Researchers from the University of Twente proved that germanene, a two-dimensional material made of germanium atoms, behaves as a topological insulator. It is the first 2D topological insulator that consists of a single element. ...
Condensed Matter
May 16, 2023
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202
Most states in the U.S. allow people to use cannabis for medical or recreational purposes. Yet all states want their roadways to be safe. A breathalyzer that can accurately identify people who recently smoked cannabis might ...
Analytical Chemistry
May 22, 2023
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22
A small team of economists from Harvard University, Sihlquai 10, Adliswil, Brown University, and the London Business School has found differences in education level attainment across Africa based at least in part on religion. ...
At the end of 2022 the Central Bank of Nigeria launched new banknotes. At the same time it also capped withdrawal of the new banknotes. The rollout of the currency change was shambolic. But it also led people to turn to digital ...
Economics & Business
May 3, 2023
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1
Are we alone in the universe? It's a question that fascinates scientists and the public alike. In science, the focus tends to be on our search for life elsewhere. The idea that we might be watched by a distant alien civilization, ...
Astrobiology
May 15, 2023
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47
While a visit to the great outdoors is a common prescription for reducing screen use, a pioneering new study finds that time outdoors doesn't always reduce smartphone screentime.
Social Sciences
May 15, 2023
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70
Known as the "plant destroyer," the genus Phytophthora is considered one of the most important groups of plant pathogens—causing significant economic and environmental losses throughout history and into today. There are ...
Plants & Animals
May 24, 2023
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15
New research using remote sensing technology has delivered promising results to scientists looking for innovative ways to help nurseries combat the spread of myrtle rust.
Plants & Animals
May 16, 2023
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28
A mobile phone or mobile (also called cellphone and handphone, as well as cell phone, wireless phone, cellular phone, cell, cellular telephone, mobile telephone or cell telephone) is a long-range, electronic device used for mobile voice or data communication over a network of specialized base stations known as cell sites. In addition to the standard voice function of a mobile phone, telephone, current mobile phones may support many additional services, and accessories, such as SMS for text messaging, email, packet switching for access to the Internet, gaming, Bluetooth, infrared, camera with video recorder and MMS for sending and receiving photos and video, MP3 player, radio and GPS. Most current mobile phones connect to a cellular network consisting of switching points and base stations (cell sites) owned by a mobile network operator (the exception is satellite phones, which are mobile but not cellular).
As opposed to a radio telephone, a mobile phone offers full duplex communication, automatised calling to and paging from a public switched telephone network (PSTN), handoff (am. English) or handover (European term) during a phone call when the user moves from one cell (base station coverage area) to another. A mobile phone offers wide area service, and should not be confused with a cordless telephone, which also is a wireless phone, but only offer telephony service within a limited range, e.g. within a home or an office, through a fixed line and a base station owned by the subscriber.
The International Telecommunication Union estimated that mobile cellular subscriptions worldwide would reach approximately 4.1 billion by the end of 2008. Mobile phones have gained increased importance in the sector of Information and communication technologies for development in the 2000s and have effectively started to reach the bottom of the economic pyramid.
This text uses material from Wikipedia, licensed under CC BY-SA
