The phrase "a significant narrowing of" is correct and usable in written English.
It can be used when discussing a reduction or limitation in scope, options, or possibilities in various contexts, such as research, policy, or analysis.
Example: "The recent policy changes have led to a significant narrowing of available funding for small businesses."
Alternatives: "a considerable reduction in" or "a substantial limitation of".
David Carter, a spokesman for Aetna, said the company regarded the ruling as "a significant narrowing of the plaintiffs' claims".
Although the rebalancing towards net exports is taking some time, we have seen a significant narrowing of the trade deficit in the first half of this year".
A YouGov poll published in the Evening Standard today showed a significant narrowing of the gap between Labour's Ken Livingstone and the Conservative, Boris Johnson.
Ms. Bair said the proposed regulation "represents a significant narrowing of the discretion provided under Dodd-Frank for differentiation among creditors, consistent with the law's overarching public policy objective to maximize market discipline and make clear that all equity and unsecured debt holders are at risk".
Nevertheless, we observed a significant narrowing of the vertebral canal and a vertebral-rib malformation at the apex of the kyphosis (Fig. 3a).
The transition from the amorphous to the crystalline state leads to a significant narrowing of the phonons and to a shift of peak positions towards higher wavenumbers.
The dilemma the Obama administration faced is that any significant narrowing of the detention authority would likely lead directly to numerous court rulings ordering the immediate release of Guantánamo detainees.
Furthermore, the FF devices of Pt/CFO-3/Pt structures showed a significant narrowing in the range of the V SET as compared to the FR devices.
There is a significant narrowing in the range of values giving a good fit, for the interaction between r c and μ2 as well as for the ratio between μ2 and σ2.
Ex situ hydrogen annealing at a much lower temperature of 350°C, however, results in an overall PL intensity increase with a significant narrowing and a small blueshift of the high-energy WL emission due to hydrogen bonding which neutralizes defects and relieves associated strains.
A significant narrowing distal to the end of the tracheostomy tube was observed.
