"at a specific ratio" is correct and usable in written English.
You can use it when you need to identify an exact proportion or comparison between two things. For example, "The ingredients must be mixed at a specific ratio of 1 part sugar to 3 parts water."
In the steady-state method, two immiscible fluids are injected co-currently at a specific ratio through the core until the same production ratios are achieved from the outlet of the core.
This is because the preferred has a call option-like feature that gives buyers the right to "convert" their shares to the common stock of the underlying company at a specific ratio, depending on the price of the common stock at the time.
The largest aggregates formed at a specific ratio of BSA to PAH were shown to be electrically neutral.
In both cases the substrate conversion time has a minimum at a specific ratio of the concentrations of the individual enzymes.
In this case the broad maximum corresponds to about f− = 0.45, but the isoelectric point is found at a specific ratio, i.e., f− = 0.37.
The functional and locational significance of NS5A p56 and p58 remains unclear; however, maintenance of these two forms at a specific ratio is critical for HCV replication.
The interaction of ADSCs and HSC-progenitors along with AT-ECs in a specific ratio could lead to the conditioning of each other for more efficient secretion of soluble factors, thereby increasing the healing potential of the injected cells.
High density polyethylene (PEHD) and isotactic polypropylene (iPP) blends exhibit a maximum in impact strength at a specific mixing ratio.
NPs prepared by the emulsion-solvent evaporation technique displayed a hydrodynamic diameter of ⿿ 200 nm, a negative zeta potential (⿿ ⿿27 mV) and a satisfactory entrapment efficiency of both drugs at a specific mass ratio.
The overall photocatalytic oxidation activity of As III) was optimized at a specific mixing ratio of catalysts (mCN WO3 = 60 40) where there is an optimal balance between the conduction band electron transfer to dissolved O2 (to produce H2O2 on mCN) and the competing electron transfer to Fe3+ (to regenerate Fe2+ on WO3).
The elution test was carried out at a specific S/L ratio and at varying time (from 5to9090 min) to determine the effect of elution time.
