The phrase "active simultaneously" is correct and usable in written English.
It can be used to describe two or more actions or processes occurring at the same time.
Example: "The two systems can operate active simultaneously, ensuring maximum efficiency in the workflow."
Alternatives: "functioning at the same time" or "operating concurrently".
Radiocarbon dates document that the three valleys were active simultaneously.
The strengthening of synaptic connections when the presynaptic and the postsynaptic neuron are active simultaneously, which is often summarized as 'cells that fire together, wire together'.
All stimulating electrode pairs were active simultaneously and anodal or cathodal stimulation was applied for 50 50 s (5 V intensity).
Currently I am studying theoretical characteristics of the sensitivity of MEG and EEG sensor arrays and the cancellation of signals when multiple brain areas are active simultaneously.
We aim at the scenarios where a large number of small tenants are served but only some of them are active simultaneously.
Such drifts, together with the observation that several drifts were often active simultaneously, indicate that flow patterns were complex and involved multiple pathways.
Douglas is a prolific trumpeter, composer, educator and entrepreneur from New York City known for the stylistic breadth of his work and for keeping a diverse set of ensembles and projects active simultaneously.
Results suggest that cooler light exposure improves the cognitive system's capacity to deal with multiple task representations, which might remain active simultaneously without interfering with each other, and visuo-spatial ability, producing fewer errors in the mental rotation of 3-D objects.
Every moment ten traffic sources are active simultaneously.
Interpretation goes one step beyond that because the two languages are active simultaneously.
At no time there was more than two reported attackers who were active simultaneously.
