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from article Wool
Sheep at a research facility near Dubois, Idaho. (Photo courtesy of the Agricultural Research Service, U.S. Department of Agriculture)
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Image
from article Wool
Longitudinal section of a completely developed nonmedullated wool follicle, including sebaceous and sweat glands.
Image
from article Wool
Cuticle, cortex, and medulla of a wool fiber.
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from article Wool
Scale formation of Delaine Merino wool fibers.
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from article Wool
Fine wool staples showing distinct crimp (wavy) patterns. The length shown is the minimum for each classification.
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from article Stainless steel
Passivity phenomenon in stainless steel.
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from article Stainless steel
Graph of the effect of cold-work on tensile strength of stainless steels. 1000 psi = 6.9 MPa.
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from article Stainless steel
Three corrosion effects on stainless steel. (a) Sensitization. (b) Stress-corrosion cracking. (c) Pitting corrosion.
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from article Concrete
Workers placing and vibrating concrete on a bridge deck including epoxy-coated reinforcing steel. (Portland Cement Association)
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from article Concrete
Concrete slump test with a slump of 1.5 in., typical for pavement work. (Portland Cement Association)
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from article Concrete
Glass concrete tile. (C. Meyer)
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from article Steam-generating furnace
Water-cooled furnace-wall constructions. (a) Tangent tube. (b) Welded membrane and tube. (c) Flat stud and tube. (d) Full stud and refractory-covered tube. (e) Tube and tile. (f) Tubes backed by refractory. (After T. Baumeister, ed., Marks' Standard…
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from article Cerargyrite
Cerargyrite crystals from Leadville, Colorado. (Specimen from Department of Geology, Bryn Mawr College)
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from article Castor plant
Seeds of the castor plant (Ricinus communis). These seeds, which are also known as castor beans, are processed to make castor oil. (Credit: Brian Prechtel/Agricultural Research Service, United States Department of Agriculture)
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from article Internal combustion engine
The basic mechanics of how an internal combustion engine works, showing only one cylinder. (Credit: Sarah Gerrity, U.S. Energy Department)
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from article Granulite
Southern part of peninsular India and Sri Lanka, showing broad tectonic and metamorphic features. (After A. P. Subramaniam, Charnockites and granulites of southern India: A review, Dan. Geol. Foren., 17:473–493, 1967)
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from article Impedance matching
L-section impedance matching network.
Image
from article Fluidized-bed combustion
Fluidized-bed steam generator.
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from article Fluidized-bed combustion
Flow diagram showing the operation of a multicell fluidized-bed boiler.
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from article Fluidized-bed combustion
Flow diagram of 600-MW combined-cycle system.
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from article Compressor
Compressor cylinders, (a) water-cooled and (b) air-cooled.
Image
from article Compressor
Cross section of stationary angle-type compressor with first stage vertical and second stage horizontal.
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from article Compressor
Operation of sliding-vane rotary compressor.
Image
from article Titan
Natural color view of Titan at left. The false-color view at right incorporates infrared light in place of red light, revealing surface details and clouds. Both images obtained by the Cassini orbiter. (Credit: NASA/JPL-Caltech/Space Science…
Image
from article Titan
Images of Titan taken by Cassini's visual and infrared mapping spectrometer, penetrating through the moon's hazy atmosphere. The flyby dates are as follows: October 28, 2005 (left), December 26, 2005 (middle), and January 15, 2006 (right). A notable…
Image
from article Titan
Physical structures of the atmospheres of Titan and Earth. The vertical axis is logarithmic pressure. The two atmospheres appear similar, except offset in temperature. Also marked are the corresponding altitude levels in each atmosphere, showing…
Image
from article Titan
Map of Titan, with names indicated for many major regions, compiled through mapping by Cassini as of June 2015. (Credit: NASA/JPL-Caltech/Space Science Institute/USGS)
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from article Titan
Huygens probe descent mosaic of three images, about 7 km (4.3 mi) across, showing a high ridge area and river channel flows. (Credit: ESA/NASA/JPL/University of Arizona)
Image
from article Titan
Side-looking image acquired by the Huygens probe after impact on Titan's surface, showing rounded cobbles between about 5 and 15 cm (2 and 6 in.) across. (Credit: NASA/JPL/ESA/University of Arizona)
Image
from article Titan
Synthetic aperture radar from Cassini of Ligeia Mare, the second largest body of liquid on Saturn's moon Titan. It is comparable in size to Lake Superior. The methane-dominated maria is rendered black, with Titan's surrounding land rendered yellow…
Image
from article Titan
Map of Titan's mountain chains compiled by Cassini, with officially named peaks indicated. The mountains are named after mountains appearing in the fictional works of J.R.R. Tolkien, such as The Lord of the Rings. (Credit NASA/JPL-Caltech/University…
Image
from article Melilite
Melilite crystals from Vesuvius, Italy. (Specimen from Department of Geology, Bryn Mawr College)
Image
from article Electrical impedance
An illustration of a generalized alternating-current circuit.
Image
from article Electrical impedance
Three common ac circuit arrangements. (Credit: Louis Frenzel)
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from article Electrical impedance
Standard arrangement of a parallel ac circuit. (Credit: Louis Frenzel)
Image
from article Schuler pendulum
Basic principles illustrated by (a) simple pendulum; (b) Earth-radius pendulum; (c) solid pendulous rod.
Image
from article Schuler pendulum
Behavior of pendulous rod when accelerated about Earth. (a) Short-period pendulous rod. (b) Schuler-period pendulous rod. (c) Nonpendulous rod.
Image
from article Schuler pendulum
Gyropendulum; thrust bearing provides extra freedom, necessary for gyroscopic action.
Image
from article Schuler pendulum
Principle of Schuler-tuned stable platform.
Image
from article Sun
The Sun rising over Bloomingdale, Illinois. (Credit: Jonathan Kriz/Flickr)
Image
from article Sun
An artist's impression of a young Sun-like star surrounded by a planet-forming disk of material. (Credit: NASA/JPL-Caltech)
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from article Sun
Map of the differential rotation of the Sun, determined from helioseismology. The poles rotate slowly and the equator much faster, but the center of the Sun, below the convective zone, rotates as a rigid body. (Credit: K. G. Libbrecht and M. F.…
Image
from article Sun
The diamond-ring effect surrounded along the limb of the Moon by the pinkish chromosphere and the pinkish prominences on either side, viewed at the Easter Island total solar eclipse of 2010. The inner corona is also visible outside the silhouette of…
Image
from article Sun
Photospheric granulation in white light taken with the Swedish 1-m Solar Telescope (SST), located on the island of La Palma and operated by the Institute for Solar Physics in the Spanish Observatorio del Roque de los Muchachos of the Instituto de…
Image
from article Sun
Sunspot numbers from about 1700 to early 2018. (Credit: SILSO data/image, Royal Observatory of Belgium, Brussels)
Image
from article Sun
A symmetric sunspot with its dark umbra and lighter fibrils of its penumbra, on a background of solar granulation. Bright filigree is seen threading its way through some of the dark lanes between granules. The umbra and penumbra together are about…
Image
from article Sun
Image of the Sun in hydrogen-alpha (Hα) light. As the dark filament at upper left on the disk goes over the limb, it becomes visible as a prominence seen against the sky. The Sun rotates from left to right in this picture. A sunspot is visible in…
Image
from article Sun
Large prominence in its eruptive phase after days or weeks of static inactivity, seen through a filter that passed only the 30.4-nm radiation of helium with the Atmospheric Imaging Assembly of NASA's Solar Dynamics Observatory (SDO). The horizontal…
Image
from article Sun
A solar flare is seen as a bright flash at the Sun's right in this ultraviolet image NASA's Solar Dynamics Observatory, recorded on Sept. 10, 2017. (Credit: NASA/SDO/Goddard)
Image
from article Sun
Composite image of a two-ribbon flare and a cross section of a coronal mass ejection (CME) as observed by the SOHO spacecraft (the CME image is offset from the flare image for clarity). The diagram depicts the inferred magnetic field structure…
Image
from article Sun
Total solar eclipses in the period 2010–2060, including some that are hybrid in that the beginnings and ends are annular. (Credit: Michael Zeiler, eclipse-maps.com, with eclipse paths from Xavier Jubier, [email protected])
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from article Spacecraft structure
Tropical Rainfall Measuring Mission (TRMM) spacecraft. (a) Computer-aided-design view. (b) Finite-element model (solar arrays not shown), used for structural sizing of the spacecraft (NASA/GSFC).
Image
from article Spacecraft structure
Exploded view of Delta VI M+(4,2) two-stage rocket. (Delta IV Payload Users Guide, United Launch Alliance (ULA), 2007)
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from article Spacecraft structure
Typical flight profile trajectory of the Ariane 5. SRB = solid rocket booster. (Ariane 5 User's Manual, 2008)
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from article Spacecraft structure
INTELSAT VII in its stowed and deployed configurations. (Loral, LM Astro)
Image
from article Spacecraft structure
Radio Astronomy Explorer spacecraft with antennas extended in comparison to the Empire State Building in New York City.
Image
from article Spacecraft structure
Honeycomb sandwich construction provides strong and stiff but lightweight structures. (Hexcel Corp.)
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from article Spacecraft structure
Woven Kevlar fabric is light and strong.
Image
from article Spacecraft structure
Internal telescope of the Hubble Space Telescope, whose structural members are made of graphite-epoxy. (NASA/Lockheed)
Image
from article Spacecraft structure
Comparison of various space reentry and ballistic missile trajectories.
Image
from article Spacecraft structure
Mars Pathfinder entry, descent, and landing. (NASA/Jet Propulsion Laboratory)
Image
from article Spacecraft structure
The space shuttle with cargo bay doors open. (NASA/Johnson Space Center)
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from article Spacecraft structure
ATS 7. (a) Structural assemblies. (b) Side view and (c) bottom view of deployed configuration. (d) Side view and (e) section A-A of launch configuration. (f) View of deployed spacecraft. 1 in. = 25 mm; 1 ft = 0.3 m.
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from article Spacecraft structure
The International Space Station is an example of a large structure of changing configuration that cannot be completely assembled on Earth. (NASA)
Image
from article Comfort heating
Thermograms of building structures: (a-c) masonry buildings; (d) glass-faced building. Black indicates negligible heat loss; gray, partial loss; and white, excessive loss. (Courtesy of A. P. Pontello)
Image
from article Airplane
Image
from article Airplane
Effect of streamlining. (a) Body without streamlining. (b) Body with streamlining, minimizing the region of separation.
Image
from article Airplane
Geometry of an airplane wing. Wind velocity component perpendicular to the wing span (V cos Λ, where V is the true wind velocity and Λ is the angle of sweepback) produces lift.
Image
from article Airplane
Illustration of the area rule. (a) Half-plan views of airplanes with uncompensated body and areacompensated body. (b) Cross sections of these airplanes. (c) Variation of cross-sectional areas of these airplanes with body station (longitudinal…
Image
from article Airplane
Variation of coefficient of lift with the angle of attack, showing increase up to the stall angle.
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from article Airplane
Aerodynamic control of an airplane. (a) Basic controls and control surfaces. (b) Effect of tilting the airplane in the direction of the wing lift L.
Image
from article Ball-and-race-type pulverizer
Coarse raw material is ground by crushing and attrition between balls and races and is then withdrawn from the pulverizer by an airstream.
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from article Oil sand
Tar sand deposits in Alberta. 1 mi = 1.6 km.
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from article Lightning
Charge distribution in storm clouds. (Credit: NOAA)
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from article Lightning
Natural cloud-to-ground lightning near Tucson, Arizona. Note that each discharge strikes the ground in more than one place. (Credit: Michael J. Leuthold)
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from article Lightning
Sprites, elves, and blue jets are transient luminous events in the upper atmosphere associated with thunderstorms. (Credit: NOAA)
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from article Material resource planning
Lumpy demand in manufacturing for three types of drills. The boxes represent equal time periods.
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from article Material resource planning
Flowchart for a model material resource planning system.
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from article Material resource planning
Material requirements plan mechanics and lead-time offsetting for skateboards.
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from article Stress (psychology)
Dimensions of stressful experiences. (Credit: National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health)
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from article Stress (psychology)
Diagram of the hypothalamic-pituitary-adrenal axis. The thicker arrow indicates that the feedback of glucocorticoids on ACTH is most potent. Abbreviations: ACTH, adrenocorticotropic hormone; CRH, corticotropin-releasing hormone. (Copyright ©…
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from article Detergent
Laundry detergent addition to a washing machine. (Credit: Shutterstock/TanyaRozhnovskaya)
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from article Hyperbaric oxygen chamber
Hyperbaric oxygen treatment facility.
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from article Construction engineering
Steps in resolving a construction dispute.
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from article Electric distribution systems
Overview of the power system from generation to consumer's switch.
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from article Electric distribution systems
Typical power distribution feeder.
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from article Thermistor
Bridge circuit for measuring radio-frequency power by use of a pair of thermistors.
Image
from article Devonian
Devonian, the fourth period of the Paleozoic Era.
Image
from article Devonian
Biostratigraphic zones based on conodonts (left) plotted to show approximate correspondence to the chronostratigraphic stages and series which compose the Devonian System (right) and relative sea-level changes (center) showing major fluctuations…
Image
from article Devonian
Reconstruction of Middle Devonian continental positions based on distribution of lithologic climatic indicators. Probable ocean currents derived from this paleogeography explain the biogeographic realms. Kolyma and Tarim are microcontinents of the…
Image
from article Smog
Smog, Downtown Los Angeles, California, USA. (Credit: Yenwen Lu/Getty Images)
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from article Smog
Average background concentration of ozone in the atmosphere as a function of altitude. Note the enhancement of O3 near the Earth's surface that can occur in polluted areas as a result of photochemical smog.
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from article Air conditioning
Ranges of operative temperature and relative humidity acceptable to at least 80% of sedentary persons in typical summer or winter clothing and doing light activities. In the overlap area, people with summer clothing might feel slightly cool, while…
Image
from article Air conditioning
Schematic of room air conditioner. (After American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc., Guide and Data Book, 1967)
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from article Air conditioning
Schematic of central air-handling unit.
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from article Petrochemical
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from article Petrochemical
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from article Petrochemical
Chemicals from methane.
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from article Petrochemical
Chemicals from ethylene.
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from article Petrochemical
