translate English to French: A variety of modifications to this basic process have been investigated, including oscillating pressure, alternating pressure and pulsation processes. None of these has proved sufficiently effective to warrant commercial application in Canada.
Diverses variations sur cette méthode de base (pression oscillante, pression alternative et pulsations) ont fait l’objet d’études; aucune d’entre elles ne s’est avérée suffisamment intéressante pour justifier son exploitation commerciale au Canada.