During 1990â2003, Pakistan sustained its historical lead as the second-most urbanized nation in South Asia with city dwellers making up 36% of its population. Furthermore, 50% of Pakistanis now reside in towns of 5,000 people or more.
Submarine Propulsion Systems. During World War II, most American submarines were powered by diesel-electric systems. This was a departure from earlier submarine power systems, which were direct drive types, little changed from the earliest boats. In this direct-drive power system, the diesel engine is directly connected to the propeller shaft.
paddle, and plunger types. A plunger type wave maker is made of a solid submerged body which oscillates vertically into water surface. This vertical motion causes water displacement which in turn generates waves. The plunger cross section could be in different shapes. However, the most general shape is cylindrical or triangular ones [2].