Uncertainty(不确定度)一共有三种,分别是absolute uncertainty,fractional uncertainty和percentage uncertainty。 通常说uncertainty指的是absolute uncertainty。而fractional uncertainty和percentage uncertainty实际上是同种uncertainty的两种不同表示方法,只是fractional uncertainty最终结...
uncertainty as low as 1.2 kHz (6 × 10−12in fractional terms). In fact, by ranking with the highest accuracy levels obtained so far with deep-rooted methodologies involving room-temperature cell samples, either in the Doppler-limited33,34or Doppler-free regime35,36,37,38,39,40, our...
The uncertainty of the realization of the frequency of the UTC(AOS), i.e. the difference UTC - UTC(AOS), is estimated by comparing the UTC(AOS) and UTC(PTB) by the Two Way Satellite Frequency and Time Transfer (TWSTFT) and by the proprietary GNSS time transfer system (TTS-4). The ...
After the correction of systematic shifts, the clock transition frequency f_Ca+ = 411 042 129 776 393.2 (1.0) Hz is obtained, which corresponds to a fractional uncertainty within a factor of three of the Cs standard. Future improvements are expected to lead to an uncertainty surpassing the ...
摘要: We consider the problem of stabilizing a class of uncertain discrete-time systems in which the uncertainty satisfies a certain sum constraint. We cons…关键词: Uncertain systems robust control control absolute stability DOI: 10.1016/0005-1098(95)00029-V ...
The absolute frequency of the S0-P0 clock transition of Sr has been measured to be 429 228 004 229 873.65 (37) Hz using lattice-confined atoms, where the fractional uncertainty of 8.6 * 10represents one of the most accurate measurements of an atomic transition frequency to date. After a ...
Volitility measures reflect the uncertainty or risk of change in a security`s value. Standard Deviation 7.005 Mean 0.352 Sharpe Ratio 0.29 SEE MORE GARUX RISK Updated 10/31/23 Previous: Risk Next: Interactive Chart Quotes delayed at least 15 minutes. Market data provided by Xignite. Fund data...
One can simply take a sample and measure it on the balance, but with an adsorbent one has to consider that air will adsorb on the sample and if the material is hydrophilic the uncertainty in the sample mass may not be negligible. The standard approach in our laboratory is to use the ...
We performed an absolute frequency measurement of the $^1S_{0}$-$^3P_{0}$ transition in $^{87}$Sr with a fractional uncertainty of $1.2 \times 10^{-15}$, w... T Tanabe,D Akamatsu,T Kobayashi,... - 《Journal of the Physical Society of Japan》 被引量: 15发表: 2015年 Method...
A single, free-running, dual-wavelength mode-locked, erbium-doped fibre laser was exploited to measure the absolute frequency of continuous-wave terahertz (CW-THz) radiation in real time using dual THz combs of photo-carriers (dual PC-THz combs). Two independent mode-locked laser beams with ...