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The Smart-UPS is a series of enterprise-level uninterruptible power supplies (UPS) made by American Power Conversion (APC). [1] Most of the units have a SmartSlot (with the exception of SC and SMC series) which accepts an optional interface card providing features ranging from network connectivity to temperature and humidity monitoring. [2]
APC was founded in 1981 by three MIT Lincoln Lab electronic power engineers. Originally, the engineers focused on solar power research and development. [ 2 ] When government funding for their research ended, APC shifted its focus to power protection by introducing its first UPS in 1984.
The first carriers – the Bren Gun Carrier and the Scout Carrier which had specific roles – entered service before the war, but a single improved design that could replace these, the Universal, was introduced in 1940. The vehicle was used widely by British Commonwealth forces during the Second World War.
The 3-inch gun M5 was an anti-tank gun developed in the United States during World War II.The gun combined a 3-inch (76.2 mm) barrel of the anti-aircraft gun T9 and elements of the 105 mm howitzer M2.
In 1943 a program was initiated to replace the 6-pounder with the Ordnance QF 75 mm, a dual role weapon with better HE performance. By 1944 only the Churchill Mk III and Mk IV still mounted the 6-pounder Mk V gun and these were able to take advantage of the new APDS round which could penetrate 140mm of armor at 1,000 yards.
Internal view of a solar inverter. Note the many large capacitors (blue cylinders), used to buffer the double line frequency ripple arising due to single-phase ac system.. A solar inverter or photovoltaic (PV) inverter is a type of power inverter which converts the variable direct current (DC) output of a photovoltaic solar panel into a utility frequency alternating current (AC) that can be ...