The phrase "a certain ration of" is not correct; it should be "a certain ratio of." You can use it when discussing proportions or comparisons between quantities in various contexts, such as mathematics, cooking, or statistics.
Example: "In the recipe, you need to maintain a certain ratio of flour to sugar for the best results."
Alternatives: "a specific proportion of" or "a defined ratio of."
Briefly, oligomannuronate was mixed with propylene oxide at a certain ration, and the reaction was catalyzed by NaOH at 45°C for 3 h.
Unlike the previous works, where the TFPC/PC involved electrolyte was simply estimated at a certain volume ration and recognized as an unfavorable system, in this work, the physical properties of the electrolyte solutions with a series of volume ratios of TFPC/PC and their electrochemical performances in a graphite/Li cell and 5 V LiNi0.5Mn1.5O4/Li cell have been systematically studied.
Military chaplains were rationed a certain amount of chocolate: "Chaplain of a brigade shall be entitled to draw only six galons of Rum, either four pounds of Coffee or Chocolate... monthly".
Conservatives would encourage people to self-ration, by putting a certain number of health care dollars directly in their hands and leaving the rest to market forces.
And so the young government of Mohamed Morsi has announced a new rationing scheme: Egyptians will each be allocated a certain amount of fuel at subsidized prices; beyond that they will have to pay market price.
Point rationing assigns a point value to each commodity and allocates a certain number of points to each consumer; this system is employed during periods of critical and increasing shortages when individuals begin substituting unrationed for rationed items, thereby spreading shortages.
In these situations, a personal carbon-rationing system, linked to national CO2 emissions targets, will allow individuals to emit a certain amount of greenhouse gases into the atmosphere.
A certain type of author.
