Risk-Adaptable Access Control (RAdAC) This paper considers the impediments of traditional access control approaches to sharing of. information. It describes a concept for an access control model that emulates real world decision-. making, considering operational need and security risk as part of each access control decision, and.
Turbulence can occur in the lowest part of the troposphere during the daytime when heating of the sun causes convective mixing of the air. Once the airplane rises above this turbulent boundary layer, the air becomes smoother. But other processes can also cause these up- and down-drafts.
That's just the rules of the road.. While the worst turbulence occurs in the middle of a stormâtypically between 12,000 to 20,000 feetâstorms and the turbulence they create can rise as high as 50,000 feet, well above the 30,000 to 40,000-foot ceiling of most airliners.