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Wake Shield Facility
Wake Shield Facility (WSF) was a NASA experimental science platform that was placed in low Earth orbit by the Space Shuttle. It was a diameter, free-flying stainless steel disk. The WSF was deployed using the Space Shuttle's Canadarm. The WSF then used nitrogen gas thrusters to position itself about behind the Space Shuttle, which was at an orbital altitude of over , within the thermosphere, where the atmosphere is exceedingly tenuous. The WSF's orbital speed was at least three to four times faster than the speed of thermospheric gas molecules in the area, which resulted in a cone behind the WSF that was entirely free of gas molecules. The WSF thus created an ultrahigh vacuum in its wake. The resulting vacuum was used to study epitaxial film growth. The WSF operated at a distance from the Space Shuttle to avoid contamination from the Shuttle's rocket thrusters and water dumped overboard from the Shuttle's Waste Collection System (space toilet). After two days, the Space Shu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wake Shield Facility
Wake Shield Facility (WSF) was a NASA experimental science platform that was placed in low Earth orbit by the Space Shuttle. It was a diameter, free-flying stainless steel disk. The WSF was deployed using the Space Shuttle's Canadarm. The WSF then used nitrogen gas thrusters to position itself about behind the Space Shuttle, which was at an orbital altitude of over , within the thermosphere, where the atmosphere is exceedingly tenuous. The WSF's orbital speed was at least three to four times faster than the speed of thermospheric gas molecules in the area, which resulted in a cone behind the WSF that was entirely free of gas molecules. The WSF thus created an ultrahigh vacuum in its wake. The resulting vacuum was used to study epitaxial film growth. The WSF operated at a distance from the Space Shuttle to avoid contamination from the Shuttle's rocket thrusters and water dumped overboard from the Shuttle's Waste Collection System (space toilet). After two days, the Space Shu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gallium Arsenide
Gallium arsenide (GaAs) is a III-V direct band gap semiconductor with a Zincblende (crystal structure), zinc blende crystal structure. Gallium arsenide is used in the manufacture of devices such as microwave frequency integrated circuits, monolithic microwave integrated circuits, infrared light-emitting diodes, laser diodes, solar cells and optical windows. GaAs is often used as a substrate material for the epitaxial growth of other III-V semiconductors, including indium gallium arsenide, aluminum gallium arsenide and others. Preparation and chemistry In the compound, gallium has a +3 oxidation state. Gallium arsenide single crystals can be prepared by three industrial processes: * The vertical gradient freeze (VGF) process. * Crystal growth using a horizontal zone furnace in the Bridgman-Stockbarger technique, in which gallium and arsenic vapors react, and free molecules deposit on a seed crystal at the cooler end of the furnace. * Liquid encapsulated Czochralski process, Czoch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NASA Programs
This is a list of NASA missions, both crewed and robotic, since the establishment of NASA in 1958. There are over 80 currently active science missions. X-Plane program Since 1945, NACA (NASA's predecessor) and, since 1958, NASA have conducted the X-Plane Program. The program was originally intended to create a family of experimental aircraft not intended for production beyond the limited number of each design built solely for flight research. The first X-Plane, the Bell X-1, was the first rocket-powered airplane to break the sound barrier on October 14, 1947. X-Planes have set numerous milestones since then, both crewed and unpiloted. Human spaceflight NASA has successfully launched 166 crewed flights. Three have ended in failure, causing the deaths of seventeen crewmembers in total: Apollo 1 (which never launched) killed three crew members in 1967, STS-51-L ( the ''Challenger'' disaster) killed seven in 1986, and STS-107 ( the ''Columbia'' disaster) killed seven more ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Space Manufacturing
Space manufacturing is the production of tangible goods beyond Earth. Since most production capabilities are limited to low Earth orbit, the term in-orbit manufacturing is also frequently used. There are several rationales supporting in-space manufacturing: * The space environment, in particular the effects of microgravity and vacuum, enable the research of and production of goods that could otherwise not be manufactured on Earth. * The extraction and processing of raw materials from other astronomical bodies, also called In-Situ Resource Utilisation (ISRU) could enable more sustainable space exploration missions at reduced cost compared to launching all required resources from Earth. * Raw materials could be transported to low Earth orbit where they could be processed into goods that are shipped to Earth. By replacing terrestrial production on Earth, this seeks to preserve the Earth. * Raw materials of very high value, for example gold, silver, or platinum, could be transpo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Texas
Texas (, ; Spanish language, Spanish: ''Texas'', ''Tejas'') is a state in the South Central United States, South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2020, it is the second-largest U.S. state by both List of U.S. states and territories by area, area (after Alaska) and List of U.S. states and territories by population, population (after California). Texas shares borders with the states of Louisiana to the east, Arkansas to the northeast, Oklahoma to the north, New Mexico to the west, and the Mexico, Mexican States of Mexico, states of Chihuahua (state), Chihuahua, Coahuila, Nuevo León, and Tamaulipas to the south and southwest; and has a coastline with the Gulf of Mexico to the southeast. Houston is the List of cities in Texas by population, most populous city in Texas and the List of United States cities by population, fourth-largest in the U.S., while San Antonio is the second most pop ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Houston
Houston (; ) is the most populous city in Texas, the most populous city in the Southern United States, the fourth-most populous city in the United States, and the sixth-most populous city in North America, with a population of 2,304,580 in 2020. Located in Southeast Texas near Galveston Bay and the Gulf of Mexico, it is the seat and largest city of Harris County and the principal city of the Greater Houston metropolitan area, which is the fifth-most populous metropolitan statistical area in the United States and the second-most populous in Texas after Dallas–Fort Worth. Houston is the southeast anchor of the greater megaregion known as the Texas Triangle. Comprising a land area of , Houston is the ninth-most expansive city in the United States (including consolidated city-counties). It is the largest city in the United States by total area whose government is not consolidated with a county, parish, or borough. Though primarily in Harris County, small portions of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Space Industries Incorporated
Space Industries Incorporated was a company formed in the 1980s for the purpose of building a privately owned space station, which was to be called the Industrial Space Facility (ISF). At the time, the idea of private development in space was a pioneering one. History Space Industries was founded in Houston, Texas by Maxime Faget, who had recently retired as chief of engineering and operations at NASA, as well as entrepreneurs James Calaway, Guillermo Trotti, and Larry Bell. Their plan was to build a space station that would feed off the life support system of the Space Shuttle when it visited, but would not maintain continuous life support between shuttle visits. Faget proposed this plan because maintaining continuous life support would be cost prohibitive. Joe Allen, a physicist and astronaut, was a partner, as was Westinghouse Electric Corporation. Investors included Roy M. Huffington, an oilman and later United States ambassador to Austria; James Elkins, not to be confused wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Houston
The University of Houston (UH) is a Public university, public research university in Houston, Texas. Founded in 1927, UH is a member of the University of Houston System and the List of universities in Texas by enrollment, university in Texas with over 47,000 students. Its campus, which is primarily in southeast Houston, spans , with the inclusion of its Sugar Land and Katy sites. The university is Carnegie Classification of Institutions of Higher Education, classified as an "R1: Doctoral Universities – Very high research activity." The university offers more than 276 degree programs through its 16 academic colleges and schools and an interdisciplinary Honors College - including programs leading to professional degrees in architecture, law, optometry, medicine and pharmacy. The institution spends $203 million annually in research, and operates more than 35 research centers and institutes on campus. Interdisciplinary research includes superconductivity, space commercializatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Center For Advanced Materials, University Of Houston
The Center for Advanced Materials, formerly the Space Vacuum Epitaxy Center, is a laboratory established in 1986 at the University of Houston for researching the science and application of advanced materials. It is hosted in of space in three buildings on the Houston campus. Its facilities contain equipment dedicated to thin-film deposition, processing and characterization of III-V compound semiconductors, high-temperature superconductivity, and ferroelectric oxide material systems. The Wake Shield Facility was developed at this center. See also * Epitaxy Epitaxy refers to a type of crystal growth or material deposition in which new crystalline layers are formed with one or more well-defined orientations with respect to the crystalline seed layer. The deposited crystalline film is called an epit ... External links * archive of the old SVEC website University of Houston campus Materials science institutes Science and technology in Texas Research institutes in T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Torr
The torr (symbol: Torr) is a unit of pressure based on an absolute scale, defined as exactly of a standard atmosphere (). Thus one torr is exactly (≈ ). Historically, one torr was intended to be the same as one "millimeter of mercury", but subsequent redefinitions of the two units made them slightly different (by less than ). The torr is not part of the International System of Units (SI). It is often combined with the metric prefix milli to name one millitorr (mTorr) or 0.001 Torr. The unit was named after Evangelista Torricelli, an Italian physicist and mathematician who discovered the principle of the barometer in 1644. Nomenclature and common errors The unit name ''torr'' is written in lower case, while its symbol ("Torr") is always written with upper-case initial; including in combinations with prefixes and other unit symbols, as in "mTorr" (millitorr) or "Torr⋅L/s" (torr-litres per second). The symbol (uppercase) should be used with prefix symbols (thus, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ambient Pressure
Ambient or Ambiance or Ambience may refer to: Music and sound * Ambience (sound recording), also known as atmospheres or backgrounds * Ambient music, a genre of music that puts an emphasis on tone and atmosphere * ''Ambient'' (album), by Moby * ''Ambience'' (album), by the Lambrettas * Virgin Ambient series, a series of 24 albums released on the UK Virgin Records label between 1993 and 1997 *''Ambient 1–4'', a set of four albums by Brian Eno, released by Obscure Records between 1978 and 1982 Other * Ambient (computation), a process calculus * Ambient (desktop environment), a MUI-based desktop environment for MorphOS * ''Ambient'' (novel), a novel by Jack Womack * Mark Ambient (1860–1937), pen name of Harold Harley, English dramatist * ''Ambiancé ''Ambiancé'' was an experimental film directed by Swedish director Anders Weberg. The film was expected to have a running time of 720 hours (or 30 days) and initially had a projected release date of 31 December 2020. Once the fi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ceramic
A ceramic is any of the various hard, brittle, heat-resistant and corrosion-resistant materials made by shaping and then firing an inorganic, nonmetallic material, such as clay, at a high temperature. Common examples are earthenware, porcelain, and brick. The earliest ceramics made by humans were pottery objects (''pots,'' ''vessels or vases'') or figurines made from clay, either by itself or mixed with other materials like silica, hardened and sintered in fire. Later, ceramics were glazed and fired to create smooth, colored surfaces, decreasing porosity through the use of glassy, amorphous ceramic coatings on top of the crystalline ceramic substrates. Ceramics now include domestic, industrial and building products, as well as a wide range of materials developed for use in advanced ceramic engineering, such as in semiconductors. The word "'' ceramic''" comes from the Greek word (), "of pottery" or "for pottery", from (), "potter's clay, tile, pottery". The earliest kno ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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