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, chemical symbol
Si, symbol for the element silicon.


, abbreviation for the International System of Units
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McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

International System of Units (SI)

A system of units based on the following fundamental quantities: metre, kilogram, second, ampere, kelvin, candela, and mole.


McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.


, Hsi, Si
a river in S China, rising in Y?nnan province and flowing east to the Canton delta on the South China Sea: the main river system of S China. Length: about 1900 km (1200 miles)
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005


Syst?me International.




The country code for Slovenia.
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SI units

(Système International d'Unites; International System of Units) A system of standard units of measurement finalized at the 14th General Conference on Weights and Measures in 1971. It is based on seven units of measure, including three from the MKS system (meter-kilogram-second), the ampere for electrical current, the Kelvin for temperature, the candela for luminosity and the mole for molecular weight. See MKS system, amp, Kelvin, candela and mole.

BASIC SI UNITS Quantity        Unit of Measurement

 length (l)      meter (m)
 mass (m)        kilogram (kg)
 time (t)        second (s)
 current (I)     ampere (A)
 temperature     kelvin (K)
 atomic weight   mole (mol)
 luminosity      candela (cd) 

 DERIVED SI UNITS Quantity             Unit of Measurement

 force (f)            newton (N)
 work (W)             joule (J)
 power (P)            watt (W)
 pressure (P)         pascal (pa)
 frequency (f)        Hertz (Hz)
 electric charge (Q)  coulomb (C)
 potential (V)        volt (V)
 capacitance (C)      Farad (F)
 resistance (R)       ohm


(Si) The base material used in chips. Pronounced "sil-i-kin," not "sil-i-cone," the latter used to make sealants (see silicone), silicon is the most abundant element in nature next to oxygen. It is found in a natural state in rocks and sand, and its atomic structure makes it an ideal semiconductor material. For chip making, silicon is mined from white quartz rocks and put through a chemical process at high temperatures to purify it. Pure silicon is not electrically conductive. In order to make it conductive, it is chemically combined with other materials such as boron and phosphorus (see doping). See silicon germanium and black silicon.

A Silicon Moon
This stylized image symbolizes that chips are made from the same material found in sand. The "moon" is a finished wafer containing memory chips. (Image courtesy of Texas Instruments, Inc.)

Drawing the Silicon Ingot
An ingot is being drawn from a furnace containing molten silicon. High-speed saws slice the ingots into wafers about the thickness of a dime, which are then ground and polished mirror smooth. (Image courtesy of Texas Instruments, Inc.)

systems integrator

An individual or organization that builds systems from a variety of diverse components. With increasing complexity of technology, more customers want complete solutions to information problems, requiring hardware, software and networking expertise in a multivendor environment.

Some of the major systems integrators are Accenture (formerly Andersen Consulting), Price Waterhouse, Computer Sciences Corporation, IBM Global Services, HP, Ernst & Young, EDS and Deloitte Consulting. See OEM, VAR and NASI.
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References in periodicals archive ?
The judge also said on the Selangor fatwa applies to SIS Forum (Malaysia) even if it was a company.
He added: "It is clear and, in our view, beyond any reasonable dispute that Ladbrokes, Coral and Betfred were only able to not enter into media rights agreements with TRP, on proper commercial terms [between January 1 and late July 2017], because of their access to raceday data unlawfully supplied by SIS, and it follows that SIS is responsible for the very significant damages to which TRP is entitled.
For the 63 cases whose pathology results were endometrial polyps, H/S found masses in endometrial cavity in 63 cases (100%), and SIS found them in 60 cases (95,2%).
Founded in 1978, AvA"sis has been providing essential ancillary benefit solutions for over 35 years.
With its license of the MIPS32 1074K(TM) CPS, SiS will be able to leverage a new level of performance for its next-generation designs.
Kaeser said making SIS independent would give it more options, but when asked by reporters, he refused to give details or be pinned down on the timing of a decision on the future for SIS.
After months of wrangling, a high powered government committee decided to award the rights to SIS, which has been in the production business for over two decades.
Available in print and electronic formats, SIS consists of an eight-page interview and profile form that tests support needs in 87 areas, and a 128-page User's Manual.
"'SIS people were speaking with SWAT, who transitioned to our guns in 2002 and have been very satisfied, have in fact reordered twice since then," Dwight related to American Handgunner.
The Danish furniture group SIS international A/S said on Tuesday (14 March) that its subsidiary SIS working A/S has divested its product line Dana Difference to Holmris Hansen A/S.