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2017 North Korean Nuclear Test
The Democratic People's Republic of Korea (North Korea) conducted its sixth (and most recent to date) nuclear test on 3 September 2017, stating it had tested a thermonuclear weapon (hydrogen bomb). The United States Geological Survey reported an earthquake of 6.3-magnitude not far from North Korea's Punggye-ri nuclear test site. South Korean authorities said the earthquake seemed to be artificial, consistent with an underground nuclear test. The USGS, as well as China Earthquake Networks Center, reported that the initial event was followed by a second, smaller, earthquake at the site, several minutes later, which was characterized as a collapse of the cavity formed by the initial detonation. Nuclear device The North Korean government announced that it had detonated a hydrogen (thermonuclear) bomb that could be loaded onto an intercontinental ballistic missile (ICBM). The announcement stated the warhead had a variable yield "the explosive power of which is adjustable from ten ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Geological Survey
The United States Geological Survey (USGS), formerly simply known as the Geological Survey, is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The organization's work spans the disciplines of biology, geography, geology, and hydrology. The USGS is a fact-finding research organization with no regulatory responsibility. The agency was founded on March 3, 1879. The USGS is a bureau of the United States Department of the Interior; it is that department's sole scientific agency. The USGS employs approximately 8,670 people and is headquartered in Reston, Virginia. The USGS also has major offices near Lakewood, Colorado, at the Denver Federal Center, and Menlo Park, California. The current motto of the USGS, in use since August 1997, is "science for a changing world". The agency's previous slogan, adopted on the occasion of its hundredt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Warhead
A warhead is the forward section of a device that contains the explosive agent or toxic (biological, chemical, or nuclear) material that is delivered by a missile, rocket, torpedo, or bomb. Classification Types of warheads include: * Explosive: An explosive charge is used to disintegrate the target, and damage surrounding areas with a blast wave. ** Conventional: Chemicals such as gunpowder and high explosives store significant energy within their molecular bonds. This energy can be released quickly by a trigger, such as an electric spark. Thermobaric weapons enhance the blast effect by utilizing the surrounding atmosphere in their explosive reactions. ***Blast: A strong shock wave is provided by the detonation of the explosive. *** Fragmentation: Metal fragments are projected at high velocity to cause damage or injury. *** Continuous rod: Metal bars welded on their ends form a compact cylinder of interconnected rods, which is violently expanded into a contiguous zig-zag-shape ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edwin Lyman
Edwin S. Lyman is a physicist and the Director of Nuclear Power Safety with the Union of Concerned Scientists (UCS). He specializes in nuclear proliferation, nuclear terrorism, and nuclear power safety. Lyman has published extensively in journals and magazines, testified before Congress and advised other government groups, and been cited in many news stories. He acted as an expert analyst for damage to the Fukushima Daiichi nuclear power plant after the 2011 Tōhoku earthquake and tsunami and co-authored ''Fukushima: The Story of a Nuclear Disaster'' (New Press, 2014). Education Lyman earned his A.B. in physics at New York University in 1986. At Cornell University he received his M.Sc. in 1990 and his Ph.D. in physics in 1992. He focused on string theory and high energy physics, preferring research with few military applications. Career From 1992 to 1995, Lyman did postdoctoral research on science and security policy at Princeton University in the Center for Energy a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scientific American
''Scientific American'', informally abbreviated ''SciAm'' or sometimes ''SA'', is an American popular science magazine. Many famous scientists, including Albert Einstein and Nikola Tesla, have contributed articles to it. In print since 1845, it is the oldest continuously published magazine in the United States. ''Scientific American'' is owned by Springer Nature, which in turn is a subsidiary of Holtzbrinck Publishing Group. History ''Scientific American'' was founded by inventor and publisher Rufus Porter (painter), Rufus Porter in 1845 as a four-page weekly newspaper. The first issue of the large format newspaper was released August 28, 1845. Throughout its early years, much emphasis was placed on reports of what was going on at the United States Patent and Trademark Office, U.S. Patent Office. It also reported on a broad range of inventions including perpetual motion machines, an 1860 device for buoying vessels by Abraham Lincoln, and the universal joint which now can be found ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ivy King
Ivy King was the largest pure- fission nuclear bomb ever tested by the United States. The bomb was tested during the Truman administration as part of Operation Ivy. This series of tests involved the development of very powerful nuclear weapons in response to the nuclear weapons program of the Soviet Union. The production of Ivy King was hurried to be ready in case its sister project, Ivy Mike, failed in its attempt to achieve a thermonuclear reaction. The Ivy King test actually took place two weeks after the Mike test. Unlike the Mike bomb, the Ivy King device could theoretically have been added to United States' nuclear arsenal, because it was designed to be air-deliverable. On November 16, 1952 at 11:30 local time (23:30 GMT) a B-36H bomber dropped the bomb over a point north of Runit Island in the Enewetak atoll, resulting in a 540 kiloton explosion at . The tropopause height at the time of the detonation was about . The top of the King cloud reached about with the mushr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nuclear Weapon
A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission (fission bomb) or a combination of fission and fusion reactions ( thermonuclear bomb), producing a nuclear explosion. Both bomb types release large quantities of energy from relatively small amounts of matter. The first test of a fission ("atomic") bomb released an amount of energy approximately equal to . The first thermonuclear ("hydrogen") bomb test released energy approximately equal to . Nuclear bombs have had yields between 10 tons TNT (the W54) and 50 megatons for the Tsar Bomba (see TNT equivalent). A thermonuclear weapon weighing as little as can release energy equal to more than . A nuclear device no larger than a conventional bomb can devastate an entire city by blast, fire, and radiation. Since they are weapons of mass destruction, the proliferation of nuclear weapons is a focus of international relations policy. Nuclear weapons have been d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nuclear Threat Initiative
The Nuclear Threat Initiative, generally referred to as NTI, is a non-profit organization located in Washington, D.C. The American foreign policy think tank was founded in 2001 by former U.S. Senator Sam Nunn and describes itself as a "nonprofit, nonpartisan global security organization focused on reducing nuclear and biological threats imperiling humanity." NTI has four policy programs: the Global Nuclear Policy Program, Nuclear Materials Security, Scientific and Technical Affairs, and Global Biological Policy and Programs (stylized as NTI , bio). Mission NTI's self-described mission is "to transform global security by driving systemic solutions to nuclear and biological threats imperiling humanity." History NTI was founded in 2001 by former U.S. Senator Sam Nunn and philanthropist Ted Turner. The launch event was held at the National Press Club on January 8, 2001. An event celebrating NTI’s 20th anniversary was held on April 12, 2022, with a one-year delay due to the COVID ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Middlebury Institute Of International Studies At Monterey
The Middlebury Institute of International Studies at Monterey (MIIS), formerly known as the Monterey Institute of International Studies, is an American graduate school of Middlebury College, a private college in Middlebury, Vermont. Established in 1955, the school provides instruction on a campus in Monterey, California. The institute offers a wide range of master's programs and certificates in various disciplines such as environmental policy, international policy, language teaching, and translation and interpretation. MIIS has two graduate professional schools known as the Graduate School of Translation, Interpretation, and Language Education (GSTILE) and the Graduate School of International Policy and Management (GSIPM), and several related centers. History Founding and expansion The Middlebury Institute was established in 1955 as the Monterey Institute for Foreign Studies (MIFS). In 1961, the school moved to its current downtown Monterey location, where it has since occupied ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boosted Fission Weapon
A boosted fission weapon usually refers to a type of nuclear bomb that uses a small amount of fusion fuel to increase the rate, and thus yield, of a fission reaction. The neutrons released by the fusion reactions add to the neutrons released due to fission, allowing for more neutron-induced fission reactions to take place. The rate of fission is thereby greatly increased such that much more of the fissile material is able to undergo fission before the core explosively disassembles. The fusion process itself adds only a small amount of energy to the process, perhaps 1%. The alternative meaning is an obsolete type of single-stage nuclear bomb that uses thermonuclear fusion on a large scale to create fast neutrons that can cause fission in depleted uranium, but which is not a two-stage hydrogen bomb. This type of bomb was referred to by Edward Teller as "Alarm Clock", and by Andrei Sakharov as "Sloika" or "Layer Cake" (Teller and Sakharov developed the idea independently, as far a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Royal United Services Institute
The Royal United Services Institute (RUSI, Rusi), registered as Royal United Service Institute for Defence and Security Studies and formerly the Royal United Services Institute for Defence Studies, is a British defence and security think tank. It was founded in 1831 by the Duke of Wellington, Sir Arthur Wellesley. The current President of RUSI is the Duke of Kent and its Director-General is Karin von Hippel. History RUSI was founded in 1831 – making it the oldest defence and security think tank in the world – at the initiative of the Duke of Wellington. Its original mission was to study naval and military science. The Duke of Wellington spearheaded the establishment of RUSI in a letter to ''Colbourn's United Service Journal'' arguing that "a United Service Museum" should be formed, managed entirely by naval and military officers, and under patronage of the monarch, then King George IV, and the commanders-in-chief of the armed forces. Such an institution woul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paul H
Paul may refer to: *Paul (given name), a given name (includes a list of people with that name) *Paul (surname), a list of people People Christianity *Paul the Apostle (AD c.5–c.64/65), also known as Saul of Tarsus or Saint Paul, early Christian missionary and writer *Pope Paul (other), multiple Popes of the Roman Catholic Church *Saint Paul (other), multiple other people and locations named "Saint Paul" Roman and Byzantine empire *Lucius Aemilius Paullus Macedonicus (c. 229 BC – 160 BC), Roman general *Julius Paulus Prudentissimus (), Roman jurist *Paulus Catena (died 362), Roman notary *Paulus Alexandrinus (4th century), Hellenistic astrologer *Paul of Aegina or Paulus Aegineta (625–690), Greek surgeon Royals *Paul I of Russia (1754–1801), Tsar of Russia *Paul of Greece (1901–1964), King of Greece Other people *Paul the Deacon or Paulus Diaconus (c. 720 – c. 799), Italian Benedictine monk *Paul (father of Maurice), the father of Maurice, Byzan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
38 North
''38 North'' is a website devoted to analysis about North Korea. Its name refers to the 38th parallel north which passes through the Korean peninsula and from 1945 until the start of the Korean War in 1950 divided the peninsula into North and South Korea. Formerly a program of the US-Korea Institute at Johns Hopkins University's Paul H. Nitze School of Advanced International Studies, it is now housed at the Stimson Center and is managed by former U.S. Department of State official Joel S. Wit and Managing Editor Jenny Town. Notable contributors include nuclear scientist Sigfried Hecker, former Associated Press Pyongyang Bureau Chief Jean H. Lee, cybersecurity expert James Andrew Lewis, and North Korea Tech founder Martyn Williams. Satellite imagery analysis ''38 North'' uses commercial satellite imagery of key areas of interest in North Korea, providing its analysts with the opportunity to uncover insight into developments within the country. In November 2013, ''38 North'' pub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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