The application of mine method shallow burying and undercutting in subway tunnel engineering is becoming more significant, but also has its own limitations: the can easily cause subsidence nearby surface, there a security threat to surrounding buildings, instability inside, easy collapse construction tunnels, endangering safety, so ensuring safety becomes key project. By combining examples Heyi...

Undercutting is a fusion welding defect that appears as groove at the weld metal's toe. An undercut discontinuity forms when welding, particularly current applied an extremely rapid rate. It decreases static and fatigue strength of produces stress concentration zone. The height reinforcement, bead's contact angle, undercut's breadth, depth, length, root radius, well other factors, affect factor...

this paper discusses some of the fundamental considerations when managing mining slopes. the goal of management is to reduce all components that contribute to the geotechnical risk and by doing so reduce the risk to as low as reasonably achievable. the techniques and procedures suggested are not exhaustive; they represent a snapshot of some of the practical techniques the author has found usefu...

Let X be a norm curve in the SL(2,C)-character variety of a knot exterior M . Let t = ‖β‖/‖α‖ be the ratio of the Culler-Shalen norms of two distinct non-zero classes α, β ∈ H1(∂M,Z). We demonstrate that either X has exactly two associated strict boundary slopes ±t, or else there are strict boundary slopes r1 and r2 with |r1| > t and |r2| < t. As a consequence, we show that there are strict bou...

Prospective control of walking and running requires perceiving sloping surfaces that can and cannot support these activities. Two experiments on slant perception were conducted, motivated by the notion of geographical slant rather than optical slant, and by an affordance based description of surface layout. In Experiment 1, participants standing on a horizontal surface (the ground) adjusted the...

Among hemodialysis patients, the assessment of dry weight remains a matter of clinical judgment because tests to assess dry weight have not been validated. The objective of this study was to evaluate and validate relative plasma volume (RPV) monitoring as a marker of dry weight. We performed RPV monitoring using the Crit-Line monitor at baseline and at 8 weeks in 150 patients participating in t...