Nonlinear evolution characteristics and seepage mechanical model of fluids in broken rock mass based on the bifurcation theory.

With the deep extension of coal mining in China, fault water inrush has become one of the major disasters threatening the safety production of coal mine. Based on the control equations of steady state and non-Darcy seepage in fractured rock mass, the multi-parameter nonlinear dynamic seepage equations of fractured rock mass are established in this paper. Based on the nonlinear dynamics theory, the function of the state variable in the system is derived, and the influence of the gradual change of non-Darcy flow factors on the structural stability of seepage system is studied.

Consensus on diagnostic criteria for deficiency syndrome in hypertension: a modified Delphi study.

Objective: To reach consensus on the diagnostic criteria for deficiency syndrome in hypertension (YDSH) patients by a modified Delphi method.

Methods: Our study was consistent with T/CACM 1032-2017. The methodology of RAND/UCLA appr-opriateness was used to develop consensus guidance statements.