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delayed response model for bankfull discharge predictions in the Yellow River

International Journal of Sediment Research 2011年第4期26卷 445-459页

作者： Baosheng WU and Lingyun LI 1 Prof.,State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China, 2 Ph.D.and Research Hydraulic Engineer,Changjing River Scientific Research Institute,Wuhan 430010,China Prof. State Key Laboratory of Hydroscience and Engineering Tsinghua University Beijing 100084 China Ph.D. and Research Hydraulic Engineer Changjing River Scientific Research Institute Wuhan 430010 China

delayed response means that channels cannot achieve a new equilibrium state immediately following disruption;the channel requires a response time or relaxation time to reach *** follows that the morphological state of fluvial system represents the cumulative effects of all previous disturbances and environmental conditions.A unique feature of the delayed response model for bankfull discharge is that the model is capable of representing the cumulative effects of all previous flow conditions when applied to predict the path/trajectories of bankfull discharge in response to altered flow *** this paper,the delayed response model was modified by readjusting the weight for the initial boundary conditions and introducing a variableβwith respect to *** modified model was then applied to the bankfull discharge calculations for three selected river reaches of the Yellow River,with each reach having different geomorphic settings and constraints. Results indicated that the modified model can predict accurately the bankfull discharge variation in response to changes in flow discharge and sediment load conditions that have been dramatically altered in the *** also demonstrated the strong dependence of current bankfull discharge on the previous years’ flow conditions,with the relaxation time varied from 2 to 14 years,meaning that the bankfull discharge was not only affected by the flow discharge and sediment load in the current year,but also by those in previous 1 to 13 ***,the relaxation time of bankfull discharge adjustment was inversely proportional to the long-term average suspended sediment concentrations,and this may be explained by fact that high sediment concentrations may have a high potential to perform geomorphic work and there is more sediment readily available to shape the channel boundary and geometry.

关键词： Yellow River Bankfull discharge delayed response Flow discharge Sediment load Relaxation time

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delayed response to the photovoltaic performance in a double quantum dots photocell with spatially correlated fluctuation

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Chinese Physics B 2023年第5期32卷 610-618页

作者：祝胜男赵顺才许路昕陈林杰 Department of Physics Faculty of ScienceKunming University of Science and TechnologyKunming 650500China Center for Quantum Materials and Computational Condensed Matter Physics Faculty of ScienceKunming University of Science and TechnologyKunming 650500China

A viable strategy for enhancing photovoltaic performance is to comprehend the underlying quantum physical regime of charge transfer in a double quantum dots(DQD) photocell. This work explored the photovoltaic performance dependent spatially correlated fluctuation in a DQD photocell. The effects of spatially correlated fluctuation on charge transfer and output photovoltaic efficiency were explored in a proposed DQD photocell model. The results revealed that the charge transport process and the time to peak photovoltaic efficiency were both significantly delayed by the spatially correlated fluctuation, while the anti-spatially correlated fluctuation reduced the output peak photovoltaic efficiency. Further results revealed that the delayed response could be suppressed by gap difference and tunneling coefficient within two dots. Subsequent investigation demonstrated that the delayed response was caused by the spatial correlation fluctuation slowing the generative process of noise-induced coherence, which had previously been proven to improve the quantum photovoltaic performance in quantum photocells. And the reduced photovoltaic properties were verified by the damaged noise-induced coherence owing to the anti-spatial correlation fluctuation and a hotter thermal ambient environment. The discovery of delayed response generated by the spatially correlated fluctuations will deepen the understanding of quantum features of electron transfer, as well as promises to take our understanding even further concerning quantum techniques for high efficiency DQD solar cells.

关键词： delayed response spatially correlated fluctuation double quantum dots photocell

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Flow separation control over an airfoil using continuous alternating current plasma actuator

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Chinese Physics B 2021年第3期30卷 346-355页

作者： Jian-Guo Zheng School of Aerospace Engineering Huazhong University of Science and TechnologyWuhan 430074China

The flow separation control over an NACA 0015 airfoil using continuous alternating current(AC)dielectric barrier discharge(DBD)plasma actuator is investigated experimentally and *** work is intended to report some observations made from our experiment,to which little attention is paid in the previous studies,but which is thought to be important to the understanding of control of complex flow separation with AC *** this end,the response of separated flow to AC plasma actuation is visualized through the time-resolved particle image velocimetry(PIV)measurement,whereas numerical simulation is carried out to complement the *** flow control process at chord-based Reynolds number(Re)of 3.31×105 is *** is found that the response of external flow to plasma forcing is delayed for up to tens of milliseconds and the delay time increases with angle of attack *** observed is that at the intermediate angle of attack near stall,the forced flow features a well re-organized flow ***,for airfoil at high post-stall angle of attack,the already well suppressed flow field can recover to the massively separated flow state and then reattach to airfoil surface with the flow pattern fluctuating between the two states in an irregular *** is contrary to one’s first thought that the forced flow at any angles of attack will become well organized and regular,and reflects the complexity of flow separation control.

关键词： dielectric barrier discharge plasma actuator alternating current plasma discharge flow separation flow control delayed response

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