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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 Molybdenum
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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 Nuclear molecule
Similarity between (a) a chemical (atomic) molecule and (b) a nuclear molecule. EROT = rotational energy; EVIB = vibrational energy; Ee = electronic energy; En = nuclear energy. (From R. R. Betts and A. H. Wuosmaa, 1997)
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from article Nuclear molecule
Differential cross sections for elastic scattering of 12C on 12C and 16O on 16O for the center-of-mass scattering angle θcm = 90° as functions of the incident center-of-mass energy, Ecm. 1 barn (b) = 10−28 m2; sr = steradian. (From R. R. Betts and…
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from article Nuclear molecule
Differential cross section for elastic scattering of 16O on 16O for the center-of-mass scattering angle θcm = 90° as a function of the incident center-of-mass energy, Ecm. The dots are experimental points, the thin solid curve is the result of a…
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from article Nuclear molecule
The real potential for the elastic scattering of 16O on 16O for different values of the quantum number of angular momentum of relative motion, l. Examples of quasibound and virtual states are shown. The variable r is the distance between the centers…
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from article Nuclear molecule
Molecular window for magnesium-24 (24Mg), depicted as a function of the square of the quantum number of total angular momentum, I, and the excitation energy of 24Mg [Eexc(24Mg)]. In the molecular window, the absorption from the elastic channels into…
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from article Nuclear molecule
Double-resonance effect. In the scattering of 16O on 16O an elastic entrance partial wave can resonate at the center-of-mass energy Ecm = Ei ≈ 20.8 MeV with an l = 12 virtual (v.) state inside its width (∼2 MeV). Then it inelastically excites the 3−…
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from article Nuclear molecule
Potential energy of the dinuclear system in the reaction 54Cr + 208Pb → 262Sg as a function of the mass-fragmentation coordinate, η (initial value of |η|, |ηi| = 0.59) for total angular momentum J = 0. The dotted curve is calculated for spherical…
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from article Nuclear molecule
Calculated capture, fusion, and xn-evaporation residue cross sections (x = 1, 2, 3, 4), the fusion probability PCN, and the ratio between the neutron and fission widths Γn/Γf for the reaction 48Ca + 248Cm leading to the element livermorium (Lv, Z =…
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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 Staining
Photomicrograph of Mycobacterium tuberculosis (the causative agent of tuberculosis) using the acid-fast Ziehl-Neelsen carbol fuchsin stain. In this case, the M. tuberculosis bacteria stain red (or reddish purple), whereas non-acid-fast species stain…
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from article Staining
Staining of Klebsiella bacteria using crystal violet. (Credit: Lisa Burgess/McGraw-Hill Education)
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from article Staining
Photomicrograph of a Gram-stained urethral exudate sample from a male who presented with a case of urethritis. Numerous extracellular Gram-negative Neisseria gonorrhoeae bacteria are evident. (Credit: Norman Jacobs/U.S. Centers for Disease Control…
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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 Sulfur
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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 Telemetering
Functions of a generic aerospace telemetry system.
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from article Telemetering
Functions of a supervisory control and data acquisition (SCADA) system.
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from article Telemetering
Functions of a spacecraft telemetry and command system, using packet telemetry.
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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 Time constant
Universal time-constant curve indicated (a) for the decreasing function and (b) for the increasing function.
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from article Magnetohydrodynamics
Periodic transverse displacement of a uniform magnetic field B0 and a uniform, frozen-in plasma.
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from article Magnetohydrodynamics
Evolution of a large-amplitude wave. (a) Steepening of wave. (b) Formation of shock wave.
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from article Magnetohydrodynamics
Perfectly conducting fluid in toroidal axisymmetric equilibrium.
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from article Magnetohydrodynamics
Instabilities of a Z-pinch configuration. (a) Initial configuration of magnetically confined plasma. (b) Sausage instability. (c) Kink instability.
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from article Magnetohydrodynamics
Rayleigh-Taylor instability, involving a perturbation in the interface between a light fluid and a heavy fluid above it.
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from article Magnetohydrodynamics
Two flux tubes in a magnetic field configuration.
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from article Magnetohydrodynamics
Effect of nonvanishing resistivity on plasma stability. (a) Location of resonant surface k · B = 0. (b) Breaking and reconnection of magnetic field lines about the resonant surface in a resistive plasma.
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from article Magnetohydrodynamics
Projection of a guiding center orbit onto a poloidal plane of a tokamak.
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from article Magnetohydrodynamics
Axisymmetric, two-dimensional, liquid-metal system in which only an azimuthal current and poloidal magnetic field components exist.
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from article Magnetohydrodynamics
Plot of electron temperature Te and density ne in a plasma, showing values of these parameters where various types of behavior occur.
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from article Magnetohydrodynamics
Particles orbits in the plane perpendicular to a magnetic field Bz in a frame of reference in which the mean guiding center motion is zero.
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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 HERA electron-proton collider
Fig 1. Aerial view of the DESY site with the 6.3-km HERA underground ring indicated. (Credit: DESY)
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from article Catalysis and catalysts
The Hoveyda-Grubbs catalyst, molecular formula C31H38Cl2N2ORu, is a ruthenium-based metathesis catalyst.
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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)
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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)
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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.
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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 Nuclear isomerism
Decays of isomers in (a) 77Kr and (b) 77Zn, showing the effects of energy and change of spin/parity on the lifetimes of the states. Numbers and “+” or “−” signs to the left of levels give their spins and parities, and numbers to the right of levels…
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from article Nuclear isomerism
Decays of shape isomers in (a) 74Kr and (b) 238U. Labeling of levels and gamma transitions is the same as in Fig. 1.
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from article Nuclear isomerism
Decay of the spin-gap 95mPd isomer. Labeling of levels and of the gamma transition from the isomeric (21/2+) level is the same as in Fig. 1.
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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 Superacid
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from article Superacid
Hammett acidity function (H0) values for some solutions in 100% H2SO4. (After E. F. Caldin and V. Gold, eds., Proton Transfer Reactions, Chapman and Hall, 1975)
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from article Superacid
Hammett acidity function (H0) values for acids of the fluorosulfuric acid solvent system. (After E. F. Caldin and V. Gold, eds., Proton Transfer Reactions, Chapman and Hall, 1975)
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from article Superacid
Hammett acidity function (H0) values for some HF−MF5 systems.
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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 Boiling
Typical boiling curve, showing qualitatively the dependence of the wall heat flux q on the wall superheat ΔT, defined as the difference between the wall temperature and the saturation temperature of the liquid. Schematic drawings show the boiling…
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from article Boiling
Effect of external forced flow, at low and high velocity, on the boiling heat curve. The maximum heat flux is increased and the natural convection curve is shifted up due to forced convection. Locations of points A and C in Fig. 1 are indicated.
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from article Spin-density wave
Types of spin-density wave observed in metals: SS = spiral (helical); FS = ferromagnetic (cone); = skewed; LSW = longitudinal; TSW = transverse; FAN = stable only in a magnetic field B in the direction shown.
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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 Colloid
Examples of colloid particles. (a) Zinc sulfide (sphalerite). (b) Cadmium carbonate, with an enlargement of the boxed section (courtesy of Egon Matijević).
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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 Pitot tube
Pitot tubes. (a) Original form. Symbols explained in text. (b) Modern shielded Kiel probe.
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from article Electric distribution systems
Overview of the power system from generation to consumer's switch.
