Category Technology/Electronics

The prototype of the dual frequency charger is a thin, rectangular box (12.5 centimeters × 8.9 centimeters) that contains two transmitter coils: an inner coil optimized to operate at a frequency of 200 kHz (orange), and an outer coil optimized to operate at 6.78 MHz (red). The prototype setup is pictured with the two receiver coils off the charging platform (top) and side by side on the platform (bottom). The transmitter coils and receiver coils are attached to green circuit boards. Credit: UC San Diego Jacobs School of Engineering

Uni of CA, SD Electrical engineers have developed a dual frequency wireless charging platform that could be used to charge multiple devices, such as smartphones, smartwatches, laptops and tablets, at the same time – regardless of which wireless standard, or fre...

New OCT tool to study how diseases like dementia, Alzheimer’s, and brain tumors change brain tissue over time. “In the brain, the imaging depth is almost doubled,” said Martin Leahy of the National University of Ireland, Galway. “The authors demonstrate for the first time an application in which this capability opens up a whole new window into the live intact hippocampus, for discovery in brain research.”

From the experimental findings, the authors envision that this new optical coherence tomography (OCT) approach to brain study may enable examination of acute and chronic morphological or functional vascular changes in the deep brain, which has been rarely attempted before in the OCT community.

Choi and Wang used swept-source OCT (SS-OCT) powered by a vertical-cavity surface-emitting...

The fiber sensor. Credit: ETRI

The researchers, from Electronics and Telecommunications Research Institute and Konkuk University in the Republic of Korea, coated cotton and polyester yarn with a nanoglue called bovine serum albumin (BSA). The yarns were then wrapped in graphene oxide sheets.

The graphene sheets stuck very well to the nanoglue – so much so that further testing showed the fabrics retained their electrical conducting properties after 1,000 consecutive cycles of bending and straightening and 10 washing tests with various chemical detergents. Finally, the graphene oxide yarns were exposed to a chemical reduction process, which involves the gaining of electrons.

The reduced-graphene-oxide-coated materials were found to be particularly sensitive to detecting NO2, a pollutant gas ...

Conceptual representations of magnetic phases in MnSi and the experimental set-up.

RIKEN Center for Emergent Matter Science may be about to wind back time. Skyrmions have been widely touted as providing the basis for new high-density memory devices because of their small size and relative stability. However, it has proven difficult to create, delete, and move them, and skyrmion-based devices are not yet competitive with other high-tech devices based on spin.

The group set out to work using a specially designed stress probe that could apply mechanical stress to the surface of manganese-silicide, a “chiral magnetic” that is known to host skyrmions, cooled to very low temperature...