Vibration of a Cylindrical Tunnel under a Centric Point
Underground tunnels are vulnerable to terrorists#x2019; bombing attacks, which calls for studies on tunnel#x2019;s response to internal explosive loading. In this paper, the dynamic response of a cylindrical tunnel to an ideal centric point explosion was treated as an axisymmetric 2-dimensional problem, in which the tunnel was modeled with a continuous anisotropic shell,
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2019/11/26The Proving Ring Design. The proving ring is a device used to measure force. It consists of an elastic ring of known diameter with a measuring device located in the center of the ring. Proving rings come in a variety of sizes.They are made of a steel alloy. Manufacturing consists of rough machining from annealed forgings, heat treatment, and
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Widely considered to be the worst accident  is the 1955 crash at Le Mans that killed driver Pierre Levegh and approximately 80 spectators with over 100 being injured in total. This is a list alphabetically sorted, and structured after the kind of competition, of the more notable driver deaths, excluding those of motorcycle riders .
2018/8/16Do not install the product on an unstable or vibrating surface (insecure shelf, sloped surface, etc.) • The product may fall and become damaged and/or cause an injury. • Using the product in an area with excess vibration may damage the product or cause a fire.
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History The mechanical belt drive, using a pulley machine, was first mentioned in the text the Dictionary of Local Expressions by the Han Dynasty philosopher, poet, and politician Yang Xiong (53–18 BC) in 15 BC, used for a quilling machine that wound silk fibers on to bobbins for weavers' shuttles. 
Vibration of a Cylindrical Tunnel under a Centric Point
Underground tunnels are vulnerable to terrorists#x2019; bombing attacks, which calls for studies on tunnel#x2019;s response to internal explosive loading. In this paper, the dynamic response of a cylindrical tunnel to an ideal centric point explosion was treated as an axisymmetric 2-dimensional problem, in which the tunnel was modeled with a continuous anisotropic shell, while the ground