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from article Delta electrons
Nuclear emulsion showing iron nucleus (Z = 26) in cosmic radiation entering from upper right and producing large numbers of delta electrons, giving its track a heavy, “hairy” appearance.
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from article Hophornbeam
Leaves of the American hophornbeam (Ostrya virginiana). (Photo courtesy of D. E. Herman, USDA–NRCS PLANTS Database)
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from article Couple
Vector properties of a couple.
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from article Couple
Equivalent couples.
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from article Illumination
Spectral response of human eye to radiation. (After W. B. Boast, Illumination Engineering, 2d ed., McGraw-Hill, 1953)
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from article Illumination
Ideal reflection. (a) Specular, such as from a polished surface. (b) Diffuse, such as from a that surface of microscopic roughness. (After W. B. Boast, Illumination Engineering, 2d ed., McGraw-Hill, 1953)
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from article Illumination
Typical reflection characteristics. (a) Practical mat surface. (b) Semimat surface. (c) Semimat surface at large angle of incidence. (d) Porcelain-enameled steel. Broken-line curves in a and d illustrate ideal cosine distribution. (After W. B.…
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from article Illumination
Spatial characteristics of ideal transmission media. (a) Specular. (b) Diffuse. (After W. B. Boast, Illumination Engineering, 2d ed., McGraw-Hill, 1953)
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from article Illumination
Transmission characteristics. (a) Solid opal glass. (b) Flashed opal glass. (c) Sand-blasted glass. (d) Sand-blasted glass, incident light at 30° from plane at surface. (After W. B. Boast, Illumination Engineering, 2d ed., McGraw-Hill, 1953)
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from article Illumination
Process of evaluating the luminous exitance of a reflecting surface after evaluating the illumination. (a) Spectral irradiation Gλcurve. (b) Spectral luminous efficiency vλ curve. (c) Curve of vλGλ. Illumination is the area under this curve, the…
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from article Banana
A single fruiting stalk produces the banana fruit bunch. (Credit: Charles T. Bryson/USDA Agricultural Research Service)
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from article Banana
Pseudostem of a commercial banana plant (Musa acuminata). (Credit: Forest and Kim Starr)
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from article Banana
Black Sigatoka disease, caused by the fungus Mycosphaerella fijiensis var. difformis, with leaf spotting and necrosis of a banana leaf. (Credit: Fred Brooks/University of Hawaii at Manoa)
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from article Isoetales
Morphology and anatomy of extant Isoetes. (a) Compact, cormose rhizomorph and unbranched stem of I. melanopoda. (b) More elongate, once-branched rhizomorph and stem of I. andicola. (After W. N. Stewart and G. W. Rothwell, Paleobotany and the…
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from article Mendelevium
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from article Electromagnetic pulse (EMP)
The explosion from the Climax test shot of Operation Upshot-Knothole, conducted in June 1953 at the Nevada Test Site. (Credit: National Nuclear Security Administration/Nevada Site Office/DOE)
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from article Electromagnetic pulse (EMP)
Total gamma source strength versus time for nominal 1-megaton surface burst. Both horizontal and vertical scales are logarithmic.
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from article Electromagnetic pulse (EMP)
Schematic representation of the EMP in a high-altitude burst. The extent of the source region varies with the altitude and the yield of the explosion.
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from article Electromagnetic pulse (EMP)
Schematic representation of the EMP in a surface burst.
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from article Electromagnetic pulse (EMP)
Typical system protection scheme.
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from article Polytrichidae
Polytrichum commune, member of the order Polytrichales, an acrocarpous perennial moss. (a) Female plant. (b) Serrate apex of leaf. (c) Male plant. (d) Cross section of leaf showing lamellae, which extend parallel to one another along the midrib of…
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from article Evaporation
In a cooling tower, hot water from a mechanical process and air come in contact, causing some of the water to evaporate (absorb heat), thereby lowering the heat of the process water. (Credit: Malcolm Fife/age fotostock)
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from article Polonium
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from article Henequen
Henequen (Agave fourcroydes). (Photo by Peter Lapshin)
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from article Carbon-nitrogen-oxygen cycles (astrophysics)
Carbon-nitrogen-oxygen cycles. (After J. Audouze, ed., CNO Isotopes in Astrophysics, D. Reidel, 1977)
