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Christine Darden
Christine Darden (born September 10, 1942, as Christine Mann) is an American mathematician, data analyst, and aeronautical engineer who devoted much of her 40-year career in aerodynamics at NASA to researching supersonic flight and sonic booms. She had an M.S. in mathematics and had been teaching at Virginia State University before starting to work at the Langley Research Center in 1967. She earned a Ph.D. in engineering at George Washington University in 1983 and has published numerous articles in her field. She was the first African-American woman at NASA's Langley Research Center to be promoted to the Senior Executive Service (United States), Senior Executive Service, the top rank in the federal civil service. Darden is one of the researchers featured in the book ''Hidden Figures (book), Hidden Figures: The American Dream and the Untold Story of the Black Women Mathematicians Who Helped Win the Space Race'' (2016), a history of some of the influential African-American women ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monroe, North Carolina
Monroe is a city in and the county seat of Union County, North Carolina, United States. The population increased from 32,797 in 2010 to 34,551 in 2020. It is within the rapidly growing Charlotte metropolitan area. Monroe has a council-manager form of government. History Monroe was founded as a planned settlement. In 1843, the first Board of County Commissioners, appointed by the General Assembly, selected an area in the center of the county as the county seat, and Monroe was incorporated that year. It was named for James Monroe, the country's fifth president. It became a trading center for the agricultural areas of the Piedmont region, which cultivated tobacco. Monroe was home to the Starlite Speedway in the 1960s to 1970s. On May 13, 1966, the 1/2 mile dirt track hosted NASCAR's 'Independent 250.' Darel Dieringer won the race. Since 1984, Ludwig drums and timpani have been manufactured in Monroe. As part of the developing Charlotte metropolitan area, in the 21st century, Mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valedictorian
Valedictorian is an academic title for the highest-performing student of a graduating class of an academic institution. The valedictorian is commonly determined by a numerical formula, generally an academic institution's grade point average (GPA) system, but other methods of selection may be used or factored in such as community service or extra-curricular activity. The term is an Anglicised derivation of the Latin ''vale dicere'' ("to say farewell"), historically rooted in the valedictorian's traditional role as the final speaker at the graduation ceremony commencement before the students receive their diplomas. The valedictory address, also known as the valediction, is generally considered a final farewell to classmates, before they disperse to pursue their individual paths after graduating. The term is not widely used or known outside the US, although some countries may award equivalent titles. In Australia, the title is sometimes awarded to a member of a graduating universit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hampton, Virginia
Hampton () is an independent city (United States), independent city in the Commonwealth (U.S. state), Commonwealth of Virginia in the United States. As of the 2020 United States Census, 2020 census, the population was 137,148. It is the List of cities in Virginia, 7th most populous city in Virginia and List of United States cities by population, 204th most populous city in the nation. Hampton is included in the Hampton Roads United States metropolitan area, Metropolitan Statistical Area (officially known as the Virginia Beach–Norfolk–Newport News, VA–NC MSA) which is the List of United States metropolitan statistical areas by population, 37th largest in the United States, with a total population of 1,799,674 (2020). This area, known as "America's First Region", also includes the independent cities of Chesapeake, Virginia, Chesapeake, Virginia Beach, Virginia, Virginia Beach, Newport News, Virginia, Newport News, Norfolk, Virginia, Norfolk, Portsmouth, Virginia, Portsmou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jim Crow
The Jim Crow laws were state and local laws enforcing racial segregation in the Southern United States. Other areas of the United States were affected by formal and informal policies of segregation as well, but many states outside the South had adopted laws, beginning in the late 19th century, banning discrimination in public accommodations and voting. Southern laws were enacted in the late 19th and early 20th centuries by white Southern Democrat-dominated state legislatures to disenfranchise and remove political and economic gains made by African Americans during the Reconstruction era. Jim Crow laws were enforced until 1965. In practice, Jim Crow laws mandated racial segregation in all public facilities in the states of the former Confederate States of America and in some others, beginning in the 1870s. Jim Crow laws were upheld in 1896 in the case of '' Plessy vs. Ferguson'', in which the Supreme Court laid out its "separate but equal" legal doctrine concerning facil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
West Area Computers
The West Computers (West Area Computing Unit, West Area Computers) were the African American, female mathematicians who worked as human computers at the Langley Research Center of NACA (predecessor of NASA) from 1943 through 1958. These women were a subset of the hundreds of female mathematicians who began careers in aeronautical research during World War II. To offset the loss of manpower as men joined the war effort, many U.S. organizations began hiring, and actively recruiting, more women and minorities during the 1940s. In 1935, the Langley Research Center had five female human computers on staff. By 1946, the Langley Research Center had recruited about 400 female human computers. The West Computers were originally subject to Virginia's Jim Crow laws and got their name because they worked at Langley's West Area, while the white mathematicians worked in the East section. In order to work at NACA, the applicants had to pass a civil service exam. Despite Executive Order 8802 out ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Supersonic Flow
Choked flow is a compressible flow effect. The parameter that becomes "choked" or "limited" is the fluid velocity. Choked flow is a fluid dynamic condition associated with the venturi effect. When a flowing fluid at a given pressure and temperature passes through a constriction (such as the throat of a convergent-divergent nozzle or a valve in a pipe) into a lower pressure environment the fluid velocity increases. At initially subsonic upstream conditions, the conservation of energy principle requires the fluid velocity to increase as it flows through the smaller cross-sectional area of the constriction. At the same time, the venturi effect causes the static pressure, and therefore the density, to decrease at the constriction. Choked flow is a limiting condition where the mass flow will not increase with a further decrease in the downstream pressure environment for a fixed upstream pressure and temperature. For homogeneous fluids, the physical point at which the choking occurs fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Depletion Of The Ozone Layer
Ozone depletion consists of two related events observed since the late 1970s: a steady lowering of about four percent in the total amount of ozone in Earth's atmosphere, and a much larger springtime decrease in stratospheric ozone (the ozone layer) around Earth's polar regions. The latter phenomenon is referred to as the ozone hole. There are also springtime polar tropospheric ozone depletion events in addition to these stratospheric events. The main causes of ozone depletion and the ozone hole are manufactured chemicals, especially manufactured halocarbon refrigerants, solvents, propellants, and foam-blowing agents (chlorofluorocarbons (CFCs), HCFCs, halons), referred to as ozone-depleting substances (ODS). These compounds are transported into the stratosphere by turbulent mixing after being emitted from the surface, mixing much faster than the molecules can settle. Once in the stratosphere, they release atoms from the halogen group through photodissociation, which catalyze t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Noise Pollution
Noise pollution, also known as environmental noise or sound pollution, is the propagation of noise with ranging impacts on the activity of human or animal life, most of them are harmful to a degree. The source of outdoor noise worldwide is mainly caused by machines, transport, and propagation systems.Senate Public Works Committee. ''Noise Pollution and Abatement Act of 1972''. S. Rep. No. 1160, 92nd Congress. 2nd session Poor urban planning may give rise to noise disintegration or pollution, side-by-side industrial and residential buildings can result in noise pollution in the residential areas. Some of the main sources of noise in residential areas include loud music, transportation (traffic, rail, airplanes, etc.), lawn care maintenance, construction, electrical generators, wind turbines, explosions, and people. Documented problems associated with noise in urban environments go back as far as ancient Rome. Research suggests that noise pollution in the United States is the high ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aerodynamics
Aerodynamics, from grc, ἀήρ ''aero'' (air) + grc, δυναμική (dynamics), is the study of the motion of air, particularly when affected by a solid object, such as an airplane wing. It involves topics covered in the field of fluid dynamics and its subfield of gas dynamics. The term ''aerodynamics'' is often used synonymously with gas dynamics, the difference being that "gas dynamics" applies to the study of the motion of all gases, and is not limited to air. The formal study of aerodynamics began in the modern sense in the eighteenth century, although observations of fundamental concepts such as aerodynamic drag were recorded much earlier. Most of the early efforts in aerodynamics were directed toward achieving Aircraft#Heavier than air – aerodynes, heavier-than-air flight, which was first demonstrated by Otto Lilienthal in 1891. Since then, the use of aerodynamics through mathematical analysis, empirical approximations, wind tunnel experimentation, and computer simu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Facts On File
Infobase Publishing is an American publisher of reference book titles and textbooks geared towards the North American library, secondary school, and university-level curriculum markets. Infobase operates a number of prominent imprints, including Facts On File, Films for the Humanities & Sciences, Cambridge Educational, Chelsea House (which also serves as the imprint for the special collection series, "Bloom's Literary Criticism" under the direction of literary critic Harold Bloom), and Ferguson Publishing. History The private equity firm Veronis Suhler Stevenson bought Facts on File and Chelsea House in 2005. Infobase bought Films for the Humanities & Sciences in 2007 and the ''World Almanac'' in 2009. In 2017, Infobase acquired The Mailbox lesson plans and ''Learning'' magazine. Veronis Suhler Stevenson sold Infobase to another private equity firm, Centre Lane Partners, in 2018. As well as nonfiction works in print, Infobase and its imprints publish a selection of works in di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Virginia State College
Virginia State University (VSU or Virginia State) is a public historically Black land-grant university in Ettrick, Virginia. Founded on , Virginia State developed as the United States's first fully state-supported four-year institution of higher learning for Black Americans. The university is a member school of the Thurgood Marshall College Fund. History Virginia State University was founded on March 6, 1882, when the legislature passed a bill to charter the Virginia Normal and Collegiate Institute. The bill was sponsored by Delegate Alfred W. Harris, a Black attorney whose offices were in Petersburg, but who lived in and represented Dinwiddie County in the General Assembly. A hostile lawsuit delayed opening day for nineteen months, until October 1, 1883. In 1902, the legislature revised the charter act to curtail the collegiate program and to change the name to Virginia Normal and Industrial Institute. In 1920, the land-grant program for Black students was moved from a pri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sit-in
A sit-in or sit-down is a form of direct action that involves one or more people occupying an area for a protest, often to promote political, social, or economic change. The protestors gather conspicuously in a space or building, refusing to move unless their demands are met. The often clearly visible demonstrations are intended to spread awareness among the public, or disrupt the goings-on of the protested organisation. Lunch counter sit-ins were a nonviolent form of protest used to oppose segregation during the civil rights movement, and often provoked heckling and violence from those opposed to their message. United States Civil rights movement The Fellowship of Reconciliation (FOR) and the Congress of Racial Equality (CORE) conducted sit-ins as early as the 1940s. Ernest Calloway refers to Bernice Fisher as "Godmother of the restaurant 'sit-in' technique." In August 1939, African-American attorney Samuel Wilbert Tucker organized the Alexandria Library sit-in at the then- r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
