5篇
您的检索式：作者名="Zhang Dayou"
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| 1 | CFD-DEM simulation of three-dimensional aeolian sand movement显示文摘A three-dimensional CFD-DEM model is proposed to investigate the aeolian sand movement.The results show that the mean particle horizontal velocity can be expressed by a power function of heights.The probability distribution of the impact and lift-off velocities of particles can be described by a log-normal function,and that of the impact and lift-off angles can be expressed by an exponential function.The probability distribution of particle horizontal velocity at different heights can be described as a lognormal function,while the probability distribution of longitudinal and vertical velocity can be described as a normal function.The comparison with previous two-dimensional calculations shows that the variations of mean particle horizontal velocity along the heights in two-dimensional and three-dimensional models are similar.However,the mean particle density of the two-dimensional model is larger than that in reality,which will result in the overestimation of sand transportation rate in the two-dimensional calculation.The study also shows that the predicted probability distributions of particle velocities are in good agreement with the experimental results. | YANG JieCheng,ZHANG Yu *,LIU DaYou & WEI XiaoLin Key Laboratory of Environmental Mechanics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China | 2010 | Science China(Physics,Mechanics & Astronomy)2010，53，7： | 3 |
| 2 | Sand storms:CFD analysis of Reynolds stress and collision stress of particles near sand bed显示文摘Sand storm is a serious environmental threat to humans.Sand particles are transported by saltation and suspension,causing soil erosion in one place and deposition in another.In order to prevent and predict sand storms,the causes and the manners of particle motions must be studied in detail.In this paper a standard k-ε model is used for the gas phase simulation and the discrete element method(DEM) is used to predict the movements of particles using an in-house procedure.The data are summarized in an Eulerian-Eulerian regime after simulation to get the statistical particle Reynolds stress and particle collision stress.The results show that for the current case the Reynolds stress and the air shear stress predominate in the region 20-250 mm above the initial sand bed surface.However,in the region below 3 mm,the collision stress must be taken into account in predicting particle movement. | Yu Zhang Jiecheng Yang Dayou Liu Xiaolin Wei Lixin Yu | 2010 | Particuology2010，8，4： | 2 |
| 3 | Iron-Catalyzed Primary C-H Amination of Sulfamate Esters and Its Application in Synthesis of Azetidinest显示文摘of main observation and conclusion The direct amination of unactivated primary C-H bonds is extremely challenging due to their inert nature.Herein,we report an intramolecular primary C-H amination of sulfamate esters using an iron catalyst derived from iron(Ⅱ)triflate and bipyridine.An array of oxathiazinanes were synthesized in moderate to good yields,which were further converted into biologically important azetidines by a one-pot procedure.This research demonstrates the potential of applying simple nitrogen ligands in iron-catalyzed C-H functionalization and offers an accessible alternative to state-of-the-art iron-nitrene chemistry. | Yan Zhang Dayou Zhong Muhammad Usman Peng Xue Wen-Bo Liu | 2020 | Chinese Journal of Chemistry2020，38，12： | 1 |
| 4 | Double tail fin type analysis research and development显示文摘 | Zhang Dayou Zhu Tao Li Shaobo | 2006 | Marine engineering2006，，6： | 1 |
| 5 | A method of rule match conflict resolution for product configuration in manufac tttre显示文摘 | Niya Li Dayou Liu Jian Zhang Yuhua Chen | 2009 | International Journal of Computer Integrated Manufac turing2009，22，3： | 1 |
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