See Primary Sampling Unit
Primary Sampling Unit. A Primary Sampling Unit is a collection of secondary sampling units that we select in the first stage of a two-stage sampling design. In two-stage sampling, we first select a PSU, then select secondary sampling units within each selected PSU.
practical salinity unit. Used to describe the concentration of dissolved salts in water, the UNESCO Practical Salinity Scale of 1978 (PSS78) defines salinity in terms of a conductivity ratio, so it is dimensionless. Salinity was formerly expressed in terms of parts per thousand (ppt) or by weight (parts per thousand or 0/00). That is, a salinity of 35 ppt meant 35 pounds of salt per 1,000 pounds of seawater. Open ocean salinity is generally in the range from 32 to 37.
Primary Sampling Unit. A primary sampling unit (PSU), as defined by NORC, is composed of either a single county (or the equivalent), a group of counties, or an SMSA and is based on population and area constraints.
Police Standards Unit (a unit within the Home Office)
An area of land, typically square to rectangular in shape, that is approximately 40, 100, 160, or 640 acres in size. Within the PSU, sample points are assigned. Certain data elements are collected for the entire PSU, while others are collected at the PSU points. The size of the PSU is based on the shape, size, and complexity of the resources being inventoried. In 34 states, PSU's are often 160-acre square parcels measuring 0.5 mile on each side. In the western United States, PSU's are often 40-acre or 640-acre square areas; the 40-acre units are used in most irrigated areas, and the larger PSU's are used in relatively homogeneous areas containing large tracts of rangeland, forest land, or barren land. In the 13 northeastern states, PSU's are defined to be 20 seconds of latitude by 30 seconds of longitude, ranging from 97 acres in Maine to 114 acres in southern Virginia. In Louisiana and parts of northwestern Maine, PSU's are 0.5 kilometer squares (61.8 acres).
Programme Support Unit. See BEC.
Primary Sampling Unit. A sampling unit selected at the first stage in a multistage area probability sample. A PSU typically consists of one to several contiguous counties—for example, an MSA with surrounding suburban counties.
Professional Standards Unit, succeeded by the Professional Ethics Office (PEO)
Parti Socialiste Unifié (United Socialist Party – a centrist formation)
Supplies power to devices as required and helps to keep PC cool
Power Supply Unit. See power supply.
short for "Power Supply Unit".
Also known as the Power Supply Unit, the PSU supplies electricity to all of your systems components
Power Supply Unit - Hardware that supplies electrical power to the computer.
(Practical Salinity Units): The modem units of salinity; very approximately the same as per mille (0/00) or parts per thousand or grams of salt per kilogram of seawater.
Power Supply Unit.........a box which accepts line voltage, and converts it to the correct electrical supply for the Instrument.
Power Supply Unit. The thing that converts the AC current from the wall socket to what ever flavor the device wants, so it will work.
Power Supply Unit. A generic term for a device which is used to supply elcetrical power.
Power Supply Unit. All Control Panels have a PSU usually rated at 1.0 Amp. This is normally sufficient to supply around 15 powered detectors (PIRs, Vibration Detectors) and two sounders. If extra power is required a separate PSU can be added.
Power Supply Unit - The power in your wall is AC which is too chaotic for computers to work. The PSU is responsible for changing the power to DC and cleaning it so that your computer (or XBOX) can have a stable supply of energy.
Power Suppy Unit - The powersupply supplies electricity to the motherboard, device drives and any other peripherials in the computer. [image
Primary sampling unit. Groups of image pixels which are relatively homogeneous with respect to spectral variations and are large enough to allow for registration errors to the ground, map or photograph.
Abbreviation for practical salinity units. See salinity.
