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Categories: Engineering: Biometric, Physics: Acoustics and Ultrasound
Published Testing 1-2: New laser-based microphone calibration measures up
(via sciencedaily.com) Researchers have conducted the first demonstration of a faster and more accurate way to calibrate certain kinds of microphones. The technique, which uses lasers to measure the velocity at which a microphone's diaphragm vibrates, performs well enough to overtake one of the main calibration methods used.
Published Compact speaker systems direct sound efficiently
(via sciencedaily.com) Researchers have developed three designs for compact speaker systems that control the direction of sound more efficiently than previous models. For each speaker, the scientists were able to manipulate the timing and strength of the outgoing sound waves. They combined multiple speakers together into an array and used the constructive and destructive interference of sound waves to their advantage.
Published Researchers developing new cancer treatments with high-intensity focused ultrasound
(via sciencedaily.com) While doctors have used low-intensity ultrasound as a medical imaging tool since the 1950s, experts are now using and extending models that help capture how high-intensity focused ultrasound (HIFU) can work on a cellular level.
Published Wind turbine night noise
(via sciencedaily.com) With wind generation one of the fastest-growing renewable energy sectors in the world, experts are using machine learning and other signal processing techniques to characterize annoying noise features from wind farms. Two new publications from the ongoing Wind Farm Noise Study take another step towards improving wind turbine noise assessment methods, guidelines and wind turbine design to make wind energy more acceptable to surrounding communities.
Published Prediction models may reduce false-positives in MRI breast cancer screening
(via sciencedaily.com) Prediction models based on clinical characteristics and imaging findings may help reduce the false-positive rate in women with dense breasts who undergo supplemental breast cancer screening with MRI, according to a new study.
Published Built-in vibration control may help soundproof spaces
(via sciencedaily.com) Original source A different kind of design for absorbing vibrations could help better soundproof walls and make vehicles more streamlined, a new study shows.
Published Does visual feedback of our tongues help in speech motor learning?
(via sciencedaily.com) When we speak, we use our auditory and somatosensory systems to monitor the results of the movements of our tongue or lips. Since we cannot typically see our own faces and tongues while we speak, however, the potential role of visual feedback has remained less clear. Researchers explore how readily speakers will integrate visual information about their tongue movements during a speech motor learning task.
Published Researchers demonstrate technique for recycling nanowires in electronics
(via sciencedaily.com) Researchers have demonstrated a low-cost technique for retrieving nanowires from electronic devices that have reached the end of their utility and then using those nanowires in new devices. The work is a step toward more sustainable electronics.
Published Soft skin patch could provide early warning for strokes, heart attacks
(via sciencedaily.com) Engineers developed a soft, stretchy ultrasound patch that can be worn on the skin to monitor blood flow through vessels deep inside the body. Such a device can make it easier to detect cardiovascular problems, like blockages in the arteries that could lead to strokes or heart attacks.
Published Air-powered computer memory helps soft robot control movements
(via sciencedaily.com) Original source Engineers made a pneumatic RAM chip using microfluidic valves instead of electronic transistors. The valves remain sealed against a pressure differential even when disconnected from an air supply line, creating trapped pressure differentials that function as memories and maintain the states of a robot's actuators. Dense arrays of these valves can perform advanced operations and reduce the expensive, bulky, and power-consuming electronic hardware typically used to control pneumatic robots.
Published Magnetic field from MRI affects focused-ultrasound-mediated blood-brain barrier
(via sciencedaily.com) Researchers have found that the magnetic field of the MRI scanner decreased the BBB opening volume by 3.3-fold to 11.7-fold, depending on the strength of the magnetic field, in a mouse model.
Published Face off for best ID checkers
(via sciencedaily.com) The Glasgow Face Matching Test has been updated to find super-recognizers who can help prevent errors caused by face recognition software.
Published A tiny device incorporates a compound made from starch and baking soda to harvest energy from movement
(via sciencedaily.com) Scientists have used a compound made from a starch derivative and baking soda to help convert mechanical to electrical energy. The approach is cost-effective and biocompatible, and can help charge low-energy electronics like calculators and watches.
Published AI system-on-chip runs on solar power
(via sciencedaily.com) Engineers have developed an integrated circuit that can carry out complicated artificial-intelligence operations like face, voice and gesture recognition and cardiac monitoring. Powered by either a tiny battery or a solar panel, it processes data at the edge and can be configured for use in just about any type of application.
Published New tool activates deep brain neurons by combining ultrasound, genetics
(via sciencedaily.com) A team has developed a new brain stimulation technique using focused ultrasound that is able to turn specific types of neurons in the brain on and off and precisely control motor activity without surgical device implantation.
Published Ultrafast, on-chip PCR could speed diagnosis during current and future pandemics
(via sciencedaily.com) Researchers have developed a plasmofluidic chip that can perform PCR in only about 8 minutes, which could speed diagnosis during current and future pandemics.
Published Silicon chips combine light and ultrasound for better signal processing
(via sciencedaily.com) High-end wireless and cellular networks rely on light for the distribution of signals. The selective processing of such signals requires long delays: too long to support on a chip using light alone. A research team brought together light and ultrasonic waves to realize ultra-narrow filters of microwave signals, in silicon integrated circuits. The concept allows large freedom for filters design.
Published Tiny, wireless, injectable chips use ultrasound to monitor body processes
(via sciencedaily.com) Researchers report that they have built what they say is the world's smallest single-chip system, consuming a total volume of less than 0.1 mm3. The system is as small as a dust mite and visible only under a microscope. In order to achieve this, the team used ultrasound to both power and communicate with the device wirelessly.
Published Release of drugs from a supramolecular cage
(via sciencedaily.com) How can a highly effective drug be transported to the precise location in the body where it is needed? Chemists now present a solution using a molecular cage that opens through ultrasonification.
Published Focused ultrasound enables precise noninvasive therapy
(via sciencedaily.com) New research demonstrates that noninvasive neuromodulation via low-intensity ultrasound can have cell-type selectivity in manipulating neurons.