Calculation and analysis of diversion tunnel structure based on ANSYS

2021 ◽  
Author(s):  
Du Wu ◽  
Gaohui Li ◽  
Xuesong Yu ◽  
Ruicun Zhao ◽  
Lifa Ba
Keyword(s):  
Tunnel Structure ◽  
Diversion Tunnel

Potassium Pre-Inserted K1.04Mn8O16 Cathode Materials for Aqueous Li-Ion and Na-Ion Hybrid Capacitors

2019 ◽  
Author(s):  
Yamin Zhang ◽  
Lina Chen ◽  
Chongyang Hao ◽  
Xiaowen Zheng ◽  
Yixuan Guo ◽  
...  
Keyword(s):  
Cycling Performance ◽  
High Energy ◽  
High Energy Density ◽  
Potassium Ions ◽  
Tunnel Structure ◽  
Hybrid Supercapacitor ◽  
Hybrid Supercapacitors ◽  
Li Ion ◽  
Power Densities ◽  
Hybrid Capacitors

For the applications of aqueous Li-ion hybrid capacitors and Na-ion hybrid capacitors, potassium ions are pre-inserted into MnO<sub>2</sub> tunnel structure, the as-prepared K<sub>1.04</sub>Mn<sub>8</sub>O<sub>16</sub> materials consist of <a>nanoparticles</a> and nanorods were prepared by facile high-temperature solid-state reaction. <a></a>The as-prepared materials were well studied andthey show outstanding electrochemical behavior. We assembled hybrid supercapacitors with commercial activated carbon (YEC-8A) as anode and K<sub>1.04</sub>Mn<sub>8</sub>O<sub>16 </sub>as cathode. It has high energy densities and power densities. Li-ion capacitors reach a high energy density of 127.61 Wh kg<sup>-1 </sup>at the power density of 99.86 W kg<sup>-1</sup> and Na-ion capacitor obtains 170.96 Wh kg<sup>-1 </sup>at 133.79 W kg<sup>-1</sup>. In addition, the <a>hybrid supercapacitor</a>s demonstrate excellent cycling performance which maintain 97 % capacitance retention for Li-ion capacitor and 85 % for Na-ion capacitor after 10,000 cycles.

Shaking Table Model Test of Loess Tunnel Structure under Rainfall

2021 ◽  
Author(s):  
Xinhai Zhou ◽  
Xuansheng Cheng ◽  
Lei Qi ◽  
Ping Wang ◽  
Shaofeng Chai ◽  
...  
Keyword(s):  
Model Test ◽  
Shaking Table ◽  
Tunnel Structure ◽  
Table Model ◽  
Shaking Table Model Test

scholarly journals Numerical study on temperature distribution of tunnel structure in fires

2021 ◽  
Vol 25 ◽  
pp. 100874
Author(s):  
Xin Xu ◽  
Guoqing Zhu ◽  
Xiaojin Zhang ◽  
Guoqiang Chai ◽  
Tianwei Chu
Keyword(s):  
Temperature Distribution ◽  
Numerical Study ◽  
Tunnel Structure

A New Tunnel-Type V4O9 Cathode for High Power Density Aqueous Zinc Ion Batteries

2021 ◽  
Author(s):  
Qiaoran Wang ◽  
Tianjiang Sun ◽  
Shibing Zheng ◽  
Lin Li ◽  
Tao Ma ◽  
...  
Keyword(s):  
Power Density ◽  
Vanadium Pentoxide ◽  
High Power ◽  
Room Temperature ◽  
Zinc Ion ◽  
High Power Density ◽  
Tunnel Structure

The mixed valences V4O9 with tunnel structure and room temperature metallic properties are prepared via partially reducing vanadium pentoxide. The unique tunnel structure and metallic characteristics are beneficial to the...

Stability Analysis of Hydropower Stations With Complex Flow Patterns in the Tailrace Tunnel

2013 ◽  
Author(s):  
Jianxu Zhou ◽  
Fulin Cai ◽  
Ming Hu
Keyword(s):  
Free Surface ◽  
Stability Analysis ◽  
Flow Patterns ◽  
Normal Operation ◽  
Complex Flow ◽  
Diversion Tunnel ◽  
Implicit Model ◽  
Special Cases ◽  
Tailrace Tunnel ◽  
Hydropower Stations

For some special tailrace tunnels in the hydropower stations, including the changing top-altitude tailrace tunnel and the tailrace tunnel with downstream reused flat-ceiling diversion tunnel, during normal operation and hydraulic transients, the flow patterns inside are relatively complex mainly including the free-surface pressurized flow and partial free flow if the tail water level is lower than the top elevation of tunnel’s outlet. These complex flow patterns have obvious effect on system’s stability, and can not be simulated accurately by the traditional models. Therefore, a characteristic implicit model is introduced to simulate these complex flow patterns for further stability analysis. In some special cases, the characteristic implicit model also fails to completely simulate the mixed free-surface pressurized flow in the flat-ceiling tailrace tunnel. A new method is presented based on both experimental research and numerical simulation, and then, system’s stability is analyzed by compared with traditional ordinary boundary condition. The results indicate that, with different simulation models for the complex water flow in the tailrace tunnel, system’s dynamic characteristic can be actually revealed with the consideration of the effect of complex flow patterns in the tailrace tunnel on system’s stability and regulation performance.

The tunnel structure of blind mole rats (genusSpalax) in Turkey

2010 ◽  
Vol 50 (1) ◽  
pp. 35-40 ◽  
Author(s):  
Tuba Yağcı ◽  
Yüksel Coşkun ◽  
Nursel Aşan
Keyword(s):  
Tunnel Structure
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