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floating ice | 浮冰
| Any form of ICE found floating in water. | 浮在水面上的各种形状的冰。 |
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floating mark | 立标、浮标、浮动测标
| In PHOTOGRAMMETRY, a mark seen as occupying a position in the three-dimensional space formed by the STEREOSCOPIC FUSION of a pair of PHOTO... more | 在摄影测量中，像对立体融合而形成的对应三维空间中某一位置的标志，它用作检查或者测量立体模型的参考标志。 |
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floating point | 浮点
| In computer systems the type of numeric data approximately representing real numbers. A floating point number is composed of an exponent an... more | 在计算机系统，一种可以近似表示实际数据的数字数据类型。浮点数是由一个指数和一个确定相对于该指数的数值的尾数构成。由于计算机的字长有限，因此浮点表示可能引起精度损失。 |
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floating triangulation | 水上三角测量
| See TRIANGULATION. | 在海道测量中，当测量区域距离陆地较远以致于岸上标志不能直接用来进行水深定位时而采用的锚定浮标方式实施的三角测量。水上三角测量既可以岸上三角点连接，是岸上三角测量的延伸，也可完全在海上通过在海上观测和测量确定浮标的位置。浮标固定在可构成该区域测量网的位置上。 |
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float-off | 揭板
| (British terminology). The paper of a FIELD BOARD when detached from the board on completion of the work for which the FIELD BOARD was prep... more | 当完成测量工作时将从外业图板上取下的外业图纸的过程。 |
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float well | 验潮井
| A vertical pipe or box with a relatively small opening in the bottom, used to enclose the float of a tide gauge so the float will be little ... more | 一种垂直的管道或者盒子，在底部有一个相对较小的开口，用来装入验潮仪的浮子，这样浮子受水的非潮汐运动影响很小。和stilling well（静水井）为同义词。 |
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floe (or ice floe) | 浮冰
| A piece of SEA ICE other than FAST ICE. Floes over 10 km across are described as vast; those between 1 and 10 km across as big; those betwee... more | 固定冰以外的海上冰块。长度在10公里以上的浮冰，称为巨型浮冰；1公里-10公里之间的，称为大浮冰块；200米-1000米之间的，称为中型浮冰块；10-200米之间的，称为小浮冰块。10米以下称为聚积冰块。 |
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flood | 涨潮流、涨潮；洪水
| The FLOOD STREAM. Sometimes the term 'flood' is also used with reference to vertical tidal movement. The opposite is EBB. An overflowing of ... more | 涨潮流。有时该术语也与潮汐垂直运动基准一同使用。反义词是ebb（落潮）。在通常干旱的陆地上发生的雨水泛滥，称为洪水。 |
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flood current | 涨潮流
| See FLOOD STREAM. | 参见flood stream（涨潮流）。 |
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flood stream | 涨潮流
| The horizontal movement of water associated with the RISING TIDE. Flood streams generally set toward the SHORE, or in the direction of the... more | 涨潮时海水的水平运动。涨潮流一般流向海边或者沿着涨潮方向。亦称为flood，flood current或者ingoing stream（涨潮流）。 |
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flood tide | 涨潮
| See TIDE: RISING. | 参见rising tide（涨潮）。 |
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flotsam | 浮货，遇难船只漂浮的货物
| See JETTISON. | 参见jettison（抛弃货物）。 |
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flow | 流，流动
| The motion characteristic of a fluid. | 液体的运动特性。 |
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flume | 槽沟，水槽
| An inclined CHANNEL for conveying water from a distance to be utilized for power, transportation, irrigation, etc. | 为了获得动力、运输、灌溉等，从远处引水而使用的倾斜水道。 |
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fluorescence | 荧光
| Emission of light or other RADIANT ENERGY as a result of and only during absorption of RADIATION from some other source. See LUMINESCENCE an... more | 某些物质吸收其它来源的辐射能时所发出的可见光或者其它辐射能。 |
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flux: luminous | 光通量
| Quantity, characteristic of RADIANT FLUX which expresses its capacity to produce a luminous sensation. | 表示产生感光能力的辐射通量的数值与特性。 |
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flux: radiant | 辐射通量
| Power emitted, transferred or received in the form of RADIATION. | 以辐射形式发射、转换或者接收的功率。 |
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flux-gate magnetometer | 磁通门式磁力仪
| See MAGNETOMETER. | 一种使用金属丝缠绕而成的自饱和感应线圈的设备，用来测量地球的磁场。 |
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f-number | 光圈数，焦距比数
| See APERTURE: RELATIVE. | 参见relative aperture（相对孔径）。 |
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foam line | 碎浪线，泡沫线
| The front of a WAVE as it advances shoreward, after it has broken. | 波浪向海岸运动变成破碎浪时的界限。 |