The phrase "a second improvement" is correct and usable in written English.
It can be used when referring to an additional enhancement or upgrade that follows a previous improvement.
Example: "After implementing the first improvement, we noticed further issues that required a second improvement to enhance overall performance."
Alternatives: "an additional enhancement" or "a further upgrade".
A second improvement is the development of feed spacers which have lower pressure drop.
A second improvement would be to change the method that is used to let the player select a level.
Also emphasized is a second improvement important to avoid in practice early convergence to suboptimal solutions instead of local optima.
A second improvement, says Murarka, is that some ARM chips have been built with graphics subprocessors pieces of silicon that are specifically designed to handle the heavy lifting of graphics rendering.
A second improvement could be achieved by a credit card company or an entity like PayPal or Square Cash: Set up the electronic machinery to allow people to easily send conventional money, denominated in baskets, to anyone in the world.
A second Improvement Notice would now follow requiring the council to achieve a satisfactory safeguarding children rating in 12 months time, the council said.
A second improvement--an optical system that counts trapped atoms by measuring fluorescent light emitted by the cesium--has convinced other physicists that the team can catch a single atom.
A third improvement would be to move beyond just one new unit of account to a whole system of them, so that we could have baskets for different purposes.
A third improvement was introduced, which allowed only 10% of the reported d-edges (e.g. if the number of the d-edges are more than 20000 then only 2000 d-edges are selected) to find maximum c-cliques.
Dugan devised a third improvement which helped prevent audio feedback in the presence of sound reinforcement loudspeakers.
The results may differ in later stages of sepsis after a first improvement.
