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The absolute measurement of the mass, as well as the determination of the Planck constant, has become one of the most important issues in metrology toward a new kilogram definition based on fundamental constant. A method for measuring the inertial mass, being different from the gravitational mass measurement by either a watt balance or the Avogadro project has been carried out recently at National...
The Joule balance method to measure the Planck constant and redefine the Kilogram ultimately has been going on at the National Institute of Metrology of China (NIM) since 2007. The first prototype has been built to check the feasibility of the principle. In 2012, the relative uncertainty of the plank constant measurement result is at 10−5 level. Self-heating of the coils, swing of the coil, etc.,...
We present measurements of higher-order modes in lengths of few-moded fibers up to 0.5 km long using Spatially and Spectrally resolved (S2) imaging. Both discrete scattering events and mode-mixing due to distributed scattering are measured.
We combined experimental terahertz time-domain spectroscopy (THz-TDS) and ab-initio simulation based on density functional theory to predict with a large confidence the THz vibration spectrum of molecules in the crystalline phase. The results demonstrate two kinds of vibration modes. One is a pure inter-molecular hydrogen bonding vibration mode, and the other is dominated by inter-molecular and intramolecular...
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