form factor


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form factor

[′fȯrm ‚fak·tər]
(electricity)
The ratio of the effective value of a periodic function, such as an alternating current, to its average absolute value.
A factor that takes the shape of a coil into account when computing its inductance. Also known as shape factor.
(mechanics)
The theoretical stress concentration factor for a given shape, for a perfectly elastic material.
(physics)
A function which describes the internal structure of a particle, allowing calculations to be made even though the structure is unknown.
(quantum mechanics)
An expression used in studying the scattering of electrons or radiation from atoms, nuclei, or elementary particles, which gives the deviation from point particle scattering due to the distribution of charge and current in the target.

Form Factor

 

a function that characterizes the distribution of the electric charge or magnetic moment within some microsystem, such as an atom or atomic nucleus, or within an elementary particle. The form factor of an atom is determined by the distribution of atomic electrons; the form factor of a nucleus is determined primarily by the distribution of nucleons (protons and neutrons) within the nucleus. In the latter case, virtual mesons also contribute to the form factor; they are the basis for the nucleon exchange that gives rise to nuclear forces. The existence of a form factor has also been established for strongly interacting elementary particles—hadrons, such as nucleons and pions. Experiments on the elastic scattering of high-energy electrons and muons by hadrons lead to the conclusion that the size of the region over which the electric charges and magnetic moments of the hadrons are distributed is of the order of 10–13 cm. These data directly attest to the complex structure of hadrons. At the same time, experiments indicate that the maximum range at which the charge of an electron or muon is appreciable does not exceed 10–15cm.

The form factor of hadrons that characterizes the dimensions of hadrons in processes involving the weak interaction is postulated by analogy with form factors characterizing the distribution of magnetic moment.

S. S. GERSHTEIN

form factor

(hardware)
The type of packaging of a processor integrated circuit, e.g. PPGA, FC-PGA.

More generally, a term popular among marketroids in 1998, denoting the shape of something designed.

form factor

The physical size of a device as measured by outside dimensions. With regard to a disk drive, the form factor is the diameter of the platters, such as 2.5", 3.5" and 5.25", not size in terms of storage capacity. See footprint.
References in periodicals archive ?
Most servers will see an increase the number of drives from 50% to 100% when they adopt the small form factor.
Through its code compatibility with the C64x family of devices, the TCI6482 can also help to reduce the development and design costs associated with expanding an OEM's infrastructure product line to support multiple standards and form factors.
The current interface for small form factor is CF+, a 50-pin interconnect that features parallel ATA in a confined space.
Design engineers in the embedded market are developing increasingly complex designs within small form factors," said Erik Salo, AMD's director of marketing for the Personal Connectivity Solutions Group.
The C8051F360 Small Form Factor MCU family is available now with pricing beginning at $2.
We are seeing an increased adoption of small form factor desktops in settings such as healthcare, education, financial institutions and call-centers," said Tom Tobul, executive director, desktop marketing, Lenovo.
OEMs can, however, capture market share by shipping the right Fibre Channel support in the right form factor to the right customers for the targeted market.
This new form factor opens portable, handheld, avionic and other space and weight constrained applications to the high reliability, repeatability and rugged designs of Hypertronics.
The FTRJ1621 is available in the pluggable SFP form factor, which includes an internally powered APD receiver as well as Finisar's "bail" latching mechanism.
To help meet this need, AMD is taking the initiative to define an open standard for small form factor designs.
The recent introduction of a 1-inch form factor may point the way to future configurations of the disk drives though these presently remain confined to the entertainment sector of the storage industry.