Electro Discharge Machining (EDM) is a very efficient machining process widely used in manufacturing components of complicated geometry. Based on its nature, i.e. material removal by electric discharge, the process induces thermal stresses that in turn result in generation of wide spread micro-cracks on the surface of the machined part. In this paper the influence of EDM characteristic paramete...

The work aims to study the change rule of surface properties aluminum (Al) alloy after shot peening (SP), and obtain corresponding relationship between material characteristics SP parameters. Firstly, Finite Element Model (FEM) multi-projectile impact Al specimen was established by ANSYS/LS-DYNA (Version: Ansys15.0). Box-Benhnken design method (BBD) used 3-level 3-factor experiment with pressur...

We understand a lot about fiber bundle F → E → B, when F is a vector space and the structure group is a linear group. We can compute their cohomology completely. However, if we consider other bundles, such as bundles with fiber F a manifold, where the structure group is the diffeomorphism group, we know nearly nothing at all. In this article, we discuss surface bundles, which is the first step ...

Three-way receiver operating characteristic (ROC) surface analysis involves the calculation of a volume under an ROC surface (VUS), which is a measure of discriminatory accuracy of 2 diagnostic tests for 3 diseases. Nonparametric methods for calculating VUS and its standard error have been developed. The author presents the code for roc3D, a Mathematica computer program for performing parametri...