In this work, a new method for mesh simpliication and surface reconstruction speciically designed for the needs of CAD/CAM engineering design and analysis is introduced. The method simpliies the original free-form face model by rst constructing restricted curvature deviation regions, generating a boundary conforming nite element quadrilateral mesh of the regions, and then tting a smooth surface...

We investigate how a straight skeleton can be used to approximate a motorcycle graph. We explain how to construct a planar straight-line graph G such that the straight skeleton of G reveals the motorcycle graph of M , for every given finite set M of motorcycles. An application of our construction is a proof of the Pcompleteness of the construction problem of straight skeletons of planar straigh...

We review recent results on Integrable Discrete Geometry. It turns out that most of the known (continuous and/or discrete) integrable systems are particular symmetries of the quadrilateral lattice, a multidimensional lattice characterized by the planarity of its elementary quadrilaterals. Therefore the linear property of planarity seems to be a basic geometric property underlying integrability....

The number of children suffered from autism spectrum disorder (ASD) is increasing dramatically. However, the etiology of ASD is not well known. This study employed mammalian target of rapamycin inhibitor rapamycin to explore its effect on ASD and provided new therapeutic strategies for ASD. ASD rat model was constructed and valproic acid (VPA) was injected intraperitoneally into rats on pregnan...

Iatrogenic mandible fracture is a rare complication of tooth extraction with an incidence between 0.0033–0.0034%. This study retrospectively analyzes total 8 patients who underwent lower molar associated during removal in the period from April 2006 to March 2019. The assessed parameters were age and sex patients, method extraction, side distribution fracture, type extracted tooth, position thir...

Abstract Nowadays, rapid product iterations result in large quantities of end-of-life products. To meet the fast-growing demand for remanufacturing engineering, companies have quickened standardization and industrialization waste dissembling. Two-sided disassembly lines can effectively disassemble large-sized products on both sides lines, parallel multiple simultaneously with fewer workstations...

Triangle meshes have been nearly ubiquitous in computer graphics, and a large body of data structures and geometry processing algorithms based on them has been developed in the literature. At the same time, quadrilateral meshes, especially semi-regular ones, have advantages for many applications, and significant progress was made in quadrilateral mesh generation and processing during the last s...