125-528: Advena is a South African nuclear weapons production facility, having been transferred in 1979 from the Pelindaba nuclear research center to the state-owned Armaments Corporation of South Africa ( Armscor ), was later developed as the Kentron Circle facility. This facility, built in 1980, and located 20 km (12 mi) west of Pretoria , was subsequently renamed Advena. At Pelindaba, Nuclear weapons of
250-557: 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 deployed twice in war , both by the United States against the Japanese cities of Hiroshima and Nagasaki in 1945 during World War II . Nuclear weapons have only twice been used in warfare, both times by
375-539: A tributary state of China's Qing Empire , which exerted large influence over the conservative Korean officials who gathered around the royal family of the Joseon kingdom. On February 27, 1876, after several confrontations between Korean isolationists and the Japanese, Japan imposed the Japan–Korea Treaty of 1876 , forcing Korea open to Japanese trade. The act blocked any other power from dominating Korea, resolving to end
500-636: A Theory of Civilization", which detailed Western society and his own philosophies. In the Meiji Restoration period, military and economic power was emphasized. Military strength became the means for national development and stability. Imperial Japan became the only non-Western world power and a major force in East Asia in about 25 years as a result of industrialization and economic development. As writer Albrecht Fürst von Urach comments in his booklet "The Secret of Japan's Strength", published in 1942, during
625-592: A chapel of the Russian Consulate. St. Nicholas of Japan made his own translation of the New Testament and some other religious books ( Lenten Triodion , Pentecostarion , Feast Services , Book of Psalms , Irmologion ) into Japanese . Nicholas has since been canonized as a saint by the Patriarchate of Moscow in 1970, and is now recognized as St. Nicholas, Equal-to-the-Apostles to Japan. His commemoration day
750-678: A conference—called for in the manifesto—in Pugwash, Nova Scotia , Eaton's birthplace. This conference was to be the first of the Pugwash Conferences on Science and World Affairs , held in July 1957. By the 1960s, steps were taken to limit both the proliferation of nuclear weapons to other countries and the environmental effects of nuclear testing . The Partial Nuclear Test Ban Treaty (1963) restricted all nuclear testing to underground nuclear testing , to prevent contamination from nuclear fallout, whereas
875-623: A continued collaboration with the Tokugawa, Saigō Takamori , leader of the Satsuma clan, threatened the assembly into abolishing the title shōgun and ordered the confiscation of Yoshinobu's lands. On January 17, 1868, Yoshinobu declared "that he would not be bound by the proclamation of the Restoration and called on the court to rescind it". On January 24, Yoshinobu decided to prepare an attack on Kyoto, occupied by Satsuma and Chōshū forces. This decision
1000-635: A debate over defining the political system of Japan as a dictatorship . The Imperial Japanese Armed Forces initially achieved large-scale military successes during the Second Sino-Japanese War and the Pacific War . However, from 1942 onwards, and particularly after decisive Allied advances at Midway Atoll and Guadalcanal , Japan was forced to adopt a defensive stance against the United States . The American-led island-hopping campaign led to
1125-458: A faster and less vulnerable attack, the development of long-range intercontinental ballistic missiles (ICBMs) and submarine-launched ballistic missiles (SLBMs) has given some nations the ability to plausibly deliver missiles anywhere on the globe with a high likelihood of success. More advanced systems, such as multiple independently targetable reentry vehicles (MIRVs), can launch multiple warheads at different targets from one missile, reducing
1250-647: A fission ("atomic") bomb released an amount of energy approximately equal to 20,000 tons of TNT (84 TJ ). The first thermonuclear ("hydrogen") bomb test released energy approximately equal to 10 million tons of TNT (42 PJ). 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 600 pounds (270 kg) can release energy equal to more than 1.2 megatonnes of TNT (5.0 PJ). A nuclear device no larger than
1375-482: A fission bomb to initiate them. Such a device might provide a simpler path to thermonuclear weapons than one that required the development of fission weapons first, and pure fusion weapons would create significantly less nuclear fallout than other thermonuclear weapons because they would not disperse fission products. In 1998, the United States Department of Energy divulged that the United States had, "...made
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#17330859116211500-421: A fusion weapon as of January 2016 , though this claim is disputed. Thermonuclear weapons are considered much more difficult to successfully design and execute than primitive fission weapons. Almost all of the nuclear weapons deployed today use the thermonuclear design because it results in an explosion hundreds of times stronger than that of a fission bomb of similar weight. Thermonuclear bombs work by using
1625-399: A large amount of the total energy output. All existing nuclear weapons derive some of their explosive energy from nuclear fission reactions. Weapons whose explosive output is exclusively from fission reactions are commonly referred to as atomic bombs or atom bombs (abbreviated as A-bombs ). This has long been noted as something of a misnomer , as their energy comes from the nucleus of
1750-472: A nation's economic electronics-based infrastructure. Because the effect is most effectively produced by high altitude nuclear detonations (by military weapons delivered by air, though ground bursts also produce EMP effects over a localized area), it can produce damage to electronics over a wide, even continental, geographical area. Research has been done into the possibility of pure fusion bombs : nuclear weapons that consist of fusion reactions without requiring
1875-532: A new nuclear strategy, one that is distinct from that which gave relative stability during the Cold War. Since 1996, the United States has had a policy of allowing the targeting of its nuclear weapons at terrorists armed with weapons of mass destruction . Robert Gallucci argues that although traditional deterrence is not an effective approach toward terrorist groups bent on causing a nuclear catastrophe, Gallucci believes that "the United States should instead consider
2000-425: A nuclear war between two nations would result in mutual annihilation. From this point of view, the significance of nuclear weapons is to deter war because any nuclear war would escalate out of mutual distrust and fear, resulting in mutually assured destruction . This threat of national, if not global, destruction has been a strong motivation for anti-nuclear weapons activism. Critics from the peace movement and within
2125-411: A nuclear weapon from another country by threatening nuclear retaliation is known as the strategy of nuclear deterrence . The goal in deterrence is to always maintain a second strike capability (the ability of a country to respond to a nuclear attack with one of its own) and potentially to strive for first strike status (the ability to destroy an enemy's nuclear forces before they could retaliate). During
2250-465: A nuclear weapon is a gravity bomb dropped from aircraft ; this was the method used by the United States against Japan in 1945. This method places few restrictions on the size of the weapon. It does, however, limit attack range, response time to an impending attack, and the number of weapons that a country can field at the same time. With miniaturization, nuclear bombs can be delivered by both strategic bombers and tactical fighter-bombers . This method
2375-409: A nuclear weapon to its target is an important factor affecting both nuclear weapon design and nuclear strategy . The design, development, and maintenance of delivery systems are among the most expensive parts of a nuclear weapons program; they account, for example, for 57% of the financial resources spent by the United States on nuclear weapons projects since 1940. The simplest method for delivering
2500-433: A nuclear weapon with suitable materials (such as cobalt or gold ) creates a weapon known as a salted bomb . This device can produce exceptionally large quantities of long-lived radioactive contamination . It has been conjectured that such a device could serve as a "doomsday weapon" because such a large quantity of radioactivities with half-lives of decades, lifted into the stratosphere where winds would distribute it around
2625-421: A policy of expanded deterrence, which focuses not solely on the would-be nuclear terrorists but on those states that may deliberately transfer or inadvertently leak nuclear weapons and materials to them. By threatening retaliation against those states, the United States may be able to deter that which it cannot physically prevent.". Graham Allison makes a similar case, arguing that the key to expanded deterrence
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#17330859116212750-450: A prospect hard-liners from Satsuma and Chōshū found intolerable. On January 3, 1868, Satsuma-Chōshū forces seized the imperial palace in Kyoto , and the following day had the fifteen-year-old Emperor Meiji declare his own restoration to full power. Although the majority of the imperial consultative assembly was happy with the formal declaration of direct rule by the court and tended to support
2875-503: A significant portion of their energy from fission reactions used to "trigger" fusion reactions, and fusion reactions can themselves trigger additional fission reactions. Only six countries—the United States , Russia , the United Kingdom , China , France , and India —have conducted thermonuclear weapon tests. Whether India has detonated a "true" multi-staged thermonuclear weapon is controversial. North Korea claims to have tested
3000-547: A substantial investment" in the past to develop pure fusion weapons, but that, "The U.S. does not have and is not developing a pure fusion weapon", and that, "No credible design for a pure fusion weapon resulted from the DOE investment". Nuclear isomers provide a possible pathway to fissionless fusion bombs. These are naturally occurring isotopes ( Hf being a prominent example) which exist in an elevated energy state. Mechanisms to release this energy as bursts of gamma radiation (as in
3125-449: A variety of fields to come to Japan to educate the populace. For instance, the judicial system and constitution were modeled after Prussia , described by Saburō Ienaga as "an attempt to control popular thought with a blend of Confucianism and German conservatism ." The government also outlawed customs linked to Japan's feudal past, such as publicly displaying and wearing katana and the top knot , both of which were characteristic of
3250-529: Is February 16. Andronic Nikolsky , appointed the first Bishop of Kyoto and later martyred as the archbishop of Perm during the Russian Revolution , was also canonized by the Russian Orthodox Church as a Saint and Martyr in the year 2000. Divie Bethune McCartee was the first ordained Presbyterian minister missionary to visit Japan, in 1861–1862. His gospel tract translated into Japanese
3375-447: Is a stub . You can help Misplaced Pages by expanding it . 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
3500-420: Is a thermonuclear weapon that yields a relatively small explosion but a relatively large amount of neutron radiation . Such a weapon could, according to tacticians, be used to cause massive biological casualties while leaving inanimate infrastructure mostly intact and creating minimal fallout. Because high energy neutrons are capable of penetrating dense matter, such as tank armor, neutron warheads were procured in
3625-451: Is analogous to identifying a criminal by fingerprints. "The goal would be twofold: first, to deter leaders of nuclear states from selling weapons to terrorists by holding them accountable for any use of their weapons; second, to give leaders every incentive to tightly secure their nuclear weapons and materials." According to the Pentagon's June 2019 " Doctrine for Joint Nuclear Operations " of
3750-403: Is coming up with ways of tracing nuclear material to the country that forged the fissile material. "After a nuclear bomb detonates, nuclear forensics cops would collect debris samples and send them to a laboratory for radiological analysis. By identifying unique attributes of the fissile material, including its impurities and contaminants, one could trace the path back to its origin." The process
3875-526: Is currently better known as the Kaihōrei ( 解放令 Emancipation Edict ). However, the elimination of their economic monopolies over certain occupations actually led to a decline in their general living standards, while social discrimination simply continued. For example, the ban on the consumption of meat from livestock was lifted in 1871, and many former burakumin moved on to work in abattoirs and as butchers . However, slow-changing social attitudes, especially in
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4000-481: Is for the purpose of achieving different yields for different situations , and in manipulating design elements to attempt to minimize weapon size, radiation hardness or requirements for special materials, especially fissile fuel or tritium. Some nuclear weapons are designed for special purposes; most of these are for non-strategic (decisively war-winning) purposes and are referred to as tactical nuclear weapons . The neutron bomb purportedly conceived by Sam Cohen
4125-510: Is frequently referred to as the "Empire of Japan", the "Japanese Empire", or "Imperial Japan" in English. In Japanese it is referred to as Dai Nippon Teikoku ( 大日本帝國 ) , which translates to "Empire of Great Japan" ( Dai "Great", Nippon "Japanese", Teikoku "Empire"). Teikoku is itself composed of the nouns Tei "referring to an emperor" and -koku "nation, state", literally "Imperial State" or "Imperial Realm" (compare
4250-498: Is no evidence that it is feasible beyond the military domain. However, the U.S. Air Force funded studies of the physics of antimatter in the Cold War , and began considering its possible use in weapons, not just as a trigger, but as the explosive itself. A fourth generation nuclear weapon design is related to, and relies upon, the same principle as antimatter-catalyzed nuclear pulse propulsion . Most variation in nuclear weapon design
4375-409: Is not a fusion bomb. In the boosted bomb, the neutrons produced by the fusion reactions serve primarily to increase the efficiency of the fission bomb. There are two types of boosted fission bomb: internally boosted, in which a deuterium-tritium mixture is injected into the bomb core, and externally boosted, in which concentric shells of lithium-deuteride and depleted uranium are layered on the outside of
4500-490: Is not clear that this has ever been implemented, and their plausible use in nuclear weapons is a matter of dispute. The other basic type of nuclear weapon produces a large proportion of its energy in nuclear fusion reactions. Such fusion weapons are generally referred to as thermonuclear weapons or more colloquially as hydrogen bombs (abbreviated as H-bombs ), as they rely on fusion reactions between isotopes of hydrogen ( deuterium and tritium ). All such weapons derive
4625-550: Is the only country to have independently developed and then renounced and dismantled its nuclear weapons. The Treaty on the Non-Proliferation of Nuclear Weapons aims to reduce the spread of nuclear weapons, but there are different views of its effectiveness. There are two basic types of nuclear weapons: those that derive the majority of their energy from nuclear fission reactions alone, and those that use fission reactions to begin nuclear fusion reactions that produce
4750-451: Is the primary means of nuclear weapons delivery; the majority of U.S. nuclear warheads, for example, are free-fall gravity bombs, namely the B61 , which is being improved upon to this day. Preferable from a strategic point of view is a nuclear weapon mounted on a missile , which can use a ballistic trajectory to deliver the warhead over the horizon. Although even short-range missiles allow for
4875-613: The Axis powers period: The rise of Japan to a world power during the past 80 years is the greatest miracle in world history. The mighty empires of antiquity, the major political institutions of the Middle Ages and the early modern era, the Spanish Empire, the British Empire, all needed centuries to achieve their full strength. Japan's rise has been meteoric. After only 80 years, it is one of
5000-694: The Emperor from the Shogun , Japan underwent a period of large-scale industrialization and militarization , often regarded as the fastest modernization of any country to date. All of these aspects contributed to Japan's emergence as a great power following the First Sino-Japanese War , the Boxer Rebellion , the Russo-Japanese War , and World War I . Economic and political turmoil in the 1920s, including
5125-556: The German Kaiserreich ). The name "Empire of Japan" appeared for the first time in the 1854 Convention of Kanagawa between the United States and the Japanese Tokugawa shogunate . This meaning is significant in terms of geography, encompassing Japan, and its surrounding areas. The nomenclature Empire of Japan had existed since the anti-Tokugawa domains, Satsuma and Chōshū , which founded their new government during
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5250-673: The Great Depression , led to the rise of militarism , nationalism , statism and authoritarianism, and this ideological shift eventually culminated in Japan joining the Axis alliance with Nazi Germany and Fascist Italy , and also conquering a large part of the Asia-Pacific . During this period, the Japanese army committed many atrocities, including the Nanjing Massacre . However, there has been
5375-673: The Meiji Restoration , with the intention of forming a modern state to resist Western domination. Later the Empire emerged as a great power in the world. Due to its name in kanji characters and its flag, it was also given the exonyms "Empire of the Sun" and "Empire of the Rising Sun". After two centuries, the seclusion policy, or sakoku , under the shōguns of the Edo period came to an end when
5500-678: The Meiji period , affecting religious practices and institutions. Conversion from traditional faith was no longer legally forbidden, officials lifted the 250-year ban on Christianity, and missionaries of established Christian churches reentered Japan. The traditional syncreticism between Shinto and Buddhism ended. Losing the protection of the Japanese government which Buddhism had enjoyed for centuries, Buddhist monks faced radical difficulties in sustaining their institutions, but their activities also became less restrained by governmental policies and restrictions. As social conflicts emerged in this last decade of
5625-776: The Shrine Consolidation Policy and the Meiji government built the new modern 15 shrines of the Kenmu restoration as a political move to link the Meiji restoration to the Kenmu restoration for their new State Shinto cult. Japanese had to look at old paintings in order to find out what the Horyuji temple used to look like when they rebuilt it. The rebuilding was originally planned for the Shōwa era. The Japanese used mostly concrete in 1934 to rebuild
5750-688: The Starfish Prime high-altitude nuclear test in 1962, an unexpected effect was produced which is called a nuclear electromagnetic pulse . This is an intense flash of electromagnetic energy produced by a rain of high-energy electrons which in turn are produced by a nuclear bomb's gamma rays. This flash of energy can permanently destroy or disrupt electronic equipment if insufficiently shielded. It has been proposed to use this effect to disable an enemy's military and civilian infrastructure as an adjunct to other nuclear or conventional military operations. By itself it could as well be useful to terrorists for crippling
5875-521: The Togetsukyo Bridge , unlike the original destroyed wooden version of the bridge from 836. The idea of a written constitution had been a subject of heated debate within and outside of the government since the beginnings of the Meiji government . The conservative Meiji oligarchy viewed anything resembling democracy or republicanism with suspicion and trepidation, and favored a gradualist approach. The Freedom and People's Rights Movement demanded
6000-578: The Treaty on the Non-Proliferation of Nuclear Weapons (1968) attempted to place restrictions on the types of activities signatories could participate in, with the goal of allowing the transference of non-military nuclear technology to member countries without fear of proliferation. Empire of Japan Unitary parliamentary semi-constitutional monarchy (1889–1947) The Empire of Japan , also known as the Japanese Empire or Imperial Japan ,
6125-663: The Tsar Bomba of the USSR, which released an energy equivalent of over 50 megatons of TNT (210 PJ), was a three-stage weapon. Most thermonuclear weapons are considerably smaller than this, due to practical constraints from missile warhead space and weight requirements. In the early 1950s the Livermore Laboratory in the United States had plans for the testing of two massive bombs, Gnomon and Sundial , 1 gigaton of TNT and 10 gigatons of TNT respectively. Fusion reactions do not create fission products, and thus contribute far less to
6250-559: The United States against Japan at the end of World War II . On August 6, 1945, the United States Army Air Forces (USAAF) detonated a uranium gun-type fission bomb nicknamed " Little Boy " over the Japanese city of Hiroshima ; three days later, on August 9, the USAAF detonated a plutonium implosion-type fission bomb nicknamed " Fat Man " over the Japanese city of Nagasaki . These bombings caused injuries that resulted in
6375-533: The United States , the Soviet Union (succeeded as a nuclear power by Russia ), the United Kingdom , France , China , India , Pakistan , and North Korea . Israel is believed to possess nuclear weapons, though, in a policy of deliberate ambiguity , it does not acknowledge having them. Germany , Italy , Turkey , Belgium , the Netherlands , and Belarus are nuclear weapons sharing states. South Africa
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#17330859116216500-505: The bombardment of Shimonoseki by a multinational force in 1864. The Chōshū clan also launched the failed coup known as the Kinmon incident . The Satsuma-Chōshū alliance was established in 1866 to combine their efforts to overthrow the Tokugawa bakufu . In early 1867, Emperor Kōmei died of smallpox and was replaced by his son, Crown Prince Mutsuhito (Meiji) . On November 9, 1867, Tokugawa Yoshinobu resigned from his post and authorities to
6625-430: The gun-type design were developed . Armscor established a production line there in 1981 and produced at least one nuclear device of a 10-18 kilotons yield each year. Advena Central Laboratories were constructed in the mid-1980s to extend South Africa 's nuclear capabilities from gun-type weapons to inter-continental ballistic missile (ICBM) delivery platforms. Work to produce advanced warhead designs
6750-424: The hafnium controversy ) have been proposed as possible triggers for conventional thermonuclear reactions. Antimatter , which consists of particles resembling ordinary matter particles in most of their properties but having opposite electric charge , has been considered as a trigger mechanism for nuclear weapons. A major obstacle is the difficulty of producing antimatter in large enough quantities, and there
6875-599: The head of government or head of state . Despite controls and regulations governing nuclear weapons, there is an inherent danger of "accidents, mistakes, false alarms, blackmail, theft, and sabotage". In the late 1940s, lack of mutual trust prevented the United States and the Soviet Union from making progress on arms control agreements. The Russell–Einstein Manifesto was issued in London on July 9, 1955, by Bertrand Russell in
7000-436: The tropopause into the stratosphere , where the calm non-turbulent winds permit the debris to travel great distances from the burst, eventually settling and unpredictably contaminating areas far removed from the target of the explosion. There are other types of nuclear weapons as well. For example, a boosted fission weapon is a fission bomb that increases its explosive yield through a small number of fusion reactions, but it
7125-537: The "implosion" method, is more sophisticated and more efficient (smaller, less massive, and requiring less of the expensive fissile fuel) than the former. A major challenge in all nuclear weapon designs is to ensure that a significant fraction of the fuel is consumed before the weapon destroys itself. The amount of energy released by fission bombs can range from the equivalent of just under a ton to upwards of 500,000 tons (500 kilotons ) of TNT (4.2 to 2.1 × 10 GJ). All fission reactions generate fission products ,
7250-578: The 1980s (though not deployed in Europe) for use as tactical payloads for US Army artillery shells (200 mm W79 and 155 mm W82 ) and short range missile forces. Soviet authorities announced similar intentions for neutron warhead deployment in Europe; indeed, they claimed to have originally invented the neutron bomb, but their deployment on USSR tactical nuclear forces is unverifiable. A type of nuclear explosive most suitable for use by ground special forces
7375-555: The British commander. The force landed near Tianjin on July 5. On 17 June 1900, naval Rikusentai from the Kasagi and Atago had joined British, Russian, and German sailors to seize the Dagu forts near Tianjin. In light of the precarious situation, the British were compelled to ask Japan for additional reinforcements, as the Japanese had the only readily available forces in the region. Britain at
7500-754: The Chinese forces on the Liaodong Peninsula , and nearly destroyed the Chinese navy in the Battle of the Yalu River . The Treaty of Shimonoseki was signed between Japan and China, which ceded the Liaodong Peninsula and the island of Taiwan to Japan. After the peace treaty, Russia, Germany, and France forced Japan to withdraw from Liaodong Peninsula in the Triple Intervention . Soon afterward, Russia occupied
7625-425: The Cold War, policy and military theorists considered the sorts of policies that might prevent a nuclear attack, and they developed game theory models that could lead to stable deterrence conditions. Different forms of nuclear weapons delivery (see above) allow for different types of nuclear strategies. The goals of any strategy are generally to make it difficult for an enemy to launch a pre-emptive strike against
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#17330859116217750-654: The Daimyo and Shoguns. It was only due to the 1964 Summer Olympics in Japan that cheap concrete replicas of those castles were built for tourists. The vast majority of castles in Japan today are new replicas made out of concrete. In 1959 a concrete keep was built for Nagoya castle. During the Meiji restoration's Shinbutsu bunri , tens of thousands of Japanese Buddhist religious idols and temples were smashed and destroyed. Many statues still lie in ruins. Replica temples were rebuilt with concrete. Japan then closed and shut done tens of thousands of traditional old Shinto shrines in
7875-475: The Edo period, some new religious movements appeared, which were directly influenced by shamanism and Shinto . Emperor Ogimachi issued edicts to ban Catholicism in 1565 and 1568, but to little effect. Beginning in 1587 with imperial regent Toyotomi Hideyoshi's ban on Jesuit missionaries, Christianity was repressed as a threat to national unity. Under Hideyoshi and the succeeding Tokugawa shogunate, Catholic Christianity
8000-552: The Emperor and his Imperial House, and also against some major Shinto shrines which were believed to be tied strongly to the Emperor. The government strengthened its control over religious institutions that were considered to undermine State Shinto or nationalism. The majority of Japanese castles were smashed and destroyed in the late 19th century in the Meiji restoration by the Japanese people and government in order to modernize and westernize Japan and break from their past feudal era of
8125-614: The Heavens and with the Earth, We shall maintain and secure from decline the ancient form of government. ... In consideration of the progressive tendency of the course of human affairs and in parallel with the advance of civilization, We deem it expedient, in order to give clearness and distinctness to the instructions bequeathed by the Imperial Founder of Our House and by Our other Imperial Ancestors, to establish fundamental laws. ... Imperial Japan
8250-488: The Joint Chiefs of Staffs website Publication, "Integration of nuclear weapons employment with conventional and special operations forces is essential to the success of any mission or operation." Because they are weapons of mass destruction, the proliferation and possible use of nuclear weapons are important issues in international relations and diplomacy. In most countries, the use of nuclear force can only be authorized by
8375-623: The Korean government. When Korea demanded that Japan withdraw its troops from Korea, the Japanese refused. In early June 1894, the 8,000 Japanese troops captured the Korean king Gojong, occupied the Royal Palace in Seoul and, by June 25, installed a puppet government in Seoul. The new pro-Japanese Korean government granted Japan the right to expel Qing forces while Japan dispatched more troops to Korea. China objected and war ensued. Japanese ground troops routed
8500-732: The Liaodong Peninsula, built the Port Arthur fortress, and based the Russian Pacific Fleet in the port. Germany occupied Jiaozhou Bay , built Tsingtao fortress and based the German East Asia Squadron in this port. In 1900, Japan joined an international military coalition set up in response to the Boxer Rebellion in the Qing Empire of China. Japan provided the largest contingent of troops: 20,840, as well as 18 warships. Of
8625-421: The Meiji Restoration, the practices of the samurai classes, deemed feudal and unsuitable for modern times following the end of sakoku in 1853, resulted in a number of edicts intended to 'modernise' the appearance of upper class Japanese men. With the Dampatsurei Edict of 1871 issued by Emperor Meiji during the early Meiji Era, men of the samurai classes were forced to cut their hair short, effectively abandoning
8750-443: The Nuclear Age (1961) that mere possession of a nuclear arsenal was enough to ensure deterrence, and thus concluded that the spread of nuclear weapons could increase international stability . Some prominent neo-realist scholars, such as Kenneth Waltz and John Mearsheimer , have argued, along the lines of Gallois, that some forms of nuclear proliferation would decrease the likelihood of total war , especially in troubled regions of
8875-434: The Tokugawa army. A series of battles were then fought in pursuit of supporters of the Shogunate; Edo surrendered to the Imperial forces and afterward, Yoshinobu personally surrendered. Yoshinobu was stripped of all his power by Emperor Meiji and most of Japan accepted the emperor's rule. Pro-Tokugawa remnants retreated to northern Honshū ( Ōuetsu Reppan Dōmei ) and later to Ezo (present-day Hokkaidō ), where they established
9000-753: The USAF AIR-2 Genie , the AIM-26 Falcon and US Army Nike Hercules . Missile interceptors such as the Sprint and the Spartan also used small nuclear warheads (optimized to produce neutron or X-ray flux) but were for use against enemy strategic warheads. Other small, or tactical, nuclear weapons were deployed by naval forces for use primarily as antisubmarine weapons. These included nuclear depth bombs or nuclear armed torpedoes. Nuclear mines for use on land or at sea are also possibilities. The system used to deliver
9125-512: The United States. Small, two-man portable tactical weapons (somewhat misleadingly referred to as suitcase bombs ), such as the Special Atomic Demolition Munition , have been developed, although the difficulty of combining sufficient yield with portability limits their military utility. Nuclear warfare strategy is a set of policies that deal with preventing or fighting a nuclear war. The policy of trying to prevent an attack by
9250-562: The Western Allies and the Soviet Union , with the atomic bombings of Hiroshima and Nagasaki and the Soviet invasion of Manchuria . The Pacific War officially came to an end on 2 September 1945, leading to the beginning of the Allied occupation of Japan , during which United States military leader Douglas MacArthur administered the country. In 1947, through Allied efforts, a new Japan's constitution
9375-455: The atom, just as it does with fusion weapons. In fission weapons, a mass of fissile material ( enriched uranium or plutonium ) is forced into supercriticality —allowing an exponential growth of nuclear chain reactions —either by shooting one piece of sub-critical material into another (the "gun" method) or by compression of a sub-critical sphere or cylinder of fissile material using chemically fueled explosive lenses . The latter approach,
9500-540: The breakaway Republic of Ezo . An expeditionary force was dispatched by the new government and the Ezo Republic forces were overwhelmed. The siege of Hakodate came to an end in May 1869 and the remaining forces surrendered. The Charter Oath was made public at the enthronement of Emperor Meiji of Japan on April 7, 1868. The Oath outlined the main aims and the course of action to be followed during Emperor Meiji's reign, setting
9625-406: The cabinet demanded that there be guarantees from the British in return for the risks and costs of the major deployment of Japanese troops. On July 6, 1900, the 5th Infantry Division was alerted for possible deployment to China, but no timetable was set for this. Two days later, with more ground troops urgently needed to lift the siege of the foreign legations at Peking, the British ambassador offered
9750-620: The centuries-old Chinese suzerainty . On June 4, 1894, Korea requested aid from the Qing Empire in suppressing the Donghak Rebellion . The Qing government sent 2,800 troops to Korea. The Japanese countered by sending an 8,000-troop expeditionary force (the Oshima Composite Brigade) to Korea. The first 400 troops arrived on June 9 en route to Seoul , and 3,000 landed at Incheon on June 12. The Qing government turned down Japan's suggestion for Japan and China to cooperate to reform
9875-485: The chance of a successful missile defense . Today, missiles are most common among systems designed for delivery of nuclear weapons. Making a warhead small enough to fit onto a missile, though, can be difficult. Tactical weapons have involved the most variety of delivery types, including not only gravity bombs and missiles but also artillery shells, land mines , and nuclear depth charges and torpedoes for anti-submarine warfare . An atomic mortar has been tested by
10000-438: The chonmage ( chonmage ) hairstyle. During the early 20th century, the government was suspicious towards a number of unauthorized religious movements and periodically made attempts to suppress them. Government suppression was especially severe from the 1930s until the early 1940s, when the growth of Japanese nationalism and State Shinto were closely linked. Under the Meiji regime lèse majesté prohibited insults against
10125-672: The command of Captain Shimamura Hayao . The Japanese were able to contribute 52 men to the Seymour Expedition . On 12 June 1900, the advance of the Seymour Expedition was halted some 50 kilometres (30 mi) from the capital, by mixed Boxer and Chinese regular army forces. The vastly outnumbered allies withdrew to the vicinity of Tianjin , having suffered more than 300 casualties. The army general staff in Tokyo had become aware of
10250-503: The country was forced open to trade by the Convention of Kanagawa which came when Matthew C. Perry arrived in Japan in 1854. Thus, the period known as Bakumatsu began. The following years saw increased foreign trade and interaction; commercial treaties between the Tokugawa shogunate and Western countries were signed. In large part due to the humiliating terms of these unequal treaties ,
10375-562: The countryside, meant that abattoirs and workers were met with hostility from local residents. Continued ostracism as well as the decline in living standards led to former burakumin communities turning into slum areas. In the Blood tax riots , the Japanese Meiji government brutally put down revolts by Japanese samurai angry over the legal revocation of the traditional untouchable status of burakumin. The social tension continued to grow during
10500-435: The creation of nuclear fallout than fission reactions, but because all thermonuclear weapons contain at least one fission stage, and many high-yield thermonuclear devices have a final fission stage, thermonuclear weapons can generate at least as much nuclear fallout as fission-only weapons. Furthermore, high yield thermonuclear explosions (most dangerously ground bursts) have the force to lift radioactive debris upwards past
10625-587: The deaths of approximately 200,000 civilians and military personnel . The ethics of these bombings and their role in Japan's surrender are to this day, still subjects of debate . Since the atomic bombings of Hiroshima and Nagasaki , nuclear weapons have been detonated over 2,000 times for testing and demonstration. Only a few nations possess such weapons or are suspected of seeking them. The only countries known to have detonated nuclear weapons—and acknowledge possessing them—are (chronologically by date of first test)
10750-585: The decentralized American system with no central bank. In 1871, the New Currency Act of Meiji 4 (1871) abolished the local currencies and established the yen as the new decimal currency. It had parity with the Mexican silver dollar. The First Sino-Japanese War , fought in 1894 and 1895, revolved around the issue of control and influence over Korea under the rule of the Joseon dynasty . Korea had traditionally been
10875-450: The decision process. The prospect of mutually assured destruction might not deter an enemy who expects to die in the confrontation. Further, if the initial act is from a stateless terrorist instead of a sovereign nation, there might not be a nation or specific target to retaliate against. It has been argued, especially after the September 11, 2001, attacks , that this complication calls for
11000-437: The emperor, agreeing to "be the instrument for carrying out" imperial orders, leading to the end of the Tokugawa shogunate. However, while Yoshinobu's resignation had created a nominal void at the highest level of government, his apparatus of state continued to exist. Moreover, the shogunal government, the Tokugawa family in particular, remained a prominent force in the evolving political order and retained many executive powers,
11125-463: The energy of a fission bomb to compress and heat fusion fuel. In the Teller-Ulam design , which accounts for all multi-megaton yield hydrogen bombs, this is accomplished by placing a fission bomb and fusion fuel ( tritium , deuterium , or lithium deuteride ) in proximity within a special, radiation-reflecting container. When the fission bomb is detonated, gamma rays and X-rays emitted first compress
11250-470: The eventual loss of many of Japan's Oceanian island possessions in the following three years. Eventually, the American military captured Iwo Jima and Okinawa Island , leaving the Japanese mainland unprotected and without a significant naval defense force. By August 1945, plans had been made for an Allied invasion of mainland Japan , but were shelved after Japan surrendered in the face of a major breakthrough by
11375-458: The few great powers that determine the fate of the world. In the 1860s, Japan began to experience great social turmoil and rapid modernization. The feudal caste system in Japan formally ended in 1869 with the Meiji restoration . In 1871, the newly formed Meiji government issued a decree called Senmin Haishirei ( 賤民廃止令 Edict Abolishing Ignoble Classes ) giving burakumin equal legal status. It
11500-451: The fission bomb core. The external method of boosting enabled the USSR to field the first partially thermonuclear weapons, but it is now obsolete because it demands a spherical bomb geometry, which was adequate during the 1950s arms race when bomber aircraft were the only available delivery vehicles. The detonation of any nuclear weapon is accompanied by a blast of neutron radiation . Surrounding
11625-420: The fusion fuel, then heat it to thermonuclear temperatures. The ensuing fusion reaction creates enormous numbers of high-speed neutrons , which can then induce fission in materials not normally prone to it, such as depleted uranium . Each of these components is known as a "stage", with the fission bomb as the "primary" and the fusion capsule as the "secondary". In large, megaton-range hydrogen bombs, about half of
11750-520: The globe, would make all life on the planet extinct. In connection with the Strategic Defense Initiative , research into the nuclear pumped laser was conducted under the DOD program Project Excalibur but this did not result in a working weapon. The concept involves the tapping of the energy of an exploding nuclear bomb to power a single-shot laser that is directed at a distant target. During
11875-483: The immediate establishment of an elected national assembly , and the promulgation of a constitution. The constitution recognized the need for change and modernization after the removal of the shogunate : We, the Successor to the prosperous Throne of Our Predecessors, do humbly and solemnly swear to the Imperial Founder of Our House and to Our other Imperial Ancestors that, in pursuance of a great policy co-extensive with
12000-519: The legal stage for Japan's modernization. The Meiji leaders also aimed to boost morale and win financial support for the new government . Japan dispatched the Iwakura Mission in 1871. The mission traveled the world in order to renegotiate the unequal treaties with the United States and European countries that Japan had been forced into during the Tokugawa shogunate, and to gather information on western social and economic systems, in order to effect
12125-407: The midst of the Cold War. It highlighted the dangers posed by nuclear weapons and called for world leaders to seek peaceful resolutions to international conflict. The signatories included eleven pre-eminent intellectuals and scientists, including Albert Einstein , who signed it just days before his death on April 18, 1955. A few days after the release, philanthropist Cyrus S. Eaton offered to sponsor
12250-536: The military establishment have questioned the usefulness of such weapons in the current military climate. According to an advisory opinion issued by the International Court of Justice in 1996, the use of (or threat of use of) such weapons would generally be contrary to the rules of international law applicable in armed conflict, but the court did not reach an opinion as to whether or not the threat or use would be lawful in specific extreme circumstances such as if
12375-408: The missiles before they land or implementing civil defense measures using early-warning systems to evacuate citizens to safe areas before an attack. Weapons designed to threaten large populations or to deter attacks are known as strategic weapons . Nuclear weapons for use on a battlefield in military situations are called tactical weapons . Critics of nuclear war strategy often suggest that
12500-561: The modernization of Japan. Renegotiation of the unequal treaties was universally unsuccessful, but close observation of the American and European systems inspired members on their return to bring about modernization initiatives in Japan. Japan made a territorial delimitation treaty with Russia in 1875, gaining all the Kuril islands in exchange for Sakhalin island . The Japanese government sent observers to Western countries to observe and learn their practices, and also paid " foreign advisors " in
12625-598: The murder of an Englishman, Charles Lennox Richardson , by a party of samurai from Satsuma . The British demanded reparations but were denied. While attempting to exact payment, the Royal Navy was fired on from coastal batteries near the town of Kagoshima . They responded by bombarding the port of Kagoshima in 1863. The Tokugawa government agreed to pay an indemnity for Richardson's death. Shelling of foreign shipping in Shimonoseki and attacks against foreign property led to
12750-428: The remains of the split atomic nuclei. Many fission products are either highly radioactive (but short-lived) or moderately radioactive (but long-lived), and as such, they are a serious form of radioactive contamination . Fission products are the principal radioactive component of nuclear fallout . Another source of radioactivity is the burst of free neutrons produced by the weapon. When they collide with other nuclei in
12875-576: The rest of the Axis powers , the formalized Japanese Instrument of Surrender was issued on 2 September 1945 in compliance with the Potsdam Declaration of the Allies , and the empire's territory subsequently shrunk to cover only the Japanese archipelago resembling modern Japan. Under the slogans of fukoku kyōhei and shokusan kōgyō , which followed the Boshin War and the restoration of power to
13000-475: The samurai class, which was abolished together with the caste system. This would later bring the Meiji government into conflict with the samurai . Several writers, under the constant threat of assassination from their political foes, were influential in winning Japanese support for westernization . One such writer was Fukuzawa Yukichi , whose works included "Conditions in the West", " Leaving Asia ", and "An Outline of
13125-450: The shogunate soon faced internal hostility, which materialized into a radical, xenophobic movement, the sonnō jōi (literally "Revere the Emperor, expel the barbarians"). In March 1863, the Emperor issued the " order to expel barbarians ." Although the shogunate had no intention of enforcing the order, it nevertheless inspired attacks against the shogunate itself and against foreigners in Japan. The Namamugi Incident during 1862 led to
13250-402: The surrounding material, the neutrons transmute those nuclei into other isotopes, altering their stability and making them radioactive. The most commonly used fissile materials for nuclear weapons applications have been uranium-235 and plutonium-239 . Less commonly used has been uranium-233 . Neptunium-237 and some isotopes of americium may be usable for nuclear explosives as well, but it
13375-498: The survival of the state were at stake. Another deterrence position is that nuclear proliferation can be desirable. In this case, it is argued that, unlike conventional weapons, nuclear weapons deter all-out war between states, and they succeeded in doing this during the Cold War between the U.S. and the Soviet Union . In the late 1950s and early 1960s, Gen. Pierre Marie Gallois of France, an adviser to Charles de Gaulle , argued in books like The Balance of Terror: Strategy for
13500-608: The time was heavily engaged in the Boer War , so a large part of the British army was tied down in South Africa. Further, deploying large numbers of troops from its garrisons in India would take too much time and weaken internal security there. Overriding personal doubts, Foreign Minister Aoki Shūzō calculated that the advantages of participating in an allied coalition were too attractive to ignore. Prime Minister Yamagata agreed, but others in
13625-569: The total, 20,300 were Imperial Japanese Army troops of the 5th Infantry Division under Lt. General Yamaguchi Motoomi; the remainder were 540 naval rikusentai (marines) from the Imperial Japanese Navy . At the beginning of the Boxer Rebellion the Japanese only had 215 troops in northern China stationed at Tientsin; nearly all of them were naval rikusentai from the Kasagi and the Atago , under
13750-522: The two-hundred-year-old Tokugawa shogunate. Tokugawa Yoshinobu launched a military campaign to seize the emperor's court in Kyoto. However, the tide rapidly turned in favor of the smaller but relatively modernized imperial faction and resulted in defections of many daimyōs to the Imperial side. The Battle of Toba–Fushimi was a decisive victory in which a combined army from Chōshū, Tosa, and Satsuma domains defeated
13875-446: The weapon system and difficult to defend against the delivery of the weapon during a potential conflict. This can mean keeping weapon locations hidden, such as deploying them on submarines or land mobile transporter erector launchers whose locations are difficult to track, or it can mean protecting weapons by burying them in hardened missile silo bunkers. Other components of nuclear strategies included using missile defenses to destroy
14000-631: The world where there exists a single nuclear-weapon state. Aside from the public opinion that opposes proliferation in any form, there are two schools of thought on the matter: those, like Mearsheimer, who favored selective proliferation, and Waltz, who was somewhat more non- interventionist . Interest in proliferation and the stability-instability paradox that it generates continues to this day, with ongoing debate about indigenous Japanese and South Korean nuclear deterrent against North Korea . The threat of potentially suicidal terrorists possessing nuclear weapons (a form of nuclear terrorism ) complicates
14125-588: The worsening conditions in China and had drafted ambitious contingency plans, but in the wake of the Triple Intervention five years before, the government refused to deploy large numbers of troops unless requested by the western powers. However three days later, a provisional force of 1,300 troops commanded by Major General Fukushima Yasumasa was to be deployed to northern China. Fukushima was chosen because he spoke fluent English which enabled him to communicate with
14250-624: The yield comes from the final fissioning of depleted uranium. Virtually all thermonuclear weapons deployed today use the "two-stage" design described to the right, but it is possible to add additional fusion stages—each stage igniting a larger amount of fusion fuel in the next stage. This technique can be used to construct thermonuclear weapons of arbitrarily large yield. This is in contrast to fission bombs, which are limited in their explosive power due to criticality danger (premature nuclear chain reaction caused by too-large amounts of pre-assembled fissile fuel). The largest nuclear weapon ever detonated,
14375-539: Was also developed. Working with Israel at Advena, a 2000 km-range missile – based on the Jericho II ICBM – was designed and tested. The construction of Advena was completed at the same time as South Africa 's nuclear program was terminated in the lead-up to Nelson Mandela 's election in 1994 . 25°45′03″S 28°01′44″E / 25.75083°S 28.02889°E / -25.75083; 28.02889 This South African military article
14500-456: Was among the first Protestant literature in Japan. In 1865, McCartee moved back to Ningbo , China, but others have followed in his footsteps. There was a burst of growth of Christianity in the late 19th century when Japan re-opened its doors to the West. Protestant church growth slowed dramatically in the early 20th century under the influence of the military government during the Shōwa period . Under
14625-424: Was characterized by rapid industrialization , the development of a capitalist economy , and the transformation of many feudal workers to wage labour . The use of strike action also increased, and 1897, with the establishment of a union for metalworkers, the foundations of the modern Japanese trade-union movement were formed. Samurai were allowed to work in any occupation they wanted. Admission to universities
14750-422: Was determined based on examination results. The government also recruited more than 3,000 Westerners to teach modern science, mathematics, technology, and foreign languages in Japan ( O-yatoi gaikokujin ). Despite this, social mobility was still low due to samurai and their descendants being overrepresented in the new elite class. After sending observers to the United States, the Empire of Japan initially copied
14875-735: Was enacted, officially ending the Japanese Empire and forming modern Japan . During this time, the Imperial Japanese Armed Forces were dissolved. It was later replaced by the current Japan Self-Defense Forces in 1954. Reconstruction under the Allied occupation continued until 1952, consolidating the modern Japanese constitutional monarchy . In total, the Empire of Japan had three emperors: Meiji , Taishō , and Shōwa . The Imperial era came to an end partway through Shōwa's reign , and he remained emperor until 1989. The historical state
15000-682: Was founded, de jure , after the 1889 signing of Constitution of the Empire of Japan. The constitution formalized much of the Empire's political structure and gave many responsibilities and powers to the Emperor. In 1890, the Imperial Diet was established in response to the Meiji Constitution. The Diet consisted of the House of Representatives of Japan and the House of Peers . Both houses opened seats for colonial people as well as Japanese. The Imperial Diet continued until 1947. Economic development
15125-510: Was prompted by his learning of a series of arson attacks in Edo, starting with the burning of the outworks of Edo Castle , the main Tokugawa residence. The Boshin War ( 戊辰戦争 , Boshin Sensō ) was fought between January 1868 and May 1869. The alliance of samurai from southern and western domains and court officials had now secured the cooperation of the young Emperor Meiji, who ordered the dissolution of
15250-415: Was repressed and adherents were persecuted. After the Tokugawa shogunate banned Christianity in 1620, it ceased to exist publicly. Many Catholics went underground, becoming hidden Christians ( 隠れキリシタン , kakure kirishitan ) , while others lost their lives. After Japan was opened to foreign powers in 1853, many Christian clergymen were sent from Catholic, Protestant, and Orthodox churches, though proselytism
15375-491: Was still banned. Only after the Meiji Restoration, was Christianity re-established in Japan. Freedom of religion was introduced in 1871, giving all Christian communities the right to legal existence and preaching. Eastern Orthodoxy was brought to Japan in the 19th century by St. Nicholas (baptized as Ivan Dmitrievich Kasatkin), who was sent in 1861 by the Russian Orthodox Church to Hakodate , Hokkaidō as priest to
15500-744: Was the Special Atomic Demolition Munition , or SADM, sometimes popularly known as a suitcase nuke . This is a nuclear bomb that is man-portable, or at least truck-portable, and though of a relatively small yield (one or two kilotons) is sufficient to destroy important tactical targets such as bridges, dams, tunnels, important military or commercial installations, etc. either behind enemy lines or pre-emptively on friendly territory soon to be overtaken by invading enemy forces. These weapons require plutonium fuel and are particularly "dirty". They also demand especially stringent security precautions in their storage and deployment. Small "tactical" nuclear weapons were deployed for use as antiaircraft weapons. Examples include
15625-676: Was the Japanese nation-state that existed from the Meiji Restoration on 3 January 1868 until the Constitution of Japan took effect on 3 May 1947. From 1910 to 1945 , it included the Japanese archipelago , the Kurils , Karafuto , Korea , and Taiwan . Concessions such as the Kwantung Leased Territory were de jure not parts of the empire but dependent territories. In the closing stages of World War II , with Japan defeated alongside
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