Výsledky vyhledávání - "N. H. C. Hwang"

The Closing Behavior of Medtronic Hall Mechanical Heart Valves

Autor: N. H. C. Hwang, Zhongjun J. Wu, D. R. Scott, M. C. S. Shu

Publikováno v: ASAIO Journal. 40:M702-M706

The rapid deceleration of mechanical heart valve leaflets or discs at closure, and their rebound after impact between the leaflets or discs and housing may produce conditions that favor cavitation inception. Precision measurements of the disc closing

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ff57f8906e4e34826244c4c198afd9e8
https://doi.org/10.1097/00002480-199407000-00089

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Closing Behavior of a New Bileaflet Mechanical Heart Valve

Autor: T. L. Armitage, Danny Bluestein, Z. J. Wu, S. Menon, N. H. C. Hwang, A. Haubold

Publikováno v: ASAIO Journal. 39:M398-M402

Recently, the in vivo cavitation potential has become a primary concern among manufacturers of new mechanical heart valves (MHV). An experimental/computational program was designed to investigate each of the flow parameters involved. It was establish

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a5c55125c213b930dbc64e4dd4fc9eb7
https://doi.org/10.1097/00002480-199307000-00049

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A new LDA system utilising the optic-electro-hybrid feedback technique

Autor: Xiaoming Guo, Changwen Liu, N H C Hwang, Shikang Wang

Publikováno v: Measurement Science and Technology. 1:265-271

The optic-electro-hybrid feedback laser Doppler anemometer (OEHF-LDA) is designed by using a controlled acousto-optic frequency shift and a hybrid feedback closed loop containing both optic and electronic signals. Instead of a wide frequency bandwidt

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::252695def2ab5e87c86409bc78e8ffe2
https://doi.org/10.1088/0957-0233/1/3/011

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In Vitro Performance of Venous Valve Prostheses An Experimental Model Study

Autor: N. H. C. Hwang, Y. C. Qiu, G. A. Delaria, R. C. Quijano, S. K. Wang, Roger Tu, T. J. Phifer

Publikováno v: ASAIO Journal. 38:M213-M215

The performance of fresh and glutaraldehyde fixed bovine jugular vein valves (10 mm diameter) was investigated in an experimental flow loop that provides adjustable flow rates and a downstream oscillatory pressure. Three different venous valve (VV) c

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f0faecea5b9ccb371ac73dd4756b8316
https://doi.org/10.1097/00002480-199207000-00022

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Transient pressure signals in mechanical heart valve cavitation

Autor: J. H. Slonin, Zhongjun J. Wu, N. H. C. Hwang

Publikováno v: ASAIO journal (American Society for Artificial Internal Organs : 1992). 42(5)

The purpose of this investigation was to establish a correlation between mechanical heart valve (MHV) cavitation and transient pressure (TP) signals at MHV closure. This correlation may suggest a possible method to detect in vivo MHV cavitation. In a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f8679d0f4a62613d5e5291534d44ff80
https://pubmed.ncbi.nlm.nih.gov/8944941

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Estimation of the rotational undamped natural frequency of bileaflet cardiac valve prostheses

Autor: N. H. C. Hwang, T. H. Reif, T. J. Schulte

Publikováno v: Journal of biomechanical engineering. 112(3)

The angular momentum balance is solved numerically for a size 29 mm CarboMedics prosthetic heart valve. The lift force is estimated from potential flow theory, while the drag force is estimated from the lift force and a blunt body empiricism. Buoyanc

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e17ebc60739619ba1c1e94f9a15495d1
https://pubmed.ncbi.nlm.nih.gov/2214716

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