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The latest Messages 10
2023-03-15 05:05:10
By reducing the contribution of all noises other than shot noise, researchers move closer to achieving quantum-noise-limited laser interferometry measurements. Source: Click here
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@Physics | @Education
2.9K views02:05
2023-03-14 04:57:58
A resonant-tunneling diode (RTD) is a diode with a resonant-tunneling structure in which electrons can tunnel through some resonant states at certain energy levels. The current–voltage characteristic often exhibits negative differential resistance regions.
All types of tunneling diodes make use of quantum mechanical tunneling. Characteristic to the current–voltage relationship of a tunneling diode is the presence of one or more negative differential resistance regions, which enables many unique applications. Tunneling diodes can be very compact and are also capable of ultra-high-speed operation because the quantum tunneling effect through the very thin layers is a very fast process. One area of active research is directed toward building oscillators and switching devices that can operate at terahertz frequencies.━━━━━━━━━━━
@Physics | @Education
80 views01:57
2023-03-13 05:21:34
A novel hydrogel combined with transplanted neural stem cells could help reconstruct new tissue in areas of brain damage. Source: Click here
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@Physics | @Education
776 viewsedited 02:21
2023-03-12 07:02:45
The heliosphere is the magnetosphere, astrosphere, and outermost atmospheric layer of the Sun. It takes the shape of a vast, bubble-like region of space. In plasma physics terms, it is the cavity formed by the Sun in the surrounding interstellar medium. The "bubble" of the heliosphere is continuously "inflated" by plasma originating from the Sun, known as the solar wind. Outside the heliosphere, this solar plasma gives way to the interstellar plasma permeating the Milky Way. As part of the interplanetary magnetic field, the heliosphere shields the Solar System from significant amounts of cosmic ionizing radiation; uncharged gamma rays are, however, not affected. Its name was likely coined by Alexander J. Dessler, who is credited with the first use of the word in scientific literature in 1967. The scientific study of the heliosphere is heliophysics, which includes space weather and space climate.━━━━━━━━━━━
@Physics | @Education
1.2K views04:02
2023-03-11 04:03:18
The Parker Solar Probe (PSP; previously Solar Probe, Solar Probe Plus or Solar Probe+) is a NASA space probe launched in 2018 with the mission of making observations of the outer corona of the Sun. It will approach to within 9.86 solar radii (6.9 million km or 4.3 million miles) from the center of the Sun, and by 2025 will travel, at closest approach, as fast as 690,000 km/h (430,000 mph), or 0.064% the speed of light. It is the fastest object ever built.━━━━━━━━━━━
@Physics | @Education
267 views01:03
2023-03-10 04:21:19
Quantum geometry plays a key role in allowing twisted bilayer graphene to become a superconductor, according to new experiments. Source: Click here
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@Physics | @Education
723 views01:21
2023-03-09 04:43:04
3D model of pancreatic cancer reveals how the static magnetic field may influence tumour response in MR-guided radiotherapy. Source: Click here
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@Physics | @Education
1.9K views01:43
2023-03-08 03:31:40
Baby shellfish use photonic nanospheres overlying their eye pigments to make themselves appear completely transparent and hide from predators. Source: Click here
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@Physics | @Education
1.2K viewsedited 00:31
2023-03-07 05:10:54
A tunnel diode or Esaki diode is a type of semiconductor diode that has effectively "negative resistance" due to the quantum mechanical effect called tunneling. It was invented in August 1957 by Leo Esaki, Yuriko Kurose, and Takashi Suzuki when they were working at Tokyo Tsushin Kogyo, now known as Sony. In 1973, Esaki received the Nobel Prize in Physics, jointly with Brian Josephson, for discovering the electron tunneling effect used in these diodes. Robert Noyce independently devised the idea of a tunnel diode while working for William Shockley, but was discouraged from pursuing it. Tunnel diodes were first manufactured by Sony in 1957, followed by General Electric and other companies from about 1960, and are still made in low volume today.━━━━━━━━━━━
@Physics | @Education
1.5K views02:10
2023-03-06 05:32:57
A Gunn diode, also known as a transferred electron device (TED), is a form of diode, a two-terminal semiconductor electronic component, with negative resistance, used in high-frequency electronics. It is based on the "Gunn effect" discovered in 1962 by physicist J. B. Gunn. Its largest use is in electronic oscillators to generate microwaves, in applications such as radar speed guns, microwave relay data link transmitters, and automatic door openers.━━━━━━━━━━━
@Physics | @Education
751 views02:32
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