Rock roadway complementary support technology in Fengfeng mining district

This paper takes No.52 return uphill roadway of Yangquhe coal mine as a research project. Based on the research, especially its geological condition, indoor experiments, numerical simulation and theoretical analysis were employed to determine the difficult coefficients of Yangquhe project. By using these means,the difficult coefficients of the deep rock engineering were determined. From a study of the effects of crustal stress and the roof mechanism on roadway stability, the transformation mechanism in Yangquhe coal mine has been determined. As a result of this research, the interactive support technology of prestressed cable mesh was developed and the technology tested in mining engineering, which proved to be feasible.

Drawing the Yongquan protocol into the different stages of the cardiopulmonary resuscitation sequence

AIM: To introduce new applications into the ILCORcardiopulmonary resuscitation(CPR) "chain" sequence.METHODS: Stages of the CPR sequence("chain"): prior to the application of chest massage: assess the victim's state of consciousness and lung-heart failure;seek help(call 911), or in situations in which it is impossible to start the ILCOR protocol:(1) if the victim is trapped in car crash, overturned car, landslide, massive number of victims or catastrophe; or(2) delayed CPR.During chest compression: Yongquan is simultaneously stimulated by a third rescuer. During defibrillator application: activate K-1 Yongquan through needles before defibrillation. Unsuccessful CPR: "gold standard"for legal clinical death.RESULTS: Implies comparing two hypotheses: Ho(null hypothesis) demonstrates no association between the two variables studied; Ha(alternative hypothesis) implies some degree of relation between them. Difference between the two treatments is observed. If it is greater than the standard error multiplied by a coefficient of security, the difference is significant: Ha will be accepted and Ho rejected. First we will compare CPR without defibrillator(method "A") and K-1 Yongquan method(method "B"), using percentages of representative samples(treatment "A": 6.4% response, treatment "B": 85% response). If │PA- PB│ is greater than the product of 1.96 times the standard error, the difference is significant. Because │PA- PB│ = 0.786 is greater than 0.098, the difference between 0.064 and 0.85 is statistically significant. Thus, we reject Ho and accept Ha as correct. Thus, it is improbable that chance was responsible for this association. This analysis shows that K-1 Yongquan method has a "quality guarantee". Second, we compare defibrillators("A") with K-1 Yongquan method("B")(treatment "A": 48%, treatment "B": 84%, │PA- PB│= 0.36; │PA- PB│ = 0.36 is greater than SE × 1.96 = 0.0148 and also statistically significant, demonstrating again the comparative value of the Yongquan method. CONCLUSION: The Yongquan resuscitation manoeuver is a non-invasive, non-tiring, costless, and easy-toapply procedure that provides a second chance when other options fail.