The phrase "a simultaneous increase in" is correct and usable in written English.
It can be used when discussing two or more events or phenomena that occur at the same time and result in an increase in a particular variable or metric.
Example: "The study found a simultaneous increase in both temperature and humidity levels during the summer months."
Alternatives: "a concurrent rise in" or "an overlapping growth in".
Our results in guinea pig model show a distinct association of enhanced protection with an increased level of interleukin (IL 12 and a simultaneous increase in immuno-regulatory cytokines such as transforming growth factor (TGF β and IL10 in lungs.
Further, we predict that antiphase cycles will show prey peaks consisting of highly defended prey, and/or a simultaneous increase in prey biomass and defense.
Optimization of the culture cultivation conditions in POME resulted in a simultaneous increase in biohydrogen production and COD reduction.
It is very possible (probable in fact) that we will face a peak in conventional oil output with a simultaneous increase in total liquid fuel availability.
A simultaneous increase in strength and ductility is achieved following heavy warm rolling and subsequent annealing for 1 to 2 h at 873 K.
In this system, the attached long "spikes" create a continuous phase that contributes to a simultaneous increase in tensile stress, relaxation modulus and fracture resistance.
Results showed that conversions from gravity to pressurised irrigation methods reduced water application, but there was a simultaneous increase in energy consumption in surface irrigation areas.
In contrast, in this investigation a simultaneous increase in the yield stress and ductility (elongation) was achieved by considering a larger number of influencing parameters.
A simultaneous increase in the ion adsorption rate led to a ∼40% reduction in the energy consumption as compared to an uncoated ACC electrode.
Dublin is undergoing a simultaneous increase in homelessness and a mini property boom.
Of the three, only Dynegy saw a simultaneous increase in profits.
