منابع مشابه
Degradation of DNA in high-intensity focused ultrasonic fields at 1 MHz.
Gassy and degassed aqueous solutions of DNA were treated ultrasonically while monitoring the field for discrate cavitation events. At irradiation intensities greater than about 500 W/cm 2, transient cavitation is shown to be responsible forthe observed reduction i molecular weight. At intensifies of200 to 288 W/cm 2, degradation of DNA was observed which did not depend upon transient cavitation.
متن کاملSelf-focused ZnO transducers for ultrasonic biomicroscopy.
A simple fabrication technique was developed to produce high frequency (100 MHz) self-focused single element transducers with sputtered zinc oxide (ZnO) crystal films. This technique requires the sputtering of a ZnO film directly onto a curved backing substrate. Transducers were fabricated by sputtering an 18 μm thick ZnO layer on 2 mm diameter aluminum rods with ends shaped and polished to pro...
متن کاملRadiation damage of polymers in ultrasonic fields
Radiation damage has always been a topic of great interest in various fields of sciences. In this work, an attempt is made to probe into the effect of subthreshold ultrasonic waves on the radiation damage created by irradiation of deuterons in polymer samples wherein the polymer samples act as model systems. Two equal volumes of radiation damage were produced in a single polymer sample wherein ...
متن کاملUltrasonic Measurements of Inhomogenous Stress Fields
An acoustic technique for measuring inhomogeneous stress fields in externally loaded solids is described. This method requires a measurement of transit time of a longitudinal acoustic wave through a stressed thin metal specimen using a small diameter water-coupled acoustic transducer. The transducer is mechanically scanned over the surface of the sample by a computer controlled system to take s...
متن کاملPolarization singularities of focused, radially polarized fields.
The state of polarization of strongly focused, radially polarized electromagnetic fields is examined. It is found that several types of polarization singularities exist. Their relationship is investigated, and it is demonstrated that on smoothly varying a system parameter, such as the aperture angle of the lens, different polarization singularities can annihilate each other. For example, the ev...
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ژورنال
عنوان ژورنال: The Journal of the Acoustical Society of America
سال: 1988
ISSN: 0001-4966
DOI: 10.1121/1.2025494