Specification of multiparty audio and video interaction based on the Reference Model of Open Distributed Processing

The Reference Model of Open Distributed Processing (RM-ODP) is an emerging ISO/ITU-T standard. It provides a framework of abstractions based on viewpoints, and it defines five viewpoint languages to model open distributed systems. This paper uses the viewpoint languages to specify multiparty audio/video exchange in distributed systems. To the designers of distributed systems, it shows how the concepts and rules of RM-ODP can be applied.\ud \ud The ODP ¿binding object¿ is an important concept to model continuous data flows in distributed systems. We take this concept as a basis for multiparty audio and video flow exchanges, and we provide five ODP viewpoint specifications, each emphasising a particular concern. To ensure overall correctness, special attention is paid to the mapping between the ODP viewpoint specifications

Microstructure of particle-strengthened materials. A study on Ni-base superalloys and Al-Li base alloys

The theory of order hardening is used to calculate the contribution to the shear stress of a superlattice dislocation in a binary AL-Li alloy with 2.9 volume percent of small 6'(L1 21 Al 3 Li) precipitates (R = 7.2 nm). The measured increase of yield stress is in reasonable agreement with the calculated value. From the separation of a superlattice dislocation the APB energy of Al 3 Li is calculated to be 139 mJ/m2. Orowan looping occurs around larger 6' precipitates with radius 68 nm (4.5 volume percent). In commercial Al-Li base alloys the effect of Zr, Cu and Mg has been described and composite precipitates (Zr-rich core, 6' shell) are analyzed by EDS. ... Zie: Summary