First, our survey covered only one year, and it is possible that attrition trends may vary over years.
For example, the iron content of rhodochrosite (MnCO3) may vary over a wide range.
Does it anticipate and respond to needs that may vary over time?
A pair of astronomers has found evidence that dark energy may vary over time.
Systems for processing continuous monitoring queries over data streams must be adaptive because data streams are often bursty and data characteristics may vary over time.
If confirmed, this result shows that dark energy may vary over time, giving an important clue as to what it is and how it affects the Universe.
Mode transition is an important control challenge for dual fuel engines, particularly for marine applications where fuel quality and composition may vary over a wide range.
The workload type, for example, is a key to tuning a DBMS and may vary over the system's normal processing cycle.
Time-dependent routing amounts to design "best" routes in a graph in which arc traversal times may vary over the planning horizon.
Also, a firm's political risk may vary over time as the host country's policy priorities change, particularly the policies which favor some industries over others.
This question was examined in the context of a flexible planning process where the size of a conservation portfolio may vary over time.
