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"Leopard 2 Improved" was a series of three prototypes used to test possible further enhancements beyond the Leopard 2A4 model, developed beginning in 1988. [251] After a concept phase, a component test bed (KVT, Komponentenversuchsträger) was built in 1989, followed by two troop trial vehicles (TVM, Truppenversuchsmuster). The Leopard 2 ...
A three-phase motor is more compact and less costly than a single-phase motor of the same voltage class and rating, and single-phase AC motors above 10 hp (7.5 kW) are uncommon. Three-phase motors also vibrate less and hence last longer than single-phase motors of the same power used under the same conditions. [32]
For example, balanced two-phase power can be obtained from a three-phase network by using two specially constructed transformers, with taps at 50% and 86.6% of the primary voltage. This Scott T connection produces a true two-phase system with 90° time difference between the phases.
An American Rotary Phase Converter with a Transformer. A phase converter is a device that converts electric power provided as single phase to multiple phase or vice versa. The majority of phase converters are used to produce three-phase electric power from a single-phase source, thus allowing the operation of three-phase equipment at a site that only has single-phase electrical service.
One voltage cycle of a three-phase system. A polyphase system (the term coined by Silvanus Thompson) is a means of distributing alternating-current (AC) electrical power that utilizes more than one AC phase, which refers to the phase offset value (in degrees) between AC in multiple conducting wires; phases may also refer to the corresponding terminals and conductors, as in color codes.
A second army was sent from the east across Magama to attack Polonnaruwa from the east. The third and main force advanced across the country, led by the king. Surrounded by these three armies, Polonnaruwa was besieged for seven months before king Vijayabahu's forces entered the city. In 1070, Vijayabahu became the ruler of Polonnaruwa.
It was first shown at the Exposition in Paris, 1900. [3] In the year prior to the invention of Kodak's camera, the first mass-produced American panoramic camera, the Al-Vista, was introduced in 1898. In 1907, the German Ernemann company developed a "panorama-in-the-round camera" (Panorama-Rundkamera) with a 360-degree viewing angle. [4]
Diplomatic and cultural relations with Burma and Polonnaruwa existed long since the rise of the Burmese Pagan dynasty in the 9th century. After the Chola conquest of Anuradhapura, Sri Lanka experienced a decline in Buddhism and Vijayabahu I, who was the monarch of Polonnaruwa during the time, requested Buddhist monks from Pagan Burma to restore the Sangha in Sri Lanka.