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Ultrasound is defined by the American National Standards Institute as "sound at frequencies greater than 20 kHz". In air at atmospheric pressure, ultrasonic waves have wavelengths of 1.9 cm or less. Ultrasound can be generated at very high frequencies; ultrasound is used for sonochemistry at frequencies up to multiple hundreds of kilohertz.
A television screen shows ultrasound images of a fetus. As the images of an abortion appear on the screen, Nathanson describes step-by-step what is taking place, pointing out new instruments that are introduced into the uterus. The suction cannula is described as a lethal weapon that will "dismember, crush, and destroy" the child. He narrates ...
Lego Education unveiled SPIKE Prime. SPIKE Prime is the newest hands-on STEAM (Science, Technology, Engineering, Arts, Math) product, unveiled by Lego Education. It brings together Lego bricks and a programmable Hub with sensors and motors. An app works with the hub to allow children to build programs containing lessons that have been designed ...
The following is an episode list for the American television sitcom Step by Step. The series originally ran for six seasons on ABC from September 20, 1991 to August 15, 1997, then moving to CBS for its seventh and final season from September 19, 1997, to June 26, 1998. A total of 160 episodes were produced, spanning seven seasons. Series overview Season Episodes Originally released First ...
Ultrasound computer tomographs use ultrasound waves to create images. In the first measurement step, a defined ultrasound wave is generated with typically Piezoelectric ultrasound transducers, transmitted in direction of the measurement object and received with other or the same ultrasound transducers. While traversing and interacting with the ...
The collapse of these bubbles is an almost adiabatic process, thereby resulting in the massive build-up of energy inside the bubble, resulting in extremely high temperatures and pressures in a microscopic region of the sonicated liquid. The high temperatures and pressures result in the chemical excitation of any matter within or very near the ...
Contrast-enhanced ultrasound (CEUS) is the application of ultrasound contrast medium to traditional medical sonography. Ultrasound contrast agents rely on the different ways in which sound waves are reflected from interfaces between substances. This may be the surface of a small air bubble or a more complex structure.
Hermann Frenzel and H. Schultes put an ultrasound transducer in a tank of photographic developer fluid. They hoped to speed up the development process. They hoped to speed up the development process. Instead, they noticed tiny dots on the film after developing and realized that the bubbles in the fluid were emitting light with the ultrasound ...