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In electronics, a step recovery diode (SRD, snap-off diode or charge-storage diode or memory varactor [a]) is a semiconductor junction diode with the ability to generate extremely short pulses. It has a variety of uses in microwave (MHz to GHz range) electronics as pulse generator or parametric amplifier .
A new OGL-licensed SRD based on 5th edition was released in January 2016, and updated to version 5.1 in May 2016. [9] [10] In January 2023, Wizards of the Coast announced that the full D&D System Reference Document 5.1 (SRD 5.1) would be released under the CC-BY-4.0 license. [11] [12] [13]
SRD – seismic reference datum, an imaginary horizontal surface at which TWT [clarification needed] is assumed to be zero [citation needed] SREC – seismic record log; SRJ – semi-rigid jumper; SRK – Soave-Redlich-Kwong; SRO – surface read-out; SRP – sucker rod pump; SRB – sulfate-reducing bacteria; SRT – site receival test
Many SRd stars are extremely luminous hypergiants, including the naked-eye ρ Cas, V509 Cas, and ο 1 Cen. Others are classified as giant stars, but the brightest example is the seventh-magnitude LU Aqr. [2] Most SRS variables have been discovered in deep large-scale surveys, but the naked-eye stars V428 And, AV Ari, and EL Psc are also members ...
SRD may refer to: Sardinian language's ISO 639 code; Serenissimus Rudolfus Dux, a title of Archduke Rudolf of Austria; Services Reconnaissance Department, an Australian WWII agency; Short-range device for radio communication; Sports Radio Detroit; SR-D, a Dolby technology; Stapleton Road railway station's station code; Step recovery diode
Variable stars such as R Puppis have been described as pseudo-Cepheids, because they lie above the high-luminosity portion of the instability strip and their variations are similar to those of Cepheids although less regular. [11] R Puppis is formally classified as a semiregular variable of type SRd, meaning F, G, or K giants or supergiants. [2]
A short-range device (SRD), described by ECC Recommendation 70-03, is a radio-frequency transmitter device used in telecommunication that has little capability of causing harmful interference to other radio equipment.
At that stage the luminosity was around 243,000 L ☉ and the radius 680 R ☉. The star then varied erratically until 1973 when it rapidly expanded and cooled. A detailed spectral analysis in 1977 reported a temperature low of 4,000K, with a peak luminosity in 1976 of 400,000 L ☉ with a radius of over 900 R ☉ .