In Fig. 2 of our paper,1 the correct units of the electric field should be mV/cm instead of V/cm and the units of the current density J should be kA/cm2 instead
In Fig. 2 of our paper,1 the correct units of the electric field should be mV/cm instead of V/cm and the units of the current density J should be kA/cm2 instead
We report one typo error of authors affiliation. Ya-Ju Lee is currently in the Institute of Electro-Optical Science and Technology, National Taiwan Normal Unive
We report one typo error of authors affiliation. Ya-Ju Lee is currently in the Institute of Electro-Optical Science and Technology, National Taiwan Normal Unive
On p. 2, first column, last paragraph, the sentence before the last contains a typographical error: “decrease” should be changed to “increase,” i.e., the senten
On p. 2, first column, last paragraph, the sentence before the last contains a typographical error: “decrease” should be changed to “increase,” i.e., the senten
The Fast Multipole Method (FMM) is a well‐established and effective method for accelerating numerical solutions of the boundary integral equations (BIE). The BIE method, accelerated by the FMM, can solve large‐scale...
The Fast Multipole Method (FMM) is a well‐established and effective method for accelerating numerical solutions of the boundary integral equations (BIE). The BIE method, accelerated by the FMM, can solve large‐scale electromagnetic wave propagation and diffusion problems with up to a million unknowns on a personal computer. The conventional BIE method requires O(N2) operations to compute the system of equations and another O(N2) operations to solve the system using iterative solvers, with N being the number of unknowns; in contrast, the BIE method accelerated by the two‐level FMM can potentially reduce the operations and memory requirement to O(N3/2). This paper introduces the procedure of the FMM accelerated BIE method, which is not only efficient in meshing complicated geometries, accurate for solving singular fields or fields in infinite domains, but also practical and often superior to other methods in solving large‐scale problems. The two‐dimensional Helmholtz equation with a complex wave number for non‐trivial boundary geometries has been specifically studied as a test problem. Computational tests of the numerical solutions against the conventional BIE results and exact solutions are presented. It is shown that, in the thin skin limit, the far interactions can be discarded approximately due to the rapid decay of tile kernel in the long distance.
A wireless, in‐situ ultrasonic guided wave structural health monitoring (SHM) system was developed and tested for aircraft wing inspection. It applies small, low cost and light weight piezoelectric (PZT) disc transdu...
A wireless, in‐situ ultrasonic guided wave structural health monitoring (SHM) system was developed and tested for aircraft wing inspection. It applies small, low cost and light weight piezoelectric (PZT) disc transducer network bonded to the surface of a structure, and an embedded miniature diagnosis device that can generate 350 kHz, 70 V peak‐to‐peak tone‐burst signal; collect, amplify and digitize multiple channel ultrasonic signals; and process the data on‐board and transfer them wirelessly to a ground station. The whole system could be powered by an X‐band microwave rectenna that converts illuminating microwave energy into DC. The data collected with this device are almost identical with those collected through a direct‐wire connection.
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