A team of researchers at the MPQ has pioneered the integration of erbium atoms with special optical properties into a silicon crystal. The atoms can thus be connected by light at a wavelength that is commonly used in telecommunications. ...
Optics & Photonics
Nov 7, 2022
0
551
Israeli and German researchers have developed a way to force an array of vertical cavity lasers to act together as a single laser—a highly effective laser network the size of a grain of sand. The findings are presented ...
Optics & Photonics
Sep 24, 2021
0
612
There are plenty of negatives associated with smart technology—tech neck, texting and driving, blue light rays—but there is also a positive: the digital age is not making us stupid, says University of Cincinnati social/behavioral ...
Social Sciences
Jul 2, 2021
10
182
In work that could turn cell phones into sensors capable of detecting viruses and other minuscule objects, MIT researchers have built a powerful nanoscale flashlight on a chip.
Optics & Photonics
Apr 30, 2021
2
476
Every year, an estimated 48 million Americans get sick from foodborne illnesses, resulting in some 128,000 hospitalizations and 3,000 deaths, according to the U.S. Centers for Disease Control and Prevention. This public health ...
Biotechnology
Jun 4, 2020
0
189
A team of physicists has discovered an electrical detection method for terahertz electromagnetic waves, which are extremely difficult to detect. The discovery could help miniaturize the detection equipment on microchips and ...
General Physics
Jan 27, 2020
1
5277
Tufts University engineers have developed a novel fabrication method to create dyed threads that change color when they detect a variety of gases. The researchers demonstrated that the threads can be read visually, or even ...
Materials Science
Apr 4, 2019
1
397
The piezoelectric materials that inhabit everything from our cell phones to musical greeting cards may be getting an upgrade thanks to work discussed in the journal Nature Materials released online Jan 21.
Materials Science
Jan 21, 2019
2
2010
Scientists from Stanford University and the Department of Energy's SLAC National Accelerator Laboratory have captured the first atomic-level images of finger-like growths called dendrites that can pierce the barrier between ...
Energy & Green Tech
Oct 26, 2017
3
273
University of California, Berkeley, scientists are releasing a free Android app that taps a smartphone's ability to record ground shaking from an earthquake, with the goal of creating a worldwide seismic detection network ...
Earth Sciences
Feb 12, 2016
0
1642
The telephone (from the Greek: τῆλε, tēle, "far" and φωνή, phōnē, "voice") is a telecommunications device that transmits and receives sound, most commonly the human voice. It is one of the most common household appliances in the developed world, and has long been considered indispensable to business, industry and government. The word "telephone" has been adapted to many languages and is widely recognized around the world.
The device operates principally by converting sound waves into electrical signals, and electrical signals into sound waves. Such signals when conveyed through telephone networks — and often converted to electronic and/or optical signals — enable nearly every telephone user to communicate with nearly every other worldwide. Graphic symbols used to designate telephone service or phone-related information in print, signage, and other media include ℡, ☎, ☏, and ✆.
This text uses material from Wikipedia, licensed under CC BY-SA
