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Differences between surface velocity estimates from dual-beam along-track interferometric (ATI) synthetic aperture radar (SAR) and drift rate measurements by surface current drifters are presented for a tidally-driven river mouth. Using hydrodynamic and scattering models, we analyze the contributions from various sources in order to explain the observed differences. We find that the differences are...
This work presents the analysis of wave and turbulence measurements collected at a tidal energy site. A new method is introduced to produce more consistent and rigorous estimations of the velocity fluctuations power spectral densities. An analytical function is further proposed to fit the observed spectra and could be input to the numerical models predicting power production and structural loading...
P-emitter and n-buffer layers have been optimized for 1700V planar gate DMOS IGBTs by applying laser annealing technique which can overcome the challenge of thin wafer processes to activate dopants implanted from the backside after wafer backside ground. The modules assembled using new chips combining optimized p-emitter/n-buffer design and backside laser annealing process showed attractive on-state...
Oceanic intrusions of dense, hypoxic water regularly occur at the entrance to Puget Sound, WA (USA), and may be significant to regional dissolved oxygen levels. Seabed observations at Admiralty Inlet from 2009 to 2013 show a strong correlation of low dissolved oxygen concentrations with high salinity, coincident with residual currents directed inward to Puget Sound. These intrusions of dense water...
We have presented the work done on optimization of the 6.5kV IGBT device for increasing the safe operating area both for RBSOA and SCSOA. The optimization of the bipolar gain of the IGBT has been studied. We have shown that reducing gate capacitance by 50% combined with increased bipolar gain improves the short circuit robustness. The short circuit current capability of the 6.5 kV IGBT chip is significantly...
Field measurements of the underwater acoustic signature of Columbia Power Technologies (Columbia Power) SeaRay wave energy converter (WEC) prototype are presented. The device was deployed in the vicinity of West Point (Puget Sound, Washington State) at a depth of approximately 20 meters. The 1/7th scale SeaRay prototype is a heave and surge, point absorber secured to the seabed with a three-point...
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