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By Hongquan Xu

A typical challenge that experimenters face is the alternative of fractional factorial designs. minimal aberration designs are normal in perform. There are occasions within which different designs meet functional wishes higher. a list of designs could support experimenters decide on the simplest layout. in response to coding conception, new tools are proposed to categorise and rank fractional factorial designs successfully. we've got thoroughly enumerated all 27 and 81-run designs, 243-run designs of solution IV or better, and 729-run designs of answer V or greater. a suite of valuable fractional factorial designs with 27, eighty one, 243 and 729 runs is given. This extends the paintings of Chen, sunlight and Wu (1993), who gave a set of fractional factorial designs with sixteen, 27, 32 and sixty four runs.

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Most birds can fly, and this ability has helped them to spread across the world, even to remote islands and polar regions. Like mammals, birds are warm-blooded, but they reproduce by laying eggs. Birds use beaks—toothless jaws that are lightweight but strong—for feeding and preening. NestiNg Most birds build nests to protect their eggs and young. Carmine bee-eaters dig burrows in vertical sandbanks along rivers. 47 48 | BIRDS Birds Birds are warm-blooded, egg-laying vertebrates. Most birds can fly, thanks to their unique features, including lightweight, hollow bones, a light, toothless beak, and feathered wings.

The bird forms a life-long bond with its mate. size 37–40 in (94–100 cm) tall diet Mostly lantern fish habitat Nests on islands, on flat beaches with no snow or ice distribution Southern Atlantic and southern Indian oceans size 21–27 in (53–69 cm) long diet Mainly fish and crustaceans habitat Coastal bays and inlets, temperate forests, Arctic tundra, and freshwater areas distribution Northern North America, northern Eurasia, Mediterranean Sea, Black Sea, and eastern Asia PENGUINS, ALBATROSSES, AND DIVERS Black-browed albatross Thalassarche melanophrys | 55 ENDANGERED Albatrosses spend most of their lives at sea, only returning to land to breed.

Like mammals, birds are warm-blooded, but they reproduce by laying eggs. Birds use beaks—toothless jaws that are lightweight but strong—for feeding and preening. NestiNg Most birds build nests to protect their eggs and young. Carmine bee-eaters dig burrows in vertical sandbanks along rivers. 47 48 | BIRDS Birds Birds are warm-blooded, egg-laying vertebrates. Most birds can fly, thanks to their unique features, including lightweight, hollow bones, a light, toothless beak, and feathered wings. Anatomy Wing bone Tailbone, or pygostyle Beak Wishbone Keel Foot Skeleton of a starling Birds are adapted in ways that make them good at flying.

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