Researchers have discovered in two-dimensional conductive systems a new effect that promises improved performance of terahertz detectors.
Optics & Photonics
May 23, 2022
0
4965
An intermediate layer consisting of a few atoms is helping to improve the transport of spin currents from one material to another. Until now, this process involves significant losses. A team from Martin Luther University ...
Nanophysics
May 10, 2022
0
179
Public schools were closed and evacuation bags packed this week as a stubborn wildfire crept within a few miles of the city of Los Alamos and its companion U.S. national security lab—where assessing apocalyptic threats ...
Environment
May 14, 2022
0
53
Over the past few years, many physicists and material scientists have been investigating superconductivity, the complete disappearance of electrical resistance observed in some solid materials. Superconductivity has so far ...
Wealth inequality is a research topic typically reserved for humans. Now, research from the Max Planck Institute of Animal Behavior and the University of Nebraska-Lincoln suggests that studying wealth inequality in animals ...
Evolution
May 03, 2022
0
111
Infectious diseases such as malaria remain a leading cause of death in many regions. This is partly because people there don't have access to medical diagnostic tools that can detect these diseases (along with a range of ...
Optics & Photonics
May 02, 2022
0
54
NUS scientists discovered that a two-dimensional (2D) semiconducting material, known as black phosphorus (BP), exhibits an electronic self-passivation phenomenon by re-arranging its vacancy defects. This may potentially enhance ...
Nanophysics
May 25, 2022
0
129
Modern energy storage devices, such as supercapacitors and batteries, have highly temperature-dependent performance. If a device gets too hot, it become susceptible to "thermal runaway." Thermal runaway—or uncontrolled ...
Analytical Chemistry
May 09, 2022
0
38
The benefits of social mobility seem to be widely agreed on. The idea that a person's opportunities and earnings should not be defined by their background is supported across the political spectrum.
Social Sciences
May 05, 2022
0
21
New in-depth analysis of UK job market data reveals women, disabled people, ethnic minorities and young workers have been consistently trapped in insecure employment over the last twenty years.
Economics & Business
May 26, 2022
0
4
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
