1. Active systems are rarely used, as doing so reveals the sub's presence.2. A Building Management System is used to control the active systems . 3. Ninety percent of the students have active system accounts, he said. 4. This was the first pedestrian detection feature for an active system . 5. The active system must be used in conjunction with the passive received system. 6. System components can be active or passive . "'Agents "'are active system components. 7. Therefore, active systems need less readers ( or decoders ) per timing point width. 8. A more active system moved into the Northwest, bringing showers to Idaho, Washington and Oregon. 9. The standby system copied data from the active system to minimize switchover time if needed. 10. The low frequency active system is currently being deployed on the USNS " Impeccable ".