Investigation of the light energy extraction efficiency using surface modes in electrically pumped semiconductor microcavity

2010 ◽  
Author(s):  
E. H. Khoo ◽  
I. Ahmed ◽  
E. P. Li
Keyword(s):  
Extraction Efficiency ◽  
Light Energy ◽  
Energy Extraction ◽  
Surface Modes ◽  
Electrically Pumped ◽  
Semiconductor Microcavity

Light Energy Extraction From the Minor Surface Arc of an Electrically Pumped Elliptical Microcavity Laser

2010 ◽  
Vol 46 (1) ◽  
pp. 128-136 ◽  
Author(s):  
Eng Huat Khoo ◽  
Er Ping Li ◽  
Iftikhar Ahmed ◽  
Yingyan Huang ◽  
Seng Tiong Ho
Keyword(s):  
Light Energy ◽  
Energy Extraction ◽  
Microcavity Laser ◽  
Electrically Pumped

ASE effect and energy extraction efficiency in high-power DF laser systems with MOPA configuration

2011 ◽  
Vol 23 (4) ◽  
pp. 885-889
Author(s):  
陈星 Chen Xing ◽  
刘文广 Liu Wenguang ◽  
姜宗福 Jiang Zongfu ◽  
靳冬欢 Jin Donghuan
Keyword(s):  
High Power ◽  
Extraction Efficiency ◽  
Energy Extraction ◽  
Laser Systems

scholarly journals A Two-stage Energy Extraction Circuit for Energy Harvesting in Non-Sinusoidal Excited Environments

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 700 ◽  
Author(s):  
Philipp Dorsch ◽  
Toni Bartsch ◽  
Florian Hubert ◽  
Heinrich Milosiu ◽  
Stefan J. Rupitsch
Keyword(s):  
Energy Harvester ◽  
Extraction Efficiency ◽  
Tracking System ◽  
Electrical Energy ◽  
Use Case ◽  
Energy Extraction ◽  
Two Stage ◽  
Asset Tracking ◽  
Piezoelectric Energy ◽  
Radio Signals

We present a two-stage energy extraction circuit for a piezoelectric energy harvester, powering an asset-tracking system. Exploiting non-sinusoidal accelerations generated by many logistic transport devices, e.g., pushcarts, forklifts, assembly belts or cars, we are able to harvest sufficient electrical energy to transmit radio signals, which will allow to track the object when it is moving. By using the proposed energy extraction circuit, the energy extraction efficiency could be improved by at least 30% compared to a single-stage solution for sinusoidal excitations. In the practical use-case, the two-stage energy extraction network performs more than four times better compared to the single staged on.

scholarly journals The revived Penrose process can power the central engine in active galactic nuclei

1986 ◽  
Vol 119 ◽  
pp. 395-398
Author(s):  
Sanjay M. Wagh ◽  
N. Dadhich
Keyword(s):  
Magnetic Field ◽  
Active Galactic Nuclei ◽  
Extraction Efficiency ◽  
Galactic Nuclei ◽  
High Energy ◽  
Energy Extraction ◽  
Central Engine ◽  
Penrose Process ◽  
The Magnetic Field ◽  
Very High

Using the fact that the efficiency of the revived (Wagh et al 1985) Penrose process of energy extraction from black holes immersed in electromagnetic fields can be very high (Parthasarathy et al, 1986) we show that this process can comfortably power the ‘central engine’ in Active Galactic Nuclei. The microphysical Penrose process energized particles will be ultrarelativistic in the asymptotic frame. Hence the kinematical analysis of escaping photons by Piran and Shaham (1977) will be a good approximation to the kinematics of these particles. From this analysis one expects the energized particles to emerge within an angle∼ 40° above and below the equatorial plane. These energetic particles, which are collimated in the funnel of an accretion disk and further on by the magnetic field, then, form supersonic, relativistic, bilateral jets. The relativistic Y factor for such jets can be expected to be ∼ 2 since these ultrarelativistic particles will effectively mimick radiation in ‘dragging’ the matter already injected inside the funnel. Various implications of high energy extraction efficiency are illustrated.

Study on Performance Enhancement of a Flapping Foil Energy Harvester Using Circulation Control

2021 ◽  
Vol 143 (7) ◽  
Author(s):  
Fangrui Shi ◽  
Xiaojing Sun
Keyword(s):  
Extraction Efficiency ◽  
Performance Enhancement ◽  
Net Energy ◽  
Circulation Control ◽  
Energy Extraction ◽  
Injection Port ◽  
Flapping Foil ◽  
Momentum Coefficient ◽  
Reduced Frequency ◽  
Wide Range

Abstract Oscillating motion, an effective way to harvest energy, has gradually become a hotspot in bionic motion research in recent years. Means of improving the energy-extraction efficiency of a flapping foil harvester have long been a focus of researchers. This paper proposes a new flapping foil harvester with circulation control and explores the effects of different parameters on its energy-extraction capacity to improve efficiency and achieve lowest cost. Setting the injection ports on the upper and lower surfaces near the trailing edge of the foil and implementing injection control during motion, the effects of the location of the injection port, pitching amplitude, momentum coefficient, reduced frequency, and jet mode on the circulation control flapping foil are systematically investigated under the condition of a Reynolds number of 13,800. The results show that circulation control can enhance the energy-extraction efficiency of a flapping foil across a wide range of parameters, in which the location of the injection port and momentum coefficient have the most obvious influence on efficiency, followed by pitching amplitude and reduced frequency. In addition, the jet mode is a crucial factor affecting net efficiency. Relative to the constant mode, the triangular mode of circulation control has the lowest energy consumption, and the net energy-extraction efficiency reaches up to 38.77% under a reduced frequency of 0.12, which is 22.24% higher than that of the plain flapping foil.

Investigation of array layout of tidal stream turbines on energy extraction efficiency

2020 ◽  
Vol 196 ◽  
pp. 106775
Author(s):  
Can Zhang ◽  
Jisheng Zhang ◽  
Linlong Tong ◽  
Yakun Guo ◽  
Peng Zhang
Keyword(s):  
Extraction Efficiency ◽  
Energy Extraction ◽  
Tidal Stream

Demonstration of high energy extraction efficiency in a laser‐diode pumped high gain Nd:YAG regenerative amplifier

1994 ◽  
Vol 64 (10) ◽  
pp. 1186-1188 ◽  
Author(s):  
Kenta Naito ◽  
Masato Ohmi ◽  
Koji Ishikawa ◽  
Masanori Akatsuka ◽  
Masanobu Yamanaka ◽  
...  
Keyword(s):  
Laser Diode ◽  
Extraction Efficiency ◽  
High Gain ◽  
High Energy ◽  
Energy Extraction ◽  
Regenerative Amplifier ◽  
Diode Pumped
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