The matrix product method ~MPM! has been used in the past to generate variational Ansätze of the ground state ~GS! of spin chains and ladders. In this paper we apply the MPM to study the GS of conjugated polymers in the valence bond basis, exploiting the charge and spin conservation as well as the electron-hole and spin-parity symmetries. We employ the U-V-d Hamiltonian, which is a simplified v...

A product development system (PDS) is based on two pillars: "do the thing right" and "do the right thing". While the former leads to operational efficiency and waste reduction, the latter guarantees the fulfillment of all stakeholders needs. On this context, Toyota's PDS has a superior performance. The lack of formalization of the Toyota PDS system, though, makes it difficult to replicate. Rese...

Starting from the framework of Product Lifecycle Management (PLM), sustainability should be provided by continuous sharing of information among the different product lifecycle phases. A PLM system provides lifecycle knowledge generated by PLM systems through product lifecycle activities. The paper aims at presenting how PLM systems represent a very important foundation for achieving a more sust...