The phrase "have a impact" is correct and usable in written English.
It could be used in a sentence like: "I hope my words will have a impact on the way people view this issue."
The rulings will have a impact far beyond Iraq.
The purpose of this paper is to review the concepts pertinent to drug removal by hemodialysis and discuss the issues related to these new dialysis techniques and how they may have a impact on drug removal and the design of dosing regimens.
Now, if the difference in temperature between us and the Arctic decreases, then that's going to have a impact on the wiggliness of the jet stream.
In our work, we are concerned with the satisfaction of the NFRs since they have a impact on the system's behavior.
Hence, the system should monitor the properties over the world that are dynamic and have a impact on system's behavior namely contextual elements (see Section 2.1).
Surgical tumor reduction has been shown to have a impact on survival and quality of life and, thus, has to be as extensive as possible [ 1, 3- 5].
