The Experts below are selected from a list of 56088 Experts worldwide ranked by ideXlab platform
P T Leung - One of the best experts on this subject based on the ideXlab platform.
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high resolution Angular Measurement using surface plasmon resonance heterodyne interferometry at optimal incident wavelengths
Proceedings of SPIE the International Society for Optical Engineering, 2005Co-Authors: Haipang Chiang, Jinglun Lin, Railing Chang, Zhiwei Chen, P T LeungAbstract:We have recently demonstrated that ultra high resolution of Angular Measurement down to 10 -6 degree can be achieved via surface-plasmon-resonance heterodyne interferometry, in which the phase difference between p- and s- polarized reflected waves is monitored as a function of the incident angle. Here we give a brief summary of this technique and the rationale based on which such a Measurement is possible. As a further study, we have also investigated, via simulation, how the change in environmental temperature will affect the resolution limit of this very versatile technique.
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high resolution Angular Measurement using surface plasmon resonance via phase interrogation at optimal incident wavelengths
Optics Letters, 2005Co-Authors: Haipang Chiang, Jinglun Lin, Railing Chang, P T LeungAbstract:It is demonstrated that ultrahigh-resolution Angular Measurement can be achieved via surface-plasmon-resonance excitation in which the phase difference between p- and s-polarized reflected waves is monitored as a function of the incidence angle. Resolutions down to 1.9×10?6?deg are obtained by performing the Measurements at optimal incident wavelengths. This represents an order of magnitude improvement compared with previously reported values.
Haipang Chiang - One of the best experts on this subject based on the ideXlab platform.
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high resolution Angular Measurement using surface plasmon resonance heterodyne interferometry at optimal incident wavelengths
Proceedings of SPIE the International Society for Optical Engineering, 2005Co-Authors: Haipang Chiang, Jinglun Lin, Railing Chang, Zhiwei Chen, P T LeungAbstract:We have recently demonstrated that ultra high resolution of Angular Measurement down to 10 -6 degree can be achieved via surface-plasmon-resonance heterodyne interferometry, in which the phase difference between p- and s- polarized reflected waves is monitored as a function of the incident angle. Here we give a brief summary of this technique and the rationale based on which such a Measurement is possible. As a further study, we have also investigated, via simulation, how the change in environmental temperature will affect the resolution limit of this very versatile technique.
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high resolution Angular Measurement using surface plasmon resonance via phase interrogation at optimal incident wavelengths
Optics Letters, 2005Co-Authors: Haipang Chiang, Jinglun Lin, Railing Chang, P T LeungAbstract:It is demonstrated that ultrahigh-resolution Angular Measurement can be achieved via surface-plasmon-resonance excitation in which the phase difference between p- and s-polarized reflected waves is monitored as a function of the incidence angle. Resolutions down to 1.9×10?6?deg are obtained by performing the Measurements at optimal incident wavelengths. This represents an order of magnitude improvement compared with previously reported values.
Thanos Athanasiou - One of the best experts on this subject based on the ideXlab platform.
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geometry and flow in ascending aortic aneurysms are influenced by left ventricular outflow tract orientation detecting increased wall shear stress on the outer curve of proximal aortic aneurysms
The Journal of Thoracic and Cardiovascular Surgery, 2021Co-Authors: Yousuf M Salmasi, Selene Pirola, Suchaya Mahuttanatan, Serena M Fisichella, Sampad Sengupta, Omar A Jarral, Declan P Oregan, Thanos AthanasiouAbstract:Abstract Background The geometrical characterization of ascending thoracic aortic aneurysms in clinical practice is limited to diameter Measurements. Despite growing interest in hemodynamic assessment, its relationship with ascending thoracic aortic aneurysm pathogenesis is poorly understood. This study examines the relationship between geometry of the ventriculo-aortic junction and blood flow patterns in ascending thoracic aortic aneurysm disease. Methods Thirty-three patients with ascending thoracic aortic aneurysms (exclusions: bicuspid aortic valves, connective tissue disease) underwent 4-dimensional flow magnetic resonance imaging. After image segmentation, geometrical parameters were measured, including aortic curvature, tortuosity, length, and diameter. A unique Angular Measurement made by the trajectory of the left ventricular outflow tract axis and the proximal aorta was also conducted. Velocity profiles were quantitatively and qualitatively analyzed. In addition, 11 patients (33%) underwent wall shear stress mapping of the ascending thoracic aortic aneurysm region using computational fluid dynamics simulation. Results Greater left ventricular outflow tract aortic angles were associated with larger aortic diameters at the levels of the sinus (coefficient = 0.387, P = .014) and ascending aorta (coefficient = 0.284, P = .031). Patients with left ventricular outflow tract aortic angles greater than 60° had marked asymmetric flow acceleration on the outer curvature in the proximal aorta, ascertained from 4-dimensional flow analysis. For patients undergoing computational fluid dynamics assessment, regression analysis found that higher left ventricular outflow tract aortic angles were associated with significantly higher wall shear stress values in the outer curve of the aorta (coefficient 0.07, 95% confidence interval 0.04-0.11, P = .002): Angles greater than 50° yielded time-averaged wall shear stress values greater than 2.5 Pa, exhibiting a linear relationship. Conclusions Our findings strengthen the hypothesis of flow-mediated ascending thoracic aortic aneurysm disease progression and that left ventricular outflow tract aortic angle may be a predictor of disease severity.
Jinglun Lin - One of the best experts on this subject based on the ideXlab platform.
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high resolution Angular Measurement using surface plasmon resonance heterodyne interferometry at optimal incident wavelengths
Proceedings of SPIE the International Society for Optical Engineering, 2005Co-Authors: Haipang Chiang, Jinglun Lin, Railing Chang, Zhiwei Chen, P T LeungAbstract:We have recently demonstrated that ultra high resolution of Angular Measurement down to 10 -6 degree can be achieved via surface-plasmon-resonance heterodyne interferometry, in which the phase difference between p- and s- polarized reflected waves is monitored as a function of the incident angle. Here we give a brief summary of this technique and the rationale based on which such a Measurement is possible. As a further study, we have also investigated, via simulation, how the change in environmental temperature will affect the resolution limit of this very versatile technique.
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high resolution Angular Measurement using surface plasmon resonance via phase interrogation at optimal incident wavelengths
Optics Letters, 2005Co-Authors: Haipang Chiang, Jinglun Lin, Railing Chang, P T LeungAbstract:It is demonstrated that ultrahigh-resolution Angular Measurement can be achieved via surface-plasmon-resonance excitation in which the phase difference between p- and s-polarized reflected waves is monitored as a function of the incidence angle. Resolutions down to 1.9×10?6?deg are obtained by performing the Measurements at optimal incident wavelengths. This represents an order of magnitude improvement compared with previously reported values.
Railing Chang - One of the best experts on this subject based on the ideXlab platform.
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high resolution Angular Measurement using surface plasmon resonance heterodyne interferometry at optimal incident wavelengths
Proceedings of SPIE the International Society for Optical Engineering, 2005Co-Authors: Haipang Chiang, Jinglun Lin, Railing Chang, Zhiwei Chen, P T LeungAbstract:We have recently demonstrated that ultra high resolution of Angular Measurement down to 10 -6 degree can be achieved via surface-plasmon-resonance heterodyne interferometry, in which the phase difference between p- and s- polarized reflected waves is monitored as a function of the incident angle. Here we give a brief summary of this technique and the rationale based on which such a Measurement is possible. As a further study, we have also investigated, via simulation, how the change in environmental temperature will affect the resolution limit of this very versatile technique.
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high resolution Angular Measurement using surface plasmon resonance via phase interrogation at optimal incident wavelengths
Optics Letters, 2005Co-Authors: Haipang Chiang, Jinglun Lin, Railing Chang, P T LeungAbstract:It is demonstrated that ultrahigh-resolution Angular Measurement can be achieved via surface-plasmon-resonance excitation in which the phase difference between p- and s-polarized reflected waves is monitored as a function of the incidence angle. Resolutions down to 1.9×10?6?deg are obtained by performing the Measurements at optimal incident wavelengths. This represents an order of magnitude improvement compared with previously reported values.