A family of RBAC-based workflow authorization models, called RWAM, are proposed. RWAM consists of a basic model and other models constructed from the basic mode
The defect properties in as-grown and deformed p-type GaAs with different concentration of dopants and different growth method have investigated by positron lif
The pollution source and pollution state of surface water is respectively assessed with equal-standard-pollution-load index and Nemero index, and the habitans&#