In this paper we develop linear, fixed-order (i.e., fulland reduced-order) pressure rise feedback dynamic compensators for axial flow compressors. Unlike the nonlinear static controllers proposed in the literature possessing gain at all frequencies, the proposed dynamic compensators explicitly account for compressor performance versus sensor accuracy, compressor performance versus processor thr...

Period-doubling routes to chaos in dc/dc converters operating in discontinuous mode have been reported in Reference 1 for the boost-type converter, and in Reference 2 for the buck-type converter. The chaotic behaviour associated with such systems is due to the presence of the feedback controller since these systems are open-loop stable.3 Thus, the choice of the feedback control function is very...

We report new observations toward the hyper-luminous dusty starbursting major merger ADFS-27 (z=5.655), using ATCA and ALMA. detect CO 2-1, 8-7, 9-8, 10-9 H2O(321-221) emission, a P-Cygni-shaped OH+(11-01) absorption/emission feature. also tentatively H2O(321-312) OH+(12-01) emission CH+(1-0) absorption. find total cold molecular mass of M_gas = (2.1+/-0.2) x 10^11 (alpha_CO/1.0) Msun. that exc...

We describe a feedback mechanism in the gas cascade amplification process used in magnetic immersion lens environmental scanning electron microcopy (ESEM). Feedback dominates gas gain under the conditions typically used for ultra-high-resolution ESEM and gives rise to novel dependencies of the imaging signal and noise on microscope operating parameters. It is ascribed tentatively to the generat...

This paper describes the search system we developed for the inaugural TREC 2011 Microblog Track. Our system makes use of best-practice ranking techniques, including term, phrase, and proximity-based text matching via the Markov random field model, pseudo-relevance feedback using Latent Concept Expansion, and a feature-based ranking model that uses a simple, but effective learningto-rank model. ...

In order to demonstrate attentiveness during a conversation it is generally necessary for the listener to provide back-channel feedback. To some extent, the times when back-channel feedback is welcome are determined by the speaker and conveyed to the listener with prosodic cues. In this study we sought to identify the cues used for this purpose in Northern Mexican Spanish. Based on quantitative...

Active feedback noise control for rejecting broadband disturbances must contend with the Bode integral constraint, which implies that suppression over some frequency range gives rise to amplification over another range at the performance microphone. This is called spectral spillover. The present paper deals with spatial spillover, which refers to the amplification of noise at locations where no...

We study the mechanical feedback coupling between the human vocal folds and vocal tract (VT) by simulating fundamental frequency glides over the lowest VT resonance. In the classical source– filter theory of speech production, the vocal folds produce a signal which is filtered by the resonator, vocal tract without any feedback. We have developed a computational model of the vocal folds and the ...

In this paper, we consider competitive neural networks with lateral inhibitory feedback. In the feline LGN, lateral inhibition is known to modulate the gain of NMDA-mediated excitation. We formulate a population model for this behaviour in which the excitatory gain of each neuron is modulated as a function of the ratio between current activity and an inhibitory feedback signal. This arrangement...