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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.
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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 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 Salmon farming
Adult Atlantic salmon (Salmo salar). (Credit: William Hartley/U.S. Fish and Wildlife Service)
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from article Salmon farming
Atlantic salmon (Salmo salar) at a pre-smolt stage. (Credit: Edward Peter Steenstra/U.S. Fish and Wildlife Service)
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from article Salmon farming
A congregation of coho salmon (Oncorhynchus kisutch) released from a hatchery. Investigators continue to study the effects of farmed fish on neighboring populations of wild salmonids. (Credit: Salmon Ecology Team/Southwest Fisheries Science Center,…
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from article Impedance matching
L-section impedance matching network.
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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.
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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.
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from article Electrical impedance
An illustration of a generalized alternating-current circuit.
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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)
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from article Schuler pendulum
Basic principles illustrated by (a) simple pendulum; (b) Earth-radius pendulum; (c) solid pendulous rod.
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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.
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from article Schuler pendulum
Gyropendulum; thrust bearing provides extra freedom, necessary for gyroscopic action.
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from article Schuler pendulum
Principle of Schuler-tuned stable platform.
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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).
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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)
Image
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)
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from article Spacecraft structure
Radio Astronomy Explorer spacecraft with antennas extended in comparison to the Empire State Building in New York City.
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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)
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from article Spacecraft structure
Comparison of various space reentry and ballistic missile trajectories.
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from article Spacecraft structure
Mars Pathfinder entry, descent, and landing. (NASA/Jet Propulsion Laboratory)
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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)
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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)
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from article Airplane
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from article Airplane
Effect of streamlining. (a) Body without streamlining. (b) Body with streamlining, minimizing the region of separation.
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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.
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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…
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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.
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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 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 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 Prehistoric technology
Elements of stone flaking. (a) Relationship between the core and the flake. (b) Major feature of the ventral or release surface of the flake. (After I. Tattersall, E. Delson, and J. A. Van Couvering, eds., Encyclopedia of Human Evolution and…
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from article Prehistoric technology
Principal techniques of stone-tool manufacture. (a) Hard-hammer, with free-hand percussion. (b) Anvil technique. (c) Bipolar technique. (d) Soft-hammer percussion. (e) Indirect percussion or punch technique. (f) Pressure flaking. (After…
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from article Prehistoric technology
Potters from the village of Harappa, Pakistan, display their wares in front of a replica of a two-chambered kiln used by ancient potters in the Indus Valley civilization. (Photo courtesy of R. P. Wright)
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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.
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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
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from article Petrochemical
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from article Petrochemical
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from article Petrochemical
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from article Petrochemical
Chemicals from cycloaliphatic compounds and from aromatic compounds.
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from article Petrochemical
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from article Petrochemical
Chemicals from synthesis gas. (After J. G. Speight, The Chemistry and Technology of Petroleum, 3d ed., p. 852, Marcel Dekker, New York, 1999)
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from article Air navigation
Typical wind triangle, drawn to scale. 1 knot = 1 nmi/h = 0.514 m/s.
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from article Air navigation
Electronic map display developed by a flight management computer on the pilot's instrument panel of a Boeing 767 airplane. (United Airlines)
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from article Air navigation
Loran C chain GRI 7980 in the southeastern United States, comprising primary station M and secondary stations W, X, Y, and Z. A position fix is shown at point A, where the lines of position 7980-Y-45000 and 7980-Z-61000 intersect.
Image
from article Flame
Structure of a premixed laminar flame front.
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from article Flame
Structure of a laminar diffusion flame front.
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from article Information management
Information concept in a word tag cloud managed in the context of big data. (Credit: Shutterstock/Rafal Olechowski)
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from article Videotelephony
Video telephone call using a tablet computer. (Courtesy of Fotolia, https://us.fotolia.com)
Image
from article Dawn mission
An artist's impression of the Dawn spacecraft in orbit around Vesta. (Credit: NASA/JPL)
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from article Dawn mission
The interplanetary trajectory of the Dawn spacecraft. (Credit: NASA)
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from article Dawn mission
A natural color image of Vesta taken by the Dawn spacecraft. (Credit: NASA / JPL / MPS / DLR / IDA / Björn Jónsson)
Image
from article Dawn mission
A natural color image of Ceres captured by Dawn, showing some bright salty deposits on the dwarf planet's cratered surface. (Credit: NASA / JPL-Caltech / UCLA / MPS / DLR / IDA / Justin Cowart)
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from article Dawn mission
Vesta topography shown as color-contoured Mollweide projection. Topography in kilometers (scale bar at bottom) is calculated relative to a reference ellipsoid of 285 × 285 × 229 km (177 × 177 × 142 mi). (Credit: F. Preusker, German Aerospace Center)
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from article Dawn mission
Distribution of hydrogen (H) on the Vestan surface, seen by the gamma ray and neutron detector (GRaND) instrument. (Credit: T. Prettyman, Planetary Science Institute)
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from article Dawn mission
Distribution of hydrogen (H) on the Cerian surface, seen by the gamma ray and neutron detector (GRaND) instrument. (Credit: NASA/JPL-Caltech/UCLA/ASI/INAF)
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from article Pictorial drawing
Perspective drawing of a residence. (Home Planners Inc.)
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from article Pictorial drawing
Isometric drawing; measurements along each axis are made with the same scale.
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from article Pictorial drawing
Oblique pictorial drawing.
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from article Pictorial drawing
Exploded-view production illustration; this drawing is isometric.
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from article Mechanical vibration
Vibrating linear system (mass-spring-damper) with one degree of freedom.
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from article Mechanical vibration
Variation of amplitude of vibration with forcing frequency and damping. X max = maximum displacement.
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from article Mechanical vibration
Impedance of a simple oscillator.
