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Movements, leaders, victories and the continuing fight for equality.
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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
 | |
| Country of origin | |
|---|---|
| First flight | 1988-07-07 |
| Designer | KB KhIMMASH |
| Application | Upper Stage |
| Associated LV | Soyuz, Zenit |
| Status | In production |
| Liquid-fuel engine | |
| Propellant | N2O4 / UDMH |
| Mixture ratio | 2.0 |
| Cycle | Gas generator |
| Configuration | |
| Chamber | 1 |
| Performance | |
| Thrust, vacuum | 19.61 kilonewtons (4,410 lbf) |
| Chamber pressure | 9.61 megapascals (1,394 psi) |
| Specific impulse, vacuum | 327 seconds |
| Burn time | 2,000 seconds |
| Dimensions | |
| Length | 1,028 millimetres (40.5 in) |
| Diameter | 838 millimetres (33.0 in)(max) |
| Dry mass | 75 kilograms (165 lb) |
| Used in | |
| Fregat and Phobos program | |
| References | |
| References | [1][2][3][4] |
The S5.92 is a Russian rocket engine, currently used on the Fregat upper stage. It burns a hypergolic mixture of unsymmetrical dimethylhydrazine (UDMH) fuel with dinitrogen tetroxide (N2O4) oxidizer in a gas-generator cycle.
The S5.92 has two throttle settings. The highest produces 19.61 kilonewtons (4,410 lbf) of thrust, a specific impulse of 327 seconds, and a 3-second ignition transient. The lower throttle level produces 13.73 kilonewtons (3,090 lbf) of thrust, specific impulse of 316 seconds, and a 2.5 second ignition transient. It is rated for 50 ignitions, and 300 days between ignitions.[1]
It was originally designed by the famous A.M. Isayev Chemical Engineering Design Bureau, for the two spacecraft of the Phobos program. While the Mars missions were unsuccessful, the spacecraft manufacturer, NPO Lavochkin, found a market niche for the technology. Thus, the engine was adapted for use on the optional Fregat upper stage of the Soyuz and Zenit launch vehicles.[1][4]
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| Solid fuel |
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Spacecraft engines and motors | ||
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| Liquid fuel engines |  | |
| Solid propellant motors | ||
| Related articles | ||
 | This rocketry article is a stub. You can help Wikipedia by adding missing information. |
Source: Wikipedia. Article content is retrieved live through the MediaWiki API.
The S5.92 is a Russian rocket engine, currently used on the Fregat upper stage. It burns a hypergolic mixture of unsymmetrical dimethylhydrazine (UDMH) fuel with dinitrogen tetroxide (N2O4) oxidizer in a gas-generator cycle.
The UMTS frequency bands are radio frequencies used by third generation (3G) wireless Universal Mobile Telecommunications System networks. They were allocated by delegates to the World Administrative Radio Conference (WARC-92) held in Málaga-Torremolinos, Spain between 3 February 1992 and 3 March 1992. Resolution 212 (Rev.WRC-97), adopted at the World Radiocommunication Conference held in Geneva, Switzerland in 1997, endorsed the bands specifically for the International Mobile Telecommunications-2000 (IMT-2000) specification by referring to S5.388, which states "The bands 1,885-2,025 MHz and 2,110-2,200 MHz are intended for use, on a worldwide basis, by administrations wishing to implement International Mobile Telecommunications 2000 (IMT-2000). Such use does not preclude the use of these bands by other services to which they are allocated. The bands should be made available for IMT-2000 in accordance with Resolution 212 (Rev. WRC-97)." To accommodate the reality that these initially defined bands were already in use in various regions of the world, the initial allocation has been amended multiple times to include other radio frequency bands.
The S5.98M, also known as the 14D30, is a Russian rocket engine, currently powering the Briz upper stages. It was designed by KB KhIMMASH, the famous Isaev designed bureau. It burns a hypergolic mixture of unsymmetrical dimethylhydrazine (UDMH) fuel with dinitrogen tetroxide (N2O4) oxidizer in a gas-generator cycle.
Line S5 of the Chengdu Metro (Chinese: 成都地铁S5线) also known as Chengdu-Meishan Line (成都至眉山线) and shortened as Chengmei Line (成眉线) or Meishan Line (眉山线), is a metro line in Chengdu, China. The line starts from Honglian station, Line 19, Tianfu New Area, Chengdu, and ends at Meishan East Railway Station (Metro & National Railway), Dongpo, Meishan. The line is 59 km long, has 5 underground stations and 8 elevated/ground stations. Construction started on September 26, 2022, and is expected to open in December 2026.
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 →Shirley Chisholm, elected in 1968.