In a solar energy system, refers to all components other than the collector. In terms of costs, it includes design costs, land, site preparation, system installation, support structures, power conditioning, operation and maintenance costs, indirect storag ...

A direct-vision nephoscope which is constructed in the following manner: a comb consisting of a crosspiece containing equispaced vertical rods is attached to one end of a column eight to ten feet long and is supported on a mounting that is free to rotate ...

A type of disk hardness-gauge, especially useful in relatively soft snow. See disk hardness gauge.

Working Paper

Vessel Traffic Management and Information Services

Winds from the four cardinal points of the compass; that is, north, east, south, and west winds.

Gross National Product: GDP plus the net income accruing from foreign sources.

A device for drying compressed air by means of condensation obtained by over-compression or cooling, absorption, adsorption or a combination of the above methods.

United States Trade Representative.

A segregated structure consisting of alternating nearly parallel bands of different composition, typically aligned in the direction of primary hot working.

See Koschmieder's law.

Personnel Data Decision System.

The coating, usually green, that forms on the surface of metals such as copper and copper alloys exposed to the atmosphere. Also used to describe the appearance of a weathered surface of any metal.

The refrigerating effect in Btu/h produced by the difference in total enthalpy between a refrigerant liquid leaving the unit and the total enthalpy of the refrigerant vapor entering it. Generally measured in tons or Btu/h.

General Agreement On Tariffs and Trade 1994 (now WTO)

The removal of heat from a gas after compression is completed.

Computer-based training

See 'acid.

The usually unfinished space above a ceiling and below a roof.

Peoples Republic of China.(flag)