L clearance - meaning and definition. What is L clearance
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What (who) is L clearance - definition


L clearance         
An L clearance is a security clearance used by the United States Department of Energy (DOE) and Nuclear Regulatory Commission for civilian access relating to nuclear materials and information under the Atomic Energy Act of 1954. It is equivalent to a United States Department of Defense (DOD) Secret clearance.
Active tip-clearance control         
Active clearance control (ACC) is a method used in large aircraft gas turbines to improve fuel efficiency during cruise. This is achieved by setting the turbine tip clearance at more than one operating point and contrasts with passive clearance control which sets it for only one condition and is explained below.
Airway clearance therapy         
TREATMENT THAT USES A NUMBER OF AIRWAY CLEARANCE TECHNIQUES TO CLEAR THE RESPIRATORY AIRWAYS OF MUCUS AND OTHER SECRETIONS
Intrapulmonary percussive ventilator; Airway clearance technique; Huff cough; Autogenic drainage; Airway clearance techniques; Active cycle of breathing; Active cycle of breathing technique; Intrapulmonary percussive ventilation
Airway clearance therapy is treatment that uses a number of airway clearance techniques to clear the respiratory airways of mucus and other secretions. Several respiratory diseases cause the normal mucociliary clearance mechanism to become impaired resulting in a build-up of mucus which obstructs breathing, and also affects the cough reflex.