4篇
您的检索式：作者名="Yangmin HE"
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| 1 | Soil pH impact on microbial tetraether lipids and terrestrial input index (BIT) in China显示文摘The distributions of microbial tetraether lipids i.e. glycerol dialkyl glycerol tetraethers (GDGTs) were investigated in a variety of Chinese soils featured by a wide range of pH values in different climate zones. The bacterial branched GDGTs and archaeal isoprenoid GDGTs were found to be widely distributed in Chinese soils and their relative abundance was controlled primarily by soil pH. The bacterial bGDGTs usually dominate over archaeal iGDGTs in abundance when the soil pH is below 8.0. However archaeal iGDGTs become dominant and the abundance of halophilic archaea characterized by GDGT V without cyclopentyl ring increases dramatically in the alkaline soil with pH greater than 8.0. The relative abundance of archaeal iGDGTs to bacterial bGDGTs was defined here as RAI index. The RAI index decreases with elevated soil pH and a linear correlation is found between them indicating that the relative abundance of archaeal iGDGTs to bacterial bGDGTs increases with increased pH. The RAI index thus could be a novel proxy of the pH values of paleosol. The terrestrial input index BIT (Branched and Isoprenoid Tetraethers Index) decreases with increased soil pH suggesting that soil pH should be taken into consideration when the terrestrial contribution to marine sediments is estimated by BIT index. Moreover the TEX86 index cannot be used to reconstruct sea surface temperature in the sediments featured by a large terrestrial input. | YANG Huan DING WeiHua WANG JinXiang JIN ChengSheng HE GangQiang QIN YangMin XIE ShuCheng | 2012 | Science China Earth Sciences2012，55，2： | 19 |
| 2 | Effect of Temperature and Ram Speed on Isothermal Extrusion for Large-size Tube with Piece-wing显示文摘Heat energy change during the extrusion of 7075 aluminium alloy large-size tube with piece-wing in a container was analyzed. Extrusion load vs ram displacement diagrams and exit temperature vs ram displacement diagrams at various speeds were obtained by 3D FEM simulation. Results show that the exit temperature becomes higher as the ram speed and displacement increase. For large-size tube with piece-wing, there is certainly a curve of ram speed decreasing with increasing ram displacement, which enables isothermal extrusion to be achieved. Therefore,an attempt was made to divide the working stroke into five different zones. Each of them has a preset speed that decreases from the ram displacement beginning to the ending. And then, new exit temperature vs ram displacement diagram was obtained by 3D FEM simulation for the five different speeds. It is shown that the variation of exit temperature is very small. Through the above research, a basic method for realizing isothermal extrusion of 7075large-size tube with piece-wing was obtained, that is, the working stroke was divided into several different zones with a decreasing speed during extrusion, each zones' speed was real-time adjusted on the feedback signal of exit temperature by proportional hydraulic valve through closed-loop control. The engineering experiment verification was carried out on 100 MN aluminium extrusion press with oil-driven double action. The experimental results of the exit temperature agrees with the simulation ones. The achievements of this study may serve as a significant guide to the practice of the relevant processes, particularly for isothermal extrusion. The verified method has been used in the design and manufacture of 125 MN aluminium extrusion press with oil-driven double action. | He YANG Jun ZHANG Yangmin HE Bingtao HAN | 2005 | Journal of Materials Science & Technology2005，21，4： | 5 |
| 3 | Analytical solution of a hyperbolic partial differential equation and its application显示文摘Purpose-The purpose of this paper is to investigate the analytical solution of a hyperbolic partial differential equation(PDE)and its application.Design/methodology/approach-The change of variables and the method of successive approximations are introduced.The Volterra transformation and boundary control scheme are adopted in the analysis of the reaction-diffusion system.Findings-A detailed and complete calculation process of the analytical solution of hyperbolic PDE(1)-(3)is given.Based on the Volterra transformation,a reaction-diffusion system is controlled by boundary control.Originality/value-The introduced approach is interesting for the solution of hyperbolic PDE and boundary control of the reaction-diffusion system. | Ping He Yangmin Li | 2017 | International Journal of Intelligent Computing and Cybernetics2017，10，2： | 0 |
| 4 | Control and synchronization of a hyperchaotic finance system via single controller scheme显示文摘Purpose–The purpose of this paper is to study the control and synchronization of the hyperchaotic finance system.Design/methodology/approach–A single controller scheme is introduced.The Routh-Hurwitz criteria and the structure of solution of first-order linear differential equations are adopted in analysis of control and synchronization.Findings–Two single controllers are designed and added to the new hyperchaotic finance system.The stability of the hyperchaotic finance system at its zero equilibrium point is guaranteed by applying the appropriate single controller signal based on Routh-Hurwitz criteria.Another effective controller is also designed for the global asymptotic synchronization on the hyperchaotic finance system based on the structure of solution of first-order linear differential equations.Numerical simulations are demonstrated to verify the effectiveness of the proposed single controller scheme.Originality/value–The introduced approach is interesting for control and synchronization the hyperchaotic finance system. | Ping He Yangmin Li | 2015 | International Journal of Intelligent Computing and Cybernetics2015，8，4： | 0 |
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