Introduction: The exact measurement of the root canal length is of great importance in root canal therapy. Although, determination of the root canal length through radiography is the most common method, recently electronic apex locators are being used to determine working length and decrease the number of radiographs. The purpose of this study was to compare the accuracy of an electronic apex l...

Abstract Accurate quantification of external force is the key to improve high-precision hemming autobody closure panels. However, mechanism on forming quality complex contour sheet metal with adhesive not clear subjected geometric curvature and materials. In present study, taking curved edge aluminum as research object, SPH (smooth particle hydrodynamics) introduced simulate viscous adhesive, S...

We present a new mimetic finite difference method for diffusion problems that converges on grids with curved faces. Crucially, it gives symmetric discrete problem uses only one unknown per face. The principle at the core of our construction is to abandon standard definition local consistency methods. Instead, we exploit novel and global concept P0-consistency. Numerical examples confirm optimal...

To solve the problem of critical buckling in the structural analysis and design of the new long-span hollow core roof architecture proposed in this paper (referred to as a "honeycomb panel structural system" (HSSS)), lateral compression tests and finite element analyses were employed in this study to examine the lateral compressive buckling performance of this new type of honeycomb panel with d...

We show that almost nonnegatively curved m -manifolds are, up to finite cover, nilpotent spaces in the sense of homotopy theory and have C(m)-nilpotent fundamental groups. We also show that up to a finite cover almost nonnegatively curved manifolds are fiber bundles with simply connected fibers over nilmanifolds.