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All-metal systems can be configured which are compatible with high vacuums and other adverse environments such as high temperatures. These isolation systems enable vibration-sensitive instruments such as scanning probe microscopes, micro-hardness testers and scanning electron microscopes to operate in severe vibration environments sometimes ...
The Coast Guard has signed a multi-year contract for 180 Response Boat – Medium (RB-M) boats that were delivered starting in 2008 to replace the 41′ UTB boats. These aluminum boats are 45 feet (14 m) in length, with twin diesel engines (total 825 hp), are self-righting, have a four crew, six passenger capacity, are equippable with two .50 ...
Vibration mode of a clamped square plate. The vibration of plates is a special case of the more general problem of mechanical vibrations.The equations governing the motion of plates are simpler than those for general three-dimensional objects because one of the dimensions of a plate is much smaller than the other two.
In general, exact solutions for cantilever plates using plate theory are quite involved and few exact solutions can be found in the literature. Reissner and Stein [7] provide a simplified theory for cantilever plates that is an improvement over older theories such as Saint-Venant plate theory.
Bending of plates, or plate bending, refers to the deflection of a plate perpendicular to the plane of the plate under the action of external forces and moments. The amount of deflection can be determined by solving the differential equations of an appropriate plate theory .
Orifice plate showing vena contracta. An orifice plate is a thin plate with a hole in it, which is usually placed in a pipe. When a fluid (whether liquid or gaseous) passes through the orifice, its pressure builds up slightly upstream of the orifice [1] but as the fluid is forced to converge to pass through the hole, the velocity increases and the fluid pressure decreases.
Maps and electoral vote counts for the 2012 presidential election. Our latest estimate has Obama at 323 electoral votes and Romney at 191.
This boat was designed by Comte de Lambert. [8] This had 5 variable pitch fins on the hull beneath the water so inclined that when the boat begins to move "the boat rises and the planes come to the surface" with the result that "it skims over the surface with little but the propellers beneath the surface".