More complex Curie-point irons circulate a high-frequency AC current through the tip, using magnetic physics to direct heating only where the surface of the tip drops below the Curie point.
12.
During this time Baer had also become interested in utilizing solar energy for direct heating of buildings, inspired by reading Farrington Daniels "'Direct Use of the Sun s Energy ".
13.
:: : I wouldn't expect much direct heating of the air by radiation, since a few feet ( or meters ) of air absorbs a very small percentage of infrared light.
14.
The sewerthermal system will take advantage of relatively constant high temperatures of effluent water and will use only 20 percent or less power than what is needed for a traditional, direct heating system.
15.
The asteroid or a chunk of it would be evaporated just as solid things next to a nuclear blast on the Earth are evaporated, due to direct heating by radiation, and this would form a fireball.
16.
They note that the Sun's overall radiance appears to ebb by only about one-tenth of 1 percent during the solar cycle _ which is too small to account for dramatic change on Earth, at least by direct heating.
17.
Much of the infrared and visible energy released is caused by the direct heating of the quartz material, 97 % of the near infrared is absorbed by the silica quartz glass tube causing the temperature of the tube wall to increase, this causes the silicon-oxygen bond to radiate far infrared rays.
18.
This causes the cathode to releases electrons into the vacuum, a process called thermionic emission . ( Some valves use " direct heating ", in which a tungsten filament acts as both heater and cathode . ) The alternating voltage to be rectified is applied between the cathode and the concentric plate electrode.
