The phrase "accelerated by three" is correct and usable in written English.
It can be used in contexts where you are describing an increase in speed or rate, specifically indicating that something has been increased by a factor of three.
Example: "The process was accelerated by three, allowing us to complete the project much faster than anticipated."
Alternatives: "increased by three" or "boosted by three".
CONSTRUCTION -- The Long Island Expressway fourth-lane construction project should be accelerated by two years.
His second thoughts, which had been quietly taking shape for some time, were accelerated by two other factors.
The IEEE ITS conference has been on the rise for a while, accelerated by four trends transforming transportation: automation, electrification, the shared economy, and data science.
While in Castmatic the pressurized argon shielded arc melting is followed by gravity casting that is accelerated by two atmospheres argon pressure above and one atmosphere vacuum below.
And as they seek to salvage other struggling candidates - they accelerated by two weeks their advertisements for Representative John M. Spratt Jr. of South Carolina - there is no guarantee that Ms. Kilroy will be the beneficiary of those remaining commercials, either.
All patients received thrombolysis using the protocol accelerated by two types of molecules: streptokinase or actilyse.
Nothing has changed; it has only been accelerated by four years.
The fighter, which is due to enter service in 2008, should be accelerated by two or three years, McCarthy said.
James R. Clapper, the U.S. director of national intelligence, told reporters that "as a result of the Snowden revelations, the onset of commercial encryption has accelerated by seven years".
Obviously, metastatic spreading of RAD001-resistant prostate cancer is accelerated by two strategies: (1) by upregulating the α2 expression level (quantitative regulation) and (2) by strengthening the relevance of α2 in controlling invasion (qualitative regulation).
