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In information technology, log rotation is an automated process used in system administration in which log files are compressed, moved , renamed or deleted once they are too old or too big (there can be other metrics that can apply here). New incoming log data is directed into a new fresh file (at the same location).
In quantum mechanics, rotational invariance is the property that after a rotation the new system still obeys Schrödinger's equation. That is [please be gentle on the reader and define E and H] [,] = for any rotation R. Since the rotation does not depend explicitly on time, it commutes with the energy operator.
Ehrenfest considered an ideal Born-rigid cylinder that is made to rotate. Assuming that the cylinder does not expand or contract, its radius stays the same. But measuring rods laid out along the circumference should be Lorentz-contracted to a smaller value than at rest, by the usual factor γ. This leads to the paradox that the rigid measuring ...
"Pronouns and any other information not permitted in the policy must be removed from CDC/ATSDR employee signatures by 5.p.m. ET on Friday," according to one such message sent Friday morning to CDC ...
Thomas Detry nearly aced the rowdy par-3 16th hole in a stretch of four closing birdies, shooting a 6-under 65 on Sunday to win the Phoenix Open by seven shots for his first PGA Tour victory. The ...
There will be no Stephen Curry vs. Sabrina Ionescu rematch at All-Star weekend. The NBA announced Thursday that the 3-point shooting event bringing together two of the biggest stars in the NBA and ...
The engineering and robotics communities typically use 3-1-3 Euler angles. Notice that after composing the independent rotations, they do not rotate about their axis anymore. The most external matrix rotates the other two, leaving the second rotation matrix over the line of nodes, and the third one in a frame comoving with the body.
The two-dimensional case is the only non-trivial (i.e. not one-dimensional) case where the rotation matrices group is commutative, so that it does not matter in which order multiple rotations are performed. An alternative convention uses rotating axes, [1] and the above matrices also represent a rotation of the axes clockwise through an angle θ.