The phrase "a direct proportion between" is correct and usable in written English.
It can be used when discussing a relationship where one quantity increases or decreases in direct relation to another quantity.
Example: "There is a direct proportion between the amount of time spent studying and the grades achieved in the course."
Alternatives: "a direct relationship between" or "a proportional relationship between".
There is a direct proportion between the number of traces on SSNTDs and the activity concentration of radon with proportion coefficient that is called calibration coefficient (detection response).
Based on a direct proportion between thickness and time, the three interglacial intervals were determined to be longer than postglacial time by factors of 3, 6, and 8. To convert these relative factors into absolute ages required an estimate in years of the length of postglacial time.
From the public health point of view, our data do not support the consolidated idea of a direct proportion between more sophisticated and costly approaches and better care.
Electron microscopy demonstrated the flake-like rearrangement of nanorods as well as a structure-related growth where a direct proportion exists between atomic packing factor in lattice and aspect ratio.
Moreover, if a pixel in the original dot plot is not placed on top of a pixel in the compared dot plot, the correlation grade will be reduced equally, regardless of the distance between the pixels, while the distance measure will be reduced in a direct proportion to the distance between the pixels.
The results indicated that the deposition rate of coatings had a direct proportion to deposition pressure and GeH4 CH4 flow ratio.
Additionally, we found a correlation between F-actin and RhoA-GTP values; these molecules were related in a direct proportion.
The ELSD generates a signal in direct proportion to the quantity of the analyte present.
A preliminary analysis suggests that such a parameter varies in direct proportion to the inverse of a scale factor.
The research shows that the PM2.5 thermophoresis deposition efficiency is direct proportion to the temperature ratio between the inlet temperature and the water wall surface but is not the temperature difference in the rectangle channel.
