Formula_11405

\[\frac{\partial F_{s}}{\partial x_{1}}+\frac{1}{Q} \frac{\partial U_{s}}{\partial x_{1}} F_{s}+\frac{1}{Q} \frac{1}{v} \int \frac{\partial \Phi\left(\left|\boldsymbol{r}_{i}-\boldsymbol{r}_{s+1}\right|\right)}{\partial x_{1}} F_{s+1} d \boldsymbol{r}_{s+1}=0\]