Electronics & Semiconductors
Researchers from UNSW Sydney have developed a tiny, transparent and flexible material to be used as a novel dielectric (insulator) component in transistors. The new material would enable what conventional silicon semiconductor ...
Aug 03, 2022
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114
Electronics & Semiconductors
Acoustic waves are slower than electromagnetic waves of the same frequency but, even in the high-speed world of computing and communications, that's not a bad thing. Short acoustic waves are easy to confine in nanoscale ...
Jun 28, 2022
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245
Engineering
Researchers at the University of Virginia School of Engineering and Applied Science have discovered a way to make a versatile thermal conductor, with promise for more energy-efficient electronic devices, green buildings and ...
Jun 21, 2022
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54
Robotics
Fireflies that light up dusky backyards on warm summer evenings use their luminescence for communication—to attract a mate, ward off predators or lure prey.
Jun 21, 2022
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92
Engineering
A research group at the Hefei Institutes of Physical Science (HFIPS) of the Chinese Academy of Sciences has developed a flow-electrode capacitive desalination technology with a three-dimensional (3D) foam current collector ...
Jun 20, 2022
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29
Robotics
A team of UCLA engineers and their colleagues have developed a new design strategy and 3D printing technique to build robots in one single step.
Jun 16, 2022
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277
Robotics
Researchers at IIT-Istituto Italiano di Tecnologia (Italian Institute of Technology) and INAIL (Italian Worker's Compensation Authority) have designed and created innovative prototypes of wearable robotic exoskeletons for ...
Jun 15, 2022
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262
Consumer & Gadgets
The human body needs sleep as much as it needs food and water. Yet many people fail to get enough, causing both mind and body to suffer. People who struggle for shut-eye could benefit from monitoring their sleep, but they ...
Jun 02, 2022
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86
Engineering
Researchers have developed 3D printed artificial heart valves designed to allow a patient's own cells to form new tissue. To form these scaffolds using melt electrowriting—an advanced additive manufacturing technique—the ...
Jun 02, 2022
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328
Electronics & Semiconductors
Some materials, like wood, are insulators that block the flow of electricity. Conductors, such as copper, allow for electricity to flow through them. Other materials—semiconductors—can be either/or depending on conditions ...
May 11, 2022
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In physics, the space surrounding an electric charge or in the presence of a time-varying magnetic field has a property called an electric field. This electric field exerts a force on other electrically charged objects. The concept of an electric field was introduced by Michael Faraday.
The electric field is a vector field with SI units of newtons per coulomb (N C−1) or, equivalently, volts per metre (V m−1). The SI base units of the electric field are kg·m·s−3·A−1. The strength of the field at a given point is defined as the force that would be exerted on a positive test charge of +1 coulomb placed at that point; the direction of the field is given by the direction of that force. Electric fields contain electrical energy with energy density proportional to the square of the field intensity. The electric field is to charge as gravitational acceleration is to mass and force density is to volume.
A moving charge has not just an electric field but also a magnetic field, and in general the electric and magnetic fields are not completely separate phenomena; what one observer perceives as an electric field, another observer in a different frame of reference perceives as a mixture of electric and magnetic fields. For this reason, one speaks of "electromagnetism" or "electromagnetic fields." In quantum mechanics, disturbances in the electromagnetic fields are called photons, and the energy of photons is quantized.
This text uses material from Wikipedia, licensed under CC BY-SA
