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| 1 | Singular value diagnosis in dam safety monitoring effect values显示文摘Based on the principal component analysis, principal components that have major influence on data variance are determined by the energy percentage method according to the correlation between monitoring effects. Then principal components are extracted through reconstructing multi effects. Moreover, combining with the optimal estimation theory, the method of singular value diagnosis in dam safety monitoring effect values is proposed. After dam monitoring information matrix is obtained, single effect state estimation matrix and multi effect fusion estimation matrix are constructed to make diagnosis on singular values to reduce false alarm rate. And the diagnosis index is calculated by PCA. These methods have already been applied to an actual project and the result shows the ability of the monitoring effect reflecting dam evolution behavior is improved as dam safety monitoring effect fusion estimation can take accurate identification on singular values and achieve data reduction, filter out noise and lower false alarm rate effectively. | GU ChongShi ZHAO ErFeng JIN Yi SU HuaiZhi | 2011 | Science China(Technological Sciences)2011，54，5： | 8 |
| 2 | Water discharge changes of the Changjiang River downstream Datong during dry season显示文摘Based on hydrometric data and extensive investigations on water-extracting projects, this paper presents a preliminary study on water discharge changes between Datong and Xuliujing during dry season. The natural hydrological processes and human factors that influence the water discharge are analyzed with the help of GIS method. The investigations indicate that the water-extracting projects downstream from Datong to Xuliujing had amounted to 64 in number by the end of 2000, with a water-extracting capacity up to 4,626 m 3 /s averaged in a tidal cycle. The water extraction from the Changjiang River has become the most important factor influencing the water discharge downstream Datong during dry season. The potential magnitude in water discharge changes are estimated based on historical records of water extraction and a water balance model. The computational results were calibrated with the actual data. The future trend in changes of water discharge into the sea during dry season was discussed by taking into consideration of newly built hydro-engineering projects. The water extraction downstream Datong in dry season before 2000 had a great influence on discharges into the sea in the extremely dry year like 1978-1979. It produced a net decrease of more than 490 m 3 /s in monthly mean discharges from the Changjiang into the sea. It is expected that the water extraction will continually increase in the coming decades, especially in dry years, when the net decrease in monthly mean water discharge will increase to more than 1000 m 3 /s and will give a far-reaching effect on the changes of water discharge from the Changjiang into the sea. | ZHANG Erfeng,CHEN Xiqing,WANG Xiaoli(State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China) | 2003 | Journal of Geographical Sciences2003，13，3： | 2 |
| 3 | Effect of re- turn inlet on thermal stratieation in a rocket tank显示文摘 | Cheng Xianghua Li Yanzhong Chen Erfeng | 2010 | Journa1 of Thermophysics and Heat Transfer2010，24，1： | 1 |
| 4 | CFD simulation of upward subcooled boiling flow of refrigerant-ll3 using the two-fluid model 显示文摘 | CHEN Erfeng LI Yanzhong CHENG Xianghua | 2009 | Applied Thermal Engineering2009，，29： | 1 |
| 5 | CFD simulation of upward subcooled boiling flow of refrigerant-113 using the two-fluid model显示文摘 | CHEN Erfeng LI Yanzhong CHENG Xianghua | 2009 | Applied Thermal Engineering2009，29，1112： | 1 |
| 6 | Geochemistry and Zircon U-Pb Geochronology of Early Paleozoic S-type Granites in the Eastern Qilian Block,Northwest China显示文摘The Qilian Block(QB)is a Precambrian micro-continent located in the northeastern Qinghai–Tibet Plateau.Prevalent Lower Paleozoic granitic magmatic rocks crop out in the QB.A new integrated study of zircon U-Pb ages and systematic whole-rock geochemical data for the Xindian,Dongjiazhuang and Xiaogaoling granites in the eastern segment of the QB constrains their emplacement ages,petrogenesis,and regional evolutionary history.U-Pb dating reveals that the Xindian granite was emplaced 454 Ma,and both the Dongjiazhuang and Xiaogaoling granites were emplaced ca.440 Ma.Geochemical study shows that all granites belong to the high-K calc-alkaline to shoshonitic series and are S-type granites formed by partial melting of continental crust,mainly metagraywacke.We infer that these ca.454–445 Ma granites formed in a syn-collisional setting during the continental collisional between the Qaidam and Qilian blocks. | LIU Xiuting LI Binkai HAN Jilong REN Erfeng GAO Donglin DU Yongsheng REN Qianhui ZHANG Yan | 2021 | Acta Geologica Sinica(English Edition)2021，95，2： | 1 |
| 7 | 基于声波理论的氧输送系统低频脉动特性数值研究显示文摘Aiming at the low-frequency pressure fluctuation phenomena in certain liquid oxygen delivery systems during dual engine operation,a numerical study on the intrinsic frequency of the liquid oxygen delivery system was conducted by adopting an acoustic unit in Abaqus.Factors such as condensation characteristics of the oxygen-enriched gas gas in the liquid oxygen’s pipeline between pumps,flexibility of the accumulator,and cavitation flexibility of the engine were considered in the simulation models.The simulation results show that the second order frequency of the liquid oxygen delivery system is 8.77 Hz,and the phase difference of the corresponding acoustic modal is 180°,which is the liquid circuit frequency of the small loop between the two branches of the tee.This is consistent with the low-frequency fluctuation phenomenon during flight.Moreover,the simulation results were consistent with the liquid circuit frequency solved via the transfer matrix,which also verified the effectiveness of the frequency analysis method based on acoustic theory. | CHEN Erfeng ZHENG Maoqi FANG Hongrong XUE Lipeng MA Fei | 2021 | Aerospace China2021，22，2： | 1 |
| 8 | Human impacts on the Changjiang (Yangtze) River basin,China,with special reference to the impacts on the dry season water discharges into the sea显示文摘 | Chen Xiqing Zong Yongqiang Zhang Erfeng | 2001 | Geomorphology2001，41，： | 1 |
| 9 | Human impacts on the Changjiang (Yangtze) River basin, China, with special reference to the impacts on the dry season water discharges into the sea显示文摘 | Chen Xiqing Zong Yongqiang Zhang Erfeng | 2001 | Geomorphology2001，41，： | 1 |
| 10 | Pressure wave propagation characteristics in a two-phase flow pipeline for liquid-propellant rocket显示文摘 | Yanzhong Li Cui Li Erfeng Chen Yuanyuan Ying | 2010 | Aerospace Science and Technology2010，，6： | 1 |
| 11 | Analytical solution for salt intrusion in the Yangtze estuary, China显示文摘 | ZHANG Erfeng SAVENIJE H H G WU Hui | 2011 | Estuarine Coastal and Shelf Science2011，91，4： | 1 |
| 12 | Multi-dimensional database design and implementation of dam safety monitoring system显示文摘To improve the effectiveness of dam safety monitoring database systems,the development process of a multi-dimensional conceptual data model was analyzed and a logic design was achieved in multi-dimensional database mode.The optimal data model was confirmed by identifying data objects,defining relations and reviewing entities.The conversion of relations among entities to external keys and entities and physical attributes to tables and fields was interpreted completely.On this basis,a multi-dimensional database that reflects the management and analysis of a dam safety monitoring system on monitoring data information has been established,for which factual tables and dimensional tables have been designed.Finally,based on service design and user interface design,the dam safety monitoring system has been developed with Delphi as the development tool.This development project shows that the multi-dimensional database can simplify the development process and minimize hidden dangers in the database structure design.It is superior to other dam safety monitoring system development models and can provide a new research direction for system developers. | Zhao Erfeng Wang Yachao Jiang Yufeng Zhang Lei Yu Hong | 2008 | Water Science and Engineering2008，1，3： | 1 |
| 13 | Effect of return inlet on thermal stratification in a rocket tank 显示文摘 | Cheng Xianghua Li Yanzhong Chen Erfeng Li Cui | 2010 | Journal of Thermophysics and Heat Transfer2010，24，1： | 1 |
| 14 | Analytical behavior of eccentrically loaded concrete encased steel columns subjected to standard fire including cooling phase 显示文摘 | Du Erfeng Shu Ganping Mao Xiaoyong | 2013 | International Journal of Steel Structures2013，13，1： | 1 |
| 15 | Effect of return inlet on thermal stratification in a rocket tank显示文摘 | Cheng Xianghua Li Yanzhong Chen Erfeng | | 0，，01： | 1 |
| 16 | CFD simulation of upward subcooled boiling flow of refrigerant-113 using the two-fluid model显示文摘 | Erfeng Chen Yanzhong Li Xianghua Cheng | 2008 | Applied Thermal Engineering2008，，11： | 1 |
| 17 | Human impacts on the Changjiang (Yangtze) River basin, China, with special reference to the impacts on the dry season water discharges into the sea显示文摘 | Xiqing Chen Yongqiang Zong Erfeng Zhang Jiangang Xu Shijie Li | 2001 | Geomorphology2001，，2： | 1 |
| 18 | A preliminary analysis of human impacts on sediment discharges from the Yangtze, China, into the sea显示文摘 | Chen Xiqing Zhang Erfeng Mu Hongqiang | 2005 | Journal of Coastal Research2005，21，3： | 1 |
| 19 | Human impacts on the Changjiang Yangtze River basin, China with respect reference to the impacts on the dry season water discharges into the sea显示文摘 | Chen Xiqing Zon Yongqiangg Zhang Erfeng | 2001 | Geomorphology2001，41，： | 1 |
| 20 | Effect of return inlet on thermal stratification in a rocket tank显示文摘 | Cheng Xianghua Li Yanzhong Chen Erfeng | 2010 | Journal of Thermo-physics and Heat Transfer2010，24，1： | 1 |
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