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Toothed belts are used widely in mechanical devices, including sewing machines, photocopiers and many others. A major use of toothed belts is as the timing belt used to drive the camshafts within an automobile or motorcycle engine. As toothed belts can deliver more power than a friction-drive belt, they are used for high-power transmissions.
In 2011, Jessica Hoover and Shannon Stahl disclosed improved conditions for selective oxidation of primary alcohols to aldehydes using a (bpy)copper(I)/TEMPO system. [1] While several catalytic aerobic oxidation systems were known at the time, many utilized palladium , which can be prohibitive through its expense [ 16 ] and its cross-reactivity ...
The main disadvantage is that belts wear over time, therefore belt replacement is recommended at specific intervals. [5] [6] Replacement of the engine's water pump at the same time is often recommended, since the water pump is also subject to wear and easily accessed during the replacement of the timing belt.
Enjoy a word-linking puzzle game where you clear space for flowers to grow by spelling words.
The slat armor on the Stryker vehicles is effective against HEAT rounds. In May 2009, General Dynamics and Rafael won a contract to provide SRAT tiles to replace slat armor on Strykers. The additional weight of the two systems is comparable, but reactive armor tiles offer greater vehicle stability and maneuverability and "assured" rather than ...
Work on the Antonov An-225 began in 1984 with a request from the Soviet government for a large airlifter as a replacement for the Myasishchev VM-T. [2] The specifics of this request included the ability to carry a maximum payload of 231,838 kilograms (511,116 lb), both externally and internally, while operating from any runway of at least 3,500 ...