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An industrial microwave tunnel oven for heating plastic parts prior to extrusion. Microwave heating, as distinct from RF heating, is a sub-category of dielectric heating at frequencies above 100 MHz, where an electromagnetic wave can be launched from a small dimension emitter and guided through space to the target.
If the material is not a dielectric material with dipoles or an ionic distribution, there is no interaction with microwaves and no heating. Non-thermal effects in liquids are almost certainly non-existent, [1] [2] as the time for energy redistribution between molecules in a liquid is much less than the period of a microwave oscillation.
Acting as internal heat source, microwave absorption is able to heat the target compounds without heating the entire furnace or oil bath, which saves time and energy. [7] It is also able to heat sufficiently thin objects throughout their volume (instead of through its outer surface), in theory producing more uniform heating.
A microwave oven or simply microwave is an electric oven that heats and cooks food by exposing it to electromagnetic radiation in the microwave frequency range. [1] This induces polar molecules in the food to rotate and produce thermal energy (heat) in a process known as dielectric heating.
Sharp Corporation (シャープ株式会社, Shāpu Kabushiki-gaisha) is a Japanese electronics company. [4] [5] It is headquartered in Sakai, Osaka, and was founded by Tokuji Hayakawa in 1912 in Honjo, Tokyo, and established as the Hayakawa Metal Works Institute in Abeno-ku, Osaka, in 1924. [6]
Microwave ovens are not tuned to any specific resonant frequency for water molecules in the food. They cook food via dielectric heating of polar molecules, notably water and fats. Microwave ovens do not cook food from the inside out. 2.45 GHz microwaves can only penetrate approximately 1–1.5 inches (2.5–3.8 centimeters) into most foods.
Kelvinator ad from 1920 Kelvinator refrigerator, c. 1926. The enterprise was established on September 18, 1914, in Detroit, Michigan, United States, by engineer Nathaniel B. Wales, who introduced his idea for a practical electric refrigeration unit for the home to Edmund Copeland and Arnold Goss.
In June 2018, Toshiba sold 80.1% of its Client Solutions (personal computers) business unit to Sharp for $36m, with an option allowing Sharp to buy the remaining 19.9% share. [97] Sharp renamed the business to Dynabook, a brand name Toshiba had used in Japan, and started releasing products under that name. On 30 June 2020, Sharp exercised its ...
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