RÉSUMÉ. Cet article représente une synthèse des résultats de la communauté scientifique dans le domaine de l’horodatage électronique. L’horodatage de documents électroniques est une technique cryptographique permettant de prouver qu’un document a été créé à une certaine date et qu’il n’a pas été modifié depuis cette date. Le développement de systèmes d'horodatage sûrs représente un enjeu import...

The locking compression plate fixation treatment for the unstable sacral fractures is simple and effective, with less trauma and complications. Some locking compression plate parts have been made of high-strength Plate manufactured by hot stamping process since the demand for lightweight biomedical materials. Finite Element (FE) method of One-Step inverse forming based on deformation theory is ...

We introduce a nanoscale stamping technique of sub-10-nm colloidal quantum dot (QD) arrays to highly localized areas of three-dimensional nanostructures using a quartz tuning fork employed as the stamp pad (the "Nano Stamp"). CdSe/ZnS core-shell nanoparticles with diameters of 9.8 nm were deposited on microfabricated silicon probe tips. The number of transferred QDs, which ranged from several t...

Hot stamping process is a high non-linear process showing the effect on thermal, mechanical and metallurgical phenomena as they relate to each other. In order to carry out this coupled numerical simulation, fundamental thermal properties such as interfacial heat transfer coefficient and convection heat transfer coefficient as well as crucial mechanics properties were first investigated. Hot sta...

On the basis of analyzing characteristics of stamping die products and their designing process, a design method combining rough set theory and case-based reasoning is proposed. Firstly, the paper introduces the information system of case-based reasoning based on rough set. Then, the paper presents storage strategies of stamping die case library and implementing examples. In order to retrieve ca...

Figure 1 shows a simplified CAD representation of the tools and initial blank in the stamping process. During stamping, the metal sheet is submitted to large displacements and large elasto-plastic strains; rupture and wrinkles must be avoided, (Figures 2 and 3). The resulting part must also satisfy quality requirements regarding its geometry: after tools removing, the springback effect (Figure ...

We present a solution to the high availability issue that arises when digital time-stamping authority tries providing robust services to its users. High availability of time-stamping services is very important because any suspension of service due to system failure or potential attacks results in serious monetary losses. In this paper, we present a new approach that deploys an RSA threshold sig...

Spacer grid assembly supporting the nuclear fuel rods is an important concern in the design of structural components of a Pressurized Water Reactor (PWR). The spacer grid is composed by springs and dimples which are formed from a strip sheet by means of blanking and stamping processes. In this paper, the blanking process and tooling parameters are evaluated by means of a 2D plane-strain finite ...