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A subatomic particle, located in the nucleus of atoms, having a positive electronic charge and a mass of 1.

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SOLID STATE HALOGEN LEAK DETECTOR

An electronic leak detector for all halogen-related refrigerants.

ATOMIC ABSORPTION SPECTROSCOPY

Measures the radiation absorbed by chemically unbound atoms by analyzing the transmitted energy relative to the incident energy at each frequency. The procedure consists of diluting the fluid sample with methyl isobutyl ketone (MIBK) and directly aspirating the solution. The actual process of atomization involves reducing the solution to a fine spray, dissolving it, and finally vaporizing it with a flame. The vaporization of the metal particles depends upon their time in the flame, the flame temperature, and the composition of the flame gas. The spectrum occurs because atoms in the vapor state can absorb radiation at certain well-defined characteristic wave lengths. The wave length bands absorbed are very narrow and differ for each element. In addition, the absorption of radiant energy by electronic transitions from ground to excited state is essentially and absolute measure of the number of atoms in the flame and is, therefore, the concentration of the element in a sample.

SOLU-BRIDGE

An electronic instrument used to measure conductivity of a water sample to determine the dissolved solids content.

ENC

Electronic Navigational Chart

KALMAN FILTERING

A statistical method for estimating the parameters of a dynamic system, using recursive techniques of estimation, measurement, weighting, and correction. Weighting is based on vari- ances of the measurements and of the estimates. The filter acts to reduce the variance of the estimate with each measurement cycle. In navigation, the technique is used to refine the positions given by one or more electronic systems.

COSMOS

A Belgian electronic computer logistic system used at the SA container terminals.

COLLISION AVOIDANCE SYSTEM

An electronic system commonly used to prevent collisions in inland navigable waterways.

ELECTRONIC DATA INTERCHANGE

The exchange of information through an electronic format. Electronic commerce has been under intensive development in the transportation industry to achieve a competitive advantage in international markets. (EDI)

EDI

The exchange of information through an electronic format. Electronic commerce has been under intensive development in the transportation industry to achieve a competitive advantage in international markets.

AID TO NAVIGATION

A device or structure external to a craft, designed to assist in determination of position, to define a safe course, or to warn of dangers or obstructions. If the information is transmitted by light waves, the device is called a visual aid to navigation; if by sound waves, an audible aid to navigation; if by radio waves; a radio aid to navigation. Any aid to navigation using electronic equipment, whether or not radio waves are involved, may be called an elec- tronic aid to navigation. Compare with NAVIGATIONAL AID, meaning an instrument, device, chart, method, etc., intended to assist in the navigation of a craft.
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