Image
from article Piciformes
Red-headed woodpecker (Melanerpes erythrocephalus) in Desoto National Wildlife Refuge, Iowa. (Photo by Dave Menke/U.S. Fish and Wildlife Service)
Search Results
Search Results
Refine this search
Search result paging links
5,696 results
Image
from article Otter
North American river otter (Lontra canadensis). (Credit: Alan and Sandy Carey/Getty Images)
Image
from article Otter
Sea otter (Enhydra lutris) in the water off the coast of Moss Landing, California. (Credit: Lilian Carswell/U.S. Fish and Wildlife Service)
Image
from article Mustard
Black mustard (Brassica nigra). (Photo courtesy of Jennifer Anderson, USDA–NRCS PLANTS Database)
Image
from article Exposure meter
Basic exposure meter circuits. (a) Photovoltaic type circuit. (b) Photoconductive type circuit.
Image
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…
Image
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…
Image
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)
Image
from article Nuclear reaction
Formation of the compound nucleus 14N after capture of the deuteron by 12C. Four exit channels are indicated.
Image
from article Nuclear reaction
A (d, p) transfer reaction.
Image
from article Echiura
Echiuran anatomy. (a) External anatomy, ventral view. (b) Internal anatomy, dorsal view. A, anus; AV, anal vesicles; G, gut (middle section removed for clarity); M, mouth; N, nephridia (egg and sperm storage organs); S, setae; VNC, ventral nerve…
Image
from article Asian vegetables
A head of Chinese cabbage. (Credit: Jiang Hongyan/Shutterstock)
Image
from article Asian vegetables
Bok choy, also known as pak choy or Chinese mustard. (Credit: Agricultural Research Service, U.S. Department of Agriculture)
Image
from article Asian vegetables
Daikon (oriental winter radish) is a notable vegetable in Japan. (Credit: Franco Folini)
Image
from article Asian vegetables
Mung bean sprouts.
Image
from article Asian vegetables
Chinese okra. The length of the fruit can reach 30–38 cm (12–15 in.). (Credit: Forest and Kim Starr)
Image
from article Schizomida
Schizomus sawadai. (After K. Sekiguchi and T. Yamasaki, A redescription of “Trithyreus sawadi” (Uropygi: Schizomidae) from the Bonin Islands, Acta Arachnol., 24(2):73–81, 1972)
Image
from article Oscilloscope
Four-channel 150-MHz analog oscilloscope. (Credit: Tektronix)
Image
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.
Image
from article Oscilloscope
High-speed general-purpose digitizing oscilloscope. (Credit: Tektronix)
Image
from article Notomyotida
Some diagnostic features of representative Notomyotida. (a) Paxillae and one pectinate pedicellariae of Cheiraster richardsoni. (b) Benthopecten pentacanthus.
Image
from article Adiabatic demagnetization
Entropy–temperature diagram of a paramagnetic substance, showing process of adiabatic demagnetization.
Image
from article Adiabatic demagnetization
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…
Image
from article Reciprocity principle
Antenna system.
Image
from article Reciprocity principle
Two-mesh network.
