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from article Eclipse
The August 21, 2017 total solar eclipse, as seen from Hopkinsville, Kentucky, USA at 2:25 p.m. EDT. (Credit: NASA)
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Image
from article Eclipse
Circumstances of solar and lunar eclipses (not to scale).
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from article Eclipse
Diamond-ring effect at the beginning of totality during the solar eclipse of July 11, 2010, observed from Easter Island in the middle of the Pacific Ocean. (Credit: Jay M. Pasachoff/Science Faction, Muzhou Lu, and Craig Malamut, Williams College…
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from article Eclipse
Total solar eclipse of July 11, 2010, observed from Easter Island in the Pacific Ocean. (a) Image composited from several exposures using radial filters in order to show a wide dynamic range of intensity of the corona and to bring out the structures…
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from article Eclipse
Solar eclipse of April 8, 2005, observed during totality from a ship in the mid-Pacific Ocean, west of the Galápagos Islands. (Credit: Jay M. Pasachoff and Dava Sobel/Science Faction)
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from article Eclipse
Paths of all total solar eclipses from 2001 through 2025. The point of greatest eclipse is indicated by an asterisk on each eclipse path. (Credit: Eclipse map by Michael Zeiler, www.eclipse-maps.com. Eclipse paths by Xavier Jubier, xjubier.free.fr.)
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from article Eclipse
Cross section through the Earth's shadow cone (umbra) at the Moon's distance, showing the motion of the Moon at three types of lunar eclipses: penumbral eclipse, partial umbral eclipse, and total umbral eclipse.
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from article Eclipse
Stages of the total lunar eclipse of December 21, 2010. (Credit: Glenn Schneider)
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from article Eclipse
Total lunar eclipse of December 9, 1992, which was so dark that it rendered the Moon nearly invisible during totality. (Credit: F. Espenak)
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from article Pituitary gland disorders
Anatomy of the human pituitary gland, which is attached to the base of the brain. (Copyright © McGraw Hill)
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from article Pituitary gland disorders
Infarction (obstruction of the blood supply) of the pituitary gland. This pituitary gland is almost entirely infarcted. Only a thin rim of viable cells remains (arrow). Pituitary infarcts can occur during pregnancy (Sheehan's disease) or as a result…
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from article Strychnos
Strychnos nux-vomica: close-up view of leaves and flowering branch. (Photo courtesy of Dinesh Valke)
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from article Clathrate compounds
Schematic drawing of the lattices of (a, c) urea and (b, d) thiourea; c and d show accommodation of unbranched and branched paraffin chains, respectively.
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from article Clathrate compounds
Molecular model of α-dextrin–iodine compound seen in the direction of the c axis, that is, in the direction of the iodine chains, which lie in channels.
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from article Space flight
Earthrise, with the surface of the Moon in the foreground, photographed by astronauts aboard the Apollo 8 mission in late 1968. Apollo 8 was the first crewed mission to the Moon. (Credit: NASA)
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from article Space flight
Soyuz, a third-generation Soviet spacecraft. 1 m = 3.3 ft.
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from article Space flight
Comparison of U.S. spacecraft and launch vehicle configurations through 1972. (Credit: NASA)
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from article Space flight
The Apollo 11 lunar module on the surface of the Moon in July 1969. (Credit: NASA)
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from article Space flight
Skylab in orbit around Earth. (Credit: NASA)
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from article Space flight
The space shuttle Discovery launching in July 2006. (Credit: NASA)
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from article Space flight
Shuttle Atlantis returning home to Kennedy Space Center after its final mission, July 21, 2011. (Credit: NASA)
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from article Space flight
The completed International Space Station in orbit around Earth. (Credit: NASA)
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from article Space flight
Artist's impression of the Space Launch System with the Orion spacecraft on top. (Credit: NASA)
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from article Wire drawing
Wire being drawn through a die.
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from article Wire drawing
Comparison of (a) ideal and (b) redundant deformation.
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from article Wire drawing
Variation of the work terms with die angle according to Eqs. (1), (3), (4), and (6), with ε = 0.3 and η = 0.08.
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from article Wire drawing
Dependence of the efficiency on die angle for several reductions. A friction coefficient of μ = 0.08 was assumed.
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from article Wire drawing
Comparison of the predictions of I.F. from Eq. (12) with experiments on copper.
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from article Wire drawing
Microstructure of a tungsten wire cold-drawn to an 87% reduction of area, viewed along the wire axis.
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from article Metal rolling
Rolling process. (a) Direction of friction forces in the roll gap. (b) Velocity distribution. (c) Normal pressure acting on the strip in the roll gap.
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from article Metal rolling
Basic types of roll arrangement. (a) Two-high. (b) Three-high. (c) Four-high. (d) Cluster. (e) Tandem rolling with three stands. (f) Planetary mill.
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from article Metal rolling
Development of the Mannesmann process for producing seamless tubing (a–c explained in text).
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from article Guided missile
A U.S. Navy ship fires a Tomahawk cruise missile at a target in Libya as part of Operation Odyssey Dawn in 2011. (Credit: MC3 Jonathan Sunderman/US Navy/DoD)
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from article Guided missile
A V-2 rocket constructed by the U.S. military lifts off in this historical photo. Production and development of V-2 rockets continued in the United States after the defection of German aerospace engineers during World War II. (Credit: U.S. Army)
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from article Planet
An artist’s impression of a mere sampling of the planetary diversity expected to exist in nature. [Credit: C. Pulliam & D. Aguilar (CfA)]
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from article Planet
Plan of the solar system's major and dwarf planets. (a) Solar system out to Neptune. (b) Dwarf planets in the outer solar system (Credit: Emily L. Schaller)
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from article Planet
Orbital elements, which determine the position of a planet in its orbit and the orientation of the orbit in space. Symbols explained in text.
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from article Planet
The interiors of the 8 planets and the dwarf planet Pluto. Mercury, Venus, Earth, and Mars are characterized by dense, metallic cores and lower-density mantles and crusts. Jupiter and Saturn have compositions that mimic the Sun's, though…
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from article Planet
Complex lunar crater Bullialdus, 60 km (37 mi) in diameter, shows terraced sides, a central peak, and a flat bottom. It may be compared to the small (less than 8 km or 5 mi) crater in the foreground, which is simple and bowl-shaped. (Credit: NASA)
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from article Planet
Ultraviolet images from the Hubble Space Telescope, which reveal auroral emission surrounding the north magnetic pole of Jupiter. [Credit: NASA, ESA, and J. Nichols (University of Leicester)]
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from article Root (botany)
Kinds of roots. (a) Adventitious, on a cutting or slip (geranium). (b) Prop and other adventitious (corn). (c) Fibrous adventitious (grass). (d) Primary, or taproot (dandelion). (e) Fleshy taproot (carrot). (f) Fleshy, fascicled adventitious…
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from article Root (botany)
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from article Root (botany)
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from article Root (botany)
Distribution of tissues in a typical root apex.
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from article Root (botany)
Transverse sections of roots, showing primary and secondary tissues. (a) Soybean. (b) Barley. (c) Soybean; enlarged part of a, showing early formation of cambium. (d) Soybean with abundant secondary tissue.
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from article Root (botany)
Diagrams of vascular transition in dicotyledonous seedling (beet, Beta vulgaris) from root tip upward to level of cotyledons. (a) Root is diarch; its vascular tissues are continuous with those of (e) the cotyledons through (b–d) the transition…
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from article Atomic bomb
The mushroom cloud over Nagasaki, Japan, after an atomic bomb was dropped by U.S. aircraft on August 9, 1945. (Credit: Everett Historical/Shutterstock)
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from article Atomic bomb
Conceptual diagrams illustrating the main features of (a) implosion type and (b) gun-barrel type of fission weapons. (Credit: A. DeVolpi)
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from article Gain
Gain by an amplifier or other system.
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from article Gain
Bode diagrams. (a) Gain plot. (b) Phase plot.
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from article Robotics
A dexterous humanoid robot (robonaut) built at the NASA Johnson Space Center in Houston, Texas, USA to work alongside humans in space. (Credit: NASA)
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from article Robotics
A model for the selective compliance assembly robot arm (SCARA). It has 3 links. Horizontal links move sideways and the third (vertical) link moves up and down. It shown here with a drill, a chuck, and drill bit. (Credit: Richard Pasala)
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from article Robotics
The right hand of a NASA robot grasping a hook. The robot's hands closely mimics the human hand in order to use tools and handholds designed for astronauts. (Source: NASA)
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from article Robotics
Six-legged walking robot. (Odetics)
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from article Optical flat
Optical flat being used to determine flatness of seal ring. Interference bands on the seal ring face show lines of constant depth. (Van Keuren Co.)
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from article Optical flat
Measurement of height of sphere determined by means of gage blocks and optical flat. 1″ = 25.4 mm.
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from article Wilkinson Microwave Anisotropy Probe
Wilkinson Microwave Anisotropy Probe (WMAP) spacecraft. (Courtesy of NASA/WMAP Science Team)
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from article Wilkinson Microwave Anisotropy Probe
WMAP sky-scan strategy. (a) Location of the satellite relative to the Earth and Sun (not to scale), and the orientation of the satellite and of the lines of sight to the spots on the sky focused by the primary reflectors, which continually changed…
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from article Wilkinson Microwave Anisotropy Probe
WMAP full-sky CMB anisotropy map. The microwaves captured in this picture from WMAP are from when the universe was 378,000 years old, over 13 × 109 years ago. It is a “baby picture” of the universe, equivalent to taking a picture of an 80-year-old…
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from article Composite material
NASA technicians inspecting the keel section of a PRSEUS (Pultruded Rod Stitched Efficient Unitized Structure). This is a new way for aircraft sections to be built by sewing together layers and rods of composite material. (Credit: NASA…
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from article Composite material
Specific properties of various materials.
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from article Composite material
Tensile strength, modulus, and elasticity of various fiber materials. UHMWPE = ultrahigh-molecular-weight polyethylene; SiC = silicon carbide.
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from article Composite material
Typical autoclave layup.
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from article Composite material
Typical layups for (a) resin transfer molding (RTM) and (b) vacuum infusion (VI).
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from article Folic acid
Chemical structure of folic acid (C19H19N7O6). (Copyright © McGraw Hill)
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from article Digenea
Diagrams of various adult types of digenean trematodes. (After R. M. Cable, An Illustrated Laboratory Manual of Parasitology, Burgess, Minneapolis, 1940)
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from article Digenea
Digenean trematode life cycle. (After R. M. Cable, An Illustrated Laboratory Manual of Parasitology, Burgess, Minneapolis, 1940)
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from article Hydroponics
Green- and red-leaf lettuce growing in a hydroponic vegetable garden on a bamboo fence. The pipes, which supply nutrients and water, are part of the hydroponic system. (Credit: Piyachok Thawornmat, Shutterstock)
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from article Hydroponics
Hydroponic techniques: (a) aerated standing culture; (b) flowing-solution culture with standing solution; (c) nutrient film technique; (d) aeroponics.
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from article Uninterruptible power supply
Block diagram of a line-preferred UPS (off-line technology).
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from article Uninterruptible power supply
Block diagram of an on-line UPS with bypass switch.
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from article Uninterruptible power supply
Block diagram of the flywheel rotary UPS topology.
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from article Uninterruptible power supply
Block diagram of diesel rotary UPS topology.
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from article Uninterruptible power supply
Block diagram of the online distributed configuration.
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from article Uninterruptible power supply
Block diagram of line-interactive distributed application.
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from article Uninterruptible power supply
Block diagram of the centralized approach.
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from article Flower
Flower structure, median longitudinal section.
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from article Flower
Diagrammatic section of an orange blossom. (After J. B. Free, Insect Pollination of Crops, Academic Press, 1970)
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from article Flower
Flower of Penstemon, a member of the foxglove family, in section. (After C. E. Wood, Jr., A Student's Atlas of Flowering Plants: Some Dicotyledons of Eastern North America, Harper and Row, 1974)
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from article Flower
Longitudinal section of a flower bud and one carpel in section of blackberry (Rubus betulifolius). (After K. R. Robertson, The genera of Rosaceae in the southeastern United States, J. Arnold Arbor., 55:344–401, 1974)
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from article Flower
Placentation: (a) parietal, (b) axile, and (c) free central. (After P. H. Raven, R. F. Evert, and H. Curtis, Biology of Plants, Worth Publishers, 1976)
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from article Flower
Nectaries. (a) Cherry flower (after W. H. Brown, The bearing of nectaries on the phylogeny of flowering plants, Proc. Amer. Phil. Soc., 79:549–595, 1938). (b) Flower of nasturtium (after B. J. D. Meeuse, The Story of Pollination, Ronald Press,…
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from article Flower
Sunflower (Helianthus annuus) of the composite family. (a) Inflorescence in section. (b) Side view of ray floret. (c) Side view of tubular floret. (d) Section of tubular floret. (After J. B. Free, Insect Pollination of Crops, Academic Press, 1970)
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from article Flower
Successive stages of flower formation in a wood sorrel. (a) Sepals and petals already initiated; the androecium begins as five bumps on the floral apex; five more will be added. At maturity, five long stamens will alternate with five short ones. (b)…
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from article Flower
Lily anther. (a) Cross section of young anther showing four microsporangia with sporogenous tissue. (b) Cross section of mature anther with two pollen sacs containing pollen. (After A. W. Haupt, Plant Morphology, McGraw-Hill, 1953)
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from article Flower
Gametophyte: (a) embryo sac and (b) pollen tube. (After O. Tippo and W. L. Stern, Humanistic Botany, W. W. Norton, 1977)
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from article Tomato
Tomatoes (Solanum lycopersicum). (Credit: Peggy Greb, Agricultural Research Service, U.S. Department of Agriculture)
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from article Tomato
Tomato affected by anthracnose (caused by the fungus Colletotrichum phomoides). (Credit: U.S. Department of Agriculture Cooperative Extension Slide Series, Clemson University)
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from article Tomato
Tomatoes showing blossom-end rot. (Credit: Mary Ann Hansen, Virginia Polytechnic Institute and State University)
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from article Ohmmeter
Electronic digital ohmmeter. (Tinsley)
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from article Ohmmeter
Diagram of ohmmeter, showing operating principles. C1, C2 = current terminals; P1, P2 = potential terminals.
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from article Ohmmeter
Special measuring probes (Kelvin clips), consisting of a set of leads with combined current probes (C1, C2) and potential probes (P1, P2).
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from article Electrolysis
Electrolysis cell in which the electrolyte is a solution of sodium chloride.
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from article Mixing
Typical impeller-type liquid mixer. (After V. W. Uhl and J. B. Gray, Mixing: Theory and Practice, vol. 2, Academic Press, 1967)
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from article Mixing
Effect of impeller size and speed on flow and turbulence (shear) at constant power.
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from article Mixing
Common impellers. (a) Marine-type mixing propeller. (b) Axial-flow (pitched-blade) turbine. (c) Flat-blade (Rushton) turbine. (After R. H. Perry and C. H. Chilton, eds., Chemical Engineers' Handbook, 5th ed., McGraw-Hill, 1973)
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from article Mixing
Swirling flow pattern for impeller of any shape, without baffles. (a) Side view. (b) Bottom view.
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from article Mixing
Flow patterns with baffles. (a) Flow pattern for propeller with baffles at tank wall. (b) Flow pattern for turbine with baffles at tank wall.
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from article Mixing
Flow pattern for top-entering, off-center propeller without baffles: (a) front, (b) top, and (c) side views.
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from article Mixing
Side-entering propeller mixer position. With proper propeller position, no vortex will result.
