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Pumpkin Bomb
Pumpkin bombs were conventional aerial bombs developed by the Manhattan Project and used by the United States Army Air Forces against Japan during World War II. Its physical characteristics closely replicated those of the Fat Man plutonium bomb, with the same ballistic and handling characteristics, but it used non-nuclear conventional high explosives. It was mainly used for testing and training purposes, which included combat missions flown with pumpkin bombs by the 509th Composite Group. The name "pumpkin bomb" was the term used in official documents from the large, fat ellipsoidal shape of the munition casing instead of the more usual cylindrical shape of other bombs, required to enclose the Fat Man's spherical "physics package" (the plutonium implosion nuclear weapon core). Development Pumpkin bombs were a means of providing realistic training with non-nuclear bombs for the 509th Composite Group's Boeing B-29 Superfortress crews assigned to drop the atomic bomb. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pumpkin Bomb (comics)
The Green Goblin is the alias of several supervillains appearing in American comic books published by Marvel Comics. Created by writer Stan Lee and artist Steve Ditko, the first and best-known incarnation of the Green Goblin is Norman Osborn, who is regarded as one of the superhero Spider-Man's three archenemies, alongside Doctor Octopus and Venom. Originally a manifestation of chemically induced insanity, others would later take on the persona, including Norman's son Harry Osborn. The Green Goblin is depicted as a criminal mastermind who uses an arsenal of Halloween-themed equipment, including grenade-like Pumpkin Bombs, razor-sharp bat-shaped blades, and a flying Goblin Glider, to terrorize New York City. Comics journalist and historian Mike Conroy writes of the character: "Of all the costumed villains who've plagued Spider-Man over the years, the most flat-out unhinged and terrifying of them all is the Green Goblin." The Green Goblin has appeared in numerous media adaptati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Captain (United States O-6)
In the United States Navy, United States Coast Guard, United States Public Health Service Commissioned Corps (USPHS Corps), and National Oceanic and Atmospheric Administration Commissioned Officer Corps (NOAA Corps), captain is the senior-most commissioned officer rank below that of flag officer (i.e., admirals). The equivalent rank is colonel in the United States Army, Air Force, Space Force, and Marine Corps. Reflecting its nautical heritage, the term '' captain'' is used as a military title by officers of more junior rank who command a commissioned vessel of the Navy, Coast Guard, or National Oceanic and Atmospheric Administration (NOAA) of patrol boat size or greater. Officers below O-6 who command aviation squadrons (typically O-5 commanders) usually use the less formal title "skipper". Insignia File:US-O6 insignia.svg, USN, USCG, USPHSCC, and NOAACOC collar, cover (hat), or shoulder rank insignia (on select uniforms) File:US Navy O6 insignia.svg, The eagle, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Naval Surface Warfare Center Dahlgren Division
The United States Naval Surface Warfare Center Dahlgren Division (NSWCDD), named for Rear Admiral John A. Dahlgren, is located in King George County, Virginia, in close proximity to the largest fleet concentration area in the Navy. NSWCDD is part of the Naval Surface Warfare Centers under the Naval Sea Systems Command (NAVSEA). NSWCDD was initially established 16 October 1918 as a remote extension of Maryland's Indian Head Proving Ground used for testing naval guns. The Dahlgren site was named the Lower Station, Dahlgren Naval Proving Ground when it first opened. The location on the Potomac River was specifically chosen for the development of a long ballistic test range on the Potomac River, required for the testing of modern, high-powered munitions.navy.mil The NSWCDD employs approximately ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Proximity Fuze
A Proximity Fuse (also VT fuse or "variable time fuze") is a fuse that detonates an explosive device automatically when it approaches within a certain distance of its target. Proximity fuses are designed for elusive military targets such as aircraft and missiles, as well as ships at sea and ground forces. This sophisticated trigger mechanism may increase lethality by 5 to 10 times compared to the common contact fuse or timed fuse. Background Before the invention of the proximity fuze, detonation was induced by direct contact, a timer set at launch, or an altimeter. All of these earlier methods have disadvantages. The probability of a direct hit on a small moving target is low; a shell that just misses the target will not explode. A time- or height-triggered fuze requires good prediction by the gunner and accurate timing by the fuze. If either is wrong, then even accurately aimed shells may explode harmlessly before reaching the target or after passing it. At the start of the Bl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zinc Chromate
Zinc chromate, Zn Cr O4, is a chemical compound, a salt containing the chromate anion, appearing as odorless yellow powder or yellow-green crystals, but, when used for coatings, pigments are often added. It is used industrially in chromate conversion coatings, having been developed by the Ford Motor Company Ford Motor Company (commonly known as Ford) is an American multinational corporation, multinational automobile manufacturer headquartered in Dearborn, Michigan, United States. It was founded by Henry Ford and incorporated on June 16, 1903. T ... in the 1920s. Production A process known as the Cronak process is used to create zinc chromate for use in industry. This process is done by putting zinc or a zinc plated metal in a solution of sodium dichromate and sulfuric acid for a few seconds. Zinc chromate can also be synthesized by using neutral potassium chromate (K2CrO4) and zinc sulfate (ZnSO4), which forms a precipitate. K2CrO4 + ZnSO4 → ZnCrO4 + K2SO4 File:Zi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tinian
Tinian () is one of the three principal islands of the Commonwealth of the Northern Mariana Islands (CNMI). Together with uninhabited neighboring Aguiguan, it forms Tinian Municipality, one of the four constituent municipalities of the Northern Marianas. Tinian's largest village is San Jose. Tinian is just south of the Northern Marianas' most inhabited island, Saipan, but north of the populated Rota to the south. The island has many World War II historical sites, cattle ranches, and beaches. There was a 5-star casino that operated from 1998 to 2015; the remaining are other hotels/resorts and a golf course. The main Saipan access is a short airplane ride from the international airport or a charter boat. Tinian is part of the United States and the CNMI. Along with Guam, it is the westernmost U.S. island in the Pacific. History First settlers The Mariana Islands, of which Tinian is one, were the first islands settled by humans in Remote Oceania. It was also the first and t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pumpkin (color)
In optics, orange has a wavelength between approximately 585 and 620 nm and a hue of 30° in HSV color space. In the RGB color space it is a secondary color numerically halfway between gamma-compressed red and yellow, as can be seen in the RGB color wheel. The complementary color of orange is azure. Orange pigments are largely in the ochre or cadmium families, and absorb mostly blue light. Varieties of the color orange may differ in hue, chroma (also called saturation, intensity, or colorfulness) or lightness (or value, tone, or brightness), or in two or three of these qualities. Variations in value are also called tints and shades, a tint being an orange or other hue mixed with white, a shade being mixed with black. A large selection of these various colors is shown below. Orange (color wheel) The color known as ''color wheel orange'' is the tone of orange that is a pure chroma on the HSV color wheel, the expression of which is known as the RGB color wheel, exactly ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ellipsoid
An ellipsoid is a surface that can be obtained from a sphere by deforming it by means of directional Scaling (geometry), scalings, or more generally, of an affine transformation. An ellipsoid is a quadric surface; that is, a Surface (mathematics), surface that may be defined as the zero set of a polynomial of degree two in three variables. Among quadric surfaces, an ellipsoid is characterized by either of the two following properties. Every planar Cross section (geometry), cross section is either an ellipse, or is empty, or is reduced to a single point (this explains the name, meaning "ellipse-like"). It is Bounded set, bounded, which means that it may be enclosed in a sufficiently large sphere. An ellipsoid has three pairwise perpendicular Rotational symmetry, axes of symmetry which intersect at a Central symmetry, center of symmetry, called the center of the ellipsoid. The line segments that are delimited on the axes of symmetry by the ellipsoid are called the ''principal ax ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
California Institute Of Technology
The California Institute of Technology (branded as Caltech) is a private research university in Pasadena, California, United States. The university is responsible for many modern scientific advancements and is among a small group of institutes of technology in the United States that are devoted to the instruction of pure and applied sciences. The institution was founded as a preparatory and vocational school by Amos G. Throop in 1891 and began attracting influential scientists such as George Ellery Hale, Arthur Amos Noyes, and Robert Andrews Millikan in the early 20th century. The vocational and preparatory schools were disbanded and spun off in 1910, and the college assumed its present name in 1920. In 1934, Caltech was elected to the Association of American Universities, and the antecedents of NASA's Jet Propulsion Laboratory, which Caltech continues to manage and operate, were established between 1936 and 1943 under Theodore von Kármán. Caltech has six academic divisi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charles Christian Lauritsen
Charles Christian Lauritsen (April 4, 1892 – April 13, 1968) was a Danish-American physicist. Early life and career Lauritsen was born in Holstebro, Denmark and studied architecture at the Odense Tekniske Skole, graduating in 1911. In 1916 he emigrated to the United States with his wife Sigrid Henriksen and son Tommy, first to Florida, where the family lived for a time on a houseboat, and later to Boston, where he worked as a draftsman during the Great War and was a witness to the Boston Molasses Disaster. By 1921, he was working in Palo Alto on radio for communicating between ship and shore. He became interested in the design of radio receivers, and for a few months in 1922 was in business with two partners building radios. By 1923, he had moved to St. Louis where he was chief engineer at the Kennedy Corporation, a producer of consumer radio receivers. In 1926, Lauritsen attended a public lecture by Robert Millikan who, in casual conversation afterwards, invited him t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paul W
Paul may refer to: People * Paul (given name), a given name, including a list of people * Paul (surname), a list of people * Paul the Apostle, an apostle who wrote many of the books of the New Testament * Ray Hildebrand, half of the singing duo Paul & Paula * Paul Stookey, one-third of the folk music trio Peter, Paul and Mary * Billy Paul, stage name of American soul singer Paul Williams (1934–2016) * Vinnie Paul, drummer for American Metal band Pantera * Paul Avril, pseudonym of Édouard-Henri Avril (1849–1928), French painter and commercial artist * Paul, pen name under which Walter Scott wrote ''Paul's letters to his Kinsfolk'' in 1816 * Jean Paul, pen name of Johann Paul Friedrich Richter (1763–1825), German Romantic writer Places * Paul, Cornwall, a village in the civil parish of Penzance, United Kingdom * Paul (civil parish), Cornwall, United Kingdom * Paul, Alabama, United States, an unincorporated community * Paul, Idaho, United States, a city * Paul, Nebrask ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lieutenant Colonel (United States)
In the United States Army, United States Marine Corps, Marine Corps, United States Air Force, Air Force and United States Space Force, Space Force, lieutenant colonel is a senior officer rank, just above the rank of Major (United States), major and just below the rank of Colonel (United States), colonel. It is equivalent to the naval rank of Commander (United States), commander in the other Uniformed services of the United States, uniformed services. The U.S. uniformed services pay grades, pay grade for the rank of lieutenant colonel is O-5. In the United States armed forces, the insignia for the rank is a silver oak leaf, with slight stylized differences between the version of the Army and the Air Force and that of the Navy and the Marine Corps. Promotion to lieutenant colonel is governed by Department of Defense policies derived from the Defense Officer Personnel Management Act (DOPMA) of 1980, for officers in the Active Component, and its companion Reserve Officer Personn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
