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from article Donor atom

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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 Radiation damage to materials

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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

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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 Acanthodii

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Jaws of an Early Devonian ischnacanthid from northern Canada. The upper palatoquadrate and lower meckelian cartilages have tooth-bearing jawbones along their facing edges. (From University of Alberta, Laboratory for Vertebrate Paleontology…

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from article Acanthodii

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Examples of acanthodians from the Early Devonian of northern Canada. (a) Primitive climatiiform Lupopsyrus. (b) Diplacanthid Tetanopsyrus. (c) Ischnacanthiform Ischnacanthus. (d) Unnamed mesacanthid acanthodiform. (From the University of Alberta,…

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from article Nuclear reaction

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Formation of the compound nucleus 14N after capture of the deuteron by 12C. Four exit channels are indicated.

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from article Oscilloscope

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Four-channel 150-MHz analog oscilloscope. (Credit: Tektronix)

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from article Oscilloscope

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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

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High-speed general-purpose digitizing oscilloscope. (Credit: Tektronix)

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from article Data structure

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A stack, a linear list in which elements are inserted or deleted only at one end.

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from article Data structure

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A queue, a linear list that permits insertion at one end and deletion at the other.

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from article Data structure

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Singly linked list or one-way chain.

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from article Data structure

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Diagram representing a directed graph.

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from article Data structure

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Linked storage representation for a binary tree.

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from article Adiabatic demagnetization

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Entropy–temperature diagram of a paramagnetic substance, showing process of adiabatic demagnetization.

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from article Adiabatic demagnetization

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Low-temperature part of two-stage nuclear refrigerator with superconducting magnets. Demagnetization of the second stage from an initial magnetic field of 9 teslas gave measured electronic temperatures of 10–12 μK. (After F. Pobell, Matter and…

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from article Cotton effect

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Behavior of the ORD and CD curves in the vicinity of an absorption band at wavelength λ0 (idealized). (a) Positive Cotton effect. (b) Negative Cotton effect.

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