Search results
Results from the WOW.Com Content Network
In theory, it may be possible to search for antihydrogen atoms by measuring the polarization of the 21-cm line in an external magnetic field. [19] Deuterium has a similar hyperfine spectral line at 91.6 cm (327 MHz), and the relative strength of the 21 cm line to the 91.6 cm line can be used to measure the deuterium-to-hydrogen (D/H) ratio.
Detecting the 21 cm emission from this time, all the way through to the end of reionization, has been proposed as a powerful way of studying early structure formation. [9] This period of the Universe's history corresponds to redshifts of z ≈ 30 {\displaystyle z\approx 30} to z ≈ 6 − 12 {\displaystyle z\approx 6-12} , implying a frequency ...
21 cm A No. 2 = Model 1887/L35 [5] [6] The 21 cm A No. 1 was used on: Evertsen-class coastal defence ship – two mounted 21 cm L/35 turret guns fore and one aft [7] Ever-class gunboat – one forward shielded 21 cm L/35 gun after 1890s refits [8] The 21 cm A No. 2 was used on: HNLMS Koningin Wilhelmina der Nederlanden – secondary armament of ...
The 21 cm RK L/19 was created by adapting the old massive guns. The navy had Krupp change some of her 21 cm guns of 9,000 kg to short 21 cm Ring Kanone, which later became the 21 cm RK L/19. [48] The length of 150" (3,923 mm) shows that the navy made the "kurze 21 cm Ring Kanone" from the 9,000 kg massive guns.
The 21 cm Schnelladekanone Länge 40, abbreviated as 21 cm SK L / 40, was a German naval gun developed in the years before World War I that armed a number of the Imperial German Navy's protected and armored cruisers. Later spare guns were adapted to railway guns during World War I and later employed as coastal artillery during World War II. [1]
Areas of Los Angeles County in Southern California are under mandatory evacuation orders following multiple fires that have started.
The bird flu outbreak has taken concerning turns, with more than 60 human cases confirmed. Experts outlined four signs that the virus is going in the wrong direction.
The 21 cm M1880 was a heavy mortar that was designed to provide high-angle indirect fire for siege operations. It could be used to either attack or defend fortified areas. In defense, the mortar was used to provide high-angle fire to destroy enemy communications, supply, and attack trenches dug by an attacker during siege operations or it could be used by an attacker to destroy gun turrets ...