原子钟

The Absolute frequency measurement is performed with the help of a femtosecond laser referenced to a commercial cesium atomic clock.

用一台以商用铯原子钟为基准的飞秒光频梳作为测量工具，对其频率进行了20次的精密测量，相对不确定度为5.0×10^(-14)。

Finally discussed the conception of the connatural time and observation time, and take example for atomic clock and pulse laser Doppler speedometer, particular analysed problem of antipathic between 'formula of time slow' and formula of Doppler of light, and try to explained some dark understand about this problem before .

最后从固有时间和观测时间的概念入手，以铯原子钟和激光脉冲多普勒测速仪为例，详细分析了"时慢公式"与光多普勒定律之间的不相容问题，并尝试解释了以前对此问题的一些模糊认识。

Over the years, the time expressed by atomic clocks has diverged slightly from that determined by the astronomic approach.

有许多年，由原子钟计算出来的时间与由天文学方法确定的时间产生了一些微小的差别。

The adjustment will be carried out by sticking to an extra second into atomic clock at the stroke of midnight.

据美国国家标准与技术协会介绍，全世界的原子钟都将在协调世界时2005年12月31日午夜加上一个闰秒。

According to the power model of atomic clock, a new model of atomic clock noize of time-frequency domain and it's algorithm is presented preliminary.

本文借鉴原子钟噪声的幂率谱模型，初步提出一种时-频域原子钟的噪声模型及相应的计算方法。

Atomic clocks rely on regular oscillations of caesium atoms to keep time and are extremely accurate.

原子钟依靠铯原子的均匀振动记录时间，故而十分准确。

In a caesium clock, the optimum frequency corresponds to 9,192,631,770 oscillations of the microwave per second (just over 9 GHz in frequency), so dividing the output electronically by this number provides one-second 'ticks' of the atomic clock.

对于铯原子钟，其最佳频率是微波每秒振动9，192，631，770次(频率略高于9 GHz)，而用电路把输出的信号除以这个数字就提供了原子钟的一声"滴答"。

The Hong Kong Time Standard is provided by a caesium beam atomicclock. Accuracy within fractions of a microsecond a day is maintained.

天文台利用铯原子钟，提供香港的时间标准，该钟误差每日不超过一微秒。

The modem spectral estimate and higher order spectral analysis are utilized to estimate the spectrum of the atom clock data respectively, and the noise characteristic is analysed by fitting to the spectrum of the atom clock.

利用现代谱估计法和高阶谱法分别估计原子钟数据的功率谱，并对功率谱进行拟合，可分析原子钟的噪声特性。

With the analysis of ADEV and HDEV for NTSC s more than 20 atomic clocks as well as the BIPM publications of rate and weight,the usability of a clock in high precision time keeping is discussed.

该文根据NTSC 20多台原子钟的ADEV和HDEV的分析、BIPM发表的TAI系统中原子钟的速率公报和权重报告，讨论了在高精度守时系统中对原子钟频率稳定度的要求。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。