Volume Recovery Method for Non-Seal Gas Pressure Measurement Technology: A Comparative Study.

Coal seam gas pressure is one of the basic parameters for coalbed methane resource exploitation and coal mine gas disaster prevention. However, the present coal seam gas pressure measurement technology requires harsh field measurement conditions and a long testing period. In this study, a novel non-seal gas pressure measurement technology is proposed, and this technology is mainly aimed at three different changes before and after the collection of coal samples and realizes the real gas pressure measurement through the compensation of gas leakage, in situ volume recovery of the coal core, and reservoir temperature simulation.

[Effect of electroacupuncture of quintuple needling combined with adductor relaxation method for osteonecrosis of the femoral head].

Objective: To compare the clinical effects on osteonecrosis of the femoral head between the comprehensive therapy (electroacupuncture ［EA］ of quintuple needling combined with adductor relaxation method) and the adductor relaxation method.

Methods: Eighty patients with osteonecrosis of the femoral head were randomly allocated into a treatment group and a control group, with 40 patients in each group. The patients in the control group were treated with the adductor relaxation method.