| slovo | definícia |
b3
(encz) | B3,Blah, Blah, Blah [zkr.] |
| | podobné slovo | definícia |
Pb3O4
(gcide) | massicot \mas"si*cot\, n. [F. massicot; E. masticot is a
corruption.] (Chem.)
Lead monoxide (also called Lead protoxide), PbO, obtained
as a yellow amorphous powder, the fused and crystalline form
of which is called litharge; lead ocher. It is used as a
pigment. It is also called lead oxide yellow, as opposed to
red lead, which is lead tetroxide Pb3O4.
[1913 Webster +PJC]
Note: Massicot is sometimes used by painters, and also as a
drier in the composition of ointments and plasters.
[1913 Webster]minium \min"i*um\ (?; 277), n. [L. minium, an Iberian word, the
Romans getting all their cinnabar from Spain; cf. Basque
armine['a].] (Chem.)
A heavy, brilliant red pigment, consisting of an oxide of
lead, Pb3O4, obtained by exposing lead or massicot to a
gentle and continued heat in the air. It is used as a cement,
as a paint, and in the manufacture of flint glass. Called
also red lead, lead tetroxide, lead orthoplumbate,
mineral orange, mineral red, Paris red, Saturn red,
and less definitively, lead oxide.
[1913 Webster] |
vitamin B3
(gcide) | niacinamide \niacinamide\ n.
The amide of niacin (nicotinic acid), called also
nicotinamide. It was at one time called vitamin B3, and
can function to relieve nicotinic acid deficiency. Chemical
formula C6H6N2O, chemically it is 3-pyridinecarboxamide.
Syn: nicotinic acid amide, nicotinamide.
[PJC]vitamin B3 \vitamin B3\ n.
See nicotinamide.
Syn: nicotinamide.
[PJC] |
b3 security
(foldoc) | Orange Book
A1 security
B1 security
B2 security
B3 security
C1 security
C2 security
A standard from the US Government
National Computer Security Council (an arm of the
U.S. National Security Agency), "Trusted Computer System
Evaluation Criteria, DOD standard 5200.28-STD, December 1985"
which defines criteria for trusted computer products. There
are four levels, A, B, C, and D. Each level adds more
features and requirements.
D is a non-secure system.
C1 requires user log-on, but allows group ID.
C2 requires individual log-on with password and an audit
mechanism. (Most Unix implementations are roughly C1, and
can be upgraded to about C2 without excessive pain).
Levels B and A provide mandatory control. Access is based on
standard Department of Defense clearances.
B1 requires DOD clearance levels.
B2 guarantees the path between the user and the security
system and provides assurances that the system can be tested
and clearances cannot be downgraded.
B3 requires that the system is characterised by a mathematical
model that must be viable.
A1 requires a system characterized by a mathematical model
that can be proven.
See also crayola books, book titles.
[Jargon File]
(1997-01-09)
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hdb3
(vera) | HDB3
High Density Bipolar 3
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