Power Devices for Efficient Energy Conversion

2018 ◽  
Author(s):  
Gourab Majumdar
Keyword(s):  
Energy Conversion ◽  
Power Devices ◽  
Efficient Energy

Power-dependent photophysical pathways of upconversion in BaTiO3:Er3+

2021 ◽  
Author(s):  
Hyeongyu Bae ◽  
Eunsang Lee ◽  
Kang Taek Lee
Keyword(s):  
Energy Conversion ◽  
Light Emitting ◽  
Efficient Energy

Lanthanide incorporated perovskite is one of the most promising systems for efficient energy conversion or light-emitting materials in terms of upconversion (UC). The photophysical mechanism of UC in the lanthanide-doped...

Efficient Energy Conversion in Photochromic Ruthenium DMSO Complexes

2006 ◽  
Vol 45 (15) ◽  
pp. 5953-5960 ◽  
Author(s):  
Aaron A. Rachford ◽  
Jeffrey L. Petersen ◽  
Jeffrey J. Rack
Keyword(s):  
Energy Conversion ◽  
Efficient Energy

Micro-scale tearing mode turbulence in the diffusion region during macro-scale evolution of turbulent reconnection

2021 ◽  
Author(s):  
Takuma Nakamura ◽  
Hiroshi Hasegawa ◽  
Tai Phan ◽  
Kevin Genestreti ◽  
Richard Denton ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Energy Conversion ◽  
Magnetic Reconnection ◽  
Diffusion Region ◽  
Electron Diffusion ◽  
Efficient Energy ◽  
Micro Scale ◽  
Island Evolution ◽  
Macro Scale ◽  
Scale Evolution

<p>Magnetic reconnection is a key fundamental process in collisionless plasmas that explosively converts magnetic energy to plasma kinetic and thermal energies through a change of magnetic field topology in an electron-scale central region called the electron diffusion region. Past simulations and observations demonstrated that this process causes efficient energy conversion through the formation of multiple macro-scale or micro-scale magnetic islands/flux ropes. However, how these different spatiotemporal scale phenomena are coupled is still poorly understood. In this study, to investigate the turbulent evolution of magnetic reconnection, we perform a new large-scale fully kinetic simulation of a thin current sheet considering a power-law spectrum of initial fluctuations in the magnetic field as frequently observed in the Earth’s magnetotail. The simulation demonstrates that during a macro-scale evolution of turbulent reconnection, the merging of macro-scale islands results in reduction of the rate of reconnection as well as the aspect ratio of the electron diffusion region. This allows the repeated, quick formation of new electron-scale islands within the electron diffusion region, leading to an efficient energy cascade between macro- and micro-scales. The simulation also demonstrates that a strong electron acceleration/heating occurs during the micro-scale island evolution within the EDR. These new findings indicate the importance of non-steady features of the EDR to comprehensively understand the energy conversion and cascade processes in collisionless reconnection.</p>

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