nouns - Verb after preposition


Is it correct to write this: "... rely on emulating techniques"? I must write the emulate verb in gerund because it is preceded by an preposition, right?


The whole sentence is:



These systems usually rely on emulation techniques, such as interpretation and dynamic binary translation, to execute guest application code.



Isn't it true that always that a verb appear after a preposition the verb must change to gerund form?




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