VIV model test results are presented for a bundle of three parallel pipes all lying in the same plane, similar to a riser with large kill and choke lines. The rigid model was attached to a spring-mounted frame in the MIT towing tank. The horizontal model was towed in the tank and allowed to respond in free vibration to vortex-induced vibration in the cross-flow direction. The angle of attack of...

of thesis entitled: Verbal Information Verification for High-performance Speaker Authentication Submitted by QIN Chao for the degree of Master of Philosophy in Electronic Engineering at The Chinese University of Hong Kong in June 2005. Automatic speaker authentication is to authenticate the identity of a claimed speaker by verifying the identity-related information embedded in his/her spoken ut...

The long-span double-deck truss girder bridge has become a recommend structural form because of its good performance on traffic capacity. However, the vortex-induced vibration (VIV) characteristics for girders are more complicated and there is lack related research. In this research, wind tunnel tests were utilized to investigate VIV large-span bridge. Meanwhile, suppression effect aerodynamic ...

Heterogeneity in morphology, physiology and cellular chemistry of plant tissues can compromise successful cryoprotection and cryopreservation. Cryoprotection is a function of exposure time × temperature × permeability for the chosen protectant and diffusion pathway length, as determined by specimen geometry, to provide sufficient dehydration whilst avoiding excessive chemical toxicity. We have ...

OBJECTIVES The aim of this study was to examine 1-year outcomes of transseptal balloon-expandable transcatheter heart valve implantation in failed mitral bioprosthesis, ring annuloplasty, and mitral annular calcification (MAC). BACKGROUND Immediate outcomes following transseptal mitral valve implantation in failed bioprostheses are favorable, but data on subsequent outcomes are lacking. MET...

The role of the added mass coefficient in vortex induced vibration (VIV) bluff body is complex and elusive. It certain that decoding relationship between pattern will benefit prediction prevention VIV. We present a study on VIV long flexible cylinder forced rigid cylinder, combination experimental optical measurements high-fidelity numerical simulation. focus uniform flow over at fixed Reynolds...

This study is concerned with vortex-induced vibration (VIV) of deepwater marine risers. Riser response measurements from model tests on a densely instrumented long, flexible riser in uniform and sheared currents offer an almost ideal set-up for our work. Our objectives are two-fold: (i) we use the measured data to describe complexities inherent in riser motions accompanying VIV; and (ii) we dis...

A systematic methodology is presented to obtain the vortex induced vibrational modes of a riser, based on data from CFD coupled to a long beam under tension and placed in sheared cross-flow; two profiles were tested: (a) linear, and (b) exponential. The modes we estimate are in fact nonlinear equilibria between the flow-induced excitation forces and the structural dynamics and are characterized...

The stereochemistry of consabatine, which was isolated from the roots of Convolvulus sabatius Viv. as a novel natural compound, has now been determined by the synthesis of its Mosher esters. Consabatine was found to be 1'R-configurated.