Vibrothermogrphy is a promising technique that uses ultrasonic elastic waves to locally stimulate defects on solids specimens and is typically applied in the aerospace and automotive industries. This technique allows for defect selective imaging using thermal waves that are generated by ultrasound waves. The mechanism involved is frictional heating or hysteresis that turns a dynamically loaded ...

Abstract

Modern Implantable Medical Devices (IMDs) are vulnerable to security attacks because of their wireless connectivity the outside world. One main challenges is establishing trust between IMD and an external reader/programmer in order facilitate secure communication. Numerous device-pairing schemes have been proposed address this specific challenge. However, they alone cannot protect against a bat...

Physiotherapists who work in respiratory care spend a great deal of time developing expertise in the use of a range of assessment tools including: observation, palpation, auscultation and percussion. Further specialist skills are needed for the interpretation of arterial blood gas (ABG); chest radiographs (CXR) and computed tomography (CT), in order to ensure the most accurate diagnosis can be ...

The use of ultrasound is fundamental to the practice of urology. In order for urologists to best use this technology on behalf of their patients, they must have a thorough understanding of the physical principles of ultrasound. Understanding how to tune the equipment and to manipulate the transducer to achieve the best-quality image is crucial to the effective use of ultrasound. The technical s...

Sequential ultrasound-microwave associated extraction (SUMAE) is a combination of ultrasound waves and microwaves energies in which ultrasonic extraction is used as a pretreatment. It was performed to extract essential oil from Zataria multiflora. The extraction conditions were optimized by response surface methodology (RSM) and Central Composite Design (CCD). The antioxidant and antibacterial ...

Invisibility devices based on coordinate transformation have opened up a new field of considerable interest. We present here the first practical realization of a low-loss and broadband acoustic cloak for underwater ultrasound. This metamaterial cloak is constructed with a network of acoustic circuit elements, namely, serial inductors and shunt capacitors. Our experiment clearly shows that the a...