The phrase "a direct relation with" is correct and usable in written English.
It can be used when discussing a clear or straightforward connection between two entities or concepts.
Example: "There is a direct relation with the increase in temperature and the rate of evaporation."
Alternatives: "a direct connection to" or "a direct link with".
Models of asbestos-related mesothelioma carcinogenesis also include a direct relation with average exposure to asbestos fibres, and a term for type of asbestos, with risk apparently higher for amphiboles than chrysotile (Boffetta, 1998).
The kinetic model showed that uranium recovery has a direct relation with ferric ion concentration.
Emulsified asphalt content has a direct relation with IDT at low temperature.
I wanted to feel real empathy and that only comes from experience, from a direct relation with human suffering and human pain, and he didn't have that yet".
The total mean duration of lactational amenorrhea in this study was 6.1 months, and there was a direct relation with the length of exclusive breast-feeding.
On the other hand, all the CDTs depend on a parameter s that has a direct relation with the size of the tree built.
It was found that the corrosion resistances of coated samples has a direct relation ship with the average size of complex carbide-based nanocrystallites.
Several studies suggest a direct relation of HPCs with increased fibrosis development and remodeling [ 85, 86].
The latter was included in the model as it was expected to have a more direct relation with sexually transmitted infections and it may be a risk factor that is modifiable in this setting.
Figure 9b indicates a direct relation of temperature rise with Hc and Ms which means that the generated heat increases by enhancing the hysteresis area, showing an important contribution of hysteresis loss to the generated heat.
This suggests a direct relation of land inheritance with agricultural life style.
