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Plasma Thruster
A plasma propulsion engine is a type of electric propulsion that generates thrust from a quasi-neutral plasma. This is in contrast with ion thruster engines, which generate thrust through extracting an ion current from the plasma source, which is then accelerated to high velocities using grids/ anodes. These exist in many forms (see electric propulsion). However, in the scientific literature, the term " plasma thruster" sometimes encompasses thrusters usually designated as "ion engines". Plasma thrusters do not typically use high voltage grids or anodes/ cathodes to accelerate the charged particles in the plasma, but rather use currents and potentials that are generated internally to accelerate the ions, resulting in a lower exhaust velocity given the lack of high accelerating voltages. This type of thruster has a number of advantages. The lack of high voltage grids of anodes removes a possible limiting element as a result of grid ion erosion. The plasma exhaust is 'quasi-ne ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urine
Urine is a liquid by-product of metabolism in humans and in many other animals. Urine flows from the kidneys through the ureters to the urinary bladder. Urination results in urine being excreted from the body through the urethra. Cellular metabolism generates many by-products that are rich in nitrogen and must be cleared from the bloodstream, such as urea, uric acid, and creatinine. These by-products are expelled from the body during urination, which is the primary method for excreting water-soluble chemicals from the body. A urinalysis can detect nitrogenous wastes of the mammalian body. Urine plays an important role in the earth's nitrogen cycle. In balanced ecosystems, urine fertilizes the soil and thus helps plants to grow. Therefore, urine can be used as a fertilizer. Some animals use it to mark their territories. Historically, aged or fermented urine (known as lant) was also used for gunpowder production, household cleaning, tanning of leather and dyeing of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Franklin Chang-Díaz
Franklin Ramón Chang-Díaz (born April 5, 1950) is a Costa Rican-born American mechanical engineer, physicist and former NASA astronaut. He is the sole founder and CEO of Ad Astra Rocket Company as well as a member of Cummins' board of directors. He became an American citizen in 1977., ''Wired Science'', November 14, 2007 He is a veteran of seven Space Shuttle missions, tying the record, as of 2021 for the most spaceflights (a record set by Jerry L. Ross). He was the third Latin American, but the first Latin American immigrant NASA Astronaut selected to go into space. Chang-Díaz is a member of the NASA Astronaut Hall of Fame. Family and education Franklin Ramón Chang-Díaz was born in San José, Costa Rica on April 5, 1950, to Ramón Ángel Chang Morales, an oil worker whose own father fled China during the Boxer Rebellion, and María Eugenia Díaz Romerois. One of six children, he has a younger sister, Sonia Rosa (born December 1952) and his mother, brothers and siste ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Liberia, Costa Rica
Liberia () is a district and the largest city in the Guanacaste Province of Costa Rica, located northwest of the national capital, San José, in the canton with the same name, of which it is the head city or capital. It is a major center for the country's tourism industry. Liberia has been nicknamed ''la ciudad blanca'' (the white city) due to the white gravel that was once used to make the city's roads and the whitewashed colonial houses which used to make up a large part of the city. It had a population of 56,899 in 2013. History Modern-day Liberia was founded as a hermitage without any legal or formal act of foundation on 4 September 1769. It was located in a strategic location where the roads from the towns of Rivas, Bagaces, and Nicoya met. The hermitage was used primarily as place of rest by travelers. The area's giant guanacaste trees provided shade for travelers and livestock and over time the area became known as Guanacaste (El Poblado de Guanacaste). The settlemen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nautel
Nautel Ltd. is a Canadian manufacturer of AM and FM radio broadcast transmitters, navigational radio beacons, Differential Global Positioning System (DGPS) transmitters, NOAA weather radio transmitters, LF PNT/ eLORAN transmitters, SONAR high-power low-frequency amplifiers and SONAR systems, medium frequency (MF) telegraph and NAVTEX transmitters, and high frequency (HF) amplifiers for dielectric heating applications. Nautel is best known as the first company to develop a commercially available fully solid state broadcast transmitter. History Nautel was founded in 1969 in the rural community of Hackett's Cove, Nova Scotia. Its primary operation was building and supplying solid state navigation beacons for the Canadian government. To better serve the US market, Nautel Maine Inc., a wholly owned subsidiary located in Bangor, Maine, was founded in 1974. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canada
Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by total area. Its southern and western border with the United States, stretching , is the world's longest binational land border. Canada's capital is Ottawa, and its three largest metropolitan areas are Toronto, Montreal, and Vancouver. Indigenous peoples have continuously inhabited what is now Canada for thousands of years. Beginning in the 16th century, British and French expeditions explored and later settled along the Atlantic coast. As a consequence of various armed conflicts, France ceded nearly all of its colonies in North America in 1763. In 1867, with the union of three British North American colonies through Confederation, Canada was formed as a federal dominion of four provinces. This began an accretion of provinces an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ad Astra Rocket Company
The Ad Astra Rocket Company is an American rocket propulsion company dedicated to the development of advanced plasma rocket propulsion technology. Located in Webster, Texas, three miles away from NASA's Johnson Space Center, the company was incorporated on January 14, 2005. The President and CEO of Ad Astra Rocket Company is retired astronaut Franklin Chang Díaz.Ad Astra Rocket Company – About us company website, accessed 2010-03-10 The company has been working on Chang Díaz's concept of the Variable Specific Impulse Magnetoplasma Rocket, known by its acronym VASIMR. The VASIMR is intended to achieve several advantages over current chemical rocket designs, including lunar cargo transport, in-space refueling, and ultr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wuhan University
Wuhan University (WHU; ) is a public research university in Wuhan, Hubei. The university is sponsored by the Ministry of Education. Wuhan university was founded as one of the four elite universities in the early republican period of China and is considered as the oldest university in China according to its university history document. Wuhan University is located at Luojia Hill, with palatial buildings blending Chinese and Western styles. It is ranked by many as one of the most beautiful (or the most beautiful) campuses in China for decades. Wuhan University is one of the most prestigious and selective universities in China, and was recognized by the Chinese Ministry of Education in Double First Class University. It is a Project 985 and Project 211 institute. The university is well known for research in fields such as the social sciences, remote sensing, survey engineering, and hydraulic engineering. Wuhan University has been perennially ranked among the top-tier universities in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
TacSat-2
TacSat-2 is the first in a series of U.S. military experimental technology and communication satellites.TacSat-2 (also known as JWS-D1 ((Joint Warfighting Space-Demonstrator 1) or RoadRunner) was an experimental satellite built by the USAF's Air Force Research Laboratory with an operational life expected to be not more than one year as part of the "Advanced Concept Technology Demonstration" program. Purpose The TacSat series of experimental spacecraft are designed to allow military commanders on a battlefield to request and obtain imagery and other data from a satellite as it passes overhead. Collected data will be delivered to field commanders in minutes rather than hours or days. The sensor on TacSat-2 could collect color images sharp enough to distinguish ground objects as small as 1 meter in diameter. Systems Satellites in the TacSat series were planned to use commercial or available launchers, and largely off-the-shelf components, in order to reduce costs. Satellite ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Busek
Busek Co. Inc. is an American spacecraft propulsion company that provides thrusters, electronics, and complete systems for spacecraft. History Busek was founded in 1985 by Vlad Hruby and incorporated in Natick, Massachusetts. It started as a laboratory outside of Boston, Massachusetts, but later expansions increased the size of Busek's facilities to a floor space of approximately 20,000 square feet. Flight missions Busek's products have been flown on several missions, which include: TacSat-2 The first US Hall thruster flown in space, Busek's BHT-200, was launched aboard the Air Force Research Laboratory's (AFRL) TacSat-2 satellite. The Busek thruster was part of the Microsatellite Propulsion Integration (MPI) Experiment and was integrated on TacSat-2 under the direction of the DoD Space Test Program. TacSat-2 launched on December 16, 2006, from the NASA Wallops Flight Facility. LISA Pathfinder The first electrospray thruster in space was manufactured by Busek and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helicon Double Layer Thruster
The helicon double-layer thruster is a prototype spacecraft propulsion engine. It was created by Australian scientist Dr Christine Charles, based on a technology invented by Professor Rod Boswell, both of the Australian National University. The design has been verified by the ESA, which is participating in its development. Theory of operation A helicon double-layer thruster (HDLT) is a type of plasma thruster, which ejects high velocity ionized gas to provide thrust to a spacecraft. In this thruster design, gas is injected into a tubular chamber (the ''source tube'') with one open end. Radio frequency AC power (at 13.56 MHz in the prototype design) is coupled into a specially shaped antenna wrapped around the chamber. The electromagnetic wave emitted by the antenna causes the gas to break down and form a plasma. The antenna then excites a helicon wave in the plasma, which further heats the plasma. The device has a roughly constant magnetic field in the source tube (supp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Australian National University
The Australian National University (ANU) is a public research university located in Canberra, the capital of Australia. Its main campus in Acton encompasses seven teaching and research colleges, in addition to several national academies and institutes. ANU is regarded as one of the world's leading universities, and is ranked as the number one university in Australia and the Southern Hemisphere by the 2022 QS World University Rankings and second in Australia in the '' Times Higher Education'' rankings. Compared to other universities in the world, it is ranked 27th by the 2022 QS World University Rankings, and equal 54th by the 2022 '' Times Higher Education''. In 2021, ANU is ranked 20th (1st in Australia) by the Global Employability University Ranking and Survey (GEURS). Established in 1946, ANU is the only university to have been created by the Parliament of Australia. It traces its origins to Canberra University College, which was established in 1929 and was integrated ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
