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Mark 27 nuclear bomb From Wikipedia, the free encyclopedia Jump to navigation Jump to search This article does not cite any sources . Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. ( September 2014 ) (Learn how and when to remove this template message) The Mark 27 nuclear bomb and closely related W27 warhead were two American thermonuclear bomb designs from the late 1950s. The Mark 27 was designed by the University of California Radiation Laboratory (UCRL; now Lawrence Livermore National Laboratory) starting in the mid-1950s. The Mark 27 and W27 were produced from 1958; both were retired by 1965. The basic design concept was competing with the Los Alamos Scientific Laboratory (LASL; now Los Alamos National Laboratory) design that would become the Mark 28 / B28 nuclear bomb and W28 warhead. The Mark 27 was roughly twice as heavy as the Mark W28 family and had a

Mark 26 nuclear bomb From Wikipedia, the free encyclopedia Jump to navigation Jump to search The Mark 26 nuclear bomb was related to the Mark 21. Development of the Mk-26 started on 1 September 1954. At the end of July 1955 the design of the Mk-21 was released for production, while the design for the Mk-26 was not. The "Clean" Mk-21C which was tested in the Redwing Navajo shot did not interest the US Air Force, or AEC. As the decision not to pursue the "clean" Mk-21 closely coincided with the decision to terminate development of the Mk-26 in April 1957, it is possible that Mk-26 was the designation for the clean version of the Mk-21. References [ edit ] Hansen, Chuck, "Swords of Armageddon: U.S. Nuclear Weapons Development since 1945" (CD-ROM & download available). PDF-2.67 Mb. 2,600 pages, Sunnyvale, California, Chucklea Publications, 1995, 2007. .mw-parser-output cite.citationfont-style:inherit.mw-parser

Mark 22 nuclear bomb From Wikipedia, the free encyclopedia Jump to navigation Jump to search This article includes a list of references, but its sources remain unclear because it has insufficient inline citations . Please help to improve this article by introducing more precise citations. ( May 2018 ) (Learn how and when to remove this template message) The Mark 22 nuclear bomb (Mk-22) was the first thermonuclear device test by the University of California Radiation Lab (UCRL). The test was part of the Koon shot of Operation Castle. The Mk-22 failed to achieve anything like its intended yield due to premature heating of the secondary from exposure to neutrons. As the other UCRL test planned for the Castle series, the liquid fueled "Ramrod" device had the same basic design flaw, that test was canceled. Within a month of the bomb’s failure, the Mk-22 was terminated because the United States Atomic Energy Commission realized the

Mark 21 nuclear bomb From Wikipedia, the free encyclopedia Jump to navigation Jump to search The Mark 21 nuclear bomb was a United States nuclear gravity bomb first produced in 1955. It was based on the TX-21 "Shrimp" prototype that had been detonated during the Castle Bravo test in March 1954. While most of the Operation Castle tests were intended to evaluate weapons intended for immediate stockpile, or which were already available for use as part of the Emergency Capability Program, Castle Bravo was intended to test a design which would drastically reduce the size and costs of the first generation of air-droppable atomic weapons (the Mk 14, Mk 17 & Mk 24). At 12 feet 6 inches (3.81 m) long, 56 inches (1.42 m) in diameter, and weighing 15,000 pounds (6,800 kg), the Mk-21 was half the length and one-third the weight of the Mk-17/24 weapons it replaced. Its minimum yield was specified at four megatons. Quantity production of t

Clash Royale CLAN TAG #URR8PPP 陳偉泓，攝於麗山高中 陳偉泓 為台北市立建國高級中學退休校長，於2011年7月就任。彰化師範大學教育科學系物理組畢業，淡江大學教育科技所碩士。曾任北一女中教師、中正高中和中山女中教務主任，並曾在任內獲教育部頒發教學卓越獎 [1] ，之後在麗山高中任校長六年。2011年通過遴選成為建國中學校長。 陳偉泓於2012年3月曾公開質疑教育部版本12年國教中的問題，並提出「記取歷史教訓」、「砌磚式配套方案-由上往下重要的磚先砌，打好地基」、「12-K的一貫課程先行」、「有效教學的專業教師發展」等主張，建議應「穩健推動、延後實施」十二年國教 [2] [3] 。 陳偉泓2015年8月自建國中學退休，後受聘為麗山高中校務發展委員會顧問。並任越南丁善理紀念中學教學總監 [4] [5] 。 參考資料 ^ 建中新任校長出爐 麗山高中陳偉泓出線. 大紀元. [ 2013-03-24 ] . （原始内容存档于2012-11-25）.   ^ 建國中學陳偉泓校長演說 ^ 建中校長與教長唱反調！陳偉泓：十二年國教應延後實施. Nownews. 2012-03-24.   ^ 單, 小懿. 人氣建中校長為何出走越南？. 2015-09-02 [ 2015-09-03 ] . （原始内容存档于2015-09-08）.   ^ 單, 小懿. 人氣建中校長為何出走越南？. 2015-09-04 [ 2015-09-06 ] . （原始内容存档于2015-09-08）.   前任： 鄭顯三 臺北市立麗山高級中學校長 2005年7月—2011年7月 繼任： 徐建國 前任： 徐建國 （代理） 臺北市立建國高級中學校長 2011年7月—2015年7月 繼任： 徐建國