"unknown arrival" is correct and usable in written English
You can use it in a sentence to describe a situation where somebody or something has appeared unexpectedly or without prior warning. For example, "The small town was taken aback by the unknown arrival of the circus caravan."
Though some have speculated that the skeleton is a relic of an otherwise unknown arrival of Europeans, a simpler explanation is that American Indians evolved very rapidly, Dr. Ayala said.
Nonetheless, for unknown arrival distribution traffic such as live video, the system should be adaptively adjusted for each SI.
To further improve our estimation, we use Kalman filtering based on the dynamics of the system for both known and unknown arrival distribution.
The admission controller can thus be interpreted as a mechanism which transforms the unknown arrival process governing the number of vehicles entering the network to a regulated process, such that prescribed QoS requirements on travel time in the network and upper bound on the external queue are satisfied.
(Survey Respondent 271, unknown arrival year).
For reasons which are yet unknown, the arrival of Homo sapiens in a region was always quickly followed by the disappearance of Neanderthals.Dr Paabo had announced that he had the Neanderthal genome in February 2009, at a meeting of the American Association for the Advancement of Science.
The wheel remained unknown until the arrival of Europeans, although there is reason to think that a turntable, or slow wheel, may have been used occasionally.
The shortest time delay decile (≤6 minutes) was excluded from the analysis as this usually represents cases where hypotension existed for an unknown period before arrival in the emergency department.
For the purpose of the empirical estimation, we design categories for years since migration so that the uppermost category includes all individuals arriving prior to 1973, where the exact year of arrival is unknown.
I believe that it is time to follow a new track in which ordinary people lead the process and not just sit back and wait for their ineffective leaders to do something or wait for the arrival some unknown saviour.
Everything about City Center's two-week Fall for Dance festival combines to make it a hit: the $10 seats; the variety of each program; the judicious mixture of celebrated and relatively unknown artists; and its arrival just as the college term, the dance-performance season and fall itself are all getting under way.
