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from article Stereophonic radio transmission
Baseband spectrum of an FM stereo signal. This audio and supersonic spectrum is frequency-modulated onto a radio-frequency carrier.
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from article Video disk
DVD operational principles.
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from article Galliformes
White-tailed ptarmigan (Lagopus leucurus), Glacier National Park, Montana. (Photo by Gerald and Buff Corsi, copyright © California Academy of Sciences)
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from article Echinoida
Tripneustes ventricosus (Lamarck), tropical eastern and western Atlantic, found at depths of 0–55 m (0–180 ft). (From G. Hendler et al., Sea Stars, Sea Urchins and Allies: Echinoderms of Florida and the Caribbean, Smithsonian Press, Washington, DC,…
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from article Echinoida
A pyramid from Aristotle's lantern, showing epiphyses joined and tooth with keel. (After H. L. Hawkins, The lantern and girdle of some Recent and fossil Echinoidea, Philos. Trans. R. Soc. Lond. Ser. B, 223:617–649, 1934)
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from article Echinoida
An ambulacral plate from the test, with the lowest element being the largest. (After T. Mortensen, A monograph of the Echinoidea: Camarodonta, C. A. Reitzel, Copenhagen, 1943)
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from article Airborne radar
Radar presentation showing a squall line extending from northwest to southeast. The range marks, indicating 5-mi (8-km) units, give estimation of extent of disturbance. (RCA Corp.)
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from article Airborne radar
High-resolution radar map of a golf course near Stockbridge, New York. (M.I.T.-Lincoln Laboratory)
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from article Mixer
Linear mixers. (a) Passive linear mixer based on a resistive summing network. (b) Active linear mixer with an operational amplifier.
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from article Mixer
Balanced modulator (nonlinear mixer). Only signal paths are shown. Biasing must be added.
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from article Euryalida
Aboral body of a basket star, Euryale aspera (family Euryalidae, order Euryalida), clinging to a red soft coral colony and spreading its branching arms.
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from article Euryalida
A snake star, Astrochele pacifica (family Gorgonocephalidae, order Euryalida): (a) aboral body; (b) aboral arms; and (c) a scanning electron microscope (SEM) image of a separated microscopic hook. (Credit for photo a: Shimoda Marine Research Center,…
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from article Systems integration
Systems integration activity, showing the architecture for the system.
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from article Systems integration
Tactical and strategic perspective of systems integration, showing essential elements.
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from article Cordaitales
Cross sections of cordaitean stems, with simple wood. Left, Cordaixylon iowensis, with septate pith. Right, Mesoxylon priapi, with solid pith. (Photographs by M. L. Trivett)
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from article Cordaitales
Shoot of Cordaixylon dumusum illustrating strap leaves and nonaxillary Cordaitanthus-type cones. (Courtesy of G. W. Rothwell)
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from article Cordaitales
Compound Gothania-type cone of Mesoxylon priapi with bracts subtending secondary shoots. (Courtesy of M. L. Trivett)
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from article Pinnipeds
Walrus (Odobenus rosmarus). (Credit: Donna Dewhurst Collection/U.S. Fish and Wildlife Service)
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from article Pinnipeds
Steller sea lion and pup (Eumetopias jubatus). (Credit: Alaska Image Library/U.S. Fish and Wildlife Service)
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from article Pinnipeds
Evolutionary relationships and stratigraphic ranges of major groups of pinnipeds. Shaded bars correspond to known ranges, and white bars correspond to inferred ranges. Ma = million years ago. (Copyright © McGraw-Hill Education)
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from article Eocrinoidea
Reconstructions of Cambrian and Ordovician eocrinoids. (a) Gogia spiralis, from the Middle Cambrian of Utah, showing the primitive holdfast; sutural pores between the numerous thecal plates; and long, spiraled brachioles attached to the summit…
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from article Wi-Fi
802.11 WiFi wireless router (access point). (Credit: Copyright © Sheval/Alamy)
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from article Wi-Fi
Wireless LAN architectures. (a) Independent basic service set. (b) Infrastructure basic service set. (c) Extended service set.
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from article Wi-Fi
Sending a data frame using carrier-sense multiple access with collision avoidance (CSMA/CA).
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from article Wi-Fi
Hidden-node problem for a wireless network.
