Results 51 to 60 of about 4,896,138 (240)

Ground-source heat pumps and underground thermal energy storage: energy for the future [PDF]

, 2008
We need energy for space heating—but in most cases not where or when energy sources are available. Energy storage, which helps match energy supply and demand, has been practised for centuries, also in Norway.
Banks, D., Kalskin Ramstad, R., Midttømme, K., Skarphagen, H., Sæther, O.M.   +4 more
core  

Transient Frequency Stability Emergency Control for the Power System Interconnected With Offshore Wind Power Through VSC-HVDC

IEEE Access, 2020
For the power system interconnected with the large-scale offshore wind power through VSC-HVDC, such as SZ power grid, it may be engaged with transient frequency stability and lack of related control due to the randomness, fluctuation and intermittence of
Ancheng Xue, Jiahuan Zhang, Lijun Zhang, Yikai Sun, Jiehao Cui, Jiawei Wang   +5 more
doaj   +1 more source

A pilot protection method for the transmission line of wind farm-flexible DC system based on high-frequency inductance difference coefficients

International Journal of Electrical Power & Energy Systems
Conventional protection schemes for wind farm-flexible flexible direct current (DC) system transmission lines are susceptible to malfunctions in external fault scenarios and exhibit limited immunity to fault resistance in internal fault scenarios. In the
Jing Ma, Zhuoer Gao, Guojie Xu, Jie Li, Kun Qian, Yufeng Zhao   +5 more
doaj   +1 more source

UHECR observations and lensing in the magnetic field of the Virgo cluster

, 2008
We discuss how lensing by magnetic fields in galaxy clusters affects ultrahigh energy cosmic ray (UHECR) observations. As specific example, we use Virgo together with the cluster magnetic fields obtained earlier in a constrained simulation of structure ...
, A. Cuoco, A. Smialkowski, D. Harari, D. Harari, D.V Semikoz, G.T. Zatsepin, G.T. Zatsepin, J. Donnert, J.P. Rachen, J.P. Rachen, K Dolag, K. Dolag, K. Dolag, K. Mannheim, M Kachelrieß, M. Brüggen, Pierre Auger collaboration, The Pierre Auger collaboration, Y.Y. Kovalev   +19 more
core   +3 more sources

Performance evaluation of oscillation stability analysis method for direct-drive wind power grid connected system considering control strategy switching

International Journal of Electrical Power & Energy Systems
In view of the difficulty in evaluating the oscillation stability of direct-drive wind farm integrated power system during fault recovery, this paper proposed an oscillation stability analysis method based on dynamic energy.
Jing Ma, Ningsai Su, Yufeng Zhao, Xi Shi, Chenzhao Han, Yaqi Shen   +5 more
doaj   +1 more source

Spatially resolved nanostructural analysis of disordered phases in carbonated alkali-activated slag

Nature Communications
Alkali-activated slag (AAS) is a promising low-CO2 alternative cement consisting of several disordered phases of similar composition. Although their local atomic arrangements are known to influence macroscopic behavior, determination of structural ...
Eric R. McCaslin, Michael C. James, Jonathan Almer, Zhonghou Cai, Peter Kenesei, Jun-Sang Park, Claire E. White   +6 more
doaj   +1 more source

A New Quantitative Analysis Method for Overvoltage in Sending End Electric Power System With UHVDC

IEEE Access, 2020
With the development of renewable electric power generation and ultra-high voltage direct current (UHVDC) transmission, the transient overvoltage in the sending end electric power system with UHVDC occurs, but it is lack of quantitative transient voltage
Ancheng Xue, Lei Yue, Jiahuan Zhang, Jiehao Cui, Zhiqiang Li, Yecheng Li, Lei Gao, Weifang Lin, Xiaoyu Ren   +8 more
doaj   +1 more source

A study of the electromagnetic fields leakage in TM020 mode HOM-damped cavity

Nuclear Engineering and Technology
Radiofrequency cavities are crucial components in synchrotron light sources, providing beam energy replenishment and accelerating voltage. TM020 mode cavities offer superior performance compared to conventional TM010 cavities, exhibiting a higher quality
Xuerui Hao, Junyu Zhu, Xiao Li, Zhijun Liu, Chunlin Zhang, Wei Long, Shengyi Chen, Yang Liu, Shenghua Liu, Bin Wu   +9 more
doaj   +1 more source

Unidirectional spin density wave state in metallic (Sr1−xLa x )2IrO4

Nature Communications, 2018
Electron-doped Sr2IrO4 is an intriguing material for searching for an unconventional superconducting state. Here the authors demonstrate that a spin density wave state exists in the metallic phase of electron-doped Sr2IrO4 which provides a link between ...
Xiang Chen, Julian L. Schmehr, Zahirul Islam, Zach Porter, Eli Zoghlin, Kenneth Finkelstein, Jacob P. C. Ruff, Stephen D. Wilson   +7 more
doaj   +1 more source

A New Transient Frequency Acceptability Margin Based on the Frequency Trajectory

Energies, 2018
When the electric power system is disturbed, the transient frequency deviation may be large and harmful to its stable operation, especially in some small power systems.
Ancheng Xue, Jiehao Cui, Jiawei Wang, Joe H. Chow, Lei Yue, Tianshu Bi   +5 more
doaj   +1 more source