The phrase "affects positively" is grammatically correct and can be used in written English.
Example: The new management strategy greatly affects the company's performance positively.
It certainly affects, positively or negatively, your perception of a performance.
The results suggest that the presence of patterned wells affects positively cell adhesion, morphology and proliferation.
In the temperature range examined, steam affects positively char and gas properties.
That the level of job satisfaction of teachers is very high affects positively the educational aims come true.
In this case, each sphere is surrounded by a gas liquid mixture, which has a lower homogeneous density, thus increasing the particle terminal velocity, which in turn affects positively the mass transfer coefficients.
Results show that technological relatedness affects positively both the intensity and relevance of the technological progress of European regions and that the other components of the knowledge space show a different impact on the two features of the technological progress.
Favorable combinations of diffusion and sorption coefficients can affect positively the reactor's conversion.
These business leaders are affected positively both individually and collectively and have increased personal and professional growth.
Multistarter fermentation affected positively the varietal organoleptic traits of the fermented CGM.
We hedge all of our price risk so whether the price goes up or down it doesn't affect positively or negatively on our results.
Evaluation takes place in full view of the communities whose lives are affected positively or adversely by the performance of their leaders.
