The phrase "an efficient one" is correct and usable in written English.
It can be used to refer to a person, method, or object that performs effectively and with minimal waste of resources.
Example: "After evaluating several options, we decided that this solution is an efficient one for our needs."
Alternatives: "a productive option" or "an effective choice."
An effective R&D system is an efficient one, but reengineering the system in the way we know is possible requires support, and with funding at critically low levels, the ripple effects could be devastating.
In addition, the state of California is considering setting minimum energy efficiency standards to make sure every model sold there is an efficient one.
A possible approach could be to create "Warrior Transition Units" which are focused solely on ensuring a service member has a successful transition, not just an efficient one, and these units would be every separating service member's last duty assignment; a required, legitimate part of every service member's military career.
Using drones would be a new method, but an efficient one.
Mr. Bush was known as a quick study -- not a very deep thinker, but an efficient one.
If this option has proved to be an efficient one, it is, however, a costly solution.
Complex multiphase waste system purification, as one of the major challenges in many industrial fields, urgently needs an efficient one-step purification method to remove several pollutants simultaneously and efficiently.
An efficient removal of homocysteine is a prerequisite for an efficient one-carbon metabolism, by which arsenic is methylated.
Therefore, an efficient One-Shot Sparse Polynomial Chaos Expansion (OS2-PCE) based process design framework is introduced in this work.
We report an efficient one-step approach to reduce and functionalize graphene oxide (GO) during the in situ polymerization of phenol and formaldehyde.
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