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from article Civet
Owston's palm civet (Chrotogale owston). (Photo copyright © by Mark Kostich)
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from article Medical waste
The uniform international biohazard symbol.
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from article Patellogastropoda
Whitecap limpet (Acmaea mitra). (Photo by Douglas Eernisse)
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from article Patellogastropoda
Ribbed Mediterranean limpet (Patella ferruginea). (Photo by Georgina Rivera Ingraham)
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from article Patellogastropoda
Radula of the patellogastropod Notoacmea scapha.
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from article Ion beam mixing
Ion beam mixing of film and substrate. (a) Before ion bombardment. (b) Partial intermixing. (c) Complete intermixing.
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from article Ion beam mixing
Ion beam mixing of alternating films.
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from article Bicosoecida
A bicosoecid, Codomonas annulata.
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from article Rhizocephala
Loxothylacus texanus (arrow) attached to the abdomen of the blue crab (Callinectes sapidus). (After E. G. Reinhard, Parasitic castration of Callinectes, Exp. Parasitol., 5:79–107, 1956)
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from article Polychaeta
Examples of polychaetes. (a) Platynereis dumerilii antipoda. (b) Branchiomma sp. (c) Arenicola bombayensi. (After P. L. Beesley et al., 2000)
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from article Polychaeta
Platynereis dumerilii antipoda, showing the antero-dorsal end with the pharynx everted. (After P. L. Beesley et al., 2000)
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from article Polychaeta
Hololepidella laingensis; scanning electron microscope view of the anterior end with the pharynx everted. An: antennae; Pa: palps; Prb: proboscis; Prs: prostomium; TeC: tentacular cirrus. Numbers refer to the segments of the trunk. Magnification,…
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from article Polychaeta
Gastrolepidia clavigera; scanning electron microscope view of the anterior end. Mo: mouth; Ja: jaw; Pa: palps; Prb: proboscis. Magnification, 30×.
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from article Polychaeta
Gastrolepidia clavigera, scanning electron microscope view of the two first parapodia (Pa1, Pa2). Ch: chaetae; Ci: cirrus; Nop: notopodium; Nep: neuropodium. Magnification, 40×.
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from article Polychaeta
Section through a polychaete. (After E. E. Ruppert and R. D. Barnes, Invertebrate Zoology, Saunders College Publishing, Orlando, 1994)
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from article Hazardous waste
Inspector determining the compliance status of a facility that generates and handles hazardous waste. (Credit: West Virginia Department of Environmental Protection)
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from article Chaetonotida
Marine gastrotrichs of the order Chaetonotida; dorsal views. (a) Xenotrichula (courtesy of W. D. Hummon). (b) Chaetonotus (after W. D. Hummon, Intertidal marine Gastrotricha from Colombia, Bull. Mar. Sci., 24:396–408, 1974).
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from article Azeotropic distillation
Schematic representation of the residue curve map for nonazeotropic ternary mixtures.
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from article Azeotropic distillation
Schematic representation of the residue curve maps for ternary mixtures with one minimum-boiling binary azeotrope. (a) Azeotrope between the lowest- and highest-boiling components. (b) Azeotrope between the intermediate- and highest-boiling…
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from article Azeotropic distillation
Classical extractive distillation of ethanol and water using ethylene glycol as entrainer. (a) Residue curve map. Temperatures shown are the normal boiling points of the pure components and the azeotrope. Binary azeotropic composition is not drawn…
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from article Azeotropic distillation
Typical sequence of columns for heterogeneous azeotropic distillation, for example, ethanol + water + benzene (entrainer).
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from article Capability maturity modeling
Capability Maturity Models: the continuous representation.
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from article Capability maturity modeling
Organizational maturity levels.
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from article Capability maturity modeling
Capability Maturity Models: the staged representation.
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from article Capability maturity modeling
CMMI model evolution.
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from article Energy storage
Specific range of vehicles using energy stored in various forms. 1 mi/ft3 = 57 km/m3.
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from article Energy storage
Concept of an underground pumped hydroelectric storage system.
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from article Energy storage
Schematic diagram of compressed-air storage plant at Huntorf, Germany.
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from article Energy storage
Schematic diagram of zinc-chloride battery, showing two main compartments in the design, the battery stack and the chlorine hydrate store. (a) Charge cycle. (b) Discharge cycle. (Gulf and Western Co.)
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from article Energy storage
Impact of solar-electric generation on utility load curve during a typical 24-h period.
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from article Star tracker
Strapdown satellite star tracker. (a) Mounting of system on the satellite. (b) Star tracker in housing. (Northrop Grumman Corp.)
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from article Star tracker
Silicon focal-plane arrays. (Northrop Grumman Corp.)
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from article Skink
Five-lined skink (Plestiodon fasciatus; formerly Eumeces fasciatus). (Credit: George W. Robinson; copyright © California Academy of Sciences)
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from article Machining
Broach cutting a small chip from a workpiece.
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from article Machining
Critical items on a drill point and their geometry. (a) End view. (b) Side view. (c) Side view, with drill rotated 90° about its axis from the position shown in b.
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from article Machining
Formation of turning chips as a single-point tool contacts the exterior of the spinning workpiece.
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from article Machining
Action of a grinding wheel, showing how individual grains of the wheel produce chips from a workpiece.
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from article Machining
Configuration of a centerless grinding wheel.
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from article Machining
Creep-feed grinding process.
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from article Machining
Electric-discharge, or electric-spark, machining process. (Elox Corporation of Michigan)
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from article Machining
Gear hobbing operation; rotation of the hob and gear blank is synchronized and continuous. (After J. G. Bralla, ed., Handbook of Product Design for Manufacturing, McGraw-Hill, 1986)
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from article Ventilation
Roof exhausts for natural ventilation. (a) Cross section of round ventilator and (b) of rotating-head ventilator. (c) Continuous roof ventilator.
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from article Ventilation
Building cross section illustrating motivating convection head (height) for natural ventilation.
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from article Ventilation
Factory-assembled ventilating unit.
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from article Ventilation
Mechanically powered roof air supply unit. For summer ventilation, the portion shown in solid lines is used. Heater and dampers are for winter use. Diffuser outlet improves air distribution into ventilated space.
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from article Ephemeroptera
Ephemeroptera. (a) Mayfly, adult male, Hexagenia sp., in usual resting position (after A. H. Morgan, Field Book of Ponds and Streams, G. Putnam's Sons, 1930). (b) Mayfly, subadult male, Callibaetis sp., newly emerged from water, standing on surface…
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from article Prairie dog
Black-tailed prairie dogs (Cynomys ludovicianus). (Photo by Ron Singer, U.S. Fish and Wildlife Service)
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from article Hydraulic actuator
Function of a hydraulic double-acting cylinder.
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from article Hydraulic actuator
Types of hydraulic cylinder (linear) actuators. (a) Single-acting, external return. (b) Single-acting, spring return. (c) Telescopic. (d) Double-acting double-ended rod. (e) Tandem cylinders.
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from article Hydraulic actuator
Piston-rack type rotary actuator.
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from article Hydraulic actuator
Single-vane rotary actuator.
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from article Hydraulic actuator
Gear motor rotary actuator.
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from article Hydraulic actuator
Vane motor rotary actuator.
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from article Percopsiformes
Trout-perch (Percopsis omiscomaycus). (Photo by Konrad P. Schmidt)
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from article Percopsiformes
Pirate perch (Aphredoderus sayanus). (Photo by Konrad P. Schmidt)
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from article Percopsiformes
Ozark cavefish (Amblyopsis rosae). (Photo courtesy of U.S. Fish and Wildlife Service)
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from article Prosobranchia
Common gastropods. (Top left) Murex troscheli. (Middle) Conus gloriamaris. (Top right) Lambis crocata. (Bottom) Angaria vicdani.
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from article Nuclear power
Aerial view of a nuclear power plant with one cooling tower (at right). The containment structure housing the nuclear reactor and its fissile uranium fuel is the gray, domed structure rising above the rest of the support buildings at center.…
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from article Nuclear power
Advanced boiling-water reactor (ABWR), the first advanced light-water reactor to be deployed commercially. (Credit: General Electric)
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from article Nuclear power
Aerial image of the stricken Fukushima Daiichi nuclear power plant, showing damaged reactor buildings. (Credit: Department of Energy Aerial Measuring System)
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from article Sauropterygia
Ceresiosaurus calcagnii, ventral view.
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from article Alcohol
Ethanol production plant. (Credit: Julie Kendall/Getty Images)
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from article Alcohol
E85 is a gasoline-ethanol blend containing 51 to 83% ethanol. It is used in flexible-fuel vehicles, which can operate on gasoline or blends of gasoline and ethanol. About 20 million flexible-fuel vehicles are operating in the United States. (Credit:…
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from article Gate circuit
Switch circuit architecture. (a) CMOS transmission gate, with an NMOS and a PMOS transistor in parallel, clocked at opposite clock signals (C and ). (b) Switch circuit for two-input logic AND function, with two normally-OFF switches in series and…
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from article Gate circuit
Logic symbols and corresponding gate circuits. (a) CMOS inverter circuit built with a PMOS and an NMOS transistor. (b) Two-input NAND circuit.
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from article Gate circuit
Emitter-coupled logic (ECL) two-input OR/NOR circuit, consisting of a differential pair.
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from article Zebu
Gray Brahman bull (Bos indicus). (Photo courtesy of Salinas Ranch, Carmine, Texas)
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from article Desertification
Overgrazing on North American rangelands contributes to soil compaction and alters the composition of vegetation. (Credit: Thomas Wikle)
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from article Desertification
Desertification can be accelerated by cultivation in areas better suited for herding, such as this field in Ethiopia. (Credit: Thomas Wikle)
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from article Desertification
Grazing animals have contributed to desertification in Africa’s Sahel region. (Credit: Thomas Wikle)
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from article Engine lubrication
Pressurized lubricating system for an automobile engine. Arrows show the flow of oil through the engine. (Toyota Motor Sales U.S.A. Inc.)
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from article Commutation
Basic commutator for a dc motor.
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from article Commutation
Three-phase converter.
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from article Ship salvage
USNS Safeguard (T-ARS 50). (U.S. Navy)
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from article Ship salvage
Beach-gear deployment. Beach gear enables a stranded ship to assist in pulling itself into deep water. 1 fathom = 1.8 m; 8000 lb = 3600 kg; 30 ft = 9 m; 1–5/8 in. = 41 mm; 5/8 in. = 16 mm.
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from article Ship salvage
Parbuckling technique, used to right a ship that is on its side or capsized. Wires are passed from the uppermost deck edge, around under the hull, and to a source of lift. Tensioning the wires rolls the ship upright, and it can then be raised by…
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from article Ship salvage
Lift craft operation. (a) At low tide, the lift craft are ballasted down, and cables are passed beneath the sunken vessel and pulled tight. (b) At high tide, the lift craft are deballasted, and the sunken vessel is raised above the ocean bottom and…
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from article Gas tube
Symbol for a gas-filled diode.
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from article Photonic integrated circuits
Schematic cross section of the basic building blocks for InP-based PICs. SOA = semiconductor optical amplifier. (From M. Smit et al., 2014, published under a Creative Commons BY 3.0 license)
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from article Photonic integrated circuits
InP-based multiproject wafer (MPW) incorporating multiple PIC designs. (From M. Smit et al., 2014, published under a Creative Commons BY 3.0 license)
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from article Photonic integrated circuits
Cross-sectional view of a silicon-on-insulator (SOI) waveguide.
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from article Photonic integrated circuits
Building blocks of silicon photonics–based PICs. (Credit: Phil Saunders)
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from article Photonic integrated circuits
Silicon photonics–based PIC with heterogeneously integrated GaSb photodiodes for spectroscopic glucose sensing. (Credit: imec, Belgium)
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from article Model theory
Conceptual model of a system.
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from article Model theory
Model of a regional population system.
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from article Laminariales
Laminaria: (a) sporophyte; (b) cross section of blade, showing a sorus of unilocular sporangia interspersed with sterile hairs (paraphyses); (c) zoospore; (d) male gametophyte with antheridia; (e) antherozoid (sperm); (f) female gametophyte with…
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from article Laminariales
Giant kelp (Macrocystis pyrifera) can grow up to 0.6 m (2 ft) per day. Note the series of frond blades, with each subtended by a bladder. (Photo courtesy of Charlotte Stevenson, University of Southern California Sea Grant, Los Angeles)
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from article Geochemical prospecting
Recognition of regional and local anomaly thresholds is the basis for geochemical exploration. (From A. W. Rose et al., Geochemistry in Mineral Exploration, 2d ed., Academic Press, London, 1979)
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from article Geochemical prospecting
Gold, lead, copper, and molybdenum with respect to a GIS for the northern Nevada rhomboid. GIS provides topography, geology, and geophysical background for the metal occurrences. The rhomboid is shown in all frames. Boundaries in the top panel are…
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from article Scheduling
Gantt chart user interface of a scheduling system.
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from article Diadematoida
Two ambulacral plates of Diadema. (After T. Mortensen, A Monograph of the Echinoidea, III, C. A. Reitzel, Copenhagen, 1943)
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from article Diadematoida
Diadema antillarum on coral reef. Spines are commonly black, but white spines, as shown here, are also frequently found. (Photo courtesy of J. E. Miller)
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from article Ring
Stresses in rings. (a) Entire ring, showing relation of quadrant AB and angle θ to load P and radius R. (b) Stresses on quadrant AB. (c) Variation of moment with angle θ. (d) Stresses on arbitrary section.
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from article Valvatida
Valvatid pedicellariae (valvate type) on marginal plates of Hippasteria trojana.
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from article Valvatida
Three-dimensional diagram showing the main ossicles of the valvatid arm.
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from article Movable bridge
Steamboat Slough Bridge, California. (Courtesy of California Department of Transportation)
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from article Movable bridge
Sacramento Tower Bridge, California. (Courtesy of California Department of Transportation)
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from article Movable bridge
Exposed gear reductions on an early bascule bridge.
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from article Movable bridge
Enclosed gear reducers on a later bascule bridge. (Courtesy of Earle Gear and Machine Co.)
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from article Electret
Schematic cross sections of electrets. (a) Solid electret disk metallized on one side with real charges (surface and space charges) and dipolar charges. (b) Cellular electret metallized on both sides with charges of opposite polarities on the upper…
