Electronics & Semiconductors

For neural research, wireless chip shines light on the brain

Researchers have developed a chip that is powered wirelessly and can be surgically implanted to read neural signals and stimulate the brain with both light and electrical current. The technology has been demonstrated successfully ...

Software

TetGen 1.6 Release: new version of the successful mesh generator

Electromagnetic fields in magnetic resonance imaging, groundwater flows, charge carriers in semiconductors and numerous further spatially distributed physical processes have one thing in common: they can be modeled by means ...

Hardware

Reports: Intel chips have new security flaws

A pair of new security threats to Intel-based computer systems have been revealed. The beleaguered semiconductor chip manufacturer has faced a seemingly endless series of vulnerabilities over the past two years.

Hi Tech & Innovation

Bot tech controls drug release when needed

(Tech Xplore)—A study shows that that nanobots can release drugs inside your brain. The nanorobots, reported New Scientist on Thursday, are built out of DNA. Drugs can be tethered to their shell-like shapes.

Electromagnetic field

The electromagnetic field is a physical field produced by electrically charged objects. It affects the behavior of charged objects in the vicinity of the field.

The electromagnetic field extends indefinitely throughout space and describes the electromagnetic interaction. It is one of the four fundamental forces of nature (the others are gravitation, the weak interaction, and the strong interaction). The field propagates by electromagnetic radiation; in order of increasing energy (decreasing wavelength) electromagnetic radiation comprises: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

The field can be viewed as the combination of an electric field and a magnetic field. The electric field is produced by stationary charges, and the magnetic field by moving charges (currents); these two are often described as the sources of the field. The way in which charges and currents interact with the electromagnetic field is described by Maxwell's equations and the Lorentz force law.

From a classical perspective, the electromagnetic field can be regarded as a smooth, continuous field, propagated in a wavelike manner; whereas, from a quantum mechanical perspective, the field is seen as quantised, being composed of individual particles.

This text uses material from Wikipedia, licensed under CC BY-SA