Universal, safe and reliable water access is a pressing need in the global south. One-quarter of the world's population don't currently have access to clean drinking water. In Ghana, about 5 million people out of a total ...
Economics & Business
Feb 2, 2023
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2
A team of researchers has developed a new acoustic waveguide based on the mathematical concept of topology, which will lead to reduced energy consumption in many everyday electronic devices.
Condensed Matter
Jan 30, 2023
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9
Throughout history and across the globe, individuals have been forced to flee conflicts, natural disasters and political oppression. An experience of trauma and new horizons that is at once both collective and individual. ...
Social Sciences
Jan 13, 2023
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22
A few years—or sometimes even just a few weeks—can be all it takes for a plant or animal to acquire "endangered species" status. For instance, when a new road is built through a forest, the chainsaws come out and a rare ...
Ecology
Jan 12, 2023
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18
An orange-sized space rock which blazed across the skies January 9 probably didn't make it to Earth.
Astronomy
Jan 11, 2023
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39
The electronic and optical devices that we use on a daily basis, such as mobile phones, LEDs and solar cells use transistors and other parts that are consistently getting smaller and more compact. With an ever-growing need ...
Optics & Photonics
Jan 10, 2023
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152
Since the first of August 2022, using mobile phones for non-educational purposes is forbidden in the classroom. A doctoral thesis from the University of Gothenburg shows that the law is problematic. The pupils need the mobile ...
Education
Dec 13, 2022
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23
Australia on Monday started building a vast network of antennas in the Outback, its section of what planners say will eventually become one of the most powerful radio telescopes in the world.
Astronomy
Dec 5, 2022
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51
Few laws from Los Angeles City Hall spark as much debate as those dealing with homelessness. Look no further than the city's controversial ordinance banning camping in certain public places, which became a hot-button issue ...
Social Sciences
Dec 1, 2022
0
6
Most species are transitory. They go extinct, branch into new species or change over time due to random mutations and environmental shifts. A typical mammalian species can be expected to exist for a million years. Modern ...
Social Sciences
Nov 30, 2022
0
2
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
