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	1. Acoustic waves propagating through 12-fold quasi-periodic sonic crystals
	LU Minghui,LIU Xiaokang,NI Xu
	Physics 12 January 2012
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	Abstract:Propagation of acoustic waves through 12-fold quasi-periodic sonic crystals (QSCs) has been studied by the multiple scattering method. Flat QSC lenses can focus acoustic waves at frequencies on both sides of the first gap of transmission spectrum. We have found this focusing imaging result from local multiple scattering in QSC, which means the modulation of density and modulus among short range plays a key role in controlling acoustic waves propagating in QSC. The focusing imaging was found to have the far-field-imaging and abaxial characteristics. In some case, there are two focusing imaging in the system due to the self-similarity of quasi-crystals. In addition, localized modes have been investigated in this paper. All the characteristics of acoustic wave propagating through QSCs stated above originate from the 12-fold symmetry of QSCs.
	TO cite this article:LU Minghui,LIU Xiaokang,NI Xu. Acoustic waves propagating through 12-fold quasi-periodic sonic crystals[OL].[12 January 2012] http://en.paper.edu.cn/en_releasepaper/content/4461769


	2. The correlation between acoustic cavitation involved in ultrasound-mediated DNA transfection in vitro
	TU Juan,QIU Yuanyuan,ZHANG Yanli,CUI Weicheng,ZHANG Dong,CHEN Weizhong
	Physics 30 December 2010
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	Abstract:Background: It has been shown that the efficiency of gene/drug delivery can be enhanced under ultrasound (US) ex-posure with the presence of US contrast agent microbubbles, due to the acoustic cavitation-induced sonopration. However, obstacles still remain to achieve controllable sonopration outcome. The general hypotheses guiding present studies were that inertial cavitation (IC) activities accumulated during US exposure could be quantified as IC dose (ICD) based on passive cavitation detection (PCD), and the assessment of sonopration outcome should be correlated with ICD measurements. Methods: In current work, MCF-7 cells mixed with PEI: DNA complex were exposed to 1-MHz US pulses with 20-cycle pulse length and varied acoustic peak negative pressure (P?; 0 (sham), 0.3, 0.75, 1.4, 2.2 or 3.0 MPa), total treatment time (0, 5, 10, 20, 40 or 60 s), and pulse-repetition-frequency (PRF; 0, 20, 100, 250, 500, or 1000 Hz). Four series experiments were conducted: (1) the IC activities were detected using a PCD system and quantified as ICD; (2) the DNA transfection efficiency was evaluated with flow cytometry; (3) the cell viability was examined by PI dying then measured using flow cytometry; and (4) scan electron microscopy was used to inves-tigate the sonopration effects on the cell membrane. Results: (1) the ICD generated during US-exposure could be af-fected by US parameters (e.g., P?, total treatment time, and PRF); (2) the pooled data analyses demonstrated that DNA transfection efficiency initially increased linearly with the increasing ICD, then it tended to saturate instead of trying to achieve a maximum value while the ICD kept going up; and (3) the measured ICD, sonopration pore size, and cell viability exhibited high correlation among each other. All the results indicated that IC activity should play an important role in the US-mediated DNA transfection through sonopration, and ICD could be used as an effective tool to monitor and control the US-mediated gene/drug delivery effect.
	TO cite this article:TU Juan,QIU Yuanyuan,ZHANG Yanli, et al. The correlation between acoustic cavitation involved in ultrasound-mediated DNA transfection in vitro[OL].[30 December 2010] http://en.paper.edu.cn/en_releasepaper/content/4402666


	3. Acoustic wave propagation within the Bragg gap in periodic sound ducts
	Zhiyong Tao,Weiyu He,Yumeng Xiao,Weihe Zhang,Xinlong Wang
	Physics 14 January 2009
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	Abstract:The well-known Bragg resonance prohibits the propagation of waves in periodic waveguides. In this work we report that sound transmission within the Bragg gap can be made possible through higher-order sound modes that break through the forbidden band by the interactions of different sound modes. We perform the investigation, both theoretical and experimental, in an acoustic duct with periodically varying wall. The theoretical prediction indicates that the guided wave modes can interact in waveguides of transevrse scales comparable to wavelength, so that the forbidden band undergos an abnormal change, thus giving rise to the considerable compression in bandwidth and a sharp descent on the upper edge of the stopband. The experiment comfirms the prediction, and the measurements of the transmission loss and the radial distribution of sound field agree quite well with the theory.
	TO cite this article:Zhiyong Tao,Weiyu He,Yumeng Xiao, et al. Acoustic wave propagation within the Bragg gap in periodic sound ducts[OL].[14 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27842


	4. EMD-based extraction of signal modulation
	Fei Bao,Xinlong Wang,Zhiyong Tao,Qinfu Wang,Shuanping Du
	Physics 13 January 2009
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	Abstract:A novel approach based on the Empirical Mode Decomposition (EMD) is made to extract information of modulation from complex signals. It is shown that EMD is capable of adaptively recovering modulation components submerged by background noise, and it achieves better performance than the traditional methods. A modified EMD technique for slowly modulated signals is then developed to further alleviate the noise effect, and it yields a remarkably improved performance for demodulation. A practical example is given to demonstrate the potential application of the novel technique in acoustic feature acquisition.
	TO cite this article:Fei Bao,Xinlong Wang,Zhiyong Tao, et al. EMD-based extraction of signal modulation[OL].[13 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27704

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