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Later thermionic vacuum tubes, mostly miniature style, some with top cap connections for higher voltages. A vacuum tube, electron tube, [1] [2] [3] thermionic valve (British usage), or tube (North America) [4] is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.
In December 1949, Muroc was renamed Edwards Air Force Base in honor of Captain Glen Edwards (1918–1948), who was killed a year earlier in the crash of the Northrop YB-49 Flying Wing. [6] During World War II , he flew A-20 Havoc light attack bombers in the North African campaign on 50 hazardous, low-level missions against German tanks, convoys ...
Cathode-ray tube cross section diagram ... (referred to as the "ultor" [1] in some receiving tube manuals) ... [299] [300] [301] Formerly mercury vacuum pumps were ...
Such pumps inexpensively produce extremely low pressures in ultra-high vacuum systems. Occurrence Titanium is the ninth-most abundant element in Earth 's crust (0.63% by mass ) [ 30 ] and the seventh-most abundant metal.
Since all pumps require well-developed inlet flow to meet their potential, a pump may not perform or be as reliable as expected due to a faulty suction piping layout such as a close-coupled elbow on the inlet flange. When poorly developed flow enters the pump impeller, it strikes the vanes and is unable to follow the impeller passage.
On 24 December 2013, astronauts installed a new ammonia pump for the station's cooling system. The faulty cooling system had failed earlier in the month, halting many of the station's science experiments. Astronauts had to brave a "mini blizzard" of ammonia while installing the new pump. It was only the second Christmas Eve spacewalk in NASA ...
"JD Edwards" was founded in 1977 by Jack Thompson, Dan Gregory, and Ed McVaney; the company's name is drawn from the initials "J" for Jack, "D" for Dan, and "Edwards" for Ed. McVaney took a salary cut from $44,000 to $36,000 to ensure initial funding.
Each pulse causes the targeted chamber(s) to contract and pump blood, [3] thus regulating the function of the electrical conduction system of the heart. The primary purpose of a pacemaker is to maintain an even heart rate , either because the heart's natural cardiac pacemaker provides an inadequate or irregular heartbeat, or because there is a ...