Pipelines are an important way of transportation for gas, oil and other petroleum products, and they are typically exposed to a harsh environment, leading to corrosion defects, cracks, leakage, dents and so on. A composite repair system is a favourable repair system for defective pipelines owing to its high strength, lightweight, cost-effectiveness, elimination of explosion and so on. Considerable research has been carried out on the composite repaired pipelines. However, there are still many issues and challenges to overcome in order to improve the existing repair designs. Therefore, this paper aims to review the theoretical analysis method for pressurized composite repaired pipelines. A better understanding of the mechanisms of stress distribution will benefit the development of composite repaired pipelines. They are mainly summarized into three models, namely the one-layer model, two-layer model, and three-layer model, which are all based on the thin-walled theory and the Lame approach. Both the advantages and disadvantages of these theoretical models are highlighted. Finally, in the conclusion section, the current research gap and future scopes of study in the theoretical analysis are also presented to provide insight into a more effective design philosophy for composite repaired pipelines.
Introduction: In this study, the acceleration time-history curve of blasting vibration is obtained at different explosion distances in different amount of explosion with MATLAB analysis software to determine the dynamic response of mining blasting vibration to surrounding reinforced concrete (RC) frame structures.
Cerebral palsy is the most common motor disability of childhood. Spastic cerebral palsy accounts for 60% to 70% of cases. Research has shown that acupuncture can improve the quality of life of children with cerebral palsy, but the mechanism of action remains unclear. This study aims to determine the effectiveness of acupuncture for treatment of children with spastic cerebral palsy and to assess the value of multimodal magnetic resonance imaging (MRI) and ambulatory electroencephalogram (EEG) for evaluation of treatment effect.
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