Term 术语 Definition 定义
enhanced group call (EGC)
强化群呼
The system for broadcasting messages via the mobile satellite communications system operated by Inmarsat. EGC is a part of the INMARSAT-C s... more
The system for broadcasting messages via the mobile satellite communications system operated by Inmarsat. EGC is a part of the INMARSAT-C system.
通过由INMARSAT运营的移动卫星通信系统播发消息的系统。EGC是INMARSAT-C系统的一部分。
entrance
入口
The SEAWARD end of a CHANNEL, HARBOUR, DOCK, etc.
海峡、港口、船坞等向海一侧的终端部分。
entrance pupil
入射光瞳
The IMAGE of the APERTURE STOP formed by all the LENS ELEMENTS on the object side of the APERTURE STOP.
孔径光阑被它前面(物方)的光学系统所成的像。
entrance window
入射窗
The IMAGE of the FIELD STOP formed by all the LENS ELEMENTS on the object side of the FIELD STOP.
视场光阑被它前面(物方)的光学系统所成的像。
envelope
包络线,包络面
In electronics, a graph defining the variations in AMPLITUDE of successive OSCILLATIONS in an amplitude-modulated wave.
在电子学领域,定义调幅波振幅连续波动变化的图形。
envelope edge
包络边界
The fore part of an ENVELOPE.
包络线的前面部分。
environment
环境
The sum total of all external conditions which may affect an organism, community, material, or energy if brought under the influence of thes... more
The sum total of all external conditions which may affect an organism, community, material, or energy if brought under the influence of these external conditions.
所有的外部条件的总和,如果生物、群落或者能量置于这些外部条件中,会对它们产生影响。
Environmentally Sensitive Sea Area (ESSA)
环境敏感海域
 A generic term which is used to describe a wide range of areas, considered sensitive for a variety of environmental reasons.
用来描述对各种环境因素敏感的广阔海域的通用术语。
Eotvos balance
厄特沃什扭秤
See TORSION BALANCE.
见torsion balance(扭秤)。
Eotvos correction
厄特沃什改正
A correction applied to gravity measurements to balance the effect of the vertical force experienced by a body moving in an east-west direct... more
A correction applied to gravity measurements to balance the effect of the vertical force experienced by a body moving in an east-west direction on the rotating earth.
一种用于重力测量的改正,用于补偿物体在旋转的地球上沿东西方向运动所受的垂直力的影响。
Eotvos effect
厄特沃什效应
The east-west component of the movement of a ship, including the effect of marine currents, modifies the centrifugal force of the earth's ro... more
The east-west component of the movement of a ship, including the effect of marine currents, modifies the centrifugal force of the earth's rotation. It is a vertical force experienced by a body moving in an east-west direction on the rotating earth.
船只运动的东西分量(包括海流影响)使地球自转的离心力发生变化。亦即物体在旋转的地球上按东西方... more
船只运动的东西分量(包括海流影响)使地球自转的离心力发生变化。亦即物体在旋转的地球上按东西方向运动时将受到垂直力的影响,此种影响称之为厄特沃什效应。
epact (of the year)
岁首月龄;闰余
The AGE OF THE MOON at 00 HOUR on January 1.
一月一日零时的月龄。
ephemeris
星历表,天文历书
A statement presenting POSITIONS and related DATA for a CELESTIAL BODY for given EPOCHS (dates) at uniform intervals of time. Also a publica... more
A statement presenting POSITIONS and related DATA for a CELESTIAL BODY for given EPOCHS (dates) at uniform intervals of time. Also a publication containing such DATA for a number of CELESTIAL BODIES. See also ALMANAC: AIR and ALMANAC: NAUTICAL.
在一定时期内按照一致的时间间隔记载天体位置和相关参数的表册。也指包含天体位置和参数的出版物。... more
在一定时期内按照一致的时间间隔记载天体位置和相关参数的表册。也指包含天体位置和参数的出版物。亦可参见air almanac (航空天文历)和nautical almanac(航海天文历)。
epicentre (or epicenter, epicentrum)
震中
The point of the EARTH's surface directly above the FOCUS of an EARTHQUAKE.
位于震源正上方地球表面的点。
epipolar plane
核面
Any plane which contains the EPIPOLES; therefore any plane containing the AIR BASE. Also called basal plane.
包含核点的任意平面;因此也就是包含摄影基线的任何平面。也称为basal plane(基线平面,基面)。
epipolar ray
核线
The line on the plane of a PHOTOGRAPH joining the EPIPOLE and the IMAGE of an object. Also expressed as the trace of an EPIPOLAR PLANE on a ... more
The line on the plane of a PHOTOGRAPH joining the EPIPOLE and the IMAGE of an object. Also expressed as the trace of an EPIPOLAR PLANE on a PHOTOGRAPH.
在像平面上连接核点和地面任一物体像点的直线。也可表述为核面与像平面的交线。
epipoles
核点
In the perspective set-up of two PHOTOGRAPHS, (two perspective projections), the points on the planes of the PHOTOGRAPHS where they are cut ... more
In the perspective set-up of two PHOTOGRAPHS, (two perspective projections), the points on the planes of the PHOTOGRAPHS where they are cut by the AIR BASE.
在两张照片建立的透视中(两个透视投影),摄影基线与像平面的交点。
epoch
时期;时代;纪元
A given period of time during which a series of related acts or events takes place. In ASTRONOMY, a particular instant for which certain DAT... more
A given period of time during which a series of related acts or events takes place. In ASTRONOMY, a particular instant for which certain DATA are given or at which an OBSERVATION is made, and which then is usable as a REFERENCE POINT.
一定的时间段,在此时间段里发生了一系列的事件。 在天文学,指给定了某些数据的或者实施某一观测的... more
一定的时间段,在此时间段里发生了一系列的事件。 在天文学,指给定了某些数据的或者实施某一观测的特定时刻,该时刻用作参考点。
equal altitudes
等高度
Two ALTITUDES of the same CELESTIAL BODY observed east and then west of the MERIDIAN, when it has reached the same value. The expression als... more
Two ALTITUDES of the same CELESTIAL BODY observed east and then west of the MERIDIAN, when it has reached the same value. The expression also applies to the practice, essentially obsolete, of determining the instant of local APPARENT NOON by observing equal ALTITUDES of the SUN.
对于同一天体,当它处在观测子午线以东和以西时两次观测其高度均相等,这样所测得相等值的两高度称... more
对于同一天体,当它处在观测子午线以东和以西时两次观测其高度均相等,这样所测得相等值的两高度称为等高度。等高度也用于通过观测太阳的等高度确定地方视正午的过程中,实际上此方法已废弃。
equal area projection
等面积投影
See PROJECTION.
投影前后面积保持不变的投影。此投影不是等角投影,不用于船舶航行中。也称为equivalent projection(等积... more
投影前后面积保持不变的投影。此投影不是等角投影,不用于船舶航行中。也称为equivalent projection(等积投影)。