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Discover LudwigThe phrase "SOS signals" is correct and usable in written English.
It can be used when referring to distress signals, particularly the internationally recognized signal for help in emergencies. Example: "The sailors sent out SOS signals when their boat began to sink."
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Following the disaster in 1912, numerous official inquiries resulted in a myriad of reforms, from standardizing SOS signals to requiring ocean liners to maintain radio communications at all times which offer striking parallels with the current situation.
Even if they don't turn out to be alien SOS signals, it's good solid science.
Although the WL estimation problem considered is very general, its applicability is limited to SOS signals.
One of its secrets is revealed in the 24 November issue of Science: a scissors-like protein called YopJ cuts the communication lines of human macrophage cells, leaving them unable to send SOS signals to other immune cells.
In this framework, WL estimation algorithms for computing all types (filtering, prediction, and smoothing) of estimates have been devised in [8] for second-order stationary (SOS) signals, i.e., those signals with constant mean function and both correlation and pseudocorrelation functions only dependent on the difference of time instants.
The crew fought the fire for about two hours, but, realizing the severity of the fire and the limited options for dousing it in the high seas, Captain Francis Inch of Volturno had his wireless operator send out SOS signals.
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Interfax cited another unnamed source as saying the plane had not sent an SOS signal.
"And while they won, the aliens sent some kind of SOS signal out in deep space, so we know that one day they'll come back.
The ship reportedly sank so quickly that the crew did not have time to send out an official SOS signal.
Since x t is a SOS signal then the matrices R(t + h,t), h=1,2,…, are independent of t.
Moreover, as x t is also a SOS signal, this model is trivially its WL autoregressive representation.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com