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A method named covariance matrix sparse representation (CMSR) is developed to detect the number and estimate the directions of multiple, simultaneous sources by decomposing the array output covariance matrix under sparsity constraint. In CMSR the covariance matrix elements are aligned to form a new vector, which is then represented on an overcomplete spatial dictionary, and the signal number and directions...
In order to understand the effects of bone density on the mechanical properties of femoral neck and improve the effects of treatment for femoral neck fractures, this paper presents a novel method of simulating the bone density changes among individuals. In this method we adjusted the experiential equations between the bone density and gray value and then obtained the mathematical model of the change...
Semi-passive shunted piezoelectric layer for sound absorption is a typically multi-physics problem coupled with sound wave equations, structure stress-strain equations, piezoelectric constitutive equations and electric ordinary equations, and it is analyzed with FEM in detail. Frequency response characteristics are simulated when semi-passive piezoelectric sound absorption structure shunted with negative-capacitance,...
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