Lamar County is a county located in the U.S. state of Mississippi. As of the 2020 census, the population was 64,222. Its county seat is Purvis. Named for Confederate Lucius Quintus Cincinnatus Lamar, the county was carved out of Marion County to the west in 1904.
Purvis is a U.S. city in and the county seat of Lamar County, Mississippi. It is part of the Hattiesburg, Mississippi Metropolitan Statistical Area. The population was 2,175 at the 2010 census. The Town of Purvis was incorporated on February 25, 1888 and was founded by and named after Thomas Melville Purves, originally of Marion County, Alabama. Purves, born March 8, 1820, was a second generation Scottish-American; his grandfather emigrated to Charleston, South Carolina in 1765.
West Hattiesburg is an unincorporated area and census-designated place (CDP) in Lamar County, Mississippi, west of the city of Hattiesburg and east of the community of Oak Grove. It is part of the Hattiesburg metropolitan area. It had a decline in population from 6,305 at the 2000 census to 5,909 at the 2010 census.
Hattiesburg is the 5th most populous city in the U.S. state of Mississippi, located primarily in Forrest County and extending west into Lamar County. The city population was 45,989 at the 2010 census, with the population now being 48,730 in 2020. Hattiesburg is the principal city of the Hattiesburg Metropolitan Statistical Area, which encompasses Covington, Forrest, Lamar, and Perry counties. The city is the anchor of the Pine Belt region.
Project Plowshare was the overall United States program for the development of techniques to use nuclear explosives for peaceful construction purposes. The program was organized in June 1957 as part of the worldwide Atoms for Peace efforts. As part of the program, 35 nuclear warheads were detonated in 27 separate tests. A similar program was carried out in the Soviet Union under the name Nuclear Explosions for the National Economy, although the Soviet one consists of 124 tests.
Nuclear weapons tests are experiments carried out to determine the performance, yield, and effects of nuclear weapons. Such tests have resulted until 2020 in up to 2.4 million people dying from its global fallout. Testing nuclear weapons offers practical information about how the weapons function, how detonations are affected by different conditions, and how personnel, structures, and equipment are affected when subjected to nuclear explosions. However, nuclear testing has often been used as an indicator of scientific and military strength. Many tests have been overtly political in their intention; most nuclear weapons states publicly declared their nuclear status through a nuclear test.
Amchitka is a volcanic, tectonically unstable and uninhabited island in the Rat Islands group of the Aleutian Islands in southwest Alaska. It is part of the Alaska Maritime National Wildlife Refuge. The island, with a land area of roughly 116 square miles (300 km2), is about 42 miles (68 km) long and 1 to 4 miles wide. The area has a maritime climate, with many storms, and mostly overcast skies.
Project PACER, carried out at Los Alamos National Laboratory (LANL) in the mid-1970s, explored the possibility of a fusion power system that would involve exploding small hydrogen bombs —or, as stated in a later proposal, fission bombs—inside an underground cavity. Its proponents claimed that the system is the only fusion power system that could be demonstrated to work using existing technology. It would also require a continuous supply of nuclear explosives and contemporary economics studies demonstrated that these could not be produced at a competitive price compared to conventional energy sources.
Operation Hardtack I was a series of 35 nuclear tests conducted by the United States from April 28 to August 18 in 1958 at the Pacific Proving Grounds. At the time of testing, the Operation Hardtack I test series included more nuclear detonations than the total of prior nuclear explosions in the Pacific Ocean. These tests followed the Project 58/58A series, which occurred from 1957 December 6 to 1958, March 14, and preceded the Operation Argus series, which took place in 1958 from August 27 to September 6.
Peaceful nuclear explosions (PNEs) are nuclear explosions conducted for non-military purposes. Proposed uses include excavation for the building of canals and harbours, electrical generation, the use of nuclear explosions to drive spacecraft, and as a form of wide-area fracking. PNEs were an area of some research from the late 1950s into the 1980s, primarily in the United States and Soviet Union.
The explosive yield of a nuclear weapon is the amount of energy released such as blast, thermal, and nuclear radiation, when that particular nuclear weapon is detonated, usually expressed as a TNT equivalent (the standardized equivalent mass of trinitrotoluene which, if detonated, would produce the same energy discharge), either in kilotonnes (kt—thousands of tonnes of TNT), in megatonnes (Mt—millions of tonnes of TNT), or sometimes in terajoules (TJ). An explosive yield of one terajoule is equal to 0.239 kilotonnes of TNT. Because the accuracy of any measurement of the energy released by TNT has always been problematic, the conventional definition is that one kilotonne of TNT is held simply to be equivalent to 1012 calories.
Oak Grove is a census-designated place and unincorporated community located in Lamar County, Mississippi, United States. The settlement is a suburb located immediately west of Hattiesburg.
Project Gnome was the first nuclear test of Project Plowshare and was the first continental nuclear weapon test since Trinity to be conducted outside of the Nevada Test Site, and the second test in the state of New Mexico after Trinity. It was tested in southeastern New Mexico on December 10, 1961, approximately 40 km southeast of Carlsbad, New Mexico.
The Lamar County School District (LCSD) is a public school district based in Purvis, Mississippi (USA).
The Hattiesburg Metropolitan Statistical Area is a metropolitan statistical area (MSA) in southeastern Mississippi that covers three counties - Forrest, Lamar, and Perry. The MSA's principal city is Hattiesburg. The 2010 census placed the Hattiesburg MSA's population at 162,410, though estimates as of 2019 indicate the population has increased to 168,849. The area is part of the geographical region known as the Pine Belt, famous for its abundance of longleaf pine trees. The Hattiesburg MSA is part of the larger Hattiesburg-Laurel Combined Statistical Area.
The Salmon Site is a 1,470-acre (5.9 km2) tract of land in Lamar County, Mississippi, near Baxterville. The tract is located over a geological formation known as the Tatum Salt Dome and is the location of the only nuclear weapons test detonations known to have been performed in the eastern United States.
Operation Sailor Hat was a series of explosives effects tests, conducted by the United States Navy Bureau of Ships under the sponsorship of the Defense Atomic Support Agency. The tests consisted of two underwater explosions at San Clemente Island, California in 1964 and three surface explosions at Kahoʻolawe, Hawaii in 1965. They were non-nuclear tests employing large quantities of conventional explosives to determine the effects of a nuclear weapon blast on naval vessels, and the first major test of this kind since Operation Crossroads in July 1946.
Cannikin was an underground nuclear weapons test performed on November 6, 1971, on Amchitka island, Alaska, by the United States Atomic Energy Commission. The experiment, part of the Operation Grommet nuclear test series, tested the unique W71 warhead design for the LIM-49 Spartan anti-ballistic missile. With an explosive yield of almost 5 megatons of TNT (21 PJ), the test was the largest underground explosion ever detonated by the United States.
Operation Project 56 was a series of 4 nuclear tests conducted by the United States in 1955–1956 at the Nevada Test Site. These tests followed the Operation Wigwam series and preceded the Operation Redwing series.
Arnold Line is an unincorporated area and census-designated place (CDP) in Lamar County, Mississippi, United States. As of the 2020 census it had a population of 2,333. It is part of the Hattiesburg Metropolitan Statistical Area.
