Results 21 to 30 of about 146,403 (298)

Performance Evaluation of Wide-Angle Ultrathin Microwave Metamaterial Absorber with Polarization Independence

open access: yesAdvanced Electromagnetics, 2018
A novel dual-band wide-angle ultra-thin absorber composed of dual closed-concentric ten-point stars with polarization independence is presented in this article. The ten-point stars formed resonators are engraved on low cost FR4 substrate. The EM absorber
K. P. Kaur, T. Upadhyaya
doaj   +1 more source

Dynamics of Heaving Buoy Wave Energy Converters with a Stiffness Reactive Controller

open access: yesEnergies, 2020
Heaving buoy wave energy converters (WEC) are floating oscillators, commonly modeled as single-degree-of-freedom vibrating systems. As the wave frequencies change according to the sea state, these devices must be controlled to maximize energy absorption.
Ahmed H. Sakr   +2 more
doaj   +1 more source

Exploring the Potential for Increased Production from the Wave Energy Converter Lifesaver by Reactive Control

open access: yesEnergies, 2013
Fred Olsen is currently testing their latest wave energy converter (WEC), Lifesaver, outside of Falmouth Bay in England, preparing it for commercial operation at the Wavehub test site.
Marta Molinas   +3 more
doaj   +1 more source

Modeling of a Point Absorber for Energy Conversion in Italian Seas

open access: yesEnergies, 2013
In the present paper, we investigate the feasibility of wave electricity production in Italian seas by the deployment of the Seabased wave energy converter (WEC).
Renata Archetti   +4 more
doaj   +1 more source

Discovery of a Metal-Line Absorber Associated with a Local Dwarf Starburst Galaxy [PDF]

open access: yes, 2006
We present optical and near-infrared images, H I 21 cm emission maps, optical spectroscopy, and Hubble Space Telescope/Space Telescope Imaging Spectrograph ultraviolet spectroscopy of the QSO/galaxy pair SBS 1122+594/IC 691.
Babul A.   +6 more
core   +3 more sources

Model Predictive Control of a Wave Energy Converter with Discrete Fluid Power Power Take-Off System

open access: yesEnergies, 2018
Wave power extraction algorithms for wave energy converters are normally designed without taking system losses into account leading to suboptimal power extraction.
Anders Hedegaard Hansen   +2 more
doaj   +1 more source

Maximum Energy Capturing Approach for Heaving Wave Energy Converters Using an Estimator-Based Finite Control Set Model Predictive Control

open access: yesIEEE Access, 2021
The control problem in wave energy continues to remain an open question. This is mainly attributed to the difficulties associated with developing effective, yet economically viable, wave energy-harnessing control strategies, such as resource irregularity,
Mohammed Jama   +3 more
doaj   +1 more source

A Statistical Analysis for Optimisation of a Hybrid BBDB-PA in Mantanani Island, Sabah

open access: yesJournal of Marine Science and Engineering, 2023
The hybrid form of wave energy converter (WEC) is a recent advancement in research concerning harvesting energy from the ocean. This study investigates the effect of size and position of the point absorber integrated with a backward bent duct buoy.
Muhamad Aiman Jalani   +6 more
doaj   +1 more source

Wave Energy Assessment along Sicilian Coastline, Based on DEIM Point Absorber

open access: yesEnergies, 2017
The use of renewable energy sources is one of the most relevant goals to be achieved in order to match the climate protection targets. As a case study, the paper shows the current electrical energy production by sources in the Sicilian context. Among the
Vincenzo Franzitta   +2 more
doaj   +1 more source

Energy-dependent evolution in IC10 X-1: hard evidence for an extended corona and implications [PDF]

open access: yes, 2014
We have analyzed a ~130 ks XMM-Newton observation of the dynamically confirmed black hole + Wolf-Rayet (BH+WR) X-ray binary (XB) IC10 X-1, covering ~1 orbital cycle. This system experiences periodic intensity dips every ~35 hr.
Barnard, R.   +5 more
core   +2 more sources

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