The phrase "constant by" is not a correct phrase in Standard English
You could use the phrase "constant in" instead. Example: She was constant in her efforts to improve her skills.
So, change in fashion is constant, by necessity.
In a variant of that method, the deflection of the balance is maintained constant by a servo control.
We all know it's possible to lower tax rates and keep revenue constant by reducing deductions and loopholes.
Maximize the constant by taking (alpha :=(n+2k-2)/2).
The variation in lattice constant by hydrogen occupation was investigated.
Strawboard density was held constant by controlling the gap in the press mold.
It also increased; the absorption ratio and the values of dielectric constant by ~ 3 times.
The temperature was maintained constant by alternating saline concentration with different electric field intensities.
Incubation is intermittent initially, becoming constant by the time the third or fourth egg is laid.
"This is analogous to a swimming pool, in which water levels are kept constant by the water-recycling system.
The bill is notorious as an attempt to establish a value of scientific constant by legislative fiat.
