6篇
您的检索式：作者名="Yapu Zhang"
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| 1 | On the Development of an Effective Pressure Driving System for Ultra-Low Permeability Reservoirs显示文摘Given its relevance to the exploitation of ultra-low permeability reservoirs,which account for a substantial proportion of the world’s exploited and still unexploited reserves,in the present study the development of an adequate water injection system is considered.Due to the poor properties and weak seepage capacity of these reservoirs,the water injection pressure typically increases continuously during water flooding.In this research,the impact on such a process of factors as permeability,row spacing,and pressure gradient is evaluated experimentally using a high-pressure large-scale outcrop model.On this basis,a comprehensive evaluation coefficient is introduced able to account for the effective driving pressure. | Yapu Zhang Zhengming Yang Dajian Li Xuewei Liu Xinli Zhao | 2021 | Fluid Dynamics & Materials Processing2021，17，6： | 2 |
| 2 | Electromechanical model of RF MEMS switches 显示文摘 | Zhang LiXian Zhao YaPu | 2003 | Microsystem Technologies2003，，9： | 1 |
| 3 | Numerical and analytical study on the pull-in instability of micro-structure under electrostatic loading 显示文摘 | Zhang Yin Zhao YaPu | 2006 | Sensors and Actuators A2006，127，2： | 1 |
| 4 | Electromechinical model of RF MEMS switches显示文摘 | ZHANG Lixian ZHAO Yapu | 2003 | Microsystcm Technologies2003，9，6： | 1 |
| 5 | Adhesion of rough sur- faces with plastic deformation 显示文摘 | Zhang Lixian Zhao Yapu | 2004 | Journal of Adhe- sion Science and Technology2004，18，6： | 1 |
| 6 | Bicriteria Algorithms for Approximately Submodular Cover Under Streaming Model显示文摘In this paper,we mainly investigate the optimization model that minimizes the cost function such that the cover function exceeds a required threshold in the set cover problem,where the cost function is additive linear,and the cover function is non-monotone approximately submodular.We study the problem under streaming model and propose three bicriteria approximation algorithms.Firstly,we provide an intuitive streaming algorithm under the assumption of known optimal objective value.The intuitive streaming algorithm returns a solution such that its cover function value is no less thanα(1−ϵ)times threshold,and the cost function is no more than(2+ϵ)^(2)/(ϵ^(2)ω^(2))⋅κ,whereκis a value that we suppose for the optimal solution andαis the approximation ratio of an algorithm for unconstrained maximization problem that we can call directly.Next we present a bicriteria streaming algorithm scanning the ground set multi-pass to weak the assumption that we guess the optimal objective value in advance,and maintain the same bicriteria approximation ratio.Finally we modify the multi-pass streaming algorithm to a single-pass one without compromising the performance ratio.Additionally,we also propose some numerical experiments to test our algorithm’s performance comparing with some existing methods. | Yijing Wang Xiaoguang Yang Hongyang Zhang Yapu Zhang | 2023 | Tsinghua Science and Technology2023，28，6： | 0 |
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