2,305 research outputs found
OPTIMUM QUANTUM SEQUENCE CONTROL OF QUANTUM SERIES RESONANT CONVERTER FOR MINIMUM OUTPUT VOLTAGE RIPPLE
No full textA new control scheme named optimum quantum sequence control (OQSC) which always minimizes the output voltage ripple of the quantum series resonant converter (QSRC) for all possible sequences is proposed. This control scheme is so general that it is irrelevant to all circuit conditions such as magnitudes of circuit elements as well as input/output voltage so far as it is operating in the continuous conduction mode (CCM). Further more the dynamic range of QSRC is much extended by the OQSC. This feature is verified by simulations and experiments with good agreements
SLIDING MODE CONTROL OF A ZERO-CURRENT SWITCHING RESONANT CONVERTER
No full textA closed-loop output voltage control method for QSRC using a sliding mode control is presented. Because the closed-loop system can be reduced from 3rd order to 2nd order, the system design becomes very much simplified. It is shown that the dynamic ranges of the output voltage and load resistance are very large, and that the dynamic behaviour of the sliding mode control is not affected by input voltage, showing the robustness of the sliding mode control technique. These features are verified by computer simulations and experiments with good agreement
Development of a Laparoscopic Surgical System and Coordinates Relationship Between a Laparoscopic View and a Slave Manipulator
No full text
Aeroelastic characteristics of cylindrical hybrid composite panels with viscoelastic damping treatments
No full textSupersonic flutter analysis of cylindrical composite panels with structural damping treatments has been performed using the finite element method based on the zig-zag layerwise shell theory. The natural frequencies and loss factors of cylindrical viscoelastic composites are computed considering the effects of transverse shear deformation. And Kumhaar's modified piston theory is applied for the calculation of aerodynamic forces. The flutter of cylindrical composite panels is analyzed considering structural damping effect. With respect to aeroelastic stabilities, various damping characteristics of unconstrained layer, constrained layer, and symmetrically co-cured sandwich laminates are compared with those of an original base panel. (c) 2006 Elsevier Ltd. All rights reserved
Wh-Islands: A View from Correspondence Theory
No full textThis paper discusses a family of restrictions on syntactic extraction, so-called wh-islands. The analysis will be based on the OT syntax model developed in Vogel (2004a,b) which focuses on the correspondence between semantic, syntactic and phonological representations, in the spirit of work by Jackendoff (1997), Williams (2003) and Culicover & Jackendoff (2005). I will argue that the wh-island restriction results from the impossibility to establish a perfect semantics-syntax mapping in the relevant structures. The resulting constraint violations add up to yield the wh-island effect. Exceptions to the wh-island restrictions in English are argued to be prosodically licensed.
Section 2 introduces the model I am using, and presents examples of some accounts of ineffability which I developed elsewhere. That section also introduces the basics of my treatment of wh-movement. Section 3 develops the account of wh-islands. Section 4 discusses the exceptions to the wh-island restriction that we see in English, and extends my account to handle these cases. The OT implementation of this account is presented in Section 5.The definitive version of this paper is published in Modeling Ungrammaticality in Optimality Theory. It is available at https://www.equinoxpub.com/equinox/books/showbook.asp?bkid=212Vogel, R. (2009). Wh-Islands: A View from Correspondence Theory. In C. Rice (Ed.), Ungrammaticality in Optimality Theory. Oakville, CT:Equinox Pub. Ltd, 2009ISBN-13 9781845532154 (published book
Author's reply: Comments on delay-dependent robust H-infinity control for uncertain systems with a state-delay
No full textIn the above-mentioned comment, the authors point out a technical problem with the paper [Lee, Y. S., Moon, Y. S., Kwon, W. H., & Park, P. G. (2004). Delay-dependent robust H-infinity control for uncertain systems with a state-delay. Automatica, 40(1), 65-72]. We show this technical problem can be solved by changing the proof of Theorem 3.1. (C) 2007 Elsevier Ltd. All rights reserved.X115sciescopu
Influence of Lithiation on Nanomechanical Properties of Silicon Nanowires Probed with Atomic Force Microscopy
No full textThe nanomechanical properties of fully lithiated and unlithiated silicon nanowire deposited on silicon substrate have been studied with atomic force microscopy. Silicon nanowires were synthesized using the vapor-liquid-solid process on stainless steel substrates using Au catalyst. Fully lithiated silicon nanowires were obtained by using the electrochemical method, followed by drop-casting on the silicon substrate. The roughness, derived from a line profile of the surface measured in contact mode atomic force microscopy, has a smaller value for lithiated silicon nanowire and a higher value for unlithiated silicon nanowire. Force spectroscopy was utilitzed to study the influence of lithiation on the tip-surface adhesion force. Lithiated silicon nanowire revealed a smaller value than that of the Si nanowire substrate by a factor of two, while the adhesion force of the silicon nanowire is similar to that of the silicon substrate. The Young's modulus obtained from the force-distance curve, also shows that the unlithiated silicon nanowire has a relatively higher value than lithiated silicon nanowire due to the elastically soft amorphous structures. The frictional forces acting on the tip sliding on the surface of lithiated and unlithiated silicon nanowire were obtained within the range of 0.5-4.0 Hz and 0.01-200 nN for velocity and load dependency, respectively. We explain the trend of adhesion and modulus in light of the materials properties of silicon and lithiated silicon. The results suggest a useful method for chemical identification of the lithiated region during the charging and discharging process
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