phases 音标拼音: [f'ezəz] [f'ezɪz]
n . 时期,局面,阶段
v . 逐步实行
时期,局面,阶段逐步实行
Phase \
Phase \ (
f [=
a ]
z ),
n .;
pl . {
Phases } (
f [=
a ]
z "[
e ^]
z ). [
NL .
phasis ,
Gr .
fa `
sis ,
fr .
fai `
nein to make to appear :
cf .
F .
phase .
See {
Phenomenon }, {
Phantom },
and {
Emphasis }.]
1 .
That which is exhibited to the eye ;
the appearance which anything manifests ,
especially any one among different and varying appearances of the same object .
[
1913 Webster ]
2 .
Any appearance or aspect of an object of mental apprehension or view ;
as ,
the problem has many phases .
[
1913 Webster ]
3 . (
Astron .)
A particular appearance or state in a regularly recurring cycle of changes with respect to quantity of illumination or form of enlightened disk ;
as ,
the phases of the moon or planets .
See Illust .
under {
Moon }.
[
1913 Webster ]
4 . (
Physics )
Any one point or portion in a recurring series of changes ,
as in the changes of motion of one of the particles constituting a wave or vibration ;
one portion of a series of such changes ,
in distinction from a contrasted portion ,
as the portion on one side of a position of equilibrium ,
in contrast with that on the opposite side .
[
1913 Webster ]
5 . (
Phys .
Chem .)
A homogenous ,
physically distinct portion of matter in a system not homogeneous ;
as ,
the three phases ,
ice ,
water ,
and aqueous vapor ;
in a mixture of gasoline and water ,
the gasoline will settle as the upper phase .
A phase may be either a single chemical substance or a mixture ,
as of gases .
[
Webster 1913 Suppl .]
6 . (
Zool .)
In certain birds and mammals ,
one of two or more color variations characteristic of the species ,
but independent of the ordinary seasonal and sexual differences ,
and often also of age .
Some of the herons which appear in white and colored phases ,
and certain squirrels which are sometimes uniformly blackish instead of the usual coloration ,
furnish examples .
Color phases occur also in other animals ,
notably in butterflies .
[
Webster 1913 Suppl .]
7 . (
Physics )
the relation at any instant of any cyclically varying physical quantity ,
such as voltage in an A .
C .
circuit ,
an electromagnetic wave ,
a sound wave ,
or a rotating object ,
to its initial value as expressed as a fractional part of the complete cycle .
It is usually expressed in angular measure ,
the complete cycle being 360 [
deg ].
Such periodic variations are generally well represented by sine curves ;
and phase relations are shown by the relative positions of the crests and hollows of such curves .
Magnitudes which have the same phase are said to be in phase .
Note :
The concept of phase is also applied generally to any periodically varying phenomenon ,
as the cycle of daylight .
One person who sleeps during the day and another who sleeps at night may be said to be out of phase with each other .
[
PJC ]
8 .
Specifically : (
Elec .)
The relation at any instant of a periodically varying electric magnitude ,
as electro -
motive force ,
a current ,
etc .,
to its initial value as expressed in factorial parts of the complete cycle .
It is usually expressed in angular measure ,
the cycle being four right angles ,
or 360 [
deg ].
[
Webster 1913 Suppl .]
Phasis \
Pha "
sis \,
n .;
pl . {
Phases }. [
NL .]
See {
Phase }. --
Creech .
[
1913 Webster ]
Phasm
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