Search

Gas permeability and the depressurization path are decisive factors affecting the efficiency of gas hydrate reservoir exploitation. However, there was a lack of quantitative studies on the gas permeability and dynamic optimization of real-time depressurization paths under different in-situ conditions. Therefore, hydrate-bearing cores within the core holder were remolded using South Sea clay under different in-situ conditions. Then, the gas permeability was continuously measured using a constant flow rate. Next, a gas permeability model coupling effective pressure, hydrate saturation, and absolute permeability were established. It was used to predict the gas permeability under different in situ conditions, with deviations mainly in the range of 1–2 %. In addition, the optimum outlet pressure and positive outlet pressure range during depressurization under different in-situ conditions were proposed. The real-time gas flow rate of the optimal depressurization path was larger than other depressurization paths. Also, the logic reasoning process for real-time optimal outlet pressure and positive outlet pressure range was given. Finally, the inlet pressure and the optimum outlet pressure were also accurately predicted. None of the predicted values deviated by more than 4 %. The dynamic optimization of the outlet pressure behavior during depressurization can provide some scientific guidance for hydrate development and utilization. [Display omitted] • Permeability model including hydrate saturation, effective pressure was established. • Optimum outlet pressure and pressure range during depressurization were found. • Real-time inlet pressure of the core was accurately predicted. • Real-time optimal outlet pressure and pressure range were accurately predicted. [ABSTRACT FROM AUTHOR]

Using the three-dimensional model of executive function and the I3 theory of aggressive behavior, we examined the mediating roles of inhibition, working memory, and cognitive flexibility in the relationship between impulsivity and both proactive and reactive aggression in adolescents. We recruited 1,462 middle school and high school students in Sichuan Province, who completed the Reactive–Proactive Aggression Questionnaire, the Barratt Impulsivity Scale, the Teenage Executive Function Inventory, and the Cognitive Flexibility Questionnaire. Results showed that impulsivity was positively correlated with both proactive and reactive aggression, and was negatively correlated with the three subcomponents of executive function. The three-dimensional components of executive function in adolescents were negatively correlated with both proactive and reactive aggression. Further, impulsivity directly predicted both proactive and reactive aggression. In addition, all three subcomponents of executive function in parallel mediated the relationship between impulsivity and proactive aggression. However, only inhibition mediated the relationship between impulsivity and reactive aggression. In conclusion, improving executive function may reduce the impact of impulsivity on aggression. [ABSTRACT FROM AUTHOR]