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Items from 1 to 8 out of 8 results

article

Fast transient control for power adjustment in a dual-active-bridge converter

S.-T. Lin, X. Li, C. Sun, Y. Tang

Electronics Letters > 2017 > 53 > 16 > 1130 - 1132

A transient control for a dual-active-bridge (DAB) dc/dc converter to realise power adjustment in a fast and smooth way is proposed. The converter is able to transfer power between two dc sources with two phase-shifts as control variables. To eliminate the possible high-current overshoot and non-zero dc-bias current, the adjustments of the two phase-shifts are distributed to the gating signals of...

article

On the Shiftability of Dual-Tree Complex Wavelet Transforms

K.N. Chaudhury, M. Unser

IEEE Transactions on Signal Processing > 2010 > 58 > 1 > 221 - 232

The dual-tree complex wavelet transform (DT-\BBCWT) is known to exhibit better shift-invariance than the conventional discrete wavelet transform. We propose an amplitude-phase representation of the DT-IBBC WT which, among other things, offers a direct explanation for the improvement in the shift-invariance. The representation is based on the shifting action of the group of fractional Hilbert transform...

article

The effects of top–down versus bottom–up control on benthic coral reef community structure

Jennifer E. Smith, Cynthia L. Hunter, Celia M. Smith

Oecologia > 2010 > 163 > 2 > 497-507

While climate change and associated increases in sea surface temperature and ocean acidification, are among the most important global stressors to coral reefs, overfishing and nutrient pollution are among the most significant local threats. Here we examined the independent and interactive effects of reduced grazing pressure and nutrient enrichment using settlement tiles on a coral-dominated reef via...

article

Local variation in herbivore feeding activity on an inshore reef of the Great Barrier Reef

C. Cvitanovic, D. R. Bellwood

Coral Reefs > 2009 > 28 > 1 > 127-133

Threats to coral reefs may be manifested through an increase in macroalgae. Across the globe, phase-shifts from coral to macroalgal dominance have been reported from the Caribbean, Indian and Pacific Oceans. While the Great Barrier Reef (GBR) is in relatively good condition, inshore reefs may exhibit over 50% macroalgal cover. However, our understanding of the processes preventing the macroalgal expansion...

chapter

Optimal design of SVC-based subsynchronous damping control using genetic and simulated annealing algorithm

Tingzhi Yang, Xiaorong Xie, Shiyu Liu, Donghui Zhang

2008 International Conference on Information and Automation > 1015 - 1020

2008 International Conference on Information and Automation (ICIA)

In this paper, an optimal approach based on genetic and simulated annealing algorithm (GASA) is prosposed to design more effective and robust subsynchronous damping control (SSDC) of Static Var Compensator (SVC) for multimodal SSR damping improvement. A practical multi-machine series compensated power system suffering multimodal SSR has been studied to demonstrate the effectiveness of the approach...

chapter

A novel control method for interleaved transition mode PFC

Bing Lu

2008 Twenty-Third Annual IEEE Applied Power Electronics Conference and Exposition > 697 - 701

2008 Twenty-Third Annual IEEE Applied Power Electronics Conference and Exposition (APEC '08)

Interleaving architecture extends high performance, low cost, transition mode PFC to higher power levels. Because the existing master slave interleaving control requires a slave channel operating in DCM mode, switching loss and EMI noise are increased. In this paper, a novel interleaving control method is proposed without using the master slave concept. The proposed method is able to realize 180 degrees...

chapter

KTN ferroelectric thin-films: Application to the realization of tunable microwave devices

Vincent Laur, Arnaud Moussavou, Anthony Rousseau, Gerard Tanne, more

2006 European Microwave Conference > 835 - 838

Proceedings of the 36th European Microwave Conference

Interdigital capacitors were fabricated on KTa_0.5Nb_0.5O₃/sapphire substrate. Since their measurements demonstrated the high tuning factor of KTNs, we designed and fabricated three distributed phase shifters. To our knowledge, they are the first phase-shifters realized on KTN thin films at microwave frequencies. These circuits present interesting phase-shifts, but their figures of merit are weakened...

article

Cross-Generalization of an EtOH Hangover Cue to Endogenously and Exogenously Induced Stimuli - substitution of ethyl alcohol for morphine

Pharmacology, Biochemistry and Behavior > 1997 > 57 > 1-2 > 199-206

Twenty male Sprague-Dawley rats were trained in a two-choice food-reinforced drug discrimination task (10 min sessions) using the state-dependent interoceptive stimulus attributes of ethanol's (EtOH) delayed or rebound effects (EDE) versus normal basal homeostasis. Cross-generalization tests were conducted with 0.18 mg/kg naloxone injected after three days of three injections per day of either...

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