n the research on the mechanical properties of the blood vessel, it is necessary to measure three-dimensional deformation of the blood vessel. This paper presents a non-contact optical method for measuring these defor...n the research on the mechanical properties of the blood vessel, it is necessary to measure three-dimensional deformation of the blood vessel. This paper presents a non-contact optical method for measuring these deformation in vitro or in vivo, and the data-processing procedure for the three-dimensional coordinate reconstruction of the aorta surface. The accuracy of this method is tested with a known cylinder. This method has been used in the study of the rabbit aorta and the result shows that it is valuable in the research on the mechanical properties of the blood vessel.展开更多
We report an extraordinary sound absorption enhancement in low and intermediate frequencies achieved by a thin multi-slit hybrid structure formed by incorporating micrometer scale micro-slits into a sub-millimeter sca...We report an extraordinary sound absorption enhancement in low and intermediate frequencies achieved by a thin multi-slit hybrid structure formed by incorporating micrometer scale micro-slits into a sub-millimeter scale meso-slit matrix. Theoretical and numerical results reveal that this exotic phenomenon is attributed to the noticeable velocity and temperature gradients induced at the junctures of the micro- and meso-slits, which cause significant loss of sound energy as a result of viscous and thermal effects. It is demonstrated that the proposed thin multi-slit hybrid structure with micro-scale configuration is capable of controling low frequency noise with large wavelength, which is attractive for applications where the size and weight of a sound absorber are restricted.展开更多
文摘n the research on the mechanical properties of the blood vessel, it is necessary to measure three-dimensional deformation of the blood vessel. This paper presents a non-contact optical method for measuring these deformation in vitro or in vivo, and the data-processing procedure for the three-dimensional coordinate reconstruction of the aorta surface. The accuracy of this method is tested with a known cylinder. This method has been used in the study of the rabbit aorta and the result shows that it is valuable in the research on the mechanical properties of the blood vessel.
基金Supported by the National Basic Research Program of China under Grant No 2011CB610300the National Natural Science Foundation of China under Grant Nos 11102148 and 11321062the Fundamental Research Funds for Central Universities of China
文摘We report an extraordinary sound absorption enhancement in low and intermediate frequencies achieved by a thin multi-slit hybrid structure formed by incorporating micrometer scale micro-slits into a sub-millimeter scale meso-slit matrix. Theoretical and numerical results reveal that this exotic phenomenon is attributed to the noticeable velocity and temperature gradients induced at the junctures of the micro- and meso-slits, which cause significant loss of sound energy as a result of viscous and thermal effects. It is demonstrated that the proposed thin multi-slit hybrid structure with micro-scale configuration is capable of controling low frequency noise with large wavelength, which is attractive for applications where the size and weight of a sound absorber are restricted.
