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17 Sep 2012

Volume 101, Issue 12, Articles (12xxxx)

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Appl. Phys. Lett. 101, 123901 (2012); http://dx.doi.org/10.1063/1.4751469 (4 pages)

Chin-An Lin, K. P. Huang, S. T. Ho, Mei-Wen Huang, and Jr-Hau He
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Beaming of inplane elastic waves through a subwavelength channel with periodic corrugations

Toru Takahashi, Kouhei Kuriyama, and Toshiro Matsumoto

Appl. Phys. Lett. 101, 124101 (2012); http://dx.doi.org/10.1063/1.4753801 (4 pages)

Online Publication Date: 18 September 2012

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We present an evidence of the beaming phenomenon regarding inplane elastic waves in the context of the enhanced acoustical transmission. Our simulations found emission of a long-range beam through a single subwavelength channel surrounded by periodic structures. The space-time spectral analysis of the inplane displacement field revealed that Rayleigh surface waves principally mediate the energy transmission that leads to the formation of beams. Consequently, we suggest a resonance condition for the beaming in terms of the ratio of the wavelength to the period of the structures. Our findings will be expected to foster the application to ultrasonic devices.
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43.40.-r Structural acoustics and vibration
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Controllable in vivo hyperthermia effect induced by pulsed high intensity focused ultrasound with low duty cycles

Juan Tu, Joo Ha Hwang, Tao Chen, Tingbo Fan, Xiasheng Guo, Lawrence A. Crum, and Dong Zhang

Appl. Phys. Lett. 101, 124102 (2012); http://dx.doi.org/10.1063/1.4754113 (5 pages) | Cited 1 time

Online Publication Date: 18 September 2012

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High intensity focused ultrasound (HIFU)-induced hyperthermia is a promising tool for cancer therapy. Three-dimensional nonlinear acoustic-bioheat transfer-blood flow-coupling model simulations and in vivo thermocouple measurements were performed to study hyperthermia effects in rabbit auricular vein exposed to pulsed HIFU (pHIFU) at varied duty cycles (DCs). pHIFU-induced temperature elevations are shown to increase with increasing DC. A critical DC of 6.9% is estimated for temperature at distal vessel wall exceeding 44 °C, although different tissue depths and inclusions could affect the DC threshold. The results demonstrate clinic potentials of achieving controllable hyperthermia by adjusting pHIFU DCs, while minimizing perivascular thermal injury.
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87.50.yt Therapeutic applications
87.19.Pp Biothermics and thermal processes in biology
87.19.xj Cancer

Effect of tungsten metal particle sizes on the solubility of molten alloy melt: Experimental observation of Gibbs-Thomson effect in nanocomposites

M. H. Lee, J. Das, D. J. Sordelet, J. Eckert, and A. J. Hurd

Appl. Phys. Lett. 101, 124103 (2012); http://dx.doi.org/10.1063/1.4754546 (5 pages)

Online Publication Date: 20 September 2012

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We investigated the effect of tungsten particle sizes on the thermal stability and reactivity of uniformly dispersed W particles in molten Hf-based alloy melt at elevated temperature (1673 K). The solubility of particles less than 100 nm in radius is significantly enhanced. In case of fine W particles with 20 nm diameter, their solubility increases remarkably around 700% compared to that of coarse micrometer-scale particles. The mechanisms and kinetics of this dynamic growth of particle are discussed as well as techniques developed to obtain frozen microstructure of particle-reinforced composites by rapid solidification.
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81.07.Bc Nanocrystalline materials
81.30.Fb Solidification
64.75.Bc Solubility

Separate control of the ion flux and ion energy in capacitively coupled radio-frequency discharges using voltage waveform tailoring

T. Lafleur, P. A. Delattre, E. V. Johnson, and J. P. Booth

Appl. Phys. Lett. 101, 124104 (2012); http://dx.doi.org/10.1063/1.4754692 (4 pages) | Cited 5 times

Online Publication Date: 21 September 2012

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We experimentally characterize an argon plasma in a geometrically symmetric, capacitively coupled rf discharge, excited by pulse-type tailored waveforms (generated using multiple voltage harmonics). The results confirm a number of predictions made by recent particle-in-cell simulations of a similar system and demonstrate a unique form of control over the ion flux and ion energy in capacitively coupled plasmas; by increasing the number of applied harmonics (equivalent to decreasing the pulse width), it is possible to increase the plasma density and ion flux (together with the power deposition) while keeping the average ion energy on one of the electrodes low and constant.
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52.80.Pi High-frequency and RF discharges
52.25.Fi Transport properties
52.70.Nc Particle measurements
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