The phrase "also shown that once" is not correct in standard written English.
It appears to be a fragment and lacks clarity without additional context.
Example: "The study has also shown that once the parameters are adjusted, the results improve significantly."
Alternatives: "also demonstrated that when" or "also indicated that once".
In several studies, researchers have also shown that, once covertly activated, an unconscious goal persists with the same determination that is evident in our conscious pursuits.
Studies have also shown that once p38 MAPK pathway is activated, it is capable of damaging antioxidative system that further increases intracellular ROS levels.
They have also shown that once the blocking factor is formed it is helpful in the subsequent pregnancies.
We also show that, once the high-field rate constants for the anodic oxide film have been accurately determined, the local V-maximum can be quantitatively reproduced based only on the evolution of the growth efficiency.
We also show that once students get into the university, those from public schools perform as well as those from private schools.
Miller and Antzoulatos also showed that once the prefrontal cortex learns the categories and sends them to the striatum, they undergo further modification as new information comes in, allowing more expansive learning to take place.
Our findings also show that, once they have started, drug control and the fear of arrest or prosecution have little to do with people's decisions to stop using.
But, as the American College of Emergency Physicians noted in its review of the data, "nearly two-thirds of [ER] visits occur after business hours, when other doctors' offices are closed". The picture painted by CDC data also shows that, once people get to an ER, 39percentt are being seen in 15 minutes or less, and 72percentt in less than an hour.
The report, which is the most comprehensive snapshot of England's housing stock and how people are living in it, also showed that once housing benefit is stripped out of income, average rents are now more than half of average gross pay.
The result also shows that once FER reaches 0.01, any further improvement of FER gives only negligible increase in throughput.
