Understanding the deformation mechanism and behaviour of adjacent tunnels subjected to dynamic train loads provides vital technical insights for engineering design. This study conducted a detailed analysis and revealed that tunnel excavation significantly affects the stability of adjacent existing tunnels under dynamic loads. First, we developed a dynamic load simulation approach and derived a calculation formula for shield-soil friction.
View Article and Find Full Text PDFDuring fetal development, primordial oocytes maintain their developmental potential through a ROS-minimizing metabolic mechanism. Maturation increases ROS levels, causing stress and damage, which are countered by in vivo antioxidants. In vitro maturation (IVM) worsens this due to fewer antioxidant presence and medium factors.
View Article and Find Full Text PDFObjective: To investigate the effects of Baohe pills on intestinal microorganisms and enzyme activities in mice with a high-fat and high-protein diet.
Methods: 45 KM male mice were randomly divided into the control group, the high-fat and high-protein diet group, and the Baohe pill intervention group. The mice in the high-fat and high-protein diet group and the Baohe pill intervention group were fed with the self-made high-fat and high-protein diet as the sole food source of the mice, and the mice in the control group were fed with the normal diet.
Proc Inst Mech Eng H
November 2019
Enamel grinding is a critical dental surgery process. However, tooth damage during the process remains a significant problem. Grinding forces, burr wear, and surface quality were characterised in relation to grinding speed, enamel orientation, grinding depth, and burr grit grain size.
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