Civil Rights
Movements, leaders, victories and the continuing fight for equality.
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Explore the people, places, events, achievements, struggles and stories that shaped our journey.
Movements, leaders, victories and the continuing fight for equality.
Innovation, patents, science, technology and world-changing contributions.
Pioneers, champions, Negro Leagues, records, activism and excellence.
Meet the people whose lives, choices and achievements shaped the journey.
Black towns, communities, institutions and places where history happened.
Moments that changed communities, movements, institutions and the nation.
In August 1908, a white mob attacked Springfield, Illinois’s Black community, destroying homes and businesses and lynching two Black men. National outrage over the violence helped spur the movement that created the NAACP the following year.
MORE →Reflects the personal views, recollections, and perspective of the author, Mike Davis.
This is a personal recollection on the Move fire on May 13, 1985
 Diagram of PSSC-2 | |
| Mission type | Technology |
|---|---|
| Operator | US Air Force |
| COSPAR ID | 2011-031B |
| SATCAT no. | 37752 |
| Spacecraft properties | |
| Manufacturer | Aerospace Corporation |
| Launch mass | 3.7 kilograms (8.2 lb) |
| Start of mission | |
| Launch date | 8 July 2011, 15:29 UTC |
| Rocket | Space Shuttle Atlantis STS-135 |
| Launch site | Kennedy LC-39A |
| End of mission | |
| Decay date | 8 December 2011 |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Low Earth |
PSSC-2, or Pico-Satellite Solar Cell Testbed 2,[1] also known as PSSC-Testbed 2, is a miniaturised satellite which was operated by the United States Air Force as part of a technology demonstration programme. It was the last satellite to be deployed from a Space Shuttle.[2]
PSSC-2 was launched aboard Space Shuttle Atlantis on its final mission, STS-135. The launch took place from Launch Complex 39A at the Kennedy Space Center, at 15:29 UTC on 8 July 2011.[3] PSSC-2, along with a deployment mechanism, was carried to orbit in the payload bay of the Shuttle, attached to the right wall behind the Orbiter Docking System.[4] It remained attached during Atlantis' visit to the International Space Station, and was originally scheduled to be deployed at 07:11 UTC on 19 July, the day after undocking.[5] With the extension of the STS-135 mission, undocking, and hence deployment, was delayed by one day.[6]
PSSC-2 is the second PSSC satellite, following PSSC-1 which was deployed from Space Shuttle Endeavour during STS-126 in 2008. It carries two technology demonstration experiments: Miniature Tracking Vehicle (MTV), and the Compact Total Electron Content Sensor (CTECS). MTV will test the satellite's ability to function as a reference body for tracking stations, whilst CTECS will observe the signals from occulting Global Positioning System satellites in order to study the density of the ionosphere. The satellite also carries cameras intended to capture the last images of a Space Shuttle in orbit, shortly after separation.[2]
PSSC-2 is a 3.7-kilogram (8.2 lb) spacecraft which was built by the Aerospace Corporation, and is equipped with three-axis stabilisation, adaptive communications systems, and systems to monitor the energy produced by its solar cells. Four ammonium perchlorate solid rocket motors, each capable of generating 40 newtons (9.0 lbf) of thrust, will be used for manoeuvring one month after launch; either to raise the satellite's orbit or to deorbit it.[7]
Source: Wikipedia. Article content is retrieved live through the MediaWiki API.
PSSC-2, or Pico-Satellite Solar Cell Testbed 2, also known as PSSC-Testbed 2, is a miniaturised satellite which was operated by the United States Air Force as part of a technology demonstration programme. It was the last satellite to be deployed from a Space Shuttle.
Silicon monoxide is the chemical compound with the formula SiO where silicon is present in the oxidation state +2. In the vapour phase, it is a diatomic molecule. It has been detected in stellar objects and has been described as the most common oxide of silicon in the universe.
Aluminium gallium nitride (AlGaN) is a wide-bandgap semiconductor material. It is an alloy of aluminium nitride and gallium nitride. The bandgap of AlxGa1-xN can be tailored to range from 3.4 eV (bandgap of GaN) to 6.2 eV (bandgap of AlN) depending on the AlN mole fraction, x . {\displaystyle x.} AlGaN is used to manufacture light-emitting diodes operating in the blue to ultraviolet region of the spectrum. Emission wavelengths in the far-UV region (around 250 nm) have been achieved, with some research teams reporting emission with wavelengths as short as 222 nm and 210 nm. AlGaN is also used in blue semiconductor lasers, detectors of ultraviolet radiation, and AlGaN/GaN high-electron-mobility transistors. AlGaN is often used together with gallium nitride or aluminium nitride to form heterojunctions. AlGaN layers are commonly grown on Gallium nitride, on sapphire or (111) Si substrates, and almost always with additional GaN layers.
The International Workshop on Nitride Semiconductors (IWN) is a biennial academic conference in the field of group III nitride research. The IWN and the International Conference on Nitride Semiconductors (ICNS) are held in alternating years and cover similar subject areas. IWN is pioneered by Isamu Akasaki (Nagoya University, Meijo University) and Hiroshi Amano (Nagoya University), who are Nobel laureates in physics (2014) - IWN2018 was held 11–16 November 2018 in Kanazawa, Japan, and chaired by Hiroshi Fujioka (the University of Tokyo, Japan) - IWN2016 was held 2–7 October 2016 in Orlando, United States, and jointly chaired by Alan Doolittle (Georgia Institute of Technology and Tomás Palacios (Massachusetts Institute of Technology, USA) - IWN2012 was held 14–19 October 2012 in Sapporo, Japan and chaired by Hiroshi Amano (Nagoya University, Japan).
Before the 1921 destruction of Tulsa’s Greenwood District, Black residents had created a remarkable center of business and community life. The district included stores, professional offices, entertainment venues and homes owned by Black citizens. Understanding Greenwood means learning what was built—not only what was burned.
MORE →Mae Jemison, aboard Space Shuttle Endeavour in 1992.
