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from article Zone refining
Zone refining. (a) Passage of a molten zone along the material to be purified. (b) Effect of 1, 5, and 10 zone passes on the impurity distribution along the material.
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from article Zone refining
Industrial techniques. (a) Zone refining on a water-cooled hearth. (b) Electron-beam zone-refining arrangement. (After R. F. Bunshah, ed., Techniques of Metals Research, vol. 1, John Wiley and Sons, 1968)
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from article Brittleness
Energy absorbed during fracture versus temperature. Brittle materials absorb much lower energy during fracture than ductile or tough materials. Some materials exhibit a brittle-to-ductile transition that depends on the test temperature.
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from article Brittleness
Scanning electron microscope image of a transgranular cleavage fracture surface in a steel tested at a temperature below its brittle-to-ductile transition. The arrow indicates the likely fracture initiation site.
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from article Frequency multiplier
Varactor-diode multiplier.
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from article Frequency multiplier
Locked-oscillator frequency multiplier.
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from article Acoustic impedance
Mechanical system used to interpret acoustic impedance.
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from article Apraxia
Language skills involve comprehension, speech, reading, and writing. The motor speech area (Broca's area) in the brain initiates speech motor functions. The Wernicke area aids in the interpretation of language. The primary motor cortex is…
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from article Nanotechnology
Graphene structure. One-atom-thick sheets of carbon known as graphene are promising materials in nanotechnology for applications ranging from electronics to medicine. (Credit: Bumbasor/iStockphoto/Getty Images)
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from article Nanotechnology
Simulation of a carbon nanotube–based gear. (Credit: NASA Ames Research Center)
