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SLACspeak Terms

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U Wastes
A federal list of non-acute hazardous wastes.
U.S.C.
United States Code.
UAT
User Acceptance Test. (Computing)
UA1
Underground Area 1. The name of a detector, and the related experiment, at CERN.
UA2
Underground Area 2. The name of an experiment, and the related detector, at CERN.
UA5
UA5 detector at CERN.
UC
UltraCentrifugation.
UCN
UltraCold Neutron
UCP
Unique Continuation Property.
UCPF
Universal Chiral Partition Function
UDP
User Datagram Protocol. A transport protocol in the Internet suite of protocols. UDP, like TCP, uses IP for delivery; however, unlike TCP, UDP provides for exchange of datagrams without acknowledgements or guaranteed delivery.
UEC
Users Executive Committee.
UED
Ultrafast Electron Diffraction.
UEL
Upper Explosive Limit or Upper Flammable Limit (UFL). The maximum percentage of a substance in air which will ignite. See also LEL and Flammability Range.
UEM
Ultrafast Electron Microscopy.
UF
UltraFiltration.
UFC
Uniform Fire Code.
UFC
UltraFast science Center. (Stanford)
UFL
See UEL.
UFVA
Unclassified Foreign Visits and Assignments. (DOE)
UG
Unified Graphics. (Obsolete)
UGC
Uppsala General Catalogue of Galaxies.
UGPS
University Grant Program Subpanel.(DOE and NSF)
UH
Undulator Hall (LCLS).
UHE
Ultra High Energy.
UHECR
Ultra High-Energy Cosmic Rays.
UHF
Ultra High Frequency. Allocated band of radio frequencies from 300 Megahertz (MHz) to 3,000 MHz.
UHV
Ultra High Vacuum. The vacuum condition below about 10 exp (-6) TORR. Storage rings operate two to four orders of magnitude under UHV.
UI
User Interface.
UIC
Underground Injection Control. (from SDWA)
UIMS
User Interface Management System. UIMSes are high-level GUI building tools. On the same underlying data, you can relatively easily create different types of user interfaces. UIMSes are also called GUI builders.
UKQCD
United Kingdom Quantum Dynamics Collaboration.
UL
Underwriters Laboratory.
Ultra High Frequency
See UHF.
Ultra High Vacuum
See UHV.
ULXs
Ultra-Luminous compact X-ray sources.
UML
Unified Modeling Language.
UN/NA
United Nations/North American hazardous materials code.
UND
UNDulator.
UND
UNDer
Underground Area 1
See UA1.
Underground Area 2
See UA2.
Undulator
A permanent magnet, used like a wiggler, to generate more synchrotron light by causing the beam to bend rapidly back and forth.
UNESCO
United Nations Educational, Scientific, and Cultural Organization.
Unibus
A bus system developed by DEC for the PDPs and other DEC computers.
UNID
Of the 271 Gamma-ray sources detected by the EGRET instrument onboard the Compton Gamma-Ray Observatory, 172 are unidentified sources. Possible candidates for these sources include active galactic nuclei, pulsars, supernova rem nants, dense molecular clouds, and stellar-mass black holes within our Galaxy. It is even quite possible that entirely new phenomena could account for some portion of these unidentified sources. GLAST will localize the positions of the uni dentified sources accurately enough to make searches for counterparts at other wavelengths much more feasible.
  Glast Category: ASTRONOMY, operations
Uninterruptible Power Supply
See UPS.
Universities Research Association
See URA.
UNIX
A computer operating system developed by AT&T. It is available on a wide variety of computing platforms. It is noted for its portability and interactive software tools.
Unix to Unix Copy Program
See UUCP.
UNP
Unbounded Nano Particle.
Unsaturated Zone
A subsurface zone containing water under pressure less than that of the atmosphere, including water held by capillarity, and containing airs or gases generally under atmospheric pressure. It is limited above by the land surface and below by the water table. Synonym: Vadose Zone.
UO
Users Organization.
UOEC
Users Organization Executive Committee.
UOR
Unusual Occurrence Report.
UPK
User Productivity Kit. (PeopleSoft).
Upper Explosive Limit
See UEL.
Upper Flammable Limit
See UEL.
UPS
Uninterruptible Power Supply. An emergency power supply used in PPS systems where power must not be interrupted for safety reasons. Consists of a large bank of batteries and control circuitry.
UPSTR
UPSTReam
URA
Universities Research Association. The governing body for Fermilab and the former SSC.
URA
User Research Administration (SSRL, LCLS)
URI
Uniform Resource Identifier. The generic term for all types of names and addresses that refer to objects on the World Wide Web. A URL is one kind of URI.
URL
Uniform Resource Locator. Standardized formatted entities within hyper-text documents which specify a network service or document to establish a link.
URQMD
UltraRelativistic Quantum Molecualr Dynamic.
USA
Unconventional Stellar Aspect satellite experiment.(Group K)
USAXS
Ultra Small-Angle X-ray Scattering.
USC
Ultrafast Science Center (SLAC)
USCG
United States Coast Guard.
USDA
United States Department of Agriculture.
USDW
Underground Source of Drinking Water.
USGBC
U.S. Green Building Council.
USGS
United States Geological Survey.
USI
Unreviewed Safety Issue.
USLCSG
United States Linear Collider Steering Group.
USN
United States Navy.
USPAS
United States Particle Accelerator School. A twice-yearly school that rotates among research universities throughout the U.S. and draws faculty from a variety of institutions to teach intensive courses on beam science and technology.
USPCI
U. S. Pollution Control, Inc.
USPHS
United States Public Health Service.
USR
Ultimate Storage Ring.(proposed) A light source designed to produc e brighter X-ray beams than the current synchrotrons can offer.
USSKA
United States Square Kilometer Array Consortium.
UST
Underground Storage Tank.
USTC
University of Science and Technology of China.
USW
United Stanford Workers.
UT
Upper Transformer
UTC
| A high-precision atomic time standard (also known Greenwich Mean Time, or as Zulu time) with 24-hour days conventionally identified using the Gregorian calendar, though Julian Day Numbers can also be used. Each hour contains 60| | minutes, but the number of seconds in a minute can vary slightly. A normal UTC day contains exactly 86,400 seconds, with exactly 60 seconds in each minute. However, the mean solar day is slightly longer than 86,400 seconds, resulting in t| | he occasional inclusion of a leap second in the last minute of a UTC day, giving it 61 seconds to account for the extra length of about 2 milliseconds in each of all the mean solar days since the previous leap second. (These irregular day | | lengths mean that fractional Julian days do not work properly with UTC.) Time zones around the world are expressed as positive or negative offsets from UTC.|
  Glast Category: astronomy, operations, SAS
UTEP
University of Texas at El Paso. (SSRL Gateway Partner)
UTIC
Universal Time Interval Counter.
UTR
University Technical Representative.
UTS
Ultramedia Tools Series. OS/2, Windows, and DOS multimedia software products for authoring, graphics, audio, animation, and video that share common file formats and a similar user interface.
UUCP
Unix to Unix Copy Protocol. A protocol used for copying files between consenting UNIX systems, and for handling e-mail. Mostly superseded, but still used in low budget situations.
UV
UltraViolet
UX
User eXperience.

Send corrections to jmdeken@slac.stanford.edu or propose new terms for SLACspeak.

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