Abstract Hot forming processes of complex parts with small cavities demand high-performance tools made hardened steels. Their surface can be tribologically modified in order to control the material flow for improving mold filling functional elements. Surface structuring here offers great potential adjusting frictional properties and thus controlling processes. In this study, high-feed milling (...

Abstract Grinding hard-brittle materials like silicon nitride is faced with some challenges, including sub-surface damage, high tool wear, and low grinding efficiency. Ultrashort-pulse laser structuring of hard prior to the process significantly reduces cutting forces temperature increases achievable material removal rate process. These effects are partially due controllable induced damages int...

A liquid-crystal-infiltrated microcavity structure is proposed as a variable-refractive-index material. It has the advantages over previously considered nanostructured materials of having a larger phase-angle change and lower driving voltage. Two-dimensional liquid-crystal director and finite-difference time-domain optical simulations are used to select liquid crystal material parameters and op...

In this paper we investigate how retrieving information can be improved through task related indexing of documents based on ontologies. Different index types, varying from content­based keywords to structured task­based indexing ontologies are compared in an experiment that simulates the task of creating instructional material from a database of source material. To be able to judge the added va...

Material forces govern the behaviour and the evolution of a defect or of an inhomogeneity in a solid material. In elastic materials these forces are associated with the Eshelby tensor, as is known. In structured or micro-structured materials, an Eshelby–like stress can be assembled by following a simple rule. By appealing to this rule, one is able to propose an expression for the Eshelby tensor...

Kerr effect accounts for the change in refractive index of a material with the light intensity and appears in all known optical materials. In this work we analyze Kerr effect in structured superluminal media (e.g some specific types of resonators). We show that Kerr effect in these structures can be cancelled or even reversed (in comparison with the Kerr effect of the material composing the str...

The aim of this paper is to prove that we can achieve a resolution enhancement in detecting a target inclusion if it is surrounded by an appropriate structured medium. The physical notions of resolution and focal spot are revisited. Indeed, the resolution enhancement is estimated in terms of the material parameters of the structured medium.