The experimental validation of an efficient iterative technique for compensating known position errors in a spherical near to far-field transformation (NTFFT) for elongated antennas using a minimum number of near-field (NF) measurements has been provided. This transformation exploits a non-redundant sampling representation of the voltage detected by the probe obtained by modeling a long antenna with a prolate ellipsoid.
It's really surprising: it turns out that among simple electronic circuits, built of just a few components, many of them behave chaotically, in an extremely complicated, practically unpredictable manner. Physicists from the Institute of Nuclear Physics Polish Academy of Sciences in Cracow have discovered, examined and described dozens of new, unusual circuits of this type. What is especially interesting is that one of the circuits generates voltage pulses very similar to those produced by neurons, only it does so a thousand times faster.
Researchers found that about 40 percent of adolescents in 2015 slept less than seven hours a night, which is 58 percent more than in 1991 and 17 percent more than in 2009. They further learned that the more time young people reported spending online, the less sleep they got. Teens who spent five hours a day online were 50 percent more likely to not sleep enough than their peers who only spent an hour online each day.
Slow internet speeds and the Internet 'rush hour' -- the peak time when data speeds drop by up to 30 percent -- could be history with new hardware designed and demonstrated by UCL researchers that provides consistently high-speed broadband connectivity.
Researchers have demonstrated the first laser cavity that can confine and propagate light in any shape imaginable, even pathways with sharp bends and angles. The new cavity, called a topological cavity, could enable laser components to be packed more densely on a chip, leading to higher speed optical communication technologies that can be fabricated in an efficient and scalable manner using photonic integration techniques.
Researchers analyzed Google search trends to identify consumer demand for a brand-new tobacco product known as heat-not-burn tobacco and found that its popularity is growing quickly.
NICT has successfully demonstrated a world-record for switching capacity of 53.3 Tb/s for short-reach data-center networks. This demonstration makes use of spatial division multiplexing (SDM) over multi-core optical fibers (MCFs) and a newly developed high-speed spatial optical switch system, enabling full packet-granularity.
Researchers at Columbia Engineering and UT-Austin continue to break new ground in developing magnet-free non-reciprocal components in modern semiconductor processes. They have built the first magnet-free non-reciprocal circulator on a silicon chip that operates at millimeter-wave frequencies, enabling circulators to be built in conventional semiconductor chips and operate at millimeter-wave frequencies, enabling full-duplex or two-way wireless.
New vehicle infotainment systems take drivers' eyes and attention off the road and hands off the wheel for dangerous periods of time, according to new research from the AAA Foundation for Traffic Safety.
Researchers from the Singapore University of Technology and Design (SUTD) have uncovered the detrimental effects of excessive interaction and network connections in a wide range of living and engineered systems.