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In common usage, the prefix dipolar, dative or coordinate merely serves to indicate the origin of the electrons used in creating the bond. For example, F 3 B ← O(C 2 H 5) 2 ("boron trifluoride (diethyl) etherate") is prepared from BF 3 and :O(C 2 H 5) 2, as opposed to the radical species [•BF 3] – and [•O(C 2 H 5) 2] +.
The first TU6A was built in 1973 at the Kambarka Engineering Works. 3,915 TU6A locomotives were produced until 1988.The locomotives were used on many narrow gauge railways to move cargo as well as passenger trains.
A network solid or covalent network solid (also called atomic crystalline solids or giant covalent structures) [1] [2] is a chemical compound (or element) in which the atoms are bonded by covalent bonds in a continuous network extending throughout the material.
The oxygen molecule, O 2 can also be regarded as having two 3-electron bonds and one 2-electron bond, which accounts for its paramagnetism and its formal bond order of 2. [14] Chlorine dioxide and its heavier analogues bromine dioxide and iodine dioxide also contain three-electron bonds. Molecules with odd-electron bonds are usually highly ...
Diesel locomotive TU8 (ТУ8) is used for transportation & shunting services on narrow-gauge railways with a track gauge ranging from 750 mm (2 ft 5 + 1 ⁄ 2 in) to 1,067 mm (3 ft 6 in). The TU8 was developed in 1987 – 1988 at the Kambarka Engineering Works to replace the ageing locomotive classes TU6A ( ТУ6А ).
The twenty-foot equivalent unit (abbreviated TEU or teu) is a general unit of cargo capacity, often used for container ships and container ports. [1] It is based on the volume of a 20-foot-long (6.1 m) intermodal container, a standard-sized metal box that can be easily transferred between different modes of transportation, such as ships, trains, and trucks.
Desktop model of Tupolev ANT-28. In parallel with design of the ANT-26, the Tupolev Design bureau envisaged a vastly scaled-up ANT-20 with the same dimensions as the ANT-26 under the internal designation ANT-28 It was intended as an airliner and cargo plane with a maximum payload of 15,000 kg and a range of 1,500 km, and the arrangement of the engines was the same as for the TB-6.
Under Ivan Pogosski and guided by Andrei Tupolev, TsAGI developed the ANT-7 from the Tupolev TB-1 by scaling it down by about one third. [1] Power for the ANT-7 was intended to be provided by two 388 kW (520 hp) – 455 kW (610 hp) Hispano Suiza engines or 313 kW (420 hp) Bristol Jupiter engines, but the prototype was powered by two 373 kW (500 hp) – 529 kW (709 hp) BMW VI engines.