What is Ground vibration boom?

The Bar class were a class of boom defence vessels of the Royal Navy, Royal Australian Navy and South African Navy during World War II.

Tudor Sports Ground is a public park between Clifford Road and the East Coast Main Railway Line in New Barnet in the London Borough of Barnet. It is one of...

The Eastern Theater Command Ground Force is the ground force under the Eastern Theater Command. Its headquarters is in Fuzhou, Fujian. The current commander is Kong Jun and the current...

Southern Theater Command Ground Force is the ground force under the Southern Theater Command. Its headquarters is in Nanning, Guangxi. The current commander is Zhang Jian  and the current political...

The Western Theater Command Ground Force is the ground force under the Western Theater Command. Its headquarters is in Lanzhou, Gansu. The current political commissar is Xu Deqing.

The Northern Theater Command Ground Force is the ground force under the Northern Theater Command. Its headquarters is in Jinan, Shandong. The current commander is Shi Zhenglu  and the current...

The Central Theater Command Ground Force is the ground force under the Central Theater Command. Its headquarters is in Shijiazhuang, Hebei. The current commander is Fan Chengcai  and the current...

The 'Ground Ceremony' is a ritual used in some airforces, for example the US Airforce, signifying the handing off of the aircraft by the chief ground mechanic to the pilot,...

A boom or a chain is an obstacle strung across a navigable stretch of water to control or block navigation. In modern times they usually have civil uses, such as...

A ground-adjustable propeller is a simple type of aircraft variable-pitch propeller where the blade angle can be adjusted between pre-set limits of fine and coarse pitch. As its name implies,...