3,360 research outputs found
Experimental study of noise reduction and improved cooling fan performance in a PDP TV
No full textThe present experimental study addresses fan system noise reduction and improvement in cooling performance in a plasma display panel (PDP) television (TV). The broadband noise in a PDP TV is closely related to system losses. The system losses, mainly due to rear case of the TV near the fan, are reduced by increasing the number of vent holes on the case, preventing secondary leakage flow between the fan and the case and modifying the rear case shape. The discrete noise is mainly related with the inflow conditions therefore, the removal of structures that distort inflow results in a discrete noise reduction. Additionally, the fan rotating speed is reduced because of the increased flow rate and reduced flow fluctuation, which is obtained from the reduction of system loss (resistance). 7.3dB(A) noise reduction and a 10 % increase in flow rate are achieved. The main concepts behind realizing noise reduction are prevention of recirculation flow around the fan and reduction of system loss. (C) Institute of Noise Control Engineering.The author wish to acknowledge the financial wupport of LG Electronics, Inc., and useful discussions with Dr, Suk Kwan Kim at LG-PRC
The role of prosodic and visual information in disambiguating wh-indeterminates: The case of Korean three-year-olds
No full textIn Korean language, questions containing ambiguous wh-words may be interpreted as either wh-questions or yes-no questions. This study investigated 43 Korean three-year-olds' ability to disambiguate eight indeterminate questions using prosodic and visual cues. The intonation of each question provided a cue as to whether it should be interpreted as a wh-question or a yes-no question. The questions were presented alongside picture stimuli, which acted as either a matched (presentation of corresponding auditory-visual stimuli) or a mismatched contextual cue (presentation conflicting auditory-visual stimuli). Like adults, the children preferred to comprehend questions involving ambiguous wh-words as wh-questions, rather than yes-no questions. In addition, children were as effective as adults in disambiguating indeterminate questions using prosodic cues regardless of the visual cue. However, when confronted with conflicting auditory-visual stimuli (mismatched), the quality of children's responses was less accurate than adults' responses.
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
Searching electrocatalysts for methanol oxidation and oxygen reduction in DMFC by combinatorial chemistry
No full textCHARACTERIZATION OF PSEUDOMONAS-FLUORESCENS CARBOXYLESTERASE - CLONING AND EXPRESSION OF THE ESTERASE GENE IN ESCHERICHIA-COLI
No full textThe Pseudomonas fluorescens gene (estB) that encodes a novel esterase (esterase II) was cloned into Escherichia coli JM83. DNA sequencing found a single open reading frame of 654 nucleotides. The open reading frame was confirmed by N-terminal amino acid sequence analysis of the esterase protein. A potential Shine-Dalgarno sequence is followed by the coding sequence of the estB gene. The amino acid sequence deduced from the nucleotide sequence contains the consensus active site sequence, G-X-S-X-G, of serine esterases. The enzyme expressed in an E. coli clone was purified by ion-exchange chromatography and gel filtration. Homogeneity of the purified enzyme was confirmed using SDS-polyacrylamide gel electrophoresis. The native enzyme exists as a dimer consisting of two identical subunits, each with a molecular weight of 23,000. The results of the experiments for identifying substrate specificity and the inhibitor studies suggest that this enzyme is a carboxylesterase (EC 3.1.1.1) and a serine residue is present at the active site of the esterase, as in the esterases of animal tissues
Double EIM and scalar BPM analyses of birefringence and wavelength shift for TE and TM polarized fields in bent planar lightwave circuits
No full textWe have applied the effective index method to reduce the two-dimensional refractive index profile into the one-dimensional refractive index structure and modified the wave equations to obtain the paraxial wave equations. Then, TE and TM polarized fields in the curved single-mode planar waveguides are analyzed by using the scalar beam-propagation method employing the finite-difference method with a slab structure. The birefringence for TE and TM polarized fields in bent waveguides is calculated from the phase difference of the optical fields. The wavelength shift due to the birefringence of TE and TM polarized fields in bent waveguides is also calculated
Enhanced Light Emission from Europium Complex Owing to the Localized Surface Plasmon of Silver Islands
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