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In solid-state physics of semiconductors, carrier generation and carrier recombination are processes by which mobile charge carriers ( electrons and electron holes) are created and eliminated. Carrier generation and recombination processes are fundamental to the operation of many optoelectronic semiconductor devices, such as photodiodes, light ...
Lenard window tube . Philipp Lenard wanted to see if cathode rays could pass out of the Crookes tube into the air. See diagram. He built a tube with a "window" (W) in the glass envelope made of aluminum foil just thick enough to hold the atmospheric pressure out (later called a "Lenard window") facing the cathode (C) so the cathode rays would ...
In meteorology, eyewall replacement cycles, also called concentric eyewall cycles, naturally occur in intense tropical cyclones, generally with winds greater than 185 km/h (115 mph), or major hurricanes ( Category 3 or above). When tropical cyclones reach this intensity, and the eyewall contracts are already small, some of the outer rainbands ...
A surface charge is an electric charge present on a two-dimensional surface. These electric charges are constrained on this 2-D surface, and surface charge density, measured in coulombs per square meter (C•m −2 ), is used to describe the charge distribution on the surface. The electric potential is continuous across a surface charge and the ...
Window locks and restrictions for openings were written into Independence building code roughly 20 years ago, according to Scannell. Independence Towers is older than the code though, and the city ...
Ionizing radiation. Ionizing radiation (US, ionising radiation in the UK), including nuclear radiation, consists of subatomic particles or electromagnetic waves that have sufficient energy to ionize atoms or molecules by detaching electrons from them. [1] Some particles can travel up to 99% of the speed of light, and the electromagnetic waves ...
Negative-index metamaterial. A negative-index metamaterial causes light to refract, or bend, differently than in more common positive-index materials such as glass lenses. Negative-index metamaterial or negative-index material ( NIM) is a metamaterial whose refractive index for an electromagnetic wave has a negative value over some frequency ...
Former President Donald Trump focused attacks against Vice President Kamala Harris' stances on immigration and criminal justice during his second speech since President Joe Biden dropped out of ...
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