The principles and techniques of primary refractive-index gas thermometry (RIGT) are
reviewed. Absolute primary RIGT using microwave measurements of helium-filled quasi …

Nanometer-sized structures, surfaces and sub-surface phenomena have played an
enormous role in science and technological applications and represent a driving-force of …

Recent advances regarding the interplay between ab initio calculations and metrology are
reviewed, with particular emphasis on gas-based techniques used for temperature and …

Abstract Typically, Feature Selection (FS) is adopted as a critical preprocessing step in most
pattern recognition and data mining tasks. It helps to avoid the acute impact of irrelevant and …

Optical pressure measurement systems can precisely measure pressure from vacuum to
high pressure with a single apparatus. However, the continuously measurable range without …

With dielectric-constant gas thermometry, the molar polarizability of helium, neon, and argon
has been determined with relative standard uncertainties of about 2 parts per million. A …

The redefinition of the kelvin has increased focus on thermometry techniques that use the
newly fixed value of the Boltzmann constant to realize thermodynamic temperature. One …

The QED contribution to the dipole polarizability of the He 4 atom was computed, including
the effect of finite nuclear mass. The computationally most challenging contribution of the …

By measuring the refractivity and the temperature of a gas, its pressure can be calculated
from fundamental principles. The most sensitive instruments are currently based on Fabry …

Laser refractometers are approaching accuracy levels where gas pressures in the range 1
Pa< p< 1 MPa inferred by measurements of gas refractivity at a known temperature will be …