Microbubble shape oscillations excited through ultrasonic parametric driving
نویسندگان
چکیده
منابع مشابه
Microbubble shape oscillations excited through ultrasonic parametric driving.
An air bubble driven by ultrasound can become shape-unstable through a parametric instability. We report time-resolved optical observations of shape oscillations (mode n=2 to 6) of micron-sized single air bubbles. The observed mode number n was found to be linearly related to the ambient radius of the bubble. Above the critical driving pressure threshold for shape oscillations, which is minimal...
متن کاملSupporting designers' hierarchies through parametric shape recognition
The need to implement shape grammars efficiently, rather than hardcode them, in a way that supports creativity through shape emergence is an ongoing research challenge. This paper introduces a shape grammar interpreter that supports parametric subshape recognition, and thereby shape emergence. The approach divides shapes into hierarchies of subshapes based on specified geometric relationships w...
متن کاملTowards Shape Understanding through Non-Parametric Shape Warping
This paper pursues the idea of understanding shapes of unknown objects through establishing correspondence with points from the surface of known objects. A lot of geometryrelated knowledge, such as functionally correct grasps or object constellations, could thus be transferred from known shapes to novel shapes of the same or a similar category. As one critical module in such a system, this pape...
متن کاملOptically excited nanoscale ultrasonic transducers.
In order to work at higher ultrasonic frequencies, for instance, to increase the resolution, it is necessary to fabricate smaller and higher frequency transducers. This paper presents an ultrasonic transducer capable of being made at a very small size and operated at GHz frequencies. The transducers are activated and read optically using pulsed lasers and without physical contact between the in...
متن کاملPotential bioeffects of ultrasonic destruction of microbubble contrast agents.
t is well known that microbubble destruction can occur uring contrast echocardiography, primarily by acoustic avitation (1). The propensity of microbubbles to undergo his process when exposed to ultrasound depends on physcal properties of both the bubbles themselves and the ltrasound beam. Higher rarefactional peak amplitude (a easure of ultrasonic acoustic power) and lower frequencies ause gre...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review E
سال: 2010
ISSN: 1539-3755,1550-2376
DOI: 10.1103/physreve.82.026321