Because of theinfluence of wind in creating current, there is a relationshipbetween this oceanic circulation and the general circulationof the atmosphere. The oceanic circulation is shown on thechart following this page (winter N. hemisphere), with thenames of the major ocean currents.
Radiological Dispersion Device. Terrorist use of a Radiological Dispersion Device (RDD) â often called âdirty nukeâ or âdirty bombâ â is considered far more likely than use of a nuclear explosive device. An RDD combines a conventional explosive device â such as a bomb â with radioactive material.
A Logical DFD visualizes the data flow that is essential for a business to operate. It focuses on the business and the information needed, not on how the system works or is proposed to work. However, a Physical DFD shows how the system is actually implemented now, or how it will be.