickness, and covering a small area, with poor gas generating indicators, and limited gas formation potential. The shale gas geological resources and technically recoverable resources were estimated by using geologic analogy method, and the prospective areas and potentially favorable areas for Mesozoic marine shale gas in Qiangtang Basin are forecast and analyzed. It is relatively favorable in a tectonic setting and indication of oil and gas, shale maturity, sedimentary thickness and gypsumsalt beds, and in terms of mineral association for shale gas accumulation. But the challenge lies in overcoming the harsh natural conditions which contributes to great difficulties in ground engineering and exploration, and high exploration costs. | YU Yuanjiang ZOU Caineng DONG Dazhong WANG Shejiao LI Jianzhong YANG Hua LI Denghua LI Xinjing WANG Yuman HUANG Jinliang | 2014 | Acta Geologica Sinica(English Edition)2014，88，2： | 2 |
| 5 | Assessing the impact of climatic factors on potential evapotranspiration in droughts in North China显示文摘 | Jing Feng Denghua Yan Chuanzhe Li Fuliang Yu Cheng Zhang | 2013 | Quaternary International2013，，： | 1 |
| 6 | Preparation and characterization of ZnO/Ti02, S04/ ZnO/TiO2 photo-catalysts and their photdcatalysis 显示文摘 | Liao Shijun Huang Donggen Yu Denghua Su Yunlan Yuan Gaoqing | 2004 | Journal of Photochemistry and Photobiology A: Chemistry2004，1687，： | 1 |
| 7 | The Research Process of the Catalyst and Technics for Synthesis of B iodiesel 显示文摘 | YU Denghua | 2006 | Ind Catal2006，14，： | 1 |
| 8 | Multi-dimensional assessment of socioeconomic impacts of hydropower development—A case in the Upper Chuan River显示文摘The positive role of hydropower in climate change adaption is well accepted by the international community and has been highlighted many times,while the understanding of its impacts on socioeconomic development remains at the stage of rough estimation and qualitative description.The application of a multi-regional CGE model in this paper provides an effective tool for quantitatively assessing the socioeconomic impacts of hydropower development,reflecting its positive functions.This case study on the Upper Chuan River details the steps of model development,including impact mechanism analysis,regional delimitation,macro closure setting,shock selection,and database preparation.The results show the enormous economic benefits of hydropower development using various indicators such as consumption,investment,GDP,employment,and income.The study indicates that hydropower development is a win-win energy development mode which can help to realize the integration of sustainable development and climate change mitigation.Finally,potential improvements to the model are discussed. | LIU Yu MA Jing WANG Hao YAN DengHua LV YingKang DENG Wei | 2015 | Science China(Technological Sciences)2015，58，7： | 0 |
| 9 | Construction of Agricultural Circular Economy and Standard System in China显示文摘在在世界上倡导圆形的经济和低碳的经济的发展的新状况下面,农业正在面对所有挑战保证食物安全,处理气候变化,支持精力保存和污染减小,保护资源和环境,并且增加 farmers.Moreover 的收入,开发圆形的农业在国际挑战能被处理,在中国的农业的发展能是 accelerated.This pape | Hong Denghua,Zhang Shisheng,Zheng Yuyan,Tao Xueming Yu Xiaoying Engineer,Anhui Institute of Standardization Engineer, Deputy Director of Standards Research Center,Anhui Institute of Standardization, Engineer,Anhui Institute of Standardization, Engineer,Anhui Institute of Standardization, Engineer,Anhui Institute of Standardization, | 2010 | China Standardization2010，55，5： | 0 |
| 10 | Reconstructing proton channels via Zr-MOFs realizes highly ion-selective and proton-conductive SPEEK-based hybrid membrane for vanadium flow battery显示文摘There is an urgent need to break through the trade-off between proton conductivity and ion selectivity of proton exchange membrane(PEM)in vanadium flow battery(VFB).Proton channels in PEM are the key to controlling the ion sieving and proton conductivity in VFB.Herein,two types of proton channels are reconstructed in the hybrid membrane via introducing modified Zr-MOFs(IM-UIO-66-AS)into SPEEK matrix.Internal proton channels in IM-UIO-66-AS and interfacial proton channels between grafted imidazole groups on Zr-MOFs and SPEEK greatly improve the conductivity of the IM-UIO-66-AS/SPEEK hybrid membrane.More importantly,both reconstructed proton channels block the vanadium-ion permeation to realize enhanced ion selectivity according to the size sieving and Donnan exclusion effects,respectively.Moreover,the hybrid membrane exhibits good mechanical property and dimensional stability.Benefiting from such rational design,a VFB loading with the optimized membrane exhibits enhanced voltage efficiency of 79.9%and outstanding energy efficiency of 79.6%at 200 m A cm^(-2),and keeps a notable cycle stability for 300 cycles in the long-term cycling test.Therefore,this study provides inspiration for preparing next-generation PEMs with high ion selectivity and proton conductivity for VFB application. | Denghua Zhang Wenjie Yu Yue Zhang Sihan Cheng Mingyu Zhu Shuai Zeng Xihao Zhang Yifan Zhang Chao Luan Zishen Yu Lansong Liu Kaiyue Zhang Jianguo Liu Chuanwei Yan | 2022 | Journal of Energy Chemistry2022，，12： | 0 |
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