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from article Exposure meter
Basic exposure meter circuits. (a) Photovoltaic type circuit. (b) Photoconductive type circuit.
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from article Donor atom
Pentavalent donor atom, phosphorus (P), in the elemental semiconductor silicon (Si). (a) Phosphorus atom in a substitutional position, that is, replacing silicon, a tetravalent host atom, by completing the four tetrahedral covalent bonds with its…
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from article Pain
Neurophysiology of incoming pain. Sensation from peripheral receptors travels along specific pain nerves, and is modulated throughout the spinal cord and brain. (Copyright © McGraw-Hill Education)
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from article Radiation damage to materials
The five principal mechanisms of radiation damage are ionization, vacancies, interstitials, impurity atoms, and thermal spikes. Diagram shows how a neutron might give rise to each in copper. Grid-line intersections are equilibrium positions for…
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from article Radiation damage to materials
Sensitivity of engineering materials to radiation. Levels are approximate and subject to variation. Changes are in most cases at least 10%. (After O. Sisman and J. C. Wilson, Nucleonics, 14:58–65, 1956)
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from article Virus, defective
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from article Virus, defective
Electron micrographs of virion and defective interfering particles of vesicular stomatitis virus. (a) Defective interfering particle with a 50% deleted RNA. (b) Defective interfering particle with an 85% deleted RNA. (c, d, f) Defective interfering…
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from article Oscilloscope
Four-channel 150-MHz analog oscilloscope. (Credit: Tektronix)
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from article Oscilloscope
Sweep generator waveforms. (a) Single waveform, showing instant of trigger (T). (b) Dual time base in set-up mode: sweep by A, intensified by B. (c) Dual time base in delayed display mode: scan delayed by A, sweep by B.
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from article Oscilloscope
High-speed general-purpose digitizing oscilloscope. (Credit: Tektronix)
