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Radar beacon (short: racon) is – according to article 1.103 of the International Telecommunication Union's (ITU) ITU Radio Regulations (RR) [1] – defined as "A transmitter-receiver associated with a fixed navigational mark which, when triggered by a radar, automatically returns a distinctive signal which can appear on the display of the ...
A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens. It is widely used in optical engineering laboratory work to analyze and ...
Duplicate bridge movements. A duplicate bridge movement is a scheme used in a duplicate bridge session to arrange which competitors play which opponents when, and which boards they play. The arrangement has to satisfy various constraints which often conflict to some extent, requiring compromises.
The Sahm Rule, developed by economist Claudia Sahm, says that the US economy has entered a recession if the three-month average of the national unemployment rate has risen 0.5% or more from the ...
The National Flood Insurance Program covers up to $250,000 for a building and offers policies to protect contents worth as much as $100,000. That’s not always enough to replace an entire ...
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United States Army Lt. Gen. John Kimmons with a copy of the Army Field Manual, FM 2-22.3, Human Intelligence Collector Operations, in 2006. FM-34-45. United States Army Field Manuals are published by the United States Army 's Army Publishing Directorate. They contain detailed information and how-tos for procedures important to soldiers serving ...
A federal judge ordered Monday that the University of California, Los Angeles, craft a plan to protect Jewish students, months after pro-Palestinian protests broke out on campus. Three Jewish ...