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Wooden Box Mine
The PMD-6, PMD-7 and PMD-57 series mines are Soviet Union blast-type anti-personnel mines that consist of a wooden box with a hinged lid with a slot cut into it. The slot presses down against a retaining pin, which holds back the striker. When sufficient pressure is applied to the lid of the box the retaining pin moves, allowing the striker to hit the detonator. The mines typically have an operating pressure of 1 to 10 kg. All the mines in the series use Metal Oxide Varistor series fuzes. As with other wooden box mines, the mine has a relatively short lifetime since the box is vulnerable to rotting and splitting, disabling the mine. The mines are sometimes used with mortar bombs in place of the normal explosive blocks. Variants * PMD-6 - original version of the mine, first used in the 1939 Winter War between the Soviet Union and Finland. * PMD-6M - slightly larger version of the mine, with a leaf spring installed inside the box to increase operating pressure, which allows ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soviet Union
The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a Federation, federal union of Republics of the Soviet Union, fifteen national republics; in practice, both Government of the Soviet Union, its government and Economy of the Soviet Union, its economy were highly Soviet-type economic planning, centralized until its final years. It was a one-party state governed by the Communist Party of the Soviet Union, with the city of Moscow serving as its capital as well as that of its largest and most populous republic: the Russian Soviet Federative Socialist Republic, Russian SFSR. Other major cities included Saint Petersburg, Leningrad (Russian SFSR), Kyiv, Kiev (Ukrainian Soviet Socialist Republic, Ukrainian SSR), Minsk (Byelorussian Soviet Socialist Republic, Byelorussian SSR), Tas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anti-personnel Mine
Anti-personnel mines are a form of mine designed for use against humans, as opposed to anti-tank mines, which are designed for use against vehicles. Anti-personnel mines may be classified into blast mines or fragmentation mines; the latter may or may not be a bounding mine. The mines are often designed to injure, not kill, their victims to increase the logistical (mostly medical) support required by enemy forces that encounter them. Some types of anti-personnel mines can also damage the tracks on armoured vehicles or the tires of wheeled vehicles. The International Campaign to Ban Landmines has sought to ban mines culminating in the 1997 Ottawa Treaty, although this treaty has not yet been accepted by over 30 countries. Use Anti-personnel mines are used in a similar manner to anti-tank mines, in static "mine fields" along national borders or in defense of strategic positions as described in greater detail in the land mine article. What makes them different from most anti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Detonator
A detonator, frequently a blasting cap, is a device used to trigger an explosive device. Detonators can be chemically, mechanically, or electrically initiated, the last two being the most common. The commercial use of explosives uses electrical detonators or the capped fuse which is a length of safety fuse to which an ordinary detonator has been joined. Many detonators' primary explosive is a material called ASA compound. This compound is formed from lead azide, lead styphnate and aluminium and is pressed into place above the base charge, usually TNT or tetryl in military detonators and PETN in commercial detonators. Other materials such as DDNP (diazo dinitro phenol) are also used as the primary charge to reduce the amount of lead emitted into the atmosphere by mining and quarrying operations. Old detonators used mercury fulminate as the primary, often mixed with potassium chlorate to yield better performance. A blasting cap is a small sensitive primary explosive dev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Varistor
A varistor is an electronic component with an electrical resistance that varies with the applied voltage. Also known as a voltage-dependent resistor (VDR), it has a nonlinear, non- ohmic current–voltage characteristic that is similar to that of a diode. Unlike a diode however, it has the same characteristic for both directions of traversing current. Traditionally, varistors were indeed constructed by connecting two rectifiers, such as the copper-oxide or germanium-oxide rectifier in antiparallel configuration. At low voltage the varistor has a high electrical resistance which decreases as the voltage is raised. Modern varistors are primarily based on sintered ceramic metal-oxide materials which exhibit directional behavior only on a microscopic scale. This type is commonly known as the metal-oxide varistor (MOV). Varistors are used as control or compensation elements in circuits either to provide optimal operating conditions or to protect against excessive transient voltages ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Winter War
The Winter War,, sv, Vinterkriget, rus, Зи́мняя война́, r=Zimnyaya voyna. The names Soviet–Finnish War 1939–1940 (russian: link=no, Сове́тско-финская война́ 1939–1940) and Soviet–Finland War 1939–1940 (russian: link=no, Сове́тско-финляндская война́ 1939–1940) are often used in Russian historiographybr>В.Н. Барышников. От прохладного мира к Зимней войне. Восточная политика Финляндии в 1930–е годы. Санкт-Петербург, 1997.; О.Д. Дудорова. Неизвестные страницы Зимней войны. In: Военно-исторический журнал. 1991. №9.; Зимняя война 1939–1940. Книга первая. Политическая история. М., 1998. – ; ttp://www.otvaga2004.narod.ru/photo/winterwar/wwar1.htm М. Коломиец. Танки в Зимней войне 19 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siege Of Leningrad
The siege of Leningrad (russian: links=no, translit=Blokada Leningrada, Блокада Ленинграда; german: links=no, Leningrader Blockade; ) was a prolonged military blockade undertaken by the Axis powers against the Soviet city of Leningrad (present-day Saint Petersburg) on the Eastern Front of World War II. Germany's Army Group North advanced from the south, while the German-allied Finnish army invaded from the north and completed the ring around the city. The siege began on 8 September 1941, when the Wehrmacht severed the last road to the city. Although Soviet forces managed to open a narrow land corridor to the city on 18 January 1943, the Red Army did not lift the siege until 27 January 1944, 872 days after it began. The blockade became one of the longest and most destructive sieges in history, and it was possibly the costliest siege in history due to the number of casualties which were suffered throughout its duration. While not classed as a war crime at t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ANFO
ANFO ( ) (or AN/FO, for ammonium nitrate/fuel oil) is a widely used bulk industrial explosive. It consists of 94% porous prilled ammonium nitrate (NH4NO3) (AN), which acts as the oxidizing agent and absorbent for the fuel, and 6% number 2 fuel oil (FO). The use of ANFO originated in the 1950s. ANFO accounts for an estimated 90% of the of explosives used annually in North America. It has found wide use in coal mining, quarrying, metal mining, and civil construction in applications where its low cost and ease of use may outweigh the benefits of other explosives, such as water resistance, oxygen balance, higher detonation velocity, or performance in small-diameter columns. ANFO is also widely used in avalanche hazard mitigation. Chemistry The chemistry of ANFO detonation is the reaction of ammonium nitrate with a long-chain alkane (CnH2n+2) to form nitrogen, carbon dioxide, and water. In an ideal stoichiometrically balanced reaction, ANFO is composed of about 94.5% AN and 5. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Schu-mine 42
The Schü-mine 42 (''Schützenmine 42'', "rifleman's mine model of 1942"), was a German anti-personnel mine used during the Second World War. It consisted of a simple wooden box with a hinged lid containing a block of cast TNT and a ZZ-42 type detonator. A slot in the lid pressed down on the striker retaining pin, sufficient pressure on the lid caused the pin to move, releasing the striker which triggered the detonator. The mine was cheap to produce and deployed in large numbers. As an early example of a minimum metal mine, it was difficult to detect with early metal detectors - the only metal present was a small amount in the mine's detonator. Experience has shown that the mine detector search coil must pass very close to the mine before any reaction is obtained. Detection is still more difficult when the search is made in ground containing shrapnel. Also it is hard to locate the Schü mine by observation or probing because it is relatively small. During the Normandy Campaign ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PP Mi-D Mine
The PP Mi-D mine is a Czechoslovakian copy of the German Second World War Schu-mine 42 anti-personnel mine. It consists of a simple wooden box with a hinged lid that acts as the trigger mechanism. A slot is cut into the side of the lid which rests on the striker retaining pin. The main charge is a block of cast TNT into which a variety of fuzes may be placed, typically either the RO-1 or an MUV series fuze. The mine is triggered by pressure on the lid forcing the retaining pin out of the striker which then hits the detonator. It can be used with a tripwire connected to the fuze acting as a crude anti-handling device. There are also sometimes two holes drilled in the front of the box that accept wooden pins, either to prevent accidental detonation when laying or to increase the operating pressure. The wooden construction of the mine results in a short field life, with the box rotting or splitting preventing the mine from functioning. Specifications * Height: ** With fuze: 72&n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Type 59 Mine
Type may refer to: Science and technology Computing * Typing, producing text via a keyboard, typewriter, etc. * Data type, collection of values used for computations. * File type * TYPE (DOS command), a command to display contents of a file. * Type (Unix), a command in POSIX shells that gives information about commands. * Type safety, the extent to which a programming language discourages or prevents type errors. * Type system, defines a programming language's response to data types. Mathematics * Type (model theory) * Type theory, basis for the study of type systems * Arity or type, the number of operands a function takes * Type, any proposition or set in the intuitionistic type theory * Type, of an entire function ** Exponential type Biology * Type (biology), which fixes a scientific name to a taxon * Dog type, categorization by use or function of domestic dogs Lettering * Type is a design concept for lettering used in typography which helped bring about modern textual print ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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