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from article Thermionic emission

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Free electrons are assumed to move in approximately constant potential. (a) Occupation of electron states between the bottom of the conduction band and the Fermi level of a metal is indicated for T = 0 by the shaded area. (b) Fermi distribution…

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from article Scattering of electromagnetic radiation

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The role of interference in determining the angular dependence of light scattering from particles that are comparable in size to the wavelength.

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from article Xiphosurida

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Segmentation of Limulus polyphemus. Inconclusive evidence indicates that there are 15 segments (6 in the prosoma, 9 in the opisthosoma). The telson (XV) may be a terminal spine that has become articulated and has incorporated the anus into its base.

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from article Xiphosurida

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Phylogeny and representative species of the class Xiphosura, including the order Xiphosurida and its sister group, synziphosurines (a paraphyletic stem group).

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from article Xiphosurida

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Paleolimulus signatus, a limuline xiphosurid from the Permian of Kansas, showing appendages and book gills. Length of specimen: 1.25 cm (0.5 in.).

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from article Xiphosurida

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Carapaces of adult male Limulina. (a) Limulus polyphemus. (b) Tachypleus tridentatus. (c) Carcinoscorpius rotundicauda.

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from article Xiphosurida

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Embryonic and larval development of Limulus polyphemus. (a) Early embryo, side view. (b) Late embryo. (c) Yolk-filled digestive tract of larva. Note the segmentation of yolk in the newly hatched stage and the six lobes of digestive gland. (d) First…

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from article Xiphosurida

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Morphology of adult male Limulus polyphemus. (a) Dorsal view. (b) Ventral view, appendages not shown. (c) Cross section through prosoma showing internal anatomy. (d) Posterior view. (e) Lateral view.

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from article Feather

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Typical flight feather. (a) Full view. (b) Detail of base. (c) Detail of vane. (After J. Van Tyne and A. J. Berger, Fundamentals of Ornithology, 2d ed., John Wiley and Sons, 1976)

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from article Feather

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Parts of three barbs from a vaned feather, showing the hooking mechanism of the overlapping barbules. (After J. C. Welty, The Life of Birds, Saunders, 1962)

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from article Feather

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Types of feathers, (a) Filoplume. (b) Vane or contour. (c) Down. (d) Semiplume. (After J. C. Welty, The Life of Birds, Saunders, 1962)

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from article Feather

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Section through growing feather follicle. (After R. I. C. Spearman, The keratinization of epidermal scales, feathers, and hairs, Biol. Rev., 41:59–69, 1966)

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from article Polarized light

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Nicol prism. The ray for which Snell's law holds is called the ordinary ray.

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from article Polarized light

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Projection of light vector of constant amplitude on plane z = 0 for circularly polarized light. (a) t = 0. (b) t = π/4ω. (c) t = π/2ω. (d) t = 3π/4ω.

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from article Rigid-body dynamics

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Rotation of a symmetric rigid body around a fixed axis through the center of mass.

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from article Rigid-body dynamics

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Impulse imparted to a billiard ball by a cue stick. ( After V. D. Barger and M. G. Olsson, Classical Mechanics: A Modern Perspective, 2d ed., McGraw-Hill, New York, 1995)

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from article Rigid-body dynamics

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Wheel rolling without slipping on a level surface. (After V. D. Barger and M. G. Olsson, Classical Mechanics: A Modern Perspective, 2d ed., McGraw-Hill, New York, 1995)

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