نتایج جستجو برای: acoustic wave technology
تعداد نتایج: 747260 فیلتر نتایج به سال:
The rapid expansion of the wireless market has led to a huge growth of more advanced mobile communication systems. Especially, the miniaturized mobile phones have been developed that have multi-functions with higher operating frequencies. Complying with the recent trends, there has been a great demand particularly for ultra-miniaturization and monolithic integration of RF filters as one of core...
PURPOSE: Current indices of risk evaluation for abdominal wall reconstruction focus on thickness and fat measurements, but do not address abdominal wall elasticity and texture assessment. Acoustic-Radiation-Forced-ImpulseShear-Wave-Velocity (ARFI-SWV) is a novel technology to assess skeletal muscle tissue characteristics. This technique has not assessed the abdominal wall physiology for reconst...
PURPOSE: Current indices of risk evaluation for abdominal wall reconstruction focus on thickness and fat measurements, but do not address abdominal wall elasticity and texture assessment. Acoustic-Radiation-Forced-ImpulseShear-Wave-Velocity (ARFI-SWV) is a novel technology to assess skeletal muscle tissue characteristics. This technique has not assessed the abdominal wall physiology for reconst...
Slow magneto-acoustic waves are often observed in polar plumes and active region fan loops. The observed periodicities of these waves are in the range of 1- 40 minutes. Mainly, the ratio of damping time to the oscillation period is less than 2 (equal to the ratio damping length to the wave length), which corresponds to the strong damping regime. In general, slow magneto-acoustic waves can be da...
Porous materials have good acoustic damping characteristics over a wide frequency range. As for sound waves, many small-scale pores in the coating materials can convert underwater-coating to rough surfaces. The main property of porous absorbents is their resistance against incident sound wave that leads to damping effect. From a physical point of view, damping occurs due to friction between flu...
Underwater acoustics is widely used in many applications, such as oceanography, marine biology, hydrography, fishery, etc. Different models are introduced to simulate the underwater acoustic propagation in the oceans and the seas. In this study, the Ray Theory model is used to simulate the acoustic wave propagation in a shallow-freshwater river (Gono River) located in western part of Japan. The...
Materials with designed microscale architectures, like microlattices, can achieve extreme mechanical properties. Most studies of microlattices focus on their quasistatic response, but their structural dimensions naturally prime them for ultrasonic applications. Here we report that microlattices constitute a class of acoustic metamaterials that exploit elastoacoustic hybridization to tailor ultr...
As the infrastructure for people’s production and life, stable operation of power facilities is very important. a key equipment in facilities, transformers have become important daily maintenance sector. In past, electric personnel mostly used on-site visual inspection to preliminarily judge whether transformer operating normally. The disadvantage this method inaccuracy. A condition monitoring ...
Metasurfaces are a family of novel wavefront-shaping devices with planar profile and subwavelength thickness. Acoustic metasurfaces with ultralow profile yet extraordinary wave manipulating properties would be highly desirable for improving the performance of many acoustic wave-based applications. However, designing acoustic metasurfaces with similar functionality to their electromagnetic count...
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