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    2012-7-1 · Air-turbine handpieces have been used for most dental cutting procedures for more than 50 years since the invention of the Borden Air rotor in 1957. 1 Although some improvements such as push-button bur release, swivel coupling, and fiber-optic illumination have made it more convenient for use, the main component, a turbine rotor supported by two miniature ball bearings, remains unchanged. 1 Generally, the ball bearings of air-turbine …

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  • The metal that brought you cheap flights - BBC News

    Copper melted at too low a temperature. But nickel - with a bit of chromium mixed in - was the Goldilocks recipe. It tolerated high temperatures, it was strong, corrosion-resistant, cheap and light.

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    2018-8-1 · Copper/Nickel tube was selected by Bonnet et al. to make a 5 turns of cryogenic PHP. Pre-cooling arrangement was made to reduce the cool-down time. The schematic diagram of PHP setup and pre-cooling system is shown in Fig. 4. The system can reject 150 mW of heat from hotter region at 60 K to colder region at 4.2 K.

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    2018-11-28 · 1. Introduction. Copper is an indispensable material in our modern electricity- and electronics-driven society. It is the most electrically conducting non-precious metal (5.8 × 10 5 S cm −1 at 27°C) [] and the best thermal conductor among metals (401 W m −1 K −1 at 27°C) [].Further, copper has a high current-carrying capacity [], is strong, ductile, workable, and resistant to ...

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    2013-1-1 · Bearing in mind the number of load cycles of a wind turbine as estimated above it is worth noting that the industry standard in fatigue life experimental validation is limited to 2–5 million cycles for blades, and 10 million cycles for coupons; this is a small fraction of the actual number of fatigue cycles sustained by the turbine.

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    2018-11-28 · 1. Introduction. Copper is an indispensable material in our modern electricity- and electronics-driven society. It is the most electrically conducting non-precious metal (5.8 × 10 5 S cm −1 at 27°C) [] and the best thermal conductor among metals (401 W m −1 K −1 at 27°C) [].Further, copper has a high current-carrying capacity [], is strong, ductile, workable, and resistant to ...

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    2013-1-1 · Bearing in mind the number of load cycles of a wind turbine as estimated above it is worth noting that the industry standard in fatigue life experimental validation is limited to 2–5 million cycles for blades, and 10 million cycles for coupons; this is a small fraction of the actual number of fatigue cycles sustained by the turbine.

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    2020-4-30 · The foils were joined by ultrasonic welding using a machine that mechanically vibrates the welding head at 20 kHz. In the work of Bisadi et al., by UAM, the authors lap joined dissimilar sheets of 5083 Al alloy and commercially pure copper method. It was shown that joint defects appear at very low or high welding temperatures.

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    2021-2-1 · IEC 60335-2-34 REDLINE Household and similar electrical appliances – Safety – Part 2-34: Particular requirements for motor-compressors Revision: 2021 edition • Published 03/01/2021. This part of IEC 60335 deals with the safety of sealed (hermetic and semi-hermetic type) motor-compressors, their protection and control systems, if any, which are intended for use in equipment for household ...

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