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Lamb's theoretical formulations have found substantial practical application, especially in the field of non-destructive testing. The term Rayleigh–Lamb waves embraces the Rayleigh wave, a type of wave that propagates along a single surface. Both Rayleigh and Lamb waves are constrained by the elastic properties of the surface(s) that guide them.
State parks are owned by the state and generally administered by the Illinois Department of Natural Resources. [3] Specifically, “State Park” refers to sites “exhibiting exceptional scenic and natural features and terrain” and that “offer a wide range of recreational opportunities for the public to enjoy”. [4]
Rayleigh waves are a type of surface acoustic wave that travel along the surface of solids. They can be produced in materials in many ways, such as by a localized impact or by piezo-electric transduction, and are frequently used in non-destructive testing for detecting defects.
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Plates with serials 1 through 999 had "ILL-34" at the bottom; plates with serials 1000 through 9999 had "ILLINOIS-34"; and plates with serials 10-000 and up had "ILLINOIS-1934". The latter two groups were the first plates to feature the full state name. 1935 Blue on white with border line; "ILL-35", "ILLINOIS-35" or "ILLINOIS-1935" at top none
Cache River State Natural Area; Cahokia; Cape Bend State Fish and Wildlife Area; Carlyle Lake State Fish and Wildlife Area; Castle Rock State Park (Illinois) Cave-in-Rock State Park; Cave-In-Rock, Illinois; Chain O'Lakes State Park (Illinois) Channahon State Park; Clinton Lake State Recreation Area; Coffeen Lake State Fish and Wildlife Area
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Part of Horseshoe Lake State Fish and Wildlife Area. Illinois Beach Nature Preserve: 1980: Lake: State The site is a part of Illinois Beach State Park, and contains a wide range of savanna, prairie, wetland and beach ecosystems, as well as numerous endangered species.