A vascular suturing device is disclosed which includes an elongated tubular body defining opposed proximal and distal end portions and having a longitudinal axis extending therethrough, the body including an inner tubular member, an outer tubular member and a central tubular member disposed between the inner and outer tubular members. The system and method includes a user interface, a wireless transceiver, and a controller. For each user, based on membership of a group, or a Boolean evaluation of memberships of two or more groups, a list of accessible resources and permitted operations is generated, and the list is made available for subsequent processes, e. Metal vanadium oxide nanoparticles can be incorporated into a cathode of a lithium based battery to obtain increased energy densities. , a hydrophone, solar power components, and data processing and communications equipment. Cluster analysis techniques are used to analyze the configuration data corresponding to IT assets in the IT asset management system, generating proposed logical groups from the clusters determined by the cluster analysis techniques.