The Experts below are selected from a list of 15441 Experts worldwide ranked by ideXlab platform
Zhihong Wang - One of the best experts on this subject based on the ideXlab platform.
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The sound field analysis of piezoelectric micromachined ultrasound transducer array
2009 International Conference on Mechatronics and Automation, 2009Co-Authors: Yueping Xu, Limei Xu, Xuesheng Li, Jianmin Miao, Zhihong WangAbstract:The acoustic boundary element method is applied to solve the Helmholtz boundary integral equation for the sound field problem in the Exterior Region. Basing on the acoustic boundary element method, the SYSNOISE software is used to numerically calculate the far field sound pressure in the Exterior Region of piezoelectric micromachined ultrasound transducer array. On the other hand, according to given test conditions, the test platform is putted up, and the frequency response curve chart of the sound pressure level is plotted in the frequency domain. It's shown that the results obtained by the two methods make a good agreement with each other, and that the acoustic boundary element method with SYSNOISE software in this paper can be used to predict the performance of piezoelectric micromachined ultrasound transducer array at the stage of preliminary design.
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The Sound field Analysis ofPiezoelectric Micromachined Ultrasound Transducer Array
2009Co-Authors: Jianmin Miao, Zhihong WangAbstract:The acoustic boundary element method is applied to solve the Helmholtz boundary integral equation for the sound field problem in the Exterior Region. Basing on the acoustic boundary element method, the SYSNOISE software is used to numerically calculate the far field sound pressure in the Exterior Region of piezoelectric micromachined ultrasound transducer array. On the other hand, according to given test conditions, the test platform is putted up, and the frequency response curve chart of the sound pressure level is plotted in the frequency domain. It's shown that the results obtained by the two methods make a good agreement with each other, and that the acoustic boundary element method with SYSNOISE software in this paper can be used to predict the performance of piezoelectric micromachined ultrasound transducer array at the stage of preliminary design.
Sandip Das - One of the best experts on this subject based on the ideXlab platform.
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guarding Exterior Region of a simple polygon
International Symposium on Algorithms and Computation, 2008Co-Authors: Arindam Karmakar, Sasanka Roy, Sandip DasAbstract:In this paper, our objective is to locate a position of a guard on the convex hull of a simple polygon P, such that, the farthest point on the boundary of the polygon from the location of the guard, avoiding the interior Region of the polygon P, is minimum among all possible locations of the guard on the convex hull. In other words, we try to identify the possible position of guard on the boundary of convex hull such that the maximum distance required to reach a trouble point on the boundary of polygon P avoiding the interior Region of P is minimized. The time complexity of our algorithm is O(n) where n is the number of vertices of P.
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WALCOM - Guarding Exterior Region of a simple polygon
WALCOM: Algorithms and Computation, 1Co-Authors: Arindam Karmakar, Sasanka Roy, Sandip DasAbstract:In this paper, our objective is to locate a position of a guard on the convex hull of a simple polygon P, such that, the farthest point on the boundary of the polygon from the location of the guard, avoiding the interior Region of the polygon P, is minimum among all possible locations of the guard on the convex hull. In other words, we try to identify the possible position of guard on the boundary of convex hull such that the maximum distance required to reach a trouble point on the boundary of polygon P avoiding the interior Region of P is minimized. The time complexity of our algorithm is O(n) where n is the number of vertices of P.
Yueping Xu - One of the best experts on this subject based on the ideXlab platform.
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The sound field analysis of piezoelectric micromachined ultrasound transducer array
2009 International Conference on Mechatronics and Automation, 2009Co-Authors: Yueping Xu, Limei Xu, Xuesheng Li, Jianmin Miao, Zhihong WangAbstract:The acoustic boundary element method is applied to solve the Helmholtz boundary integral equation for the sound field problem in the Exterior Region. Basing on the acoustic boundary element method, the SYSNOISE software is used to numerically calculate the far field sound pressure in the Exterior Region of piezoelectric micromachined ultrasound transducer array. On the other hand, according to given test conditions, the test platform is putted up, and the frequency response curve chart of the sound pressure level is plotted in the frequency domain. It's shown that the results obtained by the two methods make a good agreement with each other, and that the acoustic boundary element method with SYSNOISE software in this paper can be used to predict the performance of piezoelectric micromachined ultrasound transducer array at the stage of preliminary design.
Jianmin Miao - One of the best experts on this subject based on the ideXlab platform.
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The sound field analysis of piezoelectric micromachined ultrasound transducer array
2009 International Conference on Mechatronics and Automation, 2009Co-Authors: Yueping Xu, Limei Xu, Xuesheng Li, Jianmin Miao, Zhihong WangAbstract:The acoustic boundary element method is applied to solve the Helmholtz boundary integral equation for the sound field problem in the Exterior Region. Basing on the acoustic boundary element method, the SYSNOISE software is used to numerically calculate the far field sound pressure in the Exterior Region of piezoelectric micromachined ultrasound transducer array. On the other hand, according to given test conditions, the test platform is putted up, and the frequency response curve chart of the sound pressure level is plotted in the frequency domain. It's shown that the results obtained by the two methods make a good agreement with each other, and that the acoustic boundary element method with SYSNOISE software in this paper can be used to predict the performance of piezoelectric micromachined ultrasound transducer array at the stage of preliminary design.
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The Sound field Analysis ofPiezoelectric Micromachined Ultrasound Transducer Array
2009Co-Authors: Jianmin Miao, Zhihong WangAbstract:The acoustic boundary element method is applied to solve the Helmholtz boundary integral equation for the sound field problem in the Exterior Region. Basing on the acoustic boundary element method, the SYSNOISE software is used to numerically calculate the far field sound pressure in the Exterior Region of piezoelectric micromachined ultrasound transducer array. On the other hand, according to given test conditions, the test platform is putted up, and the frequency response curve chart of the sound pressure level is plotted in the frequency domain. It's shown that the results obtained by the two methods make a good agreement with each other, and that the acoustic boundary element method with SYSNOISE software in this paper can be used to predict the performance of piezoelectric micromachined ultrasound transducer array at the stage of preliminary design.
Adrian C. Ottewill - One of the best experts on this subject based on the ideXlab platform.
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Hadamard Renormalization of the Stress Energy Tensor in a Spherically Symmetric Black Hole Space-Time with an Application to Lukewarm Black Holes
Physical Review D, 2012Co-Authors: Cormac Breen, Adrian C. OttewillAbstract:We consider a quantum field which is in a Hartle-Hawking state propagating in a spherically symmetric black hole space-time. We calculate the components of the stress tensor, renormalized using the Hadamard form of the Green's function, in the Exterior Region of this space-time. We then specialize these results to the case of the `lukewarm' Riessner-Nordstrom-de Sitter black hole.
