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from article Forest engineering

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A harvesting machine removing selected trees in a thinning operation designed to enhance the growth of the trees that remain after the operation. The “processing head” is holding a horizontal tree stem that is being delimbed and processed into logs…

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from article Forest engineering

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A well-engineered forest road and timber bridge in the Tongass National Forest in southeast Alaska. The bridge, designed to support heavy logging trucks, was used rather than a culvert to reduce erosion and protect water quality. (Photograph…

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from article Life forms of plants

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Life forms of plants according to C. Raunkiaer. (After P. Dansereau, Biogeography: An Ecological Perspective, Ronald Press, 1957)

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from article Life forms of plants

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from article Chevrotain

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Water chevrotain (Hyemoschus aquaticus). (Photo by Brent Huffman; courtesy of Ultimate Ungulate)

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from article Kiln

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Rotary kilns: (a) single-diameter; (b) two-diameter. (After R. H. Perry and C. H. Chilton, Chemical Engineers' Handbook, 5th ed., McGraw-Hill, 1973)

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from article Kiln

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Vertical shaft kiln. (After C. J. Lewis and B. B. Crocker, The lime industry's problem of airborne dust, J. APCA, 19:31–39, 1969)

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from article Kiln

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Interior of periodic kiln, with electrical porcelain insulators for firing. (Swindell-Dressler, Inc.)

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from article Kiln

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Section of direct-fired tunnel kiln showing principle of operation. (After T. J. W. van Thoor, ed., Chemical Technology: An Encyclopedic Treatment, vol. 2, Barnes and Noble, 1971)

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from article Dinosauria

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Titanosaurs (based on Rapetosaurus) in the nesting ground at Auca Mahuevo, Argentina. (Credit: Mark Hallett)

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from article Dinosauria

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Partly excavated dinosaur fossils. (Credit: Bert Beekmans/Getty Images)

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from article Dinosauria

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Simplified phylogenetic tree of the archosaurian reptiles. (Copyright © McGraw-Hill Education)

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from article Dinosauria

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Relationships of the ornithischian dinosaurs. (Credit: Modified from an original diagram by P. C. Sereno)

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from article Dinosauria

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Skull of Heterodontosaurus, showing typical ornithischian features. (Copyright © McGraw-Hill Education)

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from article Dinosauria

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A Triceratops fossil skull. (Credit: David Herraez/Alamy Stock Photo)

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from article Dinosauria

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Relationships of the saurischian dinosaurs. (Copyright © McGraw-Hill Education)

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from article Dinosauria

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Computer-generated Allosaurus dinosaur skeleton. This saurichian carnivore could attain a height of 8.5 m (28 ft). (Credit: Science Photo Library/Alamy Stock Photo)

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from article Dinosauria

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Fossilized dinosaur eggs found in Arizona. (Credit: Holly Curry; copyright © McGraw-Hill Education)

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from article Dinosauria

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Fossilized dinosaur footprints found in Arizona. (Credit: Holly Curry; copyright © McGraw-Hill Education)

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from article Crushing and pulverizing

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Blake-type jaw crusher. (Allis Chalmers Co.)

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from article Crushing and pulverizing

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Gates-type gyratory crusher. (Allis Chalmers Co.)

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from article Crushing and pulverizing

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Symons cone crusher. (Nordberg Co.)

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from article Crushing and pulverizing

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Types of roll crusher. (a) Single-roll. (b) Double-roll. (Link Belt Co.)

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from article Crushing and pulverizing

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Hammer crusher, a secondary crusher for ore, rock, and coal. (Jeffrey Co.)

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from article Crushing and pulverizing

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Two examples of coal crusher. (a) Hammer mill type. (b) Ring type. (Penna Crusher)

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from article Crushing and pulverizing

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Pulverizers. (a) Open-circuit type with preliminary ball mill stage followed by tube mill. (b) Open-circuit three-compartment tube mill. (c) Closed-circuit tube mill with an air separator.

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from article Crushing and pulverizing

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Three-compartment tube mill pulverizer, containing three sizes of balls. (Hardinge Co., Inc.)

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from article Crushing and pulverizing

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Conical ball mill pulverizer in closed circuit with classifier. (Hardinge Co., Inc.)

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from article Crushing and pulverizing

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A pulverizer of the airswept pendulum type. (Raymond Pulverizer Division, Combustion Engineering Co.)

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from article Crushing and pulverizing

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Ball race rock pulverizer for use in closed circuit. (Babcock and Wilcox Co.)

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from article Crushing and pulverizing

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Vibrating screen classifier. (Jeffrey Co.)

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from article Crushing and pulverizing

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Medium-speed bowl-mill coal pulverizer, which feeds burners. (Combustion Engineering Co.)

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from article Crushing and pulverizing

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Medium-speed ball race coal pulverizer, operated under pressure. 10½ in. = 27 cm. (Babcock and Wilcox Co.)

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from article Crushing and pulverizing

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Slow-speed coal pulverizer of the ball mill type; classifier sorts out oversize. (Foster Wheeler Corp.)

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from article Crushing and pulverizing

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High-speed coal pulverizer. (Riley Stoker Corp.)

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from article Cat

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Puma (Puma concolor) and cub in forest. (Credit: Grant Faint/Stockbyte/Getty Images)

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from article Cat

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A domestic cat (Felis catus) nursing her kittens. (Credit: Westend61/Getty Images)

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from article Cat

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Canadian lynx (Lynx canadensis). (Credit: Erwin and Peggy Bauer/U.S. Fish and Wildlife Service)

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from article Cat

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Ocelot (Leopardus pardalis). (Credit: Tom Smylie/U.S. Fish and Wildlife Service)

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from article Cat

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Two cheetahs (Acinonyx jubatus). (Credit: Gary M. Stolz/U.S. Fish and Wildlife Service)

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from article Cat

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Lion (Panthera leo). (Credit: Trisha M. Shears)

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from article Cat

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Siberian tiger (Panthera tigris). (Credit: John and Karen Hollingsworth/U.S. Fish and Wildlife Service)

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from article Current comparator

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Room-temperature alternating-current (ac) comparator.

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from article Current comparator

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Cryogenic current comparator.

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from article Agricultural machinery

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A tractor pulling a multipurpose machine used for precision tillage and planting. (Credit: Scott Bauer/U.S. Department of Agriculture)

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from article Agricultural machinery

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Agricultural aircraft applying a chemical pesticide on a field. (Credit: jupiterimages/Getty Images)

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from article Agricultural machinery

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A combine harvester hopper filling up with corn kernels as the machine harvests the field. (Credit: Glow Images)

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from article Agricultural machinery

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A harvester machine is used to drop tomatoes into a container. (Credit: Phil Schermeister/National Geographic RF/Getty Images)

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from article Lemming

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The lemming, a small burrowing rodent with short legs and stout claws adapted for digging. (Photo by Robert R. Nack, Minnesota Cooperative Fish and Wildlife Research Unit)

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from article Magnetic levitation

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Attraction-type suspension system. (a) Electromagnet-guideway (track) geometry with flux linkages between the magnet and the track. (b) Basic state feedback controller. Here, v(t) is the voltage input to the power amplifier, and z(t) is the second…

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